CN103456072B - A kind of sensor for identifying magnetic medium - Google Patents
A kind of sensor for identifying magnetic medium Download PDFInfo
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- CN103456072B CN103456072B CN201310380197.1A CN201310380197A CN103456072B CN 103456072 B CN103456072 B CN 103456072B CN 201310380197 A CN201310380197 A CN 201310380197A CN 103456072 B CN103456072 B CN 103456072B
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- 230000005284 excitation Effects 0.000 claims abstract description 21
- 230000006698 induction Effects 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 239000003082 abrasive agent Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 230000005415 magnetization Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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Abstract
The invention discloses a kind of sensor for identifying magnetic medium, including excitation and two sensing units, the magnetic field induction direction of said two sensing unit is mutually perpendicular to.Described sensor is applicable to identify magnetic medium.The sensing unit of described sensor uses magnetic sensor elements, can be Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or magnetic tunnel junction element.Magnetic sensor elements is suitable for producing in enormous quantities, and processing technology is simpler and ripe, and yield rate is high, and the processing technique of the most described sensor is relatively simple, and cost is relatively low.The field intensity in two leakage field directions of magnetic medium can be measured due to described sensor, therefore can distinguish more accurately, detect magnetic medium, improve false proof and secret grade.
Description
Technical field
The present invention relates to magnetic sensor technologies field, be used for identifying magnetic medium such as magnetic secret paper, bank note, the sensor of the magnetic such as check and magnetic card particularly to one.
Background technology
In daily life, the use of magnetic medium widely, is applied to all kinds of false proof and encryption, the most various magnetic secret papers, bank note, check, magnetic card etc..It is the true and false identifying its magnetic signal by measuring the stray field component of single direction of magnetic medium that existing magnetic sensor reads the generic way of magnetic medium signal.But for forging magnetic card, for the lawless person of bank note etc., copy out the magnetic card identical with the stray field component of raw magnetic medium single direction or bank note is easier comparatively speaking, its technological means relative maturity, copy relative inexpensiveness.The most universal sensor is only just not enough to judge the true and false of magnetic card or bank note with the single stray field component identifying medium.The present invention is a kind of sensor for identifying two leakage field directions of magnetic medium, and it can be distinguished more accurately, detects magnetic medium, improves false proof and secret grade.
Summary of the invention
Present invention aim at the upgrading for existing magnetic sensor and a kind of sensor that can identify two leakage field directions of magnetic medium is provided.
The present invention for achieving the above object, adopts the following technical scheme that
A kind of sensor for identifying magnetic medium, including excitation and two sensing units, it is characterised in that: the magnetic field induction direction of said two sensing unit is mutually perpendicular to.
Preferred: each unit of two sensing units is by printed substrate, magnetic sensor elements, corresponding circuit and draws pin and forms, draw pin by output and be connected output signal with peripheral circuit, the printed substrate of said two sensing unit is used alone or shares, and the distance of said two sensing unit induction zone distance magnetic medium is less than 2 millimeters.
Preferred: each unit of said two sensing unit can be by magnetic sensor elements, package casing and draw pin and form, described magnetic sensor elements comprises integrated circuit, drawing pin by output and be connected output signal with peripheral circuit, the distance of said two sensing unit induction zone distance magnetic medium is less than 2 millimeters.
Its magnetic sensor elements being further characterized by said two sensing unit can be the magnetic sensor elements such as Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or magnetic tunnel junction element.
Preferred: the described single sensing unit for identifying magnetic medium can include one or more magnetic sensor elements, and the magnetic field induction direction of the multiple magnetic sensor elements in a sensing unit is parallel to each other.
Preferred: the magnetic sensor elements in said two sensing unit can be single resistance, half-bridge or full bridge structure.
Further: described excitation is permanent magnet or electric magnet, its effective exciting field width is more than or equal to the sensing width of magnetic field sensing cell, and excitation is positioned at the side of two magnetic transducing unit.
Preferred: said two sensing unit and excitation are fixed by skeleton, described excitation can share a skeleton with said two sensing unit, or is placed on outside skeleton.
The material of described skeleton is non magnetic high-abrasive material.
The present invention can measure the field intensity in two leakage field directions of magnetic medium, has higher precision than general class magnetic head sensor, such that it is able to improve anti-fake encrpted grade.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the sensor for identifying magnetic medium that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the summary of the invention of the present invention is further described by embodiment.
The sensor of existing identification magnetic medium is only capable of measuring the field intensity of one direction stray field of magnetic medium.
Embodiments of the invention are as shown in Figure 1, what the present embodiment provided is used for identifying that the sensor of magnetic medium includes sensing unit 11, sensing unit 12, excitation 13, described sensing unit 11 and sensing unit 12 include that magnetic sensor elements and circuit, the magnetic field induction direction 1 of described sensing unit 11 and the magnetic field induction direction 2 of sensing unit 12 are mutually perpendicular to.Excitation 13 can provide exciting field 21 for magnetized medium, can be permanent magnet can also be electric magnet, the width of its effective exciting field 21 is more than or equal to the sensing width of sensing unit, exciting field 21 can be any direction, this direction can adjust according to the shape of excitation 13, if excitation 13 is permanent magnet, the big I of its field intensity determines according to its material, if electric magnet, can be determined by the size of current controlling to pass through.
Described sensing unit 11 and sensing unit 12 can be by printed substrate, magnetic sensor elements, corresponding circuit and draw pin and form, its input and outfan weld with the respective terminal of printed substrate respectively, draw pin 14 by output and be connected output signal with peripheral circuit, the printed substrate of described sensing unit 11 and sensing unit 12 can share, can also be two printed substrates, during work, the distance of the induction zone distance magnetic medium of the magnetic sensor elements in two sensing units be less than 2 millimeters.
Described sensor can also be integrated structure, sensing unit 11 and sensing unit 12 are integrated form chip, by magnetic sensor elements, package casing and draw pin and form, wherein magnetic sensor elements includes integrated circuit, drawing pin 14 by output to be connected with peripheral circuit, during work, the distance of the distance of the induction zone in two sensing units magnetic medium is less than 2 millimeters.
Sensor described in the present embodiment has skeleton and metal shell 15, and the material of described skeleton and metal shell 15 is non magnetic wear-resistant material.Described excitation 13 can share a skeleton with said two sensing unit, it is also possible to is placed on outside skeleton.Described skeleton is a kind of special-shaped structural part, in the accompanying drawings and be not drawn into, its shape and size match with sensing unit 11, sensing unit 12, excitation (if excitation and sensing unit share a skeleton), and the inner surface of its outward flange and metal shell 15 is in close contact, in order to fixing sensing unit 11, sensing unit 12, printed substrate and excitation 13.Meanwhile, described skeleton and metal shell 15 are additionally provided with through hole, and the positions and dimensions that the positions and dimensions of this through hole draws pin 14 with output respectively is mated so that pin 14 is drawn in output can be through the through hole of skeleton.Meanwhile, in skeleton is housed it by described metal shell 15 and by fixing, the one end open of metal shell 15, one end relative with this opening is detection faces.Meanwhile, metal shell 15 is provided with grounding lead pin 16, for shielding electromagnetic interference in addition to described sensor, and is used for eliminating electrostatic.
Sensing unit 11 and the magnetic sensor elements of sensing unit 12 in the present embodiment use magnetic sensor elements, such as Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or magnetic tunnel junction element.The magnetic sensor elements of sensing unit 11 and sensing unit 12 can be single resistance, can be half-bridge, it is also possible to be full-bridge sensing unit 11 and sensing unit 12 comprises one or more magnetic sensor elements.The magnetic field induction direction 1,2 of sensing unit 11 and sensing unit 12 is mutually perpendicular to.
As it is shown in figure 1, magnetizing mediums bar 22 first passes through excitation 13 during work, after the media particle 23 of magnetizing mediums bar 22 is magnetized by exciting field 21, the stray field 25 of media particle 23 is measured by sensing unit 11 and sensing unit 12 again.The lower section of Fig. 1 is the top view that after magnetizing mediums bar 22 is excited 13 magnetization, magnetic moment 24 state of media particle 23 changes, if medium is soft magnetic materials, then magnetic moment 24 direction of media particle 23 is identical with the direction of exciting field 21, if medium is hard magnetic material, then the vector of the magnetic moment 24 of media particle 23 is identical with the direction of exciting field 21.When working sensor, scribble the magnetizing mediums bar 21 of media particle 23 after being excited 13 magnetization at sensing unit 11 and the moved beneath of sensing unit 12, the distance of the induction zone distance magnetic medium of the magnetic sensor elements in two sensing units is less than 2 millimeters, now sensing unit 11 and sensing unit 12 can measure the stray field 25 of magnetic moment 24 of media particle quantitatively along its magnetic field induction direction 1, the size of stray field 25 component on 2 directions, output signal is drawn pin 14 by output and is delivered to peripheral circuit, and then the state of the stray field 25 of media particle 23 is calculated by the micro treatmenting device of peripheral circuit.
The present invention program can also detect multichannel magnetic medium signal.Sensing unit 11 and sensing unit 12 comprise multiple magnetic sensor elements, multichannel magnetic medium bar is after an elongated excitation magnetization, orthogonal two the adjacent magnetic sensor elements in magnetic field induction direction are one group and measure a road magnetic medium signal, and its output signal carries out processing to calculate the stray field state of multichannel magnetic medium by the micro treatmenting device of peripheral circuit.
The sensing unit 11 of described sensor and the sensing element of sensing unit 12 can use Hall element, AMR element, GMR element or MTJ element can also be used, if using other elements in addition to Hall element, then there is higher sensitivity, preferably temperature characterisitic and resistance to stress ability, higher signal to noise ratio.Owing to described sensor can measure the field intensity in two leakage field directions of magnetic medium, the sensor of its certainty of measurement prior art to be significantly larger than, such that it is able to improve anti-fake encrpted grade.
Should be appreciated that above is illustrative and not restrictive by preferred embodiment to the detailed description that technical scheme is carried out.Technical scheme described in each embodiment can be modified on the basis of reading description of the invention by those of ordinary skill in the art, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (4)
1. for identifying a sensor for magnetic medium, including excitation and two sensing units, it is characterised in that: two sensing units of described sensor comprise magnetic sensor elements, and the magnetic field induction direction of two sensing units is mutually perpendicular to simultaneously；
The single sensing unit of said two sensing unit includes that pin is drawn in printed substrate, magnetic sensor elements, corresponding circuit and output, draw pin by output and be connected output signal with peripheral circuit, the printed substrate of said two sensing unit is used alone or shares, and the distance of said two sensing unit induction zone distance magnetic medium is less than 2 millimeters；
Or, the single sensing unit of said two sensing unit includes that pin is drawn in magnetic sensor elements, package casing and output, described magnetic sensor elements comprises integrated circuit, drawing pin by output and be connected output signal with peripheral circuit, the distance of said two sensing unit induction zone distance magnetic medium is less than 2 millimeters；
The magnetic sensor elements of said two sensing unit is the magnetic sensor elements including giant magnetoresistance element or magnetic tunnel junction element；
For identifying that the single sensing unit of magnetic medium includes multiple magnetic sensor elements, and the magnetic field induction direction of the multiple magnetic sensor elements in single sensing unit is parallel to each other；
Magnetic sensor elements in said two sensing unit is half-bridge or full bridge structure.
Sensor for identifying magnetic medium the most according to claim 1, it is characterized in that: described excitation is permanent magnet or electric magnet, its effective exciting field width is more than or equal to the sensing width of single sensing unit, and excitation is positioned at the side of two sensing units.
Sensor for identifying magnetic medium the most according to claim 1, it is characterised in that: said two sensing unit is fixed by skeleton, and described excitation and said two sensing unit share a skeleton, or described excitation is placed on outside skeleton.
Sensor for identifying magnetic medium the most according to claim 3, it is characterised in that: the material of described skeleton is non magnetic high-abrasive material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310380197.1A CN103456072B (en) | 2013-08-27 | 2013-08-27 | A kind of sensor for identifying magnetic medium |
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| CN201310380197.1A CN103456072B (en) | 2013-08-27 | 2013-08-27 | A kind of sensor for identifying magnetic medium |
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| CN103456072A CN103456072A (en) | 2013-12-18 |
| CN103456072B true CN103456072B (en) | 2016-11-02 |
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| CN104021411B (en) * | 2014-05-30 | 2017-11-24 | 江苏多维科技有限公司 | A kind of magnetic anti-counterfeiting mark and its identifying system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2439016Y (en) * | 2000-04-04 | 2001-07-11 | 梁中华 | Bank note magnetic sensor |
| CN1589457A (en) * | 2001-12-21 | 2005-03-02 | 德国捷德有限公司 | Sheet material and devices and methods for the production and treatment of the sheet material |
| CN102272613A (en) * | 2008-12-10 | 2011-12-07 | 德国捷德有限公司 | Magnetic sensor for checking value documents |
| CN203433575U (en) * | 2013-08-27 | 2014-02-12 | 无锡乐尔科技有限公司 | Sensor for identifying magnetic medium |
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2013
- 2013-08-27 CN CN201310380197.1A patent/CN103456072B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2439016Y (en) * | 2000-04-04 | 2001-07-11 | 梁中华 | Bank note magnetic sensor |
| CN1589457A (en) * | 2001-12-21 | 2005-03-02 | 德国捷德有限公司 | Sheet material and devices and methods for the production and treatment of the sheet material |
| CN102272613A (en) * | 2008-12-10 | 2011-12-07 | 德国捷德有限公司 | Magnetic sensor for checking value documents |
| CN203433575U (en) * | 2013-08-27 | 2014-02-12 | 无锡乐尔科技有限公司 | Sensor for identifying magnetic medium |
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Effective date of registration: 20191226 Address after: 233000 Room 228, 2nd Floor, West Building, City Gate Building, Bengbu City, Anhui Province Patentee after: Bengbu Ximag Technology Co.,Ltd. Address before: 204, room 214028, Science Park, block 34, 7 Changjiang Road, Wuxi New District, Jiangsu, China Patentee before: WUXI LER TECHNOLOGY Co.,Ltd. |
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Address after: Xici Technology Industrial Park, No. 321 Taibo Road, Sensing Valley C District, Bengbu Economic Development Zone, Anhui Province, 233060 Patentee after: Anhui Xici Technology Co.,Ltd. Address before: Room 228, 2nd Floor, West Building, Chengzhimen Building, Bengbu City, Anhui Province, 233000 Patentee before: Bengbu Ximag Technology Co.,Ltd. |
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