CN103268658A - Magnetic moment orientation device for identifying magnetic graph on magnetic stripe and identification method of magnetic moment orientation device - Google Patents
Magnetic moment orientation device for identifying magnetic graph on magnetic stripe and identification method of magnetic moment orientation device Download PDFInfo
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- CN103268658A CN103268658A CN2013101318341A CN201310131834A CN103268658A CN 103268658 A CN103268658 A CN 103268658A CN 2013101318341 A CN2013101318341 A CN 2013101318341A CN 201310131834 A CN201310131834 A CN 201310131834A CN 103268658 A CN103268658 A CN 103268658A
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Abstract
The invention discloses a magnetic moment orientation device for identifying a magnetic graph on a magnetic stripe. The device comprises a permanent magnet, an L-shaped soft magnet and a magnetoresistance chip. The soft magnet comprises a bottom part and a side wall; the permanent magnet is arranged at the bottom of the soft magnet; one side face of the soft magnet is opposite to the side wall of the soft magnet; a slit is formed between the side face of the soft magnet and the side wall of the soft magnet; the magnetoresistance chip is arranged at the outer side of the side wall of the soft magnet; the direction of the magnetization intensity of the permanent magnet is vertical to the bottom part of the soft magnet; and the direction of a magnetic field formed above the slit by the permanent magnet and the soft magnet is parallel with the upper end face of the permanent magnet and the upper end of the soft magnet. According to the magnetic moment orientation device for identifying the magnetic graph on the magnetic stripe, the authenticity of paper money can be identified by detecting the magnetic moment orientation of a magnetic dielectric material in the magnetic graph on the magnetic stripe of the paper money.
Description
Technical field
The present invention relates to a kind of magnetic moment orientation device and recognition methods thereof of identifying magnetic pattern thereon on the magnetic stripe.
Background technology
Usually, bank note for example includes magnetic stripe in the Renminbi, has magnetic pattern thereon on the magnetic stripe, and magnetic pattern thereon contains magnetic media material.The magnetic that adopts Renminbi truth identification instrument to detect magnetic media material in the Renminbi can be identified the true and false of Renminbi.In the prior art, Renminbi truth identification instrument has, does not have a judgment basis as the Renminbi true and false with magnetic medium magnetism of material in the Renminbi, perhaps with strong, the weak judgment basis as the Renminbi true and false of magnetic of magnetic medium material in the Renminbi.
When using Renminbi truth identification instrument to differentiate the true and false of Renminbi, be arranged at the permanent magnet generation of Renminbi truth identification instrument inside perpendicular to the magnetic field on plane, bank note place, this magnetic field can make the magnetic medium material magnetization in the Renminbi, the new magnetic field of magnetic medium material production after being magnetized.The true and false of Renminbi can be identified in the magnetic field of the magnetic medium material production after being magnetized by detection.
In the prior art, the magneto sensor that is used for Renminbi truth identification instrument mainly contains Hall element, giant magnetoresistance (GMR) element and tunnel magneto resistance (TMR) element.Hall element for example tellurium indium (InSb) Hall element for detection of the magnetic-field component perpendicular to Renminbi place in-plane of magnetic medium material production in the Renminbi.GMR element and TMR element are for detection of the magnetic-field component that is parallel to Renminbi place in-plane of magnetic medium material production in the Renminbi.During use, above-mentioned magneto sensor for Renminbi truth identification instrument is with the magnetized magnetic field of detecting the magnetic medium material production simultaneously of the magnetic medium material of Renminbi.Therefore, the magnetic moment orientation of magnetic medium material is identical with the magnetic direction that the permanent magnet of Renminbi truth identification instrument inside produces.In this case, Renminbi truth identification instrument can only detect magnetic medium material in the Renminbi magnetic have or not and strong and weak, can not detect the magnetic moment orientation of magnetic medium material in the Renminbi, thus can not be with the magnetic moment orientation of magnetic medium material in the Renminbi judgment basis as the Renminbi true and false.Therefore, the Renminbi truth identification instrument of prior art is lower to the recognition capability of the Renminbi true and false, and has limited the raising of Renminbi anti-counterfeit capability.
At present, be starved of a kind of magnetic moment orientation device and recognition methods thereof of identifying magnetic pattern thereon on the magnetic stripe, this device can not only detect having or not of magnetic medium magnetism of material in the Renminbi and strong and weak, and can detect the magnetic moment orientation of magnetic medium material in the Renminbi, recognition capability to the Renminbi true and false is higher, is conducive to improve the anti-counterfeit capability of Renminbi.
Summary of the invention
The purpose of this invention is to provide a kind of magnetic moment orientation device and recognition methods thereof of identifying magnetic pattern thereon on the magnetic stripe.
The magnetic moment orientation device of magnetic pattern thereon comprises permanent magnet, L shaped soft magnetic bodies and magneto-resistor chip on the identification magnetic stripe provided by the invention; Described soft magnetic bodies comprises bottom and sidewall, and described permanent magnet is located on the bottom of described soft magnetic bodies, and a side of described permanent magnet and the sidewall of described soft magnetic bodies and form slit between the sidewall of the side of described permanent magnet and described soft magnetic bodies in opposite directions; Described magneto-resistor chip is located at the sidewall outside of described soft magnetic bodies, the direction of the magnetization of described permanent magnet is perpendicular to the bottom of described soft magnetic bodies, and the direction in the magnetic field that described permanent magnet and described soft magnetic bodies form above described slit is parallel to the upper surface of described permanent magnet and the upper surface of described soft magnetic bodies; Described magneto-resistor chip adopts half-bridge or full-bridge, and the sensitive direction of each brachium pontis of this half-bridge or full-bridge is identical, and each brachium pontis of this half-bridge or full-bridge comprises at least one magnetoresistive element.
Preferably, described permanent magnet is cuboid.
Preferably, the sidewall of described soft magnetic bodies is cuboid.
Preferably, be provided with first inclined-plane between the side of described permanent magnet and its upper surface.
Preferably, be provided with second inclined-plane between the medial surface of the sidewall of described soft magnetic bodies and its upper surface.
Preferably, each brachium pontis of the half-bridge of described magneto-resistor chip or full-bridge comprises a plurality of series connection and/or magnetoresistive element in parallel.
Preferably, described magnetoresistive element is GMR element or TMR element.
Preferably, the material of described permanent magnet is neodymium iron boron, SmCo or hard ferrite.
Preferably, the material of described soft magnetic bodies is siliconized plate, permalloy or soft magnetic ferrite.
On the described identification magnetic stripe of application provided by the invention on the magnetic moment orientation device of the magnetic pattern thereon identification magnetic stripe magnetic moment orientation method of magnetic pattern thereon comprise the steps:
Magnetic pattern thereon on the magnetic stripe is placed the magnetic moment orientation device top of magnetic pattern thereon on the identification magnetic stripe, and magnetic pattern thereon is moved to the magneto-resistor chip by permanent magnet along being parallel to permanent magnet upper surface direction;
In the time of directly over magnetic pattern thereon on the magnetic stripe moves to permanent magnet, the magnetic field that permanent magnet and soft magnetic bodies form reaches peak value along the component perpendicular to permanent magnet upper surface direction, magnetic media material on the magnetic stripe in the magnetic pattern thereon is once magnetized along the component perpendicular to permanent magnet upper surface direction by the magnetic field that permanent magnet and soft magnetic bodies form, by the magnetic moment orientation of the whole magnetic media material in the magnetic pattern thereon on the magnetic stripe after once magnetizing along perpendicular to permanent magnet upper surface direction;
When magnetic pattern thereon on the magnetic stripe move to slit directly over the time, the magnetic field that permanent magnet and soft magnetic bodies form reaches peak value along the component that is parallel to permanent magnet upper surface direction, easy axis on the magnetic stripe in the magnetic pattern thereon is magnetized along the component secondary that is parallel to permanent magnet upper surface direction by the magnetic field of permanent magnet and soft magnetic bodies formation along the magnetic media material that is parallel to permanent magnet upper surface direction, on the magnetic stripe after being magnetized by secondary in the magnetic pattern thereon easy axis along the magnetic moment orientation of the magnetic media material that is parallel to permanent magnet upper surface direction along being parallel to permanent magnet upper surface direction, and on the magnetic stripe after being magnetized by secondary in the magnetic pattern thereon easy axis along perpendicular to the magnetic moment orientation of the magnetic media material of permanent magnet upper surface direction still along perpendicular to permanent magnet upper surface direction;
When magnetic pattern thereon on the magnetic stripe moves to magneto-resistor chip top, the distribution of the magnetic induction density that easy axis produces above the magneto-resistor chip along the magnetic media material that is parallel and perpendicular to permanent magnet upper surface direction respectively in the magnetic pattern thereon on the magnetic stripe has tangible distinguishing characteristics, and the magneto-resistor chip can be distinguished the magnetic moment orientation of the magnetic media material that easy axis is different in the magnetic pattern thereon on the magnetic stripe by the distribution that detects the magnetic induction density that magnetic media material produces in the magnetic pattern thereon on the magnetic stripe above the magnetic resistance chip.
The present invention has following beneficial effect:
(1) the magnetic moment orientation device of magnetic pattern thereon can not only detect on the magnetic stripe having or not of magnetic medium magnetism of material in the magnetic pattern thereon and strong and weak on the described identification magnetic stripe, and can detect on the magnetic stripe magnetic moment orientation of magnetic medium material in the magnetic pattern thereon, thereby can identify the true and false of bank note by the magnetic moment orientation of magnetic medium material in the magnetic pattern thereon on the detection bank note magnetic stripe, recognition capability to forge or true or paper money is higher, and is conducive to improve the anti-counterfeit capability of bank note;
(2) the magneto-resistor chip of the magnetic moment orientation device of magnetic pattern thereon adopts full-bridge on the described identification magnetic stripe, therefore has the ability of very strong inhibition common mode magnetic interference.
Description of drawings
The magnetic moment orientation schematic representation of apparatus of magnetic pattern thereon on the identification magnetic stripe that Fig. 1 provides for the embodiment of the invention 1;
The sectional view of the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe that Fig. 2 provides for the embodiment of the invention 1;
The structural representation of the half-bridge of the magneto-resistor chip of the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe that Fig. 3 provides for the embodiment of the invention 1;
The equivalent circuit diagram of the half-bridge of the magneto-resistor chip of the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe that Fig. 4 provides for the embodiment of the invention 1;
The magnetic field profile synoptic diagram of the magnetic moment orientation device of magnetic pattern thereon top on the identification magnetic stripe that Fig. 5 provides for the embodiment of the invention 1;
Fig. 6 is by the curve map of the magnetic induction density B of the magnetic media material in the magnetic pattern thereon on the magnetic stripe after once magnetizing with the change in location of X-direction;
Fig. 7 is the magnetic induction density B of the magnetic media material in the magnetic pattern thereon on the magnetic stripe after being magnetized by the secondary curve map with the change in location of X-direction;
The magnetic moment orientation schematic representation of apparatus of magnetic pattern thereon on the identification magnetic stripe that Fig. 8 provides for the embodiment of the invention 2;
The sectional view of the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe that Fig. 9 provides for the embodiment of the invention 2;
The structural representation of the full-bridge of the magneto-resistor chip of the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe that Figure 10 provides for the embodiment of the invention 2;
The equivalent circuit diagram of the full-bridge of the magneto-resistor chip of the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe that Figure 11 provides for the embodiment of the invention 2;
The magnetic field profile synoptic diagram of the magnetic moment orientation device of magnetic pattern thereon top on the identification magnetic stripe that Figure 12 provides for the embodiment of the invention 2.
Embodiment
Below in conjunction with drawings and Examples content of the present invention is further described.
Embodiment 1
The magnetic moment orientation device of magnetic pattern thereon comprises permanent magnet 1, L shaped soft magnetic bodies 2 and magneto-resistor chip 3 on the identification magnetic stripe that present embodiment provides, as depicted in figs. 1 and 2.Soft magnetic bodies 2 comprises bottom 21 and sidewall 22.In the present embodiment, the sidewall 22 of permanent magnet 1 and soft magnetic bodies 2 all is for example cuboid.Permanent magnet 1 is located on the bottom 21 of soft magnetic bodies 2.The side 11 of permanent magnet 1 and the sidewall 22 of soft magnetic bodies 2 in opposite directions, and formation slit 4 between the sidewall 22 of the side 11 of permanent magnet 1 and soft magnetic bodies 2.Magneto-resistor chip 3 is located at the outside of the sidewall 22 of soft magnetic bodies 2.The direction 5 of the magnetization of permanent magnet 1 is perpendicular to the bottom 21 of soft magnetic bodies 2, and namely the direction 5 of the magnetization of permanent magnet 1 is parallel to Z-direction.As shown in Figure 2, the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form constitutes the magnetic circuit loop of a closure, and the direction 6 in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form above slit 4 is parallel to the upper surface 12 of permanent magnet 1 and the upper surface 23 of soft magnetic bodies 2, and namely the direction 6 in the magnetic field that forms above slit 4 of permanent magnet 1 and soft magnetic bodies 2 is parallel to X-direction.The material of permanent magnet 1 is neodymium iron boron, SmCo or hard ferrite.The material of soft magnetic bodies 2 is siliconized plate, permalloy or soft magnetic ferrite.
Magneto-resistor chip 3 adopts the circuit structure of half-bridge or full-bridge.In the present embodiment, magneto-resistor chip 3 adopts for example half-bridge 31.As shown in Figure 3 and Figure 4, half-bridge 31 comprises two brachium pontis that sensitive direction is identical, i.e. first brachium pontis 311 and second brachium pontis 312.Each brachium pontis of half-bridge 31 comprises at least one magnetoresistive element.When each brachium pontis of half-bridge 31 comprises a plurality of magnetoresistive element, these a plurality of magnetoresistive element series connection and/or in parallel.Magnetoresistive element is GMR element or TMR element.In the present embodiment, each brachium pontis of half-bridge 31 comprises for example three GMR elements of series connection.The sensitive direction of first brachium pontis 311 and second brachium pontis 312 is all along sensitive direction 7, as shown in Figure 3.The magnetic field that magnetic media material on the magnetic stripe in the magnetic pattern thereon produces is H along the component of Z-direction
z, and this magnetic-field component H
zSize change in gradient.As shown in Figure 3, the magnetic-field component H at first brachium pontis 311 and second brachium pontis, 312 positions place
zVary in size.In the present embodiment, when magnetic pattern thereon on the magnetic stripe is positioned at magneto-resistor chip 3 tops, the magnetic-field component H at place, first brachium pontis, 311 positions
zMagnetic-field component H greater than place, second brachium pontis, 312 positions
zTwo input ends of half-bridge 31 are In1 and In2, input end In2 ground connection wherein, as shown in Figure 4.The output terminal of half-bridge 31 is Out.When applying steady voltage between input end In1 and input end In2, the resistance change of first brachium pontis 311 and second brachium pontis 312 varies in size, so output terminal Out is with output voltage signal.
Fig. 5 is the magnetic field profile synoptic diagram of the magnetic moment orientation device top of magnetic pattern thereon on the identification magnetic stripe of present embodiment.The component H of the Z-direction in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form
zWith the curve of the change in location of X-direction shown in the solid line among Fig. 5.Position directly over the permanent magnet 1, the component H of the Z-direction in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form
zReach peak value.The component H of the X-direction in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form
xWith the curve of the change in location of X-direction shown in the dotted line among Fig. 5.Position directly over slit 4, the component H of the X-direction in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form
xReach peak value.
The method of using magnetic pattern thereon magnetic moment orientation on the magnetic moment orientation device identification magnetic stripe of magnetic pattern thereon on the identification magnetic stripe of present embodiment is as follows:
Magnetic pattern thereon on the magnetic stripe is placed the magnetic moment orientation device top of magnetic pattern thereon on the identification magnetic stripe, and make that magnetic pattern thereon is that X-direction is moved to magneto-resistor chip 3 by permanent magnet 1 along being parallel to permanent magnet 1 upper surface 12 directions on the magnetic stripe;
In the time of directly over magnetic pattern thereon on the magnetic stripe moves to permanent magnet 1, the edge, magnetic field that permanent magnet 1 and soft magnetic bodies 2 form is the component H of Z-direction perpendicular to permanent magnet 1 upper surface 12 directions
zReach peak value, the magnetic media material on the magnetic stripe in the magnetic pattern thereon is the component H of Z-direction by the edge, magnetic field of permanent magnet 1 and soft magnetic bodies 2 formation perpendicular to permanent magnet 1 upper surface 12 directions
zOnce magnetization, by the magnetic moment orientation of the whole magnetic media material in the magnetic pattern thereon on the magnetic stripe after once magnetizing along being Z-direction perpendicular to permanent magnet 1 upper surface 12 directions, by the magnetic induction density B that the position produces under it of the magnetic media material in the magnetic pattern thereon on the magnetic stripe after once magnetizing with the curve of the change in location of X-direction as shown in Figure 6;
When magnetic pattern thereon on the magnetic stripe move to slit 4 directly over the time, the magnetic field that permanent magnet 1 and soft magnetic bodies 2 forms is the component H of X-direction along being parallel to permanent magnet 1 upper surface 12 directions
xReach peak value, part dielectric material on the magnetic stripe in the magnetic pattern thereon, namely easy axis is that the magnetic media material of X-direction is the component H of X-direction by the magnetic field that permanent magnet 1 and soft magnetic bodies 2 forms along being parallel to permanent magnet 1 upper surface 12 directions along being parallel to permanent magnet 1 upper surface 12 directions
xThe secondary magnetization, on the magnetic stripe after being magnetized by secondary in the magnetic pattern thereon easy axis be that the magnetic moment orientation of the magnetic media material of X-direction is X-direction along being parallel to permanent magnet 1 upper surface 12 directions along being parallel to permanent magnet 1 upper surface 12 directions, and on the magnetic stripe after being magnetized by secondary in the magnetic pattern thereon easy axis along perpendicular to permanent magnet 1 upper surface 12 directions be the magnetic moment orientation of magnetic media material of Z-direction still along being Z-direction perpendicular to permanent magnet 1 upper surface 12 directions, the magnetic induction density B that the position produces under it of the magnetic media material on the magnetic stripe after being magnetized by secondary in the magnetic pattern thereon is with the curve of the change in location of X-direction as shown in Figure 7;
When magnetic pattern thereon on the magnetic stripe moves to magneto-resistor chip 3 tops, by Fig. 6 and Fig. 7 as can be seen, on the magnetic stripe in the magnetic pattern thereon easy axis respectively along to be parallel to permanent magnet 1 upper surface 12 directions be X-direction and have tangible distinguishing characteristics along the distribution that perpendicular to permanent magnet 1 upper surface 12 directions is the magnetic induction density B that produces of the magnetic media material of Z-direction above magneto-resistor chip 3, therefore, magneto-resistor chip 3 can be distinguished the magnetic moment orientation of the magnetic media material that easy axis is different in the magnetic pattern thereon on the magnetic stripe by the distribution that detects the magnetic induction density B that magnetic media material produces in the magnetic pattern thereon on the magnetic stripe above magnetic resistance chip 3.
The magnetic moment orientation device of magnetic pattern thereon comprises permanent magnet 1, L shaped soft magnetic bodies 2 and magneto-resistor chip 3 on the identification magnetic stripe that present embodiment provides, as Fig. 8 and shown in Figure 9.Soft magnetic bodies 2 comprises bottom 21 and sidewall 22.Permanent magnet 1 is located on the bottom 21 of soft magnetic bodies 2.The side 11 of permanent magnet 1 and the sidewall 22 of soft magnetic bodies 2 in opposite directions, and formation slit 4 between the sidewall 22 of the side 11 of permanent magnet 1 and soft magnetic bodies 2.In the present embodiment, be provided with first inclined-plane 13 between the side 11 of permanent magnet 1 and its upper surface 12, and be provided with second inclined-plane 24 between the medial surface 25 of the sidewall 22 of soft magnetic bodies 2 and its upper surface 23.First inclined-plane 13 and second inclined-plane 24 are inverted " eight " font.Magneto-resistor chip 3 is located at the outside of the sidewall 22 of soft magnetic bodies 2.The direction 5 of the magnetization of permanent magnet 1 is perpendicular to the bottom 21 of soft magnetic bodies 2, and namely the direction 5 of the magnetization of permanent magnet 1 is parallel to Z-direction.As shown in Figure 9, the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form constitutes the magnetic circuit loop of a closure, and the direction 6 in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form above slit 4 is parallel to the upper surface 12 of permanent magnet 1 and the upper surface 23 of soft magnetic bodies 2, and namely the direction 6 in the magnetic field that forms above slit 4 of permanent magnet 1 and soft magnetic bodies 2 is parallel to X-direction.The material of permanent magnet 1 is neodymium iron boron, SmCo or hard ferrite.The material of soft magnetic bodies 2 is siliconized plate, permalloy or soft magnetic ferrite.
Magneto-resistor chip 3 adopts the circuit structure of half-bridge or full-bridge.In the present embodiment, magneto-resistor chip 3 adopts for example full-bridge 32.As shown in Figure 10 and Figure 11, full-bridge 32 comprises four brachium pontis that sensitive direction is identical, i.e. first brachium pontis 321, second brachium pontis 322, the 3rd brachium pontis 323 and the 4th brachium pontis 324.Each brachium pontis of full-bridge 32 comprises at least one magnetoresistive element.When each brachium pontis of full-bridge 32 comprises a plurality of magnetoresistive element, these a plurality of magnetoresistive element series connection and/or in parallel.Magnetoresistive element is GMR element or TMR element.In the present embodiment, each brachium pontis of full-bridge 32 comprises five TMR elements for example in parallel.The sensitive direction of first brachium pontis 321, second brachium pontis 322, the 3rd brachium pontis 323 and the 4th brachium pontis 324 is all along sensitive direction 7.The magnetic field that magnetic media material on the magnetic stripe in the magnetic pattern thereon produces is H along the component of Z-direction
z, and this magnetic-field component H
zSize change in gradient.As shown in figure 10, the magnetic-field component H at first brachium pontis 321 and second brachium pontis, 322 positions place
zSize and the magnetic-field component H at the 3rd brachium pontis 323 and the 4th brachium pontis 324 positions place
zVary in size.In the present embodiment, when magnetic pattern thereon on the magnetic stripe is positioned at magneto-resistor chip 3 tops, the magnetic-field component H at first brachium pontis 321 and place, second brachium pontis, 322 positions
zMagnetic-field component H greater than the 3rd brachium pontis 323 and place, the 4th brachium pontis 324 positions
zTwo input ends of full-bridge 32 are In1 and In2, input end In2 ground connection wherein, as shown in figure 11.The output terminal of full-bridge 32 is Out1 and Out2.When between input end In1 and input end In2, applying steady voltage, the resistance change of first brachium pontis 321 or second brachium pontis 322 size varies in size with the resistance change of the 3rd brachium pontis 323 or the 4th brachium pontis 324, thus between output terminal Out1 and the Out2 with output voltage signal.
Under the effect in common mode magnetic field, the resistance change of each brachium pontis of full-bridge 32 is identical, and full-bridge 32 is output voltage signal not.Therefore, full-bridge 32 has the ability of very strong inhibition common mode magnetic interference, thereby makes the magnetic moment orientation device of identifying magnetic pattern thereon on the magnetic stripe have the ability of very strong inhibition common mode magnetic interference.
Figure 12 is the magnetic field profile synoptic diagram of the magnetic moment orientation device top of magnetic pattern thereon on the identification magnetic stripe of present embodiment.The component H of the Z-direction in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form
zWith the curve of the change in location of X-direction shown in the solid line among Figure 12.Position directly over permanent magnet 1, the component H of the Z-direction in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form
zReach peak value.The component H of the X-direction in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form
xWith the curve of the change in location of X-direction shown in the dotted line among Figure 12.Position directly over slit 4, the component H of the X-direction in the magnetic field that permanent magnet 1 and soft magnetic bodies 2 form
xReach peak value.
The magnetic moment orientation device of magnetic pattern thereon can not only detect on the magnetic stripe having or not of magnetic medium magnetism of material in the magnetic pattern thereon and strong and weak on the described identification magnetic stripe, and can detect on the magnetic stripe magnetic moment orientation of magnetic medium material in the magnetic pattern thereon, thereby can identify the true and false of bank note by the magnetic moment orientation of magnetic medium material in the magnetic pattern thereon on the detection magnetic stripe, recognition capability to forge or true or paper money is higher, and is conducive to improve the anti-counterfeit capability of bank note; The magneto-resistor chip of the magnetic moment orientation device of magnetic pattern thereon adopts full-bridge on the described identification magnetic stripe, therefore has the ability of very strong inhibition common mode magnetic interference.
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art is reading on the basis of instructions of the present invention and can make amendment to the technical scheme that each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe is characterized in that, this device comprises permanent magnet (1), L shaped soft magnetic bodies (2) and magneto-resistor chip (3);
Described soft magnetic bodies (2) comprises bottom (21) and sidewall (22), described permanent magnet (1) is located on the bottom (21) of described soft magnetic bodies (2), a side (11) of described permanent magnet (1) and the sidewall (22) of described soft magnetic bodies (2) and form slit (4) between the sidewall (22) of the side (11) of described permanent magnet (1) and described soft magnetic bodies (2) in opposite directions;
Described magneto-resistor chip (3) is located at sidewall (22) outside of described soft magnetic bodies (2), the direction (5) of the magnetization of described permanent magnet (1) is perpendicular to the bottom (21) of described soft magnetic bodies (2), and described permanent magnet (1) and described soft magnetic bodies (2) are parallel to the upper surface (12) of described permanent magnet (1) and the upper surface (23) of described soft magnetic bodies (2) in the direction (6) in the magnetic field that described slit (4) top forms;
Described magneto-resistor chip (3) adopts half-bridge or full-bridge, and the sensitive direction of each brachium pontis of this half-bridge or full-bridge is identical, and each brachium pontis of this half-bridge or full-bridge comprises at least one magnetoresistive element.
2. the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe according to claim 1 is characterized in that described permanent magnet (1) is cuboid.
3. the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe according to claim 1 and 2 is characterized in that, the sidewall (22) of described soft magnetic bodies (2) is cuboid.
4. the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe according to claim 1 is characterized in that, is provided with first inclined-plane (13) between the side (11) of described permanent magnet (1) and its upper surface (12).
5. according to the magnetic moment orientation device of magnetic pattern thereon on claim 1 or the 4 described identification magnetic stripes, it is characterized in that, be provided with second inclined-plane (24) between the medial surface (25) of the sidewall (22) of described soft magnetic bodies (2) and its upper surface (23).
6. the magnetic moment orientation device of magnetic pattern thereon on the identification magnetic stripe according to claim 1 is characterized in that, the half-bridge of described magneto-resistor chip (3) or each brachium pontis of full-bridge comprise a plurality of series connection and/or magnetoresistive element in parallel.
7. according to the magnetic moment orientation device of magnetic pattern thereon on claim 1 or the 6 described identification magnetic stripes, it is characterized in that described magnetoresistive element is GMR element or TMR element.
8. according to the magnetic moment orientation device of magnetic pattern thereon on claim 1, the 2 or 4 described identification magnetic stripes, it is characterized in that the material of described permanent magnet (1) is neodymium iron boron, SmCo or hard ferrite.
9. according to the magnetic moment orientation device of magnetic pattern thereon on claim 1 or the 3 described identification magnetic stripes, it is characterized in that the material of described soft magnetic bodies (2) is siliconized plate, permalloy or soft magnetic ferrite.
10. the magnetic moment orientation device of using magnetic pattern thereon on the above-mentioned identification magnetic stripe is identified the method for the magnetic moment orientation of magnetic pattern thereon on the magnetic stripe, it is characterized in that this method comprises the steps:
Magnetic pattern thereon on the magnetic stripe is placed the magnetic moment orientation device top of magnetic pattern thereon on the identification magnetic stripe, and magnetic pattern thereon is moved to magneto-resistor chip (3) by permanent magnet (1) along being parallel to permanent magnet (1) upper surface (12) direction;
In the time of directly over magnetic pattern thereon on the magnetic stripe moves to permanent magnet (1), the magnetic field that permanent magnet (1) and soft magnetic bodies (2) form reaches peak value along the component perpendicular to permanent magnet (1) upper surface (12) direction, magnetic media material on the magnetic stripe in the magnetic pattern thereon is once magnetized along the component perpendicular to permanent magnet (1) upper surface (12) direction by the magnetic field that permanent magnet (1) and soft magnetic bodies (2) form, by the magnetic moment orientation of the whole magnetic media material in the magnetic pattern thereon on the magnetic stripe after once magnetizing along perpendicular to permanent magnet (1) upper surface (12) direction;
When magnetic pattern thereon on the magnetic stripe move to slit (4) directly over the time, the magnetic field that permanent magnet (1) and soft magnetic bodies (2) form reaches peak value along the component that is parallel to permanent magnet (1) upper surface (12) direction, easy axis on the magnetic stripe in the magnetic pattern thereon is magnetized along the component secondary that is parallel to permanent magnet (1) upper surface (12) direction by the magnetic field of permanent magnet (1) and soft magnetic bodies (2) formation along the magnetic media material that is parallel to permanent magnet (1) upper surface (12) direction, on the magnetic stripe after being magnetized by secondary in the magnetic pattern thereon easy axis along the magnetic moment orientation of the magnetic media material that is parallel to permanent magnet (1) upper surface (12) direction along being parallel to permanent magnet (1) upper surface (12) direction, and on the magnetic stripe after being magnetized by secondary in the magnetic pattern thereon easy axis along perpendicular to the magnetic moment orientation of the magnetic media material of permanent magnet (1) upper surface (12) direction still along perpendicular to permanent magnet (1) upper surface (12) direction;
When magnetic pattern thereon on the magnetic stripe moves to magneto-resistor chip (3) top, the distribution of the magnetic induction density that easy axis produces in magneto-resistor chip (3) top along the magnetic media material that is parallel and perpendicular to permanent magnet (1) upper surface (12) direction respectively in the magnetic pattern thereon on the magnetic stripe has tangible distinguishing characteristics, and magneto-resistor chip (3) can be distinguished the magnetic moment orientation of the magnetic media material that easy axis is different in the magnetic pattern thereon on the magnetic stripe by detecting on the magnetic stripe magnetic media material in the magnetic pattern thereon in the distribution of the magnetic induction density of magnetic resistance chip (3) top generation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569869A (en) * | 2013-10-21 | 2015-04-29 | 北京嘉岳同乐极电子有限公司 | Magnetic sensor |
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| CN108885808A (en) * | 2016-04-05 | 2018-11-23 | 株式会社维纳科斯 | Magnetic line sensor and the identification device for using the magnetic line sensor |
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