CN103632431B - magnetic image sensor and false distinguishing method - Google Patents
magnetic image sensor and false distinguishing method Download PDFInfo
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- CN103632431B CN103632431B CN201210297794.3A CN201210297794A CN103632431B CN 103632431 B CN103632431 B CN 103632431B CN 201210297794 A CN201210297794 A CN 201210297794A CN 103632431 B CN103632431 B CN 103632431B
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Abstract
The present invention provides a kind of magnetic image sensor and false distinguishing method.Magnetic image sensor includes magnetic sensor chip, it is characterized in that, the magnetic sensor chip includes the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, angle theta between the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix is 0 180 ° of ＜ θ ＜, the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix include N number of and M magnetic susceptibility unit respectively, the magnetic susceptibility unit is the wheatstone bridge circuits made by magnetic sensitive film, wherein, N, M are >=1 integer.The magnetic image sensor can carry out magnetic imaging to the magnetic stripe or magnetic dot of two dimensional surface, so as to realize two-dimentional false distinguishing demand.
Description
Technical field
The invention belongs to magnetic sensor technologies field, and in particular to a kind of counterfeit institution magnetic image sensor and its making side
Method.
Background technology
Sensing unit in Magnetic Sensor is to the magnetic variation as caused by the change such as magnetic field, electric current, ess-strain, temperature, light
There is sensitization, i.e. magnetic variationization can cause the magnetic property of sensing unit to change.The magnetic property of sensing unit is changed into conversion
Into electric signal, the value of the physical quantitys such as corresponding earth's magnetic field, electric current, ess-strain, temperature or light can be obtained by measuring electric signal.
Because small magnetic variationization all can cause the magnetic property of sensing unit to change.Therefore, Magnetic Sensor is widely used in navigating
Sky, space flight, microelectronics, geological exploration, medical imaging, information gathering and military contour delicate fields.
At present, the Magnetic Sensor being widely used is coil-type magnetic sensor, i.e. sensing unit is coil.Fig. 1 is existing
The sectional view for the Magnetic Sensor that financial fake identifying machine (the false distinguishing unit in such as cash inspecting machine or other financial machine and tool) uses.Such as Fig. 1 institutes
Show, Magnetic Sensor includes housing 101, magnetic core 105, coil 109 and printed circuit board 113.It is provided with and opens on the top of shell 101
Mouth 103.Magnetic core 105 includes the first magnetic core 105a and the second magnetic core 105b, the first magnetic core 105a and the second magnetic core 105b by branch
Frame 111 is fixed in housing 101.It is provided with convex portion at the first magnetic core 105a and the second magnetic core 105b top, convex portion is from opening 103
Stretch out outside housing 101.Magnetic gap 107 is provided with the center on the top of convex portion.Coil 109, line are provided with the lower section of magnetic gap 107
Circle 109 electrically connects with printed circuit board 113, and printed circuit board 113 passes through other systems (figure in capillary 114 and financial fake identifying machine
Not shown in) connection.
In use, the convex portion of magnetic core 105 is streaked from banknote magnetic oil ink-stick or magnetic metal bar surface.Due to magnetic gap
107 presence so that the magnetic field around coil 109 changes, so as to form induced electromotive force in coil 109.This is inducted
The size of electromotive force is proportional to the magnetic field intensity of banknote magnetic oil ink-stick or magnetic metal bar, can distinguish the true of banknote accordingly
It is pseudo-.
However, with note-printing technique development and avoid the appearance of counterfeit money, Yin Chao factories set in the two dimensional surface of banknote
Put it is multiple be used for false proof strong and weak different magnetic stripes or magnetic dot as recessive anti-fake mark, by the position for judging magnetic stripe and magnetic dot
Put, the length of magnetic strength and magnetic stripe differentiates the true and false of banknote.Existing financial fake identifying machine can only obtain one-dimensional square
The position of magnetic stripe or magnetic dot, but magnetic imaging can not be carried out to the magnetic stripe or magnetic dot for being arranged on two dimensional surface, it is additionally, since by coil
Volume and its limitation of sensitivity, existing authentication detection technology can not realize two-dimentional false distinguishing demand at all.
In addition, coil-type magnetic sensor also has, sensitivity is low, low-response, resolution ratio are low, stability and reliability are poor
The defects of, cause existing financial fake identifying machine not adapt to the development need of financial circles increasingly.
The content of the invention
The technical problem to be solved in the present invention is aiming at drawbacks described above existing for traditional Magnetic Sensor, there is provided a kind of magnetic chart
As sensor and false distinguishing method, it disclosure satisfy that two-dimentional false distinguishing demand.
The used technical scheme for solving above-mentioned technical problem is to provide a kind of magnetic image sensor, including Magnetic Sensor
Chip, the magnetic sensor chip include the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, first magnetosensitive
Angle theta between sense unit dot matrix and the second magnetic susceptibility unit dot matrix is 0 180 ° of ＜ θ ＜, the first magnetic susceptibility unit
Dot matrix and the second magnetic susceptibility unit dot matrix include N number of and M magnetic susceptibility unit respectively, and the magnetic susceptibility unit is by magnetosensitive
Feel the wheatstone bridge circuits that film makes, wherein, N, M are >=1 integer.
Wherein, the first magnetic susceptibility unit dot matrix includes the n × m magnetic susceptibility units, moreover, the magnetic susceptibility list
First laterally to set, m, n are >=1 integer；
The second magnetic susceptibility unit dot matrix includes a × b magnetic susceptibility units, moreover, the magnetic susceptibility unit is indulged
To setting, a, b are >=1 integer.
Wherein, the magnetic susceptibility unit includes the magnetic sensitive film that at least one pair of is parallel to each other and pinning is in opposite direction, and
And the spacing of the magnetic susceptibility unit is the distance between two described magnetic sensitive films, the symmetrical centre of the magnetic susceptibility unit
For the symmetrical centre of two magnetic sensitive films in its longitudinal direction.
Wherein, the spacing of n × m in the first magnetic susceptibility unit dot matrix magnetic susceptibility units is equal；Described
The spacing of a × b magnetic susceptibility units in two magnetic susceptibility unit dot matrix is equal.
Wherein, the spacing of n × m in the first magnetic susceptibility unit dot matrix magnetic susceptibility units is not completely equivalent；
The spacing of a × b magnetic susceptibility units in the second magnetic susceptibility unit dot matrix is not completely equivalent.
Wherein, the spacing of n × m in the first magnetic susceptibility unit dot matrix magnetic susceptibility units is equal；Described
The spacing of a × b magnetic susceptibility units in two magnetic susceptibility unit dot matrix is unequal；Or
The spacing of the n × m magnetic susceptibility units in the first magnetic susceptibility unit dot matrix is unequal；Second magnetic
The spacing of a × b magnetic susceptibility units in sensing unit dot matrix is equal.
Wherein, in the first magnetic susceptibility unit dot matrix, every each magnetic susceptibility unit in row magnetic susceptibility unit
Symmetrical centre is on the same line.
Wherein, in the first magnetic susceptibility unit dot matrix, every each magnetic susceptibility unit in row magnetic susceptibility unit
Symmetrical centre is not exclusively on the same line.
Wherein, in the second magnetic susceptibility unit dot matrix, each magnetic susceptibility unit in each column magnetic susceptibility unit
Symmetrical centre is on the same line.
Wherein, in the second magnetic susceptibility unit dot matrix, each magnetic susceptibility unit in each column magnetic susceptibility unit
Symmetrical centre is not exclusively on the same line.
Wherein, in the first magnetic susceptibility unit dot matrix, m arranges the magnetic susceptibility unit in the magnetic sensor chip
Gap is not present on horizontal direction, the transverse direction of the magnetic sensor chip is completely covered；
In the second magnetic susceptibility unit dot matrix, magnetic susceptibility unit described in a rows is by the longitudinal direction of the magnetic sensor chip
Gap is not present on direction, the longitudinal direction of the magnetic sensor chip is completely covered.
Wherein, in the first magnetic susceptibility unit dot matrix, m arranges the magnetic susceptibility unit in the magnetic sensor chip
Gap on horizontal direction be present；
In the second magnetic susceptibility unit dot matrix, magnetic susceptibility unit is in the longitudinal direction of the magnetic sensor chip described in a rows
Gap on direction be present.
Wherein, the wheatstone bridge circuits are favour stone half-bridge circuit, or, the wheatstone bridge circuits be favour this
Logical full-bridge circuit, each wheatstone bridge circuits are provided with a port difference.
Wherein, the magnetic sensitive film is continuous continual film.
Wherein, the magnetic sensitive film includes multistage film section, and the film section is by conductor series connection.
Wherein, the magnetic sensitive film is linear pattern film or the snakelike film of bending.
Wherein, the magnetic sensitive film is Hall effect film, anisotropic magnetoresistance film, giant magnet resistance film, tunnel
Road magneto-resistor film, giant magnetoresistance films or giant Hall effect film.
Wherein, in addition to printed circuit board, capillary, shielding shell and data processing unit,
The magnetosensitive sense chip electrically connects with the printed circuit board；
Magnetic conduction window is provided with the shielding shell, the magnetosensitive sense chip and the printed circuit board are arranged on described
Shield in shell, and the magnetic susceptibility unit is relative with the magnetic conduction window；
The printed circuit board is fixed in one end of the capillary, and with wheatstone bridge circuits in the magnetosensitive sense chip
Difference output end electrical connection
The data processing unit receives the differential signal of the wheatstone bridge circuits by the capillary, and according to institute
State differential signal and obtain magnetic marker.
Wherein, the shielding shell is made using Ferrite Material or permalloy material, or uses metal material system
Make, and the coating made in the coating of its surface by Ferrite Material or permalloy material.
The present invention also provides a kind of false distinguishing method, comprises the following steps：
Magnetic image sensor is obtained, the magnetic image sensor is magnetic image sensor provided by the invention；
Differential signal is obtained by the magnetic image sensor；
Magnetic marker is distinguished according to the differential signal, so as to the Distribution of Magnetic Field figure on thing surface to be checked.
The invention has the advantages that：
Magnetic image sensor provided by the invention, magnetic sensor chip therein include the first magnetic susceptibility unit dot matrix and the
Two magnetic susceptibility unit dot matrix, the angle theta between the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix are 0
180 ° of ＜ θ ＜, the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix include N number of and M magnetosensitive respectively
Feel unit, the magnetic susceptibility unit is the wheatstone bridge circuits made by magnetic sensitive film.Due to using magnetic sensitive film come
Magnetic susceptibility unit is made, its small volume, being easily integrated, multiple magnetic susceptibility units can be made in limited area, that is, are obtained
Obtain magnetic susceptibility unit dot matrix.According to iconology principle, magnetic field sources in thing to be checked can be obtained by two magnetic susceptibility unit dot matrix
Two dimensional surface distribution collection of illustrative plates, i.e. the magnetic stripe to two dimensional surface or magnetic dot carry out magnetic imaging, so as to more thoroughly, comprehensively to false proof
Mark is identified, and then can more accurately identify the true and false of thing to be checked.Moreover, the favour stone electricity being made up of inductive magnetic thin film
The size for the differential signal that bridge circuit obtains is proportional to extraneous magnetic signal power, and therefore, magnetic sensor chip can not only obtain
The position of magnetic field sources is obtained, and the power of extraneous magnetic signal can be obtained.In addition, this magnetic image sensor has structure simple
It is single, cost is low, small volume, thickness of thin and the advantages that high sensitivity so that magnetic image sensor can adapt to be miniaturized, integrate
Many demands for development such as change, low-power consumption and high-performance.
False distinguishing method provided by the invention, differentiate thing to be checked as a result of magnetic image sensor provided by the invention
The true and false, thus can in thing two dimensional surface to be checked magnetic field sources carry out magnetic imaging, so as to more thoroughly, comprehensively to anti-false sign
It is identified, so as to more accurately identify the true and false of thing to be checked.
Brief description of the drawings
Fig. 1 is the sectional view for the Magnetic Sensor that existing financial fake identifying machine uses；
Fig. 2 a are the stereogram of finance false distinguishing plane magnetic sensor of the embodiment of the present invention；
Fig. 2 b are the exploded view of finance false distinguishing plane magnetic sensor of the embodiment of the present invention；
Fig. 3 a are the structural representation of the first magnetic susceptibility unit dot matrix of the embodiment of the present invention, wherein, every row magnetic susceptibility unit
In each magnetic susceptibility unit symmetrical centre on the same line, the spacing of magnetic susceptibility unit is equal, moreover, often row magnetosensitive
Unit is felt by the endless all standing of the transverse direction of magnetic sensor chip；
Fig. 3 b are the structural representation of the first magnetic susceptibility unit dot matrix of the embodiment of the present invention, wherein, every row magnetic susceptibility unit
In each magnetic susceptibility unit symmetrical centre on the same line, the spacing of magnetic susceptibility unit is not completely equivalent, moreover, often going
Magnetic susceptibility unit covers the transverse direction of magnetic sensor chip；
Fig. 3 c are the structural representation of another embodiment of the present invention magnetic susceptibility unit dot matrix, wherein, every row magnetic susceptibility unit
In each magnetic susceptibility unit symmetrical centre not on the same line, the spacing of magnetic susceptibility unit is equal, moreover, often row magnetic susceptibility
The transverse direction of magnetic sensor chip is completely covered for unit；
Fig. 3 d are the structural representation of further embodiment of this invention magnetic susceptibility unit dot matrix, wherein, every row magnetic susceptibility unit
In each magnetic susceptibility unit symmetrical centre not exclusively on the same line, the spacing of magnetic susceptibility unit is not completely equivalent, moreover,
Often the transverse direction of magnetic sensor chip is completely covered for row magnetic susceptibility unit；
Fig. 3 e are the structural representation of further embodiment of this invention magnetic susceptibility unit dot matrix, wherein, every row magnetic susceptibility unit
In each magnetic susceptibility unit symmetrical centre on the same line, the spacing of magnetic susceptibility unit is successively decreased successively, moreover, often row magnetosensitive
The transverse direction of magnetic sensor chip is completely covered for sense unit；
Fig. 3 f are the structural representation of magnetic susceptibility unit dot matrix in favour stone full-bridge circuit of the embodiment of the present invention, wherein, often
On the same line, the spacing of magnetic susceptibility unit is equal for the symmetrical centre of each magnetic susceptibility unit in row magnetic susceptibility unit, and
And often row magnetic susceptibility unit passes magnetic
The endless all standing of transverse direction of sensor chip；
Fig. 4 a are the schematic diagram of favour stone half-bridge circuit of the embodiment of the present invention；
Fig. 4 b are the schematic diagram of favour stone full-bridge circuit of the embodiment of the present invention；
Embodiment
Fig. 5 is the structural representation of another embodiment of the present invention magnetic susceptibility unit；
Fig. 6 is the structural representation of the second magnetic susceptibility unit dot matrix of the embodiment of the present invention.
To make those skilled in the art more fully understand technical scheme, the present invention is carried below in conjunction with the accompanying drawings
The magnetic image sensor and false distinguishing method of confession are described in detail.
Magnetic image sensor provided by the invention includes magnetic sensor chip, and magnetic sensor chip includes the first magnetic susceptibility list
First dot matrix and the second magnetic susceptibility unit dot matrix, the angle theta between the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix
For 0 180 ° of ＜ θ ＜, the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix include N number of and M magnetic susceptibility list respectively
Member, the magnetic susceptibility unit are the wheatstone bridge circuits made by magnetic sensitive film, wherein, N, M are >=1 integer.
The magnetic image sensor can be used for the cash inspecting machine of financial field, such as differentiate the true and false, the true and false of bill of banknote；
It can be used for other fields such as trade mark, commodity, such as differentiate the true and false of trade mark.It should be noted that the sensing that the present embodiment provides
Plane distribution collection of illustrative plates of the device due to that can obtain magnetic field field source in thing to be checked, therefore, is referred to as magnetic image sensor by sensor.
Magnetic image sensor provided by the invention is situated between by taking the magnetic image sensor that financial field uses as an example below
Continue.
Fig. 2 a are the stereogram of magnetic image sensor of the embodiment of the present invention, and Fig. 2 b are magnetic image sensor of the embodiment of the present invention
Exploded view.Also referring to Fig. 2 a and Fig. 2 b, magnetic image sensor provided by the invention includes shield shell 1, Magnetic Sensor
Chip 2, printed circuit board (PCB) 4, insulation gap 5 and capillary 41, magnetic sensor chip 2 be fixed on printed circuit board (PCB) 4 and with print
Printed circuit board 4 electrically connects.Magnetic sensor chip 2 and printed circuit board (PCB) 4 are arranged in shield shell 1.It is provided with shield shell 1
Magnetic conductive hole 3, magnetic sensor chip 2 is relative with the position of magnetic conductive hole 3, and magnetic sensor chip 2 receives the magnetic in the external world by magnetic conductive hole 3
Signal.In addition, the top of magnetic sensor chip 2 is less than the upper surface of shield shell 1, such shield shell 1 can will be parallel to
The extraneous magnetic signal shielding of the sensitive surface of magnetic sensor chip 2, makes magnetic sensor chip 2 only receive and the sense of magnetic sensor chip 2
The extraneous magnetic signal that face is perpendicular is answered, to improve the sensitivity of magnetic image sensor and antijamming capability.
Capillary 41 is fixed on printed circuit board (PCB) 4 and electrically connected with the differential signal outputs of magnetic sensor chip 2, i.e. capillary
The 41 signal output terminals as magnetic image sensor, and capillary 41 can also be used to support and fix magnetic image sensor,
Magnetic image sensor is fixed on other parts such as circuit board.Earth terminal 11 is additionally provided with shield shell 1, is connect
Ground terminal 11 is used to shield shell 1 being grounded.
Insulation gap 5 is arranged between printed circuit board (PCB) 4 and shield shell 1, and magnetic sensor chip 2 is positioned at insulating
In the through hole at interval 5, by insulation gap 5 magnetic sensor chip 2 can be avoided to be damaged because of collision.
The present embodiment magnetic sensor chip includes the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, the first magnetic
Angle theta between sensing unit dot matrix and the second magnetic susceptibility unit dot matrix is 90 °, i.e. the first magnetic susceptibility unit dot matrix and the second magnetic
Sensing unit dot matrix is mutually perpendicular to.In other embodiments, the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix it
Between angle theta can be 15 °, 30 °, 45 °, 60 °, 85 °, 100 °, 135 °, 150 °, 165 ° or 185 °, by the first magnetic susceptibility list
First dot matrix and the second magnetic susceptibility unit dot matrix can detect the positions and dimensions of magnetic field sources in two dimensional surface, i.e., can not only obtain
The position of magnetic stripe or magnetic dot is obtained, the length of magnetic stripe can also be obtained.
Fig. 3 a are the structural representation of the first magnetic susceptibility unit dot matrix of the embodiment of the present invention.As shown in Figure 3 a, the first magnetosensitive
Sense unit dot matrix includes 9 magnetic susceptibility units, and is set with 3 × 3 array ways, specifically, the first magnetic susceptibility unit dot matrix
It is often capable to include 3 row magnetic susceptibility units provided with 3 row magnetic susceptibility units.Magnetic susceptibility unit transverse is set, in other words, magnetic susceptibility list
Member is horizontally disposed.
It should be noted that in actual applications, the first magnetic susceptibility unit dot matrix can be arranged as required to any number of
Magnetic susceptibility unit, i.e. the first magnetic susceptibility unit dot matrix can include N number of magnetic susceptibility unit, wherein, N is >=1 integer.Can be with
Understanding, the first magnetic susceptibility unit dot matrix can be arranged to n rows × m row according to the quantity of magnetic susceptibility unit, wherein, m, n are >=1
Integer, such as 2 × 5 magnetic susceptibility units, 4 × 3 magnetic susceptibility units or 1 × 2 magnetic susceptibility unit.
Magnetic sensitive film i.e. the first magnetic sensitive film that magnetic susceptibility unit is parallel to each other including a pair and pinning is in opposite direction
31a and the second magnetic sensitive film 31b, is separated by a certain distance between the first magnetic sensitive film 31a and the second magnetic sensitive film 31b,
The distance can be set according to the sensitivity of magnetic image sensor.Normal conditions, the first magnetic sensitive film 31a and the second magnetosensitive
It can be 5~30 μm, preferably 5~20 μm to feel the distance between film 31b.Certainly, the spacing of magnetic susceptibility unit also can be according to reality
Border requires that setting is greater or lesser.
In the present embodiment, the spacing between the first magnetic sensitive film 31a and the second magnetic sensitive film 31b is referred to as magnetic
The spacing of sensing unit, by the symmetrical centre of the first magnetic sensitive film 31a and the second magnetic sensitive film 31b in its longitudinal direction
The referred to as symmetrical centre of magnetic susceptibility unit.
The present embodiment laterally sets the first magnetic susceptibility unit dot matrix, i.e. by each magnetic in the first magnetic susceptibility unit dot matrix
The symmetrical centre of sensing unit is horizontally disposed with.Moreover, the spacing of 3 × 3 magnetic susceptibility units in the first magnetic susceptibility unit dot matrix
It is all equal.
In actual applications, the spacing of the magnetic susceptibility unit in the first magnetic susceptibility unit dot matrix can also be not completely equivalent.
As shown in Figure 3 b, the spacing of secondary series magnetic susceptibility unit and first row magnetic susceptibility unit, the 3rd row magnetic susceptibility unit spacing not
Deng.It can be appreciated that the spacing of the different magnetic susceptibility units in same row magnetic susceptibility unit can be with equal, can also be unequal.
In the present embodiment, the spacing of magnetic susceptibility unit is smaller, and the sensitivity of magnetic sensor chip is higher.Therefore, passed in magnetic
In sensor chip, the spacing of magnetic susceptibility unit can be determined according to the power of magnetic marker in thing to be checked.
In the present embodiment, in the first magnetic susceptibility unit dot matrix, often the symmetrical centre of row magnetic susceptibility unit is the same as always
On line, as shown in Figure 3 a, magnetic susceptibility unit N11, N12, N13 symmetrical centre on the same line, magnetic susceptibility unit N21,
On the same line, magnetic susceptibility unit N31, N32, N33 symmetrical centre are on the same line for N22, N23 symmetrical centre.
In another embodiment, in the first magnetic susceptibility unit dot matrix, often the symmetrical centre of row magnetic susceptibility unit is incomplete
On the same line.As shown in Figure 3 c, magnetic susceptibility unit N11, N12, N13 symmetrical centre not on the same line, magnetosensitive
Feel unit N21, N22, N23 symmetrical centre not on the same line, magnetic susceptibility unit N31, N32, N33 symmetrical centre are equal
Not on the same line.
In another embodiment, as shown in Figure 3 d, in the first row magnetic susceptibility unit, magnetic susceptibility unit N13 it is symmetrical in
The heart and magnetic susceptibility unit N11, N12 symmetrical centre not on the same line, magnetic susceptibility unit N23 symmetrical centre and magnetic susceptibility
Unit N21, N22 symmetrical centre not on the same line, magnetic susceptibility unit N33 symmetrical centre and magnetic susceptibility unit N31,
N32 symmetrical centre is not on the same line.
In the present embodiment, on the horizontal direction of magnetic sensor chip, all deposited between magnetic susceptibility unit N11, N12, N13
In gap, that is to say, that magnetic susceptibility unit N11, N12, N13 the horizontal direction of magnetic sensor chip are not completely covered.
In another embodiment, as shown in Fig. 3 b, 3c, 3d, on the horizontal direction of magnetic sensor chip, magnetic susceptibility unit
Gap, i.e. magnetic susceptibility list is not present between N11 and magnetic susceptibility unit N12, between magnetic susceptibility unit N12 and magnetic susceptibility unit N13
The tail end of first N11 magnetic susceptibility film is mutually connected with the head end of magnetic susceptibility unit N12 magnetic susceptibility film, magnetic susceptibility unit N12 magnetic
The tail end of sensitive membrane is mutually connected with the head end of magnetic susceptibility unit N13 magnetic susceptibility film, magnetic susceptibility unit N11 and magnetic susceptibility unit
The transverse direction of magnetic sensor chip is completely covered for N12 and magnetic susceptibility unit N13 and its point array element.Sensed using the magnetic image
When device distinguishes banknote, the horizontal magnetic sensor chip of magnetic sensor chip is completely covered, and paper money can be completely covered in one direction
Ticket, so as to avoid missing inspection or the defects of dead zone be present.
As shown in Figure 3 e, in three magnetic susceptibility units of the first row magnetic susceptibility unit, magnetic susceptibility unit N12 spacing is small
In magnetic susceptibility unit N11 spacing, the magnetic susceptibility unit N13 spacing for being smaller than magnetic susceptibility unit N12, i.e. magnetic susceptibility list
First N11, N12, N13 spacing are successively decreased successively.Certainly, in three magnetic susceptibility units of the first row magnetic susceptibility unit, magnetic susceptibility
Unit N11, N12, N13 spacing are incremented by successively.Or as shown in Figure 3 b, magnetic susceptibility unit N11, N12, N13 spacing first subtract
Increase after small.Or as shown in Figure 3 d, magnetic susceptibility unit N11 spacing is more than magnetic susceptibility unit N12, N13 spacing, magnetosensitive
The spacing for feeling unit N12 and magnetic susceptibility unit N13 is equal.
The set-up mode of second row magnetic susceptibility unit and the third line magnetic susceptibility unit and the complete phase of the first row magnetic susceptibility unit
Together, will not be repeated here.
In the present embodiment, magnetic susceptibility unit is by the first magnetic sensitive film 31a and the second magnetic sensitive film 31b electrical connections
The favour stone half-bridge circuit formed.In actual applications, magnetic susceptibility unit is additionally provided with for electrically connecting the first magnetic sensitive film 31a
With the second magnetic sensitive film 31b first electrode 32a, second electrode 32b and public electrode 33a, wherein, public electrode 33a
First magnetic sensitive film 31a and the second magnetic sensitive film 31b one end are electrically connected, 32b points of first electrode 32a and second electrode
The other end not with the first magnetic sensitive film 31a and the second magnetic sensitive film 31b electrically connects, so as to obtain favour stone half-bridge electricity
Road, and first electrode 32a and public electrode 33a or second electrode 31b and public electrode 33a is as favour stone half-bridge circuit
Difference output end, or perhaps port difference.The structural portion of other each magnetic susceptibility units is identical, will not be repeated here.
Fig. 4 a are the topological diagram of favour stone half-bridge circuit of the embodiment of the present invention.As shown in fig. 4 a, arrow represents the first magnetosensitive
The pinning for feeling film 31a and the second magnetic sensitive film 31b is in opposite direction.First electricity in three terminal As, B, C difference corresponding diagram 3a
Pole 32a, second electrode 32b and public electrode 33a.Wherein, terminal B and end points C or terminal A and end points C are as favour stone
The difference output end of half-bridge circuit.Identified by the differential signal that favour stone half-bridge circuit obtains with being used for false proof magnetic on thing to be checked
It is strong and weak proportional, whether it can not only differentiate magnetic mark, and can differentiate the power of magnetic mark, so as to more accurately
Obtain magnetic identification information.
In another embodiment of the invention, magnetic susceptibility unit is favour stone full-bridge circuit, i.e., is obtained using magnetic sensitive film
Obtain favour stone full-bridge circuit.As illustrated in figure 3f, it is thin to include the first magnetic sensitive film 31a, the second magnetic susceptibility for favour stone full-bridge circuit
Film 31b, the 3rd magnetic sensitive film 31c skills the 4th magnetic sensitive film 31d, first electrode 32a, second electrode 32b, the first common electrical
Pole 33a and the second public electrode 33b.Wherein, the first magnetic sensitive film 31a and the second magnetic sensitive film 31b be parallel to each other and
Pinning direction is identical, the 3rd magnetic sensitive film 31c and the 4th magnetic sensitive film 31d is parallel to each other and pinning direction is identical, moreover,
First magnetic sensitive film 31a and the second magnetic sensitive film 31b pinning direction and the 3rd magnetic sensitive film 31c and the 4th magnetosensitive
The pinning for feeling film 31d is in opposite direction.First public electrode 33a is by the first magnetic sensitive film 31a and the 3rd magnetic sensitive film 31c
One end electrical connection, the second public electrode 33b is by the second magnetic sensitive film 31b and the 3rd magnetic sensitive film 31c other end electricity
Connection, first electrode 32a and second electrode 32b respectively with the first magnetic sensitive film 31a and the 3rd magnetic sensitive film 31c, second
Magnetic sensitive film 31b and the 4th magnetic sensitive film 31d electrical connections.
In one more embodiment of the present invention, favour stone full-bridge circuit is made up of four magnetic sensitive films, every magnetic susceptibility
An arm bridge of the film as wheatstone bridge circuits.
Fig. 4 b are the topological diagram of favour stone full-bridge circuit of the embodiment of the present invention.As shown in Figure 4 b, arrow represents the first magnetosensitive
The pinning direction for feeling film 31a and the second magnetic sensitive film 31b is identical.3rd magnetic sensitive film 31c and the 4th magnetic sensitive film
31d pinning direction is identical, first electrode 32a, second electrode 32b, the first public affairs in four terminal As, B, C, D difference corresponding diagram 3f
Common electrode 33a and the second public electrode 33b.Wherein, the difference output end of terminal B and end points C as favour stone full-bridge circuit.
By the differential signal that favour stone full-bridge circuit obtains to being used for the strong and weak proportional of false proof magnetic mark on thing to be checked, it not only may be used
To differentiate whether there is magnetic mark, and the power of magnetic mark can be differentiated, so as to more accurately obtain magnetic identification information.
In addition, in the above-described embodiments, the magnetic sensitive film for forming magnetic susceptibility unit is linear pattern film.However, this
Invention is not limited thereto.Magnetic sensitive film can also be the snakelike of bending, as shown in figure 5, magnetic sensitive film 31a, 31b are folding
Linear, public electrode 33a electrically connects magnetic sensitive film 31a and magnetic sensitive film 31b one end, first electrode 32a and second
The other ends of the electrode 32b respectively with magnetic sensitive film 31a and magnetic sensitive film 31b electrically connects.Certainly, magnetic sensitive film can also
Using other broken line shapes, such as smooth shaped form, will not enumerate herein.
The present embodiment is provided with M magnetic susceptibility unit in the second magnetic susceptibility unit dot matrix, and M is >=1 integer, moreover,
Magnetic susceptibility unit is longitudinally disposed.
Certainly, in the second magnetic susceptibility unit dot matrix M concrete numerical value according to the anti-counterfeiting mark set in actual thing to be checked and
Fixed, M can be equal with N, can not also wait.
M magnetic susceptibility unit is set according to a rows × b column arrays, a, b are >=1 integer.Second magnetic susceptibility unit dot matrix
In M magnetic susceptibility unit structure it is identical with the structure of magnetic susceptibility unit in the first magnetic susceptibility unit dot matrix, e.g., second
The spacing of a × b magnetic susceptibility unit in magnetic susceptibility unit dot matrix is equal or is not completely equivalent.And for example, each column magnetic susceptibility list
The symmetrical centre of each magnetic susceptibility unit in member on the same line, or not exclusively on the same line.For another example, a rows magnetosensitive
Gap will be not present in sense unit on the longitudinal direction of magnetic sensor chip, the longitudinal direction of magnetic sensor chip is completely covered, or
Gap be present on the longitudinal direction of magnetic sensor chip in person, a row magnetic susceptibility units.Referred in the first magnetic susceptibility unit dot matrix
The feature of magnetic susceptibility unit may be used to the second magnetic susceptibility unit dot matrix.
The second magnetic susceptibility unit dot matrix as an example is only arranged below to be introduced.As shown in fig. 6, it is the embodiment of the present invention second
The structural representation of magnetic susceptibility unit dot matrix.Second magnetic susceptibility unit dot matrix includes 3 × 3 magnetic susceptibility units, magnetic susceptibility unit
Longitudinally disposed, magnetic susceptibility unit M11, M31, magnetic susceptibility unit M12, M32 is equal with magnetic susceptibility unit M13, M33 spacing, magnetic
Sensing unit M21, magnetic susceptibility unit M22, with magnetic susceptibility unit M23 than other magnetic susceptibility units M11, M13, M21, M23, M31,
M33 spacing is small.First row magnetic susceptibility unit M11, M12, M13 symmetrical centre on the same line, secondary series magnetic susceptibility list
On the same line, the 3rd row magnetic susceptibility unit M31, M32, M33 symmetrical centre is same for first M21, M22, M23 symmetrical centre
On one straight line.
As another embodiment of the present invention, on the longitudinal direction of magnetic sensor chip, magnetic susceptibility unit M11, M21,
The longitudinal direction of magnetic sensor chip is completely covered M31, magnetic susceptibility unit M, and 21, M22, M32 be by the vertical of magnetic sensor chip
It is completely covered to direction, the longitudinal direction of magnetic sensor chip is completely covered magnetic susceptibility unit M31, M32, M33, i.e. each column magnetic
Gap is not present in sensing unit on the longitudinal direction of magnetic sensor chip, such as in first row magnetic susceptibility unit, magnetic susceptibility list
The tail end of first M11 magnetic susceptibility film is mutually connected with the head end of magnetic susceptibility unit M21 magnetic susceptibility film, magnetic susceptibility unit M21 magnetic
The tail end of sensitive membrane is mutually connected with the head end of magnetic susceptibility unit M31 magnetic susceptibility film, the linking feelings of other each row magnetic susceptibility units
Condition is also identical, and the longitudinal direction of magnetic sensor chip is completely covered whole magnetic susceptibility unit dot matrix.
It should be noted that in magnetic sensor chip, can be by the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility list
Magnetic susceptibility unit in first dot matrix is set as follows, i.e. n × m magnetic susceptibility list in the first magnetic susceptibility unit dot matrix
The spacing of member is equal；The spacing of a × b magnetic susceptibility unit in second magnetic susceptibility unit dot matrix is unequal.Or first magnetosensitive
The spacing for feeling n × m magnetic susceptibility unit in unit dot matrix is unequal；A × b magnetic susceptibility in second magnetic susceptibility unit dot matrix
The spacing of unit is equal.It is appreciated that the further feature of magnetic susceptibility unit can also be distinguished as the spacing of magnetic susceptibility unit
The cross-reference in the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix.
In the present embodiment, the second magnetic susceptibility unit dot matrix equally can be favour stone full-bridge circuit or favour stone half-bridge electricity
Road.
In the present embodiment, magnetic sensitive film can be continuous continual film, can also include multistage film section, and
And adjacent film section is electrically connected by conductor.Magnetic sensitive film is Hall effect film, anisotropic magnetoresistance film, huge magnetoelectricity
Hinder film, tunnel magneto resistance film, giant magnetoresistance films or giant Hall effect film.
Magnetic image sensor provided by the invention also includes data processing unit (not shown), and data processing unit is used
In the differential signal of the wheatstone bridge circuits received, and according to differential signal distinguish the position of magnetic marker, magnetic marker it is strong
Weak and magnetic marker size.
In the present embodiment, shielding shell can use Ferrite Material or permalloy material to make, or using gold
Belong to material to make, and the coating made in the coating of its surface by Ferrite Material or permalloy material.
It is pointed out that in the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, magnetic susceptibility unit
Quantity and set location can also be set according to the position for the magnetic marker being arranged in thing to be checked, for example, being set in thing to be checked
Have three magnetic markers, then only in the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix with these three magnetic marker phases
To position magnetic induction unit is set, can equally improve the accuracy of false distinguishing.
The present embodiment provide magnetic image sensor, magnetic sensor chip therein include the first magnetic susceptibility unit dot matrix and
Second magnetic susceptibility unit dot matrix, the angle theta between the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix
For 0 180 ° of ＜ θ ＜, the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix include N number of and M magnetic respectively
Sensing unit, the magnetic susceptibility unit are the wheatstone bridge circuits made by magnetic sensitive film.Due to using magnetic sensitive film
To make magnetic susceptibility unit, its small volume, being easily integrated, multiple magnetic susceptibility units can be made in limited area, i.e.,
Obtain magnetic susceptibility unit dot matrix.According to iconology principle, magnetic field in thing to be checked can be obtained by two magnetic susceptibility unit dot matrix
The plane distribution collection of illustrative plates of field source, that is, obtain position, power and the size of magnetic anti-false sign, so as to more thoroughly, comprehensively to anti-
Pseudo- mark is identified, and then more accurately identifies the true and false of thing to be checked.Moreover, the Wheatstone bridge being made up of inductive magnetic thin film
The size for the differential signal that circuit obtains is proportional to extraneous magnetic signal power, and therefore, magnetic sensor chip can not only obtain
The position of magnetic field sources, and the power of extraneous magnetic signal can be obtained.In addition, this magnetic image sensor have it is simple in construction,
Cost is low, small volume, thickness of thin and the advantages that high sensitivity so that magnetic image sensor can adapt to miniaturization, it is integrated,
Many demands for development such as low-power consumption and high-performance.
The present embodiment also provides a kind of false distinguishing method, comprises the following steps：
Step S1, obtain magnetic image sensor.
Magnetic image sensor uses the magnetic image sensor that the present embodiment provides, the specific features of magnetic image sensor referring to
Above, it is not described in detail herein.
Step S2, differential signal is obtained by magnetic image sensor.
The magnetic field of sensing magnetic marker can make the wheatstone bridge circuits in magnetic image sensor produce differential signal, difference
The size of signal is strong and weak corresponding with magnetic marker.
Step S3, magnetic marker is distinguished according to differential signal, so as to the Distribution of Magnetic Field figure on thing surface to be checked.
The position of magnetic marker can be not only distinguished according to differential signal, and the power and size of magnetic marker can be distinguished.
Moreover, can be to being arranged on diverse location in thing to be checked by the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix
Magnetic marker carries out two-dimensional imaging, so as to improve the accuracy of false distinguishing.
The false distinguishing method that the present embodiment provides, differentiates thing to be checked as a result of magnetic image sensor provided by the invention
The true and false, therefore the distribution collection of illustrative plates of magnetic field field source in thing to be checked can be obtained, so as to more thoroughly, comprehensively be carried out to anti-false sign
Identification, so as to more accurately identify the true and false of thing to be checked.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, but the invention is not limited in this.For those skilled in the art, the essence of the present invention is not being departed from
In the case of refreshing and essence, various changes and modifications can be made therein, and these variations and modifications are also considered as protection scope of the present invention.
Claims (18)
1. a kind of magnetic image sensor, including magnetic sensor chip, it is characterised in that the magnetic sensor chip includes the first magnetic
Sensing unit dot matrix and the second magnetic susceptibility unit dot matrix, the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit spot
Angle theta between battle array is 0 180 ° of ＜ θ ＜, the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix difference
Including N number of and M magnetic susceptibility unit, the impedance of each magnetic susceptibility unit changes under the influence of a magnetic field, the magnetosensitive
Sense unit is the wheatstone bridge circuits made by magnetic sensitive film, wherein, N, M are >=2 integer；The first magnetic susceptibility list
First dot matrix includes the n × m magnetic susceptibility units, moreover, the magnetic susceptibility unit transverse is set, m, n are >=1 integer；
The second magnetic susceptibility unit dot matrix includes a × b magnetic susceptibility units, moreover, the magnetic susceptibility unit is longitudinally set
Put, a, b are >=1 integer；
The magnetic susceptibility unit includes the magnetic sensitive film that at least one pair of is parallel to each other and pinning is in opposite direction, and the magnetosensitive
The spacing for feeling unit is the distance between two described magnetic sensitive films, and the symmetrical centre of the magnetic susceptibility unit is described in two
The symmetrical centre of magnetic sensitive film in its longitudinal direction.
2. magnetic image sensor according to claim 1, it is characterised in that the n in the first magnetic susceptibility unit dot matrix
The spacing of × m magnetic susceptibility the units is equal；A × b magnetic susceptibility the units in the second magnetic susceptibility unit dot matrix
Spacing it is equal.
3. magnetic image sensor according to claim 1, it is characterised in that the n in the first magnetic susceptibility unit dot matrix
The spacing of × m magnetic susceptibility the units is not completely equivalent；A × b the magnetic in the second magnetic susceptibility unit dot matrix
The spacing of sensing unit is not completely equivalent.
4. magnetic image sensor according to claim 1, it is characterised in that the n in the first magnetic susceptibility unit dot matrix
The spacing of × m magnetic susceptibility the units is equal；A × b magnetic susceptibility the units in the second magnetic susceptibility unit dot matrix
Spacing it is unequal；Or
The spacing of the n × m magnetic susceptibility units in the first magnetic susceptibility unit dot matrix is unequal；Second magnetic susceptibility
The spacing of a × b magnetic susceptibility units in unit dot matrix is equal.
5. magnetic image sensor according to claim 1, it is characterised in that in the first magnetic susceptibility unit dot matrix,
Often the symmetrical centre of each magnetic susceptibility unit in row magnetic susceptibility unit is on the same line.
6. magnetic image sensor according to claim 1, it is characterised in that in the first magnetic susceptibility unit dot matrix,
Often the symmetrical centre of each magnetic susceptibility unit in row magnetic susceptibility unit is incomplete on the same line.
7. magnetic image sensor according to claim 1, it is characterised in that in the second magnetic susceptibility unit dot matrix,
The symmetrical centre of each magnetic susceptibility unit in each column magnetic susceptibility unit is on the same line.
8. magnetic image sensor according to claim 1, it is characterised in that in the second magnetic susceptibility unit dot matrix,
The symmetrical centre of each magnetic susceptibility unit in each column magnetic susceptibility unit is not exclusively on the same line.
9. magnetic image sensor according to claim 1, it is characterised in that in the first magnetic susceptibility unit dot matrix, m
Arrange the magnetic susceptibility unit and gap is not present on the horizontal direction of the magnetic sensor chip, by the magnetic sensor chip
Transverse direction be completely covered；
In the second magnetic susceptibility unit dot matrix, magnetic susceptibility unit described in a rows is by the longitudinal direction of the magnetic sensor chip
It is upper that gap is not present, the longitudinal direction of the magnetic sensor chip is completely covered.
10. magnetic image sensor according to claim 1, it is characterised in that in the first magnetic susceptibility unit dot matrix,
M arranges the magnetic susceptibility unit and gap be present on the horizontal direction of the magnetic sensor chip；
In the second magnetic susceptibility unit dot matrix, longitudinal direction of the magnetic susceptibility unit in the magnetic sensor chip described in a rows
On gap be present.
11. magnetic image sensor according to claim 1, it is characterised in that the wheatstone bridge circuits are favour stone
Half-bridge circuit, or, the wheatstone bridge circuits are favour stone full-bridge circuit, and each wheatstone bridge circuits are provided with one
Individual port difference.
12. magnetic image sensor according to claim 1, it is characterised in that the magnetic sensitive film is continuous uninterrupted
Film.
13. magnetic image sensor according to claim 1, it is characterised in that the magnetic sensitive film includes multistage film
Section, the film section is by conductor series connection.
14. magnetic image sensor according to claim 1, it is characterised in that the magnetic sensitive film is linear pattern film
Or the snakelike film of bending.
15. magnetic image sensor according to claim 1, it is characterised in that the magnetic sensitive film is that Hall effect is thin
Film, anisotropic magnetoresistance film, giant magnet resistance film, tunnel magneto resistance film, giant magnetoresistance films or giant Hall effect are thin
Film.
16. according to the magnetic image sensor described in claim 1-15 any one, it is characterised in that also including printed circuit
Plate, capillary, shielding shell and data processing unit,
The magnetic sensor chip electrically connects with the printed circuit board；
Magnetic conduction window is provided with the shielding shell, the magnetic sensor chip and the printed circuit board are arranged on the screen
Cover in shell, and the magnetic susceptibility unit is relative with the magnetic conduction window；
The printed circuit board is fixed in one end of the capillary, and with wheatstone bridge circuits in the magnetic sensor chip
Difference output end electrically connects
The data processing unit receives the differential signal of the wheatstone bridge circuits by the capillary, and according to the difference
Sub-signal obtains magnetic marker.
17. magnetic image sensor according to claim 16, it is characterised in that the shielding shell uses Ferrite Material
Or permalloy material makes, or made using metal material or nonmetallic materials, and coated on its surface by ferrite material
The coating that material or permalloy material make.
A kind of 18. false distinguishing method, it is characterised in that comprise the following steps：
Magnetic image sensor is obtained, the magnetic image sensor is the magnetic image sensing described in claim 1-17 any one
Device；
Differential signal is obtained by the magnetic image sensor；
Magnetic marker is distinguished according to the differential signal, so as to obtain the Distribution of Magnetic Field figure on thing surface to be checked.
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| 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 |
| 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 |
| 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 |
| CN104794416B (en) * | 2015-03-23 | 2016-11-16 | 广州知途鸟智能科技有限公司 | The identification structure that automatic electric connects between more than two electronic devices |
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| CN2788259Y (en) * | 2005-04-15 | 2006-06-14 | 福建省电影机械厂 | Huge magnetic resistance sensor of paper money counter |
| CN102298124A (en) * | 2011-03-03 | 2011-12-28 | 江苏多维科技有限公司 | Independently packaged bridge type magnetic field angle sensor |
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| US6822443B1 (en) * | 2000-09-11 | 2004-11-23 | Albany Instruments, Inc. | Sensors and probes for mapping electromagnetic fields |
| JP3725361B2 (en) * | 1999-03-18 | 2005-12-07 | 株式会社日本コンラックス | Method and apparatus for inspecting authenticity of banknotes |
| CN1321952A (en) * | 2000-05-01 | 2001-11-14 | 林子春 | Special-purpose magnetic-sensing sensor for currency count machine |
| DE10118650A1 (en) * | 2001-04-14 | 2002-10-17 | Philips Corp Intellectual Pty | Angle sensor and method for increasing the anisotropy field strength of a sensor unit of an angle sensor |
| CN101231265A (en) * | 2008-01-31 | 2008-07-30 | 华南理工大学 | Electromagnetic nondestructive testing probe |
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| CN2788259Y (en) * | 2005-04-15 | 2006-06-14 | 福建省电影机械厂 | Huge magnetic resistance sensor of paper money counter |
| CN102298124A (en) * | 2011-03-03 | 2011-12-28 | 江苏多维科技有限公司 | Independently packaged bridge type magnetic field angle sensor |
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