Point light source reading laser encrypted paper anti-counterfeiting label and preparation method thereof

Abstract

The present invention relates to the field of anti-counterfeiting technology products, and specifically to a point light source readable laser encrypted paper anti-counterfeiting label and a preparation method thereof. The anti-counterfeiting label comprises a laser encrypted information layer, a copy layer, a composite adhesive layer, a printing layer, a paper layer, a pressure-sensitive adhesive layer and a silicone oil paper layer arranged in sequence from top to bottom, and the laser encrypted information layer contains hidden information, and the hidden information is revealed under a point light source. The point light source readable laser encrypted paper anti-counterfeiting label of the present invention is provided with a laser encrypted information layer, and a digital coding information grating structure is hidden in the laser encrypted information layer. Under natural light, the encrypted information is hidden, and a handheld point light source device is used to illuminate the surface of the label to present the hidden information. Consumers can identify the hidden information and judge the authenticity of the product, which is convenient for consumers to check the authenticity; encryption is performed through a mathematical algorithm, and the anti-counterfeiting strength is high, and it is not easy to be cracked and forged, which increases the difficulty of imitation; the preparation method of the present invention is scientific, reasonable, simple and easy.

Description

Technical Field

[0001] The present invention relates to the field of anti-counterfeiting technology products, and in particular to a point light source readable laser encrypted paper anti-counterfeiting mark and a preparation method thereof. Background Art

[0002] At present, in order to prevent their products from being counterfeited, various commodity manufacturers have used anti-counterfeiting labels. Laser anti-counterfeiting labels are increasingly being promoted and applied in combating counterfeit and inferior goods, protecting the interests of consumers, protecting the interests of producers of "famous, high-quality, and special" goods, and protecting the interests of various intellectual property rights.

[0003] Laser embossed holographic anti-counterfeiting technology was introduced into my country in the late 1980s and early 1990s, especially from 1990 to 1994, when hundreds of production lines were introduced across the country, accounting for more than half of the world's manufacturers at the time. In the early days of its introduction, this anti-counterfeiting technology did play a certain role in anti-counterfeiting, but as time went on, laser holographic image production technology spread rapidly, and now it has been cracked by counterfeiters from all aspects, and has almost completely lost its anti-counterfeiting ability, prompting people to start seeking to improve existing technologies. As a result, optical image coding encryption technologies such as laser reading, optical micro-reduction, low-frequency lithography, random interference fringes, moiré fringes, etc. are used. All of the above technologies require professional testing equipment to identify the authenticity, so many consumers cannot use the above anti-counterfeiting features to distinguish the authenticity, which is not conducive to market promotion.

[0004] The Chinese patent discloses an anti-transfer anti-counterfeiting label with a laser holographic plastic film. Specifically, the anti-transfer anti-counterfeiting label with a laser holographic plastic film is molded with laser holographic information on the plastic film. It includes a base paper layer, a glue layer, a plastic film layer, a first varnish layer and a surface printing layer. However, the label adopts ordinary holographic anti-counterfeiting, which is easy to be cracked and forged. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a point light source readable laser encrypted paper anti-counterfeiting label, which contains a laser encrypted information layer. Under natural light, the encrypted information is hidden, and under the illumination of a point light source device, the hidden information is presented, which is convenient for consumers to check the authenticity. The anti-counterfeiting strength is high and it is not easy to be cracked and forged. The present invention also provides a preparation method thereof, which is scientific, reasonable, simple and easy to implement.

[0006] The present invention is achieved through the following technical solutions:

[0007] The point light source for reading laser-encrypted paper anti-counterfeiting labels comprises a laser-encrypted information layer, a copy layer, a composite adhesive layer, a printing layer, a paper layer, a pressure-sensitive adhesive layer and a silicone oil paper layer which are arranged in sequence from top to bottom. The laser-encrypted information layer contains hidden information, and the hidden information is revealed under the point light source.

[0008] The laser encrypted information layer hides digital coded information.

[0009] The laser encrypted information layer is formed by copy transfer.

[0010] The hidden information of the laser encrypted information layer includes words, letters, numbers, symbols or graphics, which can be one or more of them.

[0011] The hidden information of the laser encrypted information layer is composed of a plurality of square grating lattice arrays, which are processed by laser etching. The grating lattice contains two parameters: grating space frequency and grating angle.

[0012] The laser encrypted information cannot be observed under normal circumstances, but can be seen under the flashlight on a mobile phone, and the holographic information seen changes from small to large as the distance of the light source increases.

[0013] The replication layer is UV varnish which can replicate holographic patterns.

[0014] The thickness of the replication layer is 4-6 μm, and the replication layer can be completely peeled off from the laser encryption information layer, and the peeling strength is 0.04-0.09 kN / m.

[0015] The paper layer has a grammage of 50-80 grams per square meter.

[0016] The method for preparing a point light source for reading a laser-encrypted paper anti-counterfeiting mark of the present invention comprises the following steps:

[0017] 1) Select a PET base film with a single-sided corona of 12-50 μm thickness, and coat the corona surface with a permanent imaging layer, which cannot be separated from the PET film;

[0018] 2) Production of laser encrypted information layer embossing plate:

[0019] First, a hidden pattern is made, and the hidden pattern is placed in a polar coordinate system. According to a systematic sampling method, N (N=n*n) pixels are randomly selected, where n≥4. The distance ρ and the angle θ from each pixel to the zero point of the coordinate system are calculated respectively. According to the distance from each pixel to the zero point of the coordinate system, an n*n matrix is ​​obtained, and finally a space-frequency grayscale image matrix G is obtained; according to the angle from each pixel to the zero point of the coordinate system, an n*n matrix is ​​obtained, and finally an angle grayscale image matrix H is obtained. According to the space-frequency grayscale image matrix G and the angle grayscale image matrix H, the plate making work of the laser encryption information mold layer is completed in the lithography machine to obtain a laser encryption information layer mold plate;

[0020] 3) using a molding machine to copy the laser encrypted information onto the permanent imaging layer to form a laser encrypted information layer;

[0021] 4) Apply UV varnish on the laser encrypted information layer to form a replica layer;

[0022] 5) Printing pictures, texts, QR codes and anti-counterfeiting features on the paper layer to form a printed layer;

[0023] 6) Compound the PET base film with the processed replica layer with the printed layer using composite glue, the dry coating amount of the composite glue is 7-10 g / m2, the drying temperature is 90-110°C, and the vehicle speed is 30-50 m / min;

[0024] 7) After the composite is firmly bonded, the PET base film and the permanent imaging layer are peeled off;

[0025] 8) Use a glue coating machine to apply glue on the non-printing surface of the paper layer and laminate it with the silicone oil paper;

[0026] 9) Use a die-cutting machine to die-cut into individual logos.

[0027] Preferably, the production of the laser encrypted information layer embossing plate specifically includes the following steps:

[0028] (1) According to the design file, a hidden pattern is made, a polar coordinate system is established, and the pattern is placed at the zero point in the polar coordinate system;

[0029] (2) The pattern resolution is a*b, and the pattern consists of a*b pixels. According to the systematic sampling method, N (N=n*n) pixels are randomly selected, where n≥4. The coordinates of each pixel are calculated using a computer (x1, y1), (x2, y2), (x3, y3), ... (x N ,y N ), and the distance between each pixel and the zero point (ρ1, ρ2, ρ3, ... ρ N );

[0030] (3) According to the polar coordinate system formula x = ρcosθ, y = ρcosθ, calculate the angle between each pixel and the zero point (θ1, θ1, θ1, ... θ N );

[0031] (4) L is the observation distance, which is a fixed parameter. β is the grating angle, d is the grating pitch, and λ is the laser wavelength. According to tanβ=ρ / L, β can be obtained. According to the grating equation sinβ=λ / d, the grating pitch d can be obtained. At this time, the two-dimensional parameters (d1, θ1), (d2, θ2), (d3, θ3)...(d N ,θ N );

[0032] (5) According to the grating pitch d of N grating lattices, a matrix can be obtained as follows:

[0033] d1, d2,……………………d n

[0034] d n+1 , d n+2 ,………………d 2*n

[0035] ………………………………

[0036] d n*(n-1)+1 , d n*(n-1)+2 , ...d n*n

[0037] Calculate the maximum value of d max and the minimum value d min , the minimum value corresponds to the grayscale value 0, and the maximum value corresponds to the grayscale value 255. According to this correspondence, the N values ​​of d can be mapped to another matrix G composed of grayscale values. This matrix constitutes a grayscale image, as follows:

[0038] G1, G2,……………………G n

[0039] G n+1 , G n+2 ,………………G 2*n

[0040] ………………………………

[0041] G n*(n-1)+1 , G n*(n-1)+2 , ... G n*n ;

[0042] (6) According to the angle θ of N grating lattices, a matrix can be obtained as follows:

[0043] θ1, θ2,……………………θ n

[0044] θ n+1 ,θ n+2 ,………………θ 2*n

[0045] ………………………………

[0046] θ n*(n-1)+1 ,θ n*(n-1)+2 , ...θ n*n

[0047] Calculate the maximum value of θ max and the minimum value θ min, the minimum value corresponds to the grayscale value 0, and the maximum value corresponds to the grayscale value 255. According to this correspondence, the N θ values ​​can be mapped to another matrix H composed of grayscale values. This matrix constitutes a grayscale image, as follows:

[0048] H1, H2,……………………H n

[0049] H n+1 , H n+2 ,………………H 2*n

[0050] ………………………………

[0051] H n*(n-1)+1 , H n*(n-1)+2 , ...H n*n ;

[0052] (7) According to the photolithography space-frequency grayscale matrix G and the grating angle grayscale matrix H, an exposure unit is manufactured. The size of the exposure unit is a square with a side length of n / R mm, where R is the resolution of the photolithography pattern, 10 dpi<R<50800 dpi;

[0053] (8) Arraying the exposure units in step (7) into a designed size, fabricating them on a photoresist plate through a photolithography process, and obtaining a laser encryption information layer mold plate after development and electroplating.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] 1. The point light source for reading laser-encrypted paper anti-counterfeiting labels described in the present invention is provided with a laser encryption information layer, in which a digital coding information grating structure is hidden. Under natural light, the encrypted information is hidden, and a handheld point light source device is used to illuminate the surface of the label to present the hidden information. Consumers can judge the authenticity of the product by identifying the hidden information, which is convenient for consumers to check the authenticity.

[0056] 2. The invention uses a mathematical algorithm for encryption, has a high degree of anti-counterfeiting, is not easy to be cracked and forged, and increases the difficulty of imitation.

[0057] 3. The present invention adopts a new anti-counterfeiting feature, making the anti-counterfeiting mark exclusive.

[0058] 4. The present invention utilizes a transfer process to realize laser holographic information on a paper substrate. The preparation method of the label is scientific, reasonable, simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of the layer structure of the present invention;

[0060] Figure 2is the hidden pattern in Embodiment 1 of the present invention;

[0061] Figure 3 is the grayscale image corresponding to the matrix G in Embodiment 1 of the present invention;

[0062] Figure 4 is the grayscale image corresponding to the matrix H in Embodiment 1 of the present invention;

[0063] In the figure: 1. Laser encrypted information layer; 2. Copy layer; 3. Composite adhesive layer; 4. Printing layer; 5. Paper layer; 6. Pressure-sensitive adhesive layer; 7. Silicone oil paper layer. DETAILED DESCRIPTION

[0064] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to the following embodiments.

[0065] Unless otherwise specified, the methods are conventional methods. Unless otherwise specified, the raw materials can be obtained from public commercial channels.

[0066] Example 1

[0067] The point light source reading laser encrypted paper anti-counterfeiting mark includes a laser encrypted information layer 1, a copy layer 2, a composite adhesive layer 3, a printing layer 4, a paper layer 5, a pressure-sensitive adhesive layer 6 and a silicone oil paper layer 7 which are arranged in sequence from top to bottom. The laser encrypted information layer 1 contains hidden information, and the hidden information is revealed under the point light source.

[0068] The laser encrypted information layer 1 hides digital coded information.

[0069] The replication layer 2 is UV varnish that can replicate holographic patterns.

[0070] The thickness of the replication layer 2 is 5 μm. The replication layer 2 can be completely peeled off from the laser encrypted information layer 1, and its peeling strength is 0.06 kN / m.

[0071] The 5-gram paper layer has a weight of 65 grams per square meter.

[0072] The method for preparing a point light source for reading a laser-encrypted paper anti-counterfeiting mark comprises the following steps:

[0073] 1) Select a PET base film with a single-sided corona of 35 μm thickness, and coat the corona surface with a permanent imaging layer, which cannot be separated from the PET film;

[0074] 2) Production of laser encrypted information layer 1 mold plate:

[0075] First, a hidden pattern is made, and the hidden pattern is placed in a polar coordinate system. According to a systematic sampling method, N (N=n*n) pixels are randomly selected, where n≥4. The distance ρ and the angle θ from each pixel to the zero point of the coordinate system are calculated respectively. According to the distance from each pixel to the zero point of the coordinate system, an n*n matrix is ​​obtained, and finally the space-frequency grayscale image matrix G is obtained; according to the angle from each pixel to the zero point of the coordinate system, an n*n matrix is ​​obtained, and finally the angle grayscale image matrix H is obtained. According to the space-frequency grayscale image matrix G and the angle grayscale image matrix H, the plate making work of the laser encryption information mold layer is completed in the lithography machine, and the laser encryption information layer 1 mold plate is obtained;

[0076] 3) using a molding machine to copy the laser encrypted information onto the permanent imaging layer to form a laser encrypted information layer 1;

[0077] 4) Apply UV varnish on the laser encrypted information layer 1 to form a replica layer 2;

[0078] 5) Printing pictures, QR codes and anti-counterfeiting features on the paper layer 5 to form a printed layer 4;

[0079] 6) Compounding the PET base film with the processed replica layer 2 with the printed layer 4 using compound glue, the dry coating amount of the compound glue is 9 g / m2, the drying temperature is 100°C, and the vehicle speed is 40 m / min;

[0080] 7) After the composite is firmly bonded, the PET base film and the permanent imaging layer are peeled off;

[0081] 8) Using a glue coating machine to apply glue on the non-printing surface of the paper layer 5 and compound it with the silicone oil paper;

[0082] 9) Use a die-cutting machine to die-cut into individual logos.

[0083] The production of the laser encrypted information layer 1 mold plate specifically includes the following steps:

[0084] (1) According to the design file, a hidden pattern is made, a polar coordinate system is established, and the pattern is placed at the zero point in the polar coordinate system;

[0085] (2) The pattern resolution is a*b, and the pattern consists of a*b pixels. According to the systematic sampling method, N (N=n*n) pixels are randomly selected, where n≥4. The coordinates of each pixel are calculated using a computer (x1, y1), (x2, y2), (x3, y3), ... (x N ,y N ), and the distance between each pixel and the zero point (ρ1, ρ2, ρ3, ... ρ N );

[0086] (3) According to the polar coordinate system formula x = ρcosθ, y = ρcosθ, calculate the angle between each pixel and the zero point (θ1, θ1, θ1, ... θ N );

[0087] (4) L is the observation distance, which is a fixed parameter. β is the grating angle, d is the grating pitch, and λ is the laser wavelength. According to tanβ=ρ / L, β can be obtained. According to the grating equation sinβ=λ / d, the grating pitch d can be obtained. At this time, the two-dimensional parameters (d1, θ1), (d2, θ2), (d3, θ3)...(d N ,θ N );

[0088] (5) According to the grating pitch d of N grating lattices, a matrix can be obtained as follows:

[0089] d1, d2,……………………d n

[0090] d n+1 , d n+2 ,………………d 2*n

[0091] ………………………………

[0092] d n*(n-1)+1 , d n*(n-1)+2 , ...d n*n ;

[0093] Calculate the maximum value of d max and the minimum value d min , the minimum value corresponds to the grayscale value 0, and the maximum value corresponds to the grayscale value 255. According to this correspondence, the N values ​​of d can be mapped to another matrix G composed of grayscale values. This matrix constitutes a grayscale image, as follows:

[0094] G1, G2,……………………G n

[0095] G n+1 , G n+2 ,………………G 2*n

[0096] ………………………………

[0097] G n*(n-1)+1 , G n*(n-1)+2 , ... G n*n ;

[0098] (6) According to the angle θ of N grating lattices, a matrix can be obtained as follows:

[0099] θ1, θ2,……………………θ n

[0100] θ n+1 ,θ n+2 ,………………θ 2*n

[0101] ………………………………

[0102] θ n*(n-1)+1 ,θ n*(n-1)+2 , ...θ n*n ;

[0103] Calculate the maximum value of θ max and the minimum value θ min , the minimum value corresponds to the grayscale value 0, and the maximum value corresponds to the grayscale value 255. According to this correspondence, the N θ values ​​can be mapped to another matrix H composed of grayscale values. This matrix constitutes a grayscale image, as follows:

[0104] H1, H2,……………………H n

[0105] H n+1 , H n+2 ,………………H 2*n

[0106] ………………………………

[0107] H n*(n-1)+1 , H n*(n-1)+2 , ...H n*n ;

[0108] (7) According to the photolithography space-frequency grayscale matrix G and the grating angle grayscale matrix H, an exposure unit is manufactured. The size of the exposure unit is a square with a side length of n / R mm, where R is the resolution of the photolithography pattern, 10 dpi<R<50800 dpi;

[0109] (8) The exposure units in step (7) are arrayed into a designed size, fabricated on a photoresist plate through a photolithography process, and then developed and electroplated to obtain a laser encryption information layer 1 mold plate.

[0110] According to the design documents, make Figure 2 For the hidden pattern "S" shown, a polar coordinate system is established and the pattern "S" is placed at the zero point in the polar coordinate system.

[0111] Select the pattern "S" and extract 16 points (N=4*4) on the pattern. The distances ρ from the zero point of the 16 sampling points of the pattern generated by the computer are: 10, 10, 10, 10, 10, 7.2, 2.8, 2.8, 7.2, 10, 10, 10, 10, 10, 10. The calculated angles θ are: 45°, 60°, 80°, 100°, 120°, 135°, 150°, 150°, 330°, 330°, 315°, 300°, 280°, 260°, 240°, 225°. The maximum value is 330° and the minimum value is 45°. According to the value of ρ and the observation distance L, according to the grating angle formula β=arctanρ / L and the grating equation sinβ=λ / d, λ=650×10 -9 m, we can get the grating pitch d, and correspond the 16 values ​​of d to another matrix G composed of grayscale values. This matrix constitutes a grayscale image, as follows:

[0112] 255, 255, 255, 255

[0113] 255, 255, 156, 0

[0114] 0, 156, 255, 255

[0115] 255, 255, 255, 255.

[0116] The gray value matrix G corresponds to the gray image Figure 3 shown.

[0117] The 16 θ values ​​are mapped into another matrix H composed of angle grayscale values. This matrix forms a grayscale image as follows:

[0118] 0, 13, 31, 49

[0119] 67, 80, 94, 94

[0120] 255, 255, 241, 228

[0121] 210, 192, 175, 161.

[0122] The gray value matrix H corresponds to the gray image Figure 4 shown.

[0123] According to the lithography space-frequency grayscale matrix G and the grating angle grayscale matrix H, an exposure unit is made, and then the exposure units are arrayed into a designed size and made on a photoresist plate through a photolithography process. After development and electroplating, a laser encrypted information layer molded plate containing the hidden pattern "S" information is obtained.

[0124] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and equal changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention should all fall within the scope of the patent coverage of the present invention.

Claims

1. A point light source for reading laser-encrypted paper anti-counterfeiting labels, characterized by: The invention comprises a laser encrypted information layer (1), a copy layer (2), a composite adhesive layer (3), a printing layer (4), a paper layer (5), a pressure-sensitive adhesive layer (6) and a silicone oil paper layer (7) which are arranged in sequence from top to bottom, wherein the laser encrypted information layer (1) contains hidden information, and the hidden information is visible under a point light source; The method for preparing a point light source for reading a laser-encrypted paper anti-counterfeiting mark comprises the following steps: 1) Select a PET base film with a single-sided corona and apply a permanent imaging layer on the corona surface; 2) Laser encryption information layer (1) Production of molded plate: First, a hidden pattern is produced, and the hidden pattern is placed in a polar coordinate system. According to a systematic sampling method, N (N=n*n) pixels are randomly selected, where n≥4. The distance ρ and the angle θ from each pixel to the zero point of the coordinate system are calculated respectively. According to the distance from each pixel to the zero point of the coordinate system, an n*n matrix is ​​obtained, and finally a space-frequency grayscale image matrix G is obtained; according to the angle from each pixel to the zero point of the coordinate system, an n*n matrix is ​​obtained, and finally an angle grayscale image matrix H is obtained. According to the space-frequency grayscale image matrix G and the angle grayscale image matrix H, the plate making work of the laser encryption information mold layer is completed in a photolithography machine, and a laser encryption information layer (1) mold plate is obtained; 3) using a molding machine to copy the laser encrypted information onto the permanent imaging layer to form a laser encrypted information layer (1); 4) coating UV varnish on the laser encrypted information layer (1) to form a replica layer (2); 5) Printing images, QR codes and anti-counterfeiting features on the paper layer (5) to form a printed layer (4); 6) Compounding the PET base film with the processed replica layer (2) with the printed layer (4) using compound glue; 7) After the composite is firmly bonded, the PET base film and the permanent imaging layer are peeled off; 8) using a glue coating machine to apply glue on the non-printing surface of the paper layer (5) and laminate it with the silicone oil paper; 9) Use a die-cutting machine to die-cut into individual logos; The production of the laser encrypted information layer (1) mold plate comprises the following steps: (1) According to the design file, a hidden pattern is made, a polar coordinate system is established, and the pattern is placed at the zero point in the polar coordinate system; (2) The pattern resolution is a*b, and the pattern consists of a*b pixels. According to the systematic sampling method, N (N=n*n) pixels are randomly selected, where n≥4. The coordinates of each pixel are calculated using a computer (x1, y1), (x2, y2), (x3, y3), ... (x N ,y N ), and the distance between each pixel and the zero point (ρ1, ρ2, ρ3, ... ρ N ); (3) According to the polar coordinate system formula x = ρcosθ, y = ρcosθ, calculate the angle between each pixel and the zero point (θ1, θ1, θ1, ... θ N ); (4) L is the observation distance, which is a fixed parameter. β is the grating angle, d is the grating pitch, and λ is the laser wavelength. According to tanβ=ρ / L, β can be obtained. According to the grating equation sinβ=λ / d, the grating pitch d can be obtained. At this time, the two-dimensional parameters (d1, θ1), (d2, θ2), (d3, θ3)...(d N ,θ N ); (5) According to the grating pitch d of N grating lattices, a matrix can be obtained as follows: d1,d2,……………………d n d n+1 ,d n+2 ,………………d 2*n ……………………………… d n*(n-1)+1 ,d n*(n-1)+2 ,……d n*n Calculate the maximum value of d max and the minimum value d min , the minimum value corresponds to the grayscale value 0, and the maximum value corresponds to the grayscale value 255. According to this correspondence, the N values ​​of d can be mapped to another matrix G composed of grayscale values. This matrix constitutes a grayscale image, as follows: G1,G2,……………………G n G n+1 ,G n+2 ,………………G 2*n ……………………………… G n*(n-1)+1 ,G n*(n-1)+2 ,……G n*n ; (6) According to the angle θ of N grating lattices, a matrix can be obtained as follows: θ1, θ2,………………………θ n i n+1 ,the n+2 ,………………i 2*n ……………………………… i n*(n-1)+1 ,the n*(n-1)+2 ,……θ n*n Calculate the maximum value of θ max and the minimum value θ min , the minimum value corresponds to the grayscale value 0, and the maximum value corresponds to the grayscale value 255. According to this correspondence, the N θ values ​​can be mapped to another matrix H composed of grayscale values. This matrix constitutes a grayscale image, as follows: H1,H2,……………………H n H n+1 ,H n+2 ,………………H 2*n ……………………………… H n*(n-1)+1 ,H n*(n-1)+2 ,……H n*n ; (7) According to the photolithography space-frequency grayscale matrix G and the grating angle grayscale matrix H, an exposure unit is manufactured. The size of the exposure unit is a square with a side length of n / R mm, where R is the resolution of the photolithography pattern, 10 dpi<R<50800 dpi; (8) Arraying the exposure units in step (7) into a designed size, fabricating them on a photoresist plate through a photolithography process, and obtaining a laser encryption information layer mold plate after development and electroplating.

2. The point light source for reading laser encrypted paper anti-counterfeiting labels according to claim 1, characterized in that: The laser encrypted information layer (1) hides digital coded information.

3. The point light source for reading laser encrypted paper anti-counterfeiting labels according to claim 1, characterized in that: The laser encrypted information layer (1) is formed by copy transfer.

4. The point light source for reading laser encrypted paper anti-counterfeiting labels according to claim 1, characterized in that: The hidden information of the laser encrypted information layer (1) includes words, letters, numbers, symbols or graphics.

5. The point light source for reading laser encrypted paper anti-counterfeiting labels according to claim 1, characterized in that: The hidden information of the laser encrypted information layer (1) is composed of a plurality of square grating lattice arrays, which are processed by laser etching. The grating lattice contains two parameters: grating space frequency and grating angle.

6. The point light source for reading laser encrypted paper anti-counterfeiting labels according to claim 1, characterized in that: The replication layer (2) is UV varnish that can replicate holographic patterns.

7. The point light source for reading laser encrypted paper anti-counterfeiting labels according to claim 1, characterized in that: The thickness of the replication layer (2) is 4-6 μm; the replication layer (2) can be completely peeled off from the laser encrypted information layer (1), and its peeling strength is 0.04-0.09 kN / m.

8. The point light source for reading laser encrypted paper anti-counterfeiting labels according to claim 1, characterized in that: The paper layer (5) has a gram weight of 50-80 g / m2.

Images