CN103632431A - A magnetic image sensor and an authentic identification method - Google Patents
A magnetic image sensor and an authentic identification method Download PDFInfo
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- CN103632431A CN103632431A CN201210297794.3A CN201210297794A CN103632431A CN 103632431 A CN103632431 A CN 103632431A CN 201210297794 A CN201210297794 A CN 201210297794A CN 103632431 A CN103632431 A CN 103632431A
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Abstract
The invention provides a magnetic image sensor and an authentic identification method. The magnetic image sensor comprises a magnetic sensor chip. The characteristics are that: the magnetic sensor chip comprises a first magnetic sensitive dot matrix and a second magnetic sensitive unit dot matrix; an included angle theta between the first magnetic sensitive dot matrix and the second magnetic sensitive unit dot matrix is in the range of 0<theta<180 degrees; the first magnetic sensitive dot matrix and the second magnetic sensitive unit dot matrix respectively comprise N magnetic sensitive units and M magnetic sensitive units; and the magnetic sensitive units are Wheatstone bridge circuits made of magnetic sensitive films, wherein the N and the M are integers greater or equal to 1. The magnetic image sensor can carry out magnetic imaging on magnetic stripes or magnetic dots in a two dimensional plane, so that demands for two dimension authentic identification can be realized.
Description
Technical field
The invention belongs to Magnetic Sensor technical field, be specifically related to a kind of false distinguishing mechanism magnetic image sensor and preparation method thereof.
Background technology
Sensing unit in Magnetic Sensor has sensitization to the magnetic variation being caused by variations such as magnetic field, electric current, ess-strain, temperature, light, that is, magnetic variation meeting causes the magnetic property of sensing unit to change.The magnetic property of sensing unit is changed and converts electric signal to, by measuring electric signal, can obtain the value of the physical quantitys such as magnetic field, electric current, ess-strain, temperature or light accordingly.The magnetic property that all can cause sensing unit due to small magnetic variationization changes.Therefore, Magnetic Sensor is widely used in Aeronautics and Astronautics, microelectronics, the high-accuracy fields such as geological exploration, medical imaging, information acquisition and military affairs.
At present, the Magnetic Sensor being widely used is coil type Magnetic Sensor, that is, sensing unit is coil.Fig. 1 is the sectional view of the Magnetic Sensor of existing financial fake identifying machine (as the false distinguishing unit in cash inspecting machine or other financial machine and tool) employing.As shown in Figure 1, Magnetic Sensor comprises housing 101, magnetic core 105, coil 109 and printed circuit board 113.On the top of shell 101, be provided with opening 103.Magnetic core 105 comprises the first magnetic core 105a and the second magnetic core 105b, and the first magnetic core 105a and the second magnetic core 105b are fixed in housing 101 by support 111.Top at the first magnetic core 105a and the second magnetic core 105b is provided with protuberance, and protuberance is outside opening 103 stretches out housing 101.Center on the top of protuberance is provided with magnetic gap 107.Below magnetic gap 107, be provided with coil 109, coil 109 is electrically connected to printed circuit board 113, and printed circuit board 113 is connected with other system (not shown) in financial fake identifying machine by capillary 114.
During use, the protuberance of magnetic core 105 is streaked from banknote magnetic oil ink-stick or magnetic metal bar surface.Due to the existence of magnetic gap 107, coil 109 magnetic field is around changed, thereby form induced electromotive force in coil 109.The magnetic field intensity of the size of this induced electromotive force and banknote magnetic oil ink-stick or magnetic metal bar is proportional, can distinguish accordingly the true and false of banknote.
Yet, along with the development of note-printing technique and the appearance of avoiding counterfeit money, Yin Chao factory in the two dimensional surface of banknote, be provided with a plurality of for the different magnetic stripe of false proof power or magnetic dot as recessive anti-fake mark, the length of position, magnetic power and magnetic stripe by judgement magnetic stripe and magnetic dot is differentiated the true and false of banknote.Existing financial fake identifying machine can only obtain one-dimensional square to magnetic stripe or the position of magnetic dot, but cannot carry out magnetic imaging to being arranged on magnetic stripe or the magnetic dot of two dimensional surface, and owing to being subject to the restriction of winding volume and sensitivity thereof, existing authentication detection technology cannot be realized two-dimentional false distinguishing demand at all.
In addition, coil type Magnetic Sensor also has that sensitivity is low, low-response, resolution are low, stability and the defect such as reliability is poor, causes existing financial fake identifying machine more and more can not adapt to the development need of financial circles.
Summary of the invention
The technical problem to be solved in the present invention is exactly the above-mentioned defect existing for traditional Magnetic Sensor, and a kind of magnetic image sensor and false distinguishing method are provided, and it can meet two-dimentional false distinguishing demand.
The technical scheme adopting solving the problems of the technologies described above is to provide a kind of magnetic image sensor, comprise magnetic sensor chip, described magnetic sensor chip comprises the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, angle theta between described the first magnetic susceptibility unit dot matrix and described the second magnetic susceptibility unit dot matrix is 180 ° of 0 < θ <, described the first magnetic susceptibility unit dot matrix and described the second magnetic susceptibility unit dot matrix comprise respectively N and M magnetic susceptibility unit, described magnetic susceptibility unit is the wheatstone bridge circuits of being made by magnetic sensitive film, wherein, N, M is >=1 integer.
Wherein, described the first magnetic susceptibility unit dot matrix comprises n * m described magnetic susceptibility unit, and described magnetic susceptibility unit transverse arranges, the integer that m, n are >=1;
Described the second magnetic susceptibility unit dot matrix comprises a * b described magnetic susceptibility unit, and described magnetic susceptibility unit longitudinally arranges, the integer that a, b are >=1.
Wherein, described magnetic susceptibility unit comprises that at least one pair of is parallel to each other and the magnetic sensitive film of pinning opposite direction, and the spacing of described magnetic susceptibility unit is two distances between described magnetic sensitive film, the symcenter of described magnetic susceptibility unit is the symcenter of two described magnetic sensitive films on its length direction.
Wherein, the spacing of the n * m in described the first magnetic susceptibility unit dot matrix described magnetic susceptibility unit equates; The spacing of a * b in described the second magnetic susceptibility unit dot matrix described magnetic susceptibility unit equates.
Wherein, the spacing of the n * m in described the first magnetic susceptibility unit dot matrix described magnetic susceptibility unit is not exclusively equal; The spacing of a * b in described the second magnetic susceptibility unit dot matrix described magnetic susceptibility unit is not exclusively equal.
Wherein, the spacing of the n * m in described the first magnetic susceptibility unit dot matrix described magnetic susceptibility unit equates; The spacing of a * b in described the second magnetic susceptibility unit dot matrix described magnetic susceptibility unit is unequal; Or,
The spacing of the n * m in described the first magnetic susceptibility unit dot matrix described magnetic susceptibility unit is unequal; The spacing of a * b in described the second magnetic susceptibility unit dot matrix described magnetic susceptibility unit equates.
Wherein, in described the first magnetic susceptibility unit dot matrix, the symcenter of magnetic susceptibility unit is on same straight line described in each in every row magnetic susceptibility unit.
Wherein, in described the first magnetic susceptibility unit dot matrix, the symcenter of magnetic susceptibility unit is not exclusively on same straight line described in each in every row magnetic susceptibility unit.
Wherein, in described the second magnetic susceptibility unit dot matrix, the symcenter of magnetic susceptibility unit is on same straight line described in each in every row magnetic susceptibility unit.
Wherein, in described the second magnetic susceptibility unit dot matrix, the symcenter of magnetic susceptibility unit is not exclusively on same straight line described in each in every row magnetic susceptibility unit.
Wherein, in described the first magnetic susceptibility unit dot matrix, m be listed as described magnetic susceptibility unit described magnetic sensor chip there is not in a lateral direction gap, with laterally covering completely described magnetic sensor chip;
In described the second magnetic susceptibility unit dot matrix, described in a is capable will there is not gap in magnetic susceptibility unit on the longitudinal direction of described magnetic sensor chip, with longitudinally covering completely described magnetic sensor chip.
Wherein, in described the first magnetic susceptibility unit dot matrix, m is listed as described magnetic susceptibility unit and has in a lateral direction a gap at described magnetic sensor chip;
In described the second magnetic susceptibility unit dot matrix, described in a is capable there is gap in magnetic susceptibility unit on the longitudinal direction of described magnetic sensor chip.
Wherein, described wheatstone bridge circuits is Hui Sitong half-bridge circuit, or described wheatstone bridge circuits is Hui Sitong full-bridge circuit, and described in each, wheatstone bridge circuits is provided with a difference output channel.
Wherein, described magnetic sensitive film is continuous continual film.
Wherein, described magnetic sensitive film comprises multistage film section, and described film section is by conductor series connection.
Wherein, described magnetic sensitive film is linear pattern film or crooked snakelike film.
Wherein, described magnetic sensitive film is Hall effect film, anisotropic magnetoresistance film, giant magnet resistance film, tunnel magneto resistance film, giant magnetoresistance films or giant Hall effect film.
Wherein, also comprise printed circuit board, capillary, screening can and data processing unit,
Described magnetic susceptibility chip is electrically connected to described printed circuit board;
On described screening can, be provided with magnetic conduction window, described magnetic susceptibility chip and described printed circuit board are arranged in described screening can, and described magnetic susceptibility unit is relative with described magnetic conduction window;
Described printed circuit board is fixed in one end of described capillary, and is electrically connected to the difference output end of wheatstone bridge circuits in described magnetic susceptibility chip
Described data processing unit receives the differential signal of described wheatstone bridge circuits by described capillary, and obtains magnetic mark according to described differential signal.
Wherein, described screening can adopts Ferrite Material or permalloy material to make, or adopts metal material to make, and applies on its surface the coating of being made by Ferrite Material or permalloy material.
The present invention also provides a kind of false distinguishing method, comprises the following steps:
Obtain magnetic image sensor, described magnetic image sensor is magnetic image sensor provided by the invention;
By described magnetic image sensor, obtain differential signal;
According to described differential signal, distinguish magnetic mark, thus the Distribution of Magnetic Field figure on thing to be checked surface.
The present invention has following beneficial effect:
Magnetic image sensor provided by the invention, magnetic sensor chip wherein comprises the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, angle theta between described the first magnetic susceptibility unit dot matrix and described the second magnetic susceptibility unit dot matrix is 180 ° of 0 < θ <, described the first magnetic susceptibility unit dot matrix and described the second magnetic susceptibility unit dot matrix comprise respectively N and M magnetic susceptibility unit, and described magnetic susceptibility unit is the wheatstone bridge circuits of being made by magnetic sensitive film.Owing to adopting magnetic sensitive film to make magnetic susceptibility unit, its volume is little, is easy to integratedly, can in limited area, make a plurality of magnetic susceptibilities unit, obtains magnetic susceptibility unit dot matrix.According to iconology principle, by two magnetic susceptibility unit dot matrix, can obtain the two dimensional surface distribution collection of illustrative plates in thing internal magnetic field to be checked source, the magnetic stripe of two dimensional surface or magnetic dot are carried out to magnetic imaging, thereby more thoroughly, all sidedly anti-false sign is identified, and then can identify more accurately the true and false of thing to be checked.And size and the extraneous magnetic signal power of the differential signal that the wheatstone bridge circuits consisting of inductive magnetic thin film obtains are proportional, therefore, magnetic sensor chip not only can obtain the position of Magnetic Field Source, and can obtain the power of extraneous magnetic signal.In addition, the advantage such as that this magnetic image sensor has is simple in structure, cost is low, volume is little, thin thickness and sensitivity height, makes magnetic image sensor can adapt to many demands for development such as microminiaturization, integrated, low-power consumption and high-performance.
False distinguishing method provided by the invention, owing to having adopted magnetic image sensor provided by the invention, differentiate the true and false of thing to be checked, therefore can carry out magnetic imaging to the Magnetic Field Source in thing two dimensional surface to be checked, thereby more thoroughly, all sidedly anti-false sign is identified, thus identify more accurately the true and false of thing to be checked.
Accompanying drawing explanation
Fig. 1 is the sectional view of the Magnetic Sensor of existing financial fake identifying machine employing;
Fig. 2 a is the stereographic map of embodiment of the present invention finance fake identifying machine Magnetic Sensor;
Fig. 2 b is the exploded view of embodiment of the present invention finance fake identifying machine Magnetic Sensor;
Fig. 3 a is the structural representation of the embodiment of the present invention the first magnetic susceptibility unit dot matrix, wherein, the symcenter of each magnetic susceptibility unit in every row magnetic susceptibility unit is all on same straight line, the spacing of magnetic susceptibility unit all equates, and every row magnetic susceptibility unit is laterally not exclusively covering magnetic sensor chip all;
Fig. 3 b is the structural representation of the embodiment of the present invention the first magnetic susceptibility unit dot matrix, wherein, the symcenter of each magnetic susceptibility unit in every row magnetic susceptibility unit is all on same straight line, the spacing of magnetic susceptibility unit is not exclusively equal, and every row magnetic susceptibility unit is all by the horizontal covering of magnetic sensor chip;
Fig. 3 c is the structural representation of another embodiment of the present invention magnetic susceptibility unit dot matrix, wherein, the symcenter of each magnetic susceptibility unit in every row magnetic susceptibility unit is not on same straight line, the spacing of magnetic susceptibility unit equates, and every row magnetic susceptibility unit is laterally covering magnetic sensor chip completely all;
Fig. 3 d is the structural representation of further embodiment of this invention magnetic susceptibility unit dot matrix, wherein, the symcenter of each magnetic susceptibility unit in every row magnetic susceptibility unit is not exclusively on same straight line, the spacing of magnetic susceptibility unit is not exclusively equal, and every row magnetic susceptibility unit is laterally covering magnetic sensor chip completely all;
Fig. 3 e is the structural representation of further embodiment of this invention magnetic susceptibility unit dot matrix, wherein, the symcenter of each magnetic susceptibility unit in every row magnetic susceptibility unit is on same straight line, the spacing of magnetic susceptibility unit is successively decreased successively, and every row magnetic susceptibility unit is laterally covering magnetic sensor chip completely all;
Fig. 3 f is the structural representation of magnetic susceptibility unit dot matrix in embodiment of the present invention Hui Sitong full-bridge circuit, wherein, the symcenter of each magnetic susceptibility unit in every row magnetic susceptibility unit is on same straight line, and the spacing of magnetic susceptibility unit all equates, and every row magnetic susceptibility unit all passes magnetic
Fig. 4 a is the schematic diagram of embodiment of the present invention Hui Sitong half-bridge circuit;
Fig. 4 b is the schematic diagram of embodiment of the present invention Hui Sitong full-bridge circuit;
Fig. 5 is the structural representation of another embodiment of the present invention magnetic susceptibility unit;
Fig. 6 is the structural representation of the embodiment of the present invention the second magnetic susceptibility unit dot matrix.
Embodiment
For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with accompanying drawing, magnetic image sensor provided by the invention and false distinguishing method are described in detail.
Magnetic image sensor provided by the invention comprises magnetic sensor chip, magnetic sensor chip comprises 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 180 ° of 0 < θ <, the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix comprise respectively N and M magnetic susceptibility unit, described magnetic susceptibility unit is the wheatstone bridge circuits of being made by magnetic sensitive film, wherein, the integer that N, M are >=1.
This magnetic image sensor can be for the cash inspecting machine of financial field, and as differentiated, the true and false of banknote is, the true and false of bill; Also can be for other fields such as trade mark, commodity, as differentiated the true and false of trade mark.Also it should be noted that, the sensor that the present embodiment provides, owing to can obtaining the plane distribution collection of illustrative plates of thing internal magnetic field field source to be checked, therefore, is referred to as sensor into magnetic chart shape sensor.
The magnetic image sensor that financial field used of take is below introduced magnetic image sensor provided by the invention as example.
Fig. 2 a is the stereographic map of embodiment of the present invention magnetic image sensor, and Fig. 2 b is the exploded view of embodiment of the present invention magnetic image sensor.See also Fig. 2 a and Fig. 2 b, magnetic image sensor provided by the invention comprises shield shell 1, magnetic sensor chip 2, printed circuit board (PCB) 4, insulation gap 5 and capillary 41, and magnetic sensor chip 2 is fixed on printed circuit board (PCB) 4 and with printed circuit board (PCB) 4 and is electrically connected to.Magnetic sensor chip 2 and printed circuit board (PCB) 4 are arranged in shield shell 1.On shield shell 1, be provided with magnetic conductive hole 3, magnetic sensor chip 2 is relative with the position of magnetic conductive hole 3, and magnetic sensor chip 2 receives extraneous magnetic signal by magnetic conductive hole 3.In addition, the top of magnetic sensor chip 2 is lower than the upper surface of shield shell 1, shield shell 1 can will be parallel to the extraneous magnetic signal shielding of magnetic sensor chip 2 sensitive surface like this, make magnetic sensor chip 2 only receive the extraneous magnetic signal perpendicular with the sensitive surface of magnetic sensor chip 2, to improve sensitivity and the antijamming capability of magnetic image sensor.
The present embodiment magnetic sensor chip comprises 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 90 °, and the first magnetic susceptibility unit dot matrix is mutually vertical with the second magnetic susceptibility unit dot matrix.In other embodiments, angle theta between the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix can be 15 °, 30 °, 45 °, 60 °, 85 °, 100 °, 135 °, 150 °, 165 ° or 185 °, position and the size in two dimensional surface internal magnetic field source by the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, can be detected, not only can obtain the position of magnetic stripe or magnetic dot, can also obtain the length of magnetic stripe.
Fig. 3 a is the structural representation of the embodiment of the present invention the first magnetic susceptibility unit dot matrix.As shown in Figure 3 a, the first magnetic susceptibility unit dot matrix comprises 9 magnetic susceptibility unit, and with 3 * 3 array way settings, particularly, the first magnetic susceptibility unit dot matrix is provided with 3 row magnetic susceptibility unit, and every row includes 3 row magnetic susceptibility unit.Magnetic susceptibility unit transverse arranges, and in other words, magnetic susceptibility unit horizontal arranges.
It should be noted that, in actual applications, the first magnetic susceptibility unit dot matrix can arrange any number of magnetic susceptibilities unit as required, that is, the first magnetic susceptibility unit dot matrix can comprise N magnetic susceptibility unit, wherein, and the integer that N is >=1.Be appreciated that the first magnetic susceptibility unit dot matrix can according to the quantity of magnetic susceptibility unit be arranged to n capable * m row, wherein, the integer that m, n are >=1, as 2 * 5 magnetic susceptibility unit, 4 * 3 magnetic susceptibility unit or 1 * 2 magnetic susceptibility unit.
Magnetic susceptibility unit comprises a pair of being parallel to each other and the magnetic sensitive film of pinning opposite direction i.e. the first magnetic sensitive film 31a and the second magnetic sensitive film 31b, between the first magnetic sensitive film 31a and the second magnetic sensitive film 31b, in a distance, this distance can be set according to the sensitivity of magnetic image sensor.Normal conditions, the distance between the first magnetic sensitive film 31a and the second magnetic sensitive film 31b can be 5～30 μ m, preferably 5～20 μ m.Certainly, the spacing of magnetic susceptibility unit also can arrange according to actual requirement greater or lesser.
In the present embodiment, spacing between the first magnetic sensitive film 31a and the second magnetic sensitive film 31b is referred to as to the spacing of magnetic susceptibility unit, by the first magnetic sensitive film 31a and the second magnetic sensitive film 31b, the symcenter on its length direction is referred to as the symcenter of magnetic susceptibility unit.
The present embodiment by the first magnetic susceptibility unit dot matrix horizontally set, that is, is horizontally disposed with the symcenter of each magnetic susceptibility unit in the first magnetic susceptibility unit dot matrix.And the spacing of 3 * 3 magnetic susceptibility unit in the first magnetic susceptibility unit dot matrix all equates.
In actual applications, the spacing of the magnetic susceptibility unit in the first magnetic susceptibility unit dot matrix also can be not exclusively equal.As shown in Figure 3 b, the spacing of the spacing of secondary series magnetic susceptibility unit and first row magnetic susceptibility unit, the 3rd row magnetic susceptibility unit is not etc.Be understood that, the spacing of the different magnetic susceptibilities unit in same row magnetic susceptibility unit can equate, also can be unequal.
In the present embodiment, the spacing of magnetic susceptibility unit is less, and the sensitivity of magnetic sensor chip is higher.Therefore,, in magnetic sensor chip, can determine according to the power of magnetic mark in thing to be checked the spacing of magnetic susceptibility unit.
In the present embodiment, in the first magnetic susceptibility unit dot matrix, the symcenter of every row magnetic susceptibility unit is on same straight line, as shown in Figure 3 a, the symcenter of magnetic susceptibility unit N11, N12, N13 is on same straight line, the symcenter of magnetic susceptibility unit N21, N22, N23 is on same straight line, and the symcenter of magnetic susceptibility unit N31, N32, N33 is on same straight line.
In another embodiment, in the first magnetic susceptibility unit dot matrix, the symcenter of every row magnetic susceptibility unit is not exclusively on same straight line.As shown in Figure 3 c, the symcenter of magnetic susceptibility unit N11, N12, N13 is not all on same straight line, the symcenter of magnetic susceptibility unit N21, N22, N23 is not all on same straight line, and the symcenter of magnetic susceptibility unit N31, N32, N33 is not all on same straight line.
In an embodiment again, as shown in Figure 3 d, in the first row magnetic susceptibility unit, the symcenter of the symcenter of magnetic susceptibility unit N13 and magnetic susceptibility unit N11, N12 is not on same straight line, the symcenter of the symcenter of magnetic susceptibility unit N23 and magnetic susceptibility unit N21, N22 is not on same straight line, and the symcenter of the symcenter of magnetic susceptibility unit N33 and magnetic susceptibility unit N31, N32 is not all on same straight line.
In the present embodiment, at magnetic sensor chip in a lateral direction, between magnetic susceptibility unit N11, N12, N13, all have gap, that is to say, magnetic susceptibility unit N11, N12, N13 do not cover the horizontal direction of magnetic sensor chip completely.
In another embodiment, as Fig. 3 b, 3c, shown in 3d, at magnetic sensor chip in a lateral direction, between magnetic susceptibility unit N11 and magnetic susceptibility unit N12, between magnetic susceptibility unit N12 and magnetic susceptibility unit N13, there is not gap, the tail end that is the magnetic susceptibility film of magnetic susceptibility unit N11 is connected mutually with the head end of the magnetic susceptibility film of magnetic susceptibility unit N12, the tail end of the magnetic susceptibility film of magnetic susceptibility unit N12 is connected mutually with the head end of the magnetic susceptibility film of magnetic susceptibility unit N13, magnetic susceptibility unit N11 and magnetic susceptibility unit N12 and magnetic susceptibility unit N13 and some array element laterally covering completely magnetic sensor chip thereof.When utilizing this magnetic image sensor to distinguish banknote, the horizontal magnetic sensor chip that covers magnetic sensor chip completely can cover banknote completely in a direction, thereby can avoid undetected or have the defects such as dead zone.
As shown in Figure 3 e, in three magnetic susceptibility unit of the first row magnetic susceptibility unit, the spacing of magnetic susceptibility unit N12 is less than the spacing of magnetic susceptibility unit N11, and the spacing of magnetic susceptibility unit N13 is less than the spacing of magnetic susceptibility unit N12, that is, the spacing of magnetic susceptibility unit N11, N12, N13 is successively decreased successively.Certainly, in three magnetic susceptibility unit of the first row magnetic susceptibility unit, the spacing of magnetic susceptibility unit N11, N12, N13 increases progressively successively.Or as shown in Figure 3 b, the spacing of magnetic susceptibility unit N11, N12, N13 first reduces rear increase.Or as shown in Figure 3 d, the spacing of magnetic susceptibility unit N11 is greater than the spacing of magnetic susceptibility unit N12, N13, the spacing of magnetic susceptibility unit N12 and magnetic susceptibility unit N13 equates.
The set-up mode of the second row magnetic susceptibility unit and the third line magnetic susceptibility unit is identical with the first row magnetic susceptibility unit, does not repeat them here.
In the present embodiment, magnetic susceptibility unit is to be electrically connected to by the first magnetic sensitive film 31a and the second magnetic sensitive film 31b the Hui Sitong half-bridge circuit forming.In actual applications, magnetic susceptibility unit is also provided with for being electrically connected to the first electrode 32a of the first magnetic sensitive film 31a and the second magnetic sensitive film 31b, the second electrode 32b and public electrode 33a, wherein, public electrode 33a is electrically connected to one end of the first magnetic sensitive film 31a and the second magnetic sensitive film 31b, the first electrode 32a and the second electrode 32b are electrically connected to the other end of the first magnetic sensitive film 31a and the second magnetic sensitive film 31b respectively, thereby obtain Hui Sitong half-bridge circuit, and first electrode 32a and public electrode 33a or the second electrode 31b and public electrode 33a as the difference output end of Hui Sitong half-bridge circuit, or perhaps difference output channel.The structural portion of other each magnetic susceptibility unit is identical, does not repeat them here.
Fig. 4 a is the topological diagram of embodiment of the present invention Hui Sitong half-bridge circuit.As shown in Fig. 4 a, arrow represents the pinning opposite direction of the first magnetic sensitive film 31a and the second magnetic sensitive film 31b.Three terminal A, B, C distinguish the first electrode 32a, the second electrode 32b and public electrode 33a in corresponding diagram 3a.Wherein, terminal B and end points C or terminal A and end points C are as the difference output end of Hui Sitong half-bridge circuit.Proportional for the power of false proof magnetic sign on the differential signal being obtained by Hui Sitong half-bridge circuit and thing to be checked, whether it not only can be differentiated magnetic sign, and can differentiate the power of magnetic sign, thereby obtains more accurately magnetic identification information.
In another embodiment of the present invention, magnetic susceptibility unit is Hui Sitong full-bridge circuit, utilizes magnetic sensitive film to obtain Hui Sitong full-bridge circuit.As shown in Fig. 3 f, favour stone full-bridge circuit comprises the first magnetic sensitive film 31a, the second magnetic sensitive film 31b, the 3rd magnetic sensitive film 31c skill the 4th magnetic sensitive film 31d, the first electrode 32a, the second electrode 32b, the first public electrode 33a and the second public electrode 33b.Wherein, the first magnetic sensitive film 31a be parallel to each other with the second magnetic sensitive film 31b and pinning direction identical, the 3rd magnetic sensitive film 31c be parallel to each other with the 4th magnetic sensitive film 31d and pinning direction identical, and, the pinning opposite direction of the pinning direction of the first magnetic sensitive film 31a and the second magnetic sensitive film 31b and the 3rd magnetic sensitive film 31c and the 4th magnetic sensitive film 31d.The first public electrode 33a is electrically connected to one end of the first magnetic sensitive film 31a and the 3rd magnetic sensitive film 31c, the second public electrode 33b is electrically connected to the other end of the second magnetic sensitive film 31b and the 3rd magnetic sensitive film 31c, the first electrode 32a and the second electrode 32b respectively with the first magnetic sensitive film 31a and the 3rd magnetic sensitive film 31c, the second magnetic sensitive film 31b and the 4th magnetic sensitive film 31d are electrically connected to.
In an embodiment more of the present invention, Hui Sitong full-bridge circuit consists of four magnetic sensitive films, and every magnetic sensitive film is as an arm bridge of wheatstone bridge circuits.
Fig. 4 b is the topological diagram of embodiment of the present invention Hui Sitong full-bridge circuit.As shown in Figure 4 b, arrow represents that the first magnetic sensitive film 31a is identical with the pinning direction of the second magnetic sensitive film 31b.The 3rd magnetic sensitive film 31c is identical with the pinning direction of the 4th magnetic sensitive film 31d, and four terminal A, B, C, D distinguish the first electrode 32a, the second electrode 32b, the first public electrode 33a and the second public electrode 33b in corresponding diagram 3f.Wherein, terminal B and end points C are as the difference output end of Hui Sitong full-bridge circuit.Proportional for the power of false proof magnetic sign on the differential signal being obtained by Hui Sitong full-bridge circuit and thing to be checked, whether it not only can be differentiated magnetic sign, and can differentiate the power of magnetic sign, thereby obtains more accurately magnetic identification information.
In addition, in the above-described embodiments, the magnetic sensitive film that forms magnetic susceptibility unit is linear pattern film.Yet the present invention is not limited thereto.Magnetic sensitive film also can be for bending snakelike, as shown in Figure 5, magnetic sensitive film 31a, 31b are fold-line-shaped, public electrode 33a is electrically connected to one end of magnetic sensitive film 31a and magnetic sensitive film 31b, and the first electrode 32a and the second electrode 32b are electrically connected to the other end of magnetic sensitive film 31a and magnetic sensitive film 31b respectively.Certainly, magnetic sensitive film also can adopt other broken line shape, and the shaped form as level and smooth, will not enumerate at this.
The present embodiment is provided with M magnetic susceptibility unit in the second magnetic susceptibility unit dot matrix, the integer that M is >=1, and also magnetic susceptibility unit longitudinally arranges.
Certainly, in the second magnetic susceptibility unit dot matrix, the concrete numerical value of M is determined according to the anti-counterfeiting mark arranging in reality thing to be checked, and M can equate with N, also can not wait.
By M magnetic susceptibility unit according to a capable * b column array arranges, the integer that a, b are >=1.The structure of M magnetic susceptibility unit in the second magnetic susceptibility unit dot matrix is identical with the structure of magnetic susceptibility unit in the first magnetic susceptibility unit dot matrix, as, the spacing of a * b magnetic susceptibility unit in the second magnetic susceptibility unit dot matrix equates or is not exclusively equal.And for example, the symcenter of each magnetic susceptibility unit in every row magnetic susceptibility unit is on same straight line, or not exclusively on same straight line.For another example, will there is not gap in the capable magnetic susceptibility of a unit on the longitudinal direction of magnetic sensor chip, with by longitudinally the covering completely of magnetic sensor chip, or the capable magnetic susceptibility of a unit exists gap on the longitudinal direction of magnetic sensor chip.The feature of the magnetic susceptibility unit of mentioning in the first magnetic susceptibility unit dot matrix may be used to the second magnetic susceptibility unit dot matrix.
Only enumerating an example second magnetic susceptibility unit dot matrix is below introduced.As shown in Figure 6, be the structural representation of the embodiment of the present invention the second magnetic susceptibility unit dot matrix.The second magnetic susceptibility unit dot matrix comprises 3 * 3 magnetic susceptibility unit, magnetic susceptibility unit longitudinally arranges, magnetic susceptibility unit M11, M31, magnetic susceptibility unit M12, M32 equate with the spacing of magnetic susceptibility unit M13, M33, magnetic susceptibility unit M21, magnetic susceptibility unit M22, with magnetic susceptibility unit M23 than other magnetic susceptibility unit M11, the spacing of M13, M21, M23, M31, M33 is little.The symcenter of first row magnetic susceptibility unit M11, M12, M13 is on same straight line, and the symcenter of secondary series magnetic susceptibility unit M21, M22, M23 is on same straight line, and the symcenter of the 3rd row magnetic susceptibility unit M31, M32, M33 is on same straight line.
As another embodiment of the present invention, on the longitudinal direction of magnetic sensor chip, magnetic susceptibility unit M11, M21, M31 covers the longitudinal direction of magnetic sensor chip completely, magnetic susceptibility unit M, 21, M22, M32 covers the longitudinal direction of magnetic sensor chip completely, magnetic susceptibility unit M31, M32, M33 covers the longitudinal direction of magnetic sensor chip completely, be that every row magnetic susceptibility unit does not exist gap on the longitudinal direction of magnetic sensor chip, as in first row magnetic susceptibility unit, the tail end of the magnetic susceptibility film of magnetic susceptibility unit M11 is connected mutually with the head end of the magnetic susceptibility film of magnetic susceptibility unit M21, the tail end of the magnetic susceptibility film of magnetic susceptibility unit M21 is connected mutually with the head end of the magnetic susceptibility film of magnetic susceptibility unit M31, the linking situation of other each row magnetic susceptibility unit is also identical, whole magnetic susceptibility unit dot matrix longitudinally covers completely by magnetic sensor chip.
It should be noted that, in magnetic sensor chip, can be by the magnetic susceptibility unit in the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix according to following manner setting, that is, the spacing of n * m magnetic susceptibility unit in the first magnetic susceptibility unit dot matrix equates; The spacing of a * b magnetic susceptibility unit in the second magnetic susceptibility unit dot matrix is unequal.Or the spacing of n * m magnetic susceptibility unit in the first magnetic susceptibility unit dot matrix is unequal; The spacing of a * b magnetic susceptibility unit in the second magnetic susceptibility unit dot matrix equates.The further feature that is appreciated that magnetic susceptibility unit also can be as the spacing of magnetic susceptibility unit cross-reference in the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix respectively.
In the present embodiment, the same Ke Yi Wei Hui Sitong full-bridge circuit of the second magnetic susceptibility unit dot matrix or Hui Sitong half-bridge circuit.
In the present embodiment, magnetic sensitive film can, for continuous continual film, also can comprise multistage film section, and adjacent film section be electrically connected to by conductor.Magnetic sensitive film is Hall effect film, anisotropic magnetoresistance film, giant magnet resistance film, tunnel magneto resistance film, giant magnetoresistance films or giant Hall effect film.
Magnetic image sensor provided by the invention also comprises data processing unit (not shown), data processing unit is for the differential signal of the wheatstone bridge circuits that receives, and according to differential signal, distinguishes the size of the position of magnetic mark, the power of magnetic mark and magnetic mark.
In the present embodiment, screening can adopt Ferrite Material or permalloy material to make, or adopts metal material to make, and applies on its surface the coating of being made by Ferrite Material or permalloy material.
It is to be noted, in the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, the quantity of magnetic susceptibility unit and setting position can also be set according to the position that is arranged on the magnetic mark in thing to be checked, for example, in thing to be checked, be provided with three magnetic marks, so only at the first magnetic susceptibility unit dot matrix, with the position relative with these three magnetic marks in the second magnetic susceptibility unit dot matrix, magnetic induction unit is set, can improves equally the accuracy of false distinguishing.
The magnetic image sensor that the present embodiment provides, magnetic sensor chip wherein comprises the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, angle theta between described the first magnetic susceptibility unit dot matrix and described the second magnetic susceptibility unit dot matrix is 180 ° of 0 < θ <, described the first magnetic susceptibility unit dot matrix and described the second magnetic susceptibility unit dot matrix comprise respectively N and M magnetic susceptibility unit, and described magnetic susceptibility unit is the wheatstone bridge circuits of being made by magnetic sensitive film.Owing to adopting magnetic sensitive film to make magnetic susceptibility unit, its volume is little, is easy to integratedly, can in limited area, make a plurality of magnetic susceptibilities unit, obtains magnetic susceptibility unit dot matrix.According to iconology principle, by two magnetic susceptibility unit dot matrix, can obtain the plane distribution collection of illustrative plates of thing internal magnetic field field source to be checked, obtain position, power and the size of magnetic anti-false sign, thereby more thoroughly, all sidedly anti-false sign is identified, and then identify more accurately the true and false of thing to be checked.And size and the extraneous magnetic signal power of the differential signal that the wheatstone bridge circuits consisting of inductive magnetic thin film obtains are proportional, therefore, magnetic sensor chip not only can obtain the position of Magnetic Field Source, and can obtain the power of extraneous magnetic signal.In addition, the advantage such as that this magnetic image sensor has is simple in structure, cost is low, volume is little, thin thickness and sensitivity height, makes magnetic image sensor can adapt to many demands for development such as microminiaturization, integrated, low-power consumption and high-performance.
The present embodiment also provides a kind of false distinguishing method, comprises the following steps:
Step S1, obtains magnetic image sensor.
The magnetic image sensor that magnetic image sensor adopts the present embodiment to provide, the specific features of magnetic image sensor, referring to above, is not described in detail at this.
Step S2, obtains differential signal by magnetic image sensor.
The magnetic field of induced magnetism mark can make the wheatstone bridge circuits in magnetic image sensor produce differential signal, and the size of differential signal is corresponding with the power of magnetic mark.
Step S3, distinguishes magnetic mark according to differential signal, thus the Distribution of Magnetic Field figure on thing to be checked surface.
According to differential signal, not only the position of magnetic mark can be distinguished, and power and the size of magnetic mark can be distinguished.And, by the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, can carry out two-dimensional imaging to being arranged on the magnetic mark of diverse location in thing to be checked, thereby improve the accuracy of false distinguishing.
The false distinguishing method that the present embodiment provides, owing to having adopted magnetic image sensor provided by the invention, differentiate the true and false of thing to be checked, therefore can obtain the distribution collection of illustrative plates of thing internal magnetic field field source to be checked, thereby more thoroughly, all sidedly anti-false sign is identified, thus identify more accurately the true and false of thing to be checked.
Be understandable that, above embodiment is only used to principle of the present invention is described and the illustrative embodiments that adopts, yet 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 (20)
1. a magnetic image sensor, comprise magnetic sensor chip, it is characterized in that, described magnetic sensor chip comprises the first magnetic susceptibility unit dot matrix and the second magnetic susceptibility unit dot matrix, angle theta between described the first magnetic susceptibility unit dot matrix and described the second magnetic susceptibility unit dot matrix is 180 ° of 0 < θ <, described the first magnetic susceptibility unit dot matrix and described the second magnetic susceptibility unit dot matrix comprise respectively N and M magnetic susceptibility unit, described magnetic susceptibility unit is the wheatstone bridge circuits of being made by magnetic sensitive film, wherein, N, M is >=1 integer.
2. magnetic image sensor according to claim 1, is characterized in that, described the first magnetic susceptibility unit dot matrix comprises n * m described magnetic susceptibility unit, and described magnetic susceptibility unit transverse arranges, the integer that m, n are >=1;
Described the second magnetic susceptibility unit dot matrix comprises a * b described magnetic susceptibility unit, and described magnetic susceptibility unit longitudinally arranges, the integer that a, b are >=1.
3. magnetic image sensor according to claim 2, it is characterized in that, described magnetic susceptibility unit comprises that at least one pair of is parallel to each other and the magnetic sensitive film of pinning opposite direction, and the spacing of described magnetic susceptibility unit is two distances between described magnetic sensitive film, the symcenter of described magnetic susceptibility unit is the symcenter of two described magnetic sensitive films on its length direction.
4. magnetic image sensor according to claim 3, is characterized in that, the spacing of the n * m in described the first magnetic susceptibility unit dot matrix described magnetic susceptibility unit equates; The spacing of a * b in described the second magnetic susceptibility unit dot matrix described magnetic susceptibility unit equates.
5. magnetic image sensor according to claim 3, is characterized in that, the spacing of the n * m in described the first magnetic susceptibility unit dot matrix described magnetic susceptibility unit is not exclusively equal; The spacing of a * b in described the second magnetic susceptibility unit dot matrix described magnetic susceptibility unit is not exclusively equal.
6. magnetic image sensor according to claim 3, is characterized in that, the spacing of the n * m in described the first magnetic susceptibility unit dot matrix described magnetic susceptibility unit equates; The spacing of a * b in described the second magnetic susceptibility unit dot matrix described magnetic susceptibility unit is unequal; Or,
The spacing of the n * m in described the first magnetic susceptibility unit dot matrix described magnetic susceptibility unit is unequal; The spacing of a * b in described the second magnetic susceptibility unit dot matrix described magnetic susceptibility unit equates.
7. magnetic image sensor according to claim 3, is characterized in that, in described the first magnetic susceptibility unit dot matrix, the symcenter of magnetic susceptibility unit is on same straight line described in each in every row magnetic susceptibility unit.
8. magnetic image sensor according to claim 3, is characterized in that, in described the first magnetic susceptibility unit dot matrix, the symcenter of magnetic susceptibility unit is not exclusively on same straight line described in each in every row magnetic susceptibility unit.
9. magnetic image sensor according to claim 3, is characterized in that, in described the second magnetic susceptibility unit dot matrix, the symcenter of magnetic susceptibility unit is on same straight line described in each in every row magnetic susceptibility unit.
10. magnetic image sensor according to claim 3, is characterized in that, in described the second magnetic susceptibility unit dot matrix, the symcenter of magnetic susceptibility unit is not exclusively on same straight line described in each in every row magnetic susceptibility unit.
11. magnetic image sensors according to claim 2, it is characterized in that, in described the first magnetic susceptibility unit dot matrix, m be listed as described magnetic susceptibility unit described magnetic sensor chip there is not in a lateral direction gap, with laterally covering completely described magnetic sensor chip;
In described the second magnetic susceptibility unit dot matrix, described in a is capable will there is not gap in magnetic susceptibility unit on the longitudinal direction of described magnetic sensor chip, with longitudinally covering completely described magnetic sensor chip.
12. magnetic image sensors according to claim 2, is characterized in that, in described the first magnetic susceptibility unit dot matrix, m is listed as described magnetic susceptibility unit and has in a lateral direction a gap at described magnetic sensor chip;
In described the second magnetic susceptibility unit dot matrix, described in a is capable there is gap in magnetic susceptibility unit on the longitudinal direction of described magnetic sensor chip.
13. magnetic image sensors according to claim 1, it is characterized in that, described wheatstone bridge circuits is Hui Sitong half-bridge circuit, or, described wheatstone bridge circuits is Hui Sitong full-bridge circuit, and described in each, wheatstone bridge circuits is provided with a difference output channel.
14. magnetic image sensors according to claim 1, is characterized in that, described magnetic sensitive film is continuous continual film.
15. magnetic image sensors according to claim 1, is characterized in that, described magnetic sensitive film comprises multistage film section, and described film section is by conductor series connection.
16. magnetic image sensors according to claim 1, is characterized in that, described magnetic sensitive film is linear pattern film or crooked snakelike film.
17. magnetic image sensors according to claim 1, is characterized in that, described magnetic sensitive film is Hall effect film, anisotropic magnetoresistance film, giant magnet resistance film, tunnel magneto resistance film, giant magnetoresistance films or giant Hall effect film.
18. according to the magnetic image sensor described in claim 1-17 any one, it is characterized in that, also comprises printed circuit board, capillary, screening can and data processing unit,
Described magnetic susceptibility chip is electrically connected to described printed circuit board;
On described screening can, be provided with magnetic conduction window, described magnetic susceptibility chip and described printed circuit board are arranged in described screening can, and described magnetic susceptibility unit is relative with described magnetic conduction window;
Described printed circuit board is fixed in one end of described capillary, and is electrically connected to the difference output end of wheatstone bridge circuits in described magnetic susceptibility chip
Described data processing unit receives the differential signal of described wheatstone bridge circuits by described capillary, and obtains magnetic mark according to described differential signal.
19. magnetic image sensors according to claim 18, it is characterized in that, described screening can adopts Ferrite Material or permalloy material to make, or adopts metal material or nonmetallic materials to make, and applies on its surface the coating of being made by Ferrite Material or permalloy material.
20. 1 kinds of false distinguishing methods, is characterized in that, comprise the following steps:
Obtain magnetic image sensor, described magnetic image sensor is the magnetic image sensor described in claim 1-19 any one;
By described magnetic image sensor, obtain differential signal;
According to described differential signal, distinguish magnetic mark, thereby obtain the Distribution of Magnetic Field figure on thing to be checked surface.
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