WO2023005997A1

WO2023005997A1 - Anti-counterfeiting element, product, and method for manufacturing anti-counterfeiting element

Info

Publication number: WO2023005997A1
Application number: PCT/CN2022/108368
Authority: WO
Inventors: 孙凯; 杨栋
Original assignee: 中钞特种防伪科技有限公司; 中国印钞造币集团有限公司
Priority date: 2021-07-28
Filing date: 2022-07-27
Publication date: 2023-02-02
Also published as: CN115674932A

Abstract

Disclosed are an anti-counterfeiting element, a product, and a method for manufacturing an anti-counterfeiting element. The anti-counterfeiting element comprises: a translucent substrate (100); and an image layer (200), which is located on a surface of the substrate or located in the substrate, wherein the image layer includes a transparent region (201) and opaque regions (202) for visible light; the reflection property of the opaque regions is the same as or similar to the reflection property of the substrate; and the image layer is invisible during reflection observation, and is visible during transmission observation. Since the image layer comprises a transparent region with higher light transmittance and opaque regions with lower light transmittance, the anti-counterfeiting element may present a high-contrast image during transmission observation. Since the reflection property of the opaque regions is the same as or similar to the reflection property of the substrate, the image layer can be hidden well during reflection observation. The anti-counterfeiting element has a better degree of identification and better reliability.

Description

Security element, product and method for producing a security element

Cross References to Related Applications

This application claims the priority of the Chinese patent application with the application number 202110859283.5 and the application title "Anti-counterfeit element, product and method for manufacturing anti-counterfeit element" submitted to the Chinese Patent Office on July 28, 2021, the entire content of which is passed References are incorporated in this application.

technical field

The present application relates to the field of anti-counterfeiting technology, in particular to an anti-counterfeiting element, a product and a method for manufacturing the anti-counterfeiting element.

Background technique

Anti-counterfeiting technology refers to the measures taken to facilitate users to distinguish the authenticity for the purpose of anti-counterfeiting. Anti-counterfeiting technology can accurately identify the authenticity within a certain range, and is not easy to be imitated and copied. Simply put, it is a technology to prevent counterfeiting and counterfeiting. . In order to prevent counterfeiting by means of scanning and copying, banknotes, financial instruments and other data carriers (such as valuable documents or certification documents) and other valuables (such as brand-name items) are usually equipped with security elements or anti-counterfeiting elements to verify the data carrier. authenticity while protecting it from unauthorized copying. At present, the identification and reliability of anti-counterfeiting components on banknotes or certificates are relatively poor.

application content

In order to overcome the shortcomings of the prior art, the embodiments of the present application provide an anti-counterfeit element, a product and a method for manufacturing the anti-counterfeit element.

In order to achieve the above purpose, the first aspect of the present application provides an anti-counterfeiting element, including:

translucent substrate;

An image layer, located on the surface of a translucent substrate or within the substrate, the image layer comprising transparent regions for visible light and opaque regions, the reflective properties of the opaque regions being the same or similar to those of the translucent substrate, the image layer when viewed in reflection are invisible and visible when viewed in transmission.

In the embodiment of the present application, the light transmittance of the translucent substrate ranges from 25% to 75%.

In the embodiment of the present application, the light transmittance of the transparent area is higher than 75%.

In the embodiment of the present application, the light transmittance of the opaque region is lower than 10%.

In the embodiment of the present application, the translucent substrate includes plastic.

In the embodiment of the present application, the translucent substrate includes paper.

In the embodiment of the present application, the paper contains cotton fibers.

In the embodiment of the present application, the light transmittance of the paper ranges from 30% to 60%.

In the embodiment of the present application, the thickness of the paper ranges from 75 microns to 150 microns.

In the embodiment of the present application, the paper has watermarks formed due to different paper thicknesses.

In the embodiment of this application, the image layer includes:

structural layer; and

A reflective layer located on the surface of the structural layer, the reflective layer covering a part of the structural layer to form the opaque region.

In the embodiment of the present application, the surface of the structural layer located in the opaque region is provided with a relief microstructure, and the reflective layer is conformally formed on the relief microstructure.

In the embodiment of the present application, the relief microstructure includes a diffraction grating structure.

In the embodiment of the present application, the relief microstructure includes surfaces with different inclination angles, so that the reflective layer forms reflective mirror surfaces with different inclination angles.

In an embodiment of the present application, the reflective layer includes a color layer, so that the opaque region is consistent with the color of the substrate when viewed in reflection.

In the embodiment of the present application, the reflective layer includes metal aluminum coating.

In an embodiment of the present application, the structural layer comprises thermoplastic polyester PET plastic.

In the embodiment of the present application, the image layer is presented as a one-dimensional code or a two-dimensional code.

In the embodiment of the present application, the translucent substrate includes an optically variable anti-counterfeiting element, and the optically variable anti-counterfeiting element includes at least one of color changing features, dynamic features, three-dimensional features, and identifiable features under point light sources.

In the embodiment of the present application, the translucent substrate includes a gravure pattern formed due to different ink accumulation thicknesses.

In the embodiment of the present application, the anti-counterfeit element further includes: a transparent adhesive layer combining the translucent substrate and the image layer.

In the embodiment of the present application, the translucent substrate includes a laminated transparent structural layer and a translucent coating.

In the embodiment of the present application, the fabrication of the image layer includes a digital printing process or a printing process.

In the embodiment of the present application, the fabrication of the image layer includes a laser ablation process.

The second aspect of the present application provides an anti-counterfeit product, which includes the above-mentioned anti-counterfeit element.

In this embodiment of the application, the anti-counterfeit product includes banknotes or certificates.

In the embodiment of the present application, the certificate includes at least one of a bank card, a cash card, an authorization card, an ID card and a passport.

The third aspect of the present application provides a method for manufacturing an anti-counterfeiting element, comprising:

providing a first substrate;

Provide a microstructured embossing plate with an embossed microstructure;

embossing a relief microstructure on the surface of the first substrate using a microstructure embossing plate, whereby the surface of the first substrate includes a first region with the relief microstructure and a second region without the relief microstructure;

forming a reflective layer on the surface of the first substrate;

removing the reflective layer on the second area;

forming a structured layer on the reflective layer;

A second substrate is provided, and the second substrate is bonded to the structural layer.

In this technical solution, since the image layer includes transparent areas with higher light transmittance and opaque areas with lower light transmittance, and the image layer is visible when viewed through transmission, the anti-counterfeiting element can show high Contrast images; in addition, since the reflective properties of the opaque area are the same or similar to those of the substrate, the image layer can be well hidden when viewed in reflection; this makes the identification and reliability of the anti-counterfeiting element better.

Description of drawings

The accompanying drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the description, and are used together with the following specific implementation methods to explain the embodiments of the present application, but do not constitute limitations to the embodiments of the present application. In the attached picture:

FIG. 1 schematically shows a schematic structural view of an anti-counterfeiting element according to an embodiment of the present application;

Fig. 2 schematically shows a schematic structural view of another anti-counterfeiting element according to an embodiment of the present application;

Fig. 3 schematically shows a schematic structural view of another anti-counterfeiting element according to an embodiment of the present application;

Fig. 4 schematically shows a flow chart of a method for manufacturing an anti-counterfeit element according to an embodiment of the present application;

Fig. 5 schematically shows a flow chart of another method for manufacturing an anti-counterfeiting element according to an embodiment of the present application.

Detailed ways

The specific implementation manners of the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present application, and are not intended to limit the embodiments of the present application.

It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the implementation of the present application, the directional indications are only used to explain the position in a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indications or hints Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist. , nor within the scope of protection required by the present application.

Fig. 1 schematically shows a schematic structural diagram of an anti-counterfeiting element according to an embodiment of the present application. As shown in Figure 1, in an embodiment of the present application, an anti-counterfeiting element is provided, including:

translucent substrate 100;

An image layer 200, located on the surface of the translucent substrate 100 or within the translucent substrate 100, the image layer 200 includes a transparent region 201 for visible light and an opaque region 202, the reflective properties of the opaque region 202 are the same as those of the substrate 100 Or similarly, the image layer 200 is invisible when viewed in reflection and visible when viewed in transmission.

In the visible light band, the reflection property of the opaque region 202 is the same or similar to that of the substrate 100 . The image layer 200 is invisible when viewed in reflection and is visible when viewed in transmission. For example, when the image layer 200 is placed on a common desktop, the image layer 200 is viewed in reflection. In this case, the image layer 200 is viewed in reflection. 200 is invisible, the image layer 200 can be well hidden in the translucent substrate 100 when viewed in reflection. When the image layer 200 is lifted and the image layer 200 is placed between the eyes and the light source, the light source passes through the image layer 200, and the image layer 200 is observed through transmission, in which case the image layer 200 is visible. The image layer 200 also cannot be copied by digital means such as photography or scanning, which improves the identification and reliability of the anti-counterfeiting element.

In this technical solution, since the image layer 200 includes a transparent region 201 with a higher light transmittance and an opaque region 202 with a lower light transmittance, and the image layer 200 is visible when viewed through transmission, the anti-counterfeiting element will A high-contrast image can be presented; in addition, since the reflective properties of the opaque region 202 are the same or similar to those of the substrate 100, the image layer 200 is invisible when viewed in reflection and can be well hidden by the translucent In the substrate 100; this makes the identification and reliability of the anti-counterfeiting element better.

In one embodiment, the light transmittance of the translucent substrate 100 ranges from 25% to 75%.

In one embodiment, the light transmittance of the transparent area 201 is higher than 75%, and the light transmittance of the opaque area 202 is lower than 10%.

In one embodiment, the translucent substrate 100 includes cotton fiber paper, the light transmittance of the cotton fiber paper ranges from 30% to 60%, and the thickness of the cotton fiber paper ranges from 75 microns to 150 microns.

In one embodiment, the cotton fiber paper has watermarks formed by different thicknesses of the paper.

In the embodiment of the present application, the image layer 200 includes:

structural layer; and

A reflective layer on the surface of the structural layer, the reflective layer covers a part of the structural layer to form an opaque region 202 .

The structural layer of the image layer 200 can be a layer of transparent PET (polyethylene terephthalate) plastic or a layer of transparent polymer coating. The reflective layer is located on the surface of the structural layer, the reflective layer covers a part of the structural layer to form an opaque region 202 , and the uncovered transparent structural layer forms a transparent region 201 .

In one embodiment, the surface of the structural layer located in the opaque region 202 is provided with a relief microstructure, and the reflective layer is conformally formed on the relief microstructure.

The isomorphic formation of the reflection layer on the relief microstructure can be understood as that the structure of the reflection layer and the relief microstructure are the same or similar, and the reflection layer is formed on the surface of the relief microstructure.

In one embodiment, the relief microstructure includes a diffraction grating structure.

In one embodiment, the relief microstructure includes surfaces with different inclination angles, so that the reflective layer forms reflective mirror surfaces with different inclination angles.

In one embodiment, the reflective layer includes a color layer such that the opaque region 202 matches the color of the translucent substrate 100 when viewed in reflection.

In one embodiment, the reflective layer includes metallic aluminum coating.

In one embodiment, the structural layer comprises thermoplastic polyester PET plastic.

In one embodiment, the image layer 200 is presented as a one-dimensional code or a two-dimensional code.

The image layer 200 is presented as an information code, which may be a one-dimensional code or a two-dimensional code. The code system of the one-dimensional code can be EAN code (European Article Number), 39 code, Interleaved Two of Five code (Interleaved Two of Five), UPC code (Universal Product Code), 128 code (EAN-128 code) , code 93, ISBN code or Codabar, etc. The code system of the QR code can be PDF417 (Portable Data File), QR Code (Quick Response Code, Quick Response Code), Code49, Code16K, Code One, Data Matrix or Maxi Code, etc. Preferably, the image layer 200 is presented as a QR Code. QR Code in two-dimensional code can be widely used. These codes can be identified using mobile terminals such as handheld code reading equipment, industrial assembly line code reading equipment, or smart phones, and the identified code data can be transmitted to the database for entry and comparison.

In one embodiment, the translucent substrate 100 includes optically variable anti-counterfeiting elements and gravure patterns formed due to different ink accumulation thicknesses, and the optically variable anti-counterfeiting elements include color changing features, dynamic features, three-dimensional features and point light At least one of the features can be identified.

In one embodiment, the anti-counterfeiting element further includes a transparent adhesive layer combining the translucent substrate 100 and the image layer 200 .

In one embodiment, the translucent substrate 100 includes a laminated transparent structural layer and a translucent coating.

The translucent substrate 100 can be paper, for example, the translucent substrate 100 is white cotton fiber paper. The opaque area 202 may be a diffuse reflection structure with a metal aluminum coating on the surface. By selecting the period and depth of the diffuse reflection structure, the opaque region 202 can produce a white diffuse reflection effect similar to paper. The image layer 200 is embedded in the middle of the white paper, and since the opaque area 202 has reflection properties similar to that of the paper, the image layer 202 is well hidden and invisible in reflection observation. The translucent substrate 100 can also be plastic.

When the translucent substrate 100 is paper, the image layer 200 can be attached to the surface of the paper by pasting. The image layer 200 can also be hot stamped on the surface of the paper by hot stamping, and then the PET plastic of the image layer 200 can be peeled off and removed. It is also possible to embed the image layer 200 in the middle of the paper during the papermaking process. When the translucent substrate 100 is paper, the paper may also have watermark areas formed by different thicknesses of paper fibers. The paper can also be provided with debossed patterns or optically variable security elements. The intaglio pattern may be located on the surface of the transparent area 201 and/or the opaque area 202 of the image layer 200 . The optically variable security element may be located on the surface of the transparent area 201 and/or the opaque area 202 of the image layer 200 .

The fabrication of the image layer 200 may include the following methods: Firstly, a transparent plastic with a thickness of 10 microns to 14 microns is provided, preferably, the thickness of the transparent plastic is 12 microns. The diffuse reflection microstructure is formed on the transparent plastic by means of UV embossing, and then a metal aluminum layer is evaporated on the surface of the diffuse reflection microstructure. The thickness of the aluminum layer is in the range of 1.5OD-2.5OD. The aluminum layer in a part of the area (ie, the transparent area 201) is removed in a manner. Removing aluminum can also adopt the mode of caustic corrosion, printing protective adhesive layer on the surface of aluminum layer, when passing through caustic, the aluminum layer of the area that is protected (being opaque region 202) is retained, and the region without protective layer (being transparent Region 201) is removed. The printing of the protective adhesive layer can adopt the printing process of fixed plate, and also can adopt the digital printing process. In the process of removing the aluminum layer, a structure with a high aspect ratio can also be fabricated in the transparent region 201 in advance, and the thickness of the aluminum layer formed on this structure is thinner than other regions, and is preferentially removed by corrosion in the alkaline solution.

The anti-counterfeiting element provided by the present application will be described in detail below with the first specific embodiment.

Please refer to FIG. 1 , the image layer 200 is disposed inside the opaque substrate 100 , and the opaque substrate 100 is cotton paper. The thickness of the opaque substrate 100 is in the range of 45-55 microns, preferably 50 microns. The light transmittance of the opaque substrate 100 in the visible light band is 60%-70%, preferably 65%. The image layer 200 includes a transparent structural layer and a reflective layer on the surface of the structural layer. The reflective layer covers a part of the structural layer to form an opaque area 202 , and the uncovered transparent structural layer forms a transparent area 201 . As shown in Figure 1, the opaque area 202 is located in area A of the anti-counterfeiting element, and the transparent area 201 is located in area B of the anti-counterfeiting element. Optionally, the structural layer is PET plastic with a thickness of 10 microns to 20 microns. The light transmittance of the structural layer ranges from 85% to 95%, preferably 90%.

The image layer 200 also includes a microstructure, the reflective layer is located on the surface of the microstructure, and both the reflective layer and the microstructure are located in area A of the anti-counterfeit element. The microstructure can scatter the incident light to multiple angles, you can refer to the cosine distribution law of the Lambert (Lambert) reflected light intensity of the rough reflector, that is, the reflected light intensity is proportional to the cosine of the included angle, where the included angle refers to the reflection The angle between light and incident light. The microstructure can adopt a plurality of tiny reflective mirrors with different inclination angles, and the angular distribution of the reflective mirrors can be obtained according to the above-mentioned cosine distribution law of Lambert's reflected light intensity. The microstructure can also adopt a diffraction grating structure, the period of the grating determines the angle of the diffracted light, and the period distribution can be obtained according to the above-mentioned cosine distribution law of Lambert's reflected light intensity.

A reflective layer is evaporated on the surface of the microstructure to generate enough reflected light, and the reflective layer includes a metal aluminum (Al) layer. The thickness of the aluminum layer ranges from 1.8OD to 2.2OD, preferably 2.0OD. The light transmittance of the metal aluminum layer ranges from 0.5% to 3%, preferably 1%. The reflected light produced by the microstructure is basically consistent with the visual effect of cotton paper. Therefore, in the area A of the anti-counterfeiting element, the image layer 200 does not affect the reflective properties of the paper. The image layer 200 is invisible when viewed in reflection and can be well hidden in the opaque substrate 100. In area B when viewed in reflection, the image layer 200 appears is the color of the opaque substrate 100 . The reflective layer is present in the A region of the security element, but not in the B region of the security element. The aluminum in area B can be removed by means of laser ablation, etc., and a transparent adhesive layer is applied to fill up the microstructure in area B.

When the anti-counterfeit element is observed through transmission, the A area is opaque and appears black, and the B area has the light transmittance of the opaque substrate 100, and the contrast between the A area and the B area of the anti-counterfeit element appears as a pattern. The opaque base material 100 of cotton paper usually appears white. In practical applications, there is a certain deviation between the color of the paper and the white color. According to this deviation, a color coating can be added to the reflective layer, so that the opaque area 202 can be viewed in reflection. Consistent with the color of the opaque substrate 100 . Since the transparent area 201 is transparent, when the anti-counterfeiting element is observed in reflection, the B area appears as the color of the opaque substrate 100.

The anti-counterfeiting element provided by the present application will be described in detail below with a second specific embodiment.

Fig. 2 schematically shows a schematic structural diagram of another anti-counterfeiting element according to an embodiment of the present application, please refer to Fig. 2 , the image layer 200 is located on the surface of the opaque substrate 100, and a The transparent adhesive layer 300 , the thickness of the transparent adhesive layer 300 ranges from 1 micron to 5 microns, is used to combine the opaque substrate 100 and the image layer 200 .

In FIG. 2, the opaque substrate 100 is cotton paper. The thickness of the opaque substrate 100 ranges from 90 microns to 100 microns, preferably 90 microns. The structural layer in the image layer 200 is a transparent polymer coating with a thickness of 3 microns to 7 microns. The light transmittance of the transparent polymer coating ranges from 85% to 95%, preferably 90%. Both the reflective layer and the microstructure are located at position 203 in FIG. 2 , and the reflective layer and microstructure in the image layer 200 are both located in area A of the anti-counterfeiting element.

The anti-counterfeiting element provided by the present application will be described in detail below with a third specific embodiment.

Fig. 3 schematically shows a schematic structural diagram of another anti-counterfeiting element according to an embodiment of the present application, please refer to Fig. 3, the opaque substrate 100 includes a laminated transparent structural layer 101 and a translucent coating 102, the transparent structural layer 101 can be It is a transparent BOPP (biaxially oriented polypropylene film) plastic. The thickness of the transparent structural layer 101 ranges from 90 microns to 110 microns, preferably 100 microns. The translucent coating 102 may be a white coating. The light transmittance of the translucent coating 102 in the visible light band ranges from 45% to 55%, preferably 50%. The image layer 200 is located on the surface of the opaque substrate 100, and a transparent adhesive layer 300 is arranged between the opaque substrate 100 and the image layer 200. The thickness of the transparent adhesive layer 300 is in the range of 1 micron to 5 microns, and is used to combine the opaque substrate 100 and the image layer 200. The image layer 200 is combined. The structural layer in the image layer 200 is a transparent polymer coating with a thickness of 3 microns to 7 microns. The light transmittance of the transparent polymer coating ranges from 85% to 95%, preferably 90%.

When the anti-counterfeiting element is observed through transmission, the A area is opaque and appears black, and the B area has the light transmittance of the translucent coating 102 (ie, the white coating). The contrast between the A area and the B area of the anti-counterfeiting element is shown as pattern. Translucent coating 102 (i.e. white coating) usually appears white, in practical application, there is certain deviation between the color of translucent coating 102 and white, according to this deviation, can increase color coating in reflective layer, so that Opaque region 202 matches the color of substrate 100 when viewed in reflection. Since the transparent area 201 , the transparent structural layer 101 and the transparent adhesive layer 300 are transparent, when the anti-counterfeiting element is observed by reflection, the B area appears as the color of the translucent coating 102 (ie, the white coating).

An embodiment of the present application provides an anti-counterfeit product, including the above-mentioned anti-counterfeit element.

In one embodiment, the anti-counterfeit product includes banknotes or certificates.

In one embodiment, the certificate includes at least one of a bank card, a cash card, an authorization card, an ID card and a passport.

The banknotes may be paper banknotes or polymer banknotes. The bank card may include a credit card. Security elements can also be used for other high value-added items.

When the anti-counterfeiting element is used in banknotes, the printed banknotes have a variety of effective public anti-counterfeiting features, including the watermark effect formed by the difference in the thickness of the paper fibers, and the gravure effect formed by the difference in the thickness of the ink accumulation. Banknotes may also include optically variable anti-counterfeiting features, such as color changing features, dynamic features, three-dimensional features, and identifiable features under point light sources. The identification and reliability of the anti-counterfeiting components are better.

Watermark is an effective means of protecting paper. Watermark is almost invisible when observed by reflection, and cannot be copied by digital equipment. However, when observed by light, it presents patterns through light and dark contrast, which can be well used for public observation and identification. The evaporated coating on the optical anti-counterfeiting product is selectively removed through the hollowing process to form partially light-transmitting areas and graphic features. It is also possible to position the printed word patterns on the front and back of the paper, so that when viewed through light, the word patterns on both sides of the paper are combined to form a pattern.

When anti-counterfeiting components are used in anti-counterfeiting products, they have the characteristics of high-contrast watermark and information coding, which make the anti-counterfeiting products have good anti-counterfeiting effect, easy for the public to identify, but not easy to imitate, and the identification and reliability of anti-counterfeiting products are better.

Fig. 4 schematically shows a flowchart of a method for manufacturing an anti-counterfeit element according to an embodiment of the present application. As shown in Figure 4, in one embodiment of the present application, a kind of method for manufacturing anti-counterfeiting element is provided, comprising the following steps:

Step 401, providing a first substrate;

Step 402, providing a microstructure embossing plate, the microstructure embossing plate has a relief microstructure;

Step 403, using a microstructure embossing plate to emboss a relief microstructure on the surface of the first substrate, whereby the surface of the first substrate includes a first region with a relief microstructure and a second region without a relief microstructure;

Step 404 forming a reflective layer on the surface of the first substrate;

Step 405, removing the reflective layer on the second area;

Step 406, forming a structural layer on the reflective layer;

Step 407, providing a second substrate and combining the second substrate with the structural layer.

In this embodiment, the image layer 200 includes a structural layer and a reflective layer, the translucent substrate 100 includes a first substrate and a second substrate, and the image layer 200 is located between the first substrate and the second substrate, that is, , the image layer 200 is located in the translucent substrate 100 .

Another method for manufacturing an anti-counterfeit element will be specifically described below with a specific embodiment. Fig. 5 schematically shows a flow chart of another method for manufacturing an anti-counterfeiting element according to an embodiment of the present application. As shown in Figure 5, in an embodiment of the present application, another method for manufacturing an anti-counterfeit element is provided, including the following steps:

Step 501, providing a plastic structural layer. A plastic with a thickness of 12 microns to 30 microns is provided as the structural layer of the image layer 200, and the plastic may be transparent PET plastic.

Step 502, providing a microstructure embossing plate. The microstructure embossing plate can be produced by various methods such as electron beam or laser direct writing. The period of the surface relief microstructure on the microstructure embossing plate is 1 micron to 20 microns, and the depth range is 0.1 micron to 2 microns. Cylindrical imprint plates can be formed by metallization processes such as electroforming.

Step 503, embossing microstructures on the plastic structure layer. Microstructures are replicated on plastics by processes such as roll-to-roll UV imprinting.

Step 504, evaporating the reflective layer. There is a metal reflective layer in the reflective layer. The metal reflective layer can be made by thermal evaporation, and the thickness range is 15 nanometers to 50 nanometers. The transmittance of the metal reflective layer for visible light is less than 10%. It can also be used in the reflective layer. A colored coating that is color matched to the translucent substrate 100.

Step 505 , removing the metal reflective layer in a part of the area (ie, the transparent area 201 ). CO ₂ or ultraviolet laser ablation can be used to form a coded pattern with a laser coding machine, or the method of printing protection and alkali washing and hollowing out can be used. The printing can use traditional printing presses or digital printing presses.

Step 506 , providing a translucent substrate 100 . The translucent substrate 100 can be paper with a thickness ranging from 50 microns to 150 microns, or a plastic substrate including a colored coating, the colored coating can be white, and the translucent substrate 100 has a light transmittance ranging from 25% to 100 microns. Between 75%.

Step 507 , combining the image layer 200 with the translucent substrate 100 . The translucent substrate 100 includes two opposite surfaces, and the image layer 200 can be pasted on any side of the translucent substrate 100 or stamped on any side of the translucent substrate 100 . The image layer 200 can also be embedded into the translucent substrate 100 during the manufacturing process of the translucent substrate 100 .

In this technical solution, since the image layer 200 includes a transparent region 201 with a higher light transmittance and an opaque region 202 with a lower light transmittance, and the image layer 200 is visible when viewed through transmission, the anti-counterfeiting element will Can present a high-contrast image; in addition, because the reflective properties of the opaque region 202 are the same or similar to those of the translucent substrate 100, the image layer 200 can be well hidden when viewed in reflection; this makes the anti-counterfeiting element Identification and reliability are better.

It should be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes no other elements specifically listed, or also include elements inherent in the process, method, commodity, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

The above are only examples of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may occur in this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

An anti-counterfeiting element, characterized in that it comprises:

translucent substrate;

an image layer on the surface of the translucent substrate or within the translucent substrate, the image layer comprising transparent regions for visible light and opaque regions, the reflective properties of the opaque regions being comparable to those of the translucent substrate With the same or similar reflective properties, the image layer is invisible when viewed in reflection and is visible when viewed in transmission.
The anti-counterfeiting element according to claim 1, characterized in that the light transmittance of the translucent substrate is in the range of 25%-75%.
The anti-counterfeiting element according to claim 1, characterized in that the light transmittance of the transparent area is higher than 75%.
The anti-counterfeiting element according to claim 1, characterized in that the light transmittance of the opaque region is lower than 10%.
The anti-counterfeit element according to claim 1, wherein the translucent substrate comprises plastic.
The anti-counterfeiting element according to claim 1, wherein the translucent substrate comprises paper.
The anti-counterfeit element according to claim 6, wherein the paper contains cotton fibers.
The anti-counterfeiting element according to claim 7, characterized in that the light transmittance of the paper is in the range of 30%-60%.
The anti-counterfeiting element according to claim 7, characterized in that, the thickness of the paper is in the range of 75 microns to 150 microns.
The anti-counterfeit element according to claim 7, wherein the paper has watermarks formed due to different thicknesses of the paper.
The anti-counterfeiting element according to claim 1, wherein the image layer comprises:

structural layer; and

A reflective layer located on the surface of the structural layer, the reflective layer covering a part of the structural layer to form the opaque region.
The anti-counterfeiting element according to claim 11, wherein a relief microstructure is provided on the surface of the structural layer located in the opaque region, and the reflective layer is conformally formed on the relief microstructure.
The anti-counterfeiting element according to claim 12, wherein the relief microstructure comprises a diffraction grating structure.
The anti-counterfeiting element according to claim 12, wherein the relief microstructure includes surfaces with different inclination angles, so that the reflective layer forms reflective mirror surfaces with different inclination angles.
The anti-counterfeiting element according to claim 11, characterized in that the reflective layer comprises a color layer such that the opaque region is consistent with the color of the substrate when viewed in reflection.
The anti-counterfeit element according to claim 11, characterized in that, the reflective layer comprises metal aluminum coating.
Security element according to claim 11, characterized in that the structural layer comprises thermoplastic polyester PET plastic.
The anti-counterfeit element according to claim 1, wherein the image layer is presented as a one-dimensional code or a two-dimensional code.
The anti-counterfeiting element according to claim 1, wherein the translucent base material includes an optically variable anti-counterfeiting element, and the optically variable anti-counterfeiting element includes color changing features, dynamic features, three-dimensional features and point light sources that can At least one of the features is identified.
The anti-counterfeiting element according to claim 1, wherein the translucent base material includes a gravure pattern formed due to different ink accumulation thicknesses.
The anti-counterfeiting element according to claim 1, further comprising: a transparent adhesive layer combining the translucent substrate and the image layer.
The anti-counterfeiting element according to claim 1, characterized in that, the translucent substrate comprises a laminated transparent structural layer and a translucent coating.
The anti-counterfeiting element according to claim 18, characterized in that, the making of the image layer includes a digital printing process or a printing process.
The anti-counterfeiting element according to claim 18, characterized in that, the fabrication of the image layer includes a laser ablation process.
An anti-counterfeit product, characterized by comprising the anti-counterfeit element according to any one of claims 1-24.
The anti-counterfeit product according to claim 25, characterized in that the anti-counterfeit product comprises banknotes or certificates.
The anti-counterfeit product according to claim 26, characterized in that the certificate includes at least one of a bank card, a cash card, an authorization card, an ID card and a passport.
A method for manufacturing an anti-counterfeiting element, comprising:

providing a first substrate;

providing a microstructured embossing plate having a relief microstructure;

The microstructure embossing plate is used to emboss the relief microstructure on the surface of the first substrate, whereby the surface of the first substrate includes a first region with the relief microstructure and without the relief microstructure. the second region of the relief microstructure;

forming a reflective layer on the surface of the first substrate;

removing the reflective layer on the second region;

forming a structural layer on the reflective layer;

A second substrate is provided, and the second substrate is bonded to the structural layer.