A magnetic identification device, method and system and a magnetically encoded object to be detected

Abstract

The present invention discloses a magnetic identification device, method and system and a test object with magnetic coding, the method comprising: moving the magnetic coding to a first magnetic field, magnetizing a magnetic pattern using the first magnetic field, detecting the first magnetic moment orientation of each magnetic pattern, the angle between the straight line where the magnetic moment orientation of at least one magnetic pattern is located and the straight line where the magnetization direction is located is an acute angle; moving the magnetic coding to a second magnetic field, magnetizing the magnetic pattern using the second magnetic field, detecting the second magnetic moment orientation of each magnetic pattern; determining the coercive force of the corresponding magnetic pattern through the first magnetic moment orientation and the second magnetic moment orientation; determining the magnetic coding information corresponding to each magnetic image according to the detected first magnetic moment orientation and the second magnetic moment orientation and the coercive force. The magnetic identification device of the present invention is not limited to detecting magnetic coding perpendicular or parallel to the surface of the test object, improving the diversity of magnetic moment orientation detection, and providing more coding numbers.

Description

Technical Field

[0001] The present invention relates to the field of magnetic coding technology, and in particular to a magnetic identification device, method and system, and a detected object with magnetic coding. Background Art

[0002] In daily life, valuable documents such as banknotes, checks, bank cards, tickets, stamps, certificates, admission tickets or other such objects are equipped with security elements containing magnetic materials for anti-counterfeiting or confidentiality, such as a magnetic medium strip (security thread) in a banknote.

[0003] In the prior art, the security element usually uses magnetic materials with different coercive forces for magnetic encoding. For example, two magnetic materials with different coercive forces are used to form two magnetic regions, which can be arranged side by side or overlapped. However, with the continuous improvement of anti-counterfeiting technology, the magnetic encoding of the security element also adds the magnetic moment orientation of the magnetic material, that is, the magnetic encoding of the security element uses a mixed magnetic encoding of the coercive force of the magnetic material plus the magnetic moment orientation. For the identification and detection of this mixed magnetic encoding, it is necessary to distinguish the coercive force of the magnetic material and the magnetic moment orientation at the same time to determine the authenticity of the security element. However, in the existing public technology, such as the disclosed Chinese patent: Magnetic sensor for checking for counterfeit bills (Chinese patent publication number: CN102272613A) and securities processing method and equipment (Chinese patent publication number: CN102576477A), it can realize the distinction of the high and low coercive forces of magnetic materials, but cannot realize the determination of magnetic moment orientation at the same time.

[0004] The above-mentioned published Chinese patents, in order to distinguish the high and low coercive force of the magnetic material of the security element, the security element is first magnetized by a magnetizing device, and after magnetization, it is away from the magnetizing magnetic field, and then the residual magnetism of the security element containing the magnetic material is detected by a magnetic sensor. These schemes usually require the use of two sets of magnetizing devices and two sets of magnetic sensors, that is, the detection of the security element is scanned twice, and the results of the two scans are different. By processing the results of the two scans, the magnetic material coercive force information of the security element is obtained, that is, the determination of the coercive force size.

[0005] There are also technical solutions for identifying magnetic moment orientation in the prior art, such as the published Chinese patent: Magnetic moment orientation device for identifying magnetic patterns on magnetic stripes and its identification method (Chinese patent publication number: CN 103268658A), which can determine the magnetic moment orientation and coercive force of magnetic materials, but can only distinguish between the magnetic moment orientation perpendicular to the bill plane and the magnetic moment orientation parallel to the bill plane, making the identifiable magnetic moment orientation relatively single. In addition, in this solution, the object to be tested can only be moved in one direction for magnetic encoding identification, which is inconvenient to use. Summary of the invention

[0006] Therefore, the present invention aims to solve the problem in the prior art that the magnetic moment orientation that can be identified is relatively single and inconvenient to use, thereby providing a magnetic identification device, method and system and a detected object with magnetic coding.

[0007] According to one aspect of an embodiment of the present invention, a magnetic encoding recognition method is provided, which is used to recognize a magnetic encoding having a plurality of magnetic graphics, wherein the angle between a straight line where the magnetic moment orientation of at least one magnetic graphic is located and a straight line where the magnetization direction is located is an acute angle, and the magnetic encoding recognition method comprises: moving the magnetic encoding to a first magnetic field, magnetizing the magnetic graphic using the first magnetic field, and detecting a first magnetic moment orientation of each magnetic graphic, wherein the first magnetic field is an excitation magnetic field formed by a first magnet and a second magnet arranged side by side with the same magnetization direction above the first magnet or the second magnet; moving the magnetic encoding to a second magnetic field, magnetizing the magnetic graphic using the second magnetic field, and detecting a second magnetic moment orientation of each magnetic graphic, wherein the second magnetic field is an excitation magnetic field formed above a magnetic sensor arranged between the first magnet and the second magnet; determining the coercive force of the corresponding magnetic graphic by the first magnetic moment orientation and the second magnetic moment orientation; and determining the magnetic encoding information corresponding to each magnetic image according to the detected first magnetic moment orientation and the second magnetic moment orientation and the coercive force.

[0008] Optionally, determining the coercive force of the corresponding magnetic graphic by the first magnetic moment orientation and the second magnetic moment orientation includes: when the second magnetic moment orientation is exactly the same as the first magnetic moment orientation, determining that the corresponding magnetic graphic is encoded as high coercive force; when the second magnetic moment orientation is opposite to the first magnetic moment orientation, determining that the corresponding magnetic graphic is encoded as low coercive force.

[0009] Another aspect of the embodiments of the present invention further provides an object to be tested with magnetic coding, wherein the magnetic coding includes a plurality of magnetic graphics, and the angle between the straight line where the magnetic moment orientation of at least one magnetic graphic is located and the straight line where the magnetization direction is located is an acute angle.

[0010] Optionally, the magnetic pattern further includes a magnetic pattern in which the straight line where the magnetic moment orientation is located is perpendicular or parallel to the straight line where the magnetization direction is located.

[0011] According to one aspect of an embodiment of the present invention, a magnetic identification device is provided, comprising: a first magnet, a second magnet and a magnetic sensor, wherein the first magnet and the second magnet are arranged side by side and have the same magnetization direction, the magnetization direction is parallel to the arrangement direction, and an excitation magnetic field is formed around the first magnet and the second magnet; the magnetic sensor is arranged between the first magnet and the second magnet, and is used to detect the coercive force and magnetic moment orientation on the object under test; wherein the magnetic moment orientation at least includes a magnetic moment orientation in which the angle between the straight line where the magnetic moment is located and the straight line where the magnetization direction is located is an acute angle, the excitation magnetic field includes a first magnetic field formed above the first magnet or the second magnet and a second magnetic field formed above the magnetic sensor, and the magnetic field strength of the first magnetic field is greater than the magnetic field strength of the second magnetic field.

[0012] Optionally, the first magnet or the second magnet is a permanent magnet or a soft magnet.

[0013] Optionally, the first magnet and the second magnet are elongated magnets of the same size, and the arrangement direction is perpendicular to the length direction of the elongated magnets.

[0014] Optionally, the magnetic sensor is an array composed of a plurality of magnetic detection components, and the arrangement direction of the plurality of magnetic detection components is parallel to the length direction of the elongated magnet.

[0015] Optionally, the magnetic detection component is a single magnetoresistance, a magnetoresistance half bridge, or a magnetoresistance full bridge.

[0016] Optionally, the sensitivity direction of the magnetic detection component includes at least one of the following: a direction parallel to the arrangement direction, a direction perpendicular to the surface of the object to be measured, and a direction parallel to the surface of the object to be measured and perpendicular to the arrangement direction.

[0017] Optionally, the magnetic moment orientation of the object under test includes a first type of magnetic moment orientation with high coercivity and a second type of magnetic moment orientation with low coercivity; the first magnetic field can change the first type of magnetic moment orientation, and the second magnetic field cannot change the first type of magnetic moment orientation but can change the second type of magnetic moment orientation.

[0018] Another aspect of the embodiments of the present invention provides a magnetic identification system, including: the magnetic identification device mentioned above and the object to be detected with the magnetic code mentioned above.

[0019] The present invention can achieve the following technical effects:

[0020] 1. In the embodiment of the present invention, the magnetic code is first magnetized in the first magnetic field formed by the first magnet and the second magnet arranged side by side in the same magnetization direction, and then enters the second magnetic field. During this process, the magnetic sensor detects the coercive force and magnetic moment orientation of the magnetic code. Since the magnetic moment orientation of the magnetic code at least includes the magnetic moment orientation in which the angle between the straight line and the straight line in the magnetization direction is an acute angle, the magnetic identification device is not limited to detecting the magnetic code perpendicular or parallel to the surface of the object to be measured, which improves the diversity of magnetic moment orientation detection, thereby providing more codes.

[0021] 2. By setting the first magnet and the second magnet in the same magnetizing direction and arranged side by side, the magnetic sensor is set between the first magnet and the second magnet, so that a magnetic field with a larger magnetic field strength can be formed above the first magnet or the second magnet and a magnetic field with a relatively smaller magnetic field strength can be formed above the magnetic sensor. When the object to be measured with the magnetic code moves along the magnetizing direction (or reverse), the magnetic code is first magnetized by the first magnetic field and then enters the second magnetic field. In this process, the magnetic sensor detects the coercive force and magnetic moment orientation of the magnetic code. Since the magnetic moment orientation of the magnetic code at least includes the magnetic moment orientation in which the angle between the straight line and the straight line in the magnetizing direction is an acute angle, the magnetic identification device is not limited to detecting the magnetic code perpendicular or parallel to the surface of the object to be measured, which improves the diversity of magnetic moment orientation detection and provides more codes; on the other hand, since the magnetic sensor is set between the first magnet and the second magnet, the coercive force and magnetic moment orientation of the magnetic code can be detected regardless of whether the object to be measured moves forward or backward, avoiding misdetection and facilitating use.

[0022] 3. A set of horizontal magnetization structures (two magnets) and a magnetic sensor are used to effectively detect the magnetic information of magnetic graphics, reduce costs, and facilitate product miniaturization, which is in line with the development trend of miniaturization and integration of modern electronic components.

[0023] 4. An array of multiple magnetic detection components is set as a magnetic sensor. The arrangement direction of the multiple magnetic detection components is parallel to the length direction of the long strip magnet. The sensitivity direction of each magnetic detection component can be different to measure different magnetic moment orientations to improve the detection accuracy.

[0024] 5. According to the magnetic moment orientation of the magnetic code on the object to be measured, the corresponding sensitivity direction is set respectively to realize the precise magnetic moment orientation detection for the specific object to be measured, so as to further improve the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 is a schematic diagram of a magnetic identification device according to an embodiment of the present invention;

[0027] Figure 2 A view of the magnetic identification device according to an embodiment of the present invention in the xz plane;

[0028] Figure 3 Schematic diagram of magnetic field distribution in the xz plane of a magnetic identification device according to an embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of the magnetic field distribution of the x component of the magnetic identification device according to an embodiment of the present invention;

[0030] Figure 5a A schematic diagram of the easy magnetization direction of magnetic encoding according to an example of the present invention;

[0031] Figure 5b It is a schematic diagram of the magnetic moment orientation of the magnetic encoding after being magnetized by the first magnetic field in an embodiment of the present invention;

[0032] Figure 5c A schematic diagram of the magnetic moment orientation of the high coercive force magnetic encoding after the first magnetic field and the second magnetic field in an embodiment of the present invention;

[0033] Figure 5d A schematic diagram of the magnetic moment orientation of the low coercive force magnetic encoding in an embodiment of the present invention after passing through the first magnetic field and the second magnetic field;

[0034] Figure 5e Schematic diagram of magnetic moment orientation types of magnetic encoding in an embodiment of the present invention;

[0035] Figure 6 is a view of the xy plane of the magnetic identification device according to an embodiment of the present invention;

[0036] Figure 7a is a magnetic image of the x component of the magnetic field of an embodiment of the present invention;

[0037] Figure 7b is a magnetic image of the y component of the magnetic field according to an embodiment of the present invention;

[0038] Figure 7c is a magnetic image of the z component of the magnetic field of an embodiment of the present invention;

[0039] Figure 8Schematic diagram of the distribution of the z component of the magnetic field according to an embodiment of the present invention;

[0040] Fig. 9 The magnetic encoding process of the embodiment of the present invention Figure 8 Schematic diagram of the magnetized magnetic field shown;

[0041] Fig.10 Magnetic images of the x, y and z components of the magnetic field of an embodiment of the present invention;

[0042] Fig.11 The present invention is a flowchart of a magnetic coding recognition method according to an embodiment of the present invention.

[0043] Reference numerals:

[0044] 1-first magnet; 2-second magnet;

[0045] 3- Magnetic sensor. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Example 1

[0051] The embodiment of the present invention provides a magnetic identification device for identifying the coercive force and magnetic moment orientation of a magnetically encoded object. Figure 1 As shown, the magnetic identification device includes: a first magnet 1, a second magnet 2 and a magnetic sensor 3, wherein the first magnet 1 and the second magnet 2 are arranged side by side and have the same magnetization direction, the magnetization direction is parallel to the arrangement direction, and an excitation magnetic field is formed around the first magnet 1 and the second magnet 2. The first magnet 1 or the second magnet 2 is a permanent magnet or a soft magnet, that is, the first magnet 1 and the second magnet 2 can be both permanent magnets, or both soft magnets, or one is a permanent magnet and the other is a soft magnet. The permanent magnet can be made of neodymium iron boron, samarium cobalt or hard ferrite; the soft magnet can be made of silicon steel sheet, permalloy or soft ferrite, and can also be realized by a coil or a coil plus a soft magnetic material.

[0052] In an optional implementation manner of the embodiment of the present invention, the first magnet 1 and the second magnet 2 may be elongated magnets of the same size, and the arrangement direction is perpendicular to the length direction of the elongated magnets.

[0053] For ease of description, the embodiment of the present invention takes a long strip magnet as an example, and establishes a coordinate system in the space where the magnetic identification device is located. Figure 1 As shown, the first magnet and the second magnet are arranged along the x-axis in the xy plane, and the magnetization direction is the positive direction of the x-axis (of course, it can also be the negative direction of the x-axis). The first magnet and the second magnet are placed along the y-axis. The view of the xz plane is as shown Figure 2 shown.

[0054] The magnetic sensor 3 is arranged between the first magnet 1 and the second magnet 2, and is used to detect the coercive force and magnetic moment orientation on the object to be measured; wherein the magnetic moment orientation at least includes that the angle between the straight line where it is located and the straight line where the magnetization direction is located is an acute angle, and the excitation magnetic field includes a first magnetic field formed above the first magnet 1 or the second magnet 2 and a second magnetic field formed above the magnetic sensor 3, and the magnetic field strength of the first magnetic field is greater than the magnetic field strength of the second magnetic field. The specific magnetic field distribution is as follows Figure 3 and Figure 4 In the embodiment of the present invention, the straight line where the magnetic moment orientation is located and the straight line where the magnetization direction is located form an acute angle, which may mean that the magnetic moment orientation and the positive direction of the x-axis form an acute angle or an obtuse angle, for example, 45° or 135°.

[0055] In the embodiment of the present invention, the detection of coercive force is mainly to detect whether the magnetic material of the magnetic encoding is high coercive force or low coercive force through the detection result. High coercive force and low coercive force refer to the relative coercive force size, and the specific coercive force value can be set as needed. The magnetic moment orientation of the object to be measured in the embodiment of the present invention includes the first type of magnetic moment orientation of the magnetic encoding with high coercive force and the second type of magnetic moment orientation of the magnetic encoding with low coercive force; the first magnetic field can change the first type of magnetic moment orientation, and the second magnetic field cannot change the first type of magnetic moment orientation but can change the second type of magnetic moment orientation. The first magnetic field and the second magnetic field refer to the magnetic fields generated by the first magnet and the second magnet around the object to be measured, respectively. The positions of the first magnetic field and the second magnetic field can be achieved by the structural setting of the magnetic identification device. Specifically, the required magnetic field distribution effect can be achieved by adjusting the dimensions of the first magnet and the second magnet in the x and z directions, the spacing between the two magnets, and the height between the entire device and the object to be measured (z direction distance). In order to achieve the preset effect, these dimensions need to be optimized, and the optimization results can be obtained by simulation and actual measurement.

[0056] In the embodiment of the present invention, the first type of magnetic moment orientation and the second type of magnetic moment orientation are classified according to the magnitude of the coercive force of the magnetic encoding, and the directions of the magnetic moment orientations in different categories may be the same or different.

[0057] Due to different magnetic moment orientations, under the excitation of an external magnetic field, an external magnetic field parallel to the easy magnetization direction is easy to magnetize the magnetic material; while an external magnetic field perpendicular to the easy magnetization direction is not easy to magnetize the magnetic material. The size of the coercive force determines the size of the external magnetic field required to change its magnetization direction. Magnetic materials with high coercive force are not easily changed in magnetization direction by an external magnetic field after being magnetized; magnetic materials with low coercive force are more easily changed in magnetization direction by an external magnetic field after being magnetized. Among them, the magnetization direction is parallel to the magnetic moment orientation, and the magnetic moment orientation is the final presentation result of the magnetization direction. When the magnetization direction changes, the magnetic moment orientation is opposite to the original magnetization direction. On the contrary, if it does not change, the two remain in the same direction. In the embodiment of the present invention, by setting an easy magnetization direction (that is, magnetic moment orientation) that is at an acute angle to the magnetization direction, due to the relative position relationship between the first magnetic field and the second magnetic field and the object to be measured, when the object to be measured moves, each magnetic pattern direction is magnetized separately, which is convenient for the magnetic sensor to identify.

[0058] In order to more clearly describe the embodiments of the present application, three easy magnetization directions are used for illustration. Specifically, the easy magnetization directions are divided into: the moving direction (x-axis direction), the direction with a positive or negative angle to the moving direction (x-axis direction), such as Figure 5a Preferably, the angles between the easy magnetization direction and the traveling direction (x-axis direction) are ±45°.

[0059] When the magnetic code passes over the first magnet, the first magnetic field (which can be called the pre-excitation field) causes the magnetic moment orientation of the magnetic code to have three states, such as Figure 5b shown.

[0060] When the magnetic encoding passes over the air gap between the first magnet and the second magnet (ie, over the magnetic sensor), the second magnetic field (which may be referred to as the in-situ excitation field) produces different effects on the high coercive force magnetic encoding and the low coercive force magnetic encoding.

[0061] When the magnetic encoding is high coercivity magnetic encoding, the second magnetic field is insufficient to change the magnetic moment orientation, and the magnetic encoding magnetization state changes very little (or remains essentially unchanged), such as Figure 5c shown.

[0062] When the magnetic encoding is low coercivity magnetic encoding, the second magnetic field reverses the magnetic moment orientation, such as Figure 5d shown.

[0063] In this way, the three easy magnetization directions of the magnetic code, combined with high coercivity and low coercivity materials, have six states when the magnetic code passes over the magnetic sensor, such as Figure 5e shown.

[0064] In order to more accurately detect the magnetic moment orientation of different magnetic codes, the magnetic sensor in the embodiment of the present invention is an array composed of multiple magnetic detection components, and the arrangement direction of the multiple magnetic detection components is parallel to the length direction of the long strip magnet. The length direction mentioned here can refer to the y-axis direction, such as Figure 6 As shown. Each magnetic detection component can be a single magnetoresistance or a magnetoresistance half bridge or a magnetoresistance full bridge. The sensitivity directions of each magnetic detection component can be different to measure different magnetic moment orientations to improve the accuracy of detection.

[0065] Of course, in order to increase the universality of the magnetic identification device, the sensitivity direction of the magnetic detection component in the embodiment of the present invention includes at least one of the following: a direction parallel to the arrangement direction (that is, the x-axis direction), a direction perpendicular to the arrangement direction and parallel to the direction pointing to the object to be measured (z-axis direction), and a direction perpendicular to the arrangement direction and parallel to the length direction of the long strip magnet (y-axis direction). In the embodiment of the present invention, magnetic detection components in the above three directions can be used, so that magnetic moment orientations at different angles can be detected. Of course, in order to further improve the accuracy of the detection, the corresponding sensitivity directions can be set according to the magnetic moment orientation of the magnetic encoding on the object to be measured, so as to realize accurate magnetic moment orientation detection for a specific object to be measured.

[0066] In the embodiment of the present invention, multiple magnetic detection components are used to form an array, and multiple magnetic detection components are used to collect multi-channel signals, so that the magnetic image of magnetic encoding can be detected. The magnetic images of the above six magnetic moment orientations are displayed as follows according to the different magnetic field components detected. Figure 7a , 7b According to these six different magnetic images, different easy magnetization directions and high and low coercive forces can be encoded, for example, the three easy magnetization directions can be encoded as A, B, and C, and the high and low coercive forces can be encoded as 0 and 1.

[0067] For the upper surface of the magnet, the distribution of the z component of the magnetic field is as follows: Figure 8 As shown, for the magnetic encoding with easy magnetization direction in the z direction, after the excitation of the z-direction magnetic field, the magnetic moment of the magnetic encoding changes as follows: Fig. 9 As shown in Figure 2. When it moves above the sensor, the detected magnetic image is divided into different components of the detected magnetic field as shown in Figure 2. Fig.10 The magnetic images of different magnetic field components are different from the magnetic code images with easy magnetization directions in the xy plane, so the magnetic identification sensor can also identify the magnetic code with easy magnetization directions in the z direction.

[0068] According to the embodiments of the present invention, it can be concluded that the present invention can achieve the following technical effects:

[0069] 1. By setting the first magnet and the second magnet in the same magnetizing direction and arranged side by side, the magnetic sensor is set between the first magnet and the second magnet, so that a magnetic field with a larger magnetic field strength can be formed above the first magnet or the second magnet and a magnetic field with a relatively smaller magnetic field strength can be formed above the magnetic sensor. When the object to be measured with the magnetic code moves along the magnetizing direction (or reverse), the magnetic code is first magnetized by the first magnetic field and then enters the second magnetic field. In this process, the magnetic sensor detects the coercive force and magnetic moment orientation of the magnetic code. Since the magnetic moment orientation of the magnetic code at least includes the direction in which the angle with the straight line where the magnetizing direction is located is an acute angle, the magnetic identification device is not limited to detecting the magnetic code perpendicular or parallel to the surface of the object to be measured, which improves the diversity of magnetic moment orientation detection and provides more codes; on the other hand, since the magnetic sensor is set between the first magnet and the second magnet, the coercive force and magnetic moment orientation of the magnetic code can be detected regardless of whether the object to be measured moves forward or backward, avoiding misdetection and facilitating use.

[0070] 2. A set of horizontal magnetization structures (two magnets) and a magnetic sensor are used to effectively detect the magnetic information of magnetic graphics, reduce costs, and facilitate product miniaturization, which is in line with the development trend of miniaturization and integration of modern electronic components.

[0071] 3. An array of multiple magnetic detection components is set as a magnetic sensor. The arrangement direction of the multiple magnetic detection components is parallel to the length direction of the long strip magnet. The sensitivity direction of each magnetic detection component can be different to measure different magnetic moment orientations to improve the detection accuracy.

[0072] 4. According to the magnetic moment orientation of the magnetic code on the object to be measured, the corresponding sensitivity direction is set respectively to realize the precise magnetic moment orientation detection for the specific object to be measured, so as to further improve the accuracy of the detection.

[0073] Example 2

[0074] This embodiment provides a test object with magnetic coding, which can refer to a security element containing magnetic material configured on a banknote, check, bank card, ticket, stamp, certificate, admission ticket or other such objects, wherein the magnetic material forms a magnetic coding. In the embodiment of the present invention, the magnetic coding includes a plurality of magnetic graphics, and the magnetic moment orientation of at least one magnetic graphic is a direction that forms an acute angle with the angle of the straight line where the magnetization direction of the above embodiment 1 is located. The magnetic moment orientation of the magnetic graphic also includes a direction perpendicular or parallel to the straight line where the magnetization direction is located.

[0075] The embodiment of the present invention sets an easy magnetization direction (ie, magnetic moment orientation) that forms an acute angle with the straight line where the magnetization direction is located, so that the magnetic code of the object to be measured in the magnetic moment orientation is easily magnetized, which is convenient for the magnetic sensor to identify.

[0076] Example 3

[0077] This embodiment provides a magnetic identification system, which is characterized by comprising: the magnetic identification device provided by the embodiment of the present invention and an object to be detected with a magnetic code.

[0078] For a detailed description, please refer to the above embodiments, which will not be repeated here.

[0079] Example 4

[0080] The embodiment of the present invention provides a magnetic code recognition method for recognizing a magnetic code having a plurality of magnetic patterns, wherein the angle between the straight line where the magnetic moment orientation of at least one magnetic pattern is located and the straight line where the magnetization direction is located is an acute angle, such as Fig.11 As shown, the magnetic coding recognition method includes:

[0081] Step S11, move the magnetic code to the first magnetic field, use the first magnetic field to magnetize the magnetic pattern, and detect the first magnetic moment orientation of each magnetic pattern, wherein the first magnetic field is an excitation magnetic field formed by arranging a first magnet and a second magnet side by side with the same magnetization direction above the first magnet or the second magnet.

[0082] Step S12, moving the magnetic code to a second magnetic field, using the second magnetic field to magnetize the magnetic pattern, and detecting the second magnetic moment orientation of each magnetic pattern, wherein the second magnetic field is an excitation magnetic field formed above a magnetic sensor arranged between the first magnet and the second magnet.

[0083] Step S13, determining the coercive force of the corresponding magnetic pattern according to the first magnetic moment orientation and the second magnetic moment orientation.

[0084] Step S14, determining magnetic encoding information corresponding to each magnetic image according to the detected first magnetic moment orientation and second magnetic moment orientation and the level of the coercive force.

[0085] In the embodiment of the present invention, the magnetic pattern on the magnetic code is first magnetized by the first magnetic field, and then enters the second magnetic field, wherein the magnetic moment orientation of the magnetic code can be identified by the magnetic sensor. Specifically, the signals collected by multiple sensor channels can be formed as follows: Figure 7a-7c The magnetic image shown in the figure can determine the magnetic moment orientation corresponding to each magnetic pattern in each stage. As for the magnitude of the coercive force, it can be determined by the change of the magnetic moment orientation before and after the first magnetic field and the second magnetic field.

[0086] Optionally, the embodiment of the present invention describes determining the coercive force of a corresponding magnetic graphic by the first magnetic moment orientation and the second magnetic moment orientation, including: when the second magnetic moment orientation is exactly the same as the first magnetic moment orientation, determining that the corresponding magnetic graphic is encoded as high coercive force; when the second magnetic moment orientation is opposite to the first magnetic moment orientation, determining that the corresponding magnetic graphic is encoded as low coercive force.

[0087] For detailed description, see Figure 5a-5e The description is not repeated here.

[0088] According to an embodiment of the present invention. The magnetic code is first magnetized in a first magnetic field formed by a first magnet and a second magnet arranged side by side in the same magnetizing direction, and then enters a second magnetic field. During this process, the magnetic sensor detects the coercive force and magnetic moment orientation of the magnetic code. Since the angle between the straight line where the magnetic moment orientation of at least one magnetic figure is located and the straight line where the magnetization direction is located is an acute angle, the magnetic identification device is not limited to detecting magnetic codes that are perpendicular or parallel to the surface of the object being measured, which improves the diversity of magnetic moment orientation detection, thereby providing more codes.

[0089] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A magnetic coding recognition method, It is characterized in that A magnetic code for identifying a plurality of magnetic patterns, wherein a straight line where the magnetic moment orientation of at least one magnetic pattern is located and a straight line where the magnetization direction is located form an acute angle, and the magnetic code identification method comprises: Move the magnetic code to a first magnetic field, use the first magnetic field to magnetize the magnetic pattern, and detect the first magnetic moment orientation of each magnetic pattern, wherein the first magnetic field is an excitation magnetic field formed by arranging a first magnet and a second magnet in the same magnetization direction and above the first magnet or the second magnet; Move the magnetic encoding to a second magnetic field, use the second magnetic field to magnetize the magnetic pattern, and detect the second magnetic moment orientation of each magnetic pattern, wherein the second magnetic field is an excitation magnetic field formed above a magnetic sensor arranged between the first magnet and the second magnet; the magnetic moment orientation of the object to be measured includes a first type of magnetic moment orientation of a magnetic encoding with a high coercive force and a second type of magnetic moment orientation of a magnetic encoding with a low coercive force; the first magnetic field can change the first type of magnetic moment orientation, and the second magnetic field cannot change the first type of magnetic moment orientation but can change the second type of magnetic moment orientation; Determining the coercive force of the corresponding magnetic pattern by the first magnetic moment orientation and the second magnetic moment orientation; The magnetic encoding information corresponding to each magnetic image is determined according to the detected first magnetic moment orientation and second magnetic moment orientation as well as the magnitude of the coercive force.

2. The magnetic coding recognition method according to claim 1, It is characterized in that The step of determining the coercive force of the corresponding magnetic pattern by the first magnetic moment orientation and the second magnetic moment orientation comprises: When the second magnetic moment orientation is completely the same as the first magnetic moment orientation, determining the corresponding magnetic pattern as high coercivity encoding; When the second magnetic moment orientation is opposite to the first magnetic moment orientation, the corresponding magnetic pattern is determined to be a low coercive force encoding.

3. An object to be measured with magnetic coding, It is characterized in that The magnetic encoding is used for identification by the method according to claim 1 or 2, the magnetic encoding includes a plurality of magnetic graphics, and the angle between the straight line where the magnetic moment orientation of at least one magnetic graphic is located and the straight line where the magnetization direction is located is an acute angle; the magnetic moment orientation of the object to be measured includes a first type of magnetic moment orientation of the magnetic encoding with high coercivity and a second type of magnetic moment orientation of the magnetic encoding with low coercivity; the first type of magnetic moment orientation can be changed by the first magnetic field but cannot be changed by the second magnetic field; The orientation of the second type of magnetic moment can be changed by a second magnetic field.

4. The object to be measured according to claim 3, It is characterized in that The magnetic pattern also includes a magnetic pattern in which the straight line where the magnetic moment orientation is located is perpendicular or parallel to the straight line where the magnetization direction is located.

5. A magnetic identification device, It is characterized in that include: a first magnet, a second magnet and a magnetic sensor, wherein The first magnet and the second magnet are arranged side by side and have the same magnetization direction, the magnetization direction is parallel to the arrangement direction, and an excitation magnetic field is formed around the first magnet and the second magnet; The magnetic sensor is arranged between the first magnet and the second magnet, and is used to detect the coercive force and magnetic moment orientation on the object to be measured; wherein the magnetic moment orientation at least includes a magnetic moment orientation in which the angle between the straight line where it is located and the straight line where the magnetization direction is located is an acute angle, the excitation magnetic field includes a first magnetic field formed above the first magnet or the second magnet and a second magnetic field formed above the magnetic sensor, and the magnetic field strength of the first magnetic field is greater than the magnetic field strength of the second magnetic field; the magnetic moment orientation of the object to be measured includes a first type of magnetic moment orientation of magnetic encoding with high coercive force and a second type of magnetic moment orientation of magnetic encoding with low coercive force; the first magnetic field can change the first type of magnetic moment orientation, and the second magnetic field cannot change the first type of magnetic moment orientation but can change the second type of magnetic moment orientation.

6. The magnetic identification device according to claim 5, It is characterized in that The first magnet or the second magnet is a permanent magnet or a soft magnet.

7. The magnetic identification device according to claim 5, It is characterized in that The first magnet and the second magnet are long strip magnets of the same size, and the arrangement direction is perpendicular to the length direction of the long strip magnets.

8. The magnetic identification device according to claim 7, It is characterized in that The magnetic sensor is an array composed of a plurality of magnetic detection components, and the arrangement direction of the plurality of magnetic detection components is parallel to the length direction of the long strip magnet.

9. The magnetic identification device according to claim 8, It is characterized in that The magnetic detection component is a single magnetoresistance, a magnetoresistance half bridge, or a magnetoresistance full bridge.

10. The magnetic identification device according to claim 8, It is characterized in that The sensitivity direction of the magnetic detection component includes at least one of the following: a direction parallel to the arrangement direction, a direction perpendicular to the surface of the object to be measured, and a direction parallel to the surface of the object to be measured and perpendicular to the arrangement direction.

11. A magnetic identification system, It is characterized in that include: The object to be measured with magnetic coding as described in claim 3 or 4 and the magnetic identification device as described in any one of claims 5-10.

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