Anti-counterfeiting element, preparation method and anti-counterfeiting product

Abstract

The invention relates to the technical field of optical anti-counterfeiting, and discloses an anti-counterfeiting element, a preparation method and an anti-counterfeiting product.The anti-counterfeiting element comprises a base material, a forming layer, at least one microstructure, at least one second microstructure and a transparent protective layer, the forming layer is located on the surface of one side of the base material, each first microstructure has an initial visual effect, and each second microstructure has an initial visual effect; each first microstructure comprises a first microcavity and at least one first magnetic pigment structure, the first microcavities are arranged in the forming layer, and the first magnetic pigment structures are located in the first microcavities; each second microstructure has a first visual effect, the first visual effect is different from the initial visual effect, and each second microstructure is arranged in the forming layer. Through the first microstructures and the second microstructures, the anti-counterfeiting element can generate different visual effects without the action of an external magnetic field.

Description

Technical Field

[0001] The present invention relates to the field of optical anti-counterfeiting technology, and particularly relates to an anti-counterfeiting element, a preparation method thereof, and an anti-counterfeiting product. Background Art

[0002] In high-security or high-value-added products such as banknotes, stocks, stamps, checks, air tickets, credit cards, passports, etc., anti-counterfeiting elements are generally configured. These anti-counterfeiting elements can ensure the authenticity of information carriers and can also be used to prevent illegal copying.

[0003] In the related art, an anti-counterfeiting element is disclosed. The anti-counterfeiting element has a microcavity filled with a liquid in which magnetic pigment flakes are mixed. When an external magnetic field acts on the anti-counterfeiting element, the magnetic pigment flakes in the microcavity will change their positions and angles to produce a specific visual effect. In addition, by regulating the external magnetic field, the positions and angles of the magnetic pigments can be adjusted to obtain different visual effects.

[0004] However, for the above anti-counterfeiting element, an external magnetic field needs to be introduced to produce a specific visual effect. When there is no external magnetic field acting on the anti-counterfeiting element, the display effect of the anti-counterfeiting element is single and not easy for the public to identify. Summary of the Invention

[0005] In view of this, the present invention provides an anti-counterfeiting element, a preparation method thereof, and an anti-counterfeiting product to solve the problem that when there is no external magnetic field acting on the anti-counterfeiting element, the display effect of the anti-counterfeiting element is single and not easy for the public to identify.

[0006] In a first aspect, the present invention provides an anti-counterfeiting element, comprising:

[0007] A substrate;

[0008] A forming layer located on one side surface of the substrate;

[0009] At least one first microstructure, which includes a first microcavity and at least one magnetic pigment structure. The first microcavity is arranged in the forming layer, and the magnetic pigment structure is located in the first microcavity;

[0010] At least one second microstructure arranged in the forming layer, and the second microstructure has a first visual effect;

[0011] A transparent protective layer located on the side surface of the forming layer facing away from the substrate.

[0012] Beneficial effect: When there is no external magnetic field acting on the anti-counterfeiting element, the first microstructure has the visual effect of the initial state, and the second microstructure has the first visual effect. The visual effect of the initial state is in sharp contrast with the first visual effect of the second microstructure, which is conducive to being recognized by the public. When the external magnetic field acts on the anti-counterfeiting element, the magnetic pigment structure in the first microcavity changes its position and angle under the action of the external magnetic field, so that the visual effect of the magnetic pigment structure changes, and the change in visual effect is easy for the public to recognize. In addition, a reverse magnetic field can be applied to reset the magnetic pigment structure in the microcavity so that the observed visual effect is restored to the initial state. The visual effect of the anti-counterfeiting element can be changed by the external magnetic field, which increases the interactive anti-counterfeiting effect and improves the anti-counterfeiting ability. In addition, the magnetic pigment structure is set in the first microcavity, which can protect the magnetic pigment structure and avoid the influence of external temperature and physical friction on the magnetic pigment structure, thereby avoiding unexpected changes in the visual effect of the magnetic pigment structure, so as to ensure that the optical anti-counterfeiting element can produce stable changes in visual effects, and the microcavity can also avoid the shedding and loss of the magnetic pigment structure. By means of the first microstructure and the second microstructure, the anti-counterfeiting element can produce different visual effects when there is no external magnetic field, thereby increasing the complexity of the visual effects of the anti-counterfeiting element and thus improving the anti-counterfeiting capability.

[0013] In an optional embodiment, the orthographic projections of the first microstructure and the second microstructure on the substrate do not intersect each other;

[0014] Or the second microstructure is located on a side of the first microstructure facing away from the substrate, and the orthographic projections of the second microstructure and the first microstructure on the substrate at least partially overlap.

[0015] The relative position relationship between the first microstructure and the second microstructure can be flexibly adjusted so that the size of the anti-counterfeiting element can be adapted to various occasions. The second microstructure can also partially cover the first microstructure to cover the visual effect produced by the first microstructure, that is, the second microstructure can be directly formed on the first microstructure, thereby reducing changes to processing equipment and further reducing costs.

[0016] In an optional embodiment, the formation layer includes:

[0017] A first sub-forming layer is located between the substrate and the transparent protective layer, the first microcavity comprises a first groove; the first groove is arranged on the first sub-forming layer;

[0018] The second microstructure is located on a surface of the first sub-forming layer facing away from the substrate, and the second microstructure is spaced apart from the first groove;

[0019] The sealing layer is located between the first sub-forming layer and the transparent protective layer. The sealing layer and the first groove enclose to form the first microcavity, and the sealing layer covers the second micro-structure.

[0020] In an alternative embodiment, the forming layer includes:

[0021] The first sub-forming layer is located between the substrate and the transparent protective layer. The first microcavity includes a first groove; the first groove is provided on the first sub-forming layer;

[0022] The sealing layer is located between the first sub-forming layer and the transparent protective layer. The sealing layer and the first groove enclose to form the first microcavity.

[0023] The second sub-forming layer is located between the sealing layer and the transparent protective layer. The second micro-structure is located on the surface of the second sub-forming layer facing away from the transparent protective layer.

[0024] In an alternative embodiment, it further includes a reflective layer located in the forming layer, and the reflective layer coincides with the orthographic projection of the second micro-structure on the substrate.

[0025] In an alternative embodiment, it further includes a hollow structure. The hollow structure is spliced with the second micro-structure, and the orthographic projection of the hollow structure and the first micro-structure on the substrate at least partially overlaps;

[0026] The ratio of the depth to the width of each hollow unit in the hollow structure is greater than a first preset value, or the ratio of the half height-width of each hollow unit in the hollow structure to its volume is greater than a second preset value.

[0027] In an alternative embodiment, the second micro-structure includes one or more of a grating structure, magnetic optical variable ink, a microlens array, a Fresnel lens, a micro-relief structure, a thin-film interference structure, and a polarization optical variable structure.

[0028] The second micro-structure can adopt different optical variable structures so that the anti-counterfeiting element produces different visual effects, thereby enhancing the anti-counterfeiting ability.

[0029] In an alternative embodiment, the first micro-structure further includes a fluid medium. The fluid medium is filled in the first microcavity, and the magnetic pigment structure includes a Fabry-Perot resonant cavity structure.

[0030] Filling the microcavity with a fluid medium can play a lubricating role, reduce the friction between the magnetic pigment structure and the inner wall of the microcavity, so as to ensure that the magnetic pigment structure can move and rotate smoothly. In addition, the fluid can also provide a damping effect, which helps to stabilize the movement of the magnetic pigment structure. In addition, the fluid medium can further protect the magnetic pigment structure and reduce the impact of the external environment on the magnetic pigment structure. The magnetic pigment structure includes a Fabry-Perot resonant cavity structure, so that the magnetic pigment structure will present different visual effects under different observation angles.

[0031] In a second aspect, the present invention provides a method for preparing an anti-counterfeiting element, comprising:

[0032] Providing a substrate;

[0033] forming a cambium layer on one surface of the substrate;

[0034] forming at least one first microstructure within the microstructure formation;

[0035] The step of forming the first microstructure includes: forming a first microcavity in the microstructure, providing a magnetic pigment structure, and placing the magnetic pigment structure in the first microcavity;

[0036] forming at least one second microstructure within the microstructure formation, the second microstructure having a first visual effect;

[0037] A transparent protective layer is formed on the surface of the microstructure which is away from the substrate.

[0038] Beneficial effects: The preparation method of the anti-counterfeiting element is simple and easy to implement. In addition, when there is no external magnetic field acting on the anti-counterfeiting element, the first microstructure has the visual effect of the initial state, and the second microstructure has the first visual effect. The visual effect of the initial state forms a sharp contrast with the first visual effect of the second microstructure, which is conducive to being recognized by the public. In addition, when the external magnetic field acts on the anti-counterfeiting element, the magnetic pigment structure in the first microcavity changes its position and angle under the action of the external magnetic field, so that the visual effect of the magnetic pigment structure changes. The change in visual effect is easy for the public to recognize. The anti-counterfeiting element can reversibly regulate the position and angle of the magnetic pigment structure through the magnetic field, thereby obtaining a changeable visual effect, which forms a unique advantage of the public's interaction with the anti-counterfeiting element. In addition, different visual effects can be obtained by regulating the magnetic field, and the observer can perform anti-counterfeiting identification without changing the observation angle, thereby improving the naked eye recognizability of the anti-counterfeiting element.

[0039] In a third aspect, the present invention provides an anti-counterfeiting product, comprising the anti-counterfeiting element described above.

[0040] Beneficial effects: The visual effect of the anti-counterfeiting product can be changed by an external magnetic field. When an external magnetic field acts on the anti-counterfeiting element, the first microstructure has the visual effect of the initial state, and the second microstructure has the first visual effect. The visual effect of the initial state forms a sharp contrast with the first visual effect of the second microstructure, which is conducive to being recognized by the public, improves the anti-counterfeiting ability, meets the requirements of the high-end anti-counterfeiting field, and the anti-counterfeiting product has the advantages of high efficiency, stability, and batch production. Brief Description of the Drawings

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, and a second microstructure in the preparation of the first anti-counterfeiting element in the embodiment of the present invention;

[0043] Figure 2 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a second microstructure, and a reflective layer in the preparation of the first anti-counterfeiting element in the embodiment of the present invention;

[0044] Figure 3 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a second microstructure, a reflective layer, a fluid medium, and a magnetic pigment structure in the preparation of the first anti-counterfeiting element in the embodiment of the present invention;

[0045] Figure 4 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a second microstructure, a reflective layer, a fluid medium, a magnetic pigment structure, and a sealing layer in the preparation of the first anti-counterfeiting element in the embodiment of the present invention;

[0046] Figure 5 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a second microstructure, a reflective layer, a fluid medium, a magnetic pigment structure, a sealing layer, and a protective layer in the preparation of the first anti-counterfeiting element in the embodiment of the present invention;

[0047] Figure 6 It is a schematic structural diagram of a substrate, a first sub-forming layer, and a first groove in the preparation of the second anti-counterfeiting element in the embodiment of the present invention;

[0048] Figure 7 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a fluid medium, and a magnetic pigment structure in the preparation of the second anti-counterfeiting element in the embodiment of the present invention;

[0049] Figure 8 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a fluid medium, a magnetic pigment structure, and a sealing layer in the preparation of the second anti-counterfeiting element in an embodiment of the present invention;

[0050] Figure 9 It is a schematic structural diagram of a protective layer, a second sub-forming layer, a hollow structure, and a second microstructure in the preparation of the second anti-counterfeiting element in an embodiment of the present invention;

[0051] Figure 10 It is a schematic structural diagram of a protective layer, a second sub-forming layer, a hollow structure, a second microstructure, and a reflective layer in the preparation of the second anti-counterfeiting element in an embodiment of the present invention;

[0052] Figure 11 It is a schematic structural diagram of a protective layer, a second sub-forming layer, a hollow structure, a second microstructure, and the structure after removing the reflective layer on the surface of the hollow structure in the preparation of the second anti-counterfeiting element in an embodiment of the present invention;

[0053] Figure 12 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a fluid medium, a magnetic pigment structure, a sealing layer, a reflective layer, a hollow structure, a second microstructure, a second sub-forming layer, and a protective layer in the preparation of the second anti-counterfeiting element in an embodiment of the present invention;

[0054] Figure 13 It is a schematic structural diagram of a substrate, a first sub-forming layer, and a first groove in the preparation of the third anti-counterfeiting element in an embodiment of the present invention;

[0055] Figure 14 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a first fluid medium, and a first magnetic pigment structure in the preparation of the third anti-counterfeiting element in an embodiment of the present invention;

[0056] Figure 15 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a first fluid medium, a first magnetic pigment structure, and a first sealing layer in the preparation of the third anti-counterfeiting element in an embodiment of the present invention;

[0057] Figure 16 It is a schematic structural diagram of a protective layer, a second sub-forming layer, and a second groove in the preparation of the third anti-counterfeiting element in an embodiment of the present invention;

[0058] Figure 17 It is a schematic structural diagram of a protective layer, a second sub-forming layer, a second magnetic pigment structure, and a second fluid medium in the preparation of the third anti-counterfeiting element in an embodiment of the present invention;

[0059] Figure 18It is a schematic structural diagram of a protective layer, a second sub-forming layer, a second magnetic pigment structure, a second fluid medium, and a second sealing layer in the preparation of the third anti-counterfeiting element in an embodiment of the present invention;

[0060] Figure 19 It is a schematic structural diagram of a substrate, a first sub-forming layer, a first groove, a first fluid medium, a first magnetic pigment structure, a first sealing layer, a protective layer, a second sub-forming layer, a second magnetic pigment structure, a second fluid medium, and a second sealing layer in the preparation of the third anti-counterfeiting element in an embodiment of the present invention;

[0061] Figure 20 It is a schematic structural diagram of the fourth anti-counterfeiting element in an embodiment of the present invention;

[0062] Figure 21 It is a top view of an anti-counterfeiting product in an embodiment of the present invention;

[0063] Figure 22 It is a schematic structural diagram of the first anti-counterfeiting element or the second anti-counterfeiting element or the third anti-counterfeiting element under the action of a magnetic field in an embodiment of the present invention;

[0064] Figure 23 It is a schematic structural diagram of the third anti-counterfeiting element under the action of a magnetic field in an embodiment of the present invention;

[0065] Explanation of reference numerals:

[0066] 100, anti-counterfeiting element; 101, substrate; 102, forming layer; 1021, first sub-forming layer; 1022, first sealing layer; 1023, second sub-forming layer; 1024, third sub-forming layer; 1025, fourth sub-forming layer; 1026, second sealing layer; 103, first micro-structure; 1031, first groove; 1032, first fluid medium; 1033, first magnetic pigment structure; 104, second micro-structure; 1041, second groove; 1042, second fluid medium, 1043, second magnetic pigment structure; 105, transparent protective layer; 106, reflective layer; 107, hollow structure;

[0067] 200, substrate. Detailed implementation manners

[0068] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings. In the following description, the description of well-known structures and technologies is omitted to avoid unnecessarily confusing the concepts of the present invention. Various schematic structural diagrams according to embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, and for the purpose of clear expression, some details are enlarged, and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are only exemplary, and in practice, there may be deviations due to manufacturing tolerances or technical limitations. Those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs. In the context of the present invention, when a layer / component is referred to as being "on" another layer / component, the layer / component can be directly on the other layer / component, or there can be an intermediate layer / component between them. Additionally, if a layer / component is "on" another layer / component in one orientation, then when the orientation is reversed, the layer / component can be "under" the other layer / component.

[0069] For the anti-counterfeiting element 100 in the related art, an external magnetic field needs to be introduced to produce a specific visual effect. When there is no external magnetic field acting on the anti-counterfeiting element 100, the display effect of the anti-counterfeiting element 100 is single and not easy for the public to identify.

[0070] Therefore, an embodiment of the present invention provides an anti-counterfeiting element 100, through the first microstructure 103 and the second microstructure 104, so that when there is no external magnetic field acting on the anti-counterfeiting element 100, different visual effects can be generated, improving the complexity of the visual effect of the anti-counterfeiting element 100, thereby improving the anti-counterfeiting ability.

[0071] An anti-counterfeiting element 100 provided by an embodiment of the present invention, as Figure 5 , Figure 12 , Figure 19 , Figure 20 shown, includes a substrate 101, a forming layer 102, at least one microstructure, at least one second microstructure 104, and a transparent protective layer 105. The forming layer 102 is located on one side surface of the substrate 101. Each first microstructure 103 has an initial visual effect. Each first microstructure 103 includes a first microcavity and at least one first magnetic pigment structure 1033. The first microcavity is disposed in the forming layer 102, and the first magnetic pigment structure 1033 is located in the first microcavity. Each second microstructure 104 has a first visual effect, which is different from the initial visual effect. Each second microstructure 104 is disposed in the forming layer 102.

[0072] Specifically, the substrate 101 serves as the carrier for the formation layer 102, used to carry the formation layer 102. The material of the substrate 101 can be polyethylene terephthalate, polyvinyl chloride, paper, and other common anti-counterfeiting substrates 101. The substrate 101 can be opaque, that is, the transmittance of the substrate 101 is less than or equal to 25%. For the anti-counterfeiting element 100 using such a substrate 101, it needs to be observed from the side of the substrate 101 with the formation layer 102. Of course, the substrate 101 can also be transparent, that is, the transmittance of the substrate 101 is greater than or equal to 75%. For the anti-counterfeiting element 100 using such a substrate 101, it can be observed from both sides of the substrate 101, that is, the formation layer 102 can be observed through the substrate 101. The formation layer 102 is located on the light-receiving surface of the substrate 101, and the transmittance of the formation layer 102 is greater than or equal to 75%, which is convenient for the public to observe the initial visual effect and the first visual effect through the formation. In this embodiment, the number of the first microstructures 103 is not limited, and can be one or more. Each first microstructure 103 includes a first microcavity and at least one first magnetic pigment structure 1033. The first microcavity is arranged in the formation layer 102, and the first microcavity is used to accommodate the first magnetic pigment structure 1033. Since the first magnetic pigment structure 1033 needs to change its position and angle in the first microcavity, therefore, the maximum length of the first magnetic pigment structure 1033 is less than the length, width, and depth of the first microcavity. The shapes of the first microcavity and the first magnetic pigment structure 1033 are not limited in this embodiment, and those skilled in the art can adjust the shapes of the first microcavity and the first magnetic pigment structure 1033 according to needs. Preferably, in this embodiment, both the first microcavity and the first magnetic pigment structure 1033 are cuboids. The number of the first magnetic pigment structures 1033 is not limited in this embodiment, and can be one or more. Each magnetic pigment structure has a magnetic layer and a non-magnetic layer. The magnetic layer can be a magnetic oxide or a magnetic metal. The magnetic metal includes iron, cobalt, nickel, yttrium, or other magnetic metals. Of course, the magnetic metal also includes alloys with rare earth elements added. The magnetic oxide includes iron oxide, chromium oxide, chromite oxide, or other magnetic oxides. The non-magnetic layer can be silicon dioxide, magnesium fluoride, titanium dioxide, zinc oxide, aluminum, chromium, copper, organic materials, or other non-magnetic materials. The non-magnetic material or the magnetic material itself in the magnetic pigment structure has a specific color (visual effect), or the magnetic pigment structure contains pigments to form a specific color, so that the anti-counterfeiting element 100 also has a specific color that can be observed with the naked eye in the initial state. When observing the anti-counterfeiting element 100 or an object containing the optical anti-counterfeiting element 100, a specific color can be observed, and the color includes hue, brightness, and saturation.The second microstructure 104 is located within the formation layer 102. The second microstructure 104 includes one or more of a grating structure, magnetic optically variable ink, a microlens array, a Fresnel lens, a micro-relief structure, a thin-film interference structure, and a polarized light variable structure. The second microstructure 104 can produce a special first visual effect, which can be a change in brightness, a three-dimensional image, a dynamic image, or other common anti-counterfeiting visual effects. The first visual effect is different from the initial visual effect. The transparent protective layer 105 is located on the surface of the formation layer 102 facing away from the substrate 101. The transparent protective layer 105 can be an ultraviolet curable material or other materials. Preferably, the transparent protective layer 105 is an ultraviolet curable material, which is convenient for processing a set structure. The light transmittance of the transparent protective layer 105 is greater than or equal to 75%, so that the visual effect of the microstructure can be observed through the transparent protective layer 105.

[0073] For the anti-counterfeiting element 100 provided in this embodiment, when no external magnetic field acts on the anti-counterfeiting element 100, the first microstructure 103 has the visual effect in the initial state, and the second microstructure 104 has the first visual effect. The visual effect in the initial state forms a sharp contrast with the first visual effect of the second microstructure 104, which is conducive to being recognized by the public. When an external magnetic field acts on the anti-counterfeiting element 100, the first magnetic pigment structure 1033 in the first microcavity changes its position and angle under the action of the external magnetic field, so that the visual effect of the first magnetic pigment structure 1033 changes, and the change in the visual effect is easy for the public to recognize. In addition, a reverse magnetic field can be applied to reset the first magnetic pigment structure 1033 in the first microcavity, so that the observed visual effect is restored to the initial state. The visual effect of the anti-counterfeiting element 100 can be changed by an external magnetic field, increasing the interactive anti-counterfeiting effect and enhancing the anti-counterfeiting ability. In addition, by arranging the first magnetic pigment structure 1033 in the first microcavity, the first magnetic pigment structure 1033 can be protected from the influence of external temperature and physical friction, thereby avoiding unexpected changes in the visual effect of the first magnetic pigment structure 1033, so as to ensure that the optical anti-counterfeiting element 100 can produce a stable change in the visual effect. The first microcavity can also prevent the first magnetic pigment structure 1033 from falling off and being lost. Through the first microstructure 103 and the second microstructure 104, when there is no external magnetic field acting on the anti-counterfeiting element 100, different visual effects can be produced, improving the complexity of the visual effect of the anti-counterfeiting element 100, thereby enhancing the anti-counterfeiting ability.

[0074] In one embodiment, as Figure 5 、 Figure 12 、 Figure 19 、 Figure 20As shown, the forming layer 102 includes a first sub-forming layer 1021 and a sealing layer. The forming layer 102 can be an ultraviolet curable material or other materials. Preferably, the forming layer 102 is an ultraviolet curable material, and the ultraviolet curable material can be shaped by ultraviolet light irradiation, which is convenient for processing a set structure. Each first microcavity includes a first groove 1031, the first groove 1031 is formed on the first sub-forming layer, and the opening of the first groove 1031 is located on the surface of the first sub-forming layer 1021 facing away from the substrate 101. The inner wall of the first groove 1031 is covered with a reflective layer 106 for enhancing the visual effect generated by the first magnetic pigment structure 1033. The first sealing layer 1022 is located on the surface of the first sub-forming layer 1021 facing away from the substrate 101, and the first sealing layer 1022 and the first groove 1031 enclose a first microcavity. The protective layer is located on the surface of the first sealing layer 1022 facing away from the first sub-forming layer 1021. The first sealing layer 1022 is an adhesive, and the first sub-forming layer 1021 is used to connect the protective layer and the protective layer.

[0075] In one embodiment, as Figure 5 、 Figure 12 、 Figure 19 、 Figure 20As shown, each first microstructure 103 further includes a first fluid medium 1032. The first fluid medium 1032 fills the first microcavity. The first magnetic pigment structure 1033 is located within the first fluid medium 1032. The thickness of the first fluid medium 1032 is less than the depth of the first groove 1031, which is conducive to forming the first sealing layer 1022 on the first fluid medium 1032 and avoiding the overflow of the first fluid medium 1032 during the formation of the first sealing layer 1022. The first fluid medium 1032 can be a gas, a liquid, a gel, or other deformable materials, so that the first magnetic pigment structure 1033 can move and rotate within the first fluid medium 1032. The material selection of the first fluid medium 1032 does not affect the visual effect and magnetic properties of the first magnetic pigment structure 1033. Filling the first microcavity with the first fluid medium 1032 can play a lubricating role, reducing the friction between the first magnetic pigment structure 1033 and the inner wall of the first microcavity to ensure that the first magnetic pigment structure 1033 can move and rotate smoothly. In addition, the first fluid can also provide a damping effect, helping to stabilize the movement of the first magnetic pigment structure 1033. Additionally, the first fluid medium 1032 can further protect the first magnetic pigment structure 1033, reducing the influence of the external environment on the first magnetic pigment structure 1033. The transmittance of the first fluid medium 1032 is greater than or equal to 75%, reducing the influence of the color of the first fluid medium 1032 itself on the visual effect expression of the first magnetic pigment structure 1033, so as to ensure that the public can clearly observe the visual effect of the first magnetic pigment structure 1033. In addition, the reflective layer 106 is located between the first fluid medium 1032 and the inner wall of the first groove 1031, used to separate the first fluid medium 1032 from the inner wall of the first groove 1031 and avoid the erosion of the inner wall of the first groove 1031 by the first fluid medium 1032.

[0076] In one embodiment, as Figure 5 , Figure 12 , Figure 19 , Figure 20 shown, the first fluid medium 1032 is a non-polar material. For example, the material of the first fluid medium 1032 can be carbon tetrachloride, glycerol. The intermolecular force is commonly present in non-polar materials, and the intermolecular force is weaker than the binding force of hydrogen bonds and ionic bonds. Therefore, using a non-polar material can reduce the surface tension of the first fluid medium 1032, thereby reducing the degree of concave or convex on the surface of the first fluid medium 1032, which is conducive to better filling the first microcavity and thus conducive to the subsequent preparation of the first sealing layer 1022. The density of the first sealing layer 1022 is less than the density of the first fluid medium 1032, ensuring that the first sealing layer 1022 floats on the surface of the first fluid medium 1032.

[0077] In one embodiment, as Figure 5 , Figure 12 ,Figure 19 , Figure 20 As shown, the first magnetic pigment structure 1033 is a Fabry-Perot resonant cavity structure, that is, the first magnetic pigment structure 1033 is composed of metal / medium / metal stacking, or medium / metal / medium stacking, wherein the medium can be silicon dioxide or other dielectric materials. Preferably, in this embodiment, the first magnetic pigment structure 1033 uses nickel / silicon dioxide / aluminum / iron / aluminum / silicon dioxide / nickel. The nickel / silicon dioxide / aluminum and aluminum / silicon dioxide / nickel symmetrically distributed on both sides form a "Fabry-Perot" structure. The first magnetic pigment structure 1033 appears golden when observed from the metal nickel side. The iron in the middle is a magnetic layer, which can move and rotate under the action of a magnetic field. The nickel on both sides can also provide a certain degree of magnetism, thereby enhancing the ability of the magnetic pigment structure to move and rotate, thereby improving the interactive anti-counterfeiting effect of the anti-counterfeiting element 100. In addition, the first magnetic pigment structure 1033 also has a surface relief structure, such as a holographic diffraction structure and a submicron scale structure, which can add a specific visual effect to the first magnetic pigment structure 1033 to increase the complexity of the visual effect, thereby improving the anti-counterfeiting ability of the anti-counterfeiting element 100.

[0078] In one embodiment, the angle between the inner sidewall of the first groove 1031 and the surface of the first sub-forming layer 1021 facing away from the substrate 101 is A, wherein 90°<A<189°. That is, the angle between the inner sidewall of the first groove 1031 and the upper surface of the first sub-forming layer 1021 is between 90° and 180°. Obviously, the inner sidewall of the first groove 1031 is inclined, which facilitates the preparation of the reflective layer 106 on the inner sidewall of the first groove 1031 and facilitates the smooth filling of the first fluid medium 1032 into the first groove 1031.

[0079] In one embodiment, Figure 5 As shown, it also includes a second sub-forming layer 1023 and a reflective layer 106. The surface of the first sub-forming layer 1021 has a magnetic region and a non-magnetic region. The magnetic region is connected to the non-magnetic region. A plurality of first microstructures 103 are distributed in the magnetic region, and the non-magnetic region has a second microstructure 104. Figure 5Taking the perspective of [description missing] as an example, a plurality of first microstructures 103 are distributed at intervals along the length direction of the anti-counterfeiting element 100, and the region where the plurality of first microstructures 103 are located is the magnetic region. The second microstructure 104 is a blazed grating, and the constituent structure of the blazed grating has been disclosed in the related art and will not be elaborated here. The second microstructure 104 is formed on the surface of the first sub-forming layer 1021 facing away from the substrate 101, and the second microstructure 104 extends along the length direction of the anti-counterfeiting element 100. The region where the second microstructure 104 is located is the non-magnetic region. In addition, the second microstructure 104 is spliced with the last first microstructure 103, and the orthographic projections of the first microstructure 103 and the second microstructure 104 on the substrate 101 are complementary and cross each other, that is, the first microstructure 103 and the second microstructure 104 do not block each other, and the display effects of all the first microstructures 103 and all the second microstructures 104 can be observed during observation. The reflective layer 106 is aluminum, and the reflective layer 106 is located on the surface of the second microstructure 104 facing away from the substrate 101. The reflective layer 106 is used to enhance light reflection, thereby improving the display effect of the second microstructure 104, and the reflective layer 106 and the second microstructure 104 together constitute the visual effect of a relief. Of course, the reflective layer 106 can also be covered on the inner wall of the first groove 1031 to enhance the display effect of the magnetic pigment structure. In addition, the reflective layer 106 can also be provided on the surface of the first sub-forming layer 1021 except for the first groove 1031 and the second microstructure 104 to improve the brightness of the anti-counterfeiting element 100. The first sealing layer 1022 is located between the reflective layer 106 and the protective layer, and the first sealing layer 1022 and the first groove 1031 enclose a first microcavity. The material of the first sealing layer 1022 can be an adhesive. The forming layer 102 further includes a second sub-forming layer 1023. The second sub-forming layer 1023 is located on the surface of the first sealing layer 1022 facing away from the substrate 101, and the protective layer is located on the surface of the second sub-forming layer 1023 facing away from the first sealing layer 1022. The top surface of the protective layer is the light-receiving surface.

[0080] In an alternative embodiment, as Figure 20As shown, it further includes a reflective layer 106 and a second sub-forming layer 1023. A plurality of first microstructures 103 are spaced apart along the length direction of the anti-counterfeiting element 100. The second sub-forming layer 1023 is made of the same material as the first sub-forming layer. The second sub-forming layer 1023 is located between the first sealing layer 1022 and the protective layer. The second microstructure 104 is a blazed grating. The blazed grating is used to produce a gradient visual effect. The composition structure of the blazed grating has been disclosed in the related art and will not be elaborated here. The second microstructure 104 is formed on the surface of the second sub-forming layer 1023 facing away from the protective layer. The reflective layer 106 is located on the surface of the second microstructure 104 facing away from the protective layer. The reflective layer 106 covers the second microstructure 104. The reflective layer 106 is used to reflect light and form a relief visual effect with the second microstructure 104. The second microstructure 104 extends along the length direction of the anti-counterfeiting element 100. Since the second microstructure 104 is located above the first microstructure 103, the second microstructure 104 will block the first microstructure 103 directly below it, so that the visual effect of the blocked first microstructure 103 cannot be observed. Thus, only the visual effect of the second microstructure 104 can be observed in the area where the second microstructure 104 is located, while in the area not blocked by the second microstructure 104, the visual effect of the first microstructure 103 can be observed.

[0081] In an alternative embodiment, as Figure 12As shown, it further includes a reflective layer 106, a hollow structure 107, and a second sub-forming layer 1023. A plurality of first microstructures 103 are spaced apart along the length direction of the anti-counterfeiting element 100. The second sub-forming layer 1023 is made of the same material as the first sub-forming layer. The second sub-forming layer 1023 is located between the first sealing layer 1022 and the protective layer. The second microstructure 104 is a blazed grating. The blazed grating is used to produce a gradient visual effect. The composition structure of the blazed grating has been disclosed in the related art and will not be elaborated here. The second microstructure 104 is formed on the surface of the second sub-forming layer 1023 facing away from the protective layer. The length of the blazed grating is 20 μm, and the thickness of the blazed grating is 2 μm. The blazed grating is composed of a plurality of inclined grooves spliced together. The reflective layer 106 is located on the surface of the second microstructure 104 facing away from the protective layer. The reflective layer 106 covers the second microstructure 104. The reflective layer 106 is used to reflect light and form a relief visual effect with the second microstructure 104. The composition structure of the hollow structure 107 has been disclosed in the related art and will not be elaborated here. The hollow structure 107 is formed on the surface of the second sub-forming layer 1023 facing away from the protective layer. The hollow structure 107 is a sine grating. The hollow structure 107 is composed of a plurality of arc-shaped grooves spliced together. The arc-shaped groove is the hollow unit. The width of each hollow unit is 3 μm, and the depth is 3 μm. The depth-to-width ratio of each hollow unit is 1, that is, the first preset value is 1. When forming the reflective layer 106, the thickness of the reflective layer 106 deposited on the hollow structure 107 with this depth-to-width ratio is much smaller than that of the hollow structure 107 with a small depth-to-width ratio. Therefore, when passing through the etching solution, the reflective layer 106 on the hollow structure 107 with this depth-to-width ratio is more easily removed by the etching solution, so that the reflective layer 106 on the hollow structure 107 can be accurately removed. In an alternative embodiment, the ratio of the half-height width of the hollow unit to its volume can also be greater than the second preset value. The second preset value is 1. When forming the reflective layer 106, by using the hollow structure 107, the thickness of the bottom of the hollow unit is greater than the thickness of the side of the hollow. Therefore, the reflective layer 106 on the hollow structure 107 can be accurately removed by the etching solution. By using such a hollow structure 107, the reflective layer 106 on the hollow structure 107 can be accurately removed, so that the hollow structure 107 and the reflective layer 106 are accurately spliced. The second microstructure 104 extends along the length direction of the anti-counterfeiting element 100. Since the second microstructure 104 is located above the first microstructure 103, the second microstructure 104 will block the first microstructure 103 directly below it, so that the visual effect of the blocked first microstructure 103 cannot be observed. Thus, only the visual effect of the second microstructure 104 can be observed in the area where the second microstructure 104 is located, while in the area not blocked by the second microstructure 104, the visual effect of the first microstructure 103 can be observed.The first sealing layer 1022 is located between the first sub-forming layer 1021 and the second sub-forming layer 1023, and the first sealing layer 1022 fills each hollow unit and each inclined groove. The first sealing layer 1022 uses an adhesive to bond the first sub-forming layer 1021 and the second sub-forming layer 1023 together. The difference between the refractive index of the second sub-forming layer 1023 and the refractive index of the first sealing layer 1022 is greater than 0.2, and the observer can observe the holographic visual effect produced by the hollow structure 107. In an alternative embodiment, the difference between the refractive index of the second sub-forming layer 1023 and the refractive index of the first sealing layer 1022 is less than 0.2. Since the refractive indices of the two are similar, the grating of the hollow structure 107 is optically equivalent to non-existent. Therefore, the observer can only observe the visual effect produced by the first micro-structure 103 directly below the hollow structure 107.

[0082] In an alternative embodiment, as Figure 19 shown, it further includes a second sub-forming layer 1023, a second sealing portion, a third sub-forming layer 1024, and a fourth sub-forming layer 1025. The second sub-forming layer 1023, the second sealing portion, the third sub-forming layer 1024, and the fourth sub-forming layer 1025 may have the same material or different materials. The third sub-forming layer 1024 is located on the surface of the first sealing layer 1022 facing away from the substrate 101, and the fourth sub-forming layer 1025 is located on the surface of the third sub-forming layer 1024 facing away from the first sealing layer 1022. The third sub-forming layer 1024 and the fourth sub-forming layer 1025 are connected by an adhesive. The second sub-forming layer 1023 is located on the surface of the fourth sub-forming layer 1025 facing away from the third sub-forming layer 1024. Each second micro-structure 104 includes a second groove 1041, a second magnetic pigment, and a second fluid medium 1042. The second groove 1041 is formed in the second sub-forming layer 1023, and the opening of the second groove 1041 is located on the surface of the second sub-forming layer 1023 facing away from the fourth sub-forming layer 1025. The second fluid medium 1042 and the second magnetic pigment structure 1043 are filled in the second groove 1041. The second sealing layer 1026 is located on the surface of the second sub-forming layer 1023 facing away from the fourth sub-forming layer 1025, and the second sealing layer 1026 and the second groove 1041 enclose a second micro-cavity. The second fluid medium 1042 is a polymeric prepolymer, a photosensitive monomer, a photoinitiator, or other ultraviolet-curable materials. Before the second fluid medium 1042 is cured, a specific magnetic field is applied to change the position and angle of the second magnetic pigment structure 1043 in the second fluid medium 1042, and then the second fluid is cured by ultraviolet light to keep the position and angle of the second magnetic pigment structure 1043 in the second fluid medium 1042, thereby producing a specific visual effect.

[0083] In a second aspect, the present invention provides a first method for preparing an anti-counterfeiting element 100, comprising the following steps:

[0084] S101, as Figure 1 shown, provide a substrate 101. The material of the substrate 101 can be polyethylene terephthalate, polyvinyl chloride, paper, and other common anti-counterfeiting substrates 101. The transmittance of the substrate 101 is less than or equal to 25%. A first sub-forming layer 1021 is formed on the upper surface of the substrate 101. The first sub-forming layer 1021 can be acrylate or other polar materials. The first sub-forming layer 1021 is initially in a liquid state, and the liquid material of the first sub-forming layer 1021 is spin-coated on the upper surface of the substrate 101; a first groove 1031 is fabricated on the forming layer 102 by a molding process. Then, a second microstructure 104 (here a blazed grating) can be prepared by a mechanical scribing process, a holographic ion beam etching process, or a lamination process.

[0085] S102, as Figure 2 shown, a reflective layer 106 is formed on the first sub-forming layer 1021 by a vapor deposition process. The reflective layer 106 is aluminum with a thickness of 40 nm. The reflective layer 106 covers the second microstructure 104 and covers the inner wall of the first groove 1031.

[0086] S103, as Figure 3 shown, a first fluid medium 1032 with a first magnetic pigment mechanism is filled in the first groove 1031 by a scraping method. Since the groove depth in the second microstructure 104 is too small, the second fluid medium 1042 remaining in the second microstructure 104 is less and does not affect the display effect of the second microstructure 104.

[0087] There are two paths to place the first magnetic pigment structure 1033 inside the first groove 1031. One is to fill the first magnetic pigment structure 1033 dispersed in the fluid medium into the first groove 1031, and then volatilize the fluid medium by drying. At this time, the fluid medium in the microcavity is air. The other is to fill the first magnetic pigment structure 1033 dispersed in the fluid medium into the first groove 1031 and retain the solution. At this time, the microcavity is composed of liquid or part liquid and part air.

[0088] S104, as Figure 4 shown, the material of the first sealing layer 1022 is spin-coated on the surface of the reflective layer 106 facing away from the first sub-formation. The first sealing layer 1022 and the first groove 1031 enclose a first microcavity.

[0089] S105, as Figure 5 shown, a transparent protective layer 105 is formed on the side of the first sealing layer 1022 facing away from the substrate 101.

[0090] Specifically, the transparent protective layer 105 is made of acrylate. The liquid transparent protective layer 105 is coated on the surface of the second isolation layer facing away from the microstructures by a coating device, and then the liquid transparent protective layer 105 is cured and shaped by ultraviolet light irradiation.

[0091] The present invention provides a third method for preparing the anti-counterfeiting element 100, which includes the following steps:

[0092] S201, as Figure 6 shown, provide a substrate 101. The material of the substrate 101 can be polyethylene terephthalate, polyvinyl chloride, paper, and other common anti-counterfeiting substrates 101. The transmittance of the substrate 101 is less than or equal to 25%. A first sub-forming layer 1021 is formed on the upper surface of the substrate 101. The first sub-forming layer 1021 can be acrylate or other polar materials. The first sub-forming layer 1021 is initially liquid, and the liquid first sub-forming layer 1021 material is spin-coated on the upper surface of the substrate 101; a first groove 1031 is made on the forming layer 102 by a molding process.

[0093] S202, as Figure 7 shown, the first fluid medium 1032 with a first magnetic pigment mechanism is filled in the first groove 1031 by a scraping method.

[0094] S203, as Figure 8 shown, the material of the first sealing layer 1022 is spin-coated on the surface of the reflective layer 106 facing away from the first sub-formation. The first sealing layer 1022 and the first groove 1031 enclose a first microcavity.

[0095] S204, as Figure 9 shown, provide a transparent protective layer 105. The material of the transparent protective layer 105 can be acrylate. The second sub-forming layer 1023 is initially liquid, and the liquid second sub-forming layer 1023 material is spin-coated on the upper surface of the transparent protective layer 105; a second microstructure 104 (blazed grating) and a hollow structure 107 are made on the forming layer 102 by a molding process.

[0096] S205, as Figure 10 shown, a reflective layer 106 is formed on the side of the second sub-forming layer 1023 facing away from the transparent protective layer 105 by a vapor deposition process. The reflective layer 106 covers the hollow structure 107 and the second mechanism.

[0097] S206, as Figure 11 shown, the reflective layer 106 on the surface of the hollow structure 107 is removed by an etching process.

[0098] S207, as Figure 12As shown, the first sealing layer 1022 is used to bond the first sub-forming layer 1021 and the second sub-forming layer 1023, and the first sealing layer 1022 fills the hollow structure 107 and the second microstructure 104.

[0099] The difference between the preparation method of the second anti-counterfeiting element 100 provided by the present invention and the preparation method of the third anti-counterfeiting element 100 is that there is no need to prepare the hollow structure 107, and the other steps are the same, so they will not be elaborated here.

[0100] The present invention provides a preparation method for the fourth anti-counterfeiting element 100, including the following steps:

[0101] S301, as Figure 13 shown, provide a substrate 101. The material of the substrate 101 can be polyethylene terephthalate, polyvinyl chloride, paper, and other common anti-counterfeiting substrates 101, and the transmittance of the substrate 101 is less than or equal to 25%. A first sub-forming layer 1021 is formed on the upper surface of the substrate 101. The first sub-forming layer 1021 can be acrylate or other polar materials. The first sub-forming layer 1021 is initially in a liquid state, and the liquid material of the first sub-forming layer 1021 is spin-coated on the upper surface of the substrate 101; a first groove 1031 is made on the forming layer 102 by a molding process.

[0102] S302, as Figure 14 shown, a first fluid medium 1032 with a first magnetic pigment mechanism is filled in the first groove 1031 by a scraping method.

[0103] S303, as Figure 15 shown, the material of the first sealing layer 1022 is spin-coated on the surface of the reflective layer 106 facing away from the first sub-forming layer. The first sealing layer 1022 and the first groove 1031 enclose a first microcavity. A third sub-forming layer 1024 is formed on the surface of the first sealing layer 1022 facing away from the substrate 101 by a spin-coating device. The material of the third sub-forming layer 1024 is acrylate.

[0104] S304, as Figure 16 shown, provide a fourth sub-forming layer 1025 cured by ultraviolet light. The second sub-forming layer 1023 is initially in a liquid state, and the liquid material of the second sub-forming layer 1023 is spin-coated on the upper surface of the fourth sub-forming layer 1025; a second groove 1041 is made on the second sub-forming layer 1023 by a molding process.

[0105] S305, as Figure 17 shown, a second fluid medium 1042 with a second magnetic pigment mechanism is filled in the first groove 1031 by a scraping method.

[0106] S306, as Figure 18As shown, the material of the second sealing layer 1026 is spin-coated on the surface of the second sub-forming layer 1023 facing away from the transparent protective layer 105. The second sealing layer 1026 and the second groove 1041 enclose to form a first microcavity. A transparent protective layer 105 is formed on the surface of the second sealing layer 1026 facing away from the transparent protective layer 105 through a spin-coating device. The material of the transparent protective layer 105 is acrylate.

[0107] S207, as Figure 12 shown, the fourth sub-forming layer 1025 and the third sub-forming layer 1024 are bonded together using an adhesive.

[0108] The method for preparing the anti-counterfeiting element 100 provided in this embodiment is simple and easy to implement. In addition, when there is no external magnetic field acting on the anti-counterfeiting element 100, the first micro-structure 103 has the visual effect in the initial state, and the second micro-structure 104 has the first visual effect. The visual effect in the initial state forms a sharp contrast with the first visual effect of the second micro-structure 104, which is conducive to being recognized by the public. Additionally, when an external magnetic field acts on the anti-counterfeiting element 100, the magnetic pigment structure in the first microcavity changes its position and angle under the action of the external magnetic field, so that the visual effect of the magnetic pigment structure changes. The change in the visual effect is easy for the public to recognize. The anti-counterfeiting element 100 reversibly regulates the position and angle of the magnetic pigment structure through the magnetic field, thereby obtaining a changeable visual effect. This forms a unique advantage for the interaction between the public and the anti-counterfeiting element 100. Additionally, different visual effects can be obtained by regulating the magnetic field, and the observer can perform anti-counterfeiting identification without changing the observation angle, thereby improving the naked-eye recognizability of the anti-counterfeiting element 100.

[0109] In a third aspect, the present invention provides an anti-counterfeiting product, as Figure 21 shown, including the above-mentioned anti-counterfeiting element 100 and a substrate 200. The substrate 200 can be one of banknotes, stocks, stamps, checks, tickets, various ticket labels, valuable documents, and various certificates. The anti-counterfeiting element 100 can be transferred to the carrier by pasting, hot stamping, or other transfer methods. When there is no external magnetic field, the optical anti-counterfeiting element 100 presents the initial visual effect of the magnetic pigment structure, and the second micro-structure 104 has the first visual effect.

[0110] As Figure 22 shown, the anti-counterfeiting product provided in this embodiment has one of the first anti-counterfeiting element 100, the second anti-counterfeiting element 100, and the third anti-counterfeiting element 100. When a magnet approaches the anti-counterfeiting product, the anti-counterfeiting element 100 produces the visual effect as shown.

[0111] As Figure 23As shown, the anti-counterfeiting product provided in this embodiment has a fourth anti-counterfeiting element 100. When a magnet approaches the anti-counterfeiting product, the anti-counterfeiting element 100 produces the visual effect as shown in the figure.

[0112] The anti-counterfeiting product provided in this embodiment has an optical effect that can be changed by an external magnetic field, thereby achieving an interactive anti-counterfeiting effect, enhancing the anti-counterfeiting ability, meeting the requirements of the high-end anti-counterfeiting field, and the anti-counterfeiting product has the advantages of high efficiency, stability, and batch production.

[0113] In the above description, technical details such as the composition and etching of each layer are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of the required shape. In addition, in order to form the same structure, those skilled in the art can also design methods that are not exactly the same as the methods described above. In addition, although the above embodiments are described separately, this does not mean that the measures in each embodiment cannot be used in combination advantageously.

[0114] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An anti-counterfeiting element, characterized in that: include: A substrate (101); forming a layer (102) located on one side surface of the substrate (101); at least one first microstructure (103) having an initial visual effect, the first microstructure (103) comprising a first microcavity and at least one first magnetic pigment structure (1033), the first microcavity being disposed in the formation layer (102), and the first magnetic pigment structure (1033) being located in the first microcavity; at least one second microstructure (104), the second microstructure (104) being disposed in the formation layer (102), the second microstructure (104) having a first visual effect, the first visual effect being different from the initial visual effect; The transparent protective layer (105) is located on the surface of the formation layer (102) which is away from the substrate (101).

2. The anti-counterfeiting element according to claim 1, characterized in that: The orthographic projections of the first microstructure (103) and the second microstructure (104) on the substrate (101) do not intersect each other; Or the second microstructure (104) is located on a side of the first microstructure (103) facing away from the substrate (101), and the orthographic projections of the second microstructure (104) and the first microstructure (103) on the substrate (101) at least partially overlap.

3. The anti-counterfeiting element according to claim 2, characterized in that: The formation layer (102) comprises: A first sub-forming layer (1021) is located between the substrate (101) and the transparent protective layer (105); the first microcavity comprises a first groove (1031); the first groove (1031) is arranged on the first sub-forming layer (1021); The second microstructure (104) is located on a surface of the first sub-forming layer (1021) facing away from the substrate (101), and the second microstructure (104) is spaced apart from the first groove (1031); The first sealing layer (1022) is located between the first sub-forming layer (1021) and the transparent protective layer (105), the first sealing layer (1022) and the first groove (1031) enclose the first microcavity, and the sealing layer covers the second microstructure (104).

4. The anti-counterfeiting element according to claim 2, characterized in that: The formation layer (102) comprises: A first sub-forming layer (1021) is located between the substrate (101) and the transparent protective layer (105); the first microcavity comprises a first groove (1031); the first groove (1031) is arranged on the first sub-forming layer (1021); A first sealing layer (1022) is located between the first sub-forming layer (1021) and the transparent protective layer (105), and the first sealing layer (1022) and the first groove (1031) enclose the first microcavity; The second sub-forming layer (1023) is located between the first sealing layer (1022) and the transparent protective layer (105), and the second microstructure (104) is located on a surface of the second sub-forming layer (1023) that is away from the transparent protective layer (105).

5. The anti-counterfeiting element according to any one of claims 1 to 4, characterized in that: It also includes a reflective layer (106) located in the formation layer (102), and the reflective layer (106) coincides with the orthographic projection of the second microstructure (104) on the substrate (101).

6. The anti-counterfeiting element according to claim 5, characterized in that: It also includes a hollow structure (107), wherein the hollow structure (107) is spliced ​​with the second microstructure (104), and the orthographic projections of the hollow structure (107) and the first microstructure (103) on the substrate (101) at least partially overlap; The ratio of the depth to the width of each hollow unit in the hollow structure (107) is greater than a first preset value, or the ratio of the half-height width to the volume of each hollow unit in the hollow structure (107) is greater than a second preset value.

7. The anti-counterfeiting element according to claim 1, characterized in that: The second microstructure (104) includes one or more of a grating structure, a magnetic optically variable ink, a microlens array, a Fresnel lens, a micro-relief structure, a thin film interference structure, and a polarization optically variable structure.

8. The anti-counterfeiting element according to claim 1, characterized in that: The first microstructure (103) further comprises a first fluid medium (1032), wherein the first fluid medium (1032) is filled in the first microcavity, and the first magnetic pigment structure (1033) comprises a Fabry-Perot resonant cavity structure.

9. A method for preparing an anti-counterfeiting element, characterized in that: include: Providing a substrate (101); forming a formation layer (102) on one side surface of the substrate (101); forming at least one first microstructure (103) in the formation layer (102); The step of forming the first microstructure (103) includes: forming a first microcavity inside the microstructure, providing a magnetic pigment structure, and placing the magnetic pigment structure inside the first microcavity; forming at least one second microstructure (104) within the microstructure formation, wherein the second microstructure (104) has a first visual effect; A transparent protective layer (105) is formed on the surface of the microstructure that is away from the substrate (101).

10. An anti-counterfeiting product, characterized in that: The anti-counterfeiting element (100) comprises any one of claims 1-8.

Images