CN203118094U - Magnetic sensor - Google Patents
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- CN203118094U CN203118094U CN2013200352567U CN201320035256U CN203118094U CN 203118094 U CN203118094 U CN 203118094U CN 2013200352567 U CN2013200352567 U CN 2013200352567U CN 201320035256 U CN201320035256 U CN 201320035256U CN 203118094 U CN203118094 U CN 203118094U
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Abstract
The utility model discloses a magnetic sensor. The magnetic sensor is provided with a magnet and magnet-sensitive elements. The magnet-sensitive elements respond to the magnetic field generated by the magnet. A magnetic code in a bank note is magnetized by the magnet when passing through the surface of the magnetic sensor. A part of or a complete hysteresis loop process is achieved. The magnetic sensor then reads signals of corresponding magnetization processes for further identification. The magnet is shaped like a long strip. The horizontal width W of the magnet is no more than two thirds of the minimum magnetic code distance. The north and south poles of the magnet are perpendicular to the magnetic induction direction and the magnetic induction plane of the magnetic sensor. The horizontal magnetic field intensity enables the magnetic code to undergo a part of or a complete hysteresis loop process when the magnetic code horizontally passes through the magnetic sensor. The magnet can be a permanent magnet, a DC coil, an AC coil or an electromagnet. The magnet-sensitive elements are composed of two or four magnet-sensitive units. The magnetic sensor can detect the hysteresis loop characteristics of the magnetic code. The magnetic sensor which is not dependent on the strength of magnetic code signals enables high identification accuracy.
Description
Technical field
The utility model relates to financial magnetic authentication detection technology field, particularly relates to a kind ofly can identifying magnetic code magnetic hysteresis loop feature Magnetic Sensor.
Background technology
Currency is one of circulation market indispensable element, in order to ensure stablizing of financial circulation order, need carry out the currency true and false and differentiate.
Because currency in the printing process, can arrange and be distributed with a plurality of magnetic codes.Carry out the check of the currency true and false by checking these magnetic code features to carry out.In the prior art, the mode that the magnetic code feature is detected is magnetic and detects and optical characteristics detection two big classes.
The magnetic false distinguishing detects because advantages such as its quick machine examination easy to detect are widely used in currency.At present, financial magnetic false distinguishing has become one of the requisite means of the stable institute of financial circulation order of safeguarding.
The principle of magnetic false distinguishing is that the magnetic pin that arranges in the currency is detected, and comprises features such as magnetic field intensity and position distribution.Along with development of technology, financial magnetic authentication detection technology has experienced by currency examine speed and the too responsive inductive coil of detection spacing are developed into comparatively advanced Hall magnetic resistance.Yet Hall magnetic resistance low-intensity magnetic field reluctivity is extremely low, adds that its evaluation program need depend on the magnetic code signal intensity, thereby requires to have minimum detector gap, usually less than 0.1mm.Make signal change with the gap and other influence the factor of signal intensity and instability, occur card paper money rate height, rate of wear easily and reach greatly and press coin to take turns because of pressure a series of problems such as easy fracture greatly.
In addition, the Hall magnetic resistance can't simply easily be distinguished soft magnetism and Hard Magnetic because of it to magnetic direction response symmetry, as shown in Figure 1, and more fubaritic full hysteresis loop line feature.Can only judge with strong and weak absolute value or the ratio attempted with different magnetic code signals according to the geometry mechanical property of magnetic code unilaterally, cause to be competent at by the magnetic characteristic of comprehensive evaluation magnetic code thoroughly false proof important task to the strong dependency that influences magnetic code signal intensity factor and the uncertainty that the signal power is judged.Fact proved that the Hall magnetic resistance can't be differentiated the new edition counterfeit money that occurred in recent years.
Moreover the Hall magnetic resistance in leading market can't be avoided adjacent closely spaced magnetic code signal stack at present, causes the complicated of evaluation program.
In science and technology highly developed today, the magnetic field size and location of the true magnetic code of not so difficult forgery distribute, and add aforesaid uncertainty when conventional art is judged, bring challenges for the magnetic code false distinguishing.
So, the authentication detection technology that can differentiate the more technical characterictics of currency need be provided.And in fact, unless know seal paper money producer's magnetic code prescription and manufacturing process, the whole magnetic hysteresis loop features that want to copy fully all a plurality of true magnetic codes are very difficult really.Therefore, the size and location distribution of comparison magnetic code magnetic field can not be simply leaned in false distinguishing fully, and more requirement can qualitatively reach quantitatively soft or hard magnetic attribute and the magnetic hysteresis loop feature of identification magnetic code, to guarantee the uncertainty of the stable and reduction authentication method that signal is judged.
Therefore, at the prior art deficiency, provided a kind of Magnetic Sensor very necessary.
Summary of the invention
The purpose of this utility model is to avoid weak point of the prior art and a kind of Magnetic Sensor is provided, and this Magnetic Sensor can completely be distinguished the feature of the magnetic hysteresis loop of a plurality of magnetic codes settings that currency arranges.
Above-mentioned purpose of the present utility model realizes by following technical measures.
A kind of Magnetic Sensor is provided, be provided with magnet and magnet-sensitive element, described magnet-sensitive element responds the magnetic field that described magnet produces, magnetic code in the bank note is finished magnetic hysteresis loop process complete or part through Magnetic Sensor when surface by described magnet magnetization, and is identified by the signal that Magnetic Sensor reads corresponding magnetic history again.
Above-mentioned magnet is set to strip, the transverse width W of described magnet is no more than 2/3rds of minimum magnetic code spacing, the south poles of described magnet is perpendicular to magnetic induction direction and the magnetic inductor plane of Magnetic Sensor, and transverse field strength can allow magnetic code experience part or all of magnetic hysteresis loop process when the horizontal process Magnetic Sensor of edge.
Above-mentioned magnet is set to permanent magnet, dc coil, AC coil or electromagnet.
Above-mentioned magnet-sensitive element is made up of two or four magnetosensitive sense unit, and specification identical but response asymmetry in described magnetosensitive sense unit is in magnetic direction, and when described magnet-sensitive element was two, two described magnet-sensitive elements constituted the Hui Sitong half-bridge circuits; When described magnet-sensitive element was set to four, four described magnetosensitive sense unit constituted the Hui Sitong full-bridge circuit;
Described favour stone half-bridge circuit or described favour stone full-bridge circuit are symmetrically distributed in described magnet centerline both sides along the magnetic induction direction, and transverse width W and described center distance that the center distance that constitutes the described magnetosensitive sense unit of described favour stone half-bridge circuit or described favour stone full-bridge is less than or equal to described magnet are no more than 2/3rds of minimum magnetic code spacing.
The magnetic responsiveness of above-mentioned magnetosensitive sense unit is asymmetric or antisymmetry to magnetic direction, and the magnetosensitive sense unit that is arranged in magnet centerline one side with in opposite side magnetosensitive sense unit same magnetic direction is had opposite or different responses;
The magnetic direction that each described magnetosensitive sense unit detects is identical or opposite along the direction that magnet laterally moves with magnetic code.
Above-mentioned magnetosensitive sense unit is set to inductive coil, giant magnetoresistance, tunnel magnetoresistive, has different magnetoresistive film or the device of barber shop's formula conductive stripe.
Magnetic Sensor of the present utility model is provided with magnet and magnet-sensitive element, and described magnet-sensitive element responds the magnetic field that described magnet produces.Magnetic code is finished magnetic hysteresis loop process complete or part through Magnetic Sensor when surface by described magnet magnetization, and is identified by the signal that Magnetic Sensor reads corresponding magnetic history again.The utility model can be distinguished the magnetic hysteresis loop feature that magnetic code attribute and can quantizing is defined magnetic code and detect, and does not rely on the power of magnetic code signal, so have the high characteristics of the degree of accuracy of evaluation.
Description of drawings
The utility model is described in further detail to utilize accompanying drawing, but the content in the accompanying drawing does not constitute any restriction of the present utility model.
Fig. 1 is Hard Magnetic and the soft magnetism signal schematic representation that reads by to the nondistinctive Hall magnetoresistive transducer of magnetic direction.
Fig. 2 is the structural representation of a kind of Magnetic Sensor embodiment 1 of the present utility model.
Fig. 3 is that the transverse width of magnet is to the synoptic diagram that influences of signal stack.
Fig. 4 is the synoptic diagram that Hard Magnetic or soft magnetism magnetic code experience the magnetic history path during laterally through magnet.
Fig. 5 is that the coercive force Hard Magnetic magnetic code that can't be overcome by magnet and coercive force are zero the soft magnetism magnetic code signal schematic representation during from left to right by the utility model embodiment one described Magnetic Sensor.
Fig. 6 identifies resulting signal schematic representation by Magnetic Sensor of the present utility model to a magnetic code.
Fig. 7 identifies resulting signal schematic representation by Magnetic Sensor of the present utility model to a magnetic code.
Fig. 8 is that one group of magnetic code is through the resulting one group of magnetic code signal graph of Magnetic Sensor of the present utility model.
Fig. 9 is the signal table that one group of magnetic code signal shown in Figure 8 is carried out discriminatory analysis.
Figure 10 is the synoptic diagram that the transverse magnetic field of the used magnet of the utility model changes with distance and detection spacing.
In Fig. 2, comprise:
Embodiment
With the following Examples the utility model is further described.
A kind of Magnetic Sensor as shown in Figure 2, is provided with matrix 1, shell 2, wheatstone bridge circuits interface 3, magnet-sensitive element 4 and magnet 5.
The transverse width W of magnet 5 is no more than 2/3rds of minimum magnetic code spacing.Minimum magnetic code spacing is general knowledge known in this field, and the distance between two adjacent magnetic codes is the magnetic code spacing, and the spacing in all magnetic code spacings between adjacent two magnetic codes of numerical value minimum is minimum magnetic code spacing.The setting of the transverse width of magnet 5 is distortion or the changes that cause single magnetic code signal for fear of the stack of contiguous magnetic code signal, with convenient evaluation to signal and the raising accuracy to input.
As shown in Figure 3, the transverse width that has shown magnet 5 influence that stack causes to signal, therefrom as can be seen, adjacent magnetic code spacing is greater than 1.5 times of magnet width at least just can avoid signal overlap.
The south poles of magnet 5 is perpendicular to magnetic induction direction and the magnetic inductor plane of Magnetic Sensor, and transverse field strength can allow magnetic code experience part or all of magnetic hysteresis loop process when the horizontal process Magnetic Sensor of edge.
Magnet-sensitive element 4 is symmetrically distributed in the both sides of magnet 5 center lines.Distance represents that with normal pitch d0 normal pitch d0 is no more than the transverse width W of magnet 5 between magnet-sensitive element 4 centers.
Magnet-sensitive element 4 is made of two magnetosensitive sense unit.Two magnetosensitive sense unit specifications are identical, and two magnetosensitive sense unit constitute the Hui Sitong half-bridge circuit; Two magnetosensitive sense unit are symmetrically distributed in magnet 5 center line both sides along the magnetic induction direction, and the normal pitch between two magnetosensitive sense unit centers is less than or equal to the transverse width W of magnet 5 and is no more than 2/3rds of minimum magnetic code spacing.
Concrete, the magnetic responsiveness of magnetosensitive sense unit is asymmetric or antisymmetry to magnetic direction, and the magnetosensitive sense unit that is arranged in magnet 5 center lines one side with in opposite side magnetosensitive sense unit same magnetic direction is had opposite or different responses.
The magnetic direction that each described magnetosensitive sense unit detects is identical or opposite along the direction that magnet 5 laterally moves with magnetic code.
Magnetosensitive sense unit is set to inductive coil, giant magnetoresistance, tunnel magnetoresistive or has different magnetoresistive film or the device of barber shop's formula conductive stripe.Need to prove that magnetosensitive sense unit is not limited to above-mentioned form, also can be fluxgate, superconduction heterojunction etc.
Wherein, there are difference or opposite response in 4 pairs of different directions magnetic fields of magnet-sensitive element, can be magnetic induction coil, giant magnetoresistance, tunnel magnetoresistive or different magnetoresistive film chip or the device that has barber shop's lamp formula bus.
Adopt above-mentioned Magnetic Sensor to quantize to identify magnetic code magnetic hysteresis loop feature, adopt following method to carry out: magnetic code is finished magnetic hysteresis loop process complete or part through Magnetic Sensor when surface by described magnet magnetization, and is identified by the signal that Magnetic Sensor reads corresponding magnetic history.
Evaluation comprises that the coercive force of definition magnetic code is identified, quantized to magnetic code soft or hard magnetic characteristic, quantification defines the square degree of magnetic code and quantizes the definition reversing magnetic field and distributes.
Wherein, magnetic code soft or hard magnetic characteristic identifies it is whether signal according to single magnetic code is that single monolateral peak judges whether magnetic code belongs to Hard Magnetic or soft magnetism.Crest quantity method specifically is to judge according to the shown signal peak quantity of each single magnetic code.Represent that when a monolateral signal peak only occurring magnetic code is can't be by the Hard Magnetic of magnet reverse magnetization direction, and the plus or minus of crest represents magnetic code direction of magnetization and the magnet-sensitive element of process at first, and to respond to the positive flux field direction opposite or identical; If a plurality of signal peaks occur, then be judged as coercive force less than the soft magnetism of magnetic field of magnets.
The coercive force that quantizes the definition magnetic code specifically is the wave amplitude ratio that calculates between the different crests of each single magnetic code signal of sensing magnetosensitive sense unit, weighs and quantizes to define the coercitive size of this magnetic code with this ratio.
When two crests occurring, the peak value at a back peak has reflected that divided by the resulting ratio of the peak value at previous peak the magnetic code forward rectifys stupid size.Ratio be 1 o'clock be zero corresponding to the magnetic code coercive force, ratio is 0 o'clock, have only a peak this moment, can't be reversed by magnetic field of magnets corresponding to the magnetic code coercive force.The corresponding wave amplitude ratio of marginal coercive force is between 1 and 0, and the more little then wave amplitude of coercive force ratio is more close to 1, and the more big then wave amplitude of coercive force ratio is more close to 0.
When three crests occurring simultaneously, the peak value at first peak has reflected the coercitive size of magnetic code negative sense divided by the resulting ratio of the peak value at second peak, and the more little then ratio of coercive force is more close to 0, and the more big then ratio of coercive force is more close to 1.The peak value at the 3rd peak has reflected that divided by the resulting ratio of the peak value at second peak the magnetic code forward rectifys stupid size, and the more little then wave amplitude of coercive force ratio is more close to 1, and the more big then wave amplitude of coercive force ratio is more close to 0.
Above-mentioned quantification definition magnetic code magnetic hysteresis loop square degree and reversing magnetic field distribution characteristics, specifically be the ratio that calculates between single each section of magnetic code signal waveform time width of sensing, and weigh and quantize to define square degree and the reversing magnetic field distribution of this magnetic code magnetic hysteresis loop with this ratio.
Wide ratioing technigue quantizes to identify square degree (Sq=Mr/Ms) and the reversing magnetic field distribution that represent the magnetic hysteresis loop feature when adopting the waveform of single magnetic code interval
Width was than still calculating according to the shown signal of each single magnetic code when waveform was interval.
When having only a signal peak, magnetic code is the Hard Magnetic that magnet can't reverse, and therefore fubaritic reversing magnetic field distributes; The available peak value falling 90% of its square degree and the difference of 100% time of peak value and recently weighing of peak width at half height time.
When two or three signal peaks occurring, the penult peak represented the size of square degree by peak value to the ratio of the difference that falls time of 90% after rise and half-peak breadth, the more big square degree of then representing of ratio is more big.And reversing magnetic field distribution SFD can with the penult peak by fall after rise 50% to make zero with mistiming and the ratio of its half-peak breadth represent, the more little SFD that then represents is more big for ratio.
Particularly, according to measured magnetic code signal, can obtain the formula of reduction of following quantification definition magnetic hysteresis loop feature.
Hc/Hm = 1-(V2/V1)^(1/n) …… (1)
SFD = 2(t0-t50)/tw …… (2)
SQ/SQ0 = （t90-t100/tw …… (3)
Wherein, V2 is the peak value at last peak; V2 is the peak value at last peak; V1 is the peak value at penult peak; The n index that to be magnetic code magnetic field decay with distance depends on and the sensitivity of magnet-sensitive element that n is between 1.0 and 3.5 usually, and the more big then n of sensitivity value is just more little; SQ0 is wave amplitude and the ratio of halfwidth time at 1 o'clock penult peak for the square degree; The peak value that t100, t90, t50 and t0 are respectively the penult peak is 100% and falls after rise time to 90%, 50% and zero time; Tw is the penult peak width time.
Authentication method provided by the utility model adopts the crest quantity method qualitative judgement magnetic code of same single magnetic code whether to belong to Hard Magnetic according to the signal that reads; Adopt the wave amplitude ratioing technigue quantification evaluation magnetic code coercive force of same magnetic code, wide ratioing technigue quantizes to identify square degree (Sq=Mr/Ms) and the reversing magnetic field distribution that represents the magnetic hysteresis loop feature during waveform interval of adopting single magnetic code
Do not rely on the absolute value of magnetic code magnetic field intensity signal, thereby insensitive to factors such as the detection spacing that influences signal intensity, bank note situation, bank note angle, temperature drift, magnet-sensitive element aberrations in property, guaranteed that false distinguishing judges the stability of parameter and the accuracy of judgement.
The utility model can be distinguished magnetic code and belong to soft magnetism or Hard Magnetic; Can quantize to define the magnetic hysteresis loop feature, comprise typical magnetic hysteresis loop characteristics such as coercive force, square degree and reversing magnetic field distribution; Its determination methods is at the magnetic hysteresis loop feature of each independent magnetic code itself, thus the power that does not rely on the magnetic code signal, can break away from magnetic field to greatest extent with the constraint of range attenuation.It is easy and simple to handle to have method, the accurate characteristics of result.A series of problems such as requiring minimum detection spacing, card paper money, roller fracture, bank note wearing and tearing, fold, angle and temperature drift have been solved.
Magnetic Sensor of the present utility model when magnetic code is finished magnetic hysteresis loop process complete or part through Magnetic Sensor when surface by magnet magnetization, and is read the signal of corresponding magnetic history and then is identified by Magnetic Sensor.By this Magnetic Sensor, can carry out the magnetic hysteresis loop feature to each magnetic code of currency and read, make that the currency false distinguishing is more accurate.
The Magnetic Sensor that the utility model provides, transverse width that can be by reducing magnet and normal pitch to be no more than minimum magnetic code spacing 2/3rds and avoid the stack of contiguous magnetic code signal effectively, thereby can analyze single magnetic code signal separately, bring convenience to qualification process.
Because above-mentioned beneficial effect, the utility model is identified precisely.Criterion can be implemented to quantize to whole magnetic codes in the bank note, counterfeit money can be effectively checked.
In addition, this magnetic sensor arrangement is simple, easy to use, not only is suitable for the currency authenticity, and the authenticity of other article such as suitable check.
A kind of Magnetic Sensor, other structures are with embodiment 1 identical difference: magnet-sensitive element is made of four magnetosensitive sense unit.Four magnetosensitive sense unit specifications are identical, and four magnetosensitive sense unit constitute the Hui Sitong half-bridge circuit; Four magnetosensitive sense unit are symmetrically distributed in the magnet centerline both sides along the magnetic induction direction, and the normal pitch between its magnetosensitive sense unit center is less than or equal to the transverse width W of magnet and is no more than 2/3rds of minimum magnetic code spacing.
By this Magnetic Sensor, can carry out the magnetic hysteresis loop feature to each magnetic code of currency and read, make that the currency false distinguishing is more accurate.
Adopt Magnetic Sensor of the present utility model, process is with the experience magnetic history above magnet with magnetic code, and the details of magnetic history as shown in Figure 4.Can the magnetization details depend on the soft or hard magnetic characteristic of magnetic code and be reversed by magnetic field of magnets.
The Hard Magnetic magnetic code that can not be inverted can only experience the magnetic hysteresis loop magnetic history of a part, the path 1 shown in Fig. 4 a or path 2.Hm is magnet maximum transversal magnetic field among Fig. 4 a, and path 1 is point from Mr+ to A, arrives Mr+ again, arrives the B point again, arrives Mr+ again.Path 2 is point from Mr-to C, arrives Mr-again, arrives the B point again, arrives Mr+ again.
The soft magnetism magnetic code that can be inverted, the direction of magnetization of the remanent magnetism when initial by magnetic code (Mr+ or Mr-) determines, the path 1 shown in Fig. 4 b or path 2.Among Fig. 4 b, path 1 is point from Mr+ to A, arrives Hc-again, arrives B point, C point, B point, Mr-, D point, Hc+, E point, F point, E point more successively, arrives Mr+ at last.
Fig. 5 has shown that Hard Magnetic magnetic code that a coercive force can't be overcome by magnet and coercive force are zero the soft magnetism magnetic code signal schematic representation during from left to right by the utility model embodiment one described Magnetic Sensor.
As can be seen from the figure, a monolateral crest has only appearred in the Hard Magnetic magnetic code, sense depends on whether the magnetic code remanence direction is identical identical at the next magnetic direction on direction of magnetic code with magnet, and wave amplitude ratio is 0, and peak width and wave amplitude ratio represent the slope of remanent magnetism part on the magnetic code magnetic hysteresis loop.
The soft magnetism magnetic code then demonstrates two crests, and wave amplitude ratio is 1.Thus, can adopt crest recently accurately express between zero and magnetic field of magnets between any coercive force.
One magnetic code is identified that resulting signal as shown in Figure 6 by Magnetic Sensor of the present utility model.
As can be seen from the figure, one of signal curve has two peaks, and one has three peaks, is soft magnetic code so can judge this magnetic code.Occur two peaks represent magnetic code remanent magnetism and magnet come to magnetic direction identical; Occur three peaks represent magnetic code remanent magnetism and magnet come to magnetic direction opposite.Reflect relevant coercitive size by corresponding wave amplitude ratio, according to formula (1), can draw the ^ (1/n) of coercivity H=1-(V2/V1).
Adopt Magnetic Sensor of the present utility model that magnetic code is identified, can identify the concrete feature of magnetic hysteresis loop, can improve false proof accuracy.
One magnetic code is identified that resulting signal as shown in Figure 7 by Magnetic Sensor of the present utility model.As can be seen from the figure, this magnetic code has two peaks and can judge and be soft magnetism.
Ratio by second peak value and first peak value can quantize to obtain coercive force.
The half-peak breadth that first peak is set is tw, and the summit time is t100, and peak value falling to 90% time is t90, and falling to 50% time is t50, and the time when falling is extremely zero is t0.
T90 in the difference of t100 time and the ratio of half-peak breadth tw, is obtained magnetic code square metric, and the more big expression square of ratio degree is more good;
With the difference of return-to-zero-time t0 and the half-peak breadth time t50 ratio to half-peak breadth, obtain reversing magnetic field distribution SFD, the more little SFD that then represents is more big for ratio.And SFD is the description at rollback point Hc place slope.Therefore, distance has represented SFD divided by the half-peak breadth sum between corresponding two peaks.
As seen, by Magnetic Sensor of the present utility model, can obtain the feature of the magnetic hysteresis loop of single magnetic code.Can quantitatively identify the magnetic code in the currency, improve false proof accuracy.
Embodiment 7.
One group of magnetic code obtains one group of magnetic code signal graph as shown in Figure 8 through Magnetic Sensor of the present utility model.Among the figure, magnetic code A and magnetic code B seem similar, and its signal is the strong magnetic code C that crosses also.
Form shown in Figure 9 has been listed signal shown in Figure 8 demonstrated with authentication method provided by the utility model and has been analyzed and provided qualification result.Draw magnetic code B and magnetic code A and different, and to seem small and weak magnetic code C be the judgement of Hard Magnetic in fact.This for traditional for Hall magnetic resistance magnetic code technology, be impossible mission.
Embodiment 8.
Adopt Magnetic Sensor of the present utility model and method that magnetic code is identified, as shown in figure 10, increase with detecting spacing, magnetic field of magnets weakens, and consequently signal weakens and the reducing of the relevant distance of reversing.Therefore, be necessary this is carried out on year-on-year basis or other power power correction.On year-on-year basis or other power power be modified to general knowledge known in this field, do not repeat them here.
Need to prove that the method for magnetic code magnetic hysteresis loop feature is identified in Magnetic Sensor of the present utility model and quantification, is not only applicable to the financial technology field, also go for other and need sign pseudo-field, as check, magnetic bar code and article anti-counterfeit sign etc.
Should be noted that at last; above embodiment only is used for the explanation the technical solution of the utility model but not to the restriction of the utility model protection domain; although with reference to preferred embodiment the utility model has been done detailed description; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement the technical solution of the utility model, and not break away from essence and the scope of technical solutions of the utility model.
Claims (7)
1. Magnetic Sensor is characterized in that: be provided with magnet and magnet-sensitive element, described magnet-sensitive element responds the magnetic field that described magnet produces; Magnetic code in the bank note is finished magnetic hysteresis loop process complete or part through Magnetic Sensor when surface by described magnet magnetization, and is identified by the signal that Magnetic Sensor reads corresponding magnetic history.
2. Magnetic Sensor according to claim 1, it is characterized in that: described magnet is set to strip, the transverse width W of described magnet is no more than 2/3rds of minimum magnetic code spacing, the south poles of described magnet is perpendicular to magnetic induction direction and the magnetic inductor plane of Magnetic Sensor, and transverse field strength can allow magnetic code experience part or all of magnetic hysteresis loop process when the horizontal process Magnetic Sensor of edge.
3. Magnetic Sensor according to claim 1 and 2, it is characterized in that: described magnet is set to permanent magnet, dc coil, AC coil or electromagnet.
4. Magnetic Sensor according to claim 2, it is characterized in that: described magnet-sensitive element is made up of two or four magnetosensitive sense unit, specification identical but response asymmetry in described magnetosensitive sense unit is in magnetic direction, when described magnet-sensitive element was two, two described magnet-sensitive elements constituted the Hui Sitong half-bridge circuit; When described magnet-sensitive element was set to four, four described magnetosensitive sense unit constituted the Hui Sitong full-bridge circuit;
Described favour stone half-bridge circuit or described favour stone full-bridge circuit are symmetrically distributed in described magnet centerline both sides along the magnetic induction direction, and transverse width W and described center distance that the center distance that constitutes the described magnetosensitive sense unit of described favour stone half-bridge circuit or described favour stone full-bridge is less than or equal to described magnet are no more than 2/3rds of minimum magnetic code spacing.
5. Magnetic Sensor according to claim 4, it is characterized in that: the magnetic responsiveness of described magnetosensitive sense unit is asymmetric or antisymmetry to magnetic direction, and the magnetosensitive sense unit that is arranged in magnet centerline one side with in opposite side magnetosensitive sense unit same magnetic direction is had opposite or different responses.
6. Magnetic Sensor according to claim 4 is characterized in that: laterally mobile direction is identical or opposite along magnet for the magnetic direction that each described magnetosensitive sense unit detects and magnetic code.
7. Magnetic Sensor according to claim 5, it is characterized in that: described magnetosensitive sense unit is set to inductive coil, giant magnetoresistance, tunnel magnetoresistive, has different magnetoresistive film or device, fluxgate or the superconduction heterojunction of barber shop's formula conductive stripe.
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| CN2013200352567U CN203118094U (en) | 2013-01-23 | 2013-01-23 | Magnetic sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103106727A (en) * | 2013-01-23 | 2013-05-15 | 广州纳龙智能科技有限公司 | Magnetic sensor and method of quantitatively identify characteristics of magnetic code hysteresis circuit line |
| CN106537166A (en) * | 2014-07-25 | 2017-03-22 | 三菱电机株式会社 | Magnetic sensor device |
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2013
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103106727A (en) * | 2013-01-23 | 2013-05-15 | 广州纳龙智能科技有限公司 | Magnetic sensor and method of quantitatively identify characteristics of magnetic code hysteresis circuit line |
| CN103106727B (en) * | 2013-01-23 | 2014-04-09 | 广州纳龙智能科技有限公司 | Magnetic sensor and method of quantitatively identify characteristics of magnetic code hysteresis circuit line |
| WO2014114037A1 (en) * | 2013-01-23 | 2014-07-31 | 广州纳龙智能科技有限公司 | Magnetic sensor and method for quantifying and authenticating magnetic hysteresis loop feature of magnetic code |
| CN106537166A (en) * | 2014-07-25 | 2017-03-22 | 三菱电机株式会社 | Magnetic sensor device |
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