Method of liquid ejection (versions)

FIELD: printing industry.

SUBSTANCE: invention relates to method for liquid ejection to eject liquid from ejection channel by application of energy to liquid. Method includes the following stages: liquid is put in motion along ejection channel, which comprises, in cross section, relative to direction of ejection, two ledges inside the channel, then liquid surface that is arranged on both sides of two ledges and in area between two ledges in channel in direction opposite to direction of liquid ejection is pulled so that liquid arranged in specified area is joined to liquid in the form of column and is in contact with distal ends of two ledges, and them liquid in the form of column is separated from liquid arranged in specified area to eject liquid from ejection channel, so that liquid arranged in specified area is in contact with distal ends of two ledges.

EFFECT: invention makes it possible to reduce formation of satellites (secondary drops) and to accordingly improve quality of printing.

6 cl, 37 dwg

 

The technical field to which the invention relates

The present invention relates to a method of ejection of the liquid.

Prior art

As a system to eject the liquid, such as ink, developed system of ejection of the liquid system (ink jet printing), and as an element that generates energy throwing that is used to eject the liquid droplets, a technique which provides for the use of the heat-generating element (heater).

Figure 10 presents a schematic diagram illustrating a conventional process of ejection system for carrying out a bubble-jet (PS) throwing, which is the normal head inkjet printing, to prevent the message bubbles to the atmosphere. It should be noted that for convenience, in this case, part of the liquid ejected out through the nozzle plate in which is formed the channel dispersion, called the ejectable liquid, and the liquid remaining inside the ejection channel, called the flowing fluid, to describe the difference between these two parts liquid.

First of all, condition (a) according to Figure 1 is called the phenomenon of film boiling on the surface of the heater due to the supply of power to the heater (step (b) according to Figure 1). Due to e is ergie, produced through this film boiling, the liquid is pumped into the outer space from the surface to allow the plate in which is formed a channel ejection (step (C) according to Figure 1). At this point, driven by the force of inertia due to energy generated by film boiling, the liquid located near the heater, moves in the form of a bubble, away from the heater. Because the state of the surface section of the bubble and the liquid is changed by this movement of the liquid, gas, located near the heater, behaves as if he were expanded. However, the condition at this point is that not tested the influence of the heat produced by the heater, and this heat is not supplied to the bubble, so when the bubble grows, the gas pressure is reduced. In addition, the force of inertia also increases the amount of ejected liquid. When the inertial force to the liquid, in the end, becomes proportional to the restoring force, which accompanies the decrease in the gas pressure, the growth of the bubble is stopped, and reached a state of maximum bubble (step (d) according to Figure 10). As part of the gas in a state of maximum bubble is at a pressure substantially lower than atmospheric, as a result, the bubble begins to disappear, and the liquid in the surrounding is blasti rapidly absorbed in the space, which was occupied by the bubble (step (e) according to Figure 10). In accordance with the movement of the flowing fluid, which is accompanied by the disappearance of the bubble, is also a force is applied, which sucks the liquid located near the ejection channel in the heater. Since the velocity vector according to this force passes in the opposite direction of the velocity vector for flying ejected fluid between the spherical part, which serves as the core drops, and the flowing fluid is formed and stretched liquid, having the form of a column (the column of liquid). As a result, the portion of the column of liquid is extended (step (f) according to Figure 10). And after some time after the disappearance of the bubble is ejected liquid, which can no longer support the status column of liquid, separated, testing the counter-influence of the liquid viscosity, and becomes a drop of liquid (step (g) according to Figure 10). During this scattering, which gives a drop of liquid forms a fine mist. In the end the flying drop of liquid is additionally divided, forming the main drop and a minor drop (satellite) in accordance with the speed difference between them and the surface tension of the liquid (step (h) according to Figure 10). Since the satellite is flying behind cos the main drops, then, when he comes into contact with the surface of the paper, the position of the "landing" is shifted from the position of "planting" the main drops. This leads to deterioration of image quality.

On Fig presents a schematic diagram illustrating a conventional process of throwing implemented system that provides end-to-end bubble jet (PCA) throwing, which is the normal head inkjet printing, resulting bubbles are communicated with the atmosphere. The height of the duct is made smaller than in a system that provides JV throwing, shown in Figure 10. For the same part of the process, as in the case of the system implementing the JV throwing away and shown in figure 1, the explanation will be omitted. According to the process of the disappearance of the bubble (steps (e)-(g) according Fig) between a place in the front in the flow channel of the ink back into the ink flow channel there is a difference in how pulling the meniscus inside the ejection channel, so that the meniscus becomes asymmetric (step (f) according Fig). Therefore, when the ejected droplet is separated from the meniscus, the rear of the tail end portion of the ejected drops curves (step (g) on Fig). Thus, the satellite is formed in a curved tail, will fly on a trajectory shifted from the trajectory of the main droplet, and "sit" position, spaced about the provisions of the "landing" main drops.

In recent years, inkjet printer, which requires a high-resolution image, such as when issuing photographic prints, it is preferable to reduce, to the extent possible, education satellites, which causes deterioration of image quality. In connection with the process reduce the formation of satellites, which are described, for example, in the tiled application No. N10-235874 patent Japan, it is known that the length of the tail (ink tail) flying liquid droplets decreases. In tiled application No. N10-235874 on the Japan patent also describes that the interval between the ejection channels locally reduced to increase the force of the meniscus, and the fluctuation of the surface of the liquid in the channel is reduced ejection force of the meniscus and reduces the tail of the flying ink droplets.

Summary of the invention

Objectives of the invention

However, the design described in the posted application No. N10-235874 patent Japan, designed with the assumption that head, providing a high-quality image, such as the head for the issuance of photographic prints, use a size larger than that of the ejection channel, and that the size of the liquid droplets to be thrown away too long. When the construction described in the posted application No. N10-235874 patent Japan, note the following for the head, such as head for the issuance of photographic prints, which emits a very small drop of liquid, a mechanism for separating liquid droplets is basically no different from normal, and a value, which can be achieved by cutting the tail (the length of the ink droplets)is not more than about 5 μm, although it depends on the speed of projection. That is, in accordance with the design described in the posted application No. N10-235874 patent Japan, emitted when the volume is great, as usual, are the effects of reducing the satellites. But when the ejected volume is as small as is used for the head corresponding to the one used for obtaining the above-described photographic quality, the effects of reducing the satellites almost not achieved.

Therefore, the authors of the present invention has taken into account the fact that for the further reduction of the length of the tail in order to reduce the satellite should be done adequately earlier point branch of the ejected fluid. That is, during the period within which the ejected liquid, stretching out from the ejection channel, separated from the liquid inside the ejection channel, the head of an ejectable liquid continues to move forward. Thus, the sooner there comes a time when the ejected liquid is separated from the liquid in the channel vipasyana is, the shorter becomes the tail of the flying liquid droplets. From this point of view it is preferable to make the moment of separation ejectable liquid coming before moving it up to the middle of the process of the disappearance of the bubble.

However, it is difficult to make the moment of separation ejectable liquid coming earlier, while adhering to the usual mechanism of separation.

Means of solving problems

As means for solving the above problems in accordance with the invention, a method for ejection of the liquid from the ejection channel by application to fluid energy, the method includes steps in which:

bring the liquid in movement on the said ejection channel, which includes a cross-section of the above-mentioned ejection channel relative to the direction of ejection of the liquid, the two tabs that are mentioned inside the ejection channel, and the liquid in the form of a column is stretched out from the above-mentioned ejection channel in said direction of ejection of the liquid,

pulling the liquid surface, which is located on both sides of these two tabs and in the area between these two projections in the above-mentioned ejection channel, in a direction opposite to said direction of ejection of the liquid, so about what atom, the liquid located in the above mentioned fields, connected with the said liquid in the form of a column and is in contact with distal ends of the two protrusions; and

separating the said liquid in the form of a column of liquid, disposable in the mentioned areas, to eject the liquid from the above-mentioned ejection channel, so that the fluid located in the mentioned region, is in contact with distal ends of the two protrusions.

Preferably, the application of energy to the liquid is an application of thermal energy to the liquid by using heat-generating member, by means of thermal energy in the fluid is formed a bubble, and when the volume of the bubble decreases, the liquid in the above-mentioned ejection channel is pulled in a direction opposite to said direction of ejection of the liquid.

According to the way the bubble may not be communicated with atmospheric air or to communicate with the atmospheric air.

According to another variant of the invention, a method for ejection of the liquid from the ejection channel by application to fluid energy, the method includes steps in which:

bring the liquid in movement on the said ejection channel, which includes a cross-section referred to channel the ejection direction of the ejection liquid, one projection, which is mentioned inside the ejection channel, and the liquid in the form of a column is stretched out from the above-mentioned ejection channel in said direction of ejection of the liquid,

pulling the liquid surface, which is located on both sides of the above ledge and in the area between the distal end of the said projection and the edge of the ejection channel, the opposite distal end of the said projection, the said ejection channel in a direction opposite to said direction of ejection of the liquid so that the liquid is placed in the above mentioned fields, connected with the said liquid in the form of a column and is in contact with the distal end of the said projection and the edge of the ejection channel; and

separating the said liquid in the form of a column of liquid, disposable in the mentioned areas, to eject the liquid from the above-mentioned ejection channel, so that the fluid located in the mentioned region, is in contact with the distal end of the said projection and the edge of the ejection channel.

According to another variant of the invention, a method for ejection of the liquid from the ejection channel by application to fluid energy, the method includes steps in which:

lead LM is the bone in the movement on the said ejection channel, which includes a cross-section of the above-mentioned ejection channel relative to the direction of ejection of the liquid, three knobs, speakers mentioned inside the ejection channel, and the liquid in the form of a column is stretched out from the above-mentioned ejection channel in said direction of ejection of the liquid,

pulling the liquid surface, which is located on both sides of the above-mentioned protrusions, in the above-mentioned ejection channel in a direction opposite to said direction of ejection of the liquid so that the liquid is positioned in the above mentioned fields, connected with the said liquid in the form of a column and is in contact with distal ends of said projections; and

separating the said liquid in the form of a column of liquid, disposable among the distal ends of said projections, to eject the liquid from the above-mentioned ejection channel, so that the fluid located in the mentioned region, is in contact with distal ends of said tabs.

Advantages of the invention

As described above, in accordance with the present invention when the ejected liquid, stretched out from the ejection channel must be separated from the liquid that remains in the channel select is syvania, you can do coming much earlier and this ensures a greater reduction satellites and fog, which degrades the image quality.

Brief description of drawings

On Figa-1C presents the cross-section of the nozzle to head, throwing liquid, applied to the present invention and the drawings respectively illustrating the shape of the heater and duct, seen from the ejection channel, and the channel shape of the projection.

Figure 2 presents a diagram illustrating the process of throwing in the cross section of the head, made along the line a-a shown in Figv.

Figure 3 presents a diagram illustrating the process of throwing in the cross section of the head, made along the line B-B, shown in Figv.

4 shows a graph illustrating the relationship between the minimum diameter for the thickness of the columns of liquid and processes of disposal, as shown in figure 2, and 10.

On Figa-5C presents schematic drawings illustrating the shape of the channel dispersion, which is made in the cylinder, expelling the liquid, applied to the present invention, when all along channel dispersion made one projection made three protrusion and the protrusion, respectively.

On Figa-6C presents schematic drawings, illustrious the e variants dispersion liquid using the head, shown in Figa-1C.

Figure 7 presents a schematic perspective representation of a substantial portion of the device, release the liquid, applied to the present invention.

On Fig shows the cartridge installed in a printing device, release the liquid, applied to the present invention.

On Figa and 9B presents a schematic perspective representation of a substantial part of the head, throwing the liquid, applied to the present invention and the drawing of the channel dispersion in an enlarged scale.

Figure 10 is a diagram illustrating the process of ejection system for carrying out the cops throwing, which is the normal round ejection channel.

On Figa-11F presents schematic drawings illustrating a manufacturing technology printhead producing liquid, applied to the present invention.

On Fig is a diagram illustrating the process of ejection system for performing PCA throwing, which is the normal round ejection channel.

On Fig is a diagram illustrating the process of ejection system for performing PCA throwing in accordance with one embodiment, viewed in the direction perpendicular to the speaker is from.

On Fig is a diagram illustrating the process of ejection, considered in the direction of the ledge, for a system implementing the PCA throwing in accordance with the aforementioned embodiment.

On Fig presents a schematic drawing illustrating an exemplary head for this variant implementation.

On Figa and 16B presents schematic drawings illustrating an exemplary head in accordance with the aforementioned embodiment.

On Fig presents a schematic drawing of the channel dispersion in relation to this variant implementation.

On Figa and 18V presents schematic drawings of the ejection channel in the comparative example.

On Figa and 19C presents schematic drawings of the ejection channel in the comparative example.

On Fig presents a schematic drawing illustrating the tabs for this variant implementation and the flow of fluid formed between them.

On Figa and 21B presents a schematic diagram illustrating the tabs in the comparative examples and the movement of fluids formed between them.

The best option of carrying out the invention

In this description, the term "printing" determines the formation of significant information such as drawings. In addition, the term "printing" includes General information about the image, sketch, drawing, etc. on the printed media information, regardless of whether it is important or not important, or rendered if the information so that it can be perceived visually. In addition, the term "printing" includes the case of processing the medium by applying a liquid to the media. In addition, the term "media printed information" includes not only paper used in common printing device, but also in a broad sense applies to media that can receive ink, such as cloth, plastic film, metallic plate, glass, ceramics, wood or leather. Moreover, the term "ink" or "liquid" refers to a material that should be applied to the printed media information for forming images, sketches, drawings, etc. in Addition there is also the liquid which is used as the processing of the substances for processing the medium of printed information or for coagulation liquid supported on a carrier of printed information, or to prevent such dilution liquid. The term "hydraulic resistance" refers to the unimpeded movement of the liquid: for example, when the movement of fluids within a narrow area is not smooth, hydraulic resisting film to prevent the pressure increases, and when the movement of fluids within a narrow plot is smooth, the flow resistance decreases. It is assumed that terms such as "parallel", "perpendicular" and "linear"are used in this description with regard to tolerance, which is approximately equivalent to a manufacturing error.

About the device, releasing liquid

Figure 7 presents a schematic perspective representation illustrating the cylinder, expelling the liquid for which the present invention is applicable, and a substantial part of the exemplary device, releasing the liquid (ink jet printer)serving as a device producing a liquid that uses this cylinder.

Printer, release the liquid, includes in the case 1008 transporting the node 1030, which interrupts transports the sheet 1028, which is a carrier of printed information, in the direction indicated by arrow R. in Addition, printer, release the liquid, includes a print unit 1010, which moves parallel to the direction S perpendicular to the direction P, which is transported by the sheet 1028, and it is for this node is the head, throwing the liquid; and a node 1006 drive movement, which serves as dvizhuschegosya for reciprocating movement of the printing node 1010.

Transporting the node 1030 includes a pair of nodes a and 1022b rollers and a pair of nodes a and 1024b rollers, which are arranged parallel to each other and opposite each other, and the node 1020 actuator, which causes these nodes rollers in motion. When a node 1020 actuator is driven, the sheet 1028 captured nodes a and 1022b of ridges and nodes a and 1024b rollers and is transported intermittently in the direction of R.

Site 1006 drive includes a belt 1016 and a motor 1018. The belt 1016 wrapped around pulleys a and 1026b, which are mounted on rotating shafts interval, so that they are positioned against each other and parallel nodes a and 1022b rollers. The motor 1018 is driven in the forward direction and the backward direction of the belt 1016, which is associated with Dobby element a print node 1010.

When the motor 1018 is running and the belt 1016 is rotated in the direction indicated by the arrow R, Dobby element 1010 is moved in the direction indicated by the arrow S, the set distance. In addition, when the belt 1016 is moving in the opposite direction of the arrow R, Dobby element a moves opposite to the direction of the arrow S, the set distance. In addition, in position to be used as the starting position for Dobby e is ementa a, opposite emit ink faces the printing node 1010 is regenerating node 1026.

The print unit 1010 includes a cartridge 1012 installed with the possibility of withdrawing at Dobby element a. For individual colors such as yellow, Magenta, cyan and black, respectively prepared cartridges 1012Y, 1012M, 1012C and 1012B.

About cartridge

On Fig shows the approximate cartridge that can be installed on the above-described printing device, releasing the fluid. The cartridge 1012 according to this variant implementation is serial, and the main section is formed by a cylinder 100, releasing the liquid, and the tank 1001 for liquid, in which is stored a liquid such as ink. The head 100, releasing the fluid in which to eject the liquid made numerous channels 32 of projection compatible with the individual variants of implementation, which will be described later. Fluid, such as ink, must be entered from the tank 1001 fluid channel of the fluid supply (not shown) in a conventional camera fluid head 100, releasing the fluid. For cartridge 1012 according to this variant implementation of the head 100, releasing the liquid, and the tank 1001 for liquid executed as a single unit. However, you can use the construction in which the tank 1001 for liquid which may be connected to the cylinder 100, throwing out the liquid.

Will now be explained for the head, release the liquid, mounted on the above-described printing device, releasing the liquid.

Head design that release liquid

On Figa presents a schematic perspective representation, more specifically illustrating the essential portion of the head, throwing the liquid, applied to the present invention, as for example, electric wiring for excitation of the heat generating element is not shown. Arrow S on Figa indicate the direction (main scanning direction), in which move the head and the medium of printed information with respect to each other during the print operation, in which the head ejects liquid droplets. In this embodiment, as shown in Fig.7, shows an example in which the head moves relative to the carrier printed information during the print operation.

The substrate 34 includes a supply channel 33, which is a through aperture having the shape of the long groove for the fluid in the duct. Heat-generating elements (heaters) 31, which are the means of generating thermal energy are arranged in a matrix at intervals equivalent to the setting of 600 dots per inch (dpi), and this matrix is zigzagoon what about on either side of the feed channel in the longitudinal direction, so you get a 1200 t/d For the substrate 34 is provided by a wall 36 with streams and plate 35 with the ejection channels, with the channels 32 of the ejection, as the elements forming the ducts.

The shape of the ejection channels

The channel shape of the ejection with respect to the present invention will be explained using Figa-1C. On Figa presents the cross-section of the nozzle, Figw - image forms of the heater and duct. On Figs shows the shape of the ejection channel.

As shown in Figs, the channel shape of the dispersion according to the invention has a distinctive feature, namely, that in the channel ejection from the inside from the outer edge of the executed at least one protrusion. The tabs are made symmetrically, and the minimum diameter of the N channel dispersion is formed between the protrusions. The width of the ledge or gap between the projections becomes area 55 high hydraulic resistance, which is the first area in which the hydraulic resistance is significantly higher than the hydraulic resistance of the other channel dispersion. And on both sides (in positions on both sides of the protrusions) on the border area 55 high resistance provided by region 56 low hydraulic resistance as the second areas. The essence of this invention consists in the om, between the area of high hydraulic resistance and the area of low hydraulic resistance there is sufficient difference in hydraulic resistance. Therefore, it is preferable that the protrusion was local and that the hydraulic resistance in areas of low hydraulic resistance was not as high as in the case where the protrusions are not. Since applied this construction to the outer edge of the channel ejection apply an arbitrary shape such as a circle, an ellipse, or a rectangle.

On FIGU presented in an enlarged scale of the drawing, which illustrates an exemplary channel dispersion, shown in Figa. Generally speaking, the deterioration of image quality due to the "landing" of droplets of ink in offset positions on the front surface of the paper is because the ink droplets that are ejected through the same channel dispersion, form a line on the printed media information. That is, the image quality suffers a stronger negative impact of the shift positions of the droplets of ink in a direction perpendicular to the scanning direction of the head than the shift of the provisions of the ink drops in the direction S of the scanning head. In the case shown in Figv shape of the channel dispersion, which has a pair of projections, it should be noted that, when these shall ectopy made asymmetrically, due to the differences in the forms of these projections, especially the lengths of the projections, ink droplets that have already "got", shifted in the direction in which the tabs are (direction S on Figa and 9B). Thus, it is preferable that the protrusions in the ejection channel is parallel to the main direction S of the scanning head. With this arrangement, it is possible to reduce the negative impact on the image quality due to inconsistencies in the form of protrusions. In addition, as well as for the case in which the head full spectrum carries out printing using a printhead, the width of which is equal to the width of the media printed information, or exceeds it, for the same reason indicated above, it is preferable that the projection was performed in the main scanning direction (the direction in which the head and the medium of printed information are moving relative to each other during the print operation, in which the head ejects ink droplets).

In addition, it is preferable that the surface 35A with the ejection channels (the surface opposite the medium of printed information) there was a process of vodootlivnye and so drawn to the surface with channels ejection side of the ledge was a projection of a convex shape. Because on the surface with the ejection channels and directed to the surface with calaminariae side protrusions are made water-repellent layer, the separation of the back part of the ejectable liquid passes more smoothly.

On the principle of throwing

To reduce drop-satellites fluid, as described above, should effectively reduce the length of the liquid droplets from the distal end to the rear end. Accordingly, this invention applies a new mechanism for separating liquid droplets to make earlier point in separating liquid droplets. This principle of ejection will be explained with charts of the process of projection.

The example of a bubble-jet ejection

Figure 2 presents the diagram of the process of disposal under this option implementation. Figure 2 shows the state of the ejection system, providing a bubble-jet (PS) throwing, in which bubbles are not communicated with the atmosphere. Steps (a)-(g) according to Figure 2 represents a cross-section of the head along the line a-a shown in Figv, and steps (a)-(g) according to Figure 3 represents a cross-section of the head along the line B-B, shown in Figv. The individual steps (a)-(g) according to Figure 2 correspond to the individual steps in the steps (a)-(g) according to Figure 3.

First of all, because the process of growth of the bubble from the state shown in step (a) according to Figure 2, to state the maximum bubble shown in step (d) according to Figure 2, is the same as in the ordinary case, his explanation is given will not be. The bubble is in a state of maximum bubble shown in step (d) according to Figure 2, increased inside channel release.

The gas in the minimum bubble is at a pressure substantially lower than atmospheric. Therefore, the volume of the bubble as a consequence, decreases, and the surrounding liquid is quickly absorbed into the place where there was a bubble. Due to this movement, which also occurs inside the ejection channel, the fluid is returned to the heater. However, since the ejection channel moulded into the shape shown in Figs, the liquid spontaneously absorbed from the place where there is no protrusion, i.e. from the area of low hydraulic resistance. At this point, the liquid surface is formed on a plot of low hydraulic resistance, which is located between the inner wall facing the inside surface of the channel dispersion, and a liquid in the form of a column, largely drawn, presumably buying a concave shape to the heat generating element. On the other hand, the liquid while trying to stay in the area between the projections, i.e. in the area of high hydraulic resistance. Thus, as shown in step (e) according to Figure 2, the liquid inside the ejection channel, the OST is raised about the open end of the ejection channel, so the surface of the liquid (liquid film) extends only between the tabs on the area of high hydraulic resistance. That is, the surface of the liquid, which is connected with the liquid in the form of a column, stretched out from the ejection channel, is held in high hydraulic resistance (first area), as well as in many areas of low hydraulic resistance (second regions), while the liquid inside the ejection channel is drawn to the heater. In the resulting state, the liquid surface is significantly degraded, forming a concave shape on the many areas of low hydraulic resistance (in this embodiment, two such sites). This condition is obtained for the liquid 52 in the form of a column (i.e. the column of liquid), shown in the three-dimensional image on Figa-6P.

Thus the amount of fluid that remains between the tabs on the area of high hydraulic resistance, less than the amount of liquid limited in accordance with the diameter of the liquid in the form of a column, and the liquid in the form of a bar locally narrows the tabs, and forms a narrowed part.

In this case, Figa presents a perspective view of the model, illustrating the state of a column of fluid, seen from e.g. the effect, perpendicular projections. On FIGU presented in an enlarged scale perspective view of the model, illustrating the tapered part of a column of fluid. This tapered part formed at the base of a column of fluid of the upper sections of the projections depicted in both directions on Figa, 6V.

As a result, the surface of the liquid (liquid film)associated with the column of liquid, stretch out from the ejection channel, is held in high hydraulic resistance between the tabs and the Department of the column of liquid, stretch outward from the channel dispersion, occurs in a limited portion of a column of fluid, which is formed in the area of high hydraulic resistance at the upper sections of the protrusions (Figs). Because ejectable liquid is separated in accordance with this agreement in time, the moment of separation can be adjusted so that it will be earlier than the usual time, about 1-2 microseconds or more. That is, assuming that the speed of ejection of a liquid drop is 15 m/sec, the length of the tail is reduced by an amount equal to or more than 15-30 microns.

When the fluid between the tabs almost no force is applied to suck out fluid to the heater in connection with the disappearance of the bubble. Sledovatel is but in contrast to the usual case, the velocity vector does not indicate the direction opposite to the direction of the velocity vector flying emitted fluid, and the velocity at the rear end of the liquid droplets becomes more adequately than the normal speed. In addition, the phenomenon in which a section of the column ejected liquid is stretched and substantially extended, does not occur in the ejectable liquid is smoothly separated. And the fog, which usually occurs when the separation of the ejected liquid column of liquid), largely suppressed.

Then the rear end of the flying liquid droplets become spherical due to surface tension and is shared with the formation of the main drops and secondary droplets (satellites). It should be noted that when the difference between the speed on the rear end of the ink droplets and the speed at its distal end becomes very small, separated partner is merged with the main drop, either during flight or on the front surface of the paper, and preventing the formation of essentially separate companion.

Figure 4 shows a graph of the ratio between the minimum diameter for thicknesses of columns of fluid, shown in figure 2 (line P), and illustrates the process of ejection according to this invention, and according to Figure 10 (line Q) are illustrated by the tra the investment process of ejection, the phases of throwing. It should be noted that the minimum diameter to thickness of a column of fluid is a diameter of a portion of a column of fluid that is ejected through the ejection channel and has the smallest cross section in the direction of ejection, with the exception of the spherical portion, which serves as an ink droplet. In addition, steps (d)-(g) along the horizontal axis correspond to the individual steps in figure 2, and 10.

Figure 4 thickness of the original columns of liquid are different, because the ejection channel for this variant implementation is formed by separating the usual round of channel dispersion into two semicircular segments and the introduction of the projections between the semicircular segments, so that the maximum diameter of the ejection channel is increased compared to normal.

As shown in the graph, in accordance with the usual layout time minimum diameter to thickness of a column of fluid decreases with an almost constant speed. On the other hand, in accordance with the arrangement according to the invention is found that during the process of the disappearance of the bubble velocity changes dramatically changing due to the fact that the achievement of the minimum diameter to thickness of a column of fluid is required. Probably this is because, as the belt is ALOS above, due to the delay of the local meniscus, followed by the disappearance of the bubbles, the amount of fluid that is in contact with the column of liquid held by the protrusions decreases sharply, and at the base of the column of liquid is formed a limited part. Thus, at stage (e) is felt that the thickness of the column of liquid becomes extremely small, and the moment of separation ejectable liquid to become a leading and comes earlier than the usual time.

Example-through bubble-jet ejection

On Fig presents a schematic diagram of the process of ejection according to this variant implementation for end-to-end bubble jet (PCA) ejection, during which the bubbles are communicated with the atmosphere. Steps (a)-(g) according Fig represent a cross-section of the head is performed from a direction perpendicular to the ledge, and steps (a)-(g) according Fig represent a cross-section of the head, performed with the directions on the ledge. Steps (a)-(g) according Fig correspond to steps (a)-(g) according Fig. The explanation in the part that corresponds to the above explanation of the system implementing the COP throwing, will be omitted. As a condition of the health of the PCA, it is only necessary to reduce the distance IT from the heater to the ejection channel (up to 2030 μm) compared with the previous example with PS (Figa-1C). Accordingly, the bubble is also growing up (in the direction of the ejection channel) (step (d) according Fig), and the meniscus is also drawn further inside, in the ejection channel and communicates with the bubble in the nozzle (step (f) according Fig). Thus, in areas of low hydraulic resistance of the meniscus is easily drawn, and the state in which the liquid film extends between the projections, prepared earlier, and the moment of separation of a liquid drop is earlier.

In addition, shown in Fig the case of conventional ejection channel, which has no protrusion, the rear end of the tail ejected ink droplets is bent, and the satellite flies along the trajectory, which is shifted from the trajectory of the main droplet. However, when the projections are made, as in this embodiment, compared with the conventional PCA, not only the effect expressed in the fact that the moment of separation ejected liquid droplets is earlier, and the tail is shortened, but also prevented the effect, as a result of which the tail is bent at the moment of separation, as shown in step (g) under section 12. As shown in Fig and 14, this is because the separation of the ink droplets occurs between the projections in the channel ejection, and the ink drop is separated always in the center of the ejection channel. Therefore, when the field is e ejected ink droplets is supported by the linearity of the trajectory, and it is possible to prevent the occurrence of the satellite and the deterioration of the image.

About the form of tabs

Now describe in more detail the preferred form of the projection used for this invention. The shape of the projection in this case is a form of projection that is perceived when considering the ejection from the direction of ejection of the liquid, i.e. represents a cross-section of the ejection channel associated with the direction in which it should occur discarding liquid.

The shape of the ejection channel in this embodiment is shown in Fig. For the proper formation of the above-described area 55 high hydraulic resistance and areas 56 low hydraulic resistance, it is preferable that the length W of the shortest section in the area of low hydraulic resistance was greater than the shortest distance H (the space between the protrusions)formed by the protrusions.

It should be noted that when the number is two or less and when the width of the protrusion is essentially the same, except for the portion of the distal end having a curvature, and land base must be satisfied the inequality M≥(L-a)/2>N, where M denotes the minimum diameter of the outer edge of the ejection channel, when the protrusion is not (in the case of two protrusions, as in this embodiment, the OS is enforced, is the distance from the base of one ledge to the base of another; if one protrusion is the distance from the base of the ledge to the corresponding edge), L denotes the maximum diameter of the ejection channel, "a" denotes the width of the protrusions and H denotes the distance from the distal end of the protrusion to the outer edge of the channel dispersion in the direction in which the facing convex protrusion. Then between the area of a circular plot of channel dispersion and the area between the projections is achieved balance, suitable for the method of disposal according to the invention. In a more preferred embodiment, M ≥ (L - a). In addition, the interval H between the projections is greater than 0, and when the liquid film is held between the tabs is a system of carrying out throwing, for this variant of the incarnation.

X Fig denotes the area of the ledge. Area X of the protrusion is a rectangle or square formed by two parties: the length of the projection (x1- the length from the base to the distal end of the protrusion) in the direction in which the protrusion inside the ejection channel (in the direction facing the convex protrusion, and the width of the base of the ledge in the direction of the width of the projection (x2linear distance from the point of the bend at the base of the ledge to a point of curve on the opposite side operatating the end of the ledge). When point bending to determine the x2unclear points bending consider two points tangent line drawn from the outer circumference of the ejection channel to the base of the ledge. In this embodiment, since the projections are in the range of 0 < x2/x1≤ 1,6, you can increase the force holding the liquid surface between the protrusions, it is possible to properly hold the meniscus between the projections in the vicinity of the surface of the ejection channel until the moment when separated, the liquid drop, and you can reduce the length of the tail. Also, since installing the inequality M≥(L-a)/2>N, the balance between the area of the semicircular sections of the ejection channel and the area between the projections is more suitable for implementing the method of disposal according to this invention.

Since in this invention the liquid film is formed and held between the projections at an earlier stage after the formation of a column of liquid, this liquid column is cut on the side of the liquid film flow near to the surface of the ejection channel, and is ejected as ink droplets. Thus, the tail of the ejected ink droplets becomes short. It is important that the liquid film is held between the projections until the moment when separated, the liquid drop, and you must give distal to the HQ protrusions such form, which will easily hold the liquid film between the projections (i.e. will be easy to maintain surface tension).

On Fig presents a schematic drawing for explaining the movement of the liquid inside the ejection channel in the process of disappearance of the bubble, in accordance with this embodiment. The channel dispersion according to this variant implementation has such a shape that it is made semicircular sections, and between them is inserted tabs. Therefore, in the process of disappearance of the bubbles to areas of low hydraulic resistance, shown in Fig, a force is applied, so that the meniscus is reduced toward the side of the heater in a semicircular form, as shown in the part where there's no shading, and the liquid film between the projections tend to resist, which is shown by hatching. In addition, for both sides of the projections provided by linear sections, and since these linear sections parallel to each other, the meniscus in the areas of low hydraulic resistance tends to fall in the form of a semicircle. Further, this embodiment shows an example in which the distal end of the protrusion has a curvature; however, the distal end of the protrusion can be shaped with linear plots perpendicular to the direction in which the facing convex protrusion, for example, the distal end of the protrusion may the be quadrangular, and effects according to this variant implementation will still be achieved.

As used above, the protrusion and the channel shape of the ejection described above, the force for holding the liquid film between the projections is high, as shown in the model on Figv and 6S. During the period shown in Figv when forming a column of liquid, and after a moment, shown in Figs, when the liquid column is separated from the liquid film, and flies, between the projections supported by the liquid film. Therefore, the place where supposed to separate the column of liquid from the liquid film flow is close to the surface of the ejection channel, so that it is possible to shorten the length of the tail drops of liquid to be throwing, and this leads to reduction of the satellites.

In addition, as shown in cross section on Figa, due to the symmetries of the provisions of the meniscus and the stability of the dispersion, it is preferable that the Central axis of the section of the channel dispersion in the direction of ejection of the liquid is perpendicular to the surface of the ejection channel and element generating energy. In the case where the Central axis of the section of the channel is not perpendicular to the ejection surface of the ejection channel or heat-generating element on the stage of disappearance of the bubble, when the position of the meniscus at the site of the ejection channel of the offset is conducted to the heat-generating element, asymmetry of the provisions of the meniscus can be significant and satisfactory achievement effects of the invention will be possible.

Form ledges for comparative examples

On Figa and 18B shows the shape of the projections for the comparative examples. The ejection channel, shown in Figa, has a shape formed by connecting the two circles. The longest side of the channel dispersion is limited by the size of 20.0 μm, and the short side is limited by the size of 4.5 μm. For a space X the ledge, marked on Figa dotted rectangle, x1(the distance in the direction toward the center of the channel dispersion) is 2.9 mm, and x2(the width of the base of the protrusion) is 9.8 μm: x2/x1=3,4. On FIGU shows the model of projection, which corresponds to the interval between steps (e) and (f) according to Figure 3 or the steps (e) and (f) according Fig. Addressing Figv, note that before the column of liquid is separated from the liquid in the ejection channel, begins to stop fluid retention between the tabs and cut off the section of the column of liquid is lowered to the side of the heater in the channel dispersion. Therefore, the length of the tail drops of liquid to be throwing out the same short, as in the case of a form provided by the embodiment, and that causes SDA is nicks.

This occurs for the following reasons. Because the tabs shown in Figv have sharp transitions near the distal ends, and forms the distal end is pointed, the meniscus force is applied that is different from the one that matches the variant of implementation, when the bubble disappears, and the liquid in the ejection channel is allocated to the side of the heater. During the disappearance of the bubble ink moving to the side of the heater slowly, as they are close to the inner wall of the channel dispersion. Thus, as shown by the shaded part on Figa, the liquid remains located along the inner surface of channel dispersion and, as shown by where there's no shading part, in the centre of the channel of the ejection force is applied, which force the meniscus in shape, similar to the connection of the two circles. Thus, the liquid located between the two ribs, pulled to the side of the heater, and it is unlikely that this liquid is held between the tabs.

On the other hand, for channel dispersion, shown in Figa, the shape of the protrusions is very blunt. The longest side of the channel dispersion is limited by the size of 20.6 μm, and the short side is limited by the size of 7.7 μm. For a space X the ledge, marked on Figa dotted rectangle, x1(the leg in toward the center of the channel dispersion) is 2.2 mm, and x2(the width of the base of the protrusion) is 8.2 μm: x2/x1=3.7V. On FIGU shows the model for this case, which corresponds to the interval between steps (e) and (f) according to Figure 3 or the steps (e) and (f) according Fig. On FIGU, as Figv, it is shown that before the column of liquid is separated from the liquid in the ejection channel, begins to stop fluid retention between the tabs and cut off the section of the column of liquid is lowered to the side of the heater in the channel dispersion. Therefore, the length of the tail drops of liquid to be throwing out the same short, as in the case of a form provided by the embodiment, which causes the appearance of satellites.

This is because when the bubble disappears, and the liquid in the ejection channel is allocated to the side of the heater, the meniscus force is applied that is different from the one that corresponds to the option exercise. Because the tabs shown in Figv, very blunt, there is almost no difference between the area of high hydraulic resistance, which holds the liquid, and areas of low hydraulic resistance, which omit the meniscus to the side of the heater. Thus, during the disappearance of the bubble, as indicated by the shaded part on FIGU, the liquid remains positioning is the action scene along the inner wall of the channel dispersion and, as shown by where there's no shading part, in the centre of the channel of the ejection force is applied, ensuring the drainage of fluid to the side of the heater, and it is unlikely that this liquid is held between the tabs.

Other forms of ejection channels, applicable to the present invention

Further in accordance with this embodiment on Fig, 16A and 16B show examples, viewed from the direction perpendicular to the surface of the heater. The head design on Pig has a shape in which the projections for the two-channel projection. The first channel 6 throwing performed communicating with the duct 5 on the heater, the second channel 7 ejection, smaller than the first channel of the ejection performed on the first channel 6 ejection, and the protrusions 10 are made on the second channel 7 ejection. Because the first channel dispersion is large, it is possible to suppress the clogging of the liquid to be throwing, and you can form a small drop of liquid in the second channel of projection. In addition, you can reduce the tail of an ejectable liquid on the ledges of the second ejection channel, and in addition, because there the first section of the channel dispersion having a low resistance, increases the efficiency of ejection. Further, since the icon is moved, the resistance of the nozzle in the forward direction, bubble easy growing up in the ejection channel, and during the disappearance of the bubble, you can delay the meniscus in the nozzle with great force, so that the state in which the liquid film extends between the tabs can be prepared earlier and then the moment of separation drops of liquid coming ahead.

On Figa and 16B presents drawings showing the tabs with a wedge-shaped forms. On Figa shown that the channel dispersion is performed linearly in the direction of ejection, and the protrusions are wedge-shaped, tapering in the direction of projection. On FIGU-emitting section and the protrusions are wedge-shaped, as a result be tapering in the direction of projection. Since the resistance in the direction of ejection is reduced through the use of this form, you can obtain the same effects as in the above-described two-stage ejection channel, and achieved effects as increasing the efficiency of dispersion and reduction of the period of separation ink droplets. Next, Figv shown that it is possible to apply the same wedge angle for channel dispersion and projections, however, it is preferable that the protrusions had a larger wedge in the direction of projection. When the interval between the projections is more narrow on the upper side of the ejection channel (the side that is closest to poverhnosti plate with channels ejection), than on the bottom side (the side of the heater), the surface energy in the liquid held between the tabs has a tendency to increase. The liquid film is unlikely to move down to the bottom, where the interval between the projections is increased, and easily held on the upper side. Therefore achieves the effect that the liquid to be throwing, easily separated at the position close to the plate surface with the ejection channels, and the tail drops of liquid subject to ejection is reduced.

In any case, it is preferable that the Central axis of the section of the channel dispersion in the direction of ejection of the liquid is perpendicular to the surface of the ejection channel and the heat generating element and that both forms is a two - step wedge were symmetric about the Central axis of the section of the channel dispersion, taking into account the symmetries of the provisions of the meniscus and stability of projection.

In addition, the number of protrusions is not limited to two, and in the framework of the invention does not exclude the case of a single protrusion, as shown in Figa, or the case of the three tabs, as shown in Figv. When the number of projections is equal to the unit interval H between the projections showing the shortest distance from the distal end of the protrusion to the outer edge of the channel dispersion. In addition, the protrusion may b the th thinner than the item that is supposed to generate the channel dispersion. Further, when there are many tabs, these tabs can be provided in different sizes. The formation of too large number of protrusions is not preferable, because the channel shape of the protrusion becomes complicated and is easy plugging fluid.

A method of manufacturing the head, throwing liquid

Because the substrate 34 can serve as one part of the element forming ducts, and can function as a bearing element for a heat generating element, duct, plates with channels ejection, etc. on the substrate material specific no restrictions, and can be applied, for example, glass, ceramics, plastic or metal. In this embodiment, the substrate 34 is applied to the silicon substrate (wafer). The formation of channels ejection can be performed using a laser beam or you can also apply the exposing device such as SUPL (mirror installation projection lithography)for use of the photosensitive resin as the material of the plate 35 with the ejection channels to form channels of projection. In addition, the wall 36 with streams is performed on the substrate 34 in such manner as the coating by centrifugation, while tenka 36 channels for ink and plate 35 with the ejection channels can be simultaneously obtained in a single element. Or the pattern of the ejection channels can be obtained by lithography.

On Figa-11F presents schematic drawings illustrating a manufacturing technology printhead for this variant implementation. Preparing a silicon substrate 34 on which is mounted the circuit and the heater 31 (Figa). On the silicon substrate 34 shown in Figa, applied photosensitive resin and carry out exposure and development for forming the pattern of the section 38 serving as ducts (Pigv). Then put photosensitive resin 36, which becomes a wall with streams and plate ejection channels to cover section 38 serving as ducts (Figs). Carry out the exposure and the manifestation of the photosensitive resin 36 for forming the pattern of the channels 32 of the ejection, which include protrusions 10 a convex shape (Fig.11D). By applying anisotropic etching method that uses the difference between the etching speeds, due to the orientation of the crystals, form a channel 33 of the ink from the reverse side of the surface forming the ducts, the silicon substrate 34 (Fige). And, finally, the photosensitive resin 36, located on sections of the ducts, is dissolved by the solvent, and the areas where there has been a dissolution, mills is raised ink channels, and forming a hollow head ends (Fig.11F). For the thus obtained plot heads carry out electrical installation and form the supply channel, intended for the supply of ink, and also provide the cartridge head.

To verify the effects of the present invention, produced heads having different structures, in accordance with the following implementation options and assessed the separate heads.

Option 1 implementation, comparative example 1

In this embodiment, and in this comparative example, the state in which threw the liquid observed by stroboscopic pictures and directly after separation of the ejected fluid measured the time required for separation of the ejected fluid, and the length of the liquid droplets from the distal end to the rear end of the liquid droplets. It should be noted that the period of separation ejectable liquid is called the period of time after application of voltage to the heaters to the separation column of a liquid from the liquid film. The power supply for the heaters regulated in time so that I get the velocity out of a 13 m/s values of the physical parameters of the ink were as follows: viscosity 2.1 centipoise (CP), a surface tension of 30 Dyne/cm and a density of 1.06 g/cm3. If estvo satellites is the average of ten samples number of satellites, observed one throwing. In addition, measured by changing the number of particles in the form of a mist. Design heads for option 1 implementation and comparative example 1, and the measurement results are shown in the following table 1.

Table 1
The channel shape of the ejectionThe diameter φ of the ejection channel
[µm]
OH
[µm]
The duct height h
[µm]
The shape parameters of the ledge [µm]The period of separation ejectable liquid [ISS]The length of the liquid droplets [µm]The number of satellites (average of ten samples)
Width
a
Length
b=x1
x2x2/ x1
Option 1 implementation16,6251435,9the 4.7 0,88,51171,1
Comparative example 1-1: lap16,62514----111563
Comparative example 1-2: lap132514----101162,2

Inside the ejection channel has a pair of protrusions 10, is designed so that the cross-section of the ejection channel in the direction of projection of the distal ends of the protrusions directed toward the center of gravity of the ejection channel, and a straight line connecting distal ends, passes through the center of projection. In area X protrusions length x1projections in the direction in which the facing convex projections, is equal to the length b of the protrusion. If tabs no, the minimum diameter M of the virtual edges of the channel, the protrusion defines the distance from the base of one ledge to the base of another ledge and equal to the diameter φ of the channel dispersion, specified in the table. The largest diameter L of the channel dispersion is a value obtained by adding the width "a" of the ledge with the value of φ, as indicated in table. The minimum diameter of the N channel dispersion determines the interval between the projections and has the value obtained by subtracting the value of b×2 from the value of φ. As to the ratio of the width "a" of the ledge with the value of the field x2ledge, because the base of the protrusion extends through the platen by means of photolithography, the region x2the ledge is a few microns longer than the width "a" of the ledge. In this embodiment, x2/x1=0.8 and x1≥x2.

As shown in Figa-1C, the height h of the duct 5 is 14 μm. Distance (HE) from heater 31, which are heat generating elements to the surface of the plate 35 with the ejection channels is 25 μm. The dimensions of each of the heater 31, which is located in the chamber of bubbles, where bubbles constitute 17,6 x 17,6 mm. Long side L of each channel is throwing a 19.6 μm. The short side of the M virtual outer edge of the channel dispersion, which represents the distance from the base of one of the projection 10 to the base of another ledge, makes 16.6 μm. The length b of the protrusion is 5.9 μm, the width "a" dis is real end is 3 μm, and the distance H from the distal end of one projection to the distal end of the other lug is 4.2 μm. The distal ends of the projections 10 have a diameter of curvature R of 2.2 μm, and the ends rounded. The amount of emissions is approximately 5.4 ng. It should be noted that the tabs have the same thickness as the plate ejection channels. The ejection channel has such a shape that a circle of diameter φ of 16.6 μm is divided into two semi-circular section, and the protrusions are inserted between the semi-circular sections. The power supply for the heaters was adjusted so that the received speed ejection of droplets of ink, comprising 13 m/s, and by means of this head has been throwing.

As head of comparative example 1-1 was applied round the ejection channel having a diameter φ of 16.6 μm. The other construction is the same as for option 1 implementation. The volume emission rate was 5.8 ng. In accordance with a head, used in comparative example 1-1, the period of separation ejected liquid droplets was 11 ISS, whereas in the version 1 implementation was required to 8.5 μs, and in the version 1 implementation period until the ejected liquid was separated, was much smaller. The length of the drop was 117 μm in embodiment 1 of implementation and was equal to 156 μm to head in comparative example 1-1. It shows who is calling, what length drops decreased by an amount equal to the difference in time division for the ejectable liquid to or greater than the difference between the speed of ejection × difference in time division: 13 m/s × (11 ISS is 8.5 µs) = 32,5 mm, Number of satellites at this point was an average of 1.1 option 1 implementation and was equal to 3 for the head in comparative example 1-1. In addition, when measured by changing the number of particles in the form of a mist, it was 15 in the above-mentioned embodiment, and it is 3800 to head in comparative example 1-1. As is evident from the above results, the number of satellites has decreased dramatically in the construction according to this variant implementation, if we compare it with the comparative example 1-1.

In addition, to ensure the effects of the reduction of the satellites according to this invention, implemented comparative example 1-2, illustrating the approximate ejection channel, which has a velocity dispersion that is different from the one that was in version 1, but has essentially the same length drops of liquid, and the shape of the channel dispersion is a circle having a diameter of 13 μm. The amount of emissions at this time was 3 mg. In the case of a head used in comparative example 1-2, the period of separation ejectable liquid was 10 μs, the length of the liquid droplets was 116 μm, and the number of satellites was 2.2.

When comparing this option with comparative example 1-2 discovered that the number of satellites is small in the case of a head used in this embodiment, although the length of the tails are almost the same. This shows that even when the length of the ink droplets shortened by reducing the period that must pass before the moment of separation ejectable liquid, there is not only the effect of reducing the satellites. That is, in accordance with the design according to this invention, while the tail has a small length, the speed difference between the part, which is the main drop, and the rear end of the discharged liquid is very small due to differences in the mechanism and the determination of the moment of separation ejectable liquid. It also can be considered effective to reduce the satellites. In addition, through the mechanism of separation of the ejected fluid, which is provided by the design according to this invention, also significantly reduced the number of changing particles in the form of a mist, as compared with the conventional design.

Option 2 implementation, comparative example 2

Table 2 shows the results obtained under the same conditions as in embodiment 1 of implementation described above, except construction (diameter Kahn is La ejection, ducts, distance and forms ledges) head. Option 2-1 implementation is an example in which between the semi-circular areas with a diameter of 11 μm, as shown in Fig inserted the tabs, and the relationship between M, L and N and the values shown in the table is the same as for option 1 implementation. In this embodiment, x2/x1=1,35 and x2≥x1and the amount of emissions is 1.7 ng. In comparative example 2 is applied round the ejection channel with a diameter of 11 μm, and the volume of emission is 1.5 ng. In accordance with the head, with projections in this embodiment, the moment of separation of the liquid becomes earlier, compared with a circular channel in the comparative example. In addition, we could confirm that the drop of ejectable liquid was shortened, and the number of satellites has decreased. In addition, decreased dramatically changing the number of particles in the form of a mist.

Table 2
The channel shape of the ejectionThe diameter φ of the channel dispersion [µm]OH
[µm]
The duct height h [μm]Parameters form the protrusion is [µm] The period of separation ejectable liquid [ISS]The length of the liquid droplets [µm]The number of satellites (average of ten samples)
Width
a
Length
b=x1
x2x2/x1
Option 2 implementation11of 17.57,53,54of 5.41,354,5550
Comparative example 2-2: lap11of 17.57,5----81082,9

Option 3 implementation, comparative example 3

Table 3 shows the results obtained under the same conditions as in option 2, the implementation described above, except construction (diameter Cana is and throwing, ducts, distance and forms ledges) head.

Options c 3-1 3-5 implementation are examples in which between the semi-circular areas with a diameter of 11 μm, as shown in Fig inserted the tabs, the dimensions of which are given in the table, and the relationship between M, L and H, and the values shown in the table is the same as for option 1 implementation. In these embodiments, the implementation of the volume of emissions is 1.7 ng. In the range of 1.6 ≥ x2/x1as shown in the variants with 3-1 3-5 implementation, received a small number of satellites. In comparative example 3-1 is applied round the ejection channel with a diameter of 11 μm, and the volume of emissions is 1.6 ng. In comparative example 3-2 is used the form in which between the semi-circular areas with a diameter of 11 μm is inserted protrusions with a length of 0.7, and the amount of emission of 1.7 ng. In this case, in comparative example 3-2 x1for a space X protrusions is 0.7 μm, and x2is 3.0 μm, and x2/x1=4,3. The separation time released liquid has shortened the length of the liquid droplets, the number of satellites - all of these parameters increased in comparison with the variants of the implementation.

Table 3
The channel shape of the ejection The diameter φ of the ejection channel
[µm]
OH
[µm]
The duct height h
[µm]
The shape parameters of the ledge [µm]The period of separation ejectable liquid [ISS]The length of the liquid droplets [µm]The number of satellites (average of ten samples)
Width
a
Length
b=x1
x2x2/x1
An implementation option
3-1
11207,52,13,33,51,16791
An implementation option
3-2
11207,53,33,5a 4.91,4679 1
An implementation option
3-3
11207,53,54of 5.41,46761
An implementation option
3-4
11207,53,25,35,00,96,5761
An implementation option
3-5
11207,52,62,94,61,66791
Comparative example 3-1: lap11207,5---- 7,5951,7
Comparative example 3-2: lap11207,520,73,04,391273,3

Option 4 implementation, comparative example 4

Table 4 shows the results obtained under the same conditions as in option 3, the implementation described above, except that the diameter of the channel throwing more increased.

Option 4 implementation is an example in which between the semi-circular areas with a diameter of 13 μm, as shown in Fig inserted the tabs, the dimensions of which are given in the table, and the relationship between M, L and N and the values shown in the table is the same as for option 1 implementation. In this embodiment, x2/x1=0.8 and x1≥x2. The amount of emissions is 2.3 ng. In comparative example 4 is applied round the ejection channel having a diameter of 13 μm, and the volume of emissions is 2.3 ng. In line with this for the head used in this embodiment, which has projections at apostal the research Institute of comparative example was confirmed, that moment of separation of liquid was earlier, a drop of an ejectable liquid was shortened, and satellites has decreased. The changing number of particles in the form of a mist has fallen sharply.

Table 4
The channel shape of the ejectionThe diameter φ of the ejection channel
[µm]
OH
[µm]
The duct height h
[µm]
The shape parameters of the ledge [µm]The period of separation ejectable liquid [ISS]The length of the liquid droplets [µm]The number of satellites (average of ten samples)
Width
a
Length
b=x1
x2x2/x1
An implementation option 413207,524,43,50,8675 0,1
Comparative example 4: lap13207,5----8,51182,6

Option 5 implementation, comparative example 5

Table 5 presents the parameters used head obtained by replacing the structure (diameter of the ejection channel, the distance of the height of the duct and forms ledges) that which was described above for option 4 implementation. In addition, the power supply to the heaters is regulated so that the speed of ejection of a liquid drop was 18 m/s, and the values of the physical parameters of the ink were as follows: viscosity of 2.2 SP, a surface tension of 34 Dyne/cm and a density of 1.06 g/cm3.

Option 5 implementation is an example in which between the semi-circular areas with a diameter of 14.3 μm were inserted the tabs, the dimensions of which are given in the table, and the relationship between M, L and N and the values shown in the table is the same as for option 1 implementation. In this embodiment, x2/x1=0.9 and x1≥x2. In comparative example 5 used the tsya round ejection channel, having a diameter of 13.6 μm, and the diameter of the ejection channel was selected in order to match with the volume of emissions, amounting to 4.0 ng in version 5 implementation. Because the speed of the ejection liquid droplets larger than in the above embodiment, the number of satellites increases, becoming more than the above-mentioned embodiment. However, for head, with projections in this embodiment, it was possible to confirm when matched with a circular channel in the comparative example, that the moment of separation of liquid was earlier, the length of a drop of an ejectable liquid was shortened, and satellites has decreased. In addition, changing the number of particles in the form of a mist also decreased sharply.

Table 5
The channel shape of the ejectionThe diameter φ of the channel dispersion [µm]OH
[µm]
The duct height h [μm]The shape parameters of the ledge [µm]The period of separation ejectable liquid [ISS]The length of the liquid droplets [µm] The number of satellites (average of ten samples)
Width
a
Length
b=x1
x2x2/x1
An implementation option 514,326163,35,55,10,911207a 4.9
Comparative example 5:13,62616----122176,5

As described above for the individual embodiments through the use of a head according to the variants of implementation, it is possible to reduce deterioration of image quality due to drops of satellites liquid or mist. In addition, in the above embodiments, the implementation was applied example using heaters as elements that generate energy. However, the present and the finding is not limited and can be applied to a case of using a piezoelectric element. In the case of the use of the piezoelectric element in the process of disappearance of the bubbles is not required, and by feeding an electrical signal to the piezoelectric element to expand the fluid chamber can be ensured pulling the meniscus inside the ejection channel.

Although the present invention is described with reference to possible embodiments of, it should be understood that the invention is not limited to the described possible ways of implementation. The volume of claims the following claims should be considered in the context of the broad interpretation as encompassing all possible modifications and equivalent structures and functions.

In this proposal put forward claims priority under Japanese patent application No. 2005-343943, filed November 29, 2005, which in its entirety is given here as a reference.

1. The method of ejection of the liquid to eject the liquid from the ejection channel by application to fluid energy, the method includes steps in which:
bring the liquid in movement on the said ejection channel, which includes a cross-section of the above-mentioned ejection channel relative to the direction of ejection of the liquid two tabs, which are mentioned inside the ejection channel, and the liquid in forestalia stretched out from the above-mentioned ejection channel in said direction of ejection of the liquid,
pulling the liquid surface, which is located on both sides of these two tabs and in the area between these two projections in the above-mentioned ejection channel in a direction opposite to said direction of ejection of the liquid so that the liquid is placed in the above mentioned fields, connected with the said liquid in the form of a column and is in contact with distal ends of the two protrusions; and
separating the said liquid in the form of a column of liquid, disposable in the mentioned areas, to eject the liquid from the above-mentioned ejection channel, so that the fluid located in the mentioned region, is in contact with distal ends of the two protrusions.

2. The method according to claim 1, wherein the application of energy to the liquid is an application of thermal energy to the liquid by using heat-generating member, by means of thermal energy in the fluid is formed a bubble, and when the volume of the bubble decreases, the liquid in the above-mentioned ejection channel is pulled in a direction opposite to said direction of ejection of the liquid.

3. The method according to claim 2, in which the bubble is not communicating with the atmospheric air.

4. The method according to claim 2, in which the bubble is communicated with the atmospheric air.

5. the manual ejection of the liquid to eject the liquid from the ejection channel by application to fluid energy, the method includes steps in which:
bring the liquid in movement on the said ejection channel, which includes a cross-section of the above-mentioned ejection channel relative to the direction of ejection of the liquid one projection, which is mentioned inside the ejection channel, and the liquid in the form of a column is stretched out from the above-mentioned ejection channel in said direction of ejection of the liquid,
pulling the liquid surface, which is located on both sides of the above ledge and in the area between the distal end of the said projection and the edge of the ejection channel, the opposite distal end of the said projection, the said ejection channel in a direction opposite to said direction of ejection of the liquid so that the liquid is placed in the above mentioned fields, connected with the said liquid in the form of a column and is in contact with the distal end of the said projection and the edge of the ejection channel; and
separating the said liquid in the form of a column of liquid, disposable in the mentioned areas, to eject the liquid from the above-mentioned ejection channel, so that the fluid located in the mentioned region, is in contact with the distal end of the said ledge and the edge of the ejection channel.

6. The method of ejection of the liquid to eject the liquid from the ejection channel by application to fluid energy, the method includes steps in which:
bring the liquid in movement on the said ejection channel, which includes a cross-section of the above-mentioned ejection channel relative to the direction of ejection of the liquid three lugs projecting inward of the above-mentioned ejection channel, and the liquid in the form of a column is stretched out from the above-mentioned ejection channel in said direction of ejection of the liquid,
pulling the liquid surface, which is located on both sides of the above-mentioned protrusions, in the above-mentioned ejection channel in a direction opposite to said direction of ejection of the liquid so that the liquid is positioned in the above mentioned fields, connected with the said liquid in the form of a column and is in contact with distal ends of said projections; and
separating the said liquid in the form of a column of liquid, disposable among the distal ends of said projections, to eject the liquid from the above-mentioned ejection channel, so that the fluid located in the mentioned region, is in contact with distal ends of said projections.



 

Same patents:

FIELD: printing industry.

SUBSTANCE: in method for arrangement of slot for supply of ink into semiconducting substrate for jet printing head, the first structural element is formed by means of multiple application of electric energy discharge to the first side of semiconducting substrate or by means of abrasive material application on the first side of semiconducting substrate, vibration is imparted to tool opposite to the first side, besides tool vibrates with a certain frequency and at a certain distance from the first side for formation of the first structural element, material of semiconducting substrate is removed from the second side for formation of the second structural element, besides at least part of the first and second structural elements crosses for formation of slot for ink feed, which passes through semiconducting substrate, and for removal method is used, which has been selected from group, including wet etching, dry etching, laser treatment, sand drilling, treatment with abrasive jet, rotary-vibration drilling, cutting with saws and mechanical treatment in machines.

EFFECT: fast formation of slot for ink feed in semiconducting substrate for jet printing head with low costs.

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FIELD: technological processes.

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EFFECT: possibility to arrange moment of ejected liquid separation as occurring earlier and to reduce tail of flying drop of liquid.

19 cl, 37 dwg

FIELD: printing.

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EFFECT: invention provides stable manufacturing of substrate for fluid ejection heads with form accuracy and high efficiency of technological process.

7 cl, 17 dwg

The invention relates to a manufacturing device for inkjet printing

FIELD: polygraphic industry.

SUBSTANCE: printing head for jet printing has die of outlet holes for ink injection into surfaces, producing outlet holes for injection, on which a protective tape is adhered in process of transportation. Surface that forms outlet holes for injection has outer area, which is located outside from each of opposite ends of die versus direction of die, and this outer area has resistance to flaking, which is provided by change of surface, besides this resistance is higher than on other section of surface, which produces outlet holes for injection.

EFFECT: invention provides fro printing of high-quality photographic images.

11 cl, 17 dwg

FIELD: technological processes.

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19 cl, 37 dwg

FIELD: technological processes.

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EFFECT: possibility to arrange moment of ejected liquid separation as occurring earlier and to reduce tail of flying drop of liquid.

19 cl, 37 dwg

FIELD: polygraphic industry.

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EFFECT: invention provides fro printing of high-quality photographic images.

11 cl, 17 dwg

FIELD: printing industry.

SUBSTANCE: invention relates to method for liquid ejection to eject liquid from ejection channel by application of energy to liquid. Method includes the following stages: liquid is put in motion along ejection channel, which comprises, in cross section, relative to direction of ejection, two ledges inside the channel, then liquid surface that is arranged on both sides of two ledges and in area between two ledges in channel in direction opposite to direction of liquid ejection is pulled so that liquid arranged in specified area is joined to liquid in the form of column and is in contact with distal ends of two ledges, and them liquid in the form of column is separated from liquid arranged in specified area to eject liquid from ejection channel, so that liquid arranged in specified area is in contact with distal ends of two ledges.

EFFECT: invention makes it possible to reduce formation of satellites (secondary drops) and to accordingly improve quality of printing.

6 cl, 37 dwg

Fluid ejector // 2470790

FIELD: process engineering.

SUBSTANCE: proposed device comprises multiple address lines and line to transmit starting signal. Besides, it comprises multiple nozzle circuits connected with starting circuit and multiple address lines. Every circuit of nozzle is configured in switching on to eject fluid via different multiple nozzles in response to starting signal. Subset of multiple address lines is connected to every pair of multiple nozzle circuits. Every subset connected to one pair of nozzle circuits is selected so that simultaneous activation of every address line in said subset switches on every nozzle circuit in pair or pairs of nozzle circuits connected with that triad of address lines and no one of other nozzle circuits on multiple nozzle circuits.

EFFECT: ejection of different-size drops depending upon activation type.

15 cl, 15 dwg

FIELD: process engineering.

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EFFECT: higher strength and ejection at lower drag.

6 cl, 10 dwg

FIELD: printing.

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EFFECT: invention provides stable manufacturing of substrate for fluid ejection heads with form accuracy and high efficiency of technological process.

7 cl, 17 dwg

FIELD: technological processes.

SUBSTANCE: invention is related to head that ejects liquid, which carries out printing by means of drops ejection onto carrier, device that ejects liquid and method of liquid ejection. Liquid-ejecting head, in which liquid is ejected from ejection channel due to application of energy to liquid, besides ejection channel comprises one ledge having convex shape and arranged inside ejection channel, the first area for maintenance of liquid surface, which must be related to liquid in the form of column stretched outside from ejection channel, when liquid is ejected from it, and, in condition when the first area is created, the second area, to which liquid must be sucked in ejection channel in direction opposite to direction of liquid ejection, and which has hydraulic resistance that is lower than hydraulic resistance of the first area, at the same time the first area is created in direction, in which ledge shape convexity is inverted from distal end of ledge, and the second area is created on both sides from ledge.

EFFECT: possibility to arrange moment of ejected liquid separation as occurring earlier and to reduce tail of flying drop of liquid.

19 cl, 37 dwg

FIELD: printing industry.

SUBSTANCE: in method for arrangement of slot for supply of ink into semiconducting substrate for jet printing head, the first structural element is formed by means of multiple application of electric energy discharge to the first side of semiconducting substrate or by means of abrasive material application on the first side of semiconducting substrate, vibration is imparted to tool opposite to the first side, besides tool vibrates with a certain frequency and at a certain distance from the first side for formation of the first structural element, material of semiconducting substrate is removed from the second side for formation of the second structural element, besides at least part of the first and second structural elements crosses for formation of slot for ink feed, which passes through semiconducting substrate, and for removal method is used, which has been selected from group, including wet etching, dry etching, laser treatment, sand drilling, treatment with abrasive jet, rotary-vibration drilling, cutting with saws and mechanical treatment in machines.

EFFECT: fast formation of slot for ink feed in semiconducting substrate for jet printing head with low costs.

19 cl, 14 dwg

FIELD: printing industry.

SUBSTANCE: invention relates to method for liquid ejection to eject liquid from ejection channel by application of energy to liquid. Method includes the following stages: liquid is put in motion along ejection channel, which comprises, in cross section, relative to direction of ejection, two ledges inside the channel, then liquid surface that is arranged on both sides of two ledges and in area between two ledges in channel in direction opposite to direction of liquid ejection is pulled so that liquid arranged in specified area is joined to liquid in the form of column and is in contact with distal ends of two ledges, and them liquid in the form of column is separated from liquid arranged in specified area to eject liquid from ejection channel, so that liquid arranged in specified area is in contact with distal ends of two ledges.

EFFECT: invention makes it possible to reduce formation of satellites (secondary drops) and to accordingly improve quality of printing.

6 cl, 37 dwg

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