CN213935041U - Measured object with magnetic coding, magnetic identification device and system - Google Patents

Abstract

The utility model discloses a measured object, magnetism recognition device and system with magnetic encoding, magnetic encoding includes a plurality of magnetic patterns, and the magnetic moment orientation place sharp of at least one magnetic pattern becomes the acute angle with the contained angle of the sharp of direction place of magnetizing. The utility model discloses a measured object with magnetic encoding makes magnetic identification device not confine to the magnetic encoding that detects perpendicularly or be on a parallel with the measured object surface, has improved magnetic moment orientation and has detected the variety, provides more coding numbers.

Description

Measured object with magnetic coding, magnetic identification device and system

Technical Field

The utility model relates to a magnetic encoding technical field, concretely relates to measured object, magnetism recognition device and system with magnetic encoding.

Background

In everyday life, documents of value, such as banknotes, cheques, bank cards, tickets, stamps, certificates, tickets or other such articles, are provided with security elements comprising magnetic material for protection against forgery or security, such as a length of magnetic media strip (security thread) in a banknote.

In the prior art, the security element generally uses magnetic materials with different coercivity sizes for magnetic encoding, for example, two magnetic regions are formed by using two magnetic materials with different coercivity sizes, 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 adopts the mixed magnetic encoding of the coercive force of the magnetic material and the magnetic moment orientation, and for the identification and detection of the mixed magnetic encoding, the coercive force of the magnetic material and the magnetic moment orientation need to be distinguished at the same time to judge the authenticity of the security element. However, in the prior art, as disclosed in the published chinese patent: a magnetic sensor (Chinese patent publication No. CN102272613A) and a valuable paper processing method and apparatus (Chinese patent publication No. CN102576477A) for checking a counterfeit bill, which can realize discrimination of a coercive force of a magnetic material high or low but cannot simultaneously realize judgment of magnetic moment orientation.

In the above-mentioned published chinese patent, to distinguish the coercive force of the magnetic material of the security element, the security element is magnetized by the magnetizing device, and then the magnetized security element is away from the magnetizing field, and then the remanence of the security element containing the magnetic material is detected by the magnetic sensor. In the schemes, two groups of magnetizing devices and two groups of magnetic sensors are generally needed, namely, the detection of the safety element adopts two times of scanning, the results of the two times of scanning are different, and the results of the two times of scanning are processed to obtain the correction information of the magnetic material of the safety element, namely the judgment of the coercive force.

Technical solutions for identifying the magnetic moment orientation also exist in the prior art, such as the published chinese patents: the magnetic moment orientation device for identifying the magnetic patterns on the magnetic strip and the identification method thereof (Chinese patent publication No. CN 103268658A) can realize the judgment of the magnetic moment orientation and the coercive force of the magnetic material, but can only distinguish the magnetic moment orientations which are vertical to a bill plane and parallel to the bill plane, so that the magnetic moment orientations which can be identified are relatively single. In addition, in the scheme, the measured object can only move along one direction to carry out magnetic coding identification, so that the magnetic coding identification device is inconvenient to use.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model discloses solve the problem that the magnetic moment orientation that can discern among the prior art is more single and not convenient for use to a measured object, magnetism recognition device and system with magnetic encoding are provided.

The utility model discloses the first aspect of embodiment provides a measured object with magnetic encoding, magnetic encoding includes a plurality of magnetic patterns, and the magnetic moment orientation place straight line of at least one magnetic pattern becomes the acute angle with the contained angle of the sharp at direction of magnetizing place.

Optionally, the magnetic patterns further include magnetic patterns in which a straight line in which the magnetic moments are oriented is perpendicular to or parallel to a straight line in which the magnetization direction is located.

The embodiment of the utility model provides a on the other hand provides a magnetic identification device, include: the magnetic sensor comprises 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 magnetizing direction, the magnetizing 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 used for detecting the coercive force and the magnetic moment orientation on a measured object; the magnetic moment orientation at least comprises a magnetic moment orientation with an acute angle formed by an included angle between a straight line and a magnetizing direction straight line, the exciting magnetic field comprises 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 intensity of the first magnetic field is greater than that of the second magnetic field.

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

Optionally, the first magnet and the second magnet are strip magnets with the same size, and the arrangement direction is perpendicular to the length direction of the strip magnets.

Optionally, the magnetic sensor is an array formed by 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.

Optionally, the magnetic detection component is a single magnetic resistor or a magnetoresistive half-bridge or a magnetoresistive full-bridge.

Optionally, the magnetic detection component sensitivity direction comprises at least one of: a direction parallel to the alignment direction, a direction perpendicular to the surface of the object to be measured, a direction parallel to the object to be measured and perpendicular to the alignment direction.

Optionally, the magnetic moment orientations of the measured object include a high coercivity magnetically encoded first type of magnetic moment orientation and a low coercivity magnetically encoded second type of magnetic moment orientation; the first magnetic field is capable of changing the first type of magnetic moment orientation, and the second magnetic field is incapable of changing the first type of magnetic moment orientation but capable of changing the second type of magnetic moment orientation.

The embodiment of the utility model provides a further aspect provides a magnetic identification system, include: the magnetic identification device and the object to be measured with magnetic encoding.

The utility model discloses following technological effect can be reached:

1. the embodiment of the utility model provides a through earlier with the magnetism encoding in the direction of magnetizing the magnetism the same and set up the first magnetic field magnetization that first magnet side by side and second magnet formed, then reentrant second magnetic field, at this in-process, magnetic sensor detects the coercivity size and the magnetic moment orientation of magnetism encoding. Because the magnetic moment orientation of the magnetic coding at least comprises the magnetic moment orientation of which the included angle between the straight line and the magnetizing direction forms an acute angle, the magnetic identification device is not limited to detecting the magnetic coding vertical to or parallel to the surface of the measured object, the magnetic moment orientation detection diversity is improved, and more coding numbers are provided.

2. The magnetic sensor is arranged between the first magnet and the second magnet through the first magnet and the second magnet which are arranged side by side and have the same magnetizing directions, so that a magnetic field with larger magnetic field intensity can be formed above the first magnet or the second magnet and a magnetic field with relatively smaller magnetic field intensity can be formed above the magnetic sensor, when a measured object with a magnetic code moves along the magnetizing direction (or in the reverse direction), the magnetic code is firstly magnetized by the first magnetic field and then enters the second magnetic field, and in the process, the magnetic sensor detects the coercive force and the magnetic moment orientation of the magnetic code. Because the magnetic moment orientation of the magnetic code at least comprises the magnetic moment orientation of which the included angle between the straight line and the magnetizing direction forms an acute angle, the magnetic identification device is not limited to detecting the magnetic code vertical to or parallel to the surface of the measured object, the detection diversity of the magnetic moment orientation is improved, and more code numbers are provided; on the other hand, because magnetic sensor sets up between first magnet and second magnet for no matter the measured object is forward movement or reverse movement, all can realize the detection of magnetic encoding coercive force and magnetic moment orientation, avoid producing the misprediction, facilitate the use.

3. By adopting a group of horizontal magnetization structures (two magnets) and a magnetic sensor, the cost is reduced under the condition of realizing effective detection of magnetic information of a magnetic pattern, the miniaturization of a product is facilitated, and the development trend of miniaturization and integration of modern electronic components is met.

4. The array formed by the plurality of magnetic detection components is used as a magnetic sensor, the arrangement direction of the plurality of magnetic detection components is parallel to the length direction of the strip-shaped magnet, and the sensitivity direction of each magnetic detection component can be different and is used for measuring different magnetic moment orientations so as to improve the detection accuracy.

5. According to the magnetic moment orientation of the magnetic codes on the measured object, corresponding sensitivity directions are respectively set, so that accurate magnetic moment orientation detection aiming at the specific measured object is realized, and the detection accuracy is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of a magnetic recognition device according to an embodiment of the present invention;

fig. 2 is a view of a magnetic identification device according to an embodiment of the present invention in the xz plane;

fig. 3 is a schematic view of the magnetic field distribution of the magnetic identification device in the xz plane according to the embodiment of the present invention;

fig. 4 is a schematic view of the magnetic field distribution of the magnetic identification device in the x component according to the embodiment of the present invention;

fig. 5a is a schematic diagram of an exemplary magnetically encoded easy magnetization direction of the present invention;

fig. 5b is a schematic diagram of the magnetic moment orientation of the magnetic encoding after magnetization by the first magnetic field in the embodiment of the present invention;

fig. 5c is a schematic diagram of the magnetic moment orientation of a high coercivity magnetic encoding passing through a first magnetic field and a second magnetic field in an embodiment of the invention;

fig. 5d is a schematic diagram of the magnetic moment orientation of the low coercivity magnetic encoding through the first and second magnetic fields in an embodiment of the invention;

fig. 5e is a schematic diagram of the magnetic moment orientation type of the magnetic encoding in the embodiment of the present invention;

fig. 6 is a view of the xy plane of a magnetic identification device according to an embodiment of the present invention;

fig. 7a is a magnetic image of the x-component of the magnetic field according to an embodiment of the present invention;

fig. 7b is a magnetic image of the y-component of the magnetic field according to an embodiment of the present invention;

fig. 7c is a magnetic image of a z-component of a magnetic field according to an embodiment of the present invention;

fig. 8 is a schematic diagram illustrating the distribution of z-component of the magnetic field according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of the magnetic encoding of the present invention after magnetization by the magnetic field shown in FIG. 8;

FIG. 10 is a magnetic image of the x, y, and z components of a magnetic field according to an embodiment of the present invention;

fig. 11 is a flowchart of a magnetic encoding identification method according to an embodiment of the present invention.

Reference numerals:

1-a first magnet; 2-a second magnet;

3-magnetic sensor.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The embodiment of the utility model provides a magnetism recognition device for coercivity and magnetic moment orientation on the measured object that the discernment has the magnetic encoding. As shown in fig. 1, the magnetic recognition apparatus includes: the magnetic sensor comprises 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 magnetizing direction, the magnetizing direction is parallel to the arrangement direction, and an exciting 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 may be both permanent magnets or both soft magnets, or one of the permanent magnets and the other soft magnet. The permanent magnet can be made of neodymium iron boron, samarium cobalt or hard magnetic ferrite; the soft magnet is made of silicon steel sheet, permalloy or soft magnetic ferrite, and can also be realized by a coil or the coil and the soft magnetic material.

In an optional implementation manner of the embodiment of the present invention, the first magnet 1 and the second magnet 2 may be strip-shaped magnets having the same size, and the arrangement direction is perpendicular to the length direction of the strip-shaped magnets.

For convenience of description, the embodiment of the present invention takes the strip-shaped magnet as an example, and establishes a coordinate system in the space where the magnetic identification device is located, as shown in fig. 1, the first magnet and the second magnet are arranged along the x-axis direction on the xy plane, and the magnetizing direction is the positive direction of the x-axis (of course, the magnetizing direction may also be the negative direction of the x-axis). The first magnet and the second magnet are disposed along the y-axis direction. A view of the xz plane is shown in fig. 2.

The magnetic sensor device 3 is arranged between the first magnet 1 and the second magnet 2 and used for detecting the coercive force and the magnetic moment orientation on a measured object; the magnetic moment orientation at least comprises an acute angle formed by an included angle between a straight line where the magnetic moment orientation is located and a straight line where the magnetizing direction is located, the exciting magnetic field comprises 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, the magnetic field strength of the first magnetic field is larger than that of the second magnetic field, and the specific magnetic field distribution is shown in fig. 3 and 4. The embodiment of the utility model provides an in, magnetic moment orientation place straight line and magnetization direction place straight line acutangulate can indicate that magnetic moment orientation and the positive direction of x axle become acute angle or obtuse angle, for example, 45 or 135 etc..

The embodiment of the utility model provides an in, coercivity's detection mainly is that the magnetic material who detects through testing result judgement magnetic coding is high coercivity or low coercivity, and high coercivity and low coercivity are relative coercivity size, and the value of specific coercivity can set up as required. The embodiment of the utility model provides an in the magnetic moment orientation of measured object include the magnetic encoding's of high coercivity first kind magnetic moment orientation and the magnetic encoding's of low coercivity second kind magnetic moment orientation; the first magnetic field is capable of changing the first type of magnetic moment orientation, and the second magnetic field is incapable of changing the first type of magnetic moment orientation but capable of changing the second type of magnetic moment orientation. The first magnetic field and the second magnetic field are respectively magnetic fields generated by the first magnet and the second magnet around the measured object, the positions of the first magnetic field and the second magnetic field can be realized through the structural arrangement of the magnetic identification device, and specifically, the required magnetic field distribution effect can be achieved by adjusting the x-direction and z-direction sizes of the first magnet and the second magnet, the distance between the two magnets and the height (z-direction distance) between the whole device and the measured object. In order to achieve the preset effect, the sizes need to be optimized, and the optimization result can be obtained through simulation and actual measurement.

The embodiment of the utility model provides an in, first type magnetic moment orientation and second type magnetic moment orientation are classified according to the coercive force size of magnetic encoding, and the orientation of the magnetic moment orientation in the different classes can be the same, also can be different.

Due to different magnetic moment orientations, under the excitation of an external magnetic field, the magnetic material is easily magnetized by the external magnetic field parallel to the easy magnetization direction; and an external magnetic field perpendicular to the easy magnetization direction does not easily magnetize the magnetic material. The magnitude of the coercivity determines the magnitude of the external magnetic field required to change its magnetization direction. A magnetic material having a high coercive force, which is not easily changed in magnetization direction by an external magnetic field after being magnetized; a magnetic material having a low coercive force is relatively easily changed in magnetization direction by an external magnetic field after being magnetized. The magnetization direction is parallel to the magnetization direction, the magnetization direction is the final presentation result of the magnetization direction, when the magnetization direction is changed, the magnetization direction is opposite to the original magnetization direction, and otherwise, the magnetization direction and the original magnetization direction are in the same direction. The embodiment of the utility model provides an in, through setting up the easy magnetization direction (also be the magnetic moment orientation) that becomes the acute angle with the direction of magnetizing, because the relative position relation of first magnetic field and second magnetic field and measured object when the measured object removes for every magnetism figure direction is magnetized respectively, makes things convenient for magnetic sensor to discern.

For a clearer description of the embodiments of the present application, three easy magnetization directions are used for illustration, and specifically, the easy magnetization directions are divided into: the direction of movement (x-axis direction) is at a positive or negative angle to the direction of movement (x-axis direction) as shown in fig. 5 a. Preferably, the angles between the easy magnetization direction and the traveling direction (x-axis direction) are ± 45 ° respectively.

When the magnetic encoding passes over the first magnet, the first magnetic field (which may be referred to as the front excitation field) orients the magnetically encoded magnetic moment into three states, as shown in FIG. 5 b.

The second magnetic field (which may be referred to as the in-situ excitation field) produces a different effect on the high coercivity magnetic encoding and the low coercivity magnetic encoding when the magnetic encoding passes over the air gap between the first magnet and the second magnet (i.e., over the magnetic sensor).

When the magnetic encoding is a high coercivity magnetic encoding, the second magnetic field is insufficient to change the magnetic moment orientation and the magnetically encoded magnetization state changes little (or substantially no) as shown in FIG. 5 c.

When the magnetic encoding is a low coercivity magnetic encoding, the second magnetic field reverses the magnetic moment orientation, as shown in FIG. 5 d.

Thus, 3 easy magnetization directions for the magnetic encoding, in combination with the high coercivity, low coercivity material, there are 6 states for the magnetic encoding to pass over the magnetic sensor, as shown in FIG. 5 e.

In order to detect the magnetic moment orientation of different magnetic codes more accurately, the embodiment of the present invention provides that the magnetic sensor is an array formed by a plurality of magnetic detection components, the arrangement direction of the plurality of magnetic detection components is parallel to the length direction of the elongated magnet, and the length direction mentioned here may refer to the y-axis direction, as shown in fig. 6. Each magnetic sensing means may be a single magnetoresistive or a magnetoresistive half-bridge or a magnetoresistive full-bridge. The sensitivity directions of the magnetic detection components can be different for measuring different magnetic moment orientations to improve detection accuracy.

Of course, in order to increase the universality of the magnetic identification device, the sensitivity direction of the magnetic detection component according to the embodiment of the present invention includes at least one of the following: a direction parallel to the arrangement direction (i.e., x-axis direction), a direction perpendicular to the arrangement direction and parallel to a direction (z-axis direction) directed toward the object to be measured, and a direction perpendicular to the arrangement direction and parallel to the elongated magnet length direction (y-axis direction). The embodiment of the utility model provides an in, can adopt the magnetism detection part of above-mentioned three kinds of directions to can detect the magnetic moment orientation of different angles. Of course, in order to further improve the detection accuracy, corresponding sensitivity directions can be set according to the magnetic moment orientations of the magnetic codes on the measured object, so that the accurate magnetic moment orientation detection for the specific measured object is realized.

The embodiment of the utility model provides an in, adopt a plurality of magnetism to detect the part and constitute the array, utilize a plurality of magnetism to detect the signal that the part gathered the multichannel, just can detect the magnetic image of magnetic encoding. The magnetic images with the 6 magnetic moment orientations are shown in fig. 7a, 7b, and 7c depending on the detected magnetic field component. According to the 6 different magnetic images, different easy magnetization directions and high and low coercive forces can be encoded, for example, 3 easy magnetization directions are encoded into A, B, C, and high and low coercive forces are encoded into 0 and 1.

When the distribution of the z component of the magnetic field on the upper surface of the magnet is as shown in fig. 8, the magnetic moment of the magnetic code changes as shown in fig. 9 when the magnetic code whose easy magnetization direction is the z direction is excited by the magnetic field in the z direction. When it is moved over the sensor, the detected magnetic image is shown in fig. 10 for different detected magnetic field components. The magnetic images of different magnetic field components are different from the magnetic coded image of the easy magnetization direction in the xy plane, so that the magnetic identification sensor can also identify the magnetic code of which the easy magnetization direction is the z direction.

According to the utility model discloses, can derive, the utility model discloses can reach following technological effect:

1. the magnetic sensor is arranged between the first magnet and the second magnet through the first magnet and the second magnet which are arranged side by side and have the same magnetizing directions, so that a magnetic field with larger magnetic field intensity can be formed above the first magnet or the second magnet and a magnetic field with relatively smaller magnetic field intensity can be formed above the magnetic sensor, when a measured object with a magnetic code moves along the magnetizing direction (or in the reverse direction), the magnetic code is firstly magnetized by the first magnetic field and then enters the second magnetic field, and in the process, the magnetic sensor detects the coercive force and the magnetic moment orientation of the magnetic code. Because the magnetic moment orientation of the magnetic code at least comprises the direction with an acute included angle with the straight line of the magnetizing direction, the magnetic identification device is not limited to detect the magnetic code vertical to or parallel to the surface of the measured object, the magnetic moment orientation detection diversity is improved, and more code numbers are provided; on the other hand, because magnetic sensor sets up between first magnet and second magnet for no matter the measured object is forward movement or reverse movement, all can realize the detection of magnetic encoding coercive force and magnetic moment orientation, avoid producing the misprediction, facilitate the use.

2. By adopting a group of horizontal magnetization structures (two magnets) and a magnetic sensor, the cost is reduced under the condition of realizing effective detection of magnetic information of a magnetic pattern, the miniaturization of a product is facilitated, and the development trend of miniaturization and integration of modern electronic components is met.

3. The array formed by the plurality of magnetic detection components is used as a magnetic sensor, the arrangement direction of the plurality of magnetic detection components is parallel to the length direction of the strip-shaped magnet, and the sensitivity direction of each magnetic detection component can be different and is used for measuring different magnetic moment orientations so as to improve the detection accuracy.

4. According to the magnetic moment orientation of the magnetic codes on the measured object, corresponding sensitivity directions are respectively set, so that accurate magnetic moment orientation detection aiming at the specific measured object is realized, and the detection accuracy is further improved.

Example 2

The present embodiment provides a test object with a magnetic code, which may be a security element comprising magnetic material arranged on an object such as a banknote, cheque, bank card, ticket, stamp, document, ticket or other such object, wherein the magnetic material forms the magnetic code. In the embodiment of the utility model, the magnetic encoding includes a plurality of magnetism figures, and the magnetic moment orientation of at least one magnetism figure is the direction that becomes the acute angle with the contained angle of above-mentioned embodiment 1 direction place straight line that magnetizes. The magnetic moment orientation of the magnetic pattern also comprises a direction perpendicular or parallel to the line of the magnetizing direction.

The embodiment of the utility model provides a through setting up and magnetizing the easy magnetization direction (also be the magnetic moment orientation) that the direction place straight line becomes the acute angle for the magnetic encoding of measured object at this magnetic moment orientation is easily magnetized, makes things convenient for magnetic sensor to discern.

Example 3

The present embodiment provides a magnetic identification system, comprising: the embodiment of the utility model provides a magnetism recognition device and measured object that has the magnetic encoding.

For specific description, reference may be made to the above embodiments, which are not described herein in detail.

Example 4

The embodiment of the utility model provides a magnetic encoding identification method for the identification has the magnetic encoding of a plurality of magnetic patterns, wherein, the magnetic moment orientation place straight line of at least one magnetic pattern becomes the acute angle with the contained angle of the sharp at magnetization direction place, as shown in figure 11, magnetic encoding identification method includes:

step S11, moving the magnetic code to a first magnetic field, performing magnetization processing on the magnetic patterns by using the first magnetic field, and detecting a first magnetic moment orientation of each magnetic pattern, where the first magnetic field is an excitation magnetic field formed by arranging a first magnet and a second magnet above the first magnet or the second magnet in parallel with the same magnetization direction.

Step S12, moving the magnetic code to a second magnetic field, performing magnetization processing on the magnetic patterns by using the second magnetic field, and detecting a second magnetic moment orientation of each magnetic pattern, wherein the second magnetic field is an excitation magnetic field formed above a magnetic sensor disposed between the first magnet and the second magnet.

And step S13, determining the coercive force of the corresponding magnetic pattern through the first magnetic moment orientation and the second magnetic moment orientation.

And step S14, determining magnetic encoding information corresponding to each magnetic image according to the detected first magnetic moment orientation, the detected second magnetic moment orientation and the detected coercive force.

The embodiment of the utility model provides an in, utilize first magnetic field to magnetize the magnetism figure on the magnetic encoding earlier, then in the second magnetic field that reentries into, wherein the magnetic moment orientation of magnetic encoding can utilize magnetic sensor to discern, specifically, can utilize the signal formation that a plurality of sensor channels gathered as the magnetic image that figure 7a-7c is shown to determine the magnetic moment orientation that every magnetism figure at every stage corresponds. As for the magnitude of the coercive force, it can be determined using the change in the orientation of the magnetic moment before and after passing through the first magnetic field and the second magnetic field.

Optionally, in the embodiment of the present invention, the first magnetic moment orientation and the second magnetic moment orientation determine the coercivity of the corresponding magnetic pattern, including: when the second magnetic moment orientation is completely the same as the first magnetic moment orientation, determining that the corresponding magnetic pattern is a high coercivity code; and when the orientation of the second magnetic moment is opposite to the orientation of the first magnetic moment, determining that the corresponding magnetic pattern is a low-coercivity code.

For a detailed description, refer to the description of fig. 5a-5e, which are not repeated herein.

According to the embodiment of the utility model provides a. The magnetic encoding is magnetized in a first magnetic field formed by a first magnet and a second magnet which are arranged side by side and have the same magnetizing direction, and then the first magnetic field enters a second magnetic field, and in the process, the magnetic sensor detects the coercive force and the magnetic moment orientation of the magnetic encoding. Because the included angle between the straight line of the magnetic moment orientation of at least one magnetic pattern and the straight line of the magnetizing direction forms an acute angle, the magnetic identification device is not limited to detecting the magnetic codes vertical to or parallel to the surface of the measured object, the magnetic moment orientation detection diversity is improved, and more coding numbers are provided.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. The measured object with the magnetic codes is characterized in that the magnetic codes comprise a plurality of magnetic patterns, and an included angle formed by a straight line where the magnetic moment orientation of at least one magnetic pattern is located and a straight line where the magnetizing direction is located is an acute angle.

2. The object to be measured according to claim 1, wherein the magnetic pattern further comprises a magnetic pattern in which a line along which the magnetic moments are oriented is perpendicular or parallel to a line along which the magnetization direction is oriented.

3. A magnetic identification device, 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 magnetizing direction, the magnetizing direction is parallel to the arrangement direction, and an exciting 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 used for detecting the coercive force and the magnetic moment orientation on a measured object; the magnetic moment orientation at least comprises a magnetic moment orientation with an acute angle formed by an included angle between a straight line and a magnetizing direction straight line, the exciting magnetic field comprises 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 intensity of the first magnetic field is greater than that of the second magnetic field.

4. A magnetic identification device according to claim 3 wherein the first or second magnet is a permanent or soft magnet.

5. The magnetic identification device according to claim 3, wherein the first magnet and the second magnet are elongated magnets having the same size, and the arrangement direction is perpendicular to the length direction of the elongated magnets.

6. The magnetic identification device according to claim 5, wherein the magnetic sensor is an array of a plurality of magnetic detection members, and the arrangement direction of the plurality of magnetic detection members is parallel to the longitudinal direction of the elongated magnet.

7. The magnetic identification device according to claim 6, wherein the magnetic detection means is a single magnetic resistor or a magnetoresistive half-bridge or a magnetoresistive full-bridge.

8. The magnetic identification device according to claim 7, wherein the magnetic detection component sensitivity direction comprises at least one of: a direction parallel to the alignment direction, a direction perpendicular to the surface of the object to be measured, a direction parallel to the object to be measured and perpendicular to the alignment direction.

9. The magnetic identification device of claim 3, wherein the magnetic moment orientation of the measured object comprises a high coercivity magnetically encoded first type of magnetic moment orientation and a low coercivity magnetically encoded second type of magnetic moment orientation; the first magnetic field is capable of changing the first type of magnetic moment orientation, and the second magnetic field is incapable of changing the first type of magnetic moment orientation but capable of changing the second type of magnetic moment orientation.

10. A magnetic identification system, comprising: an object to be tested having a magnetic code according to claim 1 or 2 and a magnetic identification device according to any of claims 3 to 9.

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