CN203224930U - Chip type weak magnetism detection sensor - Google Patents
Chip type weak magnetism detection sensor Download PDFInfo
- Publication number
- CN203224930U CN203224930U CN2013202726540U CN201320272654U CN203224930U CN 203224930 U CN203224930 U CN 203224930U CN 2013202726540 U CN2013202726540 U CN 2013202726540U CN 201320272654 U CN201320272654 U CN 201320272654U CN 203224930 U CN203224930 U CN 203224930U
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- magnetic
- permanent magnet
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- measurement sensor
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Abstract
The utility model provides a chip type weak magnetism detection sensor. The chip type weak magnetism detection sensor comprises a chip, a permanent magnet and a magnetic bias unit, wherein the chip is used for inducing a magnetic identification arranged inside an object to be detected, the permanent magnet is used for magnetizing the magnetic identification, the chip is arranged in a middle area above the permanent magnet, the magnetic bias unit is used for changing the magnetic field of the permanent magnet and is made of magnetism conductive materials, a concave portion is formed in the magnetic bias unit, and the permanent magnet is arranged inside the concave portion. The chip type weak magnetism detection sensor is high in sensitivity, strong in anti-jamming capability, and low in cost.
Description
Technical field
The utility model belongs to the precision measurement field, is specifically related to the weak magnetic measurement sensor of a kind of chip type.
Background technology
Magnetic Sensor is widely used in the middle of cash inspecting machine, ATM and the bill checkout equipment, is used for distinguishing the true and false of objects to be detected such as banknote, bill.Along with development of technology, the chip type Magnetic Sensor has appearred on the market, its have highly sensitive, cost is low, volume is little, plurality of advantages such as easy of integration, has therefore replaced traditional coil type Magnetic Sensor gradually.
The chip type Magnetic Sensor is the true and false of distinguishing monitored thing by the magnetic field that the magnetic sign in the object to be detected is located in chip induction.In object to be detected, not only be provided with the Hard Magnetic sign, also be provided with the soft magnetism sign, to improve the anti-counterfeit capability of object to be detected.Yet, could be responded to by chip after the soft magnetism sign only is magnetized.For this reason, the chip type Magnetic Sensor also comprises the permanent magnet for magnetization soft magnetism sign.Permanent magnet is in magnetization soft magnetism sign, and the magnetic field that is parallel to the chip sensitive surface of its generation can influence the sensitivity of chip, has reduced the sensitivity of chip type Magnetic Sensor.
The utility model content
The technical problems to be solved in the utility model is exactly at the above-mentioned defective that exists in the precision measuring instrument, provides a kind of chip type weak magnetic measurement sensor, and it can eliminate permanent magnet to the influence of chip, to improve its sensitivity.
For this reason, the utility model provides a kind of chip type weak magnetic measurement sensor, comprising:
Chip is used for induction and is located at the magnetic sign in the object to be detected and exports differential signal;
Permanent magnet is used for the described magnetic sign of magnetization, and described chip places the zone line of described permanent magnet top;
The magnetic bias unit is for the Distribution of Magnetic Field that changes described permanent magnet;
It is characterized in that described magnetic bias unit adopts permeability magnetic material to make, and is provided with recess in described magnetic bias unit, described permanent magnet is located in the described recess.
Wherein, described recess is arranged near described chip one side or away from described chip one side.
Wherein, the upper surface of described permanent magnet is not higher than the upper surface of described magnetic bias unit.
Wherein, the interior profile of described recess and internal diameter size respectively with the outline of described permanent magnet and outside dimension coupling, described permanent magnet is embedded in the described recess.
Wherein, described permanent magnet is structure as a whole.
Wherein, described permanent magnet comprises a plurality of permanent magnetic monomers, and described a plurality of permanent magnetic monomers are arranged on the plane that is parallel to sensitive surface.
Wherein, described permanent magnet is arranged along described permanent magnet length direction.
Wherein, comprise the housing that adopts metal or plastic production, described chip, described permanent magnet and described magnetic bias unit place in the described housing.
Wherein, comprise the housing that permalloy is made, be provided with opening at described housing, described chip, described permanent magnet and described magnetic bias unit place in the described housing, and the sensitive surface of described chip is relative with described opening.
Wherein, comprise wiring board, the input end of described chip, output terminal and the wiring board pad of being located at described wiring board are electrically connected.
Wherein, described wiring board is provided with through hole, and described magnetic bias unit is embedded in the described through hole.
Wherein, described chip comprises inductive magnetic thin film and chip bonding pad, and described chip bonding pad is electrically connected with described inductive magnetic thin film, and described inductive magnetic thin film is the GMR film.
The utlity model has following beneficial effect:
The weak magnetic measurement sensor of the chip type that the utility model provides, the magnetic bias unit adopts permeability magnetic material to make, permanent magnet is located in the recess of magnetic bias unit, there is the magnetic field of horizontal component in the constraint of magnetic bias unit, reduced the horizontal component in chip position magnetic field, enlarge ideal zone, thereby reduced the influence of permanent magnet to chip, and then improved the sensitivity of the weak magnetic measurement sensor of chip type; Reduced the assembly difficulty of sensor simultaneously.In addition, can shield and exist the external magnetic field of horizontal component to enter ideal zone, improve the antijamming capability of the weak magnetic measurement sensor of chip type.
Description of drawings
Fig. 1 is the synoptic diagram of the weak magnetic measurement sensor of the utility model embodiment chip type;
Fig. 2 a is the magnetic line of force distribution schematic diagram in the magnetic field of permanent magnet generation;
Fig. 2 b is when permanent magnet is located at the recess of magnetic bias unit, the magnetic line of force distribution schematic diagram in the magnetic field that permanent magnet produces;
Fig. 3 a is the structural representation of another embodiment magnetic bias unit and permanent magnet;
Fig. 3 b is again the structural representation of an embodiment magnetic bias unit and permanent magnet;
Fig. 3 c is the structural representation of another embodiment magnetic bias unit and permanent magnet;
Fig. 4 a is that the long permanent magnet of length is at the distribution curve of its length direction magnetic field intensity;
Fig. 4 b is that the long permanent magnet of the length of permanent magnetic monomers formation is at the distribution curve of its length direction magnetic field intensity;
Fig. 5 is for arranging the vertical view that the permanent magnet that forms is embedded at the magnetic bias unit with the polylith permanent magnetic monomers;
Fig. 6 is the structural representation of the housing of the weak magnetic measurement sensor of the utility model embodiment chip type;
Fig. 7 a is the structural representation of the weak magnetic measurement sensor of another embodiment chip type of the utility model;
Fig. 7 b is the utility model structural representation of the weak magnetic measurement sensor of an embodiment chip type again.
Embodiment
For making those skilled in the art understand the technical solution of the utility model better, magnetic measurement sensor is described in detail a little less than the chip type that the utility model is provided below in conjunction with accompanying drawing.
As shown in Figure 1, the weak magnetic measurement sensor of chip type comprises chip 11, wiring board 12, permanent magnet 13, magnetic bias unit 14, housing 15 and capillary 16.Chip 11, wiring board 12, permanent magnet 13 and magnetic bias unit 14 place in the housing 15, and fix with resin.Chip 11 is used for induction to be located at the magnetic sign in the object to be detected and to export differential signal, and it comprises inductive magnetic thin film and chip bonding pad, and chip bonding pad is electrically connected with inductive magnetic thin film as input end and the output terminal of chip.Be provided with the wiring board pad that connects up and be electrically connected with described wiring at wiring board 12, and each bar wiring is electrically connected two wiring board pads.Utilize lead that chip bonding pad is electrically connected with corresponding wiring board pad, thereby chip 11 is electrically connected with wiring board 12.The corresponding electrical connection with the wiring board pad of capillary 16, capillary 16 is connected with input end, the output terminal of chip by wiring board 12, utilize capillary 16 with magnetic measurement sensor a little less than the chip type be electrically connected such as other parts such as processors.
Inductive magnetic thin film can be giant magnetoresistance magnetosensitive sense (GMR) film, anisotropic magnetoresistive magnetic sensitive film, tunneling effect magnetic resistance magnetic sensitive film, giant magnetoresistance effect magnetic resistance magnetic sensitive film, Hall effect film or huge Hall effect film.Chip 11 and permanent magnet 13 are arranged at the both sides up and down of wiring board 12 respectively.Permanent magnet 13 is used for the weak magnetic sign in the magnetization object to be detected, so that weak magnetic sign produces the magnetic field that can be responded to by chip 11.Distribution situation is above it in magnetic field that permanent magnet 13 produces: at the zone line of permanent magnet 13, magnetic field is mainly perpendicular to the surface of permanent magnet, the horizontal component in magnetic field is very little, and along with the increase on distance permanent magnet 13 surfaces, the horizontal component in magnetic field can increase to some extent; At the fringe region of permanent magnet 13, magnetic inclination distributes, and the horizontal component in magnetic field strengthens.Therefore, present embodiment is referred to as " ideal zone " with the zone line directly over the permanent magnet 13, and preferably chip 11 is arranged at ideal zone.
Shown in Fig. 2 a, the magnetic line of force in the magnetic field that permanent magnet 13 produces is dispersed, and there is stronger magnetic-field component in the zone line of permanent magnet 13 tops.Shown in Fig. 2 b, magnetic bias unit 14 is provided with recess 141 near chip 11 1 sides, and permanent magnet 13 is located in the recess 141 of magnetic bias unit 14.Magnetic bias unit 14 surrounds four sides and the bottom surface of permanent magnet 13, only exposes permanent magnet 13 towards the face of chip 11 1 sides.When permanent magnet 13 is located at the recess 141 of magnetic bias unit 14, magnetic bias unit 14 has the characteristic that attracts magnetic field, can retrain the magnetic field of permanent magnet 13, the magnetic field that permanent magnet 13 is produced is partial to magnetic bias unit 14 or is imported into 14 conduction of magnetic bias unit, thereby can optimize the Distribution of Magnetic Field of permanent magnet 13.Particularly, shown in Fig. 2 c, magnetic bias unit 14 makes the more close permanent magnets in magnetic field that have horizontal component (being parallel to the chip sensitive surface), and this has reduced permanent magnet 13 tops on the one hand, has especially placed the horizontal component in magnetic field in the zone of chip 11; On the other hand, spread to the periphery in the magnetic field that has suppressed permanent magnet 13 edges, and two aspects all can reduce the magnetic field of the horizontal component of ideal zone, enlarge ideal zone simultaneously, thereby reduce the influence of 13 pairs of chips 11 of permanent magnet.In addition, the expansion of ideal zone has reduced the difficulty of the weak magnetic measurement sensor of assembling chip type, thereby reduces the cost of the weak magnetic measurement sensor of chip type.In addition, magnetic bias unit 14 can also shield and exist the external magnetic field of horizontal component to enter ideal zone, improves the antijamming capability of the weak magnetic measurement sensor of chip type.In order more preferably to reduce the influence of 13 pairs of chips 11 of permanent magnet, the upper surface of preferred permanent magnet 13 is not higher than the upper surface of magnetic bias unit 14, as the upper surface flush of upper surface and the magnetic bias unit 14 of permanent magnet 13, perhaps, the upper surface of permanent magnet 13 is lower than the upper surface of magnetic bias unit 14.Magnetic bias unit 14 can adopt such as permeability magnetic materials such as permalloys and make.
Preferably, the outline of the interior profile of recess 141 and internal diameter size and permanent magnet 13 and outside dimension coupling, permanent magnet 13 is embedded in the recess 141, and permanent magnet 13 is closely contacted with magnetic bias unit 14, so that bias unit 14 retrains the magnetic field of permanent magnet 13 better, thereby further reduce the influence of 13 pairs of chip 11 sensitivity of permanent magnet.
Shown in Fig. 3 a, in another embodiment, recess 141 is arranged at magnetic bias unit 14 away from chip 11 1 sides.Do not change direction perpendicular to the magnetic line of force on permanent magnet 13 surfaces and pass magnetic bias unit 14, weak magnetic sign is magnetized; Exist the magnetic line of force of horizontal component to be subjected to the constraint of magnetic bias unit 14, more close permanent magnet 13 has weakened the horizontal component in magnetic field, chip 11 position.The magnetic line of force of permanent magnet 13 sides enters magnetic bias unit 14 and forms the loop, has reduced the influence of 13 pairs of chips 11 of permanent magnet, thereby improves the sensitivity of the weak magnetic measurement sensor of chip type.
Shown in Fig. 3 b, again among the embodiment, magnetic bias unit 14 is arranged on permanent magnet 13 away from a side of chip 11, the i.e. downside of permanent magnet shown in the figure 13, the magnetic bias unit 14 of She Zhiing can attract to exist the magnetic field of horizontal component equally like this, enlarges ideal zone, reduces to place the horizontal component in magnetic field in the zone of chip 11, thereby reduce the influence of 13 pairs of chips 11 of permanent magnet, and then improve the sensitivity of the weak magnetic measurement sensor of chip type.
Shown in Fig. 3 c, the degree of depth of recess 141 is less than the thickness of permanent magnet 13, make the base section of four sides of permanent magnet 13 be surrounded by magnetic bias unit 14, the top section of the side of permanent magnet 13 is exposed, magnetic bias unit 14 can reach the purpose of the magnetic line of force that attracts permanent magnet 13 equally, thereby reduce the influence of 13 pairs of chips 11 of permanent magnet, and then improve the sensitivity of the weak magnetic measurement sensor of chip type.
In the present embodiment, housing 15 adopts permalloys to make, and the housing of being made by permalloy 15 can shield magnetic field in the external environment effectively to the interference of chip 11.As shown in Figure 6, be provided with opening 151 at housing 15, the magnetic field of permanent magnet 13 is passed opening 151 and is penetrated housing 15 with magnetic sign a little less than the premagnetization.When being fixed in chip 11 in the housing 15, the sensitive surface of chip is relative with opening 151.Certainly, housing 15 also can adopt metals such as copper, aluminium to make, and perhaps adopts plastic production.It is pointed out that when adopting metal or plastic production housing 15, opening 151 can be set, thereby can reduce the cost of manufacture of housing 15.On housing 15, earth terminal 152 can also be set, be used for eliminating static.
In the above-described embodiments, chip 11 and magnetic bias unit 14 both sides up and down of wiring board 12 that are placed in.Yet the utility model magnetic bias unit 14 can also be embedded in the wiring board 12.Particularly, shown in Fig. 7 a and Fig. 7 b, at wiring board 12 through hole 121 is set, permanent magnet 13 is arranged at recess 141, magnetic bias unit 14 is embedded in the through hole 121, be that magnetic bias unit 14 stretches into through hole 121 from the below of wiring board 12, and make the upper surface of magnetic bias unit 14 not be higher than the upper surface of wiring board 12.The upper surface of preferred magnetic bias unit 14 and the upper surface flush of wiring board 12 are beneficial to the assembling of the weak magnetic measurement sensor of chip type.The upper surface that the upper surface that it is pointed out that magnetic bias unit 14 is higher than wiring board 12 also can reduce the influence of 13 pairs of chips 11 of permanent magnet.Fig. 7 a illustrated embodiment is that part magnetic bias unit 14 is embedded in the through hole 121, is isolated by wiring board 12 between chip 11 and the permanent magnet 13.Fig. 7 b illustrated embodiment is that magnetic bias unit 14 all is embedded in the through hole 121, in this case, at first with chip 11 encapsulation, is located at the upper surface of permanent magnet 13 then, namely by the encapsulation of chip 11 chip 11 and permanent magnet 13 is isolated.Housing 15 adopts permalloy to make, and housing 15 is provided with opening 151, and makes chip 11 relative with opening 151.
The weak magnetic measurement sensor of the chip type that above-described embodiment provides can be used for cash inspecting machine, ATM, for the pick-up unit of distinguishing papers, it is arranged on the true and false that magnetic in the object to be detected identifies to distinguish object to be detected by detection.
The weak magnetic measurement sensor of the chip type that present embodiment provides, the magnetic bias unit adopts permeability magnetic material to make, permanent magnet is located in the recess of magnetic bias unit, there is the magnetic field of horizontal component in the constraint of magnetic bias unit, reduced the horizontal component in chip position magnetic field, enlarge ideal zone, thereby reduced the influence of permanent magnet to chip, and then improved the sensitivity of the weak magnetic measurement sensor of chip type; Reduce the assembly difficulty of sensor simultaneously, thereby reduced cost of manufacture.In addition, can shield and exist the external magnetic field of horizontal component to enter ideal zone, improve the antijamming capability of the weak magnetic measurement sensor of chip type.
Be understandable that above embodiment only is the illustrative embodiments that adopts for principle of the present utility model is described, yet the utility model is not limited thereto.For those skilled in the art, under the situation that does not break away from spirit of the present utility model and essence, can make various modification and improvement, these modification and improvement also are considered as protection domain of the present utility model.
Claims (12)
1. the weak magnetic measurement sensor of chip type is characterized in that, comprising:
Chip is used for induction and is located at the magnetic sign in the object to be detected and exports differential signal;
Permanent magnet is used for the described magnetic sign of magnetization, and described chip places the zone line of described permanent magnet top;
The magnetic bias unit is for the Distribution of Magnetic Field that changes described permanent magnet;
It is characterized in that described magnetic bias unit adopts permeability magnetic material to make, and is provided with recess in described magnetic bias unit, described permanent magnet is located in the described recess.
2. the weak magnetic measurement sensor of chip type according to claim 1 is characterized in that described recess is arranged near described chip one side or away from described chip one side.
3. the weak magnetic measurement sensor of chip type according to claim 1 is characterized in that the upper surface of described permanent magnet is not higher than the upper surface of described magnetic bias unit.
4. the weak magnetic measurement sensor of chip type according to claim 1 is characterized in that, the interior profile of described recess and internal diameter size respectively with outline and the outside dimension coupling of described permanent magnet, described permanent magnet is embedded in the described recess.
5. the weak magnetic measurement sensor of chip type according to claim 1 is characterized in that described permanent magnet is structure as a whole.
6. the weak magnetic measurement sensor of chip type according to claim 1 is characterized in that described permanent magnet comprises a plurality of permanent magnetic monomers, and described a plurality of permanent magnetic monomers are arranged on the plane that is parallel to sensitive surface.
7. the weak magnetic measurement sensor of chip type according to claim 6 is characterized in that described permanent magnet is arranged along described permanent magnet length direction.
8. the weak magnetic measurement sensor of chip type according to claim 1 is characterized in that, comprise the housing that adopts metal or plastic production, described chip, described permanent magnet and described magnetic bias unit place in the described housing.
9. the weak magnetic measurement sensor of chip type according to claim 1, it is characterized in that, comprise the housing that permalloy is made, be provided with opening at described housing, described chip, described permanent magnet and described magnetic bias unit place in the described housing, and the sensitive surface of described chip is relative with described opening.
10. the weak magnetic measurement sensor of chip type according to claim 1 is characterized in that, comprises wiring board, and the input end of described chip, output terminal and the wiring board pad of being located at described wiring board are electrically connected.
11. the weak magnetic measurement sensor of chip type according to claim 10 is characterized in that described wiring board is provided with through hole, described magnetic bias unit is embedded in the described through hole.
12. the weak magnetic measurement sensor of chip type according to claim 1 is characterized in that described chip comprises inductive magnetic thin film and chip bonding pad, described chip bonding pad is electrically connected with described inductive magnetic thin film, and described inductive magnetic thin film is the GMR film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202726540U CN203224930U (en) | 2013-05-17 | 2013-05-17 | Chip type weak magnetism detection sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202726540U CN203224930U (en) | 2013-05-17 | 2013-05-17 | Chip type weak magnetism detection sensor |
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| Publication Number | Publication Date |
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| CN203224930U true CN203224930U (en) | 2013-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013202726540U Expired - Lifetime CN203224930U (en) | 2013-05-17 | 2013-05-17 | Chip type weak magnetism detection sensor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103942872A (en) * | 2014-04-18 | 2014-07-23 | 江苏多维科技有限公司 | Small-fly-height inner-face magnetic image recognition sensor chip |
| CN104167043A (en) * | 2013-05-17 | 2014-11-26 | 北京嘉岳同乐极电子有限公司 | Chip-type weak magnetic detection sensor |
| CN104569869A (en) * | 2013-10-21 | 2015-04-29 | 北京嘉岳同乐极电子有限公司 | Magnetic sensor |
| CN104574631A (en) * | 2013-10-11 | 2015-04-29 | 北京嘉岳同乐极电子有限公司 | Magnetic modulation device and magnetic sensor |
| CN104793152A (en) * | 2014-01-16 | 2015-07-22 | 北京嘉岳同乐极电子有限公司 | High-sensitivity chip sensor |
| CN104835614A (en) * | 2015-05-29 | 2015-08-12 | 李丽霞 | Combined type magnet and magnetic sensor with the same |
| JP2016125860A (en) * | 2014-12-26 | 2016-07-11 | セイコーＮｐｃ株式会社 | Method of positioning magnet in magnetic line sensor, and positioning device |
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2013
- 2013-05-17 CN CN2013202726540U patent/CN203224930U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167043A (en) * | 2013-05-17 | 2014-11-26 | 北京嘉岳同乐极电子有限公司 | Chip-type weak magnetic detection sensor |
| CN104574631A (en) * | 2013-10-11 | 2015-04-29 | 北京嘉岳同乐极电子有限公司 | Magnetic modulation device and magnetic sensor |
| CN104569869A (en) * | 2013-10-21 | 2015-04-29 | 北京嘉岳同乐极电子有限公司 | Magnetic sensor |
| CN104569869B (en) * | 2013-10-21 | 2018-11-02 | 北京嘉岳同乐极电子有限公司 | Magnetic sensor |
| CN104793152A (en) * | 2014-01-16 | 2015-07-22 | 北京嘉岳同乐极电子有限公司 | High-sensitivity chip sensor |
| CN104793152B (en) * | 2014-01-16 | 2019-02-15 | 北京嘉岳同乐极电子有限公司 | A kind of highly sensitive chip sensor |
| CN103942872A (en) * | 2014-04-18 | 2014-07-23 | 江苏多维科技有限公司 | Small-fly-height inner-face magnetic image recognition sensor chip |
| CN103942872B (en) * | 2014-04-18 | 2016-08-24 | 江苏多维科技有限公司 | Magnetic picture identification sensor chip in a kind of low fly height face |
| JP2016125860A (en) * | 2014-12-26 | 2016-07-11 | セイコーＮｐｃ株式会社 | Method of positioning magnet in magnetic line sensor, and positioning device |
| CN104835614A (en) * | 2015-05-29 | 2015-08-12 | 李丽霞 | Combined type magnet and magnetic sensor with the same |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20131002 |
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| CX01 | Expiry of patent term |