CN104167043A - Chip-type weak magnetic detection sensor - Google Patents

Chip-type weak magnetic detection sensor Download PDF

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Publication number
CN104167043A
CN104167043A CN201310185697.XA CN201310185697A CN104167043A CN 104167043 A CN104167043 A CN 104167043A CN 201310185697 A CN201310185697 A CN 201310185697A CN 104167043 A CN104167043 A CN 104167043A
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CN
China
Prior art keywords
magnetic
chip
permanent magnet
measurement sensor
bias unit
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Application number
CN201310185697.XA
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Chinese (zh)
Inventor
刘乐杰
时启猛
曲炳郡
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北京嘉岳同乐极电子有限公司
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Priority to CN201310185697.XA priority Critical patent/CN104167043A/en
Publication of CN104167043A publication Critical patent/CN104167043A/en

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Abstract

The invention provides a chip-type weak magnetic detection sensor which comprises a chip for sensing magnetic identification arranged in an object to be detected and outputting differential signals; a permanent magnet for magnetizing the magnetic identification, the chip being arranged in a middle region above the permanent magnet; and a magnetic bias unit for changing the magnetic field of the permanent magnet. The magnetic bias unit is made of magnetic-conductive materials; the magnetic bias unit is provided with a recess portion; and the permanent magnet is arranged in the recess portion. The chip-type weak magnetic detection sensor is high in sensitivity, strong in anti-interference capability, and low in cost.

Description

The weak magnetic measurement sensor of a kind of chip type

Technical field

The invention belongs to precision measurement field, be 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 bill checkout equipment, for distinguishing the true and false of the object to be detected such as banknote, bill.Along with the progress of technology, on market, there is chip type Magnetic Sensor, its have highly sensitive, cost is low, volume is little, the plurality of advantages such as easy of integration, has therefore replaced gradually traditional coil type Magnetic Sensor.

Chip type Magnetic Sensor is the true and false that monitored thing is distinguished in the magnetic field of responding to the magnetic mark of being located in object to be detected by chip.In object to be detected, be not only provided with Hard Magnetic mark, be also provided with soft magnetism mark, to improve the anti-counterfeit capability of object to be detected.But, after being only magnetized, soft magnetism mark could be responded to by chip.For this reason, chip type Magnetic Sensor also comprises the permanent magnet for magnetizing soft magnetism mark.Permanent magnet is in magnetization soft magnetism mark, and the magnetic field that is parallel to chip sensitive surface of its generation can affect the sensitivity of chip, has reduced the sensitivity of chip type Magnetic Sensor.

Summary of the invention

The technical problem to be solved in the present invention is exactly for the above-mentioned defect existing in precision measuring instrument, provides a kind of chip type weak magnetic measurement sensor, and it can eliminate the impact of permanent magnet on chip, to improve its sensitivity.

For this reason, the invention provides the weak magnetic measurement sensor of a kind of chip type, comprising:

Chip, for responding to magnetic mark the output difference sub-signal be located in object to be detected;

Permanent magnet, for magnetizing described magnetic mark, described chip is placed in the zone line of described permanent magnet top;

Magnetic bias unit, for changing the Distribution of Magnetic Field of described permanent magnet;

It is characterized in that, described magnetic bias unit adopts permeability magnetic material to make, and on described magnetic bias unit, is provided with recess, and described permanent magnet is located in 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 mate with outline and the outside dimension of described permanent magnet respectively, and described permanent magnet is embedded in described recess.

Wherein, described permanent magnet is structure as a whole.

Wherein, described permanent magnet comprises multiple permanent magnetic monomers, and described multiple permanent magnetic monomers are arranged in 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 are placed in described housing.

Wherein, comprise the housing that permalloy is made, on described housing, be provided with opening, described chip, described permanent magnet and described magnetic bias unit are placed in described housing, and the sensitive surface of described chip is relative with described opening.

Wherein, comprise wiring board, input end, the output terminal of described chip 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 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 GMR film.

The present invention has following beneficial effect:

The weak magnetic measurement sensor of chip type provided by the invention, 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, reduce the horizontal component in chip position magnetic field, expand ideal zone, thereby reduced the impact of permanent magnet on 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.

Brief description of the drawings

Fig. 1 is the schematic diagram of the weak magnetic measurement sensor of embodiment of the present invention 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 to 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 the distribution curve of the permanent magnet grown of length in its length direction magnetic field intensity;

Fig. 4 b is the distribution curve of the permanent magnet grown of length that forms of permanent magnetic monomers in its length direction magnetic field intensity;

Fig. 5 is the vertical view of polylith permanent magnetic monomers being arranged to the permanent magnet forming and is embedded at magnetic bias unit;

Fig. 6 is the structural representation of the housing of the weak magnetic measurement sensor of embodiment of the present invention chip type;

Fig. 7 a is the structural representation of the weak magnetic measurement sensor of another embodiment of the present invention chip type;

Fig. 7 b is the structural representation of the weak magnetic measurement sensor of yet another embodiment of the invention chip type.

Embodiment

For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with accompanying drawing to chip type provided by the invention a little less than magnetic measurement sensor be described in detail.

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 are placed in housing 15, and fix with resin.Chip 11 is for responding to magnetic mark the output difference sub-signal be located in object to be detected, 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.The wiring board pad that is provided with wiring and is electrically connected with described wiring on wiring board 12, and two wiring board pads of each wiring electrical connection.Utilize wire that chip bonding pad is electrically connected with corresponding wiring board pad, thereby chip 11 is electrically connected with wiring board 12.Capillary 16 electrical connection corresponding to wiring board pad, capillary 16 is connected with input end, the output terminal of chip by wiring board 12, utilizes capillary 16 that other parts such as magnetic measurement sensor a little less than chip type and such as processor etc. are electrically connected.

Inductive magnetic thin film can be giant magnetoresistance magnetic susceptibility (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 giant Hall effect film.Chip 11 and permanent magnet 13 are arranged at respectively the both sides up and down of wiring board 12.Permanent magnet 13 is for magnetizing the weak magnetic mark in object to be detected, so that weak magnetic mark produces the magnetic field that can be responded to by chip 11.The magnetic field producing at permanent magnet 13 above it distribution situation is: 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 apart from 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, the zone line directly over permanent magnet 13 is referred to as " ideal zone " by the present embodiment, and preferably chip 11 is arranged to ideal zone.

As shown in Figure 2 a, the magnetic line of force in the magnetic field that permanent magnet 13 produces is dispersed, and the zone line of permanent magnet 13 tops exists stronger magnetic-field component.As shown in Figure 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 of permanent magnet 13 and bottom surface, only exposes the face of permanent magnet 13 towards chip 11 1 sides.When permanent magnet 13 is located to 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, make the deflection magnetic bias unit 14, magnetic field that permanent magnet 13 produces or be imported into magnetic bias unit 14 to conduct, thereby can optimize the Distribution of Magnetic Field of permanent magnet 13.Particularly, as shown in Figure 2 b, magnetic bias unit 14 makes to exist the more close permanent magnet in magnetic field of horizontal component (being parallel to chip sensitive surface), and this has reduced permanent magnet 13 tops, the especially horizontal component in the magnetic field in the region of chip placement 11 on the one hand; 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, expand ideal zone simultaneously, thereby reduce the impact of permanent magnet 13 on chip 11.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 impact of permanent magnet 13 on chip 11, preferably the upper surface of permanent magnet 13 is not higher than the upper surface of magnetic bias unit 14, as the upper surface flush of the upper surface of permanent magnet 13 and magnetic bias unit 14, or the upper surface of permanent magnet 13 is lower than the upper surface of magnetic bias unit 14.Magnetic bias unit 14 can adopt permeability magnetic materials such as permalloy and make.

Preferably, the interior profile of recess 141 and internal diameter size mate with outline and the outside dimension of permanent magnet 13, permanent magnet 13 is embedded in recess 141, and make permanent magnet 13 and magnetic bias unit 14 close contacts, so that bias unit 14 retrains the magnetic field of permanent magnet 13 better, thereby further reduce the impact of permanent magnet 13 on chip 11 sensitivity.

As shown in Figure 3 a, in another embodiment, recess 141 is arranged to magnetic bias unit 14 away from chip 11 1 sides.Do not change direction through magnetic bias unit 14 perpendicular to the magnetic line of force on permanent magnet 13 surfaces, weak magnetic mark is magnetized; Exist the magnetic line of force of horizontal component to be subject to the constraint of magnetic bias unit 14, more close permanent magnet 13, has weakened the horizontal component in chip 11 magnetic fields, position.The magnetic line of force of permanent magnet 13 sides enters magnetic bias unit 14 and forms loop, has reduced the impact of permanent magnet 13 on chip 11, thereby improves the sensitivity of the weak magnetic measurement sensor of chip type.

As shown in Figure 3 b, again in an embodiment, magnetic bias unit 14 is arranged on to the side of permanent magnet 13 away from chip 11, the i.e. downside of permanent magnet 13 shown in figure, the magnetic bias unit 14 arranging like this can attract to exist the magnetic field of horizontal component equally, expands ideal zone, reduces the horizontal component in the magnetic field in the region of chip placement 11, thereby reduce the impact of permanent magnet 13 on chip 11, and then the sensitivity that improves the weak magnetic measurement sensor of chip type.

As shown in Figure 3 c, the degree of depth of recess 141 is less than the thickness of permanent magnet 13, the base section of four sides of permanent magnet 13 is 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 object of the magnetic line of force that attracts permanent magnet 13 equally, thereby reduce the impact of permanent magnet 13 on chip 11, and then the sensitivity that improves the weak magnetic measurement sensor of chip type.

Permanent magnet 13 can be structure as a whole, and also can in the plane that is parallel to chip sensitive surface, be arranged and form by polylith permanent magnetic monomers.Particularly, when the size of permanent magnet 13 hour, permanent magnet 13 surface longitudinal magnetic field distribution are more even, now can adopt the permanent magnet of integrative-structure.In the time that the size of permanent magnet 13 is larger, when as longer in the length of permanent magnet 13, permanent magnet 13 surface longitudinal magnetic field intensitys are at length direction skewness.As shown in Fig. 4 a, in figure, horizontal ordinate represents the horizontal range (mm) of permanent magnet, and ordinate represents magnetic field intensity (G).The longitudinal magnetic field intensity at permanent magnet 13 two ends is stronger, the longitudinal magnetic field intensity in centre position a little less than, this magnetizes the effect of weak magnetic mark by affecting permanent magnet 13, thereby affect the precision of magnetic measurement sensor a little less than chip type.Therefore, preferably adopt the permanent magnetic monomers 131 that polylith size is less to splice (arrangement) setting, as shown in Figure 5.As shown in Figure 4 b, the permanent magnet 13 being spliced can obtain the more uniform permanent magnet 13 of longitudinal magnetic field intensity, thereby improves the effect of the weak magnetic mark of permanent magnet 13 premagnetizations, and then can improve the precision of the weak magnetic measurement sensor of chip type.Preferably adjacent two permanent magnetic monomers close-packed arrays, adjacent two permanent magnetic monomers abut against together, make the gap minimum between adjacent two permanent magnetic monomers.Be understood that, in the time adopting the permanent magnet of polylith permanent magnetic monomers splicing, permanent magnetic monomers can be arranged at the length direction of permanent magnet 13 or Width, more preferably arranges at length direction.

In the present embodiment, housing 15 adopts permalloy to make, and the housing 15 of being made by permalloy can shield the interference to chip 11 of magnetic field in external environment effectively.As shown in Figure 6, be provided with opening 151 on housing 15, housing 15 is penetrated with magnetic mark a little less than premagnetization through opening 151 in the magnetic field of permanent magnet 13.Chip 11 being fixed on to housing 15 when interior, the sensitive surface of chip is relative with opening 151.Certainly, housing 15 also can adopt the metal such as copper, aluminium to make, or adopts plastic production.It is pointed out that in the time 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, 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.But magnetic bias of the present invention unit 14 can also be embedded in wiring board 12.Particularly, as shown in Fig. 7 a and Fig. 7 b, through hole 121 is set on wiring board 12, permanent magnet 13 is arranged to recess 141, magnetic bias unit 14 is embedded in through hole 121, be that magnetic bias unit 14 stretches into through hole 121 from the below of wiring board 12, and the upper surface that makes magnetic bias unit 14 is not higher than the upper surface of wiring board 12.The preferably upper surface of magnetic bias unit 14 and the upper surface flush of wiring board 12, is beneficial to the assembling of the weak magnetic measurement sensor of chip type.The upper surface that it is pointed out that magnetic bias unit 14 also can reduce the impact of permanent magnet 13 on chip 11 higher than the upper surface of wiring board 12.Fig. 7 a illustrated embodiment is that part magnetic bias unit 14 is embedded in through hole 121, between chip 11 and permanent magnet 13, is isolated by wiring board 12.Fig. 7 b illustrated embodiment is that magnetic bias unit 14 is all embedded in through hole 121, in this case, first chip 11 is encapsulated, and is then located at the upper surface of permanent magnet 13, 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 chip type that above-described embodiment provides can be for cash inspecting machine, ATM, for distinguishing the pick-up unit of papers, and it is arranged on magnetic in object to be detected and is identified to distinguish the true and false of object to be detected by detection.

The weak magnetic measurement sensor of chip type that the present embodiment provides, 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, reduce the horizontal component in chip position magnetic field, expand ideal zone, thereby reduced the impact of permanent magnet on 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 is only used to principle of the present invention is described and the illustrative embodiments that adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.

Claims (12)

1. the weak magnetic measurement sensor of chip type, is characterized in that, comprising:
Chip, for responding to magnetic mark the output difference sub-signal be located in object to be detected;
Permanent magnet, for magnetizing described magnetic mark, described chip is placed in the zone line of described permanent magnet top;
Magnetic bias unit, for changing the Distribution of Magnetic Field of described permanent magnet;
It is characterized in that, described magnetic bias unit adopts permeability magnetic material to make, and on described magnetic bias unit, is provided with recess, and described permanent magnet is located in 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 mate with outline and the outside dimension of described permanent magnet respectively, and described permanent magnet is embedded in 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 multiple permanent magnetic monomers, and described multiple permanent magnetic monomers are arranged in 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 are placed in 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, on described housing, be provided with opening, described chip, described permanent magnet and described magnetic bias unit are placed in 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 input end, the output terminal of described chip and the wiring board pad of being located at described wiring board are electrically connected.
The weak magnetic measurement sensor of 11. chip types according to claim 10, is characterized in that, described wiring board is provided with through hole, and described magnetic bias unit is embedded in described through hole.
The weak magnetic measurement sensor of 12. chip types according to claim 1, is characterized in that, 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 GMR film.
CN201310185697.XA 2013-05-17 2013-05-17 Chip-type weak magnetic detection sensor CN104167043A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105116356A (en) * 2015-09-27 2015-12-02 电子科技大学中山学院 Magnetic field sensor
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
CN106371141A (en) * 2016-04-12 2017-02-01 苏州保瑟佳货币检测科技有限公司 Semiconductor magnetic head, soft magnetic detection device and magnetic head preparation method

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CN102968845A (en) * 2012-10-31 2013-03-13 江苏多维科技有限公司 Magnetic-bias currency detecting magnetic head with sensitive direction parallel to detection face
CN203224930U (en) * 2013-05-17 2013-10-02 北京嘉岳同乐极电子有限公司 Chip type weak magnetism detection sensor
JP2014149268A (en) * 2013-02-04 2014-08-21 Yokogawa Electric Corp Magnetic detector

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63314479A (en) * 1987-03-18 1988-12-22 Sprague Electric Co Proximity detector
JP2001004728A (en) * 1999-09-02 2001-01-12 Akita Prefecture Magnetism detecting apparatus
CN1426530A (en) * 2000-02-26 2003-06-25 罗伯特-博希股份公司 Measuring device for contactlessly detecting ferromagnetic object
CN1930451A (en) * 2004-03-11 2007-03-14 罗伯特·博世有限公司 Magnet sensor arrangement
CN2788259Y (en) * 2005-04-15 2006-06-14 福建省电影机械厂 Huge magnetic resistance sensor of paper money counter
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105116356A (en) * 2015-09-27 2015-12-02 电子科技大学中山学院 Magnetic field sensor
CN106371141A (en) * 2016-04-12 2017-02-01 苏州保瑟佳货币检测科技有限公司 Semiconductor magnetic head, soft magnetic detection device and magnetic head preparation method
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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Application publication date: 20141126