Method for generating pattern inside transparent or semitransparent materials, device for generating such pattern in part using proposed method

FIELD: shaping patterns inside transparent or semitransparent materials.

SUBSTANCE: proposed method and device make use of optical system that provides for such distribution of laser beam energy throughout cross-sectional area of material that laser breakdown trace is obtained, its shape being other than that of single ellipsoid.

EFFECT: enhanced quality of pattern.

16 cl

 

Group of inventions relates to food and/or light industry, namely to the technology of machining and forming images inside transparent or translucent solid material capable of perceiving controlled laser exposure, such as glass containers (bottles, cans, flasks, decanters etc), consumer goods (glasses, protective glasses hours, all kinds of panels of different devices and so on) and much more and can be used when labeling products to determine their belonging to specific manufacturers or in other words the identification of these products, as well as the manufacture of decorative items and Souvenirs.

The known method of forming a given image inside a transparent solid material by obtaining the set of traces of optical breakdown (micro destructions in the thickness of the glass), which is used for the production of Souvenirs, including the formation of a given image by successively focusing the laser beam on the coordinate points in the image and perform at selected points by a single laser pulse of the laser breakdown of the same size on the shape close to spherical, and using lasers with different resonators and the setting of a zoom telescopic is istemi you can change the size of the traces of optical breakdown (patent of Russia 2177881, CL 44 With 5/00, 10.01.2002 year).

Also known similar way to create images inside transparent solid material used for the manufacture of Souvenirs, with a laser beam (US patent 5637244, CL 23 To 26/02, 10.06.1997). Microfractures perform in two sizes: microfractures of the first size to form one part of the image, and microfractures of the second size to form the second portion of the image to obtain an image in two semitones, that is in two shades of gray. To implement the method uses singlemode TEMoo, solid-state laser q-switched and diffraction-limited divergence of the radiation. The area of each microfractures approximately limited to the ellipsoid, elongated in the propagation direction of the laser beam so that the length exceeds the cross-section of 1.5-2 times. This is because the area of optical breakdown of transparent material for a single pulse single-mode solid-state laser TEMoo has a direction along the axis of propagation of the laser beam.

A disadvantage of known methods is the limited use that is because mark breakdown for one laser pulse has the form type of failure is that with a sufficient degree of accuracy approximated by spherical or e is elipsoidal form, and similar (similar in appearance) the shape of the optical laser breakdown can be obtained on other equipment (using a different laser and forming optics).

The tasks of the proposed method are getting formed when the structure of the laser beam, namely the patterns of energy distribution on the cross section in the plane perpendicular to the optical axis and located after the focusing lens, traces of breakdowns strictly individual specified form (in accordance with engineering design), including those by the combination of parameters practically do not reproducible in other settings, as well as receipt of one pulse of laser radiation aggregate (group) traces of breakdowns located together or separately from each other and forming some flat or spatial composition.

Under the following optical laser breakdown hereinafter is meant a set of micro destructions in the thickness of the transparent or semi-transparent solid material, which is formed in a single product for a single laser pulse. The specified trace may be shaped as one body, and the aggregate of two or more phone

The specific type of laser breakdown or group of laser breakdown for each case is obtained by using the special the constraints generated for these purposes, the system of formation of laser radiation in the plane (area) of the laser breakdown and this system includes a laser, as well as the optical system, is made in a special way, including structural optical corrector. By definition, structural optical corrector is a device consisting of one or more optical elements designed to change (deformation) of the wave front of laser radiation, including its division into several wave fronts, and/or to modify the distribution of energy density in the field of the output wavefront (cross-sectional area of the output beam of laser radiation).

Technical result achieved when using the inventive method lies in the fact that expands the scope of use of the method and increases the reliability of identification using the method for marking of products.

The essence of the claimed invention in the portion of the method is that, as in the known method of forming image inside a transparent or translucent solid materials affecting this material using a pulsed laser beam which has passed through the optical system, with the formation inside the material traces of optical laser breakdown, forming the image in the thickness of the material without damaging surfaces.

When implementing the proposed method in contrast to the known use optical the th system, forming such an energy distribution of the laser beam in its cross section, which produces a trace laser breakdown with a form other than a single ellipsoid. Claimed in the present invention traces of breakdowns are project managed and structurally adjustable, and the cross section of such traces consists of passing from one to the other curved areas or passing from one to the other curved and straight portions. Including the shape and/or dimensions of such optical breakdown can be changed dynamically during run-marking. Also the present invention can dynamically in the process of applying the image to change the mutual position of the totality of breakdowns from one pulse of laser radiation.

The method may use an optical system, further comprising two or more cylindrical lenses arranged in the same plane so that the forming cylindrical surfaces arranged at an angle to each other.

The method can also be used in the optical system, further comprising at least two cylindrical lenses, mounted in the same plane, and rotate at least two of them in this plane in such a way that changes the angle forming between them a cylindrical item is used.

In the method according to the next result uses the optical system, further comprising a plane-parallel transparent plate with an optical inhomogeneity.

In the method using the optical system, further comprising at least one filter selected from the group: diffraction, diffuse, slateblue, star or other.

The method may use an optical system for splitting the pulsed laser beam at least two parts and focusing the received rays at selected points within a transparent or translucent solid material marked product. The method can also use an optical system that provides separation of the pulsed laser beam and focusing the received rays, at least one optical element that is similar to one of the above.

In the way in the process of image formation is possible to dynamically change the structure of the optical system with the aim of obtaining traces of optical breakdown of different shape, i.e. the shape of the optical breakdown can vary from pulse to pulse.

The optical system includes lenses with a special aberration correction and/or structure of the optical corrector. As structural optical to the of rector can use the additional optical component, for example, the item with the optical heterogeneity. The optical system may include at least one beam splitting and/or reflective element.

Also the present invention is applicable upon receipt of the laser image on the surface of any material.

The known device for forming a given image inside a transparent material, which are used for production of Souvenirs, including the formation of a given image by successively focusing the laser beam on the coordinate points, and running in selected points of the micro destructions of the same size on the shape close to spherical or elliptical, with a single laser pulse, and has the ability to change the size of the footprint breakdown (patent of Russia 2177881, CL 44 With 5/00, 10.01.2002, and the US patent 5637244, CL 23 To 26/02, 10.06.1997).

A disadvantage of the known devices is the limited use that is due to the fact that the trail breakdown of unit of exposure is the form type of failure is close to spherical or ellipsoidal shape, with similar (similar in appearance) the shape of the optical laser breakdown can be obtained on other equipment (using a different laser and forming optics).

The objectives of the claimed device are obtaining when the UE is supplied to the structure of the laser beam traces breakthroughs (points) an individual of a given shape (in accordance with engineering design) including and such that the set of parameters practically do not reproducible in other settings, as well as getting one laser pulse together the traces of breakdowns located together or separately from each other and forming some flat or spatial composition.

Technical result achieved when using the claimed device, is that expanding the scope of use and increases the reliability of identification using the device for marking of products.

The essence of the claimed invention of the device lies in the fact that in the apparatus for forming an image inside a transparent or translucent materials containing mechanism for installation of the product, the imaging unit comprising a source of pulsed laser radiation and the optical system, the optical system configured to form the energy distribution of the pulse laser beam in its cross section, providing a trace laser breakdown with a form other than a single ellipsoid. Form of possible cross-sections of the breakdowns described by the characteristic method. Moreover, the shape, size, number and relative positions of the traces can change during execution breakdowns.

The optical system m which may include, at least two cylindrical lenses, mounted in the same plane between the source of pulsed laser radiation and the lens, so that they form cylindrical surfaces arranged at an angle to each other.

According to another variant of the device optical system includes at least two cylindrical lenses, mounted in the same plane between the source of pulsed laser radiation and a lens with a possibility of rotation in the plane with the angle between them forming cylindrical surfaces.

The optical system may also include installed between the source of pulsed laser radiation and the lens plane-parallel transparent plate with an optical inhomogeneity.

The optical system of the device includes at least one filter selected from the group of diffraction, diffuse, slateblue, star, or other.

The optical system can be performed decentered.

The optical system includes a beam splitting element that ensures the separation of the laser beam, at least two parts, and focusing the received rays at selected points within a transparent or translucent solid material marked product.

The optical system includes a lens with a need for the my for this aberration correction and/or structure of the optical corrector. As structural optical corrector using additional optical elements, for example the part with the optical heterogeneity, the filter or filters with special effects.

The optical system may include at least one beam splitting and/or reflective element, at least two lens and structural optical corrector placed between the beam-splitting element and one of the lenses.

Famous products made partially or entirely of transparent or translucent material containing executed within a transparent or translucent material, the image formed of the same or different size micro destructions received by the laser beam passing through the optical system (patent of Russia 2177881, CL 44 With 5/00, 10.01.2002, and the US patent 5637244, CL 23 To 26/02, 10.06.1997).

A disadvantage of the known products is the limited use that is due to the fact that the trail breakdown from a single exposure in shape is close to spherical or ellipsoidal.

The objectives of the claimed invention in terms of product are receiving the products, which caused internal image when the managed structure of the laser beam, consisting of the set of traces of the breakdowns of individual specified form (in accordance with engineering Arnim design), including and such that the set of parameters practically do not reproducible in other settings, as well as getting products with image, composed of groups of breakdowns, each of which is received within one pulse of laser radiation and consists of breakdowns located together or separately from each other and forming some flat or spatial composition.

Technical result achieved when using the claimed product, is that expanding the scope of use and increases the reliability of identification using products containing the deposited marking the image of the specified type.

The essence of the claimed invention in the part of the product is that the product is made partially or entirely of transparent or translucent solid material contains made inside the image formed by the laser traces of breakdowns (or groups of signs of breakdown) of a given shape and configuration obtained by a laser beam passing through the optical system and the shape of each trace laser breakdown other than a single ellipsoid. Given the shape, size or group configuration breakdowns within the material of products is provided by the system of image formation, in particular optical system. The product is ipodnano according to the above method.

The invention is illustrated by drawings, where figure 1 shows the optical system with the lens and structural corrector and the product, in figure 2 - map of the distribution of energy in the spot scattering, the resulting system of figure 1 without part 1; figure 3 is the same, when the tilt of the optical system to plus 1 degree; 4 - the same, when the tilt of the optical system at minus 1 degree; figure 5, a cylindrical lens consisting of a single element; figure 6 - map of the distribution of energy in the spot scattering lens (items 2, 3, 4) with the lens 3; figure 7 is the same, when the tilt of the optical system by 1 degree; Fig shows the optical system with optical corrector; figure 9 - map of the distribution of energy in the spot scattering for systems Fig; figure 10 shows the optical system with optical corrector deployed relative to the optical corrector according Fig 90 degrees; figure 11 - map of the distribution of energy in the spot scattering received by the system in figure 10; Fig - cylindrical lens consisting of two elements forming the same; Fig the same, with the turn of one element relative to another on 90 degrees; Fig - type laser breakdown obtained by the system with the offsets on Fig and 10; Fig - optical system consisting of a telescope and decentered relative to the object it is and; on Fig - topograph of the energy distribution in the spot scattering, the resulting system on Fig; Fig the same, when the tilt of the optical system by 1 degree; Fig - diagram of the formation of trace laser breakdown of the two lenses; Fig and 20 shows the principle of image formation point offset from the plane-parallel plate of glass with heterogeneity; Fig - view footprint of the laser breakdown, the resulting system on Fig; Fig the scheme with beam-splitting prisms; Fig is a block diagram of a device for forming an image.

The method of forming an image within a transparent or translucent materials is that form by means of pulsed laser and optical system, the optical laser traces of breakdowns in the thickness of the material without damaging surfaces and alter the shape and/or dimensions footprint (including in the process of fulfilling breakthroughs to create structurally controlled traces of breakdowns optical system.

Illustrative example to show the creation of a managed process of formation of structurally controlled image footprint breakdown per pulse of the laser. Figure 1 shows designed for these purposes, the optical system containing the structural optical corrector 1, lens 2, 3, 4, forming a lens with a focal length of f′=30 mm and against the sustained fashion hole 1:n=1:1. Aberration correction of the lens is performed for the wavelength (lambda)=1,064 μm. Figure 2 shows the map of the distribution of energy in the spot of dispersion for this case. Figure 3 is a chart of the distribution of energy in the spot scattering of the same lens by tilting it relative to the optical axis to plus 1 degree. Figure 4 - the same, when the tilt minus 1 degree. Structural optical corrector in this optical circuit is part 1, which represents a concave-planar and cylindrical lens 5 (figure 5) with a diameter of 30 mm with a radius of curvature of the cylindrical surface R=480 mm and direction 6 generatrix of the cylindrical surface. Topograph of the energy distribution in the image obtained using an optical scheme (figure 1)presented on Fig.6. The same map when you angle optical system 1 degree presented on Fig.7. Trace laser breakdown in this case takes the form of a segment of length 1 mm, oriented parallel to the generatrix 6 (figure 5). It is obvious that by changing the design parameters of the offset can be in the specified range to change the values of the length and width of the image in the form of the segment. Consider the case where the structural optical corrector is in the form of two elements (two cylindrical convex-flat lens), for example, the first 7 (Fig and 12) 21 mm in diameter with a radius of curvature of cylindrica is some surface R=1100 mm and direction 10 (Fig) forming a cylindrical surface, and the second 8 (figure 10 and 12) in the form of a ring with an inner diameter of 21 mm and an outer diameter of 30 mm with a radius of curvature of the cylindrical surface R=2200 mm and direction 9 (Fig) forming a cylindrical surface. Using optical corrector 7 with lens f′=30 mm, consisting of three lenses 2, 3, 4 (Fig), we obtain the stain scattering in the form of a segment of a length of 0.3 mm, topograph of the energy distribution of which is shown in Fig.9. Using optical corrector 8 with the same lens f′=30 mm will get the same spot scattering in the form of a segment of a length of 0.3 mm, topograph of the energy distribution of which is shown at 11. If the orientation of the form 9 and 10 (Fig) cylindrical surfaces coincides when using the lens with the two correctors will be received laser breakdown in the form of a segment oriented parallel to the forming cylindrical surfaces. If the corrector 7 to deploy 90 degrees relative to the corrector 8 (Fig) and forming their cylindrical surfaces are mutually perpendicular, then using the Central zone of the lens corrector 7 is received laser breakdown in the form of a segment 11 (Fig), and the marginal zone of the lens corrector 8 is received laser breakdown in the form of a segment 12 (Fig) the same length as the segment 11. The shape of the laser breakdown per pulse of the laser takes the form of “cross the hundred”, shown in Fig. If the corrector 8 to rotate relative to the first corrector 7 with constant or variable speed, not synchronizing the rotation pulses of the laser, in this case, you will receive a group of traces laser breakdowns, representing overlapping segments, mutual angular orientation of which is random. The estimated range of radii (for example, at equal radii, in particular when R=480 mm) of the cylindrical surfaces of the correctors can achieve a “break” spot dispersion corrector 8 in the Central zone (laser puncture formed by the lens corrector 8 is in the form of two line segments that are located on the same line). Can structural optical corrector to make the three elements (three cylindrical lenses) and position they form cylindrical surfaces at an angle of 60 degrees. In this case, trace laser breakdown will be in the form of a six-rayed star. If we start to rotate these lenses relative to each other with a constant or variable speed, syncing this process with laser pulses, the probability of “fake” image consisting of the set of such traces, is practically zero.

By special aberration correction lenses for inclined beams (example: type of stain scattering in figure 3 and 4) or creating a decentered optical the e system (for example Fig), where the lens 13 garantirovan relative to the telescope 14 5 mm parallel to the optical axis, in this case, you can get the desired arbitrary shape scattering (Fig, 17). If, for example, to take even two of the same lens (the simplest case is two different lens or one lens with optical structural corrector, and the other without, etc. etc.)with aberration correction for one inclined beam in the form of the scattering point (Fig 3 and 4) and assemble them into a system according pig, the view point of the laser breakdown per pulse is characteristic only for this scheme, but it is absolutely arbitrary. In contrast with the optical corrector in the form of a cylindrical lens view point of such a laser breakdown cannot be repeated in other similar hardware. This type of point laser breakdown cannot be achieved with a single lens (one optical circuit). The point of such a laser breakdown cannot be set: by what amount and what kind of lenses (optical systems) was obtained such an image (form trace laser breakdown). On Fig presents a scheme with two lenses: one pulse of laser radiation 15 after the expansion of the beam telescope 16 is divided by the beam splitter 17 into two runanalysis beam. The first lens 18 forms an angle beam +(plus) 1 is pleased through svetomuzykalny block 19 in the material marked details 20 the next image in the form the corresponding figure 3. The second lens 21 by mirrors 22, 23 forms an angle beam -(minus) 1 deg through svetomuzykalny block 19 in the same or similar geometric location marked with the details of the next image in the form corresponding to figure 4 (first symmetric about the horizontal axis). Form the point of laser breakdown is complex in structure and correspond to the energy sum of the impacts from the two lenses.

Structural optical corrector may be made in the form of a plane-parallel plate having zones of optical inhomogeneity. Here is the simplest case of heterogeneity (Fig). Let the thickness of the plane-parallel glass 24 is equal to N; and the glass in the mass, except for the middle section, is homogeneous and has a refractive index n; let the middle portion is also homogeneous, but has a refractive index n+Δn and Δn is small compared to n. If the glass falls off radiation in the form of a plane wave 25, the output of the glass wave 26 acquires a dent with a flat bottom; the depth of this indentation, i.e. the wave aberration h waves, strain heterogeneity, will be equal to

h=HΔn.

Provided that h>0,25λ, there are distortions in the diffraction image of a point, and when the magnitude of distortions passing wavefront significant percentage of energy transfer is the CIO of the Central core of the image in the surrounding “tails”. Let us explain this with an example (see Fig). Let the glass 27 is enclosed heterogeneity 28, occupying 10% of the area of the glass and situated straightforward. On Fig shows the image point, built optical system lens + this glass. In this case, the image points are “tails”, oriented in the direction perpendicular to the direction of inhomogeneity. The higher the value Δn, and with it the h, the more these “tails” are increased, the latter acquires a sufficient portion of the energy for the formation of such a view point of the laser breakdown. Obtaining sufficient heterogeneity in the glass in the glass melting process, and artificial way. For example, zone 27 (Fig) is made of one of glass, and the area 28 from the other, having other zones 27 of the glass refractive index. Or, the entire plate is made of one of glass, but the area 27 in thickness along the axis of the less (more) zone 28 to the desired in each particular case size. This example shows the ability to influence the shape of the points of the zones of discontinuity of optical glass. To specify a different configuration areas inhomogeneities, which will change the shape of the point.

The optical system includes a beam splitting element, at least two lens and structural optical corrector placed between the beam splitter e is Eminem and one of the lenses.

As structural optical corrector can be applied diffraction, diffuse, slateblue, star and other special filters. The optical corrector may be both in static and dynamic condition. For example, rotating the corrector with different speeds, you can create a completely random distribution of points driven laser breakdown in the material volume of the product. You can also create managed simultaneous distribution point group breakdown for one laser pulse due to the use of different beam-splitting devices, for example, using a lens 29 and a multiplier of prisms 30 (Fig).

You can increase the size breakdown of the axes X and Y while maintaining the minimum axial dimensions. This allows for a limited number of breakdowns to perform well readable characters (numbers, letters, icons). When using the minimum along all three coordinate breakdowns for writing such similar characters with similar “vidrascu” you must use the number of breakdowns, which in quadratic dependence is greater than the size breakdown with adjustable break more than usual.

As a result of focusing of laser radiation through optical systems with specially tailored properties at discrete points in material (thicker material) is ri relative movement with respect to each other products and laser beam according to a given program using the computer would result in a new image consisting of managed laser optical breakdown. The identification of products of specific producers is achieved by a new type of managed (unlike unmanaged random) laser optical breakdown achieved through specially created for this purpose optical systems with desired properties, and structural optical corrector. Thus, the formation of lettering and/or logo of the manufacturer, consisting of a set of these breakdowns and may identify one or more predetermined optical breakdown when considering their unarmed or armed any suitable optical, opto-electronic, television or other sensing device.

Apparatus for forming an image inside a transparent or translucent materials for example flowchart Fig contains a laser 15 unit 31 of its management, power and cooling, structural, optical corrector 32, auxiliary telescopic system 33, an optical imaging unit 34 (position 15, 31-34 are an optical system for obtaining a controlled trace laser breakdown in the form of structurally controlled points), system security scan and/or positioning 35, the device 36 of the filing of the articles 20 in the area of the Fort is the planning image and the computer 37 software managing the process.

The optical system may include a variety of lenses, including the desired aberration correction, and/or structural optical correctors. An example of the optical system with structural corrector is presented in figure 1. Structural optical corrector may be a separate optical node, for example, in the form of a group of cylindrical lenses, which are described in detail in the method, the item with the optical heterogeneity, filters, special effects or its functions are performed by other optical system elements, such as lenses and/or telescopes with the desired aberration correction. The optical system may include at least one beam splitting element 29. If you turn this beam splitting element 29 (Fig) around the optical axis of the system in the process of drawing the image, you will get one of the possible examples of implementation of the dynamic changes in the relative position of the laser traces of breakdowns.

The device 36 of the filing of the articles 20 in the area of the marking can be made in the form of a conveyor mechanism and perform a conveyor feed products (marked items) in the treatment area. It also provides the desired positioning of the product relative to the optical system imaging and synchronization on the Ala marking with the time of arrival of the product at the desired position. The device 36 may provide the desired movement of the product during processing (e.g., rotation). Positioning and/or scanning functions can be performed and a separate system 35 of the positioning and/or scanning, working with the optical system and the device 36 supply and installation of the product 20 in the area of imaging, for example, to synchronize, specific provisions of the product with the pulses of breakdowns and/or movement of the structural elements of the optical corrector.

The product can be made partially or entirely of transparent or translucent material and contains made within a transparent or translucent material image formed different in shape and/or dimensions of the micro destructions received by the laser beam passing through the optical system. Different shape and/or size of the micro destructions are provided an optical system in accordance with the above-described method.

1. The method of forming an image within a transparent or translucent material, which consists in the fact that impinges on the material of the pulsed laser beam, having passed through the optical system, with the formation inside the material traces of optical laser breakdown, forming the image, wherein using the optical system forming the Taco is the energy distribution of the laser beam in its cross section, which produces a trace laser breakdown with a form other than a single ellipsoid.

2. The method according to claim 1, characterized in that in the process of forming images dynamically produce a change in the structure of the optical system with capability of obtaining traces of optical breakthroughs different forms, varying from pulse to pulse.

3. The method according to any one of claims 1 and 2, characterized in that use optical system configured to split the laser beam, at least two parts, and focusing the received rays at selected points within the material one marked product.

4. The method according to claim 1, wherein using the optical system, further comprising at least two cylindrical lenses, mounted in the same plane with the possibility of rotation, at least one of them in this plane in such a way that changes the angle between the generators of their cylindrical surfaces.

5. The method according to claim 1, wherein using the optical system, further comprising a plane-parallel transparent plate with an optical inhomogeneity.

6. The method according to claim 1, wherein using the optical system, further comprising at least one filter selected from the group: diffraction, diffuse, SHL is voobrazimoe, star or other.

7. The method according to claim 3, characterized in that at least one of the obtained after separation of the beams are placed with the opportunity to interact with an optical element that resembles in any of claims 4-6.

8. Apparatus for forming an image inside a transparent or translucent material containing a source of pulsed laser radiation and the optical system, characterized in that the optical system is arranged to generate energy distribution of the pulse laser beam in its cross section, providing forms of trace laser breakdown, other than a single ellipsoid.

9. The device according to claim 8, characterized in that the optical system configured to split the laser beam, at least two parts, and focusing the received rays at selected points within the material one marked product.

10. The device according to claim 8, wherein the optical system includes at least two cylindrical lenses, mounted in the same plane between the source of pulsed laser radiation and the lens, so that they form cylindrical surfaces arranged at an angle to each other.

11. The device according to claim 8, wherein the optical system includes at least two criticise whether the SHL, installed in the same plane between the source of pulsed laser radiation and a lens with a possibility of rotation in the plane with the angle between them forming cylindrical surfaces.

12. The device according to claim 8, wherein the optical system includes an installed between the source of pulsed laser radiation and the lens plane-parallel transparent plate with an optical inhomogeneity.

13. The device according to claim 8, wherein the optical system includes at least one filter selected from the group: diffraction, diffuse, slateblue, star or other.

14. The device according to claim 8, characterized in that the optical system is decentered.

15. The device according to claim 8, wherein the optical system includes a beam splitting element, at least two lens and structural optical corrector placed between the beam-splitting element and one of the lenses.

16. Products made partially or entirely of transparent or translucent material, having within the specified material image formed by the traces of the laser breakdown, characterized in that each trace laser breakdown has a shape other than a single ellipsoid.



 

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