Microinjection device

 

(57) Abstract:

Microinjection the device is designed for inkjet printing. In microinjection device between the protective layer and blocking layer heating chamber formed layer to enhance the adhesion of the liquid connection isooctanol series. Layer to enhance the adhesion can increase the adhesion between the protective layer and blocking layer heating chamber and thus improves the total injection capacity microinjection devices and improves the performance. 5 C.p. f-crystals, 7 Il.

The present invention relates to microinjection device, and more particularly to microinjection device, which can significantly improve the overall performance of the printing device by increasing the strength of adhesion of the protective layer and barrier layer of the heating chamber.

In General, microinjection devices are widely used in inkjet print heads, Micronase medical devices, devices for fuel injection, etc.

Unlike dot matrix printers inkjet printers are able to operate in different colors thanks to the use of kartra application of inkjet printing devices.

Such inkjet printing device comprises a print head with multiple nozzles, having the smallest diameter. Printhead performs printing by converting the bubbles and the swelling of the paint and its application to printed paper.

Design and principle of operation of inkjet printing devices are described in U.S. patent N 4490728, entitled "Thermal ink jet device", U.S. patent N 4809428, entitled "thin-film device for an inkjet printhead and method of manufacture", U.S. patent N 5140345, entitled "Method of manufacturing a substrate for zhidkostnuyu of the recording head and the substrate produced by this method", U.S. patent N 5274400 entitled "the Geometry of the trajectory paint for high temperature operation of jet printhead", and U.S. patent N 5420627, entitled "Inkjet printhead".

In such a conventional inkjet print head to spray paint the outside is applied to the high temperature generated by the resistive heating layer. However, when the paint is exposed to high temperatures for a long period of time, may occur thermal changes in the components quack paint.

Recently, to overcome this problem of low durability use lamellar membrane between the resistive heating layer and a camera for paint. The vapor pressure of the working fluid filling the heating chamber, causes the dynamic deformation of the membrane, so that you can effectively spray paint in the camera to paint.

In this case, the membrane is inserted between the camera for the paint and the resistive heating layer prevents direct contact of the resistive heating layer of paint, making it possible to minimize thermal change of the paint.

Thus, the inkjet printhead containing membrane is formed by overlaying the resistive heating layer of the heating chamber, the membrane chamber for ink and nozzles on a substrate, for example, from a silicon material.

In such a conventional inkjet printhead resistive heating layer formed on the substrate and a limited locking layer heating chamber is fed with electric power from the outside through the contact with the electrode layer. However, because of the contact electrode layer on the on current, flowing through the electrode layer.

In the prior art it is known that to prevent leakage of electric current through the substrate it forms a protective layer, for example of SiO2to the electrode layer can be isolated from the substrate and thus was not possible leakage through the substrate of the electric current flowing through the electrode layer. In this case, the protective layer is in contact with the electrode layer, the resistive heating layer and a sealing layer of the heating chamber.

Barrier layer heating chamber formed on the protective layer, usually made of a polyimide, given its chemical resistance to the working fluid filling the heating chamber, and a protective layer made of SiO2i.e. from a material different from the material of the barrier layer heating chamber, noting the need for isolation of the electrode layer from the substrate. In this case, due to the difference in materials is weakened adhesion between the sealing layer of the heating chamber and the protective layer.

As a result of poor adhesion between the sealing layer of the heating chamber, and a protective layer, a gap m is Azor and onto the protective layer.

In this case, the resulting working fluid corrodes and destroys the protective layer. As a result of this significantly reduces the insulating ability of the protective layer. When there is frequent change of temperature and humidity, that is intense weakening of the adhesion between the sealing layer of the heating chamber and the protective layer.

As mentioned above, if not retained strong adhesion between the sealing layer of the heating chamber and the protective layer, it is impossible reliable formation of barrier layer heating chamber on the protective layer. In the result, finally formed barrier layer heating chamber is uneven in thickness.

In addition, if you apply additional heat treatment to improve durability of the barrier layer of the heating chamber, it is even more attenuated the adhesion between the protective layer and blocking layer heating chamber.

As a result of this significantly reduces the overall quality of printing performed by the printhead.

Known microinjection device containing a substrate having formed therein a protective layer, the resistive heating layer is formed of the active heater layer for transmission of an electrical signal, barrier layer heating chamber formed on the electrode layer, restrict heating chamber and in contact with the resistive heating layer, the membrane formed on the blocking layer of the heating chamber and in contact with the heating chamber, and the membrane made with the possibility of buckling or downwarping and variations in accordance with changes in the volume of liquid that fills the heating chamber barrier layer camera for a paint formed on the membrane with the ability to limit the camera to paint, located coaxially with the heating chamber, and a nozzle plate formed on the blocking layer of the camera to paint the possibility of forming a nozzle, being in contact with the camera for paint (patent EP N 0816083).

However, this microinjection device also has all the above-mentioned disadvantages of other devices belonging to the prior art.

Therefore, the aim of the present invention is to provide enhanced adhesion between the protective layer and blocking layer heating chamber.

Another objective of the present invention is revealing camera.

Another objective of the present invention is to increase the resistance barrier layer heating chamber to humidity and changes in temperature.

Another objective of the present invention is to achieve a uniform thickness of the barrier layer heating chamber.

According to the present invention to achieve the above objectives proposed microinjection device containing a substrate having formed therein a protective layer, the resistive heating layer formed on the protective layer, an electrode layer formed on the protective layer and in contact with the resistive heating layer for transmission of an electrical signal, the locking layer heating chamber formed on the electrode layer, restrict heating chamber and in contact with the resistive heating layer, the membrane formed on the blocking layer of the heating chamber and in contact with the heating chamber, when this membrane is made with the possibility of buckling or downwarping and variations in accordance with changes in the volume of liquid that fills the heating chamber barrier layer of cells is nagrevatelej camera, and a nozzle plate formed on the blocking layer of the camera to paint the possibility of forming a nozzle, which is in contact with the camera for the paint, which according to the invention in the protective layer is formed of a layer to enhance the adhesion between the protective layer and blocking layer heating chamber, and the layer to enhance the adhesion is in contact with the resistive heating layer, electrode layer and a sealing layer of the heating chamber.

It is advisable to layer to enhance the adhesion was formed by coating from a liquid connection isooctanol series.

Preferably as a liquid connection isooctanol number was used liquid-aminopropyl-triethoxysilane.

It is desirable that-aminopropyl-triethoxysilane was formed from a liquid 2,2,4-trimethylpentane, which mixed liquid NH2n(CH2)3Si(OCH2CH3)3in several percent.

It is possible that the chemical formula of liquid 2,2,4-trimethylpentane was (CH3)3CCH2CH(CH3)2.

It is useful to liquid NH2n(CH2)3Si(OCH2CH3)3was mixed with liquid the natives of the advantages offered layer to enhance the adhesion, formed between the protective layer and a sealing layer of the heating chamber, so as to enhance the adhesion between the protective layer and blocking layer heating chamber.

Layer to enhance the adhesion form from the liquid connection isooctanol series. Preferred is a layer to enhance the adhesion formed from a liquid-aminopropyl-triethoxysilane. Liquid-aminopropyl-triethoxysilane is formed from a liquid 2,2,4-trimethylpentane, with which is mixed NH2n(CH2)3Si(OCH2CH3)3in several percent. The chemical formula of liquid 2,2,4-trimethylpentane is (CH3)3CCH2CH(CH3)2NH2n(CH2)3. Si(OCH2CH3)3mixed with liquid 2,2,4-trimethylpentane preferably in the amount of 3-4 wt.%.

Therefore, according to the present invention can be significantly enhanced the adhesion between the protective layer and blocking layer heating chamber.

The invention and many of its inherent advantages will be easily understood from the following detailed description when considered in connection with the accompanying drawings, in which similar items are marked the same and is according to the present invention;

- Fig. 2 is a view in transverse section along lines I-I' of Fig. 1;

- Fig. 3 is a view illustrating a first operating position in accordance with the present invention;

- Fig. 4 is a view illustrating a second operating position in accordance with the present invention.

The objectives, features and advantages of the present invention will be better understood thanks to preferred variants of the invention with reference to the accompanying drawings.

Terms that will be used in the future, determined taking into account relevant features of the invention. However, it is clear that these terms can be changed at will or by consensus of the experts in this field. However, all definitions should be understandable, considering the essence of the present invention.

Inkjet printhead according to the present invention will be described with reference to the accompanying drawings.

As shown in Fig. 1 and 2, an inkjet printhead according to the present invention includes a substrate 1, for example, from a silicon material. On the substrate 1 is formed a protective layer of SiO2. On the protective layer 2 is formed of a resistive heating layer is extradry layer 3 to power the resistive heating layer 11 electricity, input from the outside. The electrode layer 3 is connected with a conventional electrode 12 due to the resistive heating layer 11 and the electric power supplied from the electrode layer 3 is converted into heat energy.

On the other hand, the electrode layer 3 is formed barrier layer 5 of the heating chamber 4 and forming a heating chamber 4 so that they cover the resistive heating layer 11. thermal energy released due to the resistive heating layer 11, is transmitted to the heating chambers 4.

In addition, the heating chamber 4 filled with the working fluid, which makes it easy to create steam pressure. The working fluid evaporates quickly under the action of thermal energy transmitted from the resistive heating layer 11. Moreover, the pressure of the steam produced by the evaporation of the working fluid is transmitted to the diaphragm 6 formed on the blocking layer 5 of the heating chamber.

The membrane 6 is barrier layer 7 camera for paint and defining a chamber 9 for paint coaxially with the heating chamber 4. Luggage for paint 9 filled with a given quantity of paint.

Over the blocking layer 7 camera for paint obrazovaniya paint out in the form of drops. The nozzle 10 is formed through the plate 8 is located on the blocking layer 7 camera for paint and coaxially with the heating chamber 4 and the chamber 9 for the paint.

In addition, between the protective layer 2 and the locking layer 5 heating chamber formed layer to enhance the adhesion of 20, which is the main feature of the present invention. Layer to enhance the adhesion 20 is formed on the protective layer 2 and is in contact with the resistive heating layer 11, the electrode layer 3 and the sealing layer 5 of the heating chamber. Layer to enhance the adhesion 20 thereby acts to enhance the adhesion between the protective layer 2 and the locking layer 5 of the heating chamber. Thus, the protective layer 2 and the barrier layer 5 of the heating chamber is not separated from each other even in adverse effects over a long period of high temperature and high humidity at the boundary surface between the protective layer 2 and the locking layer 5 of the heating chamber.

In the prior art it is known that due to differences in the materials of the protective layer and the barrier layer heating chamber between these layers, a gap having a given size. In this case, the working of liquids which reduces the insulating ability of the protective layer.

However, as mentioned above, in the present invention the layer to enhance the adhesion 20 formed between the protective layer 2 and the locking layer 5 heating chamber, acts to enhance the adhesion between the protective layer 2 and the locking layer 5 of the heating chamber. Due to the increased traction in advance it is possible to prevent formation of a gap between the protective layer 2 and the locking layer 5 of the heating chamber. Therefore, prevents leakage to the protective layer 2 of the working fluid fills the heating chamber 4. Thus, it is possible for a long period of time to maintain the insulating ability of the protective layer 2.

Layer to enhance the adhesion of 20 preferably is formed from a liquid connection isooctanol series. More preferred is the formation of a layer to enhance the adhesion of 20 of the liquid aminopropyl-triethoxysilane, for example, by a method of coating by centrifugation.

Liquid-aminopropyl-triethoxysilane preferably formed from a liquid 2,2,4-trimethylpentane to which mixed with a few percent liquid NH2n(CH2)3Si(OCH2CH3)3.

In this case, the liquid 2,2,4-trimethylpentane has formresult preferably in the amount of 3-4 wt.%.

Since according to the present invention, the layer 20 to enhance the adhesion between the protective layer 2 and the locking layer 5 heating chamber is formed on the protective layer 2 before the formation of the barrier layer 5 of the heating chamber, the adhesion between the protective layer 2 and the locking layer 5 heating chamber can remain strong, even if after the formation of layer 5, there is a high temperature heat treatment to improve its durability. As a result, the process can be performed under stable conditions, and therefore, the barrier layer 5 heating chamber will have a uniform thickness.

Next will be described the principle of operation of an inkjet printhead having the above structure.

As shown in Fig. 3, first, from an external source of power supplied electric signal to the electrode layer 3. Then, electric power is supplied to the resistive heating layer 11 in contact with the electrode layer 3, causing instant heating of the resistive heating layer 11 to a high temperature above 500oC. during heating, the electricity is converted into heat energy with a temperature of 500-550oC.

Polygraphically layer 11. The working fluid filling the heating chamber 4, under the action of transferred heat evaporates quickly with the formation of a given vapor pressure.

As mentioned above, since at that time already formed layer 20 to enhance the adhesion to prevent occurrence of a gap between the protective layer 2 and the locking layer 5 of the heating chamber, the working fluid filling the heating chamber 4, follows to the protective layer 2. Thus, it is possible to prevent damage to the protective layer 2 and keep it full insulating ability.

Further, the steam pressure is transmitted to the diaphragm 6 formed on the blocking layer 5 of the heating chamber and, accordingly, the membrane 6 is experiencing given impetus P.

In this case, the membrane 6 is swelt quickly outward, as shown by the arrow in Fig. 3, and rounded curves. Thus, the paint is 100, which fills the chamber 9 to the ink formed on the diaphragm 6, is exposed to a strong push bubbles and close to nature.

On the other hand, in the position shown in Fig. 4, when there is a rapid cooling of the resistive heating layer 11 due to the cessation elektricheskaya decreases. Thus, the inside of the heating chambers 4 quickly there is a state of vacuum. Under a vacuum, the membrane 6 is subjected prohibida force B opposite to the thrust, whereby the membrane deforms and is in its original state.

In this case, the membrane 6 quickly bends down, as shown by the arrow in Fig. 4, while the inside of the camera 9 to the ink is transferred to a large prohibida power. Accordingly, the paint is 100, which is due to the swelling of the membrane 6 is close to splash orderly takes an elliptical shape and a round shape under its own weight and, thus, sprayed the outside of the printing paper. Thus, there is a quick printing on the outside of the printing paper.

As mentioned above, between the protective layer and blocking layer 5 heating chamber to form a layer to enhance the adhesion between these layers. Layer to enhance the adhesion capable of a long time to maintain strong adhesion between the protective layer and blocking layer 5 of the heating chamber. Thus, it is possible to significantly increase the overall performance of the inkjet printing device.

Although what is shown and described, is preferred variant implementation of the present invention, specialists in the art will understand that can be done various changes and modifications of the invention, and that its elements can be replaced by equivalents without going over the scope of patent claims of the present invention. In addition, can be made many modifications to fit the specific situation to the technical solution according to the present invention without going beyond the scope of patent claims of the present invention. Therefore, it is understood that the present invention is not limited to the specific described variant of its implementation, but that the present invention includes all variations within the attached claims.

As mentioned above, the inkjet printing device according to the present invention contains a layer of connection isooctanol series to enhance the adhesion between the protective layer and blocking layer heating chamber, through which Ino, can be markedly increased the overall performance of the inkjet printing device.

1. Microinjection device containing a substrate having formed therein a protective layer, the resistive heating layer formed on the protective layer, an electrode layer formed on the protective layer and in contact with the resistive heating layer for transmission of an electrical signal, the locking layer heating chamber formed on the electrode layer, restrict heating chamber and in contact with the resistive heating layer, the membrane formed on the blocking layer of the heating chamber and in contact with the heating chamber, and the membrane made with the possibility of buckling or downwarping and variations in accordance with changes in fluid volume, filling the heating chamber barrier layer camera for a paint formed on the membrane with the ability to limit the camera to paint, located coaxially with the heating chamber, and a nozzle plate formed on the blocking layer of the camera to paint the possibility of forming a nozzle, which is in contact with kamalam and blocking layer heating chamber, moreover, the layer to enhance the adhesion is in contact with the resistive heating layer, electrode layer and a sealing layer of the heating chamber.

2. Microinjection device under item 1, characterized in that the layer to enhance the adhesion is formed by coating a liquid connection isooctanol series.

3. Microinjection device under item 2, characterized in that as a liquid connection isooctanol number of used liquid-aminopropyl-triethoxysilane.

4. Microinjection the device according to p. 3, characterized in that-aminopropyl-triethoxysilane formed from a liquid 2,2,4-trimethylpentane, which mixed liquid NH2n(CH2)3Si(OCH2CH3)3in several percent.

5. Microinjection the device according to p. 4, characterized in that the chemical formula of liquid 2,2,4-trimethylpentane is (CH3)3CCH2CH(CH3)2. 6. Microinjection the device according to p. 4, characterized in that the liquid NH2n(CH2)3Si(OCH2CH3)3mixed with liquid 2,2,4-trimethylpentane in the amount of 3 - 4 wt.%.

 

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