Anti-counterfeiting detection film, identification device and detection method

Abstract

The invention provides an anti-counterfeiting detection film, an identification device and a detection method, the anti-counterfeiting detection film comprises a soft magnetic nano film, the soft magnetic nano film is provided with at least one hollow area, the at least one hollow area forms a coding pattern, and the area of the coding pattern accounts for more than or equal to 25% of the area of the soft magnetic nano film; the soft magnetic nano film has a large Barkhausen effect. According to the invention, the soft magnetic nano film is processed, so that the hollow area is arranged on the soft magnetic nano film, the hollow area can form the coding pattern, and the hollow of the soft magnetic nano film can change the waveform of Barkhausen noise. The intensity of the detected Barkhausen noise is used as a first feature, the coding pattern formed by the hollow soft magnetic nano-film is used as a second feature, the waveform of the Barkhausen noise of the hollow soft magnetic nano-film is used as a third feature, and the anti-counterfeiting detection film is judged to be true only when the three features can correspond to each other. Therefore, the anti-counterfeiting effect is better.

Description

Technical Field

[0001] The present invention relates to the field of anti-counterfeiting technology, and in particular to an anti-counterfeiting detection film, an identification device and a detection method. Background Art

[0002] In actual anti-counterfeiting needs, there is an urgent need for anti-counterfeiting technology that can provide both authenticity identification features and feature codes similar to digital identity codes (digital IDs). A typical application scenario is that the printed product itself has value, and the coding of the printed product has a significant effect on enhancing the value of the printed product. At this time, we not only need to identify the authenticity of the printed product, but also need to identify whether the coding of the printed product has been altered (for example, by patching or splicing multiple genuine products).

[0003] In response to such anti-counterfeiting needs, the current solution is to combine the two aforementioned anti-counterfeiting technologies, use materials with certain anti-counterfeiting features, and make recognizable graphic structures (patterns) as anti-counterfeiting feature sources. This source can not only provide anti-counterfeiting features for authenticity identification, but also obtain feature codes for ID identification with the help of image recognition systems. However, as mentioned above, this anti-counterfeiting feature source can be forged through image copying.

[0004] Therefore, an anti-counterfeiting feature source based on special materials, which can provide a feature code not based on a graphic structure and an anti-counterfeiting detection film that can determine whether the coding of a printed product has been altered, has become an urgent problem to be solved. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] To this end, a first aspect of the present invention provides an anti-counterfeiting detection film.

[0007] A second aspect of the present invention provides an identification device for an anti-counterfeiting detection film.

[0008] A third aspect of the present invention provides a method for detecting an anti-counterfeiting detection film.

[0009] In view of this, the first aspect of the present invention proposes an anti-counterfeiting detection film including: a soft magnetic nanofilm, on which at least one hollow area is arranged, at least one hollow area forms a coding pattern, and the area of ​​the coding pattern accounts for greater than or equal to 25% of the area of ​​the soft magnetic nanofilm; the soft magnetic nanofilm has a large Barkhausen effect.

[0010] In this technical solution, the anti-counterfeiting detection film includes: a soft magnetic nano film, at least one hollow area is provided on the soft magnetic nano film, at least one hollow area forms a coding pattern, and the area of ​​the coding pattern accounts for more than or equal to 25% of the area of ​​the soft magnetic nano film; the soft magnetic nano film has a large Barkhausen effect. Since soft magnetic nano materials will produce a large Barkhausen effect under different magnetic fields, and then obtain Barkhausen noise, and Barkhausen noise is a disordered noise, therefore, in this application, the soft magnetic nano film is processed so that a hollow area is provided on the soft magnetic nano film, and the hollow area can form a coding pattern, and the hollowing of the soft magnetic nano film will change the waveform of the Barkhausen noise. In the present application, the intensity of the detected Barkhausen noise is used as the first feature, the coding pattern formed by the hollowed-out soft magnetic nanofilm is used as the second feature, and the waveform of the Barkhausen noise of the hollowed-out soft magnetic nanofilm is used as the third feature. The first feature, the second feature and the third feature are used to determine whether the detected anti-counterfeiting detection film is genuine. Only when the first feature, the second feature and the third feature all meet the requirements, the anti-counterfeiting detection film is determined to be genuine. Since the third feature, that is, the waveform of the Barkhausen noise of the hollowed-out soft magnetic nanofilm cannot be manually intervened, it has good anti-counterfeiting performance. At the same time, since all three features need to correspond to each other, the anti-counterfeiting detection film is judged to be genuine, the anti-counterfeiting effect is better.

[0011] In some technical solutions, optionally, the soft magnetic nanofilm includes: an amorphous soft magnetic film.

[0012] In this technical solution, the soft magnetic nanofilm includes: an amorphous soft magnetic film. The amorphous soft magnetic film has the characteristics of "short-range order and long-range disorder" in the crystal structure. After carrying the pattern, it can ensure that the relationship between the magnetic domain boundary and the geometric shape is more chaotic. Specifically, using the same material to make anti-counterfeiting elements with the same pattern, analyzing the characteristics of their Barkhausen noise is also different. Therefore, for each soft magnetic nanofilm, it is unique and cannot be copied, which increases the difficulty of counterfeiting, so the anti-counterfeiting effect is better.

[0013] In some technical solutions, optionally, the thickness of the soft magnetic nanofilm is greater than or equal to 50 nanometers and less than or equal to 200 nanometers.

[0014] In this technical solution, the thickness of the soft magnetic nano film is greater than or equal to 50 nanometers and less than or equal to 200 nanometers. Since the Barkhausen noise of the too thin soft magnetic nano film is weak, and the waveform of the Barkhausen noise needs to be detected in this application, the soft magnetic nano film needs to have a certain thickness to ensure the intensity of the Barkhausen noise, and the intensity of the Barkhausen noise can be used as a feature of the detection.

[0015] In some technical solutions, optionally, the coding pattern includes a digital code and / or a QR code.

[0016] In this technical solution, the coding pattern includes a digital code and / or a two-dimensional code, and the coding pattern can be changed to be a digital code or a two-dimensional code, and the digital code and the two-dimensional code are directly set on the anti-counterfeiting detection film, so that the information assigned by the digital code or the two-dimensional code can correspond to the Barkhausen noise generated by the soft magnetic nanofilm assigned to the coding pattern. And the information assigned by the two-dimensional code or the digital code can be used as a second feature to detect the authenticity of the anti-counterfeiting detection film.

[0017] In some technical solutions, optionally, the hollow area is formed by any one of laser, ion beam and electron beam processing methods, and the hollow area includes any one of the shapes of circular holes, square holes, triangular holes, elliptical holes and star-shaped holes.

[0018] In this technical solution, the hollow area is formed by any one of the processing methods of laser, ion beam and electron beam. By forming it by any one of the processing methods of laser, ion beam and electron beam, the processing accuracy of the soft magnetic detection film can be improved. The hollow area includes any one of the shapes of circular holes, square holes, triangular holes, elliptical holes and star-shaped holes. In other words, in addition to forming a QR code or a digital code, the hollow area can also be used as a second feature according to different shapes to identify the authenticity.

[0019] In some technical solutions, optionally, the length of the hollow area in each direction is greater than or equal to 50 microns and less than or equal to 200 microns.

[0020] In this technical solution, the length of the hollow area in each direction is greater than or equal to 50 microns and less than or equal to 200 microns. Since the soft magnetic nanofilm is hollowed out, the effect of too small a size on the Barkhausen noise is small, so the size of the hollow area needs to be greater than or equal to 50 microns. However, too large a size of the hollow area will make it difficult to encode the second feature, and the soft magnetic nanofilm may be damaged, so the hollow area needs to be less than or equal to 200 microns.

[0021] The second aspect of the present invention provides an anti-counterfeiting detection film identification device for identifying the anti-counterfeiting detection film of the first aspect, the anti-counterfeiting detection film identification device comprising: a shell, one end of which is provided with an opening; a detection coil, arranged in the shell, for detecting the Barkhausen noise of the anti-counterfeiting detection film; at least two groups of excitation units, arranged outside the shell, the magnetic field direction formed by any one of the at least two excitation units is different from the magnetic field direction formed by the other excitation units; wherein the shell can shield the influence of the excitation unit on the detection coil.

[0022] In this technical solution, the anti-counterfeiting detection film of the first aspect is identified, and the identification device of the anti-counterfeiting detection film includes: a shell, one end of which is provided with an opening; a detection coil, which is arranged in the shell and is used to detect the Barkhausen noise of the anti-counterfeiting detection film; at least two groups of excitation units, which are arranged outside the shell, and the direction of the magnetic field formed by any of the at least two excitation units is different from the direction of the magnetic field formed by the other excitation units; wherein the shell can shield the influence of the excitation unit on the detection coil. By setting a shell that can shield the excitation unit, the signal-to-noise ratio of the detection coil is reduced to enable better detection. At the same time, at least two groups of excitation units are set, and the direction of the magnetic field formed by each excitation unit is different. By setting the direction of the excitation coil, the test control conditions can be further increased, and more features can be introduced to further increase the value space of the random variable. At the same time, each excitation unit does not work at the same time. In this way, excitation in different directions can be achieved without moving the detector.

[0023] Specifically, the identification device of the anti-counterfeiting detection film also includes: a high-definition camera or a scanning gun. A shell is arranged on the high-definition camera or the scanning gun, so that the identification device of the anti-counterfeiting detection film can detect the image formed by the anti-counterfeiting detection film while checking the Barkhausen noise, thereby realizing the simultaneous detection of the three characteristics of the anti-counterfeiting detection film.

[0024] In some technical solutions, optionally, the outer diameter of the detection coil is less than or equal to 20 mm, and the inner diameter of the detection coil is greater than or equal to 5 mm.

[0025] In this technical solution, the outer diameter of the detection coil is less than or equal to 20 mm, and the inner diameter of the detection coil is less than or equal to 5 mm, which means that the signal source can be effectively covered while meeting the requirements of miniaturization and portability.

[0026] The third aspect of the present invention provides a method for detecting an anti-counterfeiting detection film, which is used in an identification device for an anti-counterfeiting detection film as in the second aspect. The method for detecting an anti-counterfeiting detection film comprises: activating one of at least two groups of excitation units in sequence to obtain at least two detection coils to acquire the detected Barkhausen noise of the anti-counterfeiting detection film; analyzing the characteristics of at least two Barkhausen noises to obtain digital information corresponding to each Barkhausen noise.

[0027] In this technical solution, the detection method of the anti-counterfeiting detection film is used for the identification device of the anti-counterfeiting detection film as in the second aspect. The detection method of the anti-counterfeiting detection film includes: activating one of at least two groups of excitation units in turn to obtain at least two detection coils to obtain the detected Barkhausen noise of the anti-counterfeiting detection film; analyzing the characteristics of at least two Barkhausen noises to obtain the digital information corresponding to each Barkhausen noise. The dynamic characteristics of different frequency sequences can be measured, that is, the excitation frequency is randomly changed to form a unique special sequence, which can be called a dynamic, programmable, excitation frequency encoding, and the existing fixed frequency range excitation and identification is changed into the dynamic excitation and identification of the random frequency sequence within the frequency range. The measured dynamic data is related to the frequency, the frequency sequence, and the anti-counterfeiting element characteristics. By setting the direction of the excitation coil, the test control conditions can be further increased on the basis of the above, and more features can be introduced to further increase the value space of the random variable.

[0028] In some technical solutions, optionally, the step of analyzing the characteristics of at least two Barkhausen noises to obtain digital information corresponding to each Barkhausen noise includes: decomposing the Barkhausen noise using a time-frequency processing method to obtain a decomposition curve; and analyzing the decomposition curve to obtain digital information corresponding to each Barkhausen noise.

[0029] In this technical solution, the steps of analyzing the characteristics of at least two Barkhausen noises and obtaining the digital information corresponding to each Barkhausen noise include: decomposing the Barkhausen noise using a time-frequency processing method to obtain a decomposition curve; analyzing the decomposition curve to obtain the digital information corresponding to each Barkhausen noise, and each grid of each time step can be assigned a numerical value, thereby combining into a sufficiently complex random numerical feature.

[0030] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 One of the structural schematic diagrams of the anti-counterfeiting detection film according to one embodiment of the present invention is shown; Figure 2 A schematic diagram showing the analysis of Barkhausen noise according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of an identification device for an anti-counterfeiting detection film according to an embodiment of the present invention is shown; Figure 4 A schematic diagram showing a detection method of an anti-counterfeiting detection film according to an embodiment of the present invention is shown; Figure 5 A second structural schematic diagram of an anti-counterfeiting detection film according to an embodiment of the present invention is shown; Figure 6 The third structural schematic diagram shows an anti-counterfeiting detection film according to an embodiment of the present invention.

[0032] in, Figure 1 , Figure 3 , Figure 5 and Figure 6 The corresponding relationship between the reference numerals and the component names is as follows: 1 soft magnetic nano film, 2 hollow area, 3 shell, 32 opening, 4 detection coil, 5 excitation unit. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0035] Refer to the following Figures 1 to 6 An anti-counterfeiting detection film, an identification device and a detection method according to some embodiments of the present invention are described.

[0036] According to one embodiment of the present invention, the first aspect of the present invention proposes an anti-counterfeiting detection film including: a soft magnetic nano film 1, on which at least one hollow area 2 is arranged, at least one hollow area 2 forms a coding pattern, and the area of ​​the coding pattern accounts for greater than or equal to 25% of the area of ​​the soft magnetic nano film 1; the soft magnetic nano film 1 has a large Barkhausen effect.

[0037] In this embodiment, if Figure 1As shown, the anti-counterfeiting detection film includes: a soft magnetic nano film 1, at least one hollow area 2 is provided on the soft magnetic nano film 1, at least one hollow area 2 forms a coding pattern, and the area of ​​the coding pattern accounts for more than or equal to 25% of the area of ​​the soft magnetic nano film 1; the soft magnetic nano film 1 has a large Barkhausen effect. Since the soft magnetic nano material will have a large Barkhausen effect under the action of different magnetic fields, and then obtain Barkhausen noise, and Barkhausen noise is a disordered noise, therefore, in the present application, the soft magnetic nano film 1 is processed so that the soft magnetic nano film 1 is provided with a hollow area 2, and the hollow area 2 can form a coding pattern, and the hollowing of the soft magnetic nano film 1 will change the waveform of the Barkhausen noise. In the present application, the intensity of the detected Barkhausen noise is used as the first feature, the coding pattern formed by the hollowed-out soft magnetic nanofilm 1 is used as the second feature, and the waveform of the Barkhausen noise of the hollowed-out soft magnetic nanofilm 1 is used as the third feature. The first feature, the second feature and the third feature are used to determine whether the detected anti-counterfeiting detection film is genuine. Only when the first feature, the second feature and the third feature all meet the requirements, the anti-counterfeiting detection film is determined to be genuine. Since the third feature, that is, the waveform of the Barkhausen noise of the hollowed-out soft magnetic nanofilm 1, cannot be manually intervened, it has good anti-counterfeiting performance. At the same time, since all three features need to correspond to each other, the anti-counterfeiting detection film is judged to be genuine, the anti-counterfeiting effect is better.

[0038] In some embodiments, optionally, the soft magnetic nanofilm 1 includes: an amorphous soft magnetic film.

[0039] In this embodiment, the soft magnetic nanofilm 1 includes: an amorphous soft magnetic film. The amorphous soft magnetic film has the characteristics of "short-range order and long-range disorder" in the crystal structure. After carrying the pattern, it can be ensured that the relationship between the magnetic domain boundary and the geometric shape is more chaotic. Specifically, using the same material to make anti-counterfeiting elements with the same pattern, the characteristics of the Barkhausen noise are also different. Therefore, for each soft magnetic nanofilm 1, it is unique and cannot be copied, which increases the difficulty of counterfeiting, so the anti-counterfeiting effect is better.

[0040] In some embodiments, optionally, the thickness of the soft magnetic nanofilm 1 is greater than or equal to 50 nanometers and less than or equal to 200 nanometers.

[0041] In this embodiment, the thickness of the soft magnetic nano film 1 is greater than or equal to 50 nanometers and less than or equal to 200 nanometers. Since the Barkhausen noise of the too thin soft magnetic nano film 1 is weak, and the waveform of the Barkhausen noise needs to be detected in this application, the soft magnetic nano film 1 needs to have a certain thickness to ensure the intensity of the Barkhausen noise, and the intensity of the Barkhausen noise can be used as a feature of the detection.

[0042] In some embodiments, optionally, the coding pattern includes a digital code and / or a QR code.

[0043] In this embodiment, the coding pattern includes a digital code and / or a two-dimensional code, and the coding pattern can be changed to make the coding pattern a digital code or a two-dimensional code, and the digital code and the two-dimensional code are directly set on the anti-counterfeiting detection film, so that the information assigned by the digital code or the two-dimensional code can correspond to the Barkhausen noise generated by the soft magnetic nano film 1 assigned to the coding pattern. And the information assigned by the two-dimensional code or the digital code can be used as a second feature to detect the authenticity of the anti-counterfeiting detection film.

[0044] In some embodiments, optionally, the hollow area 2 is formed by any one of laser, ion beam and electron beam processing methods, and the hollow area 2 includes any one of the shapes of circular holes, square holes, triangular holes, elliptical holes and star-shaped holes.

[0045] In this embodiment, the hollow area 2 is formed by any one of laser, ion beam and electron beam processing methods. By using any one of laser, ion beam and electron beam processing methods, the processing accuracy of the soft magnetic detection film can be improved. The hollow area 2 includes: any one of a circular hole, a square hole, a triangular hole, an elliptical hole, and a star-shaped hole. In other words, in addition to being able to form a two-dimensional code or a digital code, the hollow area 2 can also be used to form a two-dimensional code or a digital code. Figure 5 and Figure 6 As shown, different shapes can also be used as the second feature to identify the authenticity.

[0046] In some embodiments, optionally, the lengths of the hollow region 2 in all directions are greater than or equal to 50 micrometers and less than or equal to 200 micrometers.

[0047] In this embodiment, the size of the hollow area 2 is greater than or equal to 50 microns and less than or equal to 200 microns. Since the soft magnetic nanofilm 1 is hollowed out, a too small size has little effect on the Barkhausen noise, so the size of the hollow area 2 needs to be greater than or equal to 50 microns. However, a too large size of the hollow area 2 will make the second feature encoding difficult, and the soft magnetic nanofilm 1 may be damaged, so the hollow area 2 needs to be less than or equal to 200 microns.

[0048] The second aspect of the present invention provides an anti-counterfeiting detection film recognition device for identifying the anti-counterfeiting detection film of the first aspect, such as Figure 3As shown, the identification device of the anti-counterfeiting detection film includes: a shell 3, one end of which is provided with an opening 32; a detection coil 4, which is arranged in the shell 3 and is used to detect the Barkhausen noise of the anti-counterfeiting detection film; at least two groups of excitation units 5, which are arranged on the outside of the shell 3, and the direction of the magnetic field formed by any excitation unit 5 of at least two excitation units 5 is different from the direction of the magnetic field formed by other excitation units 5; wherein the shell 3 can shield the influence of the excitation unit 5 on the detection coil 4.

[0049] In this embodiment, the anti-counterfeiting detection film of the first aspect is identified, and the identification device of the anti-counterfeiting detection film includes: a shell 3, one end of which is provided with an opening 32; a detection coil 4, which is arranged in the shell 3 and is used to detect the Barkhausen noise of the anti-counterfeiting detection film; at least two groups of excitation units 5, which are arranged outside the shell 3, and the direction of the magnetic field formed by any of the at least two excitation units 5 is different from the direction of the magnetic field formed by the other excitation units 5; wherein the shell 3 can shield the influence of the excitation unit 5 on the detection coil 4. By setting the shell 3 that can shield the excitation unit 5, the signal-to-noise ratio of the detection coil 4 is reduced, and better detection can be achieved. At the same time, at least two groups of excitation units 5 are set, and the direction of the magnetic field formed by each excitation unit 5 is different. By setting the direction of the excitation coil, the test control conditions can be further increased, and more features can be introduced to further increase the value space of the random variable. At the same time, each excitation unit does not work at the same time. In this way, excitation in different directions can be achieved without moving the detector. In the actual detection device, these three parts are encapsulated together in a potting manner, and the necessary pins are exposed to the outside. During detection, the signal source (anti-counterfeiting element) is placed directly below.

[0050] Specifically, the identification device of the anti-counterfeiting detection film also includes: a high-definition camera or a scanning gun. A shell is arranged on the high-definition camera or the scanning gun, so that the identification device of the anti-counterfeiting detection film can detect the image formed by the anti-counterfeiting detection film while checking the Barkhausen noise, thereby realizing the simultaneous detection of the three characteristics of the anti-counterfeiting detection film.

[0051] In some embodiments, optionally, the outer diameter of the detection coil 4 is less than or equal to 20 mm, and the inner diameter of the detection coil 4 is greater than or equal to 5 mm.

[0052] In this embodiment, the outer diameter of the detection coil 4 is less than or equal to 20 mm, and the inner diameter of the detection coil 4 is less than or equal to 5 mm, which means that the signal source can be effectively covered while meeting the requirements of miniaturization and portability.

[0053] The third aspect of the present invention provides a method for detecting an anti-counterfeiting detection film, such as Figure 4 As shown, the identification device for the anti-counterfeiting detection film according to the second aspect and the detection method of the anti-counterfeiting detection film include: S101: activating one of at least two groups of excitation units in sequence to obtain at least two detection coils to acquire the detected Barkhausen noise of the anti-counterfeiting detection film; S102: Analyze characteristics of at least two Barkhausen noises to obtain digital information corresponding to each Barkhausen noise.

[0054] In this embodiment, the detection method of the anti-counterfeiting detection film is used for the identification device of the anti-counterfeiting detection film as in the second aspect. The detection method of the anti-counterfeiting detection film includes: activating one of at least two groups of excitation units in turn to obtain at least two detection coils to obtain the detected Barkhausen noise of the anti-counterfeiting detection film; analyzing the characteristics of at least two Barkhausen noises to obtain the digital information corresponding to each Barkhausen noise. The dynamic characteristics of different frequency sequences can be measured, that is, the excitation frequency is randomly changed to form a unique special sequence, which can be called a dynamic, programmable, excitation frequency encoding, and the existing fixed frequency range excitation and identification is changed into dynamic excitation and identification of random frequency sequences within the frequency range. The measured dynamic data is related to the frequency, the frequency sequence, and the anti-counterfeiting element characteristics. By setting the direction of the excitation coil, the test control conditions can be further increased on the basis of the above, and more features can be introduced to further increase the value space of the random variable.

[0055] In some embodiments, optionally, the step of analyzing the characteristics of at least two Barkhausen noises to obtain digital information corresponding to each Barkhausen noise includes: decomposing the Barkhausen noise using a time-frequency processing method to obtain a decomposition curve; and analyzing the decomposition curve to obtain digital information corresponding to each Barkhausen noise.

[0056] In this embodiment, if Figure 2 As shown, the step of analyzing the characteristics of at least two Barkhausen noises to obtain the digital information corresponding to each Barkhausen noise includes: decomposing the Barkhausen noise using a time-frequency processing method to obtain a decomposition curve; analyzing the decomposition curve to obtain the digital information corresponding to each Barkhausen noise, and each grid of each time step can be assigned a numerical value, thereby combining into a sufficiently complex random numerical feature.

[0057] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-counterfeiting detection film, characterized in that: include: A soft magnetic nanofilm, wherein at least one hollow region is provided on the soft magnetic nanofilm, at least one of the hollow regions forms a coding pattern, and the area of ​​the coding pattern accounts for greater than or equal to 25% of the area of ​​the soft magnetic nanofilm; The soft magnetic nano film has a large Barkhausen effect.

2. The anti-counterfeiting detection film according to claim 1, characterized in that: The soft magnetic nano film includes: an amorphous soft magnetic film.

3. The anti-counterfeiting detection film according to claim 1, characterized in that: The thickness of the soft magnetic nano film is greater than or equal to 50 nanometers and less than or equal to 200 nanometers.

4. The anti-counterfeiting detection film according to claim 1, characterized in that: The coding pattern includes a digital code and / or a two-dimensional code.

5. The anti-counterfeiting detection film according to any one of claims 1 to 4, characterized in that: The hollow area is formed by any one of laser, ion beam and electron beam processing methods, and the hollow area includes any one of the shapes of circular holes, square holes, triangular holes, elliptical holes and star-shaped holes.

6. The anti-counterfeiting detection film according to claim 5, characterized in that: The length of the hollow area in each direction is greater than or equal to 50 micrometers and less than or equal to 200 micrometers.

7. An identification device for anti-counterfeiting detection film, characterized in that: Used to identify the anti-counterfeiting detection film according to any one of claims 1 to 6, the identification device of the anti-counterfeiting detection film comprises: A shell, one end of which is provided with an opening; A detection coil, disposed in the housing, for detecting the Barkhausen noise of the anti-counterfeiting detection film; At least two groups of excitation units are arranged outside the shell, and the direction of the magnetic field formed by any one of the at least two excitation units is different from the direction of the magnetic field formed by the other excitation units; The shell can shield the influence of the excitation unit on the detection coil.

8. The identification device for anti-counterfeiting detection film according to claim 7, characterized in that: The outer diameter of the detection coil is less than or equal to 20 mm, and the inner diameter of the detection coil is greater than or equal to 5 mm.

9. A method for detecting an anti-counterfeiting detection film, characterized in that: The identification device for the anti-counterfeiting detection film according to claim 7 or 8, wherein the detection method of the anti-counterfeiting detection film comprises: Activating one of at least two groups of the excitation units in sequence, obtaining at least two detection coils to acquire the detected Barkhausen noise of the anti-counterfeiting detection film; The characteristics of at least two of the Barkhausen noises are analyzed to obtain digital information corresponding to each of the Barkhausen noises.

10. The method for detecting anti-counterfeiting detection film according to claim 9, characterized in that: The step of analyzing the characteristics of at least two of the Barkhausen noises to obtain digital information corresponding to each of the Barkhausen noises comprises: Decomposing the Barkhausen noise by using a time-frequency processing method to obtain a decomposition curve; The decomposition curve is analyzed to obtain digital information corresponding to each Barkhausen noise.

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