Magnetic anti-counterfeiting elements and magnetic anti-counterfeiting products

Abstract

The invention provides a magnetic anti-counterfeiting element and a magnetic anti-counterfeiting product, belonging to the technical field of magnetic anti-counterfeiting, and relates to a magnetic anti-counterfeiting element for protecting valuable documents, etc. The magnetic anti-counterfeiting element comprises a first magnetic region and a second magnetic region that can be magnetically encoded, the first magnetic region is composed of a high-coercive force magnetic material with magnetic anisotropy, the second magnetic region is composed of a low-coercive force magnetic material with magnetic anisotropy, the magnetic materials in the first magnetic region and the second magnetic region have magnetic particles, wherein the main magnetic particles in the first magnetic region and the second magnetic region are regularly arranged to form anisotropic fields in different directions, and under different pre-magnetization modes, the magnetic anti-counterfeiting element has significant detection signal characteristics, which cannot be achieved by current conventional magnetic anti-counterfeiting elements, and has high anti-counterfeiting security.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic anti-counterfeiting and valuable documents protected by magnetic anti-counterfeiting elements, in particular to a magnetic anti-counterfeiting element and a magnetic anti-counterfeiting product. Background Art

[0002] Applying magnetic anti-counterfeiting elements, such as anti-counterfeiting strips or anti-counterfeiting lines, to valuable documents is an increasingly used anti-counterfeiting method. Magnetic anti-counterfeiting elements are used to check the authenticity of valuable documents and to achieve rapid sorting of valuable documents. Traditional magnetic anti-counterfeiting elements print magnetic ink directly on the substrate, and then use magnetic sensors to detect the presence or size of residual magnetism. Patents such as GB1127043 and EP0310707 introduce this technology. Patents such as EP0428779, EP2229286, US20100219245, and CN102971748 have improved traditional magnetic anti-counterfeiting elements by using high and low coercive force magnetic materials to print magnetic areas on the substrate. The magnetic sensor can detect the coercive force characteristics in addition to the residual magnetism characteristics of the magnetic material. This technology increases the information carrying capacity of the magnetic anti-counterfeiting element and improves the anti-counterfeiting property of the magnetic anti-counterfeiting element. However, with the continuous development of science and technology, magnetic materials with only high or low coercivity properties are becoming increasingly available. Therefore, magnetic anti-counterfeiting elements printed with magnetic inks with only two coercivity properties are gradually facing the risk of being counterfeited. Summary of the invention

[0003] The object of the present invention is to provide a magnetic anti-counterfeiting element and a magnetic anti-counterfeiting product having the characteristics of residual magnetism, high and low coercive force and magnetic anisotropy detection.

[0004] In order to achieve the above object, an embodiment of the present invention provides a magnetic anti-counterfeiting element, which includes:

[0005] Base material;

[0006] There is a printed magnetic region on the surface of the substrate, and the magnetic region includes an encodable first magnetic region and a second magnetic region, the first magnetic region is composed of a high-coercive force magnetic material with magnetic anisotropy, the second magnetic region is composed of a low-coercive force magnetic material with magnetic anisotropy, the magnetic materials in the first magnetic region and the second magnetic region have magnetic particles, and the main magnetic particles in the first magnetic region and the second magnetic region are regularly arranged.

[0007] Optionally, the regular arrangement of the main magnetic particles in the first magnetic region or the second magnetic region is obtained by drying and forming the magnetic ink magnetized by a magnetic field during the printing process.

[0008] Optionally, main magnetic particles in the first magnetic region and the second magnetic region are regularly arranged along a straight line direction.

[0009] Optionally, an arrangement direction of the main magnetic particles in the first magnetic region is perpendicular to an arrangement direction of the main magnetic particles in the second magnetic region.

[0010] Optionally, a plane formed by a straight line in the arrangement direction of major magnetic particles in the first magnetic region and a straight line in the arrangement direction of major magnetic particles in the second magnetic region is parallel to the surface of the substrate.

[0011] Optionally, the arrangement direction of the main magnetic particles in the first magnetic region and the arrangement direction of the main magnetic particles in the second magnetic region are not parallel to the length direction of the substrate.

[0012] Optionally, an arrangement direction of main magnetic particles in the first magnetic region or the second magnetic region is perpendicular to the surface of the substrate.

[0013] Optionally, the arrangement direction of the main magnetic particles in the first magnetic region is perpendicular to the surface of the substrate, and the arrangement direction of the main magnetic particles in the second magnetic region is parallel to the length direction along the substrate.

[0014] Optionally, the coercive force of the magnetic material in the first magnetic region ranges from 1000 Oe to 3500 Oe.

[0015] Optionally, the magnetic material in the first magnetic region is BaFe 12 O 19 ;

[0016] The morphology structure of the magnetic material in the first magnetic region is a hexagonal structure.

[0017] Optionally, the coercive force of the magnetic material in the second magnetic region ranges from 200 Oe to 700 Oe.

[0018] Optionally, the magnetic material in the second magnetic region is γ-Fe2O3 or CrO2 or doped and modified barium ferrite;

[0019] The morphology structure of the magnetic material in the second magnetic region is a needle-like structure or a sheet-like structure.

[0020] Optionally, the first magnetic region and the second magnetic region are applied to the surface of the substrate in the form of alphanumeric characters or patterns.

[0021] Optionally, the object protected by the magnetic anti-counterfeiting element is anti-counterfeiting paper, anti-counterfeiting document or product packaging.

[0022] An embodiment of the present invention provides a magnetic anti-counterfeiting product, which includes the aforementioned magnetic anti-counterfeiting element.

[0023] Optionally, the magnetic anti-counterfeiting product includes a valuable security or a valuable document.

[0024] Since the magnetic anti-counterfeiting element according to the present invention uses low coercivity with magnetic anisotropy and high coercivity magnetic materials with magnetic anisotropy to print the magnetic area, rather than the aforementioned technology using simple high coercivity and low coercivity magnetic materials to print the magnetic area, high and low coercivity magnetic materials with magnetic anisotropy are more difficult to obtain and have higher anti-counterfeiting properties. More importantly, the magnetic material particles in the magnetic anti-counterfeiting element of the present invention are regularly arranged. Specifically, the main magnetic particles in the first magnetic area and the second magnetic area are regularly arranged to form anisotropic fields in different directions. Under different pre-magnetization modes, the magnetic anti-counterfeiting element has significant detection signal characteristics, rather than the random arrangement in the aforementioned technology, and this is not achievable with current conventional magnetic anti-counterfeiting elements. The present invention increases the anti-counterfeiting properties of the production device and production process of the magnetic anti-counterfeiting element and the product. The manufacturing process of the magnetic anti-counterfeiting element of the present invention is easy and simple, and the product has unique magnetic characteristics and is difficult to forge, so it has higher anti-counterfeiting properties.

[0025] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0027] Figure 1 is a schematic side view of a magnetic anti-counterfeiting element provided in an embodiment of the present invention;

[0028] Figure 2 is a schematic top view of a magnetic anti-counterfeiting element provided in the first embodiment of the present invention;

[0029] Figure 3 is a side view schematic diagram of pre-magnetizing a magnetic anti-counterfeiting element in an embodiment of the present invention;

[0030] Figure 4 is a side view schematic diagram of pre-magnetizing a magnetic anti-counterfeiting element in an embodiment of the present invention;

[0031] Figure 5 is a side view schematic diagram of a detection method for a magnetic anti-counterfeiting element in an embodiment of the present invention;

[0032] Figure 6is a waveform signal of the magnetic anti-counterfeiting element detected by the sensor in the first embodiment of the present invention after three kinds of pre-magnetization;

[0033] Figure 7 is a schematic top view of a magnetic anti-counterfeiting element provided by a second embodiment of the present invention;

[0034] Figure 8 is a side view schematic diagram of pre-magnetizing a magnetic anti-counterfeiting element in an embodiment of the present invention;

[0035] Fig. 9 It is a waveform signal of the magnetic anti-counterfeiting element detected by the sensor after three kinds of pre-magnetization in the second embodiment of the present invention. DETAILED DESCRIPTION

[0036] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0037] exist Figure 1 An example of a magnetic anti-counterfeiting element MAG is shown in FIG, which is a schematic side view, and includes a high-coercive-force magnetic region MAG-H having magnetic anisotropy and a low-coercive-force magnetic region MAG-L having magnetic anisotropy.

[0038] Preferably, the magnetic material in the first magnetic region MAG-H and the second magnetic region MAG-L comprises magnetic particles. For example, the magnetic material may be a material of magnetic particle type, and the magnetic particles may be micron / nanoscale. The magnetic material selected for the first magnetic region MAG-H is BaFe 12 O 19 , the coercive force is 1000Oe~3500Oe, and the morphology structure is a hexagonal structure; preferably, the magnetic material selected for the second magnetic region MAG-L is γ-Fe2O3 or CrO2 or doped modified barium ferrite, the coercive force is 200Oe~700Oe, and the morphology structure is a needle structure or a sheet structure; among them, the book "Ferrite" is edited by, which introduces the magnetic anisotropy characteristics of the magnetic material.

[0039] exist Figure 2The schematic top view of the magnetic anti-counterfeiting element MAG in the first embodiment is shown in the figure, wherein the main magnetic particles of the first magnetic region (MAG-H1) with high coercivity of magnetic anisotropy and the second magnetic region (MAG-L2) with low coercivity of magnetic anisotropy are arranged in a straight line direction, the arrangement directions of the main magnetic particles in MAG-H1 and MAG-L2 are perpendicular, and the plane formed by the straight lines where the two are located is parallel to the surface of the substrate, wherein the arrangement direction of the main magnetic particles in MAG-H1 is at an angle of 45 degrees to the length direction of the substrate, and the arrangement direction of the main magnetic particles in MAG-L2 is at an angle of 135 degrees to the length direction of the substrate. The substrate can be strip-shaped, and the extension direction of the substrate can be the length direction, such as the x-axis direction. The regular arrangement of the main magnetic particles in MAG-H1 and MAG-L2 can be obtained by drying and forming the magnetic ink magnetized by the magnetic field during the printing process. There are magnetic particles in the magnetic ink printed in the magnetic area. The magnetic particles in the magnetic ink magnetized by the magnetic field can be constrained by the magnetic field of the magnetizing device and present a regular arrangement. These magnetic particles with regular arrangement characteristics are the main magnetic particles in the magnetic area after drying and forming. Compared with the morphological structure of the magnetic material in the magnetic ink, the regular arrangement of the main magnetic particles can be observed using an optical microscope.

[0040] The magnetic anti-counterfeiting element MAG in the first embodiment of the present invention is produced by gravure printing, wherein the first printing color group prints the first magnetic area (MAG-H1), and the second printing color group prints the second magnetic area (MAG-L2). During the printing process, the magnetic ink is first magnetized by a magnetizing device and then dried and formed. Specifically, the magnetic ink for printing the first magnetic area MAG-H1 passes through a magnetizing device whose magnetic lines of force form an acute angle with the printing direction, such as 45 degrees, and then dried and formed. The magnetic ink for printing the second magnetic area MAG-L2 passes through a magnetizing device whose magnetic lines of force form an obtuse angle with the printing direction, such as 135 degrees, and then dried and formed; wherein, after any one of the printed magnetic areas is dried and formed, another magnetic area can be printed; the printing direction can be the length direction of the substrate.

[0041] exist Figure 3 The figure shows the pre-magnetization process of the magnetic anti-counterfeiting element MAG in the first embodiment after printing and before detection by the magnetic sensor Sensor. It is a side view schematic diagram, in which the N pole (or N pole segment) of the magnet Magnet used for pre-magnetization is perpendicular to the substrate, and the N pole of the magnet can be in the length direction of the substrate, and the magnetic field strength is about 5000Oe.

[0042] exist Figure 4The figure shows the pre-magnetization process of the magnetic anti-counterfeiting element MAG in the first embodiment after printing and before detection by the magnetic sensor Sensor. It is a side view schematic diagram, in which the N pole of the magnet Magnet used for pre-magnetization is perpendicular to the substrate, and the magnetic field strength has two modes of approximately 600Oe and 5000Oe.

[0043] exist Figure 5 The detection method of the magnetic anti-counterfeiting element MAG is shown in FIG. The sensor is a magnetic sensor, preferably a coil-type magnetic sensor. Before the sensor is detected, the MAG is subjected to Figure 3 or Figure 4 or Figure 8 Pre-magnetization of the middle magnet.

[0044] exist Figure 6 FIG. 5 shows the signal characteristics of the magnetic regions MAG-H1 and MAG-L2 detected by the magnetic sensor Sensor, with the detection signal of MAG-H1 on the left and the detection signal of MAG-L2 on the right.

[0045] Figure 6 (a) shows the magnetic anti-counterfeiting element MAG passing through Figure 3 After pre-magnetization in the manner shown, the signal characteristics detected by the magnetic sensor Sensor are the detection signal of MAG-H1 on the left and the detection signal of MAG-L2 on the right. The two signals are the same, and the detection signals can be two full-wave detection signals.

[0046] Figure 6 (b)( Figure 6 (b) is Figure 6 (a) shows that the magnetic anti-counterfeiting element MAG passes through Figure 3 and Figure 4 The pre-magnetization method shown in Figure 4 In the magnetization method shown, a magnet with a magnetic field strength of about 600Oe is selected for pre-magnetization. The signal characteristics detected by the magnetic sensor Sensor are as follows: the detection signal of MAG-H1 on the left and the detection signal of MAG-L2 on the right. The detection signal of MAG-H1 remains unchanged and is still a full-wave detection signal, while the detection signal of MAG-L2 disappears.

[0047] Figure 6 (c) shows the magnetic security element MAG passing through Figure 4 The pre-magnetization method shown in the figure uses Magnet pre-magnetization with a magnetic field strength of about 5000Oe. The signal characteristics detected by the magnetic sensor Sensor are: the detection signal of MAG-H1 on the left, which is still a full-wave detection signal, and the detection signal of MAG-L2 on the right. The phase information of the detection signal of MAG-L2 is opposite to that of the detection signal of MAG-H1.

[0048] exist Figure 7 A side view schematic diagram of the magnetic anti-counterfeiting element MAG in the second embodiment is shown in the figure, wherein the main magnetic particles of the first magnetic region MAG-H3 with high coercivity and magnetic anisotropy and the second magnetic region MAG-L4 with low coercivity and magnetic anisotropy are arranged in a straight line, and the arrangement directions of the main magnetic particles in MAG-H3 and MAG-L4 are perpendicular, wherein the arrangement direction of the main magnetic particles in MAG-H3 is perpendicular to the surface of the substrate, and the arrangement direction of the main magnetic particles in MAG-L4 is parallel to the length direction of the substrate surface.

[0049] The magnetic anti-counterfeiting element MAG in the second embodiment of the present invention is produced by gravure printing, wherein the first printing color group prints the first magnetic area MAG-H3, and the second printing color group prints the second magnetic area MAG-L4. During the printing process, the magnetic ink is first magnetized by a magnetizing device and then dried and formed. Specifically, the magnetic ink for printing the first magnetic area MAG-H3 passes through a magnetizing device whose magnetic lines of force are perpendicular to the substrate, and then dried and formed. The magnetic ink for printing the second magnetic area MAG-L4 passes through a magnetizing device whose magnetic lines of force are parallel to the length direction of the substrate, and then dried and formed.

[0050] exist Figure 8 The figure shows the pre-magnetization process of the magnetic anti-counterfeiting element MAG in the first embodiment after printing and before detection by the magnetic sensor Sensor. It is a side view schematic diagram, in which the N pole of the magnet Magnet used for pre-magnetization is parallel to the length direction of the substrate, the N pole of the magnet is closer to the substrate than its S pole, and the magnetic field strength is about 5000Oe.

[0051] exist Fig. 9 The signal characteristics of the magnetic areas MAG-H3 and MAG-L4 detected by the magnetic sensor are shown in FIG. Figure 5 The left side shows the detection signal of MAG-H3, and the right side shows the detection signal of MAG-L4.

[0052] Fig. 9 (a) shows the magnetic anti-counterfeiting element MAG passing through Figure 3 After pre-magnetization in the manner shown, the signal characteristics detected by the magnetic sensor Sensor are the detection signal of MAG-H3 on the left and the detection signal of MAG-L4 on the right. The two signals are the same, and the detection signals can be two full-wave detection signals.

[0053] Fig. 9 (b)( Fig. 9 (b) is Fig. 9 (a) shows that the magnetic anti-counterfeiting element MAG passes through Figure 3 and Figure 4 The pre-magnetization method shown in Figure 4 In the magnetization method shown, a magnet with a magnetic field strength of about 600Oe is selected for pre-magnetization. The signal characteristics detected by the magnetic sensor Sensor are as follows: the detection signal of MAG-H3 on the left and the detection signal of MAG-L4 on the right. The detection signal of MAG-H3 remains unchanged, while the detection signal of MAG-L4 disappears.

[0054] Fig. 9 (c) shows the magnetic security element MAG passing through Figure 8 After pre-magnetization in the manner shown, the signal characteristics detected by the magnetic sensor Sensor are as follows: the detection signal of MAG-H3 on the left and the detection signal of MAG-L4 on the right. The detection signal amplitude of MAG-H3 is relatively large. Fig. 9 (a) is significantly increased, and the shape becomes a half-wave shape. The detection signal of MAG-L4 can still be a full-wave detection signal, and the detection signal amplitude is relatively large. Fig. 9 (a) Basically unchanged.

[0055] The embodiment of the present invention also provides a magnetic anti-counterfeiting product, which includes the aforementioned magnetic anti-counterfeiting element. The magnetic anti-counterfeiting product includes securities or valuable documents, such as banknotes, bank notes, bonds, tickets or certificates.

[0056] Since the magnetic anti-counterfeiting element in this embodiment is encoded by a high coercive force magnetic region MAG-H with magnetic anisotropy and a low coercive force magnetic material MAG-L with magnetic anisotropy, the magnetic anti-counterfeiting element organically integrates multiple magnetic characteristics such as the remanence, coercive force, and magnetic anisotropy characteristics of the magnetic material, and can carry more coded information. The detection signal can be realized Figure 6 and Fig. 9 The changes in multiple dimensions are impossible to achieve with conventional magnetic anti-counterfeiting elements, greatly improving the anti-counterfeiting properties of securities.

[0057] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0059] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium can be non-transient, and the storage medium can include: U disk, hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), flash memory (Flash memory), disk or optical disk and other media that can store program codes.

[0060] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A magnetic anti-counterfeiting element, characterized in that: The magnetic anti-counterfeiting element comprises: Base material; The substrate has a printed magnetic region on its surface, and the magnetic region includes an encodable first magnetic region and a second magnetic region, The first magnetic region is composed of a high coercivity magnetic material having magnetic anisotropy, The second magnetic region is composed of a low coercive force magnetic material having magnetic anisotropy, The magnetic material in the first magnetic region and the second magnetic region comprises magnetic particles, The main magnetic particles in the first magnetic region and the second magnetic region are regularly arranged; The main magnetic particles in the first magnetic region and the second magnetic region are regularly arranged along a straight line direction; A plane formed by a straight line in the arrangement direction of the main magnetic particles in the first magnetic region and a straight line in the arrangement direction of the main magnetic particles in the second magnetic region is parallel to the surface of the substrate; The first magnetic region and the second magnetic region are pre-magnetized in a first magnetization mode and a second magnetization mode in sequence; The first magnetization method includes: The N pole of the magnet used for pre-magnetization is perpendicular to the substrate, and the N pole of the magnet is in the length direction of the substrate; The second magnetization method includes: The N pole of the magnet used for pre-magnetization is perpendicular to the substrate, and the N pole of the magnet is in the width direction of the substrate.

2. The magnetic anti-counterfeiting element according to claim 1, characterized in that: The regular arrangement of the main magnetic particles in the first magnetic region and the second magnetic region is obtained during the printing process by drying and forming the magnetic ink magnetized by a magnetic field.

3. The magnetic anti-counterfeiting element according to claim 1, characterized in that: The arrangement direction of the main magnetic particles in the first magnetic region is perpendicular to the arrangement direction of the main magnetic particles in the second magnetic region.

4. The magnetic anti-counterfeiting element according to claim 1, characterized in that: The arrangement direction of the main magnetic particles in the first magnetic region and the arrangement direction of the main magnetic particles in the second magnetic region are not parallel to the length direction along the substrate.

5. The magnetic anti-counterfeiting element according to claim 1, characterized in that: The coercive force of the magnetic material in the first magnetic region ranges from 1000 Oe to 3500 Oe.

6. The magnetic anti-counterfeiting element according to claim 5, characterized in that: The magnetic material in the first magnetic region is BaFe 12 O 19 ; The morphology structure of the magnetic material in the first magnetic region is a hexagonal structure.

7. The magnetic anti-counterfeiting element according to claim 1, characterized in that: The coercive force of the magnetic material in the second magnetic region ranges from 200 Oe to 700 Oe.

8. The magnetic anti-counterfeiting element according to claim 7, characterized in that: The magnetic material in the second magnetic region is γ-Fe2O3 or CrO2 or doped and modified barium ferrite; The morphology structure of the magnetic material in the second magnetic region is a needle-like structure or a sheet-like structure.

9. The magnetic anti-counterfeiting element according to any one of claims 1 to 8, characterized in that: The first magnetic region and the second magnetic region are applied to the surface of the substrate in the form of alphanumeric characters or patterns.

10. The magnetic anti-counterfeiting element according to any one of claims 1 to 8, characterized in that: The object protected by the magnetic anti-counterfeiting element includes any one of anti-counterfeiting paper, anti-counterfeiting document and product packaging.

11. A magnetic anti-counterfeiting product, characterized in that: The magnetic anti-counterfeiting product comprises the magnetic anti-counterfeiting element according to any one of claims 1 to 10.

12. The magnetic anti-counterfeiting product according to claim 11, characterized in that: The magnetic anti-counterfeiting product includes a valuable security or a valuable document.

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