CN111258199A - Realization method of reflective volume holography 3D anti-counterfeiting based on physical interference - Google Patents

Abstract

The invention discloses a realization method of reflective volume holography three-dimensional anti-counterfeiting based on physical interference. The device used in the method comprises sequentially arranged lasers, attenuators, beam expanders, diaphragms, collimating mirrors, and photopolymers. and a three-dimensional object; the method includes: controlling the laser to emit a monochromatic laser; reducing the illumination intensity of the monochromatic laser through an attenuating sheet; expanding the beam of the monochromatic laser after reducing the illumination intensity through a beam expander; the spot diameter of the monochromatic laser; the monochromatic laser after adjusting the spot diameter is collimated and adjusted by a collimating mirror to generate a plane wave; the plane light is incident on the photopolymer as a reference light; the incident light is controlled vertically Through the photopolymer, the object light is formed by reflection on the three-dimensional object; the interference of the reference light and the object light in the photopolymer is controlled to form a three-dimensional figure. The invention can form stable, real and clear three-dimensional graphics, thereby improving the anti-counterfeiting performance.

Description

Realization method of reflective volume holography 3D anti-counterfeiting based on physical interference

technical field

The invention relates to the field of volume holography anti-counterfeiting, and more particularly relates to a realization method of reflective volume holography three-dimensional anti-counterfeiting based on physical interference.

Background technique

At present, most commodities on the market need to use anti-counterfeiting technology. Anti-counterfeiting is an indispensable part of enterprise production, and it can even be said that it plays a crucial role. Commodity anti-counterfeiting is widely used in high-end equipment, tobacco and alcohol industry, coinage, luxury goods, clothing, medical equipment, pharmaceuticals, food, etc.

However, there are still some problems and demands in the current anti-counterfeiting technology. At present, the anti-counterfeiting trademarks on the market mainly use anti-counterfeiting codes, two-dimensional codes, and two-dimensional holographic patterns. Although the cost is low, due to the low technical complexity, they are easy to be cracked and counterfeited. Therefore, there is an urgent need for an anti-counterfeiting technology with high technical content, high anti-counterfeiting performance and high production efficiency. At present, the most widely used and high anti-counterfeiting effect on the market is holographic anti-counterfeiting. Traditional holographic anti-counterfeiting is an anti-counterfeiting technology based on two-dimensional patterns or pseudo 3D display, which is difficult to reproduce three-dimensional real graphics, and its imitation performance still needs to be improved.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a realization method of reflective volume holographic three-dimensional anti-counterfeiting based on physical interference.

In order to achieve the above object, the present invention adopts the following technical solutions: a realization method of reflective volume holographic three-dimensional anti-counterfeiting based on physical interference, the device adopted in the method comprises a laser, an attenuator, a beam expander, a diaphragm, a collimator arranged in sequence. Mirrors, photopolymers, and three-dimensional objects; the method includes:

Control the laser to emit monochromatic laser light;

Reduce the light intensity of the monochromatic laser through the attenuation sheet;

Expand the monochromatic laser after reducing the light intensity through a beam expander;

Adjust the spot diameter of the expanded monochromatic laser through the diaphragm;

The monochromatic laser after adjusting the spot diameter is collimated and adjusted by a collimating mirror to generate a plane wave;

Incident plane light on the photopolymer as a reference light;

Control the incident light to pass through the photopolymer vertically, and reflect on the three-dimensional object to form object light;

Control the interference of the reference light and the object light in the photopolymer to form a three-dimensional pattern.

Its further technical scheme is: the laser is a red laser, a green laser or a blue laser.

Its further technical scheme is as follows: the surface of the three-dimensional object is sprayed with a nano-coating with high reflectivity.

Its further technical scheme is: the device used in the method further includes an electronic shutter; the electronic shutter is arranged behind the attenuator to control the opening and closing of the monochromatic laser and the duration of the opening and closing.

The realization method of reflective volume holography three-dimensional anti-counterfeiting based on physical interference, the device used in the method includes laser, attenuator, half-wave plate, polarizing beam splitter, light blocking plate, beam expander, diaphragm, collimating mirror, photoelectric Polymer and three-dimensional object; the laser, attenuator, half-wave plate, polarizing beam splitter, beam expander, diaphragm, collimating mirror, photopolymer and three-dimensional object are arranged in sequence, and the light blocking plate is located in the above the polarizing beam splitter; the method includes:

Control the laser to emit monochromatic laser light;

Reduce the light intensity of the monochromatic laser through the attenuation sheet;

Change the ratio of TM polarized light and TE polarized light in the monochromatic laser after reducing the illumination intensity by rotating the half-wave plate;

The monochromatic laser is divided into TM polarized light and TE polarized light by a polarizing beam splitter; wherein, the polarization directions of TM polarized light and TE polarized light are perpendicular to each other;

The TE polarized light is blocked by the baffle, and the TM polarized light is emitted to the beam expander;

Expand the TM polarized light through a beam expander;

Adjust the spot diameter of the expanded TM polarized light through the diaphragm;

The TM polarized light after adjusting the spot diameter is collimated and adjusted by a collimating lens to generate plane waves;

Incident plane light on the photopolymer as a reference light;

Control the incident light to pass through the photopolymer vertically, and reflect on the three-dimensional object to form object light;

Control the interference of the reference light and the object light in the photopolymer to form a three-dimensional pattern.

Its further technical scheme is: the laser is a red laser, a green laser or a blue laser.

Its further technical scheme is as follows: the surface of the three-dimensional object is sprayed with a nano-coating with high reflectivity.

Its further technical scheme is: the device used in the method further includes an electronic shutter; the electronic shutter is arranged behind the attenuator to control the opening and closing of the monochromatic laser and the duration of the opening and closing.

Compared with the prior art, the beneficial effects of the present invention are: the realization method of the reflective volume holographic three-dimensional anti-counterfeiting based on physical interference provided by the present invention, through the laser, attenuator, electronic shutter, half-wave plate, polarization beam splitter, Light baffles, beam expanders, diaphragms, collimating mirrors, photopolymers, three-dimensional objects, using single-beam laser reflection volume holography to record the interference of three-dimensional objects, forming a stable, real and clear in the photopolymer. Three-dimensional graphics, thereby improving anti-counterfeiting performance.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented in accordance with the content of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following A preferred embodiment is given, and the detailed description is as follows.

Description of drawings

FIG. 1 is a flowchart of Embodiment 1 of a method for implementing reflective volume holographic three-dimensional anti-counterfeiting based on physical interference according to the present invention;

2 is a schematic diagram of the optical path structure of Embodiment 1 of the implementation method of the reflective volume holographic three-dimensional anti-counterfeiting based on physical interference according to the present invention;

FIG. 3 is a flowchart of Embodiment 2 of a method for implementing reflective volume holographic three-dimensional anti-counterfeiting based on physical interference according to the present invention;

FIG. 4 is a schematic diagram of the optical path structure of Embodiment 2 of the implementation method of the reflective volume holographic three-dimensional anti-counterfeiting based on physical interference according to the present invention.

reference number

Reference signs of Example 1: 1. Laser; 2. Attenuator; 3. Electronic shutter; 4. Beam expander; 5. Aperture; 6. Collimator; 7. Photopolymer; ; 9. Half-wave plate; 10. Polarizing beam splitter; 11. Light baffle.

Reference symbols of the second embodiment: 1. Laser; 2. Attenuator; 3. Electronic shutter; 4. Beam expander; 5. Aperture; 6. Collimator; 7. Photopolymer; .

Detailed ways

In order to more fully understand the technical content of the present invention, the technical solutions of the present invention are further introduced and described below with reference to specific embodiments, but are not limited thereto.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore It should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it may be a connection or a detachable connection, It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, reference to description of the terms "one embodiment," "some embodiments," "example," "specific example," "or "some examples," etc., means specific details described in connection with the embodiment or example. Features, structures, materials or characteristics are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above-mentioned terms should not be construed as necessarily aiming at the same embodiment or example. Moreover, describe The specific features, structures, materials or characteristics of the device can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification. combination.

Example 1

The present invention provides a method for realizing three-dimensional anti-counterfeiting reflective volume holography based on physical interference. Please refer to FIGS. 1 and 3 . The device used in this method includes a laser 1 , an attenuating plate 2 , a half-wave plate 9 , and a polarizing beam splitter 10 , light blocking plate 11, beam expander 4, diaphragm 5, collimating mirror 6, photopolymer 7 and three-dimensional object 8; laser 1, attenuation plate 2, half-wave plate 9, polarizing beam splitter 10, beam expander 4 , diaphragm 5, collimating mirror 6, photopolymer 7 and three-dimensional object 8 are arranged in sequence, and the light blocking plate 11 is located above the polarizing beam splitter 10; the method includes the following steps:

S100, controlling the laser 1 to emit a monochromatic laser;

S101, reducing the light intensity of the monochromatic laser through the attenuation sheet 2;

S102, changing the ratio of the TM polarized light and the TE polarized light in the monochromatic laser after reducing the illumination intensity by rotating the half-wave plate 9;

S103, dividing the monochromatic laser light into TM polarized light and TE polarized light by polarizing beam splitter 10; wherein, the polarization directions of TM polarized light and TE polarized light are perpendicular to each other;

S104, blocking the TE polarized light by the light blocking plate 11, and making the TM polarized light emitted to the beam expander 4;

S105, expanding the TM polarized light through the beam expander 4;

S106, adjusting the spot diameter of the expanded TM polarized light through aperture 5;

S107, collimating and adjusting the TM polarized light after adjusting the spot diameter through the collimating mirror 6 to generate a plane wave;

S108, the plane light is incident on the photopolymer 7 as reference light;

S109, controlling the incident light to pass through the photopolymer 7 vertically, and reflect on the three-dimensional object 8 to form object light;

S110. Control the interference of the reference light and the object light in the photopolymer 7 to form a three-dimensional pattern.

Specifically, in step S100 , the laser 1 may select a red laser 1 , a green laser 1 or a blue laser 1 . In step S103, TE represents transverse electric wave, TM represents transverse magnetic wave, and both TM polarized light and TE polarized light are linearly polarized light. In addition, the three-dimensional object 8 is a three-dimensional structure or the surface has a three-dimensional morphology; in this embodiment, a nano-coating with high reflectivity is sprayed on the surface of the three-dimensional object 8 , and the function of the coating is to increase the reflection of the three-dimensional object 8 In this way, the intensity of the object light is increased, so that the ratio of the object light and the reference light is equal, thereby improving the diffraction efficiency. The photopolymer 7 is used to generate the volume holographic grating structure, and has high diffraction efficiency without wet or chemical treatment. Preferably, the photopolymer 7 is Bayfol HX200 from Covestro.

In some embodiments, such as in this embodiment, the device used in the method further includes an electronic shutter; the electronic shutter is arranged behind the attenuator 2 to control the opening and closing of the monochromatic laser and the opening and closing of the electronic shutter. length of time closed.

Laser 1, attenuation plate 2, electronic shutter, half-wave plate 9, polarizing beam splitter 10, light blocking plate 11, beam expander 4, diaphragm 5, collimating mirror 6, photopolymer 7, three-dimensional object 8 , using single-beam laser reflection type volume holography to perform interference recording on the three-dimensional object 8, and form a stable, real and clear three-dimensional figure in the photopolymer 7, thereby improving the anti-counterfeiting performance. In addition, by adding a nano-coating on the surface of the three-dimensional object 8 to increase the reflectivity, the intensity of the object light is increased, so that the ratio of the object light and the reference light is equal, thereby improving the diffraction efficiency, and the photopolymer can be directly observed with the naked eye. 3D graphics in 7 materials.

Embodiment 2

The present invention also provides a method for realizing reflective volume holography three-dimensional anti-counterfeiting based on physical interference. Compared with the first embodiment, the method simplifies the optical path structure, that is, the optical path structure removes the half-wave plate, polarizing beam splitter and light blocking plate. usage of. Specifically, please refer to FIGS. 2 and 4. The device used in this method includes a laser 1, an attenuator 2, a beam expander 4, a diaphragm 5, a collimating mirror 6, a photopolymer 7 and a three-dimensional object arranged in sequence. 8; the method includes the steps:

S10, control the laser 1 to emit a monochromatic laser;

S20, reducing the light intensity of the monochromatic laser through the attenuation sheet 2;

S30, expand the monochromatic laser beam after reducing the light intensity through the beam expander 4;

S40, adjusting the spot diameter of the monochromatic laser beam after the beam expansion through the diaphragm 5;

S50, collimating and adjusting the monochromatic laser after adjusting the spot diameter through the collimating mirror 6 to generate a plane wave;

S60, the plane light is incident on the photopolymer 7 as reference light;

S70, controlling the incident light to pass through the photopolymer 7 vertically, and reflect on the three-dimensional object 8 to form object light;

S80. Control the interference of the reference light and the object light in the photopolymer 7 to form a three-dimensional pattern.

Specifically, in step S10 , the laser 1 may select a red laser 1 , a green laser 1 or a blue laser 1 . In addition, the three-dimensional object 8 is a three-dimensional structure or the surface has a three-dimensional morphology; in this embodiment, a nano-coating with high reflectivity is sprayed on the surface of the three-dimensional object 8 , and the function of the coating is to increase the reflection of the three-dimensional object 8 In this way, the intensity of the object light is increased, so that the ratio of the object light and the reference light is equal, thereby improving the diffraction efficiency. The photopolymer 7 is used to generate the volume holographic grating structure, and has high diffraction efficiency without wet or chemical treatment. Preferably, the photopolymer 7 is Bayfol HX200 from Covestro.

In some embodiments, such as in this embodiment, the device used in the method further includes an electronic shutter; the electronic shutter is arranged behind the attenuator 2 to control the opening and closing of the monochromatic laser and the opening and closing of the electronic shutter. length of time closed.

Through the laser 1, the attenuation plate 2, the electronic shutter, the beam expander 4, the diaphragm 5, the collimating mirror 6, the photopolymer 7, and the three-dimensional object 8, the single-beam laser reflection volume holography is used to perform the three-dimensional object 8. Interferometric recording, a stable, true and clear three-dimensional pattern is formed in the photopolymer 7, thereby improving the anti-counterfeiting performance. In addition, by adding a nano-coating on the surface of the three-dimensional object 8 to increase the reflectivity, the intensity of the object light is increased, so that the ratio of the object light and the reference light is equal, thereby improving the diffraction efficiency, and the photopolymer can be directly observed with the naked eye. 3D graphics in 7 materials.

The above only uses examples to further illustrate the technical content of the present invention, so that readers can understand it more easily, but it does not mean that the embodiments of the present invention are limited to this. Any technical extension or re-creation made according to the present invention is subject to the protection of. The protection scope of the present invention is subject to the claims.

Claims (8)

1. The method for realizing the three-dimensional anti-counterfeiting of the reflective volume hologram based on the physical interference is characterized in that a device adopted by the method comprises a laser, an attenuation sheet, a beam expanding lens, a diaphragm, a collimating lens, a photopolymer and a three-dimensional physical object which are sequentially arranged; the method comprises the following steps:

controlling a laser to emit monochromatic laser;

the illumination intensity of the monochromatic laser is reduced through the attenuation sheet;

expanding the beam of the monochromatic laser after the illumination intensity is reduced by a beam expander;

adjusting the spot diameter of the expanded monochromatic laser through a diaphragm;

the monochromatic laser after the diameter of the light spot is adjusted is collimated and adjusted through a collimating mirror to generate plane waves;

incident a planar light on the photopolymer as a reference light;

controlling incident light to vertically penetrate through the photopolymer and reflect on the three-dimensional object to form object light;

the control reference light and the object light interfere at the photopolymer to form a three-dimensional pattern.

2. The method for realizing the three-dimensional anti-counterfeiting reflective volume hologram based on the physical interference according to claim 1, wherein the laser is a red laser, a green laser or a blue laser.

3. The method for realizing the three-dimensional anti-counterfeiting of the reflective volume hologram based on the physical interference according to claim 1, wherein the surface of the three-dimensional physical object is sprayed with a high-reflectivity nano-coating.

4. The method for realizing the three-dimensional anti-counterfeiting by the reflective volume hologram based on the physical interference according to the claim 1, characterized in that the adopted device further comprises an electronic shutter; the electronic shutter is arranged behind the attenuation sheet and used for controlling the opening and closing of the monochromatic laser and the opening and closing time of the monochromatic laser.

5. The method for realizing the three-dimensional anti-counterfeiting of the reflective volume hologram based on the physical interference is characterized in that a device adopted by the method comprises a laser, an attenuation plate, a half-wave plate, a polarizing beam splitter, a light barrier, a beam expanding lens, a diaphragm, a collimating lens, a photopolymer and a three-dimensional physical object; the laser, the attenuation plate, the half-wave plate, the polarizing beam splitter, the beam expander, the diaphragm, the collimating lens, the photopolymer and the three-dimensional object are arranged in sequence, and the light barrier is positioned above the polarizing beam splitter; the method comprises the following steps:

controlling a laser to emit monochromatic laser;

the illumination intensity of the monochromatic laser is reduced through the attenuation sheet;

the ratio of TM polarized light to TE polarized light in the monochromatic laser after the illumination intensity is reduced is changed by rotating the half-wave plate;

dividing the monochromatic laser into TM polarized light and TE polarized light by a polarization beam splitter; wherein, the polarization directions of the TM polarized light and the TE polarized light are mutually vertical;

blocking the TE polarized light by a light barrier, and transmitting TM polarized light to a beam expander;

expanding the TM polarized light by a beam expander;

adjusting the spot diameter of expanded TM polarized light through a diaphragm;

collimating and adjusting the TM polarized light after the diameter of the light spot is adjusted through a collimating mirror to generate plane waves;

incident a planar light on the photopolymer as a reference light;

controlling incident light to vertically penetrate through the photopolymer and reflect on the three-dimensional object to form object light;

the control reference light and the object light interfere at the photopolymer to form a three-dimensional pattern.

6. The method for realizing the three-dimensional anti-counterfeiting reflective volume hologram according to claim 5, wherein the laser is a red laser, a green laser or a blue laser.

7. The method for realizing the three-dimensional anti-counterfeiting reflective volume hologram based on the physical interference according to claim 5, wherein the surface of the three-dimensional physical object is sprayed with a high-reflectivity nano-coating.

8. The method for realizing the three-dimensional anti-counterfeiting by the reflective volume hologram based on the physical interference according to the claim 5, characterized in that the adopted device further comprises an electronic shutter; the electronic shutter is arranged behind the attenuation sheet and used for controlling the opening and closing of the monochromatic laser and the opening and closing time of the monochromatic laser.

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