CN203433575U - Sensor for identifying magnetic medium - Google Patents
Sensor for identifying magnetic medium Download PDFInfo
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- CN203433575U CN203433575U CN201320526003.XU CN201320526003U CN203433575U CN 203433575 U CN203433575 U CN 203433575U CN 201320526003 U CN201320526003 U CN 201320526003U CN 203433575 U CN203433575 U CN 203433575U
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Abstract
The utility model discloses a sensor for identifying a magnetic medium. The sensor for identifying the magnetic medium comprises an excitation and two sensing units. The magnetic field induction directions of the two sensing units are mutually perpendicular. The sensor is suitable for identifying the magnetic medium. Magnetic sensing elements are utilized in the sensing units of the sensor, wherein the sensing elements can be a Hall element, an anisotropy magnetoresistive element, a giant magnetoresistive element or a magnetic tunnel junction element. The magnetic sensing element is suitable for large batch production, the production process is relatively simple and mature, and the yield is high, so that the processing process of the sensor is relatively simple and the production cost is low. Since the sensor is capable of measuring the field strength at the two magnetic leakage directions of the magnetic medium, the sensor can distinguish and detect the magnetic medium more accurately and anti-fake and encryption grade can be improved.
Description
Technical field
The utility model relates to Magnetic Sensor technical field, particularly a kind of for identifying for example magnetic secret paper of magnetic medium, bank note, the sensor of the magnetic such as check and magnetic card.
Background technology
In daily life, the use of magnetic medium is very extensive, be applied to all kinds of false proof and encrypt, various magnetic secret papers for example, bank note, check, magnetic card etc.The general mode that existing magnetic sensor reads magnetic medium signal is by measuring the stray field component of the single direction of magnetic medium, to identify the true and false of its magnetic signal.But for forging magnetic card, the lawless person of bank note etc., copys out the magnetic card identical with the stray field component of raw magnetic medium single direction or bank note comparatively speaking than being easier to, its technological means is relatively ripe, copys cost relatively cheap.Universal like this sensor only is just not enough to judge the true and false of magnetic card or bank note with the single stray field component of identification medium.The utility model is that a kind of for identifying the sensor of two leakage field directions of magnetic medium, it can be distinguished more accurately, detects magnetic medium, improves false proof and secret grade.
Utility model content
The utility model object is for the upgrading of existing magnetic sensor and a kind of sensor that can identify two leakage field directions of magnetic medium is provided.
The utility model for achieving the above object, adopts following technical scheme:
For identifying a sensor for magnetic medium, comprise excitation and two sensing units, it is characterized in that: the magnetic field induction direction of described two sensing units is mutually vertical.
Preferred: each unit of two sensing units is by printed-wiring board (PWB), magnetic sensor elements, corresponding circuit and draw pin and form, by output, draw pin and be connected output signal with peripheral circuit, the printed-wiring board (PWB) of described two sensing units is used separately or shares, and described two sensing unit induction zones are no more than 2 millimeters apart from the distance of magnetic medium.
Preferred: each unit of described two sensing units can and draw pin by magnetic sensor elements, package casing and form, described magnetic sensor elements comprises integrated circuit, by output, draw pin and be connected output signal with peripheral circuit, described two sensing unit induction zones are no more than 2 millimeters apart from the distance of magnetic medium.
It is further characterized in that: the magnetic sensor elements of described two sensing units can be the magnetic sensor elements such as Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or magnetic tunnel junction element.
Preferred: describedly for identifying the single sensing unit of magnetic medium, can comprise one or more magnetic sensor elements, and the magnetic field induction direction of a plurality of magnetic sensor elements in a sensing unit to be parallel to each other.
Preferred: the magnetic sensor elements in described two sensing units can be single resistance, half-bridge or full bridge structure.
Further: described excitation is permanent magnet or electromagnet, its effective exciting field width is more than or equal to the induction width of magnetic field sensing unit, and excitation is positioned at a side of two magnetic transducing unit.
Preferred: described two sensing units and excitation are fixed by skeleton, described excitation can be shared a skeleton with described two sensing units, or is placed on outside skeleton.
The material of described skeleton is non magnetic high-abrasive material.
The utility model can be measured the field intensity of two leakage field directions of magnetic medium, than general class magnetic head sensor, has higher precision, thereby can improve anti-fake encrpted grade.
Accompanying drawing explanation
Fig. 1 be the utility model embodiment provide for identifying the schematic diagram of the sensor of magnetic medium.
Embodiment
Below in conjunction with drawings and Examples, utility model content of the present utility model is further described.
The sensor of existing identification magnetic medium only can be measured the field intensity of a direction stray field of magnetic medium.
Embodiment of the present utility model as shown in Figure 1, what the present embodiment provided comprises sensing unit 11, sensing unit 12, excitation 13 for identifying the sensor of magnetic medium, described sensing unit 11 and sensing unit 12 comprise magnetic sensor elements and circuit, and the magnetic field induction direction 1 of described sensing unit 11 is mutually vertical with the magnetic field induction direction of sensing unit 12 2.Excitation 13 can provide exciting field 21 for magnetized medium, can be that permanent magnet can be also electromagnet, the width of its effective exciting field 21 is more than or equal to the induction width of sensing unit, exciting field 21 can be any direction, this direction can be adjusted according to the shape of excitation 13, if excitation 13 is permanent magnet, the large I of its field intensity determines according to its material, if electromagnet, the size of current that can pass through by control determines.
Described sensing unit 11 and sensing unit 12 can and draw pin by printed-wiring board (PWB), magnetic sensor elements, corresponding circuit and form, its input end and output terminal weld with the respective terminal of printed-wiring board (PWB) respectively, by output, draw pin 14 and be connected output signal with peripheral circuit, the printed-wiring board (PWB) of described sensing unit 11 and sensing unit 12 can share, also can be two printed-wiring board (PWB)s, the induction zone of magnetic sensor elements during work in two sensing units be no more than 2 millimeters apart from the distance of magnetic medium.
Described sensor can be also 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 comprises integrated circuit, by output, draw pin 14 and be connected with peripheral circuit, induction zone during work in two sensing units is no more than 2 millimeters apart from the distance of magnetic medium.
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 be shared a skeleton with described two sensing units, also can be placed on outside skeleton.Described skeleton is a kind of special-shaped structural part, do not draw in the accompanying drawings, its shape and size and sensing unit 11, sensing unit 12, excitation (if excitation and sensing unit are shared a skeleton) match, and the inside surface close contact of its outward flange and metal shell 15, in order to fixedly sensing unit 11, sensing unit 12, printed-wiring board (PWB) and excitation 13.Meanwhile, described skeleton and metal shell 15 are also provided with through hole, and position and size that the position of this through hole and size are drawn pin 14 with output are respectively mated, and making output draw pin 14 can be through the through hole of skeleton.Meanwhile, described metal shell 15 is accommodating in it and will be fixing by skeleton, an end opening of metal shell 15, and one end relative with this opening is detection faces.Meanwhile, metal shell 15 is provided with grounding lead pin 16, for shielding the electromagnetic interference (EMI) except described sensor, and for eliminating static.
As shown in Figure 1, during work, magnetic medium bar 22 is first by excitation 13, and after the media particle 23 of 21 pairs of magnetic medium bars 22 of exciting field magnetizes, sensing unit 11 and sensing unit 12 are measured the stray field 25 of media particle 23 again.The below of Fig. 1 is that magnetic medium bar 22 is by the vertical view of magnetic moment 24 state variation of the rear media particle 23 of excitation 13 magnetization, if medium is soft magnetic material, magnetic moment 24 directions of media particle 23 are identical with the direction of exciting field 21, if medium is hard magnetic material, the vector of the magnetic moment 24 of media particle 23 is identical with the direction of exciting field 21.When working sensor, the magnetic medium bar 21 that scribbles media particle 23 moves after by excitation 13 magnetization below sensing unit 11 and sensing unit 12, the induction zone of the magnetic sensor elements in two sensing units is no more than 2 millimeters apart from the distance of magnetic medium, the stray field 25 of magnetic moment 24 that now sensing unit 11 and sensing unit 12 can be measured media particle is quantitatively along its magnetic field induction direction 1, the size of stray field 25 components in 2 directions, output signal is drawn pin 14 by output and is delivered to peripheral circuit, and then by the micro treatmenting device of peripheral circuit, calculated the state of the stray field 25 of media particle 23.
The utility model scheme can also detect multichannel magnetic medium signal.Sensing unit 11 and sensing unit 12 comprise a plurality of magnetic sensor elements, multichannel magnetic medium bar is after a microscler excitation magnetization, orthogonal two the adjacent magnetic sensor elements of magnetic field induction direction are one group and measure a road magnetic medium signal, and its output signal processes 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 adopt Hall element, also can adopt AMR element, GMR element or MTJ element, if adopt other elements except Hall element, there is higher sensitivity, better temperature characterisitic and anti-stress ability, higher signal to noise ratio (S/N ratio).Because described sensor can be measured the field intensity of two leakage field directions of magnetic medium,, its measuring accuracy will be far away higher than the sensor of prior art, thereby can improve anti-fake encrpted grade.
Should be appreciated that the above detailed description of the technical solution of the utility model being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of the utility model instructions, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (9)
1. for identifying a sensor for magnetic medium, comprise excitation and two sensing units, it is characterized in that: two sensing units of described sensor comprise magnetic sensor elements, the magnetic field induction direction of two sensing units is mutually vertical simultaneously.
2. according to claim 1 for identifying the sensor of magnetic medium, it is characterized in that: each unit of described two sensing units comprises that printed-wiring board (PWB), magnetic sensor elements, corresponding circuit and output draws pin, by output, draw pin and be connected output signal with peripheral circuit, the printed-wiring board (PWB) of described two sensing units is used separately or shares, and described two sensing unit induction zones are no more than 2 millimeters apart from the distance of magnetic medium.
3. according to claim 1 for identifying the sensor of magnetic medium, it is characterized in that: each unit of described two sensing units comprises magnetic sensor elements, package casing and draws pin, described magnetic sensor elements comprises integrated circuit, by output, draw pin and be connected output signal with peripheral circuit, described two sensing unit induction zones are no more than 2 millimeters apart from the distance of magnetic medium.
According to described in claim 1-3 for identifying the sensor of magnetic medium, it is characterized in that: the magnetic sensor elements of described two sensing units is the magnetic sensor elements that comprises Hall element, anisotropic magnetoresistance element, giant magnetoresistance element or magnetic tunnel junction element.
According to described in claim 1-3 for identifying the sensor of magnetic medium, it is characterized in that: describedly for identifying the single sensing unit of magnetic medium, comprise one or more magnetic sensor elements, and the magnetic field induction direction of a plurality of magnetic sensor elements in a sensing unit is parallel to each other.
6. according to claim 5 for identifying the sensor of magnetic medium, it is characterized in that: the magnetic sensor elements in described two sensing units is single resistance, half-bridge or full bridge structure.
According to described in claim 1-3 any one for identifying the sensor of magnetic medium, it is characterized in that: described excitation is permanent magnet or electromagnet, its effective exciting field width is more than or equal to the induction width of magnetic field sensing unit, and excitation is positioned at a side of two sensing units.
According to described in claim 1-3 any one for identifying the sensor of magnetic medium, it is characterized in that: described two sensing units are fixed by skeleton, described excitation and described two sensing units are shared a skeleton, or are placed on outside skeleton.
9. according to claim 8 for identifying the sensor of magnetic medium, it is characterized in that: the material of described skeleton is non magnetic high-abrasive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320526003.XU CN203433575U (en) | 2013-08-27 | 2013-08-27 | Sensor for identifying magnetic medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320526003.XU CN203433575U (en) | 2013-08-27 | 2013-08-27 | Sensor for identifying magnetic medium |
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| CN203433575U true CN203433575U (en) | 2014-02-12 |
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| CN201320526003.XU Expired - Lifetime CN203433575U (en) | 2013-08-27 | 2013-08-27 | Sensor for identifying magnetic medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103456072A (en) * | 2013-08-27 | 2013-12-18 | 无锡乐尔科技有限公司 | Sensor used for identifying magnetic media |
| CN104157071A (en) * | 2014-07-25 | 2014-11-19 | 无锡乐尔科技有限公司 | Anti-counterfeiting system and method adopting magnetic image |
| WO2015180569A1 (en) * | 2014-05-30 | 2015-12-03 | 江苏多维科技有限公司 | Magnetic anti-counterfeit mark and identification system thereof |
| CN108037179A (en) * | 2018-01-25 | 2018-05-15 | 哈尔滨工业大学深圳研究生院 | Ferromagnetic component non-destructive testing device and its detection method based on crowded magnetic structure |
-
2013
- 2013-08-27 CN CN201320526003.XU patent/CN203433575U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103456072A (en) * | 2013-08-27 | 2013-12-18 | 无锡乐尔科技有限公司 | Sensor used for identifying magnetic media |
| CN103456072B (en) * | 2013-08-27 | 2016-11-02 | 无锡乐尔科技有限公司 | A kind of sensor for identifying magnetic medium |
| WO2015180569A1 (en) * | 2014-05-30 | 2015-12-03 | 江苏多维科技有限公司 | Magnetic anti-counterfeit mark and identification system thereof |
| US9805224B2 (en) | 2014-05-30 | 2017-10-31 | MultiDimension Technology Co., Ltd. | Magnetic anti-counterfeit label and identification system thereof |
| CN104157071A (en) * | 2014-07-25 | 2014-11-19 | 无锡乐尔科技有限公司 | Anti-counterfeiting system and method adopting magnetic image |
| CN108037179A (en) * | 2018-01-25 | 2018-05-15 | 哈尔滨工业大学深圳研究生院 | Ferromagnetic component non-destructive testing device and its detection method based on crowded magnetic structure |
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| C14 | Grant of patent or utility model | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20140212 |
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| CX01 | Expiry of patent term |