CN202916902U - Currency detection magnetic head with magnetic bias processing-based sensitive direction parallel to detection surface - Google Patents
Currency detection magnetic head with magnetic bias processing-based sensitive direction parallel to detection surface Download PDFInfo
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- CN202916902U CN202916902U CN2012205651132U CN201220565113U CN202916902U CN 202916902 U CN202916902 U CN 202916902U CN 2012205651132 U CN2012205651132 U CN 2012205651132U CN 201220565113 U CN201220565113 U CN 201220565113U CN 202916902 U CN202916902 U CN 202916902U
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Abstract
The utility model relates to a currency detection magnetic head with a magnetic bias processing-based sensitive direction parallel to a detection surface. The currency detection magnetic head comprises a magnetic resistance sensor chip, a flexible print circuit board coupled with the magnetic resistance sensor chip, and a magnetic bias unit. The magnetic resistance sensor chip includes a circuit having a magnetosensitive element, wherein the sensitive direction of the magnetosensitive element is parallel to a detection surface of the currency detection magnetic head. The magnetic bias unit, which is arranged at one side, far away from the detection surface of the currency detection magnetic head, of the magnetic resistance sensor chip, includes at least two permanent magnets forming a rectangular isolation area or an air gap, wherein the isolation area or the air gap is arranged right below the magnetic resistance sensor chip. The provided currency detection magnetic head has high sensitivity and a high signal to noise ratio.
Description
Technical field
The utility model relates to the magnetoresistive transducer technical field, particularly a kind of magnetic resistance currency examine magnetic head.
Background technology
In the daily life, the application of currency examine magnetic head is very extensive, for example automatic vending machine, paper money counter, and the bank note inspection machine etc.Usually, the magnetic of bank note very a little less than, therefore, the currency examine magnetic head that is used for identification bank note magnetic need to have the characteristic of high sensitivity, low noise and high s/n ratio.
Fig. 1 shows a kind of currency examine magnetic head of prior art, and what the sensor element in this currency examine magnetic head detected is the magnetic-field component vertical with the magnetic head detection faces, and this magnetic field is produced by the magnetic ink on the bank note.Generally, this sensor element material therefor is indium antimonide.The currency examine magnetic head that is made of this sensor element has following shortcoming:
(1) sensitivity of indium antimonide Hall unit and signal to noise ratio (S/N ratio) are very low, cause the sensitivity of this kind currency examine magnetic head and signal to noise ratio (S/N ratio) very low;
(2) indium antimonide sensor and be subjected to the impact of temperature very obvious needs complicated temperature-compensation circuit;
(3) indium antimonide sensor intrinsic noise is larger, therefore needs the magnetic bias element that very large offset signal is provided, and to improve signal to noise ratio (S/N ratio), causes thus the volume of magnetic bias element larger, and then causes currency examine magnetic head volume larger;
(4) have a planar poles of magnetic bias element near the magnetic head detection faces, this magnetic pole produces the magnetic-field component parallel with detection faces.Because the existence of this magnetic-field component causes being difficult to accurately measuring the size that testee produces magnetic field.
Therefore, need a kind of currency examine head that can accurately measure testee magnetic field size.
The utility model content
In order to solve the above problems, the utility model provides a kind of magnetic resistance currency examine magnetic head.Used magnetoresistive transducer can be measured the magnetic-field component that is parallel to detection faces that testee produces in the utility model, and sensor can be the tunnel magnetoresistive sensor, or giant magneto-resistance sensor, or anisotropic magnetoresistive sensor etc.
According to the present invention, a kind of currency examine magnetic head is provided, this currency examine magnetic head comprises the magnetoresistive transducer chip, with flexible printed circuit board and the magnetic bias unit of this magnetoresistive transducer chip coupling,
Described magnetoresistive transducer chip comprises the circuit with magneto sensor, and the sensitive direction of described magneto sensor is parallel to the detection faces of described currency examine magnetic head,
Described magnetic bias element is sidelong away from currency examine magnetic head detection faces one at described magnetoresistive transducer chip and is put, and
Described magnetic bias unit comprises at least two permanent magnets that form rectangle area of isolation or air gap, this area of isolation or air gap be positioned at the magnetoresistive transducer chip under.
Preferably, be filled with nonmagnetic substance or soft iron magnetic material in the described area of isolation.
Preferably, described at least two permanent magnets are respectively the rectangular parallelepiped permanent magnet.
Preferably, described magnetic bias unit be arranged such that the magnetic field that produces at the component of described magneto sensor sensitive direction less than 25 Gausses.
Preferably, this currency examine magnetic head further comprises the printed circuit board (PCB) that passes through the electric welding of Bonding mode between described magnetoresistive transducer chip and described magnetic bias unit with described magnetoresistive transducer chip.
Preferably, this currency examine magnetic head comprises that further the currency examine magnetic head input and output that are connected with flexible PCB draw pin.
Preferably, described magneto sensor is tunnel magnetoresistive TMR element, giant magnetoresistance GMR element or anisotropic magnetoresistive AMR element.
Preferably, described magneto sensor is series connection and/or the TMR element that is connected in parallel or series connection and/or the GMR element that is connected in parallel or series connection and/or the AMR element that is connected in parallel.
Preferably, described series connection and/or the TMR element that is connected in parallel or series connection and/or the GMR element that is connected in parallel or series connection and/or the AMR element that is connected in parallel consist of single arm structure or half-bridge structure or full bridge structure.
Preferably, described magnetoresistive transducer chip is single armed sensor chip, half-bridge sensor chip, perhaps full-bridge sensors chip.
Preferably, this magnetic head further comprises the metal shell that holds described magnetoresistive transducer chip and described magnetic bias unit, and described metal shell is provided with earth terminal.
Preferably, be filled with in the described metal shell for injection molding body fixing and isolation.
Preferably, this magnetic head further comprises the metal shell that holds described magnetoresistive transducer chip and described magnetic bias unit, and this shell has opening at magnetic head detection faces opposite side.
The utlity model has following beneficial effect:
(1) currency examine magnetic head described in the utility model both had been applicable to identify the bank note of being made by retentive material, was applicable to again identify the bank note of being made by soft magnetic material;
(2) currency examine magnetic head described in the utility model adopts the magnetoresistive transducer chip that comprises such as magneto sensors such as tunnel magnetoresistive TMR element, giant magnetoresistance GMR element or anisotropic magnetoresistive AMR elements, compare with indium antimonide Hall unit, sensitivity and the signal to noise ratio (S/N ratio) of above-mentioned magneto sensor are higher, and therefore described currency examine magnetic head has higher sensitivity and signal to noise ratio (S/N ratio);
(3) because the manufacture craft of above-mentioned magneto sensor is simpler, and be not subject to the impact of environment temperature and stress, yield rate is high, and therefore simpler according to the processing technology of currency examine magnetic head of the present utility model, cost is lower;
(4) form depression by the magnetic bias element with the currency examine magnetic head, it is very little or level off to zero at the component of above-mentioned magneto sensor sensitive direction to have magnetic field that the magnetic bias element of depression produces, so that above-mentioned magneto sensor can be operated in linear zone, thereby can guarantee that the currency examine magnetic head can work;
(5) because the sensor chip of currency examine magnetic head adopts bridge architecture so that the currency examine magnetic head can establishment from the interference in the common mode magnetic field outside the described currency examine magnetic head;
(6) currency examine magnetic head of the present utility model both can be used for cash inspecting machine, can be used for cashier's machine again;
(7) adopt flexible circuit board connection printed-wiring board (PWB) and output to draw pin according to currency examine magnetic head of the present utility model, and flexible circuit board can not produce restriction to the profile of permanent magnet, be conducive to the design of permanent magnet.
Description of drawings
Fig. 1 is the synoptic diagram of the currency examine magnetic head of prior art comparative example 1;
Fig. 2 (A) is the magnetic line of force distribution plan in the magnetic field that the rectangle permanent magnet produces in the magnetic head shown in Figure 1;
Fig. 2 (B) is the magnetic field distribution that the rectangle permanent magnet produces in the magnetic head shown in Figure 1;
Fig. 3 (A) is the magnetic line of force distribution plan in the magnetic field that the rectangle permanent magnet produces in the magnetic head of prior art comparative example 2;
Fig. 3 (B) is the magnetic field distribution that the rectangle permanent magnet produces in the magnetic head of prior art comparative example 2;
Fig. 4 is the synoptic diagram according to the currency examine magnetic head of the utility model embodiment;
Fig. 5 illustrates the schematic top plan view according to the currency examine magnetic head of the utility model embodiment;
Fig. 6 (A) is the magnetic line of force distribution plan in the magnetic field that the magnetic bias unit produces in the magnetic head of example 4;
Fig. 6 (B) is the magnetic field distribution that the magnetic bias unit produces in the magnetic head of example 4.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the technical solution of the utility model in detail.In embodiment, similar Reference numeral represents similar feature or element.
Comparative example 1
Fig. 1 illustrates the synoptic diagram of the currency examine magnetic head of comparative example 1.This currency examine magnetic head comprises that sensor chip 11, printed-wiring board (PWB) (PCB) 12, input and output draw pin 13, metal shell 14, permanent magnet 15 and injection molding body (not shown).On the face away from detection faces of metal shell 14 opening is arranged, be used for assembling and input and output and draw drawing of pin.Sensor chip 11 is installed near the detection faces of metal shell 14, and its magnetosensitive perpendicular direction is in the magnetic head detection faces.Sensor chip 11 and permanent magnet 15 are located at respectively the both sides of printed-wiring board (PWB) 12.The magnetizing direction of permanent magnet 15 as shown in Figure 1.Directly do not contact between printed-wiring board (PWB) 12 and the permanent magnet 15.The input end of sensor chip 11 and output terminal respectively with printed-wiring board (PWB) 12 on respective terminal welding so that printed-wiring board (PWB) 12 can support and fixation of sensor chip 11.The respective terminal welding of an end and the printed-wiring board (PWB) 12 of pin 13 is drawn in input and output, so that input end and the output terminal conducting of pin 13 and sensor chip 11 are drawn in input and output.Input and output are drawn the other end of pin 13 as the output terminal of currency examine magnetic head.Sensor chip 11 adopts indium antimonide Hall unit, and the sensitive direction 17 of indium antimonide Hall unit is perpendicular to the detection faces of magnetic head.Metal shell 14 is provided with grounding lead pin 16.The metal shell 14 that is provided with grounding lead pin 16 is used for shielding from the electromagnetic interference (EMI) outside the metal shell 14, and eliminates static.The shape of permanent magnet 15 can be rectangular parallelepiped.The shape and size of injection molding body are mated with the shape and size of metal shell 14, printed-wiring board (PWB) 12 and permanent magnet 15 respectively, are used for fixing metal shell 14, printed-wiring board (PWB) 12 and permanent magnet 15, and realize the electrical isolation of printed-wiring board (PWB) 12 and permanent magnet 15.
The sensor chip of currency examine magnetic head adopts indium antimonide Hall unit in this comparative example 1, and the sensitivity of described currency examine magnetic head and signal to noise ratio (S/N ratio) are very low.Since the complex manufacturing technology of indium antimonide Hall unit, and be subjected to the impact of temperature and stress very obvious, yield rate is low, causes the processing technology complexity of the currency examine magnetic head of comparative example, and cost is high.On the other hand, directly be fixed on the printed-wiring board (PWB) because an end of pin is drawn in the output of the currency examine magnetic head of comparative example, and output draws pin and can not directly pass permanent magnet, therefore output draw pin position limitation the size of permanent magnet, increase the difficulty of design.In addition, because the permanent magnet of the currency examine magnetic head of comparative example 1 is rectangular parallelepiped, when sensor chip adopts the MTJ element, the magnetic field that rectangular permanent magnet produces is very large along the component of MTJ element sensitive direction, cause the working point of MTJ element to depart from its linear work district, even the resistance that causes the MTJ element reaches capacity to the response in magnetic field, thereby affects the performance of currency examine magnetic head, even causes the currency examine magnetic head to work.
Fig. 2 (A) is in the currency examine magnetic head shown in Figure 1, the magnetic line of force distribution plan in the magnetic field that rectangular magnet produces.Have the direction of magnetization of permanent magnet 15 of rectangular cross section structure among the figure perpendicular to detection faces 40, detection faces is with " AA " among figure expression.Magnetoresistive sensor element 41 is positioned at the below of detection faces 40, and " BB " direction in figure is placed.The magnetic line of force in the magnetic field that permanent magnet 15 produces is shown in the fine line 23 among the figure.Fig. 2 (B) has showed that magnetic field that permanent magnet 15 produces is parallel to the component 28 of detection faces direction at the detection faces place and perpendicular to the component 27 of detection faces direction, transverse axis 29 is illustrated in the side-play amount of position on " AA " direction.In traditional Hall effect currency examine magnetic head, only detection of vertical is in the magnetic-field component 27 of detection faces direction for sensor, and the magnetic-field component 28 that therefore is parallel to the detection faces direction can not produce on the work of currency examine magnetic head any impact.
If when the induction direction of magnetoresistive transducer is parallel to detection faces 40, must improve lift magnet, to reduce the magnetic field that is parallel to detection faces that permanent magnet produces to the impact of sensor sensing signal.
Prior art comparative example 2
The volume ratio that increases lift magnet and sensor element is a kind of effective ways that address the above problem.Fig. 3 (A) and 3 (B) are respectively magnetic line of force distribution plan and the magnetic field distribution figure in the magnetic field that the rectangle permanent magnet produces in the magnetic head of prior art comparative example 2.Comparison diagram 3(A) and Fig. 2 (A) can find out that lift magnet 35 proximity sense elements 41 one side has the area of remarkable increase.Can find out that from Fig. 3 (A) direction of magnetization 21 of permanent magnet 35 is perpendicular to detection faces 40, the detection side is to being " AA " among the figure.Magnetoresistive sensor element 41 is positioned at the below of detection faces 40, and " BB " direction in figure is placed.The magnetic line of force in the magnetic field that permanent magnet 35 produces is shown in the solid line 23 among the figure.Fig. 3 (B) has showed that magnetic field that permanent magnet 35 produces is parallel to the component 28 of detection faces direction at the detection faces place and perpendicular to the component 27 of detection faces direction, transverse axis 29 is illustrated in the side-play amount of position on " AA " direction.Can find out that from Fig. 3 (B) magnetic-field component 28 that comparative example 2 is parallel to the detection faces direction is significantly less than the magnetic-field component that is parallel to the detection faces direction of comparative example 1 among Fig. 2 (B).
But in the comparative example 2, larger permanent magnet volume can increase the volume of currency examine magnetic head, and then increases the difficulty that it is installed in cash inspecting machine.Further, the volume that increases permanent magnet and magnetic head means the increase of cost of products, and then increases the cost of cash inspecting machine.
Preferred embodiment of the present utility model
Fig. 4 illustrates the currency examine magnetic head synoptic diagram according to the utility model embodiment.Comprise magnetic bias element 45, flexible circuit board (FPC) 46, the first injection molding body 47 and the second injection molding body 50 that magnetoresistive transducer chip 41, printed-wiring board (PWB) 42, input and output are drawn pin 43, metal shell 44, are made of at least two permanent magnets according to magnetic resistance currency examine magnetic head of the present utility model, and have detection faces 40.Be formed with rectangle area of isolation or air gap between the magnetic bias element 45 that at least two permanent magnets consist of, this area of isolation or air gap be positioned at the magnetoresistive transducer chip under.Metal shell 44 adopts non magnetic high-abrasive material, and it has opening in the side away from detection faces 40.Magnetoresistive transducer chip 41 is interior near detection faces 40 installations at metal shell 44, and the sensitive direction of magneto sensor is parallel with the detection faces of currency examine magnetic head in the chip.Detection faces 40 side outer surface of outer cover are less than or equal to 0.2mm apart from the distance between the magnetoresistive transducer chip upper surface.Magnetoresistive transducer chip 41 and magnetic bias unit 45 lay respectively at the both sides of printed-wiring board (PWB) 42.The magnetizing direction of magnetic bias unit 45 is perpendicular to detection faces 40, as shown in Figure 4.The second injection molding body 50 for example between printed-wiring board (PWB) 42 and magnetic bias unit 45, is used for printed-wiring board (PWB) 42 and 45 isolation of magnetic bias unit.The input end of sensor chip 41 and output terminal respectively with printed-wiring board (PWB) 42 on respective terminal for example by being welded to connect, so that printed-wiring board (PWB) 42 can support and fixation of sensor chip 41.The first injection molding body 47 is positioned at 45 belows, magnetic bias unit.It is fixing by the first injection molding body 47 that pin 43 is drawn in input and output.One end of flexible circuit board 46 is electrically connected with the respective terminal of printed-wiring board (PWB) 42, and the other end of flexible circuit board 46 is electrically connected with the end that pin 43 is drawn in input and output so that input and output draw pin 43 respectively with input end and the output terminal conducting of sensor chip 41.Input and output are drawn the other end of pin 43 as the input/output terminal of currency examine magnetic head.Sensor chip 41 comprises a bridge circuit at least, and this bridge circuit comprises a brachium pontis at least, and preferably, each brachium pontis can comprise a for example tunnel magnetoresistive TMR element at least, the magneto sensor of giant magnetoresistance GMR element or anisotropic magnetoresistive AMR element.More preferably, the tunnel magnetoresistive TMR element that each brachium pontis can comprise series connection and/or be connected in parallel, series connection and/or giant magnetoresistance GMR element in parallel, or series connection and/or anisotropic magnetoresistive AMR element in parallel.In the present embodiment, sensor chip 41 has full bridge structure, and each brachium pontis in this full bridge structure comprises a magneto sensor at least.The sensitive direction 49 of magneto sensor is parallel with the detection faces of currency examine magnetic head, and each the rectangular parallelepiped permanent magnet in the magnetic bias element 45 has four faces vertical with the detection faces of currency examine magnetic head, has two faces parallel with the detection faces of currency examine magnetic head.Preferably, metal shell 44 is provided with grounding lead pin 48, and the metal shell of ground connection is used for shielding from the electromagnetic interference (EMI) outside the metal shell 44, and is used for eliminating static.The shape and size of the second injection molding body 50 are complementary with the shape and size of metal shell 44, printed-wiring board (PWB) 42 and magnetic bias unit 45 respectively, are used for printed-wiring board (PWB) 42 and magnetic bias unit 45 are fixed on metal shell 44.Preferably, the first injection molding body 47 and the second injection molding body 50 can fasten.
Fig. 5 illustrates the schematic top plan view according to the currency examine magnetic head of the magnetoresistive transducer chip that the utlity model has full bridge structure.As shown in the figure, magnetoresistive transducer chip 41 is positioned at the top of magnetic bias unit 45.At surveyed area 90 of magnetoresistive transducer chip 41 interior existence, in this zone, the magnetic induction density that is parallel to detection faces 40 that permanent magnet 45 produces is less than 25 Gausses, and magnetic bias unit 45 can not be magnetized into each magneto sensor 91 in should the zone saturated.Therefore, can guarantee to be in the magneto sensor that its magnetosensitive direction is parallel to detection faces in the surveyed area and be operated in linear zone.In the direction that is parallel to magneto sensor sensitive direction 49, the range of size of surveyed area 90 for example is that 1mm is to 10mm.
When using magnetic resistance currency examine magnetic head, with the detection faces of bank note near described magnetic resistance currency examine magnetic head, and it is moved with respect to this detection faces, and the magnetoresistive transducer chip will detect the heat treatment of bank note and draw the pin output correlation signal by output, thereby realizes the identification to bank note magnetic.
Both be applicable to identify the magnetic of the bank note of being made by retentive material according to the magnetic resistance currency examine magnetic head of the utility model preferred embodiment, be applicable to again identify the magnetic of the bank note of being made by soft magnetic material.Described magnetic resistance currency examine magnetic head preferably adopts its sensitive direction to be parallel to the magneto sensor of the detection faces of currency examine magnetic head.Compare with indium antimonide Hall unit, sensitivity and the signal to noise ratio (S/N ratio) of these magneto sensors are higher, and therefore sensitivity and the signal to noise ratio (S/N ratio) of described magnetic resistance currency examine magnetic head are higher.The manufacture craft of these magneto sensors is simpler, and is not subject to the impact of temperature and stress, and yield rate is high, and therefore the processing technology of described magnetic resistance currency examine magnetic head is simpler, and cost is lower.Because described magnetic resistance currency examine magnetic head adopts flexible circuit board to connect printed-wiring board (PWB) and pin is drawn in input and output, and flexible circuit board can not produce restriction to the profile of permanent magnet, be conducive to the design of permanent magnet.Owing to adopt a plurality of permanent magnets to consist of the magnetic bias elements, the gap between the permanent magnet makes the magnetic field that produced by the magnetic bias element very little or level off to zero along the component of magneto sensor sensitive direction, thereby makes magneto sensor be operated in linear zone.Because the sensor chip of described magnetic resistance currency examine magnetic head adopts the magnetoresistive element of bridge circuit structure so that described magnetic resistance currency examine magnetic head can establishment from the interference in the common mode magnetic field outside the described magnetic resistance currency examine magnetic head.Described magnetic resistance currency examine magnetic head both can be used for cash inspecting machine, can be used for cashier's machine again.
Respectively the example of magnetic bias unit is described in detail below with reference to accompanying drawings.
Example 1
Fig. 6 (A) is the magnetic line of force distribution plan in the magnetic field that the magnetic bias unit produces in the magnetic head of example 1.In this design, two permanent magnets with square-section 85 are arranged, and have area of isolation 84 between two permanent magnets, the materials in the area of isolation 84 can be nonmagnetic metal material, non-magnetic plastic, nonmagnetic ceramic materials, perhaps soft iron magnetic material etc.The direction of magnetization of permanent magnet 85 is perpendicular to detection faces 40, and above described area of isolation 84, the magnetic field intensity that is parallel to detection faces 40 is zero.
Fig. 6 (B) is along the magnetic field distribution figure of detection faces 40 in the magnetic flux of embodiment 1, wherein dotted line 87 is perpendicular to the magnetic field strength component of detection faces 40, the 88th, be parallel to the magnetic field strength component of detection faces 40, the longitudinal axis 86 is magnetic induction density, transverse axis is the offset distance along detection faces 40.As can be seen from the figure, the magnetic field intensity that is parallel to detection faces 40 above area of isolation 84 is less, and the numerical value of the magnetic field intensity of this direction is significantly less than the situation of the traditional structure among Fig. 2 and Fig. 3.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (13)
1. a currency examine magnetic head comprises the magnetoresistive transducer chip, with flexible printed circuit board and the magnetic bias unit of this magnetoresistive transducer chip coupling,
It is characterized in that,
Described magnetoresistive transducer chip comprises the circuit with magneto sensor, and the sensitive direction of described magneto sensor is parallel to the detection faces of described currency examine magnetic head,
Described magnetic bias element is sidelong away from currency examine magnetic head detection faces one at described magnetoresistive transducer chip and is put, and
Described magnetic bias unit comprises at least two permanent magnets that form rectangle area of isolation or air gap, this area of isolation or air gap be positioned at the magnetoresistive transducer chip under.
2. currency examine magnetic head as claimed in claim 1 is characterized in that, is filled with nonmagnetic substance or soft iron magnetic material in the described area of isolation.
3. currency examine magnetic head as claimed in claim 1 is characterized in that, described at least two permanent magnets are respectively the rectangular parallelepiped permanent magnet.
4. currency examine magnetic head as claimed in claim 1 is characterized in that, described magnetic bias unit be arranged such that the magnetic field that produces at the component of described magneto sensor sensitive direction less than 25 Gausses.
5. currency examine magnetic head as claimed in claim 1 is characterized in that, this currency examine magnetic head further comprises the printed circuit board (PCB) that passes through the electric welding of Bonding mode between described magnetoresistive transducer chip and described magnetic bias unit with described magnetoresistive transducer chip.
6. currency examine magnetic head as claimed in claim 1 is characterized in that, this currency examine magnetic head comprises that further the currency examine magnetic head input and output that are connected with flexible PCB draw pin.
7. currency examine magnetic head as claimed in claim 1 is characterized in that, described magneto sensor is tunnel magnetoresistive TMR element, giant magnetoresistance GMR element or anisotropic magnetoresistive AMR element.
8. currency examine magnetic head as claimed in claim 1 is characterized in that, described magneto sensor is series connection and/or the TMR element that is connected in parallel or series connection and/or the GMR element that is connected in parallel or series connection and/or the AMR element that is connected in parallel.
9. currency examine magnetic head claimed in claim 8, it is characterized in that described series connection and/or the TMR element that is connected in parallel or series connection and/or the GMR element that is connected in parallel or series connection and/or the AMR element that is connected in parallel consist of single arm structure or half-bridge structure or full bridge structure.
10. currency examine magnetic head as claimed in claim 1 is characterized in that, described magnetoresistive transducer chip is single armed sensor chip, half-bridge sensor chip, perhaps full-bridge sensors chip.
11. currency examine magnetic head as claimed in claim 1 is characterized in that, this magnetic head further comprises the metal shell that holds described magnetoresistive transducer chip and described magnetic bias unit, and described metal shell is provided with earth terminal.
12. currency examine magnetic head as claimed in claim 11 is characterized in that, is filled with in the described metal shell for injection molding body fixing and isolation.
13. currency examine magnetic head as claimed in claim 1 is characterized in that, this magnetic head further comprises the metal shell that holds described magnetoresistive transducer chip and described magnetic bias unit, and this shell has opening at magnetic head detection faces opposite side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012205651132U CN202916902U (en) | 2012-10-31 | 2012-10-31 | Currency detection magnetic head with magnetic bias processing-based sensitive direction parallel to detection surface |
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| CN2012205651132U CN202916902U (en) | 2012-10-31 | 2012-10-31 | Currency detection magnetic head with magnetic bias processing-based sensitive direction parallel to detection surface |
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| CN202916902U true CN202916902U (en) | 2013-05-01 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103744038A (en) * | 2013-12-31 | 2014-04-23 | 江苏多维科技有限公司 | Short-distance magnetic resistance imaging sensor array |
| WO2014067462A1 (en) * | 2012-10-31 | 2014-05-08 | 江苏多维科技有限公司 | Magnetic head for banknote detection |
| CN103927811A (en) * | 2014-03-25 | 2014-07-16 | 江苏多维科技有限公司 | Magnetic resistance magnetic image recognition sensor |
| CN104134269A (en) * | 2014-06-23 | 2014-11-05 | 江苏多维科技有限公司 | Coin detection system |
| CN106206934A (en) * | 2016-07-14 | 2016-12-07 | 长春禹衡光学有限公司 | A kind of gear type sensor module based on magnetoresistive chip and method for packing thereof |
| CN106461740A (en) * | 2014-05-13 | 2017-02-22 | 三菱电机株式会社 | Magnetic sensor device |
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2012
- 2012-10-31 CN CN2012205651132U patent/CN202916902U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014067462A1 (en) * | 2012-10-31 | 2014-05-08 | 江苏多维科技有限公司 | Magnetic head for banknote detection |
| US9721415B2 (en) | 2012-10-31 | 2017-08-01 | MultiDimension Technology Co., Ltd. | Magnetic head for banknote detection |
| CN103744038A (en) * | 2013-12-31 | 2014-04-23 | 江苏多维科技有限公司 | Short-distance magnetic resistance imaging sensor array |
| CN103927811A (en) * | 2014-03-25 | 2014-07-16 | 江苏多维科技有限公司 | Magnetic resistance magnetic image recognition sensor |
| CN103927811B (en) * | 2014-03-25 | 2016-09-14 | 江苏多维科技有限公司 | A kind of magneto-resistor magnetic picture identification sensor |
| US10598743B2 (en) | 2014-03-25 | 2020-03-24 | Multidimension Technology Co., Ltd | Magnetoresistive magnetic imaging sensor |
| CN106461740A (en) * | 2014-05-13 | 2017-02-22 | 三菱电机株式会社 | Magnetic sensor device |
| CN106461740B (en) * | 2014-05-13 | 2019-03-29 | 三菱电机株式会社 | Magnetic sensor device |
| CN104134269A (en) * | 2014-06-23 | 2014-11-05 | 江苏多维科技有限公司 | Coin detection system |
| US10777031B2 (en) | 2014-06-23 | 2020-09-15 | MultiDimension Technology Co., Ltd. | Coin detection system |
| CN106206934A (en) * | 2016-07-14 | 2016-12-07 | 长春禹衡光学有限公司 | A kind of gear type sensor module based on magnetoresistive chip and method for packing thereof |
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