CN111761962B

CN111761962B - Security element

Info

Publication number: CN111761962B
Application number: CN202010731725.3A
Authority: CN
Inventors: 冯广义
Original assignee: Anhui Yuanshangcao Energy Saving And Environmental Protection Technology Co ltd
Current assignee: Anhui Yuanshangcao Energy Saving And Environmental Protection Technology Co ltd
Priority date: 2018-07-20
Filing date: 2018-07-20
Publication date: 2021-07-23
Anticipated expiration: 2038-07-20
Also published as: CN111791629A; CN108909266B; CN111791629B; CN108909266A; CN111761962A

Abstract

The invention relates to a security element, wherein a microstructure layer (2) arranged on the upper surface forms a first pattern in a first area (3), a friction reversible discoloration layer (7), the friction reversible discoloration layer (7) printed on the upper surface forms a second pattern in a second area (8) arranged at a distance from the first area (3) by gravure printing, a 3D printing layer (9) formed by 3D printing on the upper surface forms a third pattern in a third area (10) arranged at a distance from the first area (3) and the second area (8), a transparent film layer (11) covering the first, second and third areas emits a second color light under the irradiation of ultraviolet rays of 375nm, and a microlens unit array (12) arranged on the lower surface corresponding to the first area comprises a plurality of spherical microlens units distributed at uniform intervals.

Description

Security element

Technical Field

The invention belongs to the field of anti-counterfeiting, and particularly relates to a safety element.

Background

This application is application No. 201810805114.1 entitled divisional application of a security element, method of manufacture and security document, the disclosure of which is incorporated in its entirety.

Since certificate cards, tickets, branded goods, and important security documents are involved in public security and/or important economic benefits, new technologies, new materials, and new concepts are continuously applied therein to keep the anti-counterfeiting technology ahead of counterfeiters. Meanwhile, since the certificate cards, tickets and commodities are mainly circulated in the public field, one of the main requirements of the optical anti-counterfeiting technology is easy public identification. With the development of science and technology, anti-counterfeiting devices capable of carrying more information become more mainstream of anti-counterfeiting, and the anti-counterfeiting devices are used for protecting security documents and valuable documents from counterfeiting or copying, and various anti-counterfeiting devices with anti-counterfeiting functions have been developed. For example: by using the optical variable technology, counterfeiting and forgery of the valuable articles by copying, scanning and other forgery modes can be effectively identified. Since the imaging system used in the optically variable technology records information of scattered light on the surface of a copied object, a counterfeit having an optically variable effect cannot be copied by a counterfeit method such as copying or scanning. Moreover, the anti-counterfeiting device manufactured by using the optical variation technology has the characteristic of color variation along with the angle, is easy to identify by the public, and is helpful for preventing the propagation of counterfeits from the circulation field. The anti-counterfeiting device can display different visual images to a viewer at different angles from the visual characteristics of human eyes, such as: different colors, along with different observation angles, the change of the pattern color is easy to attract people's attention, and the anti-counterfeiting feature can be used for an observer to conveniently and quickly judge the authenticity of valuable articles, protect the vital economic benefits of the public, block the circulation of counterfeit articles from the widest field and be widely applied in recent years.

With the continuous development and marketization of the optical variable technology, the counterfeiting means is gradually improved, so that the optical variable element is easier to imitate, the anti-counterfeiting performance is reduced, the application of the multilayer optical film with the effect of color along with the angle in the gift and high-grade commodity packaging aspect is more and more common, and the anti-counterfeiting effect of the technology along with the angle is challenged. Therefore, with the social demands for higher anti-counterfeiting technologies, higher requirements for anti-counterfeiting are put forward, and security elements must be continuously improved.

The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

Disclosure of Invention

The present inventors have made intensive studies to achieve the above object, and specifically, the present invention provides a security element including:

a transparent carrier layer comprising an upper surface and a lower surface,

the microstructure layer is arranged on the upper surface and forms a first pattern in a first area, the microstructure layer comprises a metal layer, a dielectric layer and a metal film layer, a plurality of concave-convex microstructures are uniformly distributed on the outer surface of the microstructure layer, the outline shape and/or the peak-valley depth of the concave-convex microstructures enable the microstructure layer to have a reflectivity lower than 7% in a first spectral range and a reflectivity higher than 70% in a second spectral range, and the microstructure layer has a polarization selective dynamic pattern,

a rubbed reversible color changing layer, the rubbed reversible color changing layer printed on the upper surface of the rubbed reversible color changing layer forms a second pattern in a second area arranged at intervals with the first area, the rubbed reversible color changing layer comprises reversible thermochromic microcapsules developing a color for a predetermined time after rubbing, reversible thermochromic particles in the reversible thermochromic microcapsules comprise 1, 2-benzo-6- (N-ethyl-N-isoamylamino) fluorane, N-octyl p-hydroxybenzoate, N-tridecyl stearate and a pigment agent, the second pattern and the first pattern are matched with each other to form a first anti-counterfeiting identification mark, the second pattern is a number symbol arranged according to a first arrangement, the first pattern is a number symbol arranged in a second arrangement, and the first pattern and the second pattern are matched with each other to form a complete number sequence,

a 3D printed layer formed by 3D printing on the upper surface, the 3D printed layer forming a third pattern in a third region spaced apart from the first region and the second region, the 3D printed layer comprising a 3D printed material emitting a first color light under co-irradiation of 375nm ultraviolet light and 850nm infrared light, the 3D printed layer emitting a second color light under single irradiation of 375nm ultraviolet light, the 3D printed material comprising rare earth dopants, comprising: ge4+₂Mg2+₂Yb3+₂Si4+₃Ga3+₆O₂₃: 0.4Yb3+, 0.4Cr 3+, the third pattern cooperating with the first and second patterns, respectively, to form second and third false proof identification marks, the first, second and/or third regions being of the same size;

a transparent thin film layer covering the first, second and third regions and emitting a third color light under 375nm ultraviolet irradiation, the transparent thin film layer being formed by melt blowing an excitation powder consisting of 77-80 parts by weight of NH, a silane coupling agent and a polyester terephthalate₄H₂PO₄2-3 parts by weight of lithium carbonate, 12-14 parts by weight of sodium carbonate, 8-10 parts by weight of potassium carbonate, 3-4 parts by weight of europium trioxide and 1-2 parts by weight of cerium trioxide are melted and then crushed to form the powder,

a microlens unit array, which is arranged on the lower surface corresponding to the first area and comprises a plurality of spherical microlens units which are uniformly distributed at intervals, and the stereoscopic pattern is formed by observing the microstructure layer through the microlens unit array,

and the magnetic coding array is arranged at the position of the lower surface corresponding to the second area and/or the third area and comprises a plurality of magnetic codes which are arranged according to a preset sequence, the cross section of each magnetic code comprises a bevel edge inclined along the arrangement direction, the inclination angle of the bevel edge is 40-50 degrees, and the thickness of the magnetic code is gradually increased along one side close to the bevel edge.

In the security element, the transparent carrier layer is a flexible transparent layer of polymethyl methacrylate having a thickness of 30 to 35 microns.

In the safety element, the metal layer is a chromium metal layer with the thickness of 50-60 nanometers, the dielectric layer is a polyvinyl chloride layer with the thickness of 10-20 nanometers, and the metal film layer is an aluminum metal film layer with the thickness of 8-12 nanometers.

In the security element, the reversible thermochromic microcapsules are formed through an in-situ polymerization method, the reversible thermochromic microcapsules have a particle size of 1.5-2 microns, and when the reversible color changing layer is rubbed, the reversible thermochromic microcapsules develop a second color from a first color and recover to the first color after a predetermined time.

In the security element, the reversible thermochromic particles comprise 5-10 parts by weight of 1, 2-benzo-6- (N-ethyl-N-isoamylamino) fluorane, 15-30 parts by weight of N-octyl p-hydroxybenzoate, 60-80 parts by weight of N-tridecyl stearate and 20-30 parts by weight of pigment.

In the safety element, germanium oxide, magnesium oxide, yttrium oxide, silicon oxide and gallium oxide are fully ground and mixed, and then an activator containing chromium oxide is added to react at 1300-1320 ℃ for 10 hours to obtain the rare earth dopant.

In the safety element, the transparent film layer is formed by melting and blowing 10-12 parts by weight of excitation powder with the particle size of 150-200 nanometers, 0.5-0.8 part by weight of silane coupling agent and 87-90 parts by weight of polyester terephthalate.

In the safety element, the infrared detection layer is arranged on the lower surface corresponding to the second area and/or the third area and is different from the position of the magnetic coding array and comprises the CaCuSi₄O₁₀A crystalline phase of a luminescent material that emits infrared light under irradiation of natural light.

In the security element, the transparent carrier layer has a watermark or security thread.

In the security element, the second and third tamper evident indicia which the third pattern cooperates with the first and second patterns respectively to form are both numeric symbols.

The invention has the following technical effects:

according to the security element of the invention, the microstructure layer of the invention forms a first pattern in the first region, which provides a first security feature, and the microstructure layer has a reflectivity of less than 7% in the first spectral range and a reflectivity of more than 70% in the second spectral range, which improves the legibility and security of the first pattern. The formation of the second pattern in the second region by the tribologically reversible color-changing layer of the invention provides a second security feature, the tribologically reversible color-changing layer develops a predetermined time after rubbing, which significantly improves the security of the second pattern, further, the second pattern and the first pattern cooperate with each other to form a first security identification mark, which provides a composite third security feature, the formation of the third pattern in the third region by the 3D printing layer of the invention provides a fourth security feature, the 3D printing layer comprises emission of a first color light under co-irradiation of 375nm ultraviolet light and 850nm infrared light, the 3D printing layer emits a second color light different from the first color light under irradiation of 375nm ultraviolet light, which significantly improves the security and identifiability of the fourth security feature, the third pattern cooperates with the first pattern and the second pattern, respectively, to form a second and a third security identification mark, this provides a composite fifth and sixth security feature, the transparent film layer of the present invention emits a third color light under 375nm uv irradiation, further improving the visibility and anti-counterfeiting, viewing the microstructured layer through the microlens array to form a three-dimensional pattern, which provides a seventh security feature, a plurality of magnetic codes arranged in a predetermined order, each of the magnetic codes having a cross-section comprising a hypotenuse inclined in the direction of arrangement at an angle of 40-50 degrees, the thickness of the magnetic code increases progressively closer to the beveled side, and the array of magnetic codes forms a unique security device, which provides an eighth security feature, the thickness of the bevel edge of the magnetic code and the inclination angle of the bevel edge are controlled to enable the detected waveform to have unique anti-counterfeiting performance, so that the anti-counterfeiting performance is obviously improved.

Drawings

Fig. 1 is a schematic view of the overall structure of a security element of one embodiment of the security element of the present invention.

Fig. 2 is a schematic cross-sectional view of a magnetically encoded array of security elements of one embodiment of the security element of the present invention.

Fig. 3 is a schematic representation of the steps of the method of making the security element of the present invention.

Detailed Description

Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.

For the purpose of facilitating an understanding of the embodiments of the present invention, the following description will be made in terms of several specific embodiments with reference to the accompanying drawings, and the drawings are not intended to limit the embodiments of the present invention.

Specifically, as shown in fig. 1, the security element of the present invention includes:

a transparent carrier layer 1, comprising an upper surface and a lower surface,

the microstructure layer 2 is arranged on the upper surface, the microstructure layer 2 forms a first pattern in a first area 3, the microstructure layer 2 comprises a metal layer 4, a dielectric layer 5 and a metal film layer 6, a plurality of concave-convex microstructures are uniformly distributed on the outer surface, the outline shape and/or the peak-valley depth of the concave-convex microstructures enable the microstructure layer 2 to have a reflectivity lower than 7% in a first spectral range and a reflectivity higher than 70% in a second spectral range,

a rubbed reversible color-changing layer 7, the rubbed reversible color-changing layer 7 gravure-printed on the upper surface forming a second pattern in a second region 8 disposed spaced apart from the first region 3, the rubbed reversible color-changing layer 7 comprising reversible thermochromic microcapsules developing color for a predetermined time via rubbing, the reversible thermochromic particles in the reversible thermochromic microcapsules comprising 1, 2-benzo-6-N-ethyl-N-isopentylaminofluoran, N-octyl paraben, N-tridecyl stearate, and a pigment agent, the second pattern and the first pattern cooperating with each other to form a first forgery-proof identification mark,

a 3D printed layer 9, the 3D printed layer 9 formed by 3D printing on the upper surface forming a third pattern in a third area 10 arranged at a distance from the first area 3 and the second area 8, the 3D printed layer 9 comprising a 3D printed material emitting a first color light under co-irradiation of 375nm ultraviolet light and 850nm infrared light, the 3D printed layer 9 emitting a second color light under separate irradiation of 375nm ultraviolet light, the 3D printed material comprising rare earth dopants, comprising the following: ge4+₂Mg2+₂Yb3+₂Si4+₃Ga3+₆O₂₃: 0.4Yb3+, 0.4Cr 3+, the third pattern cooperating with the first and second patterns, respectively, to form second and third false proof identification marks;

a transparent thin film layer 11, the transparent thin film layer 11 covering the first, second and third regions emitting a third color light under 375nm ultraviolet irradiation, the transparent thin film layer 11 being formed by melt blowing an excitation powder consisting of 77-80 parts by weight of NH, a silane coupling agent and a polyester terephthalate₄H₂PO₄2-3 parts by weight of lithium carbonate, 12-14 parts by weight of sodium carbonate, 8-10 parts by weight of potassium carbonate, 3-4 parts by weight of europium trioxide and 1-2 parts by weight of cerium trioxide are melted and then crushed to form the powder,

a micro-lens unit array 12, the micro-lens unit array 12 arranged on the lower surface corresponding to the first area position comprises a plurality of spherical micro-lens units which are uniformly distributed at intervals, the micro-lens unit array 12 is used for observing the micro-structure layer 2 to form a three-dimensional pattern,

a magnetic code array 13, the magnetic code array 13 arranged on the lower surface corresponding to the second area and/or the third area comprises a plurality of magnetic codes 14 arranged in a predetermined sequence, fig. 2 is a schematic cross-sectional view of the magnetic code array of the security element according to one embodiment of the security element of the present invention, as shown in fig. 2, the cross-section of each magnetic code 14 comprises a bevel edge inclined along the arrangement direction, the inclination angle of the bevel edge is 40-50 degrees, and the thickness of the magnetic code gradually increases along the side close to the bevel edge.

In the present invention, the transparent carrier layer 1 has a transmission of more than 90% in the visible wavelength range of the human eye. The transparent bearing layer 1 provides a bearing body of the anti-counterfeiting device, and the transparent bearing layer 1 can transmit visible light or invisible light, so that the anti-counterfeiting is performed through the actions of layer reflection, diffraction, refraction and the like on the upper surface and the lower surface. The microstructured layer 2 of the present invention forms a first pattern in the first region 3, which provides a first security feature, and the microstructured layer 2 has a reflectivity of less than 7% in a first spectral range and a reflectivity of more than 70% in a second spectral range, which improves the identifiability and the anti-counterfeiting of the first pattern. The formation of the second pattern by the inventive triboreversible color-changing layer 7 in the second region 8 provides a second security feature, said triboreversible color-changing layer 7 develops a predetermined time after rubbing, which significantly improves the forgery-proof property of the second pattern, further, said second pattern and the first pattern cooperate with each other to form a first forgery-proof identification mark, which provides a composite third security feature, the formation of the third pattern by the inventive 3D printing layer 9 in the third region 10 provides a fourth security feature, said 3D printing layer 9 comprises emitting a first color light under the joint irradiation of 375nm ultraviolet light and 850nm infrared light, said 3D printing layer 9 emits a second color light different from the first color light under the irradiation of 375nm ultraviolet light, which significantly improves the forgery-proof property and the identifiability of the fourth security feature, said third pattern cooperates with the first pattern and the second pattern, respectively, to form a second and a third forgery-proof identification mark, this provides a composite fifth and sixth security feature, the transparent film layer 11 of the present invention emits a third colour light under 375nm uv illumination, further improving legibility and security, viewing the microstructured layer 2 through the microlens cell array 12 to form a three-dimensional pattern, which provides a seventh security feature, a plurality of magnetic codes 14 arranged in a predetermined order, each of the magnetic codes 14 having a cross-section including a hypotenuse inclined in the arrangement direction at an angle of 40-50 degrees, the thickness of the magnetic code increases progressively closer to the beveled side, and the array of magnetic codes forms a unique security device, which provides an eighth security feature, the thickness of the bevel edge of the magnetic code and the inclination angle of the bevel edge are controlled to enable the detected waveform to have unique anti-counterfeiting performance, so that the anti-counterfeiting performance is obviously improved.

In a preferred embodiment of the security element according to the invention, the transparent carrier layer 1 consists of polymethyl methacrylate as a flexible transparent layer with a thickness of 30 to 35 μm. In one embodiment, the transparent carrier layer 1 may have, for example, one or more of the following elements as further security devices: watermarks, security prints, security threads, patches with one or more security features that function as, for example, holographic or diffractive optical structures.

In a preferred embodiment of the security element according to the present invention, the metal layer 4 is a chromium metal layer and has a thickness of 50nm to 60 nm, the dielectric layer 5 is a polyvinyl chloride layer and has a thickness of 10 nm to 20 nm, and the metal thin film layer 6 is an aluminum metal thin film layer and has a thickness of 8 nm to 12 nm. In one embodiment, the micro-structured layer 2 is capable of providing a dynamic pattern with polarization selectivity.

In a preferred embodiment of the security element according to the present invention, the reversible thermochromic microcapsules are formed via in situ polymerization, have a particle size of 1.5-2 microns and when the reversible color changing layer 7 is rubbed, develop a color from a first color to a second color and recover the first color after a predetermined time. In one embodiment, the reversible color changing layer 2 is rubbed without rubbing to form a second pattern of blue, which changes to a second pattern of green after rubbing for 20-30 seconds, and the second pattern of green reverts to the second pattern of blue.

In a preferred embodiment of the security element according to the invention, the reversible thermochromic particles comprise 5-10 parts by weight of 1, 2-benzo-6-N-ethyl-N-isopentylamino-fluoran, 15-30 parts by weight of N-octyl paraben, 60-80 parts by weight of N-tridecyl stearate and 20-30 parts by weight of pigment agent.

In the preferred embodiment of the security element, the rare earth dopant is obtained by fully grinding and mixing germanium oxide, magnesium oxide, yttrium oxide, silicon oxide and gallium oxide, adding an activator containing chromium oxide, and reacting at 1300-1320 ℃ for 10 hours.

In a preferred embodiment of the security element according to the present invention, the transparent thin film layer 11 is formed by melt blowing 10 to 12 parts by weight of an excitation powder having a particle size of 150-200 nm, 0.5 to 0.8 part by weight of a silane coupling agent, and 87 to 90 parts by weight of a polyester terephthalate.

In a preferred embodiment of the security element according to the invention, the infrared detection layer, which is provided on the lower surface in a position different from the position of the magnetically encoded array 13 corresponding to the second and/or third area, comprises a layer containing a compound selected from the group consisting ofCaCuSi₄O₁₀A crystal phase of a luminescent material which emits infrared light under irradiation of natural light.

In a preferred embodiment of the security element according to the invention, the second pattern is a number symbol in a first arrangement, the first pattern is a number symbol in a second arrangement, the first pattern and the second pattern cooperate with each other to form a complete number sequence, in another embodiment the first pattern is a part of an image of an animal, the second pattern is another part of an image of an animal, and the first pattern and the second pattern cooperate with each other to form a first anti-counterfeiting identification of the complete image of the animal. Likewise, the third pattern may also be a numerical symbol, an animal image, or other image that cooperates with the first and second patterns, respectively, to form the second and third tamper-evident indicia.

In a preferred embodiment of the security element according to the invention, the 3D printed layer 9 comprises a layer emitting blue light under combined irradiation of 375nm ultraviolet light and 850nm infrared light, the 3D printed layer 9 emitting violet light under single irradiation of 375nm ultraviolet light, and the transparent film layer 11 emitting red light under irradiation of 375nm ultraviolet light.

In a preferred embodiment of the security element according to the invention, the first, second and/or third regions are of the same size, and in one embodiment are spaced apart.

Fig. 3 is a schematic representation of the steps of the method of manufacturing a security element according to the invention, one of said methods of manufacturing a security element comprising the steps of:

a first step S1, providing a transparent carrier layer 1 having an upper surface and a lower surface, evaporating a metal layer 4 in a first area 3 of the upper surface, embossing the metal layer 4 to form a plurality of concave-convex microstructures, and evaporating a metal thin film layer 6 after a dielectric layer 5 is vapor deposited on the metal layer 4 to form a microstructure layer 2, wherein the microstructure layer 2 forms a first pattern in the first area;

a second step S2 of gravure printing a frictional reversible color changing layer 7 on the second region 8 on the upper surface, the frictional reversible color changing layer 7 including reversible thermochromic microcapsules developing a color for a predetermined time after friction, the reversible thermochromic microcapsules being formed via an in-situ polymerization method, wherein the frictional reversible color changing layer forms a second pattern in the second region 8, the second pattern and the first pattern cooperating with each other to form a first forgery-proof identification mark;

a third step S3 of printing a 3D printed layer 9 on a third area 103D on the upper surface, wherein the 3D printed layer 9 forms a third pattern in the third area 10, the third pattern cooperating with the first pattern and the second pattern, respectively, to form second and third false proof identification marks;

a fourth step S4 of covering the transparent thin film layer 11 on the first, second and third areas, the transparent thin film layer 11 being formed by melt blowing an excitation powder consisting of 77-80 parts by weight of NH, a silane coupling agent and a polyester terephthalate₄H₂PO₄2-3 parts by weight of lithium carbonate, 12-14 parts by weight of sodium carbonate, 8-10 parts by weight of potassium carbonate, 3-4 parts by weight of europium trioxide and 1-2 parts by weight of cerium trioxide are melted and then crushed to form the powder,

a fifth step S5 of arranging a microlens cell array 12 at a position corresponding to the first region 3 on the lower surface, forming a three-dimensional pattern by observing the microstructure layer 2 through the microlens cell array 12,

a sixth step S6 of arranging a magnetic code array 13 on the lower surface at a position corresponding to the second region 8 and/or the third region 10, arranging a plurality of magnetic codes 14 in a predetermined order, each of the magnetic codes 14 having a cross section including a slanted side slanted in the arrangement direction at an angle of 40 to 50 degrees, the magnetic codes 14 having a thickness gradually increasing toward a side of the slanted side.

A security document comprising said security element. The security document may be, for example, a banknote, a check, a visa, a passport, an identification card or the like, provided with an anti-counterfeiting device, preferably the security document is a banknote, a polymer banknote, a mixed paper, a polymer banknote, an identity document, a passport, an identification card, a check, a visa, a certificate or a stamp. The security ticket of the present invention can also be combined with other anti-counterfeiting technologies such as watermarks, etc. for anti-counterfeiting, which are not described in detail.

Industrial applicability

The security element of the invention can be manufactured and used in the field of anti-counterfeiting preparation.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.

Claims

1. A security element, characterized in that it comprises:

a transparent carrier layer (1) comprising an upper surface and a lower surface,

the microstructure layer (2) is arranged on the upper surface, a first pattern is formed on the microstructure layer (2) in a first area (3), the microstructure layer (2) comprises a metal layer (4) with a plurality of concave-convex microstructures uniformly distributed on the outer surface, a dielectric layer (5) and a metal film layer (6), the outline shape and/or the peak-valley depth of the concave-convex microstructures enable the microstructure layer (2) to have a reflectivity lower than 7% in a first spectral range and a reflectivity higher than 70% in a second spectral range, and the microstructure layer (2) has a polarization selective dynamic pattern,

a tribologically reversible color change layer (7) gravure-printed on the upper surface, the tribologically reversible color change layer (7) forming a second pattern in a second area (8) arranged at a distance from the first area (3), the tribologically reversible color change layer (7) comprising reversible thermochromic microcapsules which develop color for a predetermined time after rubbing, the reversible thermochromic particles in the reversible thermochromic microcapsules comprising 1, 2-benzo-6- (N-ethyl-N-isopentylamino) fluoran, N-octyl paraben, N-tridecyl stearate and a pigment agent, the second pattern and the first pattern cooperating with each other to form a first anti-counterfeiting identification mark, the second pattern being a number symbol in a first arrangement, the first pattern being a number symbol in a second arrangement, the first pattern and the second pattern cooperating with each other to form a complete number sequence,

a 3D printed layer (9), the 3D printed layer (9) formed by 3D printing on the upper surface forming a third pattern in a third area (10) arranged at a distance from the first area (3) and the second area (8), the 3D printed layer (9) comprising a 3D printed material emitting a first color light under co-irradiation of 375nm ultraviolet light and 850nm infrared light, the 3D printed layer (9) emitting a second color light under separate irradiation of 375nm ultraviolet light, the 3D printed material comprising rare earth dopants, comprising the following: ge4+₂Mg2+₂Yb3+₂Si4+₃Ga3+₆O₂₃: 0.4Yb3+, 0.4Cr 3+, the third pattern cooperating with the first and second patterns, respectively, to form second and third false proof identification marks, the first, second and/or third regions being of the same size;

a transparent thin film layer (11), the transparent thin film layer (11) covering the first, second and third regions emitting a third color light under 375nm ultraviolet irradiation, the transparent thin film layer (11) being formed by melt blowing an excitation powder consisting of 77-80 parts by weight of NH, a silane coupling agent and a polyester terephthalate₄H₂PO₄2-3 parts by weight of lithium carbonate, 12-14 parts by weight of sodium carbonate, 8-10 parts by weight of potassium carbonate, 3-4 parts by weight of europium trioxide and 1-2 parts by weight of cerium trioxide are melted and then crushed to form the powder,

a microlens unit array (12), the microlens unit array (12) arranged on the lower surface corresponding to the first area position comprises a plurality of spherical microlens units which are uniformly distributed at intervals, the microstructure layer (2) is observed through the microlens unit array (12) to form a three-dimensional pattern,

and the magnetic coding array (13) is arranged at the position of the lower surface corresponding to the second area and/or the third area and comprises a plurality of magnetic codes (14) which are arranged in a preset sequence, the cross section of each magnetic code (14) comprises a bevel edge which is inclined along the arrangement direction, the inclination angle of the bevel edge is 40-50 degrees, and the thickness of the magnetic code is gradually increased along the side close to the bevel edge.

2. The security element of claim 1, wherein: the transparent bearing layer (1) is a flexible transparent layer with the thickness of 30-35 microns and is made of polymethyl methacrylate.

3. The security element of claim 1, wherein: the metal layer (4) is a chromium metal layer and has a thickness of 50-60 nanometers, the dielectric layer (5) is a polyvinyl chloride layer and has a thickness of 10-20 nanometers, and the metal thin film layer (6) is an aluminum metal thin film layer and has a thickness of 8-12 nanometers.

4. The security element of claim 1, wherein: the reversible thermochromic microcapsules are formed through an in-situ polymerization method, the particle size of the reversible thermochromic microcapsules is 1.5-2 microns, and when the reversible color changing layer (7) is rubbed, the reversible thermochromic microcapsules develop a second color from a first color and recover to the first color after a predetermined time.

5. The security element of claim 1, wherein: the reversible thermochromic particles comprise 5-10 parts by weight of 1, 2-benzo-6- (N-ethyl-N-isoamylamino) fluorane, 15-30 parts by weight of N-octyl p-hydroxybenzoate, 60-80 parts by weight of N-tridecyl stearate and 20-30 parts by weight of pigment agent.

6. The security element of claim 1, wherein: the rare earth dopant is obtained by fully grinding and mixing germanium oxide, magnesium oxide, yttrium oxide, silicon oxide and gallium oxide, adding an activator containing chromium oxide, and reacting at 1300-1320 ℃ for 10 hours.

7. The security element of claim 1, wherein: the transparent film layer (11) is formed by melting and blowing 10-12 parts by weight of excitation powder with the particle size of 150-200 nm, 0.5-0.8 part by weight of silane coupling agent and 87-90 parts by weight of polyester terephthalate.

8. The security element of claim 1, wherein: the infrared detection layer is arranged on the lower surface corresponding to the second area and/or the third area and at a position different from the position of the magnetic coding array (13) and comprises a magnetic material containing CaCuSi₄O₁₀A crystalline phase of a luminescent material that emits infrared light under irradiation of natural light.

9. The security element of claim 1, wherein: the transparent carrier layer (1) has a watermark or security thread.

10. The security element of claim 1, wherein: the second and third false proof identification marks formed by the third pattern respectively matching with the first pattern and the second pattern are digital symbols.