Point light source reading laser encryption anti-counterfeiting tag 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 anti-counterfeiting hangtag and a preparation method thereof. The anti-counterfeiting hangtag comprises a laser encrypted information layer, a copy layer, a composite adhesive layer, a printing layer and a 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 anti-counterfeiting hangtag 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 hangtag 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, 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 invention relates to the field of anti-counterfeiting technology products, and in particular to a point light source reading laser encryption anti-counterfeiting hangtag and a preparation method thereof. Background Art

[0002] In today's society, companies are paying more and more attention to brand protection. Designing your own anti-counterfeiting hangtag plays a positive role in improving and protecting the company's reputation and promoting products. Hangtags in the existing technology often do not have anti-counterfeiting functions. Even hangtags with anti-counterfeiting functions are often easy to be counterfeited due to their single anti-counterfeiting means, which seriously damages the interests of operators.

[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. Today, hangtags have long been cracked by counterfeiters from all aspects and have almost completely lost their anti-counterfeiting capabilities, prompting people to begin seeking to improve existing technologies. As a result, optical image coding encryption technologies such as laser reading, optical micro-shrinking, 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] Chinese patent CN203134260U discloses an anti-counterfeiting logistics integrated holographic positioning hangtag, which includes a cardboard layer, an aluminum-plated layer and a pattern layer from bottom to top on the upper part of the cardboard layer, wherein the pattern layer is printed with a logistics barcode and an anti-counterfeiting code, and the aluminum-plated layer is composited with the cardboard layer. Since the aluminum-plated layer itself has an anti-counterfeiting function, combined with the surface anti-counterfeiting code, the anti-counterfeiting function of the hangtag is further improved. However, the hangtag 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 anti-counterfeiting tag, which contains a laser encrypted information layer. The encrypted information is hidden under natural light, and the hidden information is presented under the illumination of a point light source device, so that consumers can check the authenticity. The anti-counterfeiting ability is high and it is not easy to be cracked or 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 readable laser encrypted anti-counterfeiting tag comprises a laser encrypted information layer, a copy layer, a composite adhesive layer, a printing layer and a paper layer 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 from 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 is one of coated paper, offset paper or anti-counterfeiting paper, and has a gram weight of 120-300 g / m2.

[0016] The method for preparing a point light source readable laser encrypted anti-counterfeiting hang tag 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 base 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 compound glue; the dry coating amount of the compound 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 cutting machine to cut into individual hang tags.

[0026] Preferably, the production of the laser encrypted information layer embossing plate specifically includes the following steps:

[0027] (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;

[0028] (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 );

[0029] (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 );

[0030] (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 );

[0031] (5) According to the grating pitch d of N grating lattices, a matrix can be obtained as follows:

[0032] d1, d2,……………………d n

[0033] d n+1 , d n+2 ,………………d 2*n

[0034] ………………………………

[0035] d n*(n-1)+1 , d n*(n-1)+2 , ...d n*n

[0036] 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:

[0037] G1, G2,……………………G n

[0038] G n+1 , G n+2 ,………………G 2*n

[0039] ………………………………

[0040] G n*(n-1)+1 , G n*(n-1)+2 , ... G n*n ;

[0041] (6) According to the angle θ of N grating lattices, a matrix can be obtained as follows:

[0042] θ1, θ2,……………………θ n

[0043] θ n+1 ,θn+2 ,………………θ 2*n

[0044] ………………………………

[0045] θ n*(n-1)+1 ,θ n*(n-1)+2 , ...θ n*n

[0046] 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:

[0047] H1, H2,……………………H n

[0048] H n+1 , H n+2 ,………………H 2*n

[0049] ………………………………

[0050] H n*(n-1)+1 , H n*(n-1)+2 , ...H n*n ;

[0051] (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;

[0052] (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.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] 1. The point light source readable laser encrypted anti-counterfeit tag of the present invention is provided with a laser encrypted information layer, in which a digital coded 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 tag 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.

[0055] 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.

[0056] 3. The present invention adopts a new anti-counterfeiting feature, making the anti-counterfeiting hangtag exclusive.

[0057] 4. The present invention utilizes a transfer process to realize laser holographic information on a paper substrate. The preparation method of the hangtag is scientific, reasonable, simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a schematic diagram of the layer structure of the present invention;

[0059] Figure 2 is the hidden pattern in Embodiment 1 of the present invention;

[0060] Figure 3 is the grayscale image corresponding to the matrix G in Embodiment 1 of the present invention;

[0061] Figure 4 is the grayscale image corresponding to the matrix H in Embodiment 1 of the present invention;

[0062] In the figure: 1. Laser encrypted information layer; 2. Copy layer; 3. Composite adhesive layer; 4. Printing layer; 5. Paper layer. DETAILED DESCRIPTION

[0063] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to the following embodiments.

[0064] Unless otherwise specified, the methods are conventional methods. Unless otherwise specified, the raw materials can be obtained from public commercial channels.

[0065] Example 1

[0066] The point light source readable laser encrypted anti-counterfeiting tag comprises a laser encrypted information layer 1, a copy layer 2, a composite adhesive layer 3, a printing layer 4 and a paper layer 5 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.

[0067] The laser encrypted information layer 1 hides digital coded information.

[0068] The replication layer 2 is UV varnish that can replicate holographic patterns.

[0069] 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.

[0070] The paper layer 5 is coated paper with a gram weight of 210 g / m2.

[0071] The method for preparing the point light source reading laser encrypted anti-counterfeiting tag comprises the following steps:

[0072] 1) Select a PET base film with a single-sided corona of 31 μm thickness, and coat the corona surface with a permanent imaging layer, which cannot be separated from the PET base film;

[0073] 2) Production of laser encrypted information layer 1 mold plate:

[0074] 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;

[0075] 3) using a molding machine to copy the laser encrypted information onto the permanent imaging layer to form a laser encrypted information layer 1;

[0076] 4) Apply UV varnish on the laser encrypted information layer 1 to form a replica layer 2;

[0077] 5) Printing pictures, texts, QR codes and anti-counterfeiting features on the paper layer 5 to form a printed layer 4;

[0078] 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 10 g / m2, the drying temperature is 100°C, and the vehicle speed is 40 m / min;

[0079] 7) After the composite is firmly bonded, the PET base film and the permanent imaging layer are peeled off;

[0080] 8) Use a cutting machine to cut into individual hang tags.

[0081] The production of the laser encrypted information layer 1 mold plate specifically includes the following steps:

[0082] (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;

[0083] (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 );

[0084] (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 );

[0085] (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 );

[0086] (5) According to the grating pitch d of N grating lattices, a matrix can be obtained as follows:

[0087] d1, d2,……………………d n

[0088] d n+1 , d n+2 ,………………d 2*n

[0089] ………………………………

[0090] d n*(n-1)+1 , d n*(n-1)+2 , ...d n*n

[0091] 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:

[0092] G1, G2,……………………G n

[0093] G n+1 , G n+2 ,………………G 2*n

[0094] ………………………………

[0095] G n*(n-1)+1 , G n*(n-1)+2 , ... G n*n ;

[0096] (6) According to the angle θ of N grating lattices, a matrix can be obtained as follows:

[0097] θ1, θ2,……………………θ n

[0098] θ n+1 ,θ n+2 ,………………θ 2*n

[0099] ………………………………

[0100] θ n*(n-1)+1 ,θ n*(n-1)+2 , ...θ n*n

[0101] 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:

[0102] H1, H2,……………………H n

[0103] H n+1 , H n+2 ,………………H 2*n

[0104] ………………………………

[0105] H n*(n-1)+1 , H n*(n-1)+2 , ...H n*n ;

[0106] (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;

[0107] (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.

[0108] According to the design documents, make Figure 2 The hidden pattern "double ring" shown is used to establish a polar coordinate system and place the pattern "double ring" at the zero point in the polar coordinate system.

[0109] Select the pattern "double ring" 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: 7, 14, 7, 14, 7, 14, 7, 14, 7, 14, 7, 14, 7, 14, 7, 14. The calculated angles θ are: 0°, 0°, 45°, 45°, 90°, 90°, 135°, 135°, 180°, 180°, 225°, 225°, 270°, 270°, 315°, 315°. The maximum value is 315° and the minimum value is 0°. 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:

[0110] 0, 255, 0, 255

[0111] 0, 255, 0, 255

[0112] 0, 255, 0, 255

[0113] 0, 255, 0, 255.

[0114] The gray value matrix G corresponds to the gray image Figure 3 shown.

[0115] The 16 θ values ​​are mapped into another matrix H composed of angle grayscale values. This matrix forms a grayscale image as follows:

[0116] 0,0,36,36

[0117] 73, 73, 109, 109

[0118] 146, 146, 182, 182

[0119] 219, 219, 255, 255.

[0120] The gray value matrix H corresponds to the gray image Figure 4 shown.

[0121] 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 the designed size and made on the photoresist plate through the photolithography process. After development and electroplating, a laser encrypted information layer molded plate containing the hidden pattern "double ring" information is obtained.

[0122] 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 anti-counterfeiting tags, characterized by: It comprises a laser encrypted information layer (1), a copy layer (2), a composite adhesive layer (3), a printing layer (4) and a paper layer (5) 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 the point light source reading laser encrypted anti-counterfeiting tag 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) Use a cutting machine to cut into individual hang tags; 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 reading laser encryption anti-counterfeiting tag according to claim 1 is characterized by: The laser encrypted information layer (1) hides digital coded information.

3. The point light source reading laser encryption anti-counterfeiting tag according to claim 1 is characterized by: The laser encrypted information layer (1) is formed by copy transfer.

4. The point light source reading laser encryption anti-counterfeiting tag 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 reading laser encryption anti-counterfeiting tag according to claim 1 is characterized by: 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 reading laser encryption anti-counterfeiting tag according to claim 1, characterized in that: The replication layer (2) is UV varnish that can replicate holographic patterns.

7. The point light source reading laser encryption anti-counterfeiting tag 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 reading laser encryption anti-counterfeiting tag according to claim 1, characterized in that: The paper layer (5) is one of coated paper, offset paper or anti-counterfeiting paper, and has a gram weight of 120-300 g / m2.

Images