CN108790469B - Optical anti-counterfeiting element and anti-counterfeiting product - Google Patents

Optical anti-counterfeiting element and anti-counterfeiting product Download PDF

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Publication number
CN108790469B
CN108790469B CN201710287523.2A CN201710287523A CN108790469B CN 108790469 B CN108790469 B CN 108790469B CN 201710287523 A CN201710287523 A CN 201710287523A CN 108790469 B CN108790469 B CN 108790469B
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China
Prior art keywords
layer
optical
security element
coding pattern
pattern
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CN201710287523.2A
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CN108790469A (en
Inventor
王晓利
朱军
李欣毅
孙凯
张宝利
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China Banknote Printing And Minting Group Co ltd
Zhongchao Special Security Technology Co Ltd
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China Banknote Printing and Minting Corp
Zhongchao Special Security Technology Co Ltd
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Priority to CN201710287523.2A priority Critical patent/CN108790469B/en
Publication of CN108790469A publication Critical patent/CN108790469A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40Manufacture
    • B42D25/45Associating two or more layers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery

Abstract

The invention relates to the field of optical anti-counterfeiting, and discloses an optical anti-counterfeiting element suitable for various high-safety or high-value-added printed matters such as banknotes, cards, product packages and the like. The optical anti-counterfeiting element comprises a substrate, wherein at least a partial area of one surface of the substrate is provided with a coding pattern, the coding pattern is composed of a first part and a second part which are interwoven together, and the coding pattern reproduces preset information through decoding; and filling the first part of the coding pattern with a first type of optical microstructure, wherein emergent light is spatially separated from specular reflection light and/or direct transmission light when a beam of light irradiates the first optical microstructure. The anti-counterfeiting element not only has the visual characteristic of one-line public anti-counterfeiting, but also has the hidden information of two-line anti-counterfeiting. In addition, the optical anti-counterfeiting element is applied to products needing to be protected in the forms of window opening safety lines, hot stamping wide strips, stickers, marks and the like.

Description

Optical anti-counterfeiting element and anti-counterfeiting product
Technical Field
The invention relates to the field of anti-counterfeiting, in particular to an optical anti-counterfeiting element, a manufacturing method thereof and an anti-counterfeiting product with the optical anti-counterfeiting element.
Background
In order to prevent counterfeiting, optical anti-counterfeiting technology is widely adopted in various high-safety and high-value-added printed matters such as bank notes, cards and the like, and a very good effect is achieved. For example, new Euro and Canada plastic banknotes use a wide band of diffractive optically variable images and a 100 dollar coupon dollar called "dollarThe micro-lens security line adopts an optically variable security line for a new 100-element RMB, diffraction optically variable image thermoprinting marks are adopted for Visa, MasterCard and China Unionpay credit cards, and diffraction optically variable image anti-counterfeiting technology is adopted for important certificates such as national identity cards, drivers licenses, passports and the like. To date, most security cards such as banknotes, credit cards, passports and the like in the world adopt optical anti-counterfeiting technology.
The optical anti-counterfeiting technology generally adopts a certain optical microstructure to generate a special optical effect, presents a special visual effect which is difficult to forge, and achieves the aim of mass anti-counterfeiting. However, the visual effect of mass anti-counterfeiting alone cannot meet the existing market demand.
Therefore, the invention aims to realize an optical anti-counterfeiting element which not only has a first-line public anti-counterfeiting feature, but also has a second-line hidden anti-counterfeiting feature through the design of the optical microstructure.
Disclosure of Invention
The invention aims to overcome the problem of singularization of anti-counterfeiting characteristics in the prior art, and provides an optical anti-counterfeiting element which has the technical effects of a first-line public anti-counterfeiting characteristic and a second-line hidden anti-counterfeiting characteristic.
In order to achieve the above object, the present invention provides an optical security element, which comprises a substrate, at least a partial area of one surface of the substrate is provided with a coding pattern, the coding pattern is composed of a first part and a second part which are interwoven with each other, and the coding pattern reproduces preset information through decoding; and filling the first part of the coding pattern with a first type of optical microstructure, wherein emergent light is spatially separated from specular reflection light and/or direct transmission light when a beam of light irradiates the first optical microstructure.
Preferably, when the illumination light is emitted into the optical anti-counterfeiting element, an included angle between the emergent light and the specular reflection light and/or the straight light transmission is larger than 10 degrees.
Preferably, the line width of the first portion of the coding pattern and/or the second portion of the coding pattern is greater than 2 microns, less than a scale that is resolved by the human eye.
Preferably, the coding pattern is a fourier transform pattern, a fresnel transform pattern, a moire coding pattern, a bar code, a two-dimensional code, a hilbert transform pattern, an abelian transform pattern, a mellin transform pattern, or various customized transform patterns.
Preferably, the first optical microstructure is one of a non-diffractive microstructure, a diffractive microstructure, or a combination thereof.
Preferably, the non-diffractive microstructures have a dimension greater than 5 microns; the diffractive microstructure has a dimension of between 0.5 and 5 microns.
Preferably, the second portion of the coding pattern is a flat portion or is filled with the second optical microstructures.
Preferably, the first portion of the coding pattern is convex and the second portion of the coding pattern is concave.
Preferably, the second portion of the coding pattern is filled with the second optical microstructures or the first optical microstructures.
Preferably, the substrate is a polyvinyl chloride (PVC) plate, a polyethylene terephthalate (PET) plate, a Polycarbonate (PC) plate or a glass plate.
Preferably, the optical security element further comprises: a functional layer located between the substrate and the coding pattern.
Preferably, the functional layer is a peeling layer, a reinforcing layer, a protective layer, a magnetic layer, a fluorescent layer, a microstructure forming layer, a metal reflecting layer, a high refractive index medium layer, a multilayer medium layer or a metal medium multilayer structure layer.
Preferably, the optical security element further comprises: an overlay layer over the coding pattern.
Preferably, the covering layer is a metal reflecting layer, a high refractive index medium layer, a plurality of medium layers, a metal medium multi-layer structure layer, a nano metal ink or nano metal coating layer, a protective layer, a magnetic layer, a fluorescent layer, a printing pattern layer or an adhesive layer.
Preferably, the cover layer covers the coding pattern in its entirety or in parts.
Preferably, the optical security element is a reflective and/or transmissive element.
In a second aspect, the invention provides a security product comprising an optical security element according to the invention.
Through the technical scheme, the coding pattern reproduces preset information through decoding, and the first optical microstructure is filled in the first part of the coding pattern, so that a certain optical visual effect is presented when the coding pattern is observed by naked eyes, the optical anti-counterfeiting element has the technical effects of a public anti-counterfeiting feature of a first line and a hidden anti-counterfeiting feature of a second line, and the anti-counterfeiting effect is greatly improved. The anti-counterfeiting product can be various high-safety or high-added-value products such as bank notes, identification cards, product packages and the like which use the optical anti-counterfeiting element as a windowing safety line, a label, a sticker or a window.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic view of a security device according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of the region of the coding pattern of the security element of FIG. 1 according to the present invention;
fig. 3 is a schematic cross-sectional structure diagram of a security device according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure diagram of a security element according to another embodiment of the present invention;
fig. 5 is a schematic cross-sectional structure diagram of a security element according to a preferred embodiment of the present invention; and
fig. 6 is a schematic cross-sectional structure diagram of a security element according to another preferred embodiment of the present invention.
Description of the reference numerals
1 optical element 101 coding pattern
102 first part of further region 201
202 second portion 301 optical microstructure
302 base material
Detailed Description
The optical security element and the product using the same according to the present invention will be described in detail below with reference to the accompanying drawings in order to better understand the idea of the present invention. It should be understood that the drawings and detailed description are only illustrative of preferred embodiments of the invention and are not intended to limit the scope of the invention in any way.
The optical element 1 shown in fig. 1 is an embodiment of the present invention, said optical element 1 comprising a coding pattern 101, optionally further comprising a further area 102. The code pattern 101 is a pattern obtained by encoding an original pattern, that is, predetermined information, and the predetermined information is reproduced by decoding the code pattern 101, thereby providing hidden information for two-line forgery prevention.
Fig. 2 schematically shows a partially enlarged view of the coding pattern 101 in the schematic view of the security element 1 shown in fig. 1, where the coding pattern 101 includes a first portion 201 (white area) and a second portion 202 (black area) that are interwoven with each other, in other words, the first portion 201 and the second portion 202 are in a male-female complementary relationship, and the first portion 201 of the coding pattern 101 is filled with a first type of optical microstructure 301 (see fig. 3 and 4). When a beam of light irradiates the first optical microstructure, emergent light is in a direction different from a specular reflection direction and/or a direction different from a direct transmission light direction, and the emergent light is required to be separated from the specular reflection light and/or the direct transmission light in space, so that certain optical visual effect observed by naked eyes is generated. In order to ensure that the emergent light and the specular reflection light and/or the direct transmission light are spatially separated and generate an obvious visual effect, the included angle between the emergent light and the specular reflection light and/or the direct transmission light is generally required to be greater than 10 degrees when the illumination light is emitted into the optical anti-counterfeiting element.
Fig. 3 shows an enlarged partial cross-sectional view of the coding pattern 101 of the security element 1 according to one embodiment of the invention from fig. 1. The anti-counterfeiting element 1 comprises a substrate 302 and a coding pattern 101 formed on the surface of the substrate 302, wherein the coding pattern 101 comprises a first portion 201 and a second portion 202 which are interwoven together, the first portion 201 is filled with a first optical microstructure 301, and the second portion 202 is a flat portion or is filled with another optical microstructure.
Fig. 4 schematically shows an enlarged partial cross-sectional view of a coding pattern 101 of the security element 1 according to another embodiment of the invention, as shown in fig. 1. The anti-counterfeiting element 1 comprises a substrate 302 and a coding pattern 101 formed on the surface of the substrate 302, wherein the coding pattern 101 comprises a first portion 201 and a second portion 202 which are interwoven together, lines of the first portion 201 are convex and filled with first optical microstructures 301, lines of the second portion 202 are concave, and optionally, the second portion 202 is filled with optical microstructures. Based on the above-mentioned concave-convex structure, the optical microstructures filled in the second portion 202 may be the same as the first optical microstructures 301. Since the second portion 202 is also filled with optical microstructures, the brightness of the optical visual effect of the security element can be increased.
Preferably, the line width of the first portion 201 and/or the second portion 202 of the coding pattern 101 is generally greater than 2 microns and smaller than the dimension resolved by the human eye. This is because, on the one hand, the code pattern is usually not expected to exhibit significant diffraction phenomena, and, on the other hand, the code pattern is advantageously invisible to the naked eye for the visual effect of the optical element 1 and for the concealment of the two-line information. The resolution of the viewing angle of the human eye is about 1 minute, and the resolution distance of the human eye is about 0.07 mm at a distance of photopic vision (250 mm).
Several forms of the coding pattern 101 are exemplified below.
The coding pattern 101 may be a fourier transform pattern, i.e. a fourier pattern obtained by fourier transforming an original pattern. The fourier transform pattern may be calculated by a computer or may be obtained by optical transformation.
The coding pattern 101 may be a fresnel transformed pattern, i.e. a fresnel transformed pattern obtained by fresnel transforming an original pattern. The fresnel transformation pattern can be calculated by a computer or can be obtained by optical transformation.
The coding pattern 101 may be a moire coding pattern, i.e. a design key plate and an original pattern, which are obtained by moire coding.
The coding pattern 101 may be a bar code, a two-dimensional code, a hilbert transform pattern, an abelian transform pattern, a mellin transform pattern, and various customized transform patterns.
Upon decoding, the coding pattern 101 presents a hidden original image. The decoding process is actually the inverse of the encoding process. Different coding modes and different specific decoding means are available.
The Fourier transform pattern and Fresnel transform pattern can be read into a computer, decoded by the computer, and the original image can be reproduced on the computer screen. The hidden original image can also be reproduced at a suitable distance using optical transform decoding, i.e. a beam of light (usually laser light) illuminates the coding pattern 101.
The Moire coding pattern is decoded through the key plate, namely the decoding of the key plate is overlapped on the key plate to adjust the direction and align, and then the hidden original image can be reproduced. The virtual key plate may be stored in a computer, and the moire code pattern may be read into the computer and decoded by a program.
The barcode, the two-dimensional code, the hilbert transform pattern, the abelian transform pattern, the mellin transform pattern, and the like need to be decoded by a computer.
The first type of optical microstructures filled in the first portion 201 of the coding pattern 101 will be explained below (the same applies to the optical microstructures filled in the second portion 202).
The first optical microstructure may be a non-diffractive microstructure, a diffractive microstructure, or a combination thereof.
The non-diffractive microstructure refers to an optical microstructure with a relatively large scale, i.e. no or negligible diffractive effect, and generally refers to an optical microstructure with a scale larger than 5 micrometers, such as a micro-mirror, a micro-prism, a micro-lens, and the like. By reasonably designing parameters such as the surface shape, azimuth angle, inclination angle, size and the like of the non-diffraction microstructure, images with dynamic, three-dimensional and other visual effects can be obtained, and metal reflecting layers, high-refractive-index dielectric layers, multi-layer dielectric coating layers, metal dielectric layers and other coating layers are evaporated on the surface of the non-diffraction microstructure, so that richer visual effects can be generated.
The diffractive microstructure refers to an optical microstructure with a significant diffractive effect, and generally refers to an optical microstructure with a dimension (period for a diffraction grating) between 0.5 and 5 micrometers. The diffraction microstructure is an optical anti-counterfeiting structure which is most widely applied at present, and meanwhile, metal reflecting layers, high-refractive-index dielectric layers, multi-layer dielectric coating layers, metal dielectric layers and other coating layers are evaporated on the surface of the diffraction microstructure, so that richer visual effects can be generated. The chinese patent applications 201310269077.4, 201310269992.3, 201410377283.1 are incorporated herein by reference, and the product structure and design and fabrication method thereof can be used as the product structure and design and fabrication method of the diffraction microstructure of the present invention.
The substrate 201 may be a polyvinyl chloride PVC plate, a polyethylene terephthalate PET plate, a polycarbonate PC plate, a glass plate, etc., or one or more layers of functional coating materials may be coated on the surface of these base materials, and how to arrange the functional coating materials is determined according to the specific requirements of the product, and optionally, the functional layers include, but are not limited to, a peeling layer, an enhancement layer, a protection layer, a magnetic layer, a fluorescent layer, a microstructure forming layer, a metal reflective layer, a high refractive index medium layer, a multi-layer medium layer, a metal medium multi-layer structure layer, etc.
Optionally, a cover layer is formed on the coding pattern 101, where the cover layer may be a single layer or multiple layers, and may be matched with the optical microstructure 301 to enhance the optical effect thereof or generate a new optical effect, and may also have functions of protection, adhesion, and the like, and may also have technical features of fluorescence, magnetism, and the like. The covering layer can be covered wholly or partially so as to form a visible pattern. Optionally, the cover layer includes, but is not limited to, a metal reflective layer, a high refractive index dielectric layer, a multi-layer structure layer of a metal dielectric, a nano-metallic ink or nano-metallic paint layer, a protective layer, a magnetic layer, a fluorescent layer, a print pattern layer, an adhesive layer, etc.
The optical anti-counterfeiting element can be a transmission element, namely an optical anti-counterfeiting element for transmission observation.
The optical anti-counterfeiting element can be a reflecting element, namely an optical anti-counterfeiting element for reflecting observation. Through reasonable design, the effect that two sides present different color characteristics can be realized.
The optical anti-counterfeiting element can be a reflection/transmission element, namely, transmission observation and reflection observation. Through reasonable design, the effects that the reflection and the transmission present the same color characteristics, the reflection and the transmission present different color characteristics and the like can be realized.
The anti-counterfeiting element can be transferred or pasted on a bearing object in the forms of identification, hot stamping wide strips, pasting strips, safety lines and the like. These carriers can be high-safety products such as bank notes, securities, credit cards, passports and the like, and can also be high-value-added commodities.
Example 1
Fig. 5 shows a preferred embodiment of the present invention. The substrate 302 comprises a PET (or other sheet material) 3021 and a first functional layer 3022 coated on the surface of the PET3021, and an encoding pattern 101 formed on the first functional layer 3022, wherein the encoding pattern 101 comprises a first portion 201 and a second portion 202 interwoven with each other, the first portion 201 is filled with the first optical microstructure 301, and the second portion 202 is a flat portion. The first functional layer 3022 may be a single layer or a plurality of layers. For example, the first functional layer 3022 may be an embossed replica layer for high quality formation of the optical microstructure 301; in order to increase the fastness between the embossing duplicate layer and the PET, an adhesion enhancement layer is additionally arranged between the PET and the embossing duplicate layer; if the final product is a hot stamping product, a stripping layer needs to be additionally arranged between the PET and the mould pressing replication layer; and a layer with the characteristics of fluorescence, magnetism and the like can be additionally arranged between the PET and the embossing copy layer. A plating layer 303 is deposited on the surface (where the optical microstructure 301 is transferred) of the first functional layer 3022, and the second functional layer 304 is coated on the plating layer 303. The plating layer 303 may be a single-layer dielectric layer, a multi-layer dielectric layer, a single-layer metal layer, an optically variable plating layer with a three-layer structure of metal (reflective) layer/dielectric layer/metal (absorptive layer), and the like, and the plating layer 303 may be complete or patterned. The second functional layer 304 may be a single layer or multiple layers, and may include an adhesive layer, a protective layer, a fluorescent layer, a magnetic layer, a printed pattern, and the like.
Example 2
Fig. 6 shows another preferred embodiment of the present invention. This embodiment is the same as the embodiment shown in fig. 5, and the same reference numerals denote the same meanings, and the description of the same parts will be omitted. The lines of the first portion 201 are convex and filled with the first optical microstructures 301, the lines of the second portion 202 are concave, and optionally, the second portion 202 is filled with the optical microstructures. The protrusions 201, recesses 202 and filled optical microstructures of the first type 301 and optionally the second portion 202 are formed on an embossed replica layer.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims (17)

1. An optical security element comprising a substrate, at least a partial area of one surface of which bears a coding pattern consisting of a first part and a second part which are interwoven with one another,
the encoding pattern reproduces preset information by decoding; and
the first part of the coding pattern is filled with first optical microstructures, and when a beam of light irradiates the first optical microstructures, emergent light is in a direction different from a specular reflection direction and/or a direction different from a direct transmission light, and the emergent light is spatially separated from the specular reflection light and/or the direct transmission light.
2. An optical security element according to claim 1, wherein the angle between the outgoing light and the specularly reflected light and/or the directly transmitted light is greater than 10 degrees when illumination light is incident on the optical security element.
3. An optical security element according to claim 1, wherein the first portion of the coding pattern and/or the second portion of the coding pattern has a line width of more than 2 microns, less than the scale resolved by the human eye.
4. An optical security element according to claim 1, wherein the coding pattern is a fourier transform pattern, a fresnel transform pattern, a moire coding pattern, a bar code, a two-dimensional code, a hilbert transform pattern, an abelian transform pattern, a mellin transform pattern or various custom transform patterns.
5. An optical security element according to claim 1, wherein the first optical microstructure is one of a non-diffractive microstructure, a diffractive microstructure or a combination thereof.
6. An optical security element according to claim 5, wherein the non-diffractive microstructure has dimensions greater than 5 microns; the diffractive microstructure has a dimension of between 0.5 and 5 microns.
7. An optical security element according to claim 1, wherein the second part of the coding pattern is a flat part or is filled with the second type of optical microstructures.
8. An optical security element according to claim 1, wherein the first part of the coding pattern is a protrusion and the second part of the coding pattern is a depression.
9. An optical security element according to claim 8, wherein the second portion of the coding pattern is filled with the second optical microstructure or the first optical microstructure.
10. An optical security element according to claim 1, wherein the substrate is a polyvinyl chloride (PVC) sheet, a polyethylene terephthalate (PET) sheet, a Polycarbonate (PC) sheet or a glass sheet.
11. An optical security element according to claim 1, further comprising: a functional layer located between the substrate and the coding pattern.
12. An optical security element according to claim 11, wherein the functional layer is:
one of a peeling layer, a reinforcing layer, and a protective layer; or
One of a magnetic layer and a fluorescent layer; or
The microstructure forms a layer.
13. An optical security element according to claim 1, further comprising: an overlay layer over the coding pattern.
14. An optical security element according to claim 13, wherein the cover layer is:
the coating is an optically variable coating with a single-layer medium layer, a plurality of medium layers, a single-layer metal layer or a metal layer/medium layer/metal layer three-layer structure; or
One of a nano-metallic ink and a nano-metallic coating layer; or
One of a magnetic layer, a fluorescent layer and a print pattern layer; or
One of a protective layer and an adhesive layer.
15. An optical security element according to claim 13, wherein the cover layer covers the coding pattern in its entirety or in part.
16. An optical security element according to claim 1, wherein the optical security element is a reflective and/or transmissive element.
17. A security product comprising an optical security element according to any one of claims 1 to 16.
CN201710287523.2A 2017-04-27 2017-04-27 Optical anti-counterfeiting element and anti-counterfeiting product Active CN108790469B (en)

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CN112572014B (en) * 2019-09-30 2022-05-27 中钞特种防伪科技有限公司 Optical anti-counterfeiting element and anti-counterfeiting product
ES2817926B2 (en) * 2019-10-04 2021-11-12 Univ Murcia VISUAL CODE AND PROCEDURE TO ENCODE AND DECODE A TWO-DIMENSIONAL IMAGE
CN111572236B (en) * 2020-04-29 2021-09-10 中山大学 Anti-counterfeiting element combining optical encryption and digital encryption and manufacturing method thereof
CN114619784A (en) * 2022-01-21 2022-06-14 中钞印制技术研究院有限公司 Transparent security element, method and device for producing the same, security article, storage medium

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