CN111258199A - Method for realizing reflective volume holographic three-dimensional anti-counterfeiting based on physical interference - Google Patents
Method for realizing reflective volume holographic three-dimensional anti-counterfeiting based on physical interference Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005286 illumination Methods 0.000 claims abstract description 14
- 230000004888 barrier function Effects 0.000 claims description 13
- 238000002310 reflectometry Methods 0.000 claims description 10
- 239000002103 nanocoating Substances 0.000 claims description 8
- 230000010287 polarization Effects 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 2
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- 238000001093 holography Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/0005—Adaptation of holography to specific applications
- G03H1/0011—Adaptation of holography to specific applications for security or authentication
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/0005—Adaptation of holography to specific applications
- G03H1/0011—Adaptation of holography to specific applications for security or authentication
- G03H2001/0016—Covert holograms or holobjects requiring additional knowledge to be perceived, e.g. holobject reconstructed only under IR illumination
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
- G03H2001/0428—Image holography, i.e. an image of the object or holobject is recorded
Abstract
The invention discloses a method for realizing reflective volume holographic three-dimensional anti-counterfeiting based on physical interference, which adopts a device comprising a laser, an attenuation sheet, a beam expanding lens, a diaphragm, a collimating lens, a photopolymer and a three-dimensional physical 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. The invention can form stable, real and clear three-dimensional figures, thereby improving the anti-counterfeiting performance.
Description
Technical Field
The invention relates to the field of volume holographic anti-counterfeiting, in particular to a method for realizing reflection type volume holographic three-dimensional anti-counterfeiting based on physical interference.
Background
At present, most of commodities on the market need to use an anti-counterfeiting technology, and the anti-counterfeiting technology is an essential link for enterprise production and even plays a crucial role. Merchandise security is widely used in high-end equipment, the tobacco and wine industry, the coinage industry, luxury goods, clothing, medical equipment, pharmaceuticals, food, and the like.
However, there are some problems and needs in the current anti-counterfeiting technology. At present, anti-counterfeiting trademarks on the market mainly adopt anti-counterfeiting codes, two-dimensional codes and two-dimensional holographic patterns, and although the cost is low, the anti-counterfeiting trademarks are easy to crack and counterfeit due to low technical complexity. Therefore, there is a need for an anti-counterfeiting technology with high technical content, high anti-counterfeiting performance and high production efficiency. The holographic anti-counterfeiting paper has the widest application and higher anti-counterfeiting effect in the market at present. The traditional holographic anti-counterfeiting technology is based on two-dimensional patterns or pseudo 3D display, three-dimensional real graphs are difficult to reproduce, and the imitation performance of the traditional holographic anti-counterfeiting technology still needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for realizing reflective volume holographic three-dimensional anti-counterfeiting based on physical interference.
In order to achieve the purpose, the invention adopts the following technical scheme: the method for realizing the reflective volume holographic three-dimensional anti-counterfeiting based on physical interference comprises the following steps 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 body 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.
The further technical scheme is as follows: the laser is a red laser, a green laser or a blue laser.
The further technical scheme is as follows: and the surface of the three-dimensional object is sprayed with a high-reflectivity nano coating.
The further technical scheme is as follows: the device adopted by the method also 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.
The method for realizing the reflective volume holographic three-dimensional anti-counterfeiting based on physical interference comprises the following steps that a device adopted by the method comprises a laser, an attenuation plate, a half-wave plate, a polarization beam splitter, a light barrier, a beam expander, a diaphragm, a collimating mirror, 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.
The further technical scheme is as follows: the laser is a red laser, a green laser or a blue laser.
The further technical scheme is as follows: and the surface of the three-dimensional object is sprayed with a high-reflectivity nano coating.
The further technical scheme is as follows: the device adopted by the method also 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.
Compared with the prior art, the invention has the beneficial effects that: according to the method for realizing the reflective volume hologram three-dimensional anti-counterfeiting based on the physical interference, the single-beam laser reflective volume hologram is used for carrying out interference recording on the three-dimensional physical object through the arranged laser, the attenuation plate, the electronic shutter, the half-wave plate, the polarizing beam splitter, the light barrier, the beam expanding lens, the diaphragm, the collimating lens, the photopolymer and the three-dimensional physical object, so that a stable, real and clear three-dimensional graph is formed in the photopolymer, and the anti-counterfeiting performance is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more apparent, the following detailed description will be given of preferred embodiments.
Drawings
FIG. 1 is a flow chart of a first embodiment of a method for realizing a reflective volume holographic three-dimensional anti-counterfeiting based on physical interference according to the present invention;
FIG. 2 is a schematic diagram of an optical path structure of a first implementation method of the reflective volume holographic three-dimensional anti-counterfeiting based on physical interference according to the present invention;
FIG. 3 is a flow chart of a second embodiment of the method for implementing the reflective volume holographic three-dimensional anti-counterfeiting based on physical interference according to the present invention;
fig. 4 is a schematic diagram of an optical path structure of a second implementation method of the reflective volume holographic three-dimensional anti-counterfeiting based on physical interference.
Reference numerals
Reference numerals of the first embodiment: 1. a laser; 2. an attenuation sheet; 3. an electronic shutter; 4. a beam expander; 5. a diaphragm; 6. a collimating mirror; 7. a photopolymer; 8. a three-dimensional entity; 9. a half-wave plate; 10. a polarizing beam splitter; 11. a light barrier.
Reference numerals of example two: 1. a laser; 2. an attenuation sheet; 3. an electronic shutter; 4. a beam expander; 5. a diaphragm; 6. a collimating mirror; 7. a photopolymer; 8. and (3) three-dimensional real objects.
Detailed Description
In order to more fully understand the technical content of the present invention, the technical solution of the present invention will be further described and illustrated with reference to the following specific embodiments, but not limited thereto.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," some embodiments, "" an example, "" a specific example, "" or "some examples," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
Example one
The invention provides a method for realizing reflective volume holographic three-dimensional anti-counterfeiting based on physical interference, please refer to fig. 1 and 3, the device adopted by the method comprises a laser 1, an attenuation plate 2, a half-wave plate 9, a polarization beam splitter 10, a light barrier 11, a beam expander 4, a diaphragm 5, a collimating mirror 6, a photopolymer 7 and a three-dimensional physical object 8; the laser 1, the attenuation plate 2, the half-wave plate 9, the polarizing beam splitter 10, the beam expander 4, the diaphragm 5, the collimating lens 6, the photopolymer 7 and the three-dimensional object 8 are sequentially arranged, and the light barrier 11 is positioned above the polarizing beam splitter 10; the method comprises the following steps:
s100, controlling the laser 1 to emit monochromatic laser;
s101, reducing the illumination intensity of the monochromatic laser through the attenuation sheet 2;
s102, changing the proportion of TM polarized light and TE polarized light in the monochromatic laser after the illumination intensity is reduced by rotating the half-wave plate 9;
s103, dividing the monochromatic laser into TM polarized light and TE polarized light by the polarization beam splitter 10; wherein, the polarization directions of the TM polarized light and the TE polarized light are mutually vertical;
s104, blocking the TE polarized light through the light barrier 11, and transmitting the TM polarized light to the beam expander 4;
s105, expanding the TM polarized light through a beam expander 4;
s106, adjusting the spot diameter of expanded TM polarized light through the diaphragm 5;
s107, collimating and adjusting the TM polarized light after the diameter of the light spot is adjusted through a collimating mirror 6 to generate plane waves;
s108, enabling the plane light to be incident on the photopolymer 7 to be used as reference light;
s109, controlling incident light to vertically penetrate through the photopolymer 7 and reflect on the three-dimensional object 8 to form object light;
and S110, controlling the reference light and the object light to interfere 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 denotes a transverse electric wave, TM denotes a transverse magnetic wave, and both TM polarized light and TE polarized light are linearly polarized light. In addition, the three-dimensional object 8 has a three-dimensional structure or the surface has three-dimensional appearance; in this embodiment, a high-reflectivity nano-coating is sprayed on the surface of the three-dimensional object 8, and the coating serves to increase the reflectivity of the three-dimensional object 8, so as to improve the intensity of the object light, make the ratio of the object light to the reference light equal, and further improve the diffraction efficiency. Photopolymer 7 is used to create volume holographic grating structures with high diffraction efficiency without wet or chemical treatment, preferably photopolymer 7 model Covestro Bayfol HX 200.
In some embodiments, such as the present embodiment, the method employs an apparatus further comprising an electronic shutter; the electronic shutter is arranged behind the attenuation sheet 2 and used for controlling the opening and closing of the monochromatic laser and the opening and closing time of the monochromatic laser.
By the aid of the laser 1, the attenuation sheet 2, the electronic shutter, the half-wave plate 9, the polarizing beam splitter 10, the light barrier 11, the beam expander 4, the diaphragm 5, the collimating mirror 6, the photopolymer 7 and the three-dimensional real object 8, interference recording is carried out on the three-dimensional real object 8 through single-beam laser reflection type volume holography, a stable, real and clear three-dimensional graph is formed in the photopolymer 7, and accordingly anti-counterfeiting performance is improved. In addition, the nano coating is added on the surface of the three-dimensional object 8, so that the reflectivity is improved, the intensity of the object light is improved, the proportion of the object light to the reference light is equivalent, the diffraction efficiency is further improved, and the three-dimensional pattern in the photopolymer 7 material can be directly observed by naked eyes.
Example two
Compared with the embodiment, the method simplifies the light path structure, namely the light path structure eliminates the use of a half-wave plate, a polarizing beam splitter and a light barrier. Specifically, referring to fig. 2 and 4, the device used in the method includes a laser 1, an attenuation sheet 2, a beam expander 4, a diaphragm 5, a collimator lens 6, a photopolymer 7, and a three-dimensional object 8, which are sequentially arranged; the method comprises the following steps:
s10, controlling the laser 1 to emit monochromatic laser;
s20, reducing the illumination intensity of the monochromatic laser through the attenuation sheet 2;
s30, expanding the monochromatic laser after the illumination intensity is reduced through the beam expander 4;
s40, adjusting the spot diameter of the expanded monochromatic laser through the diaphragm 5;
s50, collimating and adjusting the monochromatic laser after the diameter of the light spot is adjusted through a collimating mirror 6 to generate plane waves;
s60, incident a plane light on the photopolymer 7 as a reference light;
s70, controlling the incident light to vertically penetrate through the photopolymer 7 and reflect on the three-dimensional object 8 to form object light;
s80, the control reference light and the object light interfere at the photopolymer 7 to form a three-dimensional pattern.
Specifically, in step S10, the laser 1 may select the red laser 1, the green laser 1, or the blue laser 1. In addition, the three-dimensional object 8 has a three-dimensional structure or the surface has three-dimensional appearance; in this embodiment, a high-reflectivity nano-coating is sprayed on the surface of the three-dimensional object 8, and the coating serves to increase the reflectivity of the three-dimensional object 8, so as to improve the intensity of the object light, make the ratio of the object light to the reference light equal, and further improve the diffraction efficiency. Photopolymer 7 is used to create volume holographic grating structures with high diffraction efficiency without wet or chemical treatment, preferably photopolymer 7 model Covestro Bayfol HX 200.
In some embodiments, such as the present embodiment, the method employs an apparatus further comprising an electronic shutter; the electronic shutter is arranged behind the attenuation sheet 2 and used for controlling the opening and closing of the monochromatic laser and the opening and closing time of the monochromatic laser.
By the aid of the laser 1, the attenuation sheet 2, the electronic shutter, the beam expander 4, the diaphragm 5, the collimating lens 6, the photopolymer 7 and the three-dimensional real object 8, the three-dimensional real object 8 is subjected to interference recording by means of single-beam laser reflection type volume holography, a stable, real and clear three-dimensional graph is formed in the photopolymer 7, and accordingly anti-counterfeiting performance is improved. In addition, the nano coating is added on the surface of the three-dimensional object 8, so that the reflectivity is improved, the intensity of the object light is improved, the proportion of the object light to the reference light is equivalent, the diffraction efficiency is further improved, and the three-dimensional pattern in the photopolymer 7 material can be directly observed by naked eyes.
The technical contents of the present invention are further illustrated by the examples only for the convenience of the reader, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation based on the present invention is protected by the present invention. The protection scope of the 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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| CN109643081A (en) * | 2016-06-03 | 2019-04-16 | 史丹斯伯格公司 | Metallization includes the method for the optical element of surface relief structure |
| CN209297626U (en) * | 2018-10-09 | 2019-08-23 | 深圳市深大极光科技有限公司 | A kind of device for producing volume holographic anti-counterfeiting mark in batches |
| CN110286575A (en) * | 2019-07-19 | 2019-09-27 | 深圳市金质金银珠宝检验研究中心有限公司 | The implementation method of full color volume holographic anti-counterfeiting technology based on DMD |
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