CN101167106B - Magnetic sensor and paper sheet identification device - Google Patents
Magnetic sensor and paper sheet identification device Download PDFInfo
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- CN101167106B CN101167106B CN200680014683XA CN200680014683A CN101167106B CN 101167106 B CN101167106 B CN 101167106B CN 200680014683X A CN200680014683X A CN 200680014683XA CN 200680014683 A CN200680014683 A CN 200680014683A CN 101167106 B CN101167106 B CN 101167106B
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
A magnetic sensor (10) comprises a core body (11) having a sensor face (110) whereupon an air gap (16) is opened, and an exciting coil (12) arranged in the air gap (16). A nonmagnetic wear resistant member (18) exhibiting conductivity is arranged in the air gap (16) on the side closer to the sensor face (110) than the exciting coil (12). A sheet identifying device (1), which is provided with the magnetic sensor (10) arranged on a conveyance passage (3) for the sheet (2) and identifies the sheet (2) being conveyed on the conveyance passage (3) based on the detection results from the magnetic sensor (10), comprises a core body (11) equipped with a magneto-sensitive portion (118) directed toward the conveyance passage (3), and an exciting coil (12) wound around the core body (11) in order todetect a pattern for generating a magnetic field in the conveyance passage (3) when an AC current is supplied. The magnetic sensor detects a first pattern (21) formed on the sheet (2) by a magnetic material and a second pattern (22) formed on the sheet (2) by a nonmagnetic material based on the detection results of magnetic field variation caused when the sheet (2) is conveyed on the conveyance passage (3).
Description
Technical field
The present invention relates to discern the Magnetic Sensor and the device for identifying sheet of the usefulness such as true and false and kind of scraps of paper classes such as bank note, check and other securities.
Background technology
In the past, the method that adopts in the recognition device of bank note etc. was, utilized MR sensor (magnetoresistive transducer) etc. to detect on the bank note with the figure of magnetic ink printing, discerned the true and false and kind (for example, with reference to patent documentation 1, patent documentation 2) of bank note.
In addition, when discerning bank note with no matter any method of these methods, if on the sensor cover opening is arranged, the problem that all exists bank note to block then.Therefore, adopt measures (for example, with reference to patent documentation 3) such as between sensor cover and bank note, disposing wearing plate.
Patent documentation 1: the spy opens the 2001-92915 communique
Patent documentation 2: the spy opens the 2003-35701 communique
Patent documentation 3: the spy opens the 2003-177169 communique
Summary of the invention
But, if between sensor cover and bank note, dispose wearing plate, then between sensor cover and bank note, producing big gap, sensitivity will reduce.Particularly along with the raising of printing technology towards the printed pattern densification with when adopting deep or light color direction to develop, require higher sensitivity, but the problem that exists is, can not adapt to such requirement with technology in the past.
In addition, raising along with printing technology, owing to occur only utilizing the MR sensor to be identified as genuine note but the tendency of counterfeit money, therefore adopt the bank note that forms hologram on the bank note, but, therefore can not detect with the MR sensor because such hologram forms with nonmagnetic materials such as aluminium.
So, consider to adopt the method that optical sensor is installed on recognition device, but when on a recognition device, Magnetic Sensor and optical sensor being installed, because that device constitutes is complicated, therefore the problem that exists is, and device maximizes, and cost increases simultaneously.
In view of above problem, problem of the present invention is to provide media such as can preventing bank note to block and can tackle Magnetic Sensor and device for identifying sheet that high sensitivity requires.
In addition, be to provide energy device for identifying sheet and Magnetic Sensor that enough common sensor detections utilize the 1st figure of magnetic material formation and utilize the 2nd figure of nonmagnetic conductive material formation.
In order to solve above-mentioned problem, Magnetic Sensor of the present invention, have the air gap opening sensor cover core stack and be configured in field coil in the aforementioned air gap, wherein, in aforementioned air gap, than close sensor as aforementioned face one side of the aforementioned field coil in this air gap, dispose nonmagnetic wear member with electric conductivity.
In recognition device with such Magnetic Sensor, for example, the sensor as aforementioned face is disposed aforementioned Magnetic Sensor like that towards the transfer path that transmits as bank note, check and other scraps of paper class of aforementioned medium, aforementioned field coil is supplied with alternating current, the testing result of the changes of magnetic field when transmitting on aforementioned transfer path according to aforementioned scraps of paper class is discerned aforementioned scraps of paper class.
In the present invention, owing to dispose wear member in air gap, so medium such as bank note can not blocked by the opening of sensor cover.Therefore in addition,, therefore can reduce the gap of sensor cover and medium, have, owing to the structure that can also adopt medium to slide on sensor cover can improve sensitivity owing to need between sensor cover and medium, not dispose wearing plate.Have again,,, also can optimize Distribution of Magnetic Field, so can improve resolution even when therefore making the field coil excitation with high frequency requiring for the densification that adapts to figure and deep or light color because wear member has electric conductivity.Therefore, according to the present invention, can prevent that media such as bank note from blocking, but also can adapt to the high sensitivity requirement.
In the present invention, whole aforementioned wear member can adopt the member of the nonmagnetic high-abrasive material formation with electric conductivity.For example, as aforementioned high-abrasive material, the material that can adopt aluminium or stainless steel to constitute.
In the present invention, as aforementioned wear member, also can adopt member at the face of the sensor as aforementioned at least one side configuration high-abrasive material of nonmagnetic conductive material.In this case, can adopt member that nonmagnetic conductive material is constituted, with the stacked structure of member that high-abrasive material constitutes, perhaps adopt the structure that forms wear-resistant material layer in the face of sensor as aforementioned at least one side of nonmagnetic conductive material.Such high-abrasive material for example is a stupalith.About form the wear member of wear-resistant material layer in one side of sensor cover at least of nonmagnetic conductive material, can adopt method such as the one side spraying plating stupalith of sensor cover at least of nonmagnetic conductive materials such as aluminium or stainless steel or form the formations such as method of filming that comprise ceramic powders, have again, also can apply coating and constitute by one side of sensor cover at least to nonmagnetic conductive material.
In addition, in order to solve above-mentioned problem, device for identifying sheet of the present invention, has the Magnetic Sensor on the transfer path that is configured in scraps of paper class, and be identified in the aforementioned scraps of paper class that transmits on the aforementioned transfer path according to the testing result of this Magnetic Sensor, wherein, aforementioned Magnetic Sensor comprises: have the core stack towards the magnetosensitive portion of aforementioned transfer path, and the field coil used of the test pattern that is wound on this core stack and on aforementioned transfer path, produces magnetic field by supplying with alternating current, the testing result of the changes of magnetic field when transmitting on aforementioned transfer path according to aforementioned scraps of paper class detects the 1st figure that utilizes magnetic material to form on the aforementioned scraps of paper class, and the 2nd figure that utilizes nonmagnetic conductive material to form on the aforementioned scraps of paper class.
In the relevant device for identifying sheet of the present invention, owing to use and to comprise core stack and be wound on this core stack and on transfer path, produce the Magnetic Sensor of the field coil that the test pattern in magnetic field uses with magnetosensitive portion, in the testing result of the changes of magnetic field when therefore scraps of paper class transmits, comprise the changes of magnetic field that causes because of the 1st figure that utilizes magnetic material to form on the scraps of paper class on transfer path.Thereby, utilize Magnetic Sensor, can detect the 1st figure.In addition, the Magnetic Sensor that in the relevant device for identifying sheet of the present invention, uses, because the field coil that utilizes test pattern to use produces magnetic field on transfer path, when therefore scraps of paper class transmits, produce eddy current in the 2nd figure that on scraps of paper class, utilizes nonmagnetic conductive material to form on transfer path.Thereby, in the testing result of the changes of magnetic field when scraps of paper class transmits, comprise the changes of magnetic field that causes because of the 2nd figure on the scraps of paper class on transfer path.Thereby, utilize Magnetic Sensor, can detect the 2nd figure.So, according to the present invention,, detect the 1st figure that utilizes magnetic material formation and the 2nd figure that utilizes nonmagnetic conductive material to form owing to can utilize common sensor, therefore can the simplification device structure.Like this, can realize the miniaturization and the low cost of device for identifying sheet.
In the present invention, aforementioned the 2nd figure for example is the hologram that utilizes nonmagnetic metal material to form.
In the present invention, aforementioned Magnetic Sensor can adopt any of self-excitation type or separated exciting.
In the present invention, aforementioned Magnetic Sensor is preferably in the field coil of coiling former figures detection usefulness on the aforementioned core stack and the coil that differential detection is used, the changes of magnetic field that the changes of magnetic field that the field coil that utilizes former figures to detect usefulness produces, the coil of using with aforementioned differential detection produce poor carries out former figures and detects.That is, in the present invention, preferably carry out differential detection,,, therefore can discern scraps of paper class with high precision owing to be not subjected to the influence of environmental changes such as temperature according to such structure.
In addition, in the present invention, the Magnetic Sensor of scraps of paper class identification usefulness is that identification has formed the Magnetic Sensor that utilizes the 1st figure that magnetic material forms and utilize the scraps of paper class identification usefulness that the scraps of paper class of the 2nd figure that nonmagnetic conductive material forms uses, comprise: have the core stack of magnetosensitive portion and be wound on this core stack, and by supplying with the field coil that test pattern that alternating current produces magnetic field is used.
In the present invention, owing to dispose wear member in air gap, so medium such as bank note can not blocked by the opening of sensor cover.Therefore in addition,, therefore can reduce the gap of sensor cover and medium, have, owing to the structure that can also adopt medium to slide on sensor cover can improve sensitivity owing to need between sensor cover and medium, not dispose wearing plate.Have again,,, also can optimize Distribution of Magnetic Field, so can improve resolution even when therefore making the field coil excitation with high frequency requiring for the densification that adapts to figure and deep or light color because wear member has electric conductivity.Therefore, according to the present invention, can prevent that media such as bank note from blocking, but also can adapt to the high sensitivity requirement.
In addition, in the present invention, owing to use and to comprise core stack and be wound on this core stack and on transfer path, produce the Magnetic Sensor of the field coil that the test pattern in magnetic field uses with magnetosensitive portion, in the testing result of the changes of magnetic field when therefore scraps of paper class transmits, comprise the changes of magnetic field that causes because of the 1st figure that utilizes magnetic material to form on the scraps of paper class on transfer path.Thereby, utilize Magnetic Sensor, can detect the 1st figure.In addition, the Magnetic Sensor that in the relevant device for identifying sheet of the present invention, uses, because the field coil that utilizes test pattern to use produces magnetic field on transfer path, when therefore scraps of paper class transmits, produce eddy current in the 2nd figure that on scraps of paper class, utilizes nonmagnetic conductive material to form on transfer path.Thereby, in the testing result of the changes of magnetic field when scraps of paper class transmits, comprise the changes of magnetic field that causes because of the 2nd figure on the scraps of paper class on transfer path.Thereby, utilize Magnetic Sensor, can detect the 2nd figure.So, according to the present invention,, detect the 1st figure that utilizes magnetic material formation and the 2nd figure that utilizes nonmagnetic conductive material to form owing to can utilize common sensor, therefore can the simplification device structure.Like this, can realize the miniaturization and the low cost of device for identifying sheet.
Description of drawings
Figure 1 shows that the pie graph of the major part formation of using device for identifying sheet of the present invention.
Fig. 2 (a) and (b) are the schematic diagram of using the self-excitation type Magnetic Sensor that can use in the device for identifying sheet of the present invention, the schematic diagram that reaches the separated exciting Magnetic Sensor.
Fig. 3 (a) and (b), (c) are for using the key diagram of the self-excitation type Magnetic Sensor that can use in the device for identifying sheet of the present invention.
The key diagram of the driving circuit when Fig. 4 adopts the differential detection method for using in the device for identifying sheet of the present invention.
Fig. 5 (a) and (b) be the self-excitation type Magnetic Sensor that uses in the relevant device for identifying sheet of an example of the present invention cut-open view, with and the amplification view of sensor cover periphery.
Fig. 6 (a) and (b) are depicted as the key diagram of an example of the scraps of paper class of using device for identifying sheet setting of the present invention and the key diagram of the output of the sensor when these scraps of paper are set.
Fig. 7 (a) and (b) for to use device for identifying sheet of the present invention be provided with the test usefulness the scraps of paper time resulting output key diagram and to the relevant device for identifying sheet of reference example be provided with the test usefulness the scraps of paper time resulting output key diagram.
Fig. 8 (a) and (b) be the self-excitation type Magnetic Sensor that uses in the relevant device for identifying sheet of other example of the present invention cut-open view, with and the amplification view of sensor cover periphery.
Label declaration
1 device for identifying sheet
2 scraps of paper (medium)
3 transfer paths
10 Magnetic Sensors (Magnetic Sensor of scraps of paper class identification usefulness)
11 core stacks
The field coil that 12 test pattern are used
The coil that 15 differential detection are used
16,17 air gaps
18,19 wear members
110 sensor covers
118 magnetosensitive portions
191 high-abrasive materials
192 conductive materials
Embodiment
Below, with reference to accompanying drawing, the device for identifying sheet of using Magnetic Sensor of the present invention and adopting this Magnetic Sensor is described.
(whole formation)
Figure 1 shows that the pie graph of the major part formation of using device for identifying sheet of the present invention.In Fig. 1, the device for identifying sheet 1 of this form, it is the figure that on the paper of the scraps of paper such as bank note or check 2 (medium), forms in order to detect, discern its device true and false or kind, at the 2nd figure 22 that forms the 1st figure 21 that magnetic materials such as utilizing magnetic ink forms on the scraps of paper 2 and on the scraps of paper 2, utilize nonmagnetic conductive material such as aluminium to form.Device for identifying sheet 1 is discerned the true and false or kind of the scraps of paper 2 by detecting the 1st figure 21 and the 2nd figure 22 that forms on the scraps of paper 2.Here, form the 2nd figure 22 as hologram etc.
The device for identifying sheet 1 of this form has that keep making the downward state of the scraps of paper 2 connecting gear (not shown) constant and that transmit along transfer path 3, the Magnetic Sensor 10 that is configured in the centre position of transfer path 3, this Magnetic Sensor 10 is supplied with the power circuit (not shown) of alternating currents and handled from the testing circuit (not shown) of the output of Magnetic Sensor 10 etc.Here, Magnetic Sensor 10 is a plurality of towards the Width of transfer path 3 (direction that intersects with the direction of transfer of the scraps of paper 2) configuration, detects with time series in the scraps of paper 2 of transmission, the figure at the position by its lower position.In addition, the direction of transfer of the scraps of paper 2 is represented with arrow W.
(formation of Magnetic Sensor)
Fig. 2 (a) and (b) are the schematic diagram of using the self-excitation type Magnetic Sensor that can use in the device for identifying sheet of the present invention, the schematic diagram that reaches the separated exciting Magnetic Sensor.Fig. 3 (a) and (b), (c) are for using the key diagram of the self-excitation type Magnetic Sensor that can use in the device for identifying sheet of the present invention.The key diagram of the driving circuit when Fig. 4 adopts the differential detection method for using the Magnetic Sensor shown in Fig. 3 (a).Fig. 5 (a) and (b) for the cut-open view of using the self-excitation type Magnetic Sensor that uses in the device for identifying sheet of the present invention, with and the amplification view of sensor cover periphery.
In using device for identifying sheet 1 of the present invention, as Magnetic Sensor 10, can use the self-excitation type Magnetic Sensor 10 shown in Fig. 2 (a), reach any of the separated exciting Magnetic Sensor 10 shown in Fig. 2 (b).Self-excitation type Magnetic Sensor 10 shown in Fig. 2 (a) comprises the core stack 11 that has towards the magnetosensitive portion 118 of transfer path 3, be wound on this core stack 11 and produce field coil 12 that the test pattern in magnetic field uses and the resistance 13 that is electrically connected with the two ends of this field coil 12 on transfer path 3.The voltage Vout at the two ends of resistance 13 exports to testing circuit, utilizes this output, the changes of magnetic field in the time of can detecting the scraps of paper 2 and transmit on transfer path 3.Here, core stack 11 is formed by ferrite, permalloy or magnetic amorphous body etc.
Separated exciting Magnetic Sensor 10 shown in Fig. 2 (b) comprises the core stack 11 that has towards the magnetosensitive portion 118 of transfer path 3, is wound on this core stack 11 and the field coil 12 used in the test pattern that produces magnetic field on the transfer path 3 and be wound on the coil 15 that the differential detection on the core stack 11 is used.The voltage Vout at the two ends of the coil 15 that differential detection is used exports to testing circuit, utilizes this output, the changes of magnetic field in the time of can detecting the scraps of paper 2 and transmit on transfer path 3.Here, core stack 11 is formed by ferrite, permalloy or magnetic amorphous body etc.
In such Magnetic Sensor 10, when input is adopted the differential detection method, as self-excitation type Magnetic Sensor 10, for example shown in Fig. 3 (a), comprise the core stack 11 of sensor cover 110 and be configured in the field coil 12 that the test pattern in the air gap 16 is used with air gap 16 openings.If it is more particularly bright, then core stack 11 have horizontal plate part 111 and in the middle of it and an end and the other end amount to 6 vertical plate parts 112,113,114,115,116,117 towards what transfer path 3 and opposition side thereof extended, utilize the lower surface of vertical plate part 112,113,114 to constitute sensor cover 110.Thereby, in core stack 11, between vertical plate part 112 and 113, and vertical plate part 112 and 114 between be formed on the air gap 16 of sensor cover 110 upper sheds, in this air gap 16 configure volumes on the vertical plate part 112 like that, the field coil 12 used of the test pattern that constitutes by voice coil loudspeaker voice coil, the end of this vertical plate part 112 is used as magnetosensitive portion 118.In addition, in core stack 11, between vertical plate part 115 and 116, and vertical plate part 115 and 117 between also forming the air gap 17 of opening with sensor cover 110 opposition sides, the coil 15 that configure volumes differential detection such on the vertical plate part 115, that be made of voice coil loudspeaker voice coil is used in this air gap 17.Here, field coil that test pattern is used 12 is connected in series with the coil 15 that differential detection is used, and alternating current is supplied with at its two ends, and, the tie point output signal of the coil 15 that the field coil of using from test pattern 12 and differential detection are used.
In addition, when input is not adopted the differential detection method, as self-excitation type Magnetic Sensor 10, for example shown in Fig. 3 (b), can adopt from the centre of horizontal plate part 111 and the core stack 11 of the E word shape that amounts to 3 vertical plate parts 112,113,114 that extend towards transfer path 3 end and the other end, utilize the lower surface of vertical plate part 112,113,114 to constitute sensor cover 110.Thereby, in core stack 11, between vertical plate part 112 and 113, and vertical plate part 112 and 114 between be formed on the air gap 16 of sensor cover 110 upper sheds, in this air gap 16 configure volumes on the vertical plate part 112 like that, the field coil 12 used of the test pattern that constitutes by voice coil loudspeaker voice coil, the end of this vertical plate part 112 is used as magnetosensitive portion 118.
Have again, self-excitation type Magnetic Sensor 10 when input is not adopted the differential detection method, shown in Fig. 3 (c), can adopt from the centre of horizontal plate part 111 core stack of the T word shape of 1 vertical plate part 112 that extends towards transfer path 3, in this case, the field coil 12 that the coiling test pattern is used on vertical plate part 112, the end of vertical plate part 112 is used as magnetosensitive portion 118.In addition, in this Magnetic Sensor 10, do not form air gap.
Adopt the Magnetic Sensor 10 shown in Fig. 3 (a), when utilizing the differential detection method to carry out input, adopting driving circuit shown in Figure 4.The coil 15 that this driving circuit has field coil 12 that each test pattern of a plurality of Magnetic Sensors 10 uses, use each differential detection supply with alternating currents public power circuit 40 and with each Magnetic Sensor 10 corresponding a plurality of sensor signal processing circuit 30.Sensor signal processing circuit 30 is made of rectification circuits such as differential amplifier 31, half-wave rectifying circuit or full-wave rectifying circuit 32, low-pass filter 33 and amplifier 34 etc., will amplify from the output signal of each Magnetic Sensor 10.In addition, by the output pattern of comparison, discern the true and false or kind of the scraps of paper 2 from each sensor signal processing circuit 30 output.
In addition, in the Magnetic Sensor shown in Fig. 3 (a) and (b) 10, shown in Fig. 5 (a) and (b), in the air gap 16 of sensor cover 110 openings, at the field coil of using than the test pattern 12 nonmagnetic wear member 18 that configuration has electric conductivity near sensor cover 110 1 sides, the lower surface of this wear member 18 and sensor cover 110 constitute with one side.As such wear member 18, in this form, be the whole member that constitutes by nonmagnetic high-abrasive material with electric conductivity, for example, that aluminium sheet or corrosion resistant plate is fixing with bonding agent etc.
(action)
Fig. 6 (a) and (b) are depicted as the key diagram of an example of the scraps of paper class of the device for identifying sheet setting of this form and the key diagram of the output of the sensor when these scraps of paper are set.
In the device for identifying sheet 1 of the relevant Magnetic Sensor with this form 10 of this form, different with the situation of using the MR element, as shown in Figure 1, the 2nd figure 22 that forms for nonmagnetic conductive materials such as utilizing aluminium also can detect.Promptly, shown in Fig. 6 (a), form the 1st figure 21 that forms with magnetic ink, the scraps of paper 2 that reach the 2nd figure 22 that constitutes by hologram on paper as if being provided with, then from measure Fig. 6 (a), use the Magnetic Sensor 10 of the position shown in the arrow L, can access the output shown in Fig. 6 (b).
In the output shown in Fig. 6 (b), at first, the area L 1 that forms the 1st figure 21 in the scraps of paper 2 is by among the t1 during below the Magnetic Sensor 10, because magnetic permeability rises because of the 1st figure 21, therefore exporting becomes high level.Then, the area L 1 that in the scraps of paper 2, forms the 1st figure 21 and the area L 2 between the area L 3 that forms the 2nd figure 22 pass through Magnetic Sensor 10 below during among the t2, owing to do not form any one figure of the 1st figure 21 and the 2nd figure 22 in the area L 2, therefore output becomes intermediate level.The area L 3 that forms the 2nd figure 22 in the scraps of paper 2 is by among the t3 during below the Magnetic Sensor 10, owing to produce eddy current in the 2nd figure 22, therefore output becomes low level.Then, the area L 3 that in the scraps of paper 2, forms the 2nd figure 22 passed through Magnetic Sensor 10 below after, area L 4 by t4 during below the Magnetic Sensor 10 in owing to do not form any one figure of the 1st figure 21 and the 2nd figure 22 in the area L 4, therefore output becomes intermediate level.
(the main effect of this form)
Fig. 7 (a) and (b) for to use device for identifying sheet of the present invention be provided with the test usefulness the scraps of paper time resulting output key diagram and to the relevant device for identifying sheet of reference example be provided with the test usefulness the scraps of paper time resulting output key diagram.
In the Magnetic Sensor 10 and device for identifying sheet 1 of this form, shown in Fig. 5 (a) and (b), owing to dispose wear member 18 air gap 16 in, so the scraps of paper 2 such as bank note can not blocked by the opening of sensor cover 110.In addition, since not need between sensor cover 110 and the transfer path 3, be to dispose wearing plate between the sensor cover 110 and the scraps of paper 2, therefore can reduce the gap of the sensor cover 110 and the scraps of paper 2, have again, because therefore the structure that can also adopt the scraps of paper 2 to slide on sensor cover 110 can improve sensitivity.Have again,,, also can optimize Distribution of Magnetic Field, so can improve resolution even when therefore making field coil 12 excitations that test pattern uses with high frequency requiring for the densification that adapts to figure and deep or light color because wear member 18 has electric conductivity.
For example, in the device for identifying sheet 1 of Magnetic Sensor 10 with this form, to form the test of the 1st figure 21 of strip with prescribed distance out-of-date at transfer path 3 upper reaches with the scraps of paper 2 making, and the signal output as producing along with its displacement can access the result shown in Fig. 7 (a).Different therewith is, in having air gap 16, do not dispose in the device for identifying sheet of the relevant Magnetic Sensor of the comparative example of wear member 18, make above-mentioned test out-of-date at transfer path 3 upper reaches with the scraps of paper 2, signal output as producing along with its displacement can access the result shown in Fig. 7 (b).
If comparison diagram 7 (a) and (b), then as can be known, in having the device for identifying sheet 1 of using Magnetic Sensor 10 of the present invention, the device for identifying sheet of the Magnetic Sensor relevant with having comparative example is compared, the baseline of the peak value corresponding with the 1st figure 21 is low, the resolution height.
In addition, in the device for identifying sheet 1 of this form, owing to use and to comprise core stack 11 like that shown in Fig. 3 (a) and (b), (c) and be wound on the core stack 11 and on transfer path 3, produce the Magnetic Sensor 10 of the field coil 12 that the test pattern in magnetic field uses with magnetosensitive portion 118, in the testing result of the changes of magnetic field when therefore the scraps of paper 2 transmit, comprise the changes of magnetic field that causes because of the 1st figure 21 that utilizes magnetic material to form on the scraps of paper 2 on transfer path 3.Thereby, utilize Magnetic Sensor 10, can detect the 1st figure 21.In addition, the Magnetic Sensor 10 that in the relevant device for identifying sheet 1 of this form, uses, because the field coil 12 that utilizes test pattern to use produces magnetic field on transfer path 3, when therefore the scraps of paper 2 transmit, produce eddy current in the 2nd figure 22 that on the scraps of paper 2, utilizes nonmagnetic conductive material to form on transfer path 3.Thereby, in the testing result of the changes of magnetic field the when scraps of paper 2 transmit, comprise the changes of magnetic field that causes because of the 2nd figure 22 on the scraps of paper 2 on transfer path 3.Thereby, utilize Magnetic Sensor 10, can detect the 2nd figure 22.So, according to this form,, detect the 1st figure 21 that utilizes magnetic material formation and the 2nd figure 22 that utilizes nonmagnetic conductive material to form owing to can utilize public Magnetic Sensor 10, therefore can the simplification device structure.Like this, can realize the miniaturization and the low cost of device for identifying sheet 1.
In addition, when detection signal owing to adopt the differential detection method, therefore can compensation temperature etc. the influence of environmental change, so can discern the scraps of paper 2 with high precision.
[other example]
Fig. 8 (a) and (b) for the cut-open view of using the self-excitation type Magnetic Sensor that uses in the device for identifying sheet of the present invention, with and the amplification view of sensor cover periphery.In addition,, therefore public part is added same label, and omit their detailed description because the basic comprising of this form is identical with the Magnetic Sensor 10 shown in Fig. 5 (a) and (b).
Self-excitation type Magnetic Sensor 10 shown in Fig. 8 (a) and (b) is also identical with the Magnetic Sensor 10 shown in Fig. 5 (a) and (b), comprises the core stack 11 of the sensor cover 110 with air gap 16 openings and is configured in the field coil 12 that the test pattern in the air gap 16 is used.If it is more particularly bright, then core stack 11 have horizontal plate part 111 and in the middle of it and an end and the other end amount to 6 vertical plate parts 112,113,114,115,116,117 towards what transfer path 3 and opposition side thereof extended, utilize the lower surface of vertical plate part 112,113,114 to constitute sensor cover 110.Thereby, in core stack 11, between vertical plate part 112 and 113, and vertical plate part 112 and 114 between be formed on the air gap 16 of sensor cover 110 upper sheds, in this air gap 16 configure volumes on the vertical plate part 112 like that, the field coil 12 used of the test pattern that constitutes by voice coil loudspeaker voice coil, the end of this vertical plate part 112 is used as magnetosensitive portion 118.In addition, in core stack 11, between vertical plate part 115 and 116, and vertical plate part 115 and 117 between also forming the air gap 17 of opening with sensor cover 110 opposition sides, the coil 15 that configure volumes differential detection such on the vertical plate part 115, that be made of voice coil loudspeaker voice coil is used in this air gap 17.Here, field coil that test pattern is used 12 is connected in series with the coil 15 that differential detection is used, and alternating current is supplied with at its two ends, and, the tie point output signal of the coil 15 that the field coil of using from test pattern 12 and differential detection are used.
In the Magnetic Sensor 10 and device for identifying sheet 1 that constitute like this, identical with the Magnetic Sensor 10 shown in Fig. 5 (a) and (b), owing to dispose wear member 18 air gap 16 in, so the scraps of paper 2 such as bank note can not blocked by the opening of sensor cover 110 yet.In addition, since not need between sensor cover 110 and the transfer path 3, be to dispose wearing plate between the sensor cover 110 and the scraps of paper 2, therefore can reduce the gap of the sensor cover 110 and the scraps of paper 2, have again, because therefore the structure that can also adopt the scraps of paper 2 to slide on sensor cover 110 can improve sensitivity.Have again,,, also can optimize Distribution of Magnetic Field, so can improve resolution even when therefore making field coil 12 excitations that test pattern uses with high frequency requiring for the densification that adapts to figure and deep or light color because wear member 18 has electric conductivity.
In addition, when constituting wear member with multiple material, in the Magnetic Sensor shown in Fig. 8 (a) and (b) 10, be the member that will constitute by nonmagnetic conductive material, with the member overlay configuration that constitutes by high-abrasive material, but also can adopt the structure that forms wear-resistant material layer in one side of sensor cover at least of nonmagnetic conductive material.For such wear member, for example can adopt method such as the one side spraying plating stupalith of sensor cover at least of nonmagnetic conductive materials such as aluminium or stainless steel or form the formations such as method of filming that comprise ceramic powders, have again, also can wait and constitute by one side of sensor cover at least plating Ni (nickel)-P (phosphorus) to nonmagnetic conductive materials such as stainless steels.In addition, Ni-P can be that 10-12% forms nonmagnetic plated film with the P component.Wearing quality is also high, is suitable as abrasive coating.
Claims (7)
1. Magnetic Sensor comprises: have the air gap opening sensor cover core stack and be configured in field coil in the described air gap, it is characterized in that,
In described air gap,, dispose nonmagnetic wear member with electric conductivity than close described sensor cover one side of the described field coil in this air gap.
2. Magnetic Sensor as claimed in claim 1 is characterized in that,
Described wear member is made of the nonmagnetic high-abrasive material that integral body has electric conductivity.
3. Magnetic Sensor as claimed in claim 2 is characterized in that,
Described high-abrasive material is made of aluminium or stainless steel.
4. Magnetic Sensor as claimed in claim 1 is characterized in that,
Described wear member disposes high-abrasive material in described at least sensor cover one side of nonmagnetic conductive material.
5. Magnetic Sensor as claimed in claim 4 is characterized in that,
Described high-abrasive material is made of stupalith.
6. Magnetic Sensor as claimed in claim 1 is characterized in that,
The medium that described Magnetic Sensor identification is made of bank note, check and other scraps of paper class.
7. a device for identifying sheet is characterized in that,
Described device for identifying sheet has the Magnetic Sensor of each regulation of claim 1 to 6,
Described sensor cover is disposed described Magnetic Sensor like that towards the transfer path that transmits the medium that is made of bank note, check and other scraps of paper class,
Described field coil is supplied with alternating current, and the testing result of the changes of magnetic field when transmitting on described transfer path according to described scraps of paper class is discerned described scraps of paper class.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP134507/2005 | 2005-05-02 | ||
| JP2005134507A JP4771738B2 (en) | 2005-05-02 | 2005-05-02 | Paper sheet identification device and magnetic sensor for paper sheet identification |
| JP135160/2005 | 2005-05-06 | ||
| JP2005135160A JP4827437B2 (en) | 2005-05-06 | 2005-05-06 | Magnetic sensor and paper sheet identification device |
| PCT/JP2006/307552 WO2006120825A1 (en) | 2005-05-02 | 2006-04-10 | Magnetic sensor and device for identifying sheet |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010100032432A Division CN101777206B (en) | 2005-05-02 | 2006-04-10 | Magnetic sensor and device for identifying sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101167106A CN101167106A (en) | 2008-04-23 |
| CN101167106B true CN101167106B (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200680014683XA Expired - Fee Related CN101167106B (en) | 2005-05-02 | 2006-04-10 | Magnetic sensor and paper sheet identification device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4771738B2 (en) |
| CN (1) | CN101167106B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104123781B (en) * | 2010-02-05 | 2017-01-18 | 日本电产三协株式会社 | Magnetic pattern detection device |
| JP5542466B2 (en) * | 2010-02-05 | 2014-07-09 | 日本電産サンキョー株式会社 | Magnetic sensor device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5261518A (en) * | 1993-03-11 | 1993-11-16 | Brandt, Inc. | Combined conductivity and magnetic currency validator |
| US5457382A (en) * | 1990-07-17 | 1995-10-10 | Gao Gesellschaft Fur Automation Und Organisation Mbh | Apparatus for testing documents having magnetic properties |
| CN1384472A (en) * | 2001-04-13 | 2002-12-11 | 株式会社实值留场 | Magnetic head |
| CN1385816A (en) * | 2001-05-16 | 2002-12-18 | 松下电器产业株式会社 | Magnetic sensor and paper note identifier using same |
| CN2596460Y (en) * | 2002-12-24 | 2003-12-31 | 中国印钞造币总公司 | Sensor for measuring negotiable securities |
-
2005
- 2005-05-02 JP JP2005134507A patent/JP4771738B2/en not_active Expired - Fee Related
-
2006
- 2006-04-10 CN CN200680014683XA patent/CN101167106B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457382A (en) * | 1990-07-17 | 1995-10-10 | Gao Gesellschaft Fur Automation Und Organisation Mbh | Apparatus for testing documents having magnetic properties |
| US5261518A (en) * | 1993-03-11 | 1993-11-16 | Brandt, Inc. | Combined conductivity and magnetic currency validator |
| CN1384472A (en) * | 2001-04-13 | 2002-12-11 | 株式会社实值留场 | Magnetic head |
| CN1385816A (en) * | 2001-05-16 | 2002-12-18 | 松下电器产业株式会社 | Magnetic sensor and paper note identifier using same |
| CN2596460Y (en) * | 2002-12-24 | 2003-12-31 | 中国印钞造币总公司 | Sensor for measuring negotiable securities |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2002-183796A 2002.06.28 |
| JP特开2003-177169A 2003.06.27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4771738B2 (en) | 2011-09-14 |
| JP2006309669A (en) | 2006-11-09 |
| CN101167106A (en) | 2008-04-23 |
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