WO2016170885A1 - Magnetic sensor device - Google Patents
Magnetic sensor device Download PDFInfo
- Publication number
- WO2016170885A1 WO2016170885A1 PCT/JP2016/058775 JP2016058775W WO2016170885A1 WO 2016170885 A1 WO2016170885 A1 WO 2016170885A1 JP 2016058775 W JP2016058775 W JP 2016058775W WO 2016170885 A1 WO2016170885 A1 WO 2016170885A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic
- magnet
- magnetosensitive element
- magnetosensitive
- sensor device
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/265—Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track
Definitions
- the present invention relates to a magnetic sensor device for detecting a magnetic pattern.
- a magnetic sensor device including a magnet that generates a bias magnetic field and a magnetosensitive element such as a magnetoresistive element is used.
- the magnetosensitive element detects a change in the magnetic field when the magnetic pattern passes through the detection position of the magnetic sensor device, and outputs a signal corresponding to the change in its resistance value.
- a magnetic sensor device is described in Patent Document 1.
- the magnetic pattern is printed with a magnetic ink containing a hard material such as ferrite powder, or a magnetic ink containing a soft material (soft magnetic material) such as a soft magnetic stainless steel powder.
- the magnetic pattern has a magnetic permeability, so that the magnetosensitive element detects a change in the magnetic field caused by the magnetic permeability.
- the magnetosensitive element detects a change in the magnetic field due to the residual magnetic flux density, but the change in the magnetic field due to the residual magnetic flux density. Is detected by being superimposed on the change in the magnetic field due to the magnetic permeability, so that the signal component derived from the residual magnetic flux density cannot be separated. Therefore, it cannot be determined whether the magnetic pattern is printed with magnetic ink containing hard material or magnetic ink containing soft material.
- an object of the present invention is to provide a magnetic sensor device capable of discriminating either a hard material or a soft material from a magnetic pattern applied to a medium.
- the present invention provides a magnetic sensor device for detecting a magnetic pattern applied to a medium that moves relative to a moving surface by a magnetosensitive element, a magnet that applies a bias magnetic field to the medium, A downstream yoke disposed on the downstream side of the magnet in the moving direction of the medium, and as the magnetosensitive element, the magnet facing the downstream yoke in an orthogonal direction perpendicular to the moving surface, Comprises a first magnetosensitive element disposed at a first position that does not oppose, and a second magnetosensitive element disposed at a second position that opposes the magnet in the orthogonal direction.
- the second magnetosensitive element is disposed at the second position facing the magnet to which the bias magnetic field is applied. Therefore, when the medium passes through the second position along the moving surface, the change in the magnetic field due to the magnetic permeability of the magnetic pattern can be detected by the second magnetosensitive element.
- the first magnetosensitive element is disposed at a first position facing a yoke disposed downstream of the magnet to which the bias magnetic field is applied.
- the first position is in a region separated from the region facing the magnet, the change in the direction of the magnetic field is small and the magnetic flux density is small when the medium passes through the second position along the moving surface.
- the signal component output from the first magnetosensitive element arranged at the first position is substantially output from the magnetic permeability. Can be zero.
- the first position is in a region away from the region facing the magnet on the downstream side of the magnet in the moving direction of the medium, the first magnetosensitive element arranged in the first position is caused by the residual magnetic flux density of the magnetic pattern. The change of the magnetic field can be detected. Therefore, based on the signal output from the first magnetosensitive element, it is possible to determine whether the magnetic pattern applied to the medium is a hard material or a soft material.
- the first position and the second position may be in the bias magnetic field from the magnet to the downstream yoke via the moving surface.
- the first magnetosensitive element has a magnetosensitive direction in the moving direction. In this way, the first magnetosensitive element detects the moving direction component of the change in the direction of the magnetic field. Thereby, it becomes easy to make the output of the signal component derived from the magnetic permeability substantially zero for the signal output from the first magnetosensitive element.
- an MR element can be used as the magnetosensitive element.
- the present invention it is desirable to have an upstream yoke disposed on the upstream side of the magnet in the moving direction. If it does in this way, it can control that the magnetic field which a magnet generates by downstream Yuku and an upstream yoke spreads more than necessary. Therefore, it is possible to prevent the magnetic sensing element from detecting a change in the magnetic field due to the movement of the magnetic material different from the medium. In this way, it is possible to prevent or suppress the magnetosensitive element from being affected by the magnetic field outside the apparatus.
- the end surface on the moving surface side in the magnet, the end surface on the moving surface side in the downstream yoke, and the end surface on the moving surface side in the upstream yoke are located on the same plane, It is desirable to extend parallel to the moving surface.
- the magnetosensitive element includes a third magnetosensitive element disposed at a third position facing the upstream yoke in a direction orthogonal to the moving surface and not facing the magnet. be able to.
- the third magnetosensitive element arranged at the third position. That is, when the relative movement direction of the medium with respect to the apparatus is reversed, the medium passes through the third position after passing through the position facing the magnet along the moving surface. Therefore, when a magnetic pattern made of a hard material is applied to the medium, the hard material is magnetized when the medium passes through the third position. Therefore, a change in the magnetic field due to the residual magnetic flux density of the magnetic pattern (hard material) can be detected by the third magnetosensitive element.
- this invention has a 2nd magnet which applies a 2nd bias magnetic field to the said medium, and the said 2nd magnet shall be located in the downstream of the said downstream yoke in the said moving direction. .
- the change of the magnetic field caused by the residual magnetic flux density of the magnetic pattern (hard material) is caused by the first magnetosensitive element arranged at the first position.
- the medium passes through the first position after passing through the position facing the second magnet along the moving surface. Therefore, when a magnetic pattern made of a hard material is applied to the medium, the hard material is magnetized when the medium passes through the first position. Therefore, a change in the magnetic field due to the residual magnetic flux density of the magnetic pattern (hard material) can be detected by the first magnetosensitive element.
- a plurality of the first magnetosensitive elements and the second magnetosensitive elements are respectively arranged in a direction along the moving surface so as to intersect the moving direction, and the magnet includes a plurality of the second magnetosensitive elements. It is desirable to extend in the arrangement direction of the magnetosensitive elements and to face each second magnetosensitive element. In this way, the magnetic pattern can be detected in a wide range extending in the width direction of the medium. Further, since one long magnet extending in the arrangement direction of the first magnetosensitive elements is used as the magnet, a plurality of magnets corresponding to the first magnetosensitive elements are arranged in the arrangement direction of the first magnetosensitive elements.
- the downstream yoke extends along the magnet and opposes each first magnetosensitive element. Since the magnetic field generated by the magnet is guided to the downstream yoke, in this way, the magnetic field of the magnet formed so as to pass through the transport surface is made uniform along the magnetic sensing direction of each magnetic sensing element. be able to. As a result, it is possible to prevent or suppress the occurrence of a difference in the output from the first magnetosensitive element due to the position of the first magnetosensitive element in the arrangement direction.
- the first magnetic sensitive element and the second magnetic sensitive element in the width direction of the transport path orthogonal to the moving direction of the medium are such that the distance from the end of the magnet is the moving direction of the medium of the magnet and It is desirable that they are separated by 1/2 or more of the height dimension orthogonal to the width direction of the transport path.
- the magnetic pattern applied to the medium is a hard material or a soft material based on a signal output from the first magnetosensitive element.
- FIG. 1 is an explanatory view schematically showing a main part configuration of a magnetic sensor device to which the present invention is applied.
- the magnetic sensor device 20 of the present invention detects the magnetic pattern M applied to the sheet-like medium 3 such as banknotes conveyed along the conveyance path 21 (conveying surface 2) by the magnetic sensitive elements 11 and 12.
- the magnetic pattern M detected by the magnetic sensor device 20 includes one printed with magnetic ink containing a hard material and one printed with magnetic ink containing a soft material.
- the hard material is a magnetic material that is easily magnetized when applied with a magnetic field from the outside, such as a magnetic material used in a magnet, having a large hysteresis and a high residual magnetic flux density.
- the soft material is a magnetic material that has a small hysteresis, a low residual magnetic flux density, and is not easily magnetized, like a core material of a motor or a magnetic head.
- the magnetic sensor device 20 includes a sensor unit 1 and a transport mechanism 22 that transports the medium 3 along a transport path 21 that passes through a detection position by the sensor unit 1.
- the transport mechanism 22 includes a transport roller 23 and a transport motor 24 serving as a drive source for the transport roller 23.
- the sensor unit 1 extends in the width direction Y of the transport path 21 orthogonal to the transport direction X1 of the medium 3.
- the conveyance roller 23 is disposed to face the sensor unit 1 in the orthogonal direction Z orthogonal to the conveyance surface 2 that is a moving surface.
- the sensor unit 1 is accommodated in a nonmagnetic case 25.
- the facing surface facing the transport roller 23 defines the detection position of the magnetic pattern M by the magnetic sensor device 20 and constitutes a part of the transport surface 2 in the transport path 21.
- the sensor unit 1 includes a plurality of MR substrates 26 on which the first magnetosensitive element 11 and the second magnetosensitive element 12 are formed.
- the MR substrate 26 is arranged in the width direction Y along the transport surface 2. Therefore, the sensor unit 1 includes a plurality of first magnetosensitive elements 11 arranged in the width direction Y and a plurality of second magnetosensitive elements 12 arranged in the width direction Y.
- the second magnetosensitive element 12 is disposed upstream of the first magnetosensitive element 11 in the transport direction X1.
- the sensor unit 1 includes a permanent magnet 5, a downstream yoke 6 disposed on the downstream side of the permanent magnet 5 in the conveyance direction X ⁇ b> 1 of the medium 3, and an upstream yoke 7 disposed on the upstream side of the permanent magnet 5.
- the permanent magnet 5 applies a bias magnetic field 4 to the medium 3, the first magnetosensitive element 11 and the second magnetosensitive element 12 conveyed on the conveyance surface 2.
- the transport surface 2 is disposed on the opposite side (orthogonal direction Z side) of the permanent magnet 5, the downstream yoke 6 and the upstream yoke 7 with the first and second magnetosensitive elements 11 and 12 interposed therebetween. .
- the permanent magnet 5 is long and has a rectangular parallelepiped shape.
- the permanent magnet 5 extends with a constant width in the width direction Y (the arrangement direction of the plurality of first magnetosensitive elements 11).
- the permanent magnet 5 faces each second magnetosensitive element 12.
- the downstream yoke 6 abuts against the downstream end surface of the permanent magnet 5 and extends along the permanent magnet 5 with a constant width in the width direction Y.
- the downstream yoke 6 faces each first magnetosensitive element 11.
- the upstream yoke 7 is in contact with the upstream end surface of the permanent magnet 5 and extends along the permanent magnet 5 with a constant width in the width direction Y.
- the downstream yoke 6 and the upstream yoke 7 are each elongated and have a rectangular parallelepiped shape.
- the dimensions in the width direction Y of the permanent magnet 5, the downstream yoke 6 and the upstream yoke 7 are the same.
- the first magnetosensitive element 11 and the second magnetosensitive element 12 positioned at both end portions in the width direction Y are disposed at positions spaced from the end portion 5a of the permanent magnet 5 by a predetermined distance T or more.
- the specified distance T is 1 ⁇ 2 of the height dimension L in the vertical direction of the permanent magnet 5.
- FIG. 2 is an explanatory view of the arrangement of the permanent magnet 5 and the magnetic sensitive elements 11 and 12 in the sensor unit 1 of the magnetic sensor device 20 of the present invention.
- 3A is a graph of the resistance value-magnetic flux density characteristic curve of the first magnetosensitive element 11
- FIG. 3B is a graph of the resistance value-magnetic flux density characteristic curve of the second magnetosensitive element 12.
- FIG. 2 contrary to FIG. 1, the permanent magnet 5 is shown above the magnetic sensing elements 11 and 12 toward the drawing, and the conveying surface 2 is shown below the magnetic sensing elements 11 and 12 toward the drawing.
- the permanent magnet 5 is magnetized in a direction perpendicular to the transport surface 2.
- the permanent magnet 5 has the N pole facing the transport surface 2 side.
- the downstream yoke 6 contacts the permanent magnet 5 from the downstream side
- the upstream yoke 7 contacts the permanent magnet 5 from the upstream side.
- the end surface of the permanent magnet 5 on the side of the conveyance surface 2 and the end surface of the downstream yoke 6 and the upstream yoke 7 on the side of the conveyance surface 2 are located on the same plane and extend in parallel with the conveyance surface 2.
- the first magnetosensitive element 11 and the second magnetosensitive element 12 are both magnetoresistive elements. More specifically, it is an anisotropic magnetoresistive element (AMR (Anisotropic-Magneto-Resistance)) having a magnetoresistive pattern made of a thin film ferromagnetic metal.
- AMR Anasotropic-Magneto-Resistance
- the resistance value decreases according to the strength of the magnetic field.
- the magnetosensitive direction F of the first magnetosensitive element 11 and the second magnetosensitive element 12 is the conveyance direction X1, and the first magnetosensitive element 11 and the second magnetosensitive element 12 detect a change in the magnetic flux vector in the conveyance direction X1. .
- the first magnetosensitive element 11 is disposed at a first position A that faces the downstream yoke 6 and does not face the permanent magnet 5 in the orthogonal direction Z perpendicular to the transport surface 2.
- the second magnetosensitive element 12 is disposed at the second position B facing the permanent magnet 5 in the orthogonal direction Z.
- the second position B is upstream of the first position A in the transport direction X1.
- the first position A and the second position B are in the bias magnetic field 4 from the permanent magnet 5 to the downstream yoke 6 via the transport surface 2.
- the distance between the end surface of the downstream yoke 6 on the transport surface 2 side and the first magnetosensitive element 11 is the same as the distance between the end surface of the permanent magnet 5 on the transport surface 2 side and the second magnetosensitive element 12. is there.
- a bias magnetic field 4 (first magnetic flux vector Ha0) is applied so that the change in resistance value increases with respect to the change in magnetic flux density in the resistance value-magnetic flux density characteristics of the first magnetosensitive element 11. It is a position. In other words, at the first position A, when the first magnetosensitive element 11 is disposed, the resistance value R1 is plotted on the steep curve portion of the resistance value-magnetic flux density characteristic curve of FIG. It is a position.
- a bias magnetic field 4 (second magnetic flux vector Hb0) is applied so that the change in resistance value increases with respect to the change in magnetic flux density in the resistance value-magnetic flux density characteristics of the second magnetosensitive element 12. It is a position. In other words, at the second position B, when the second magnetosensitive element 12 is arranged, the resistance value R2 is plotted in a curve portion having a steep slope in the resistance value-magnetic flux density characteristic curve of FIG. It is a position.
- the first magnetic flux vector Ha0 at the first position A is inclined in the direction toward the downstream yoke 6 toward the downstream side.
- the second magnetic flux vector Hb0 at the second position B is inclined in the direction away from the permanent magnet 5 toward the downstream side.
- the inclination of the first magnetic flux vector Ha0 with respect to the orthogonal direction Z is larger than the inclination of the second magnetic flux vector Hb0 with respect to the orthogonal direction Z.
- the first magnetosensitive element 11 and the second magnetosensitive element 12 a semiconductor magnetoresistive element, a Hall element, an MI element (Magneto-Impedance element), a fluxgate type magnetic sensor, or the like may be used. Further, the first magnetosensitive element 11 may be disposed on the opposite side of the downstream yoke 6 with the transport surface 2 interposed therebetween. Similarly, the second magnetosensitive element 12 may be disposed on the opposite side of the permanent magnet 5 with the transport surface 2 interposed therebetween. Furthermore, the 1st magnetosensitive element 11 and the 2nd magnetosensitive element 12 may be arrange
- the second position B can be a position where at least a part of the second magnetosensitive element 12 faces the permanent magnet 5 in the orthogonal direction Z.
- the distance between the end face of the downstream yoke 6 on the transport surface 2 side and the first magnetosensitive element 11 is the distance between the end face of the permanent magnet 5 on the transport surface 2 side and the second magnetosensitive element 12. It may be different.
- the upstream yoke 7 may be omitted.
- the permanent magnet may be arranged with the south pole facing the transport surface 2 side.
- FIG. 4 is a schematic diagram showing the sensor unit 1 partially enlarged.
- FIG. 5 is an explanatory diagram of changes in the magnetic flux vectors Ha 0 and Hb 0 when the magnetic pattern M moves on the transport surface 2.
- FIG. 6 is an explanatory diagram of changes in the magnetic field when the magnetic pattern M including the hard material moves on the transport surface 2. 4 to 6, only the magnetic pattern M applied to the medium 3 is shown with the medium 3 omitted in order to easily show the changes in the magnetic flux vectors Ha0 and Hb0 and the change in the magnetic field.
- the bias magnetic field 4 is caused by the magnetic permeability of the magnetic pattern M.
- the direction of the magnetic flux changes so as to be absorbed by the magnetic pattern M.
- the second magnetic flux vector Hb0 passing through the second position B where the second magnetosensitive element 12 is disposed changes its direction before and after the transport direction X.
- the second magnetic flux vector Hb0 is inclined in the direction approaching the normal line (orthogonal direction Z) toward the magnetic pattern M (magnetic flux vector Hb1). As shown in FIG. 5 (b), it is inclined toward the downstream side of the first magnetic flux vector Hb0 (magnetic flux vector Hb2).
- the magnetic flux density is large (the magnetic flux vector Hb0 is large). Accordingly, the component Hbf in the magnetic sensing direction F of the magnetic flux vector Hb0 detected by the second magnetic sensing element 12 changes greatly. Thereby, the resistance value of the second magnetosensitive element 12 varies within a relatively large range S2 shown in FIG. 3B, and a signal corresponding to the variation of the resistance value is output from the second magnetosensitive element 12. .
- the direction of the first magnetic flux vector Ha0 passing through the first position A is also changed back and forth.
- the magnetic flux density of the bias magnetic field 4 passing through the first position A is small (magnetic flux vector Ha0) as schematically shown in FIG. Is small).
- the component Haf of the first magnetic flux vector Ha0 detected by the first magnetic sensing element 11 in the magnetic sensing direction F is the sensitivity of the first magnetic flux vector Ha0 detected by the second magnetic sensing element 12. It becomes smaller than the component Hbf in the magnetic direction F.
- the resistance value of the second magnetosensitive element 12 changes only in a very small range S1 shown in FIG. 3, corresponding to the resistance value fluctuation.
- the signal output from the second magnetosensitive element 12 is substantially zero.
- the magnetic pattern M applied to the medium 3 passes through the downstream detection position D facing the first position A on the transport surface 2, the magnetic pattern M is an area facing the permanent magnet 5 (critical path). Range). Therefore, when the magnetic pattern M is made of a hard material, the magnetic pattern M is magnetized. Therefore, as shown in FIG. 6A, the magnetic pattern M generates a residual magnetic field 8. On the other hand, when the magnetic pattern M is made of a soft material, the magnetic pattern M is not magnetized. Therefore, no residual magnetic field is generated as shown in FIG.
- the downstream side detection position D and the first position A are at positions deviating from the region facing the permanent magnet 5 (critical path range). Therefore, the first magnetosensitive element 11 detects a change in the magnetic field caused by the residual magnetic flux density of the magnetic pattern M when the magnetic pattern M is magnetized. Thereby, since the resistance value of the first magnetosensitive element 11 varies, a signal corresponding to the variation of the resistance value is output from the first magnetosensitive element 11. On the other hand, when the magnetic pattern M is not magnetized, the first magnetosensitive element 11 does not detect a change in the magnetic field due to the residual magnetic flux density of the magnetic pattern M. Does not output a signal corresponding to a change in resistance value.
- FIG. 7A is a graph showing an output example from the first magnetosensitive element 11 and an output example from the second magnetosensitive element 12 when the sensor unit 1 detects a magnetic pattern M made of a hard material.
- 7 (b) is a graph showing an output example from the first magnetosensitive element 11 and an output example from the second magnetosensitive element 12 when the sensor unit 1 detects a magnetic pattern M made of a soft material.
- FIG. 7A when the magnetic pattern M is made of a hard material, signals are output from both the second magnetic sensing element 12 and the first magnetic sensing element 11.
- FIG. 7B when the magnetic pattern M is made of a soft material, a signal is output from the second magnetosensitive element 12, but a signal is output from the first magnetosensitive element 11.
- a signal is output from the second magnetosensitive element 12
- a signal is output from the first magnetosensitive element 11.
- the magnetic sensor device 20 can determine whether the magnetic pattern M is formed of a hard material or a soft material based on a signal from the first magnetosensitive element 11.
- the magnetic information of the magnetic pattern M can be acquired based on the signal from the first magnetosensitive element 11 and the signal from the second magnetosensitive element 12.
- the magnetic pattern M is made of a soft material
- the magnetic information of the magnetic pattern M can be acquired based on the signal from the second magnetosensitive element 12.
- the magnetic sensor device 20 since the plurality of first magnetosensitive elements 11 and the plurality of second magnetosensitive elements 12 arranged in the width direction Y of the conveyance path 21 (conveyance surface 2) are provided, The magnetic pattern M applied to the medium 3 can be detected in a wide range extending in the width direction.
- the first magnetic sensing element 11 detects a component of the magnetic flux vector in the conveyance direction X1 (magnetic sensing direction F). Therefore, if the first magnetosensitive element 11 is disposed in a magnetic field portion including a magnetic flux vector directed in the transport direction X1 in the bias magnetic field 4, the first magnetosensitive element 11 can detect a change in the magnetic flux vector. On the other hand, when the first magnetosensitive element 11 is disposed in the magnetic field portion including the magnetic flux vector inclined with respect to the transport direction X1 in the bias magnetic field 4, the first magnetosensitive element 11 is along the transport direction X1 of the magnetic flux vector. Only detected components are detected.
- the bias magnetic field 4 (magnetic flux vector) passing through the first magnetosensitive element 11 is directed in the magnetosensitive direction F.
- Different signals are output from the first magnetosensitive element 11 when the bias magnetic field 4 (magnetic flux vector) passing through the first magnetosensitive element 11 is inclined. Therefore, if the bias magnetic field 4 (magnetic flux vector) is not uniform in the magnetic sensing direction F, there is a problem that the detection accuracy of the magnetic information of the magnetic pattern M is lowered.
- the downstream yoke 6 and the upstream yoke 7 are arranged on both sides of the long permanent magnet 5 between the permanent magnet 5 and the downstream in the transport direction X1.
- the side yoke 6 and the upstream yoke 7 extend in parallel to a direction orthogonal to the transport direction X1. Accordingly, the bias magnetic field 4 (magnetic flux vector) formed by the permanent magnet 5 so as to pass through the transport surface 2 is guided to the downstream yoke 6 and the upstream yoke 7, and the first magnetosensitive element 11 and the second magnetosensitive element. It becomes uniform in the transport direction X1, which is the magnetic sensing direction F of the element 12.
- the bias magnetic field 4 (magnetic flux vector) passing through the first magnetosensitive element 11 does not tilt with respect to the transport direction X1 regardless of the position in the width direction Y, so that the magnetic information of the magnetic pattern M can be accurately obtained. It can be detected.
- the magnetic sensing elements 11 and 12 arranged at the end in the width direction Y are separated from the end of the permanent magnet 5 by a distance T of 1/2 or more of the height L in the vertical direction of the permanent magnet 5. ing. Therefore, the bias magnetic field 4 (magnetic flux vector) passing through the magnetosensitive elements 11 and 12 disposed at the end in the width direction Y can also be oriented in the magnetosensitive direction F.
- the bias magnetic field 4 generated by the permanent magnet 5 is unnecessarily spread by the downstream side YUK and the upstream side yoke 7 arranged on both sides of the permanent magnet 5. Accordingly, it is possible to prevent the first magnetic sensing element 11 and the second magnetic sensing element 12 from detecting a change in the magnetic field caused by the movement of a magnetic material different from the magnetic pattern M of the medium 3. Further, by providing the downstream side YUK and the upstream side yoke 7 disposed on both sides of the permanent magnet 5, the first magnetic sensing element 11 and the second magnetic sensing element 12 are affected by the magnetic field outside the sensor unit 1. It can be prevented or suppressed.
- FIG. 8A is an explanatory diagram of the sensor unit of the first modification
- FIG. 8B is an explanatory diagram of the sensor unit of the second modification.
- the sensor unit 1A of the first modification includes a first magnetosensitive element 11, a second magnetosensitive element 12, and a third magnetosensitive element 13 as magnetosensitive elements.
- the third magnetosensitive element 13 is disposed at a third position E facing the upstream yoke 7 in the orthogonal direction Z orthogonal to the transport surface 2 and not facing the permanent magnet 5.
- the third position E is only in a range where the resistance value of the third magnetosensitive element 13 arranged at the third position E when the medium 3 passes through the second magnetosensitive element 12 along the transport surface 2 is extremely small. It can be set to a position where the signal output from the third magneto-sensitive element 13 becomes substantially zero corresponding to the variation of the resistance value without changing.
- the third magnetosensitive element 13 is magnetized by the permanent magnet 5.
- the residual magnetic flux density of M is detected.
- the third magnetosensitive element 13 does not detect a change in the bias magnetic field 4 due to the magnetic permeability of the magnetic pattern M. Accordingly, when the medium 3 is transported in the reverse transport direction X2, whether the magnetic pattern M is formed from a hard material or a soft material based on a signal from the third magnetosensitive element 13 is determined. Can be determined.
- the magnetic information of the magnetic pattern M made of a hard material can be acquired based on the signal from the second magnetosensitive element 12 and the signal from the third magnetosensitive element 13, and based on the signal from the second magnetosensitive element 12.
- Magnetic information of the magnetic pattern M made of a soft material can be acquired.
- the sensor unit 1 ⁇ / b> B of Modification 2 includes a second permanent magnet 15 on the downstream side of the downstream yoke 6 in the transport direction X ⁇ b> 1.
- the upstream yoke 7 is omitted.
- the second permanent magnet 15 applies the second bias magnetic field 16 to the medium 3.
- the first position A changes only within a very small range of the resistance value of the first magnetosensitive element 11 disposed at the first position A when the medium 3 passes the position facing the permanent magnet 5.
- the signal output corresponding to the variation of the resistance value is substantially zero.
- the first position A has a very small resistance value of the first magnetosensitive element 11 disposed at the first position A when the medium 3 passes the position facing the second permanent magnet 15. It can be set to a position where the signal that changes only within a certain range and the signal output corresponding to the change in the resistance value becomes substantially zero.
- the first magnetosensitive element 11 when the medium 3 is transported in the reverse transport direction X2 passing through the second permanent magnet 15, the downstream yoke 6 and the permanent magnet 5 in this order, the first magnetosensitive element 11 is The residual magnetic flux density of the magnetic pattern M magnetized by the two permanent magnets 15 is detected. On the other hand, the first magnetosensitive element 11 does not detect a change in the bias magnetic field 16 due to the magnetic permeability of the magnetic pattern M. Therefore, when the medium 3 is transported in the reverse transport direction X2, whether the magnetic pattern M is formed of a hard material or a soft material based on a signal from the first magnetosensitive element 11 is determined. Can be determined.
- the magnetic information of the magnetic pattern M made of a hard material can be acquired based on the signal from the first magnetosensitive element 11 and the signal from the second magnetosensitive element 12, and based on the signal from the second magnetosensitive element 12.
- Magnetic information of the magnetic pattern M made of a soft material can be acquired.
- the upstream yoke 7 may be provided in the sensor unit 1B. Further, a second downstream yoke may be provided on the downstream side of the second permanent magnet 15 in the transport direction X1. If these yokes are provided, the bias magnetic fields 4 and 16 generated by the permanent magnets 5 and 15 are prevented from spreading more than necessary. Accordingly, it is possible to prevent the first magnetosensitive element 11, the second magnetosensitive element 12, and the third magnetosensitive element from detecting a change in the magnetic field caused by the movement of a magnetic material different from the magnetic pattern M. Moreover, it can prevent or suppress that the 1st magneto-sensitive element 11, the 2nd magneto-sensitive element 12, and the 3rd magneto-sensitive element 13 are influenced from the magnetic field outside the sensor part 1B.
- SYMBOLS 1 Sensor part, 2 ... Conveyance surface (moving surface), 3 ... Medium, 4 ... Bias magnetic field, 5 ... Permanent magnet, 6 ... Downstream side yoke, 7 ... Upstream side yoke, 11 ... 1st magnetoresistive element, 12 ... 2nd magnetic sensing element, 13 ... 3rd magnetic sensing element, 15 ... 2nd permanent magnet, 16 ... 2nd bias magnetic field, 20 ... Magnetic sensor apparatus, A ... 1st position, B ... 2nd position, E ... 3rd position, F ... Magnetosensitive direction, M ... Magnetic pattern, X1 ... Moving direction, Z ... Orthogonal direction
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Manufacturing & Machinery (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Theoretical Computer Science (AREA)
- Measuring Magnetic Variables (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
A magnetic sensor device which is capable of determining whether a magnetic pattern applied to a medium is a hard magnetic material or a soft magnetic material is provided. Specifically, the magnetic sensor device 20 is provided with a sensor unit 1 for detecting a magnetic pattern M on a medium 3 conveyed along a conveyance surface 2. The sensor unit 1 is equipped with a permanent magnet 5 for applying a bias magnetic field 4, a downstream-side yoke 6 disposed on the downstream side of the permanent magnet 5, a first magnetic sensitive element 11 disposed in a first position A which is opposite the downstream-side yoke 6 but not opposite the permanent magnet 5 in a perpendicular direction Z perpendicularly intersecting the conveyance surface 2, and a second magnetic sensitive element 12 disposed in a second position B which is opposite the permanent magnet 5 in the perpendicular direction Z. The first magnetic sensitive element 11 only detects changes in the bias magnetic field 4 attributable to the residual magnetic flux density of the magnetic pattern M (hard magnetic material), and thus it is possible to determine whether the magnetic pattern M applied to the medium 3 is a hard magnetic material or a soft magnetic material.
Description
本発明は、磁気パターンを検出する磁気センサ装置に関するものである。
The present invention relates to a magnetic sensor device for detecting a magnetic pattern.
磁気インクによって磁性パターンが付与された紙幣等の媒体の種類や真偽を判定する際には、バイアス磁界を発生させる磁石と磁気抵抗素子等の感磁素子を備える磁気センサ装置が用いられる。感磁素子は磁性パターンが磁気センサ装置の検出位置を通過する際の磁界の変化を検出して、自己の抵抗値の変化に対応する信号を出力する。かかる磁気センサ装置は特許文献1に記載されている。
When determining the type and authenticity of a medium such as a banknote to which a magnetic pattern is applied by magnetic ink, a magnetic sensor device including a magnet that generates a bias magnetic field and a magnetosensitive element such as a magnetoresistive element is used. The magnetosensitive element detects a change in the magnetic field when the magnetic pattern passes through the detection position of the magnetic sensor device, and outputs a signal corresponding to the change in its resistance value. Such a magnetic sensor device is described in Patent Document 1.
特許文献1に記載の技術では、磁気パターンがフェライト粉等のハード材を含む磁気インクで印刷されているか、軟磁性ステンレス粉等のソフト材(軟磁性材料(soft magnetic material))を含む磁気インクで印刷されているかを判別できないという問題がある。
In the technique described in Patent Document 1, the magnetic pattern is printed with a magnetic ink containing a hard material such as ferrite powder, or a magnetic ink containing a soft material (soft magnetic material) such as a soft magnetic stainless steel powder. There is a problem that it is not possible to determine whether or not printing is performed.
すなわち、上記のいずれの磁気インクを用いて磁気パターンを形成した場合でも、磁気パターンは透磁率を有するので、感磁素子は透磁率に起因する磁界の変化を検出する。一方、磁気パターンがハード材を含む磁気インクで印刷されている場合には、感磁素子は残留磁束密度に起因する磁界の変化を検出することになるが、残留磁束密度に起因する磁界の変化は透磁率に起因する磁界の変化に重畳されて検出されるので、残留磁束密度に由来する信号成分を切り分けることができない。従って、磁気パターンがハード材を含む磁気インクで印刷されているか、ソフト材を含む磁気インクで印刷されているかを判別できない。
That is, even when any of the above magnetic inks is used to form a magnetic pattern, the magnetic pattern has a magnetic permeability, so that the magnetosensitive element detects a change in the magnetic field caused by the magnetic permeability. On the other hand, when the magnetic pattern is printed with magnetic ink containing a hard material, the magnetosensitive element detects a change in the magnetic field due to the residual magnetic flux density, but the change in the magnetic field due to the residual magnetic flux density. Is detected by being superimposed on the change in the magnetic field due to the magnetic permeability, so that the signal component derived from the residual magnetic flux density cannot be separated. Therefore, it cannot be determined whether the magnetic pattern is printed with magnetic ink containing hard material or magnetic ink containing soft material.
以上の問題に鑑みて、本発明の課題は、媒体に付与された磁気パターンがハード材およびソフト材のいずれかを判別できる磁気センサ装置を提供することにある。
In view of the above problems, an object of the present invention is to provide a magnetic sensor device capable of discriminating either a hard material or a soft material from a magnetic pattern applied to a medium.
上記課題を解決するために、本発明は、移動面に沿って相対移動する媒体に付与された磁気パターンを感磁素子により検出する磁気センサ装置において、前記媒体にバイアス磁界を印加する磁石と、前記媒体の移動方向で前記磁石の下流側に配置された下流側ヨークと、を有し、前記感磁素子として、前記移動面と直交する直交方向で前記下流側ヨークと対向して前記磁石とは対向しない第1位置に配置された第1感磁素子と、前記直交方向で前記磁石と対向する第2位置に配置された第2感磁素子と、を備えることを特徴とする。
In order to solve the above problems, the present invention provides a magnetic sensor device for detecting a magnetic pattern applied to a medium that moves relative to a moving surface by a magnetosensitive element, a magnet that applies a bias magnetic field to the medium, A downstream yoke disposed on the downstream side of the magnet in the moving direction of the medium, and as the magnetosensitive element, the magnet facing the downstream yoke in an orthogonal direction perpendicular to the moving surface, Comprises a first magnetosensitive element disposed at a first position that does not oppose, and a second magnetosensitive element disposed at a second position that opposes the magnet in the orthogonal direction.
本発明によれば、第2感磁素子はバイアス磁界を印加する磁石と対向する第2位置に配置されている。従って、媒体が移動面に沿って第2位置を通過したときに第2感磁素子により磁気パターンの透磁率に起因する磁界の変化を検出できる。一方、第1感磁素子はバイアス磁界を印加する磁石の下流側に配置したヨークと対向する第1位置に配置されている。ここで、第1位置は磁石と対向する領域から離間する領域にあるので、媒体が移動面に沿って第2位置を通過したときに磁界の向きの変化が少なく、かつ、磁束密度が小さい。従って、媒体が移動面に沿って第2位置を通過したときに、第1位置に配置された第1感磁素子から出力される信号成分について、透磁率に由来する信号成分の出力を実質的にゼロとすることができる。また、第1位置は媒体の移動方向における磁石の下流側で磁石と対向する領域から離間する領域にあるので、第1位置に配置された第1感磁素子は磁気パターンの残留磁束密度に起因する磁界の変化を検出できる。従って、第1感磁素子から出力される信号に基づいて、媒体に付与された磁気パターンがハード材およびソフト材のいずれかを判別できる。
According to the present invention, the second magnetosensitive element is disposed at the second position facing the magnet to which the bias magnetic field is applied. Therefore, when the medium passes through the second position along the moving surface, the change in the magnetic field due to the magnetic permeability of the magnetic pattern can be detected by the second magnetosensitive element. On the other hand, the first magnetosensitive element is disposed at a first position facing a yoke disposed downstream of the magnet to which the bias magnetic field is applied. Here, since the first position is in a region separated from the region facing the magnet, the change in the direction of the magnetic field is small and the magnetic flux density is small when the medium passes through the second position along the moving surface. Therefore, when the medium passes through the second position along the moving surface, the signal component output from the first magnetosensitive element arranged at the first position is substantially output from the magnetic permeability. Can be zero. In addition, since the first position is in a region away from the region facing the magnet on the downstream side of the magnet in the moving direction of the medium, the first magnetosensitive element arranged in the first position is caused by the residual magnetic flux density of the magnetic pattern. The change of the magnetic field can be detected. Therefore, based on the signal output from the first magnetosensitive element, it is possible to determine whether the magnetic pattern applied to the medium is a hard material or a soft material.
本発明において、前記第1位置および前記第2位置は、前記磁石から前記移動面を経由して前記下流側ヨークに至る前記バイアス磁界内にあるものとすることができる。
In the present invention, the first position and the second position may be in the bias magnetic field from the magnet to the downstream yoke via the moving surface.
本発明において、前記第1感磁素子は、感磁方向を前記移動方向に向けていることが望ましい。このようにすれば、第1感磁素子は磁界の向きの変化の移動方向の成分を検出するものとなる。これにより、第1感磁素子から出力される信号について、透磁率に由来する信号成分の出力を実質的にゼロとすることが容易となる。
In the present invention, it is desirable that the first magnetosensitive element has a magnetosensitive direction in the moving direction. In this way, the first magnetosensitive element detects the moving direction component of the change in the direction of the magnetic field. Thereby, it becomes easy to make the output of the signal component derived from the magnetic permeability substantially zero for the signal output from the first magnetosensitive element.
ここで、感磁素子としては、MR素子を用いることができる。
Here, an MR element can be used as the magnetosensitive element.
本発明において、前記移動方向で前記磁石の上流側に配置された上流側ヨークを有することが望ましい。このようにすれば、下流側ユークと上流側ヨークによって磁石が発生させる磁界が必要以上に広がることを抑制できる。従って、感磁素子が媒体とは異なる磁性体の動きに起因する磁界の変化を検出することを防止できる。また、このようにすれば、装置の外部の磁界に対して、感磁素子が影響を受けることを防止或いは抑制できる。
In the present invention, it is desirable to have an upstream yoke disposed on the upstream side of the magnet in the moving direction. If it does in this way, it can control that the magnetic field which a magnet generates by downstream Yuku and an upstream yoke spreads more than necessary. Therefore, it is possible to prevent the magnetic sensing element from detecting a change in the magnetic field due to the movement of the magnetic material different from the medium. In this way, it is possible to prevent or suppress the magnetosensitive element from being affected by the magnetic field outside the apparatus.
本発明において、前記磁石における移動面側の端面、および、前記下流側ヨークにおける移動面側の端面、および、前記上流側ヨークにおける移動面側の端面は、同一平面上に位置しており、前記移動面と平行に延びていることが望ましい。
In the present invention, the end surface on the moving surface side in the magnet, the end surface on the moving surface side in the downstream yoke, and the end surface on the moving surface side in the upstream yoke are located on the same plane, It is desirable to extend parallel to the moving surface.
この場合において、前記感磁素子として、前記移動面と直交する直交方向で前記上流側ヨークと対向して前記磁石とは対向しない第3位置に配置された第3感磁素子を備えるものとすることができる。このようにすれば、相対移動方向を反対とした場合に、第3位置に配置された第3感磁素子によって、磁気パターン(ハード材)の残留磁束密度に起因する磁界の変化を検出できる。すなわち、装置に対する媒体の相対移動方向を反対とした場合には、媒体は移動面に沿って磁石と対向する位置を通過した後に第3位置を通過する。従って、媒体にハード材からなる磁気パターンが付与されている場合には、媒体が第3位置を通過する際にこのハード材が着磁されている。よって、第3感磁素子により磁気パターン(ハード材)の残留磁束密度に起因する磁界の変化を検出できる。
In this case, the magnetosensitive element includes a third magnetosensitive element disposed at a third position facing the upstream yoke in a direction orthogonal to the moving surface and not facing the magnet. be able to. In this case, when the relative movement direction is reversed, the change in the magnetic field caused by the residual magnetic flux density of the magnetic pattern (hard material) can be detected by the third magnetosensitive element arranged at the third position. That is, when the relative movement direction of the medium with respect to the apparatus is reversed, the medium passes through the third position after passing through the position facing the magnet along the moving surface. Therefore, when a magnetic pattern made of a hard material is applied to the medium, the hard material is magnetized when the medium passes through the third position. Therefore, a change in the magnetic field due to the residual magnetic flux density of the magnetic pattern (hard material) can be detected by the third magnetosensitive element.
本発明において、前記媒体に第2のバイアス磁界を印加する第2の磁石を有し、前記第2の磁石は、前記移動方向で前記下流側ヨークの下流側に位置するものとすることができる。このようにすれば、装置に対する媒体の相対移動方向を反対とした場合に、第1位置に配置された第1感磁素子によって、磁気パターン(ハード材)の残留磁束密度に起因する磁界の変化を検出できる。すなわち、媒体の相対移動方向を反対とした場合には、媒体は移動面に沿って第2の磁石と対向する位置を通過した後に第1位置を通過する。従って、媒体にハード材からなる磁気パターンが付与されている場合には、媒体が第1位置を通過する際にこのハード材が着磁されている。よって、第1感磁素子により磁気パターン(ハード材)の残留磁束密度に起因する磁界の変化を検出できる。
In this invention, it has a 2nd magnet which applies a 2nd bias magnetic field to the said medium, and the said 2nd magnet shall be located in the downstream of the said downstream yoke in the said moving direction. . In this way, when the relative movement direction of the medium with respect to the apparatus is reversed, the change of the magnetic field caused by the residual magnetic flux density of the magnetic pattern (hard material) is caused by the first magnetosensitive element arranged at the first position. Can be detected. That is, when the relative movement direction of the medium is reversed, the medium passes through the first position after passing through the position facing the second magnet along the moving surface. Therefore, when a magnetic pattern made of a hard material is applied to the medium, the hard material is magnetized when the medium passes through the first position. Therefore, a change in the magnetic field due to the residual magnetic flux density of the magnetic pattern (hard material) can be detected by the first magnetosensitive element.
本発明において、前記第1感磁素子および前記第2感磁素子は、それぞれ前記移動方向と交差して前記移動面に沿った方向に複数配列されており、前記磁石は、複数の前記第2感磁素子の配列方向に延びて各第2感磁素子と対向することが望ましい。このようにすれば、媒体の幅方向に延びる広い範囲で磁気パターンを検出できる。また、磁石として、第1感磁素子の配列方向に延びる長尺状の1本の磁石を用いるので、第1感磁素子と対応する数の複数の磁石を第1感磁素子の配列方向に配列する場合と比較して、搬送面を経由して形成される磁石の磁界を所定の方向に沿った均一なものとすることが容易である。従って、配列方向における第1感磁素子の位置に起因して、第1感磁素子からの出力に差異が発生することを防止或いは抑制できる。
In the present invention, a plurality of the first magnetosensitive elements and the second magnetosensitive elements are respectively arranged in a direction along the moving surface so as to intersect the moving direction, and the magnet includes a plurality of the second magnetosensitive elements. It is desirable to extend in the arrangement direction of the magnetosensitive elements and to face each second magnetosensitive element. In this way, the magnetic pattern can be detected in a wide range extending in the width direction of the medium. Further, since one long magnet extending in the arrangement direction of the first magnetosensitive elements is used as the magnet, a plurality of magnets corresponding to the first magnetosensitive elements are arranged in the arrangement direction of the first magnetosensitive elements. Compared to the arrangement, it is easy to make the magnetic field of the magnet formed via the transport surface uniform along a predetermined direction. Therefore, it is possible to prevent or suppress the occurrence of a difference in the output from the first magnetosensitive element due to the position of the first magnetosensitive element in the arrangement direction.
本発明において、前記下流側ヨークは、前記磁石に沿って延びて各第1感磁素子と対向することが望ましい。磁石が発生させる磁界は下流側ヨークに導かれるので、このようにすれば、搬送面を経由するように形成される磁石の磁界を各感磁素子の感磁方向に沿った均一なものとすることができる。これにより、配列方向における第1感磁素子の位置に起因して、第1感磁素子からの出力に差異が発生することを防止或いは抑制できる。
In the present invention, it is preferable that the downstream yoke extends along the magnet and opposes each first magnetosensitive element. Since the magnetic field generated by the magnet is guided to the downstream yoke, in this way, the magnetic field of the magnet formed so as to pass through the transport surface is made uniform along the magnetic sensing direction of each magnetic sensing element. be able to. As a result, it is possible to prevent or suppress the occurrence of a difference in the output from the first magnetosensitive element due to the position of the first magnetosensitive element in the arrangement direction.
本発明において、前記媒体の移動方向と直交する搬送経路の幅方向の前記第1感磁素子および前記第2感磁素子は、前記磁石の端からの距離が前記磁石の前記媒体の移動方向および前記搬送経路の幅方向と直交する高さ寸法の1/2以上離間していることが望ましい。
In the present invention, the first magnetic sensitive element and the second magnetic sensitive element in the width direction of the transport path orthogonal to the moving direction of the medium are such that the distance from the end of the magnet is the moving direction of the medium of the magnet and It is desirable that they are separated by 1/2 or more of the height dimension orthogonal to the width direction of the transport path.
本発明では、第1感磁素子から出力される信号に基づいて、媒体に付与された磁気パターンがハード材かソフト材かを判別できる。
In the present invention, it is possible to determine whether the magnetic pattern applied to the medium is a hard material or a soft material based on a signal output from the first magnetosensitive element.
以下に、図面を参照して、本発明を適用した磁気センサ装置を説明する。
Hereinafter, a magnetic sensor device to which the present invention is applied will be described with reference to the drawings.
(全体構成)
図1は本発明を適用した磁気センサ装置の要部構成を模式的に示す説明図である。本発明の磁気センサ装置20は、搬送経路21(搬送面2)に沿って搬送される紙幣などのシート状の媒体3に付与された磁気パターンMを感磁素子11、12により検出する。 (overall structure)
FIG. 1 is an explanatory view schematically showing a main part configuration of a magnetic sensor device to which the present invention is applied. Themagnetic sensor device 20 of the present invention detects the magnetic pattern M applied to the sheet-like medium 3 such as banknotes conveyed along the conveyance path 21 (conveying surface 2) by the magnetic sensitive elements 11 and 12.
図1は本発明を適用した磁気センサ装置の要部構成を模式的に示す説明図である。本発明の磁気センサ装置20は、搬送経路21(搬送面2)に沿って搬送される紙幣などのシート状の媒体3に付与された磁気パターンMを感磁素子11、12により検出する。 (overall structure)
FIG. 1 is an explanatory view schematically showing a main part configuration of a magnetic sensor device to which the present invention is applied. The
磁気センサ装置20が検出する磁気パターンMとしては、ハード材を含む磁気インキにより印刷されたものと、ソフト材を含む磁気インキにより印刷されたものがある。ハード材とは、マグネットに用いる磁性材料のように、外部より磁界を印加すると、ヒステリシスが大きくて残留磁束密度が高く、容易に磁化される磁性材料である。ソフト材とは、モータや磁気ヘッドのコア材のように、ヒステリシスが小さくて残留磁束密度が低く、容易に磁化されない磁性材料である。
The magnetic pattern M detected by the magnetic sensor device 20 includes one printed with magnetic ink containing a hard material and one printed with magnetic ink containing a soft material. The hard material is a magnetic material that is easily magnetized when applied with a magnetic field from the outside, such as a magnetic material used in a magnet, having a large hysteresis and a high residual magnetic flux density. The soft material is a magnetic material that has a small hysteresis, a low residual magnetic flux density, and is not easily magnetized, like a core material of a motor or a magnetic head.
図1に示すように、磁気センサ装置20は、センサ部1と、センサ部1による検出位置を経由する搬送経路21に沿って媒体3を搬送する搬送機構22を備える。搬送機構22は搬送ローラ23と搬送ローラ23の駆動源となる搬送モータ24を備える。
As shown in FIG. 1, the magnetic sensor device 20 includes a sensor unit 1 and a transport mechanism 22 that transports the medium 3 along a transport path 21 that passes through a detection position by the sensor unit 1. The transport mechanism 22 includes a transport roller 23 and a transport motor 24 serving as a drive source for the transport roller 23.
センサ部1は媒体3の搬送方向X1と直交する搬送経路21の幅方向Yに延びる。搬送ローラ23はセンサ部1と移動面である搬送面2と直交する直交方向Zで対向して配置されている。センサ部1は非磁性のケース25に収容されている。ケース25において搬送ローラ23と対向する対向面は、磁気センサ装置20による磁気パターンMの検出位置を規定するとともに、搬送経路21における搬送面2の一部分を構成する。
The sensor unit 1 extends in the width direction Y of the transport path 21 orthogonal to the transport direction X1 of the medium 3. The conveyance roller 23 is disposed to face the sensor unit 1 in the orthogonal direction Z orthogonal to the conveyance surface 2 that is a moving surface. The sensor unit 1 is accommodated in a nonmagnetic case 25. In the case 25, the facing surface facing the transport roller 23 defines the detection position of the magnetic pattern M by the magnetic sensor device 20 and constitutes a part of the transport surface 2 in the transport path 21.
センサ部1は、第1感磁素子11と第2感磁素子12が形成された複数のMR基板26を備える。MR基板26は、搬送面2に沿って幅方向Yに配列されている。従って、センサ部1は、幅方向Yに配列された複数の第1感磁素子11と、幅方向Yに配列された複数の第2感磁素子12を備える。第2感磁素子12は第1感磁素子11に対して搬送方向X1の上流側に配置されている。
The sensor unit 1 includes a plurality of MR substrates 26 on which the first magnetosensitive element 11 and the second magnetosensitive element 12 are formed. The MR substrate 26 is arranged in the width direction Y along the transport surface 2. Therefore, the sensor unit 1 includes a plurality of first magnetosensitive elements 11 arranged in the width direction Y and a plurality of second magnetosensitive elements 12 arranged in the width direction Y. The second magnetosensitive element 12 is disposed upstream of the first magnetosensitive element 11 in the transport direction X1.
また、センサ部1は、永久磁石5と、媒体3の搬送方向X1で永久磁石5の下流側に配置された下流側ヨーク6と、永久磁石5の上流側に配置された上流側ヨーク7を有する。永久磁石5は、搬送面2を搬送される媒体3、第1感磁素子11および第2感磁素子12にバイアス磁界4を印加する。搬送面2は、第1感磁素子11および第2感磁素子12を間に挟んで永久磁石5、下流側ヨーク6および上流側ヨーク7と反対側(直交方向Z側)に配置されている。
The sensor unit 1 includes a permanent magnet 5, a downstream yoke 6 disposed on the downstream side of the permanent magnet 5 in the conveyance direction X <b> 1 of the medium 3, and an upstream yoke 7 disposed on the upstream side of the permanent magnet 5. Have. The permanent magnet 5 applies a bias magnetic field 4 to the medium 3, the first magnetosensitive element 11 and the second magnetosensitive element 12 conveyed on the conveyance surface 2. The transport surface 2 is disposed on the opposite side (orthogonal direction Z side) of the permanent magnet 5, the downstream yoke 6 and the upstream yoke 7 with the first and second magnetosensitive elements 11 and 12 interposed therebetween. .
永久磁石5は長尺状であり直方体形状をしている。永久磁石5は幅方向Y(複数の第1感磁素子11の配列方向)に一定幅で延びる。永久磁石5は各第2感磁素子12と対向する。下流側ヨーク6は永久磁石5の下流側の端面に当接して永久磁石5に沿って幅方向Yに一定幅で延びる。下流側ヨーク6は各第1感磁素子11と対向する。
The permanent magnet 5 is long and has a rectangular parallelepiped shape. The permanent magnet 5 extends with a constant width in the width direction Y (the arrangement direction of the plurality of first magnetosensitive elements 11). The permanent magnet 5 faces each second magnetosensitive element 12. The downstream yoke 6 abuts against the downstream end surface of the permanent magnet 5 and extends along the permanent magnet 5 with a constant width in the width direction Y. The downstream yoke 6 faces each first magnetosensitive element 11.
上流側ヨーク7は永久磁石5の上流側の端面に当接して永久磁石5に沿って幅方向Yに一定幅で延びる。下流側ヨーク6および上流側ヨーク7はそれぞれ長尺状であり直方体形状をしている。永久磁石5、下流側ヨーク6および上流側ヨーク7の幅方向Yにおける寸法は同一である。
The upstream yoke 7 is in contact with the upstream end surface of the permanent magnet 5 and extends along the permanent magnet 5 with a constant width in the width direction Y. The downstream yoke 6 and the upstream yoke 7 are each elongated and have a rectangular parallelepiped shape. The dimensions in the width direction Y of the permanent magnet 5, the downstream yoke 6 and the upstream yoke 7 are the same.
ここで、幅方向Yの両端部分に位置する第1感磁素子11、第2感磁素子12は、永久磁石5の端部5aから規定の距離T以上離間する位置に配置される。規定の距離Tとは、永久磁石5の上下方向における高さ寸法Lの1/2である。
Here, the first magnetosensitive element 11 and the second magnetosensitive element 12 positioned at both end portions in the width direction Y are disposed at positions spaced from the end portion 5a of the permanent magnet 5 by a predetermined distance T or more. The specified distance T is ½ of the height dimension L in the vertical direction of the permanent magnet 5.
(センサ部)
図2は本発明の磁気センサ装置20のセンサ部1における永久磁石5と感磁素子11、12の配置の説明図である。図3(a)は第1感磁素子11の抵抗値-磁束密度特性曲線のグラフであり、図3(b)は第2感磁素子12の抵抗値-磁束密度特性曲線のグラフである。図2では、図1とは逆に、図面に向かって感磁素子11、12の上方に永久磁石5を示し、図面に向かって感磁素子11、12の下方に搬送面2を示す。 (Sensor part)
FIG. 2 is an explanatory view of the arrangement of thepermanent magnet 5 and the magnetic sensitive elements 11 and 12 in the sensor unit 1 of the magnetic sensor device 20 of the present invention. 3A is a graph of the resistance value-magnetic flux density characteristic curve of the first magnetosensitive element 11, and FIG. 3B is a graph of the resistance value-magnetic flux density characteristic curve of the second magnetosensitive element 12. FIG. In FIG. 2, contrary to FIG. 1, the permanent magnet 5 is shown above the magnetic sensing elements 11 and 12 toward the drawing, and the conveying surface 2 is shown below the magnetic sensing elements 11 and 12 toward the drawing.
図2は本発明の磁気センサ装置20のセンサ部1における永久磁石5と感磁素子11、12の配置の説明図である。図3(a)は第1感磁素子11の抵抗値-磁束密度特性曲線のグラフであり、図3(b)は第2感磁素子12の抵抗値-磁束密度特性曲線のグラフである。図2では、図1とは逆に、図面に向かって感磁素子11、12の上方に永久磁石5を示し、図面に向かって感磁素子11、12の下方に搬送面2を示す。 (Sensor part)
FIG. 2 is an explanatory view of the arrangement of the
永久磁石5は、搬送面2に対して直交する方向に着磁されている。本例では、永久磁石5は搬送面2の側にN極を向けている。下流側ヨーク6は下流側から永久磁石5に当接し、上流側ヨーク7は上流側から永久磁石5に当接する。永久磁石5における搬送面2の側の端面と下流側ヨーク6および上流側ヨーク7における搬送面2の側の端面は同一平面上に位置し、搬送面2と平行に延びる。
The permanent magnet 5 is magnetized in a direction perpendicular to the transport surface 2. In this example, the permanent magnet 5 has the N pole facing the transport surface 2 side. The downstream yoke 6 contacts the permanent magnet 5 from the downstream side, and the upstream yoke 7 contacts the permanent magnet 5 from the upstream side. The end surface of the permanent magnet 5 on the side of the conveyance surface 2 and the end surface of the downstream yoke 6 and the upstream yoke 7 on the side of the conveyance surface 2 are located on the same plane and extend in parallel with the conveyance surface 2.
第1感磁素子11および第2感磁素子12は、いずれも磁気抵抗素子である。より具体的には、薄膜強磁性金属からなる磁気抵抗パターンを備えた異方性磁気抵抗素子(AMR(Anisotropic-Magneto-Resistance))である。異方性磁気抵抗素子は、その磁気抵抗パターンに電流を流した際に、電流方向に対して垂直方向からバイアス磁界4が印加されたとき、磁界の強さに応じて抵抗値が低下する。第1感磁素子11および第2感磁素子12の感磁方向Fは搬送方向X1であり、第1感磁素子11および第2感磁素子12は搬送方向X1における磁束ベクトルの変化を検出する。
The first magnetosensitive element 11 and the second magnetosensitive element 12 are both magnetoresistive elements. More specifically, it is an anisotropic magnetoresistive element (AMR (Anisotropic-Magneto-Resistance)) having a magnetoresistive pattern made of a thin film ferromagnetic metal. When a bias magnetic field 4 is applied from a direction perpendicular to the current direction when a current is passed through the magnetoresistive pattern of the anisotropic magnetoresistive element, the resistance value decreases according to the strength of the magnetic field. The magnetosensitive direction F of the first magnetosensitive element 11 and the second magnetosensitive element 12 is the conveyance direction X1, and the first magnetosensitive element 11 and the second magnetosensitive element 12 detect a change in the magnetic flux vector in the conveyance direction X1. .
第1感磁素子11は、搬送面2と直交する直交方向Zで下流側ヨーク6と対向して永久磁石5とは対向しない第1位置Aに配置されている。第2感磁素子12は、直交方向Zで永久磁石5と対向する第2位置Bに配置されている。第2位置Bは第1位置Aよりも搬送方向X1の上流側である。第1位置Aおよび第2位置Bは、永久磁石5から搬送面2を経由して下流側ヨーク6に至るバイアス磁界4内にある。下流側ヨーク6における搬送面2の側の端面と第1感磁素子11の間の距離は、永久磁石5における搬送面2の側の端面と第2感磁素子12の間の距離と同一である。
The first magnetosensitive element 11 is disposed at a first position A that faces the downstream yoke 6 and does not face the permanent magnet 5 in the orthogonal direction Z perpendicular to the transport surface 2. The second magnetosensitive element 12 is disposed at the second position B facing the permanent magnet 5 in the orthogonal direction Z. The second position B is upstream of the first position A in the transport direction X1. The first position A and the second position B are in the bias magnetic field 4 from the permanent magnet 5 to the downstream yoke 6 via the transport surface 2. The distance between the end surface of the downstream yoke 6 on the transport surface 2 side and the first magnetosensitive element 11 is the same as the distance between the end surface of the permanent magnet 5 on the transport surface 2 side and the second magnetosensitive element 12. is there.
第1位置Aは、第1感磁素子11の抵抗値-磁束密度特性において、磁束密度の変化に対して抵抗値の変化が大きくなるようなバイアス磁界4(第1磁束ベクトルHa0)が印加される位置である。換言すれば、第1位置Aは、第1感磁素子11を配置したときに、その抵抗値R1が図3(a)の抵抗値-磁束密度特性曲線における傾きの急な曲線部分にプロットされる位置である。第2位置Bは、第2感磁素子12の抵抗値-磁束密度特性において、磁束密度の変化に対して抵抗値の変化が大きくなるようなバイアス磁界4(第2磁束ベクトルHb0)が印加される位置である。換言すれば、第2位置Bは、第2感磁素子12を配置したときに、その抵抗値R2が図3(b)の抵抗値-磁束密度特性曲線における傾きが急な曲線部分にプロットされる位置である。
At the first position A, a bias magnetic field 4 (first magnetic flux vector Ha0) is applied so that the change in resistance value increases with respect to the change in magnetic flux density in the resistance value-magnetic flux density characteristics of the first magnetosensitive element 11. It is a position. In other words, at the first position A, when the first magnetosensitive element 11 is disposed, the resistance value R1 is plotted on the steep curve portion of the resistance value-magnetic flux density characteristic curve of FIG. It is a position. At the second position B, a bias magnetic field 4 (second magnetic flux vector Hb0) is applied so that the change in resistance value increases with respect to the change in magnetic flux density in the resistance value-magnetic flux density characteristics of the second magnetosensitive element 12. It is a position. In other words, at the second position B, when the second magnetosensitive element 12 is arranged, the resistance value R2 is plotted in a curve portion having a steep slope in the resistance value-magnetic flux density characteristic curve of FIG. It is a position.
図2に示すように、本例では、第1位置Aにおける第1磁束ベクトルHa0は下流側に向かって下流側ヨーク6に向かう方向に傾斜する。第2位置Bにおける第2磁束ベクトルHb0は下流側に向かって永久磁石5から離間する方向に傾斜する。直交方向Zに対する第1磁束ベクトルHa0の傾斜は、直交方向Zに対する第2磁束ベクトルHb0の傾斜よりも大きい。
2, in this example, the first magnetic flux vector Ha0 at the first position A is inclined in the direction toward the downstream yoke 6 toward the downstream side. The second magnetic flux vector Hb0 at the second position B is inclined in the direction away from the permanent magnet 5 toward the downstream side. The inclination of the first magnetic flux vector Ha0 with respect to the orthogonal direction Z is larger than the inclination of the second magnetic flux vector Hb0 with respect to the orthogonal direction Z.
なお、第1感磁素子11および第2感磁素子12としては、半導体磁気抵抗素子、ホール素子、MI素子(Magneto-Impedance element)、フラックスゲート型の磁気センサなどを用いてもよい。また、第1感磁素子11は、搬送面2を間に挟んで下流側ヨーク6と反対側に配置してもよい。同様に、第2感磁素子12は搬送面2を間に挟んで永久磁石5と反対側に配置してもよい。さらに、第1感磁素子11と第2感磁素子12が搬送面2を間に挟んだ反対側に配置されていてもよい。
As the first magnetosensitive element 11 and the second magnetosensitive element 12, a semiconductor magnetoresistive element, a Hall element, an MI element (Magneto-Impedance element), a fluxgate type magnetic sensor, or the like may be used. Further, the first magnetosensitive element 11 may be disposed on the opposite side of the downstream yoke 6 with the transport surface 2 interposed therebetween. Similarly, the second magnetosensitive element 12 may be disposed on the opposite side of the permanent magnet 5 with the transport surface 2 interposed therebetween. Furthermore, the 1st magnetosensitive element 11 and the 2nd magnetosensitive element 12 may be arrange | positioned on the opposite side on both sides of the conveyance surface 2.
また、第2位置Bは、第2感磁素子12の少なくとも一部分が直交方向Zで永久磁石5と対向する位置とすることができる。さらに、下流側ヨーク6における搬送面2の側の端面と第1感磁素子11の間の距離は、永久磁石5における搬送面2の側の端面と第2感磁素子12の間の距離と相違していてもよい。また、上流側ヨーク7は省略してもよい。永久磁石はS極を搬送面2の側に向けて配置してもよい。
Also, the second position B can be a position where at least a part of the second magnetosensitive element 12 faces the permanent magnet 5 in the orthogonal direction Z. Further, the distance between the end face of the downstream yoke 6 on the transport surface 2 side and the first magnetosensitive element 11 is the distance between the end face of the permanent magnet 5 on the transport surface 2 side and the second magnetosensitive element 12. It may be different. Further, the upstream yoke 7 may be omitted. The permanent magnet may be arranged with the south pole facing the transport surface 2 side.
(動作原理)
図4はセンサ部1を部分的に拡大して示す模式図である。図5は磁気パターンMが搬送面2を移動する際の磁束ベクトルHa0、Hb0の変化の説明図である。図6はハード材を含む磁気パターンMが搬送面2を移動する際の磁界の変化の説明図である。図4から図6では、磁束ベクトルHa0、Hb0の変化および磁界の変化を判り易く示すために媒体3を省略して媒体3に付与された磁気パターンMのみを示す。 (Operating principle)
FIG. 4 is a schematic diagram showing thesensor unit 1 partially enlarged. FIG. 5 is an explanatory diagram of changes in the magnetic flux vectors Ha 0 and Hb 0 when the magnetic pattern M moves on the transport surface 2. FIG. 6 is an explanatory diagram of changes in the magnetic field when the magnetic pattern M including the hard material moves on the transport surface 2. 4 to 6, only the magnetic pattern M applied to the medium 3 is shown with the medium 3 omitted in order to easily show the changes in the magnetic flux vectors Ha0 and Hb0 and the change in the magnetic field.
図4はセンサ部1を部分的に拡大して示す模式図である。図5は磁気パターンMが搬送面2を移動する際の磁束ベクトルHa0、Hb0の変化の説明図である。図6はハード材を含む磁気パターンMが搬送面2を移動する際の磁界の変化の説明図である。図4から図6では、磁束ベクトルHa0、Hb0の変化および磁界の変化を判り易く示すために媒体3を省略して媒体3に付与された磁気パターンMのみを示す。 (Operating principle)
FIG. 4 is a schematic diagram showing the
まず、媒体3に付与された磁気パターンMが搬送面2における第2位置Bと対向する上流側検出位置Cを通過する際には、バイアス磁界4は、磁気パターンMの透磁率に起因して、磁気パターンMに吸われるように磁束の方向が変化する。これにより、第2感磁素子12が配置された第2位置Bを通過する第2磁束ベクトルHb0は、その方向を搬送方向Xの前後に変化させる。
First, when the magnetic pattern M applied to the medium 3 passes through the upstream detection position C facing the second position B on the transport surface 2, the bias magnetic field 4 is caused by the magnetic permeability of the magnetic pattern M. The direction of the magnetic flux changes so as to be absorbed by the magnetic pattern M. As a result, the second magnetic flux vector Hb0 passing through the second position B where the second magnetosensitive element 12 is disposed changes its direction before and after the transport direction X.
より具体的には、第2磁束ベクトルHb0は、図5(a)に示すように、磁気パターンMに向かって法線(直交方向Z)に接近する方向に傾いた後に(磁束ベクトルHb1)、図5(b)に示すように、第1磁束ベクトルHb0よりも下流側に向って傾斜する(磁束ベクトルHb2)。ここで、図4に模式的に示すように、第2位置Bはバイアス磁界4を発生する永久磁石5と対向する位置なので、磁束密度は大きい(磁束ベクトルHb0は大きい)。従って、第2感磁素子12が検出する磁束ベクトルHb0の感磁方向Fの成分Hbfは大きく変化する。これにより、第2感磁素子12の抵抗値は、図3(b)に示す比較的大きな範囲S2で変動し、第2感磁素子12からは抵抗値の変動に対応する信号が出力される。
More specifically, as shown in FIG. 5A, the second magnetic flux vector Hb0 is inclined in the direction approaching the normal line (orthogonal direction Z) toward the magnetic pattern M (magnetic flux vector Hb1). As shown in FIG. 5 (b), it is inclined toward the downstream side of the first magnetic flux vector Hb0 (magnetic flux vector Hb2). Here, as schematically shown in FIG. 4, since the second position B is a position facing the permanent magnet 5 that generates the bias magnetic field 4, the magnetic flux density is large (the magnetic flux vector Hb0 is large). Accordingly, the component Hbf in the magnetic sensing direction F of the magnetic flux vector Hb0 detected by the second magnetic sensing element 12 changes greatly. Thereby, the resistance value of the second magnetosensitive element 12 varies within a relatively large range S2 shown in FIG. 3B, and a signal corresponding to the variation of the resistance value is output from the second magnetosensitive element 12. .
ここで、磁気パターンMが上流側検出位置Cを通過する際には、第1位置Aを通過する第1磁束ベクトルHa0もその方向を前後に変化させる。しかし、第1位置Aは第2位置Bよりも永久磁石5から離間するので、図4に模式的に示すように、第1位置Aを通過するバイアス磁界4の磁束密度は小さい(磁束ベクトルHa0は小さい)。また、直交方向Zに対する第1磁束ベクトルHa0の傾斜は、直交方向Zに対する第2磁束ベクトルHb0の傾斜よりも大きいので、例えば、第1磁束ベクトルHa0の向きの変化量と第2磁束ベクトルHb0の向きの変化量が同一の場合でも、第1感磁素子11が検出する第1磁束ベクトルHa0の感磁方向Fの成分Hafは、第2感磁素子12が検出する第1磁束ベクトルHa0の感磁方向Fの成分Hbfと比較して小さくなる。この結果、磁気パターンMが上流側検出位置Cを通過したときに、第2感磁素子12の抵抗値は図3に示す極僅かな範囲S1でしか変化せず、抵抗値の変動に対応して第2感磁素子12から出力される信号は実質的にゼロとなる。
Here, when the magnetic pattern M passes the upstream detection position C, the direction of the first magnetic flux vector Ha0 passing through the first position A is also changed back and forth. However, since the first position A is farther from the permanent magnet 5 than the second position B, the magnetic flux density of the bias magnetic field 4 passing through the first position A is small (magnetic flux vector Ha0) as schematically shown in FIG. Is small). Moreover, since the inclination of the first magnetic flux vector Ha0 with respect to the orthogonal direction Z is larger than the inclination of the second magnetic flux vector Hb0 with respect to the orthogonal direction Z, for example, the amount of change in the direction of the first magnetic flux vector Ha0 and the second magnetic flux vector Hb0 Even when the amount of change in direction is the same, the component Haf of the first magnetic flux vector Ha0 detected by the first magnetic sensing element 11 in the magnetic sensing direction F is the sensitivity of the first magnetic flux vector Ha0 detected by the second magnetic sensing element 12. It becomes smaller than the component Hbf in the magnetic direction F. As a result, when the magnetic pattern M passes the upstream detection position C, the resistance value of the second magnetosensitive element 12 changes only in a very small range S1 shown in FIG. 3, corresponding to the resistance value fluctuation. Thus, the signal output from the second magnetosensitive element 12 is substantially zero.
次に、媒体3に付与された磁気パターンMが搬送面2における第1位置Aと対向する下流側検出位置Dを通過する際には、磁気パターンMは永久磁石5と対向する領域(クリティカルパス範囲)を通過している。従って、磁気パターンMがハード材からなる場合には、磁気パターンMは着磁されている。よって、図6(a)に示すように、磁気パターンMは残留磁界8を発生させる。一方、磁気パターンMがソフト材からなる場合には、磁気パターンMが着磁されない。よって、図6(b)に示すように、残留磁界は発生しない。
Next, when the magnetic pattern M applied to the medium 3 passes through the downstream detection position D facing the first position A on the transport surface 2, the magnetic pattern M is an area facing the permanent magnet 5 (critical path). Range). Therefore, when the magnetic pattern M is made of a hard material, the magnetic pattern M is magnetized. Therefore, as shown in FIG. 6A, the magnetic pattern M generates a residual magnetic field 8. On the other hand, when the magnetic pattern M is made of a soft material, the magnetic pattern M is not magnetized. Therefore, no residual magnetic field is generated as shown in FIG.
ここで、下流側検出位置Dおよび第1位置Aは、永久磁石5と対向する領域(クリティカルパス範囲)から外れた位置にある。従って、第1感磁素子11は、磁気パターンMが着磁されている場合に、磁気パターンMの残留磁束密度に起因する磁界の変化を検出する。これにより、第1感磁素子11の抵抗値が変動するので、抵抗値の変動に対応する信号が第1感磁素子11から出力される。一方、磁気パターンMが着磁されていない場合には、第1感磁素子11は磁気パターンMの残留磁束密度に起因する磁界の変化を検出することはないので、第1感磁素子11からは抵抗値の変動に対応する信号は出力されない。
Here, the downstream side detection position D and the first position A are at positions deviating from the region facing the permanent magnet 5 (critical path range). Therefore, the first magnetosensitive element 11 detects a change in the magnetic field caused by the residual magnetic flux density of the magnetic pattern M when the magnetic pattern M is magnetized. Thereby, since the resistance value of the first magnetosensitive element 11 varies, a signal corresponding to the variation of the resistance value is output from the first magnetosensitive element 11. On the other hand, when the magnetic pattern M is not magnetized, the first magnetosensitive element 11 does not detect a change in the magnetic field due to the residual magnetic flux density of the magnetic pattern M. Does not output a signal corresponding to a change in resistance value.
図7(a)はセンサ部1がハード材からなる磁気パターンMを検出した場合の第1感磁素子11からの出力例および第2感磁素子12からの出力例を示すグラフであり、図7(b)センサ部1がソフト材からなる磁気パターンMを検出した場合の第1感磁素子11からの出力例および第2感磁素子12からの出力例を示すグラフである。図7(a)に示すように、磁気パターンMがハード材からなる場合には、第2感磁素子12および第1感磁素子11の両方から信号が出力される。一方、図7(b)に示すように、磁気パターンMがソフト材からなる場合には、第2感磁素子12からは信号が出力されるが、第1感磁素子11からは信号が出力されない。
FIG. 7A is a graph showing an output example from the first magnetosensitive element 11 and an output example from the second magnetosensitive element 12 when the sensor unit 1 detects a magnetic pattern M made of a hard material. 7 (b) is a graph showing an output example from the first magnetosensitive element 11 and an output example from the second magnetosensitive element 12 when the sensor unit 1 detects a magnetic pattern M made of a soft material. As shown in FIG. 7A, when the magnetic pattern M is made of a hard material, signals are output from both the second magnetic sensing element 12 and the first magnetic sensing element 11. On the other hand, as shown in FIG. 7B, when the magnetic pattern M is made of a soft material, a signal is output from the second magnetosensitive element 12, but a signal is output from the first magnetosensitive element 11. Not.
従って、磁気センサ装置20によれば、第1感磁素子11からの信号に基づいて、磁気パターンMがハード材から形成されているか、ソフト材から形成されているかを判別できる。また、磁気パターンMがハード材からなる場合には、第1感磁素子11からの信号および第2感磁素子12からの信号に基づいて磁気パターンMの磁気情報を取得できる。一方、磁気パターンMがソフト材からなる場合には、第2感磁素子12からの信号に基づいて磁気パターンMの磁気情報を取得できる。
Therefore, the magnetic sensor device 20 can determine whether the magnetic pattern M is formed of a hard material or a soft material based on a signal from the first magnetosensitive element 11. When the magnetic pattern M is made of a hard material, the magnetic information of the magnetic pattern M can be acquired based on the signal from the first magnetosensitive element 11 and the signal from the second magnetosensitive element 12. On the other hand, when the magnetic pattern M is made of a soft material, the magnetic information of the magnetic pattern M can be acquired based on the signal from the second magnetosensitive element 12.
また、磁気センサ装置20によれば、搬送経路21(搬送面2)の幅方向Yに配列された複数の第1感磁素子11および複数の第2感磁素子12を備えるので、媒体3の幅方向に延びる広い範囲で媒体3に付与された磁気パターンMを検出できる。
Further, according to the magnetic sensor device 20, since the plurality of first magnetosensitive elements 11 and the plurality of second magnetosensitive elements 12 arranged in the width direction Y of the conveyance path 21 (conveyance surface 2) are provided, The magnetic pattern M applied to the medium 3 can be detected in a wide range extending in the width direction.
ここで、第1感磁素子11は、磁束ベクトルの搬送方向X1(感磁方向F)の成分を検出する。従って、第1感磁素子11が、バイアス磁界4において搬送方向X1に向う磁束ベクトルを含む磁界部分に配置されていれば、第1感磁素子11は磁束ベクトルの変化を検出できる。一方、第1感磁素子11が、バイアス磁界4において搬送方向X1に対して傾斜する磁束ベクトルを含む磁界部分に配置されていると、第1感磁素子11は磁束ベクトルの搬送方向X1に沿った成分のみを検出する。よって、第1感磁素子11を通過するバイアス磁界4の変化量が同一であっても、第1感磁素子11を通過するバイアス磁界4(磁束ベクトル)が感磁方向Fに向く場合と、第1感磁素子11を通過するバイアス磁界4(磁束ベクトル)が傾斜している場合とで第1感磁素子11からは異なる信号が出力されてしまう。従って、バイアス磁界4(磁束ベクトル)が感磁方向Fに向く均一なものでなければ、磁気パターンMの磁気情報の検出精度が低下するという問題がある。
Here, the first magnetic sensing element 11 detects a component of the magnetic flux vector in the conveyance direction X1 (magnetic sensing direction F). Therefore, if the first magnetosensitive element 11 is disposed in a magnetic field portion including a magnetic flux vector directed in the transport direction X1 in the bias magnetic field 4, the first magnetosensitive element 11 can detect a change in the magnetic flux vector. On the other hand, when the first magnetosensitive element 11 is disposed in the magnetic field portion including the magnetic flux vector inclined with respect to the transport direction X1 in the bias magnetic field 4, the first magnetosensitive element 11 is along the transport direction X1 of the magnetic flux vector. Only detected components are detected. Therefore, even when the change amount of the bias magnetic field 4 passing through the first magnetosensitive element 11 is the same, the bias magnetic field 4 (magnetic flux vector) passing through the first magnetosensitive element 11 is directed in the magnetosensitive direction F. Different signals are output from the first magnetosensitive element 11 when the bias magnetic field 4 (magnetic flux vector) passing through the first magnetosensitive element 11 is inclined. Therefore, if the bias magnetic field 4 (magnetic flux vector) is not uniform in the magnetic sensing direction F, there is a problem that the detection accuracy of the magnetic information of the magnetic pattern M is lowered.
このような問題に対して、本例では、搬送方向X1で長尺状の永久磁石5を間に挟んだ両側に下流側ヨーク6および上流側ヨーク7が配置されており、永久磁石5、下流側ヨーク6および上流側ヨーク7は搬送方向X1と直交する方向に平行に延びている。従って、永久磁石5によって搬送面2を経由するように形成されるバイアス磁界4(磁束ベクトル)は、下流側ヨーク6および上流側ヨーク7に導かれ、第1感磁素子11および第2感磁素子12の感磁方向Fである搬送方向X1に向く均一なものとなる。これにより、幅方向Yにおける位置に拘わらず第1感磁素子11を通過するバイアス磁界4(磁束ベクトル)が搬送方向X1に対して傾斜することがないので、磁気パターンMの磁気情報を精度よく検出できる。
In order to deal with such a problem, in this example, the downstream yoke 6 and the upstream yoke 7 are arranged on both sides of the long permanent magnet 5 between the permanent magnet 5 and the downstream in the transport direction X1. The side yoke 6 and the upstream yoke 7 extend in parallel to a direction orthogonal to the transport direction X1. Accordingly, the bias magnetic field 4 (magnetic flux vector) formed by the permanent magnet 5 so as to pass through the transport surface 2 is guided to the downstream yoke 6 and the upstream yoke 7, and the first magnetosensitive element 11 and the second magnetosensitive element. It becomes uniform in the transport direction X1, which is the magnetic sensing direction F of the element 12. As a result, the bias magnetic field 4 (magnetic flux vector) passing through the first magnetosensitive element 11 does not tilt with respect to the transport direction X1 regardless of the position in the width direction Y, so that the magnetic information of the magnetic pattern M can be accurately obtained. It can be detected.
また、本例では、幅方向Yの端に配置された感磁素子11、12が永久磁石5の端からの距離Tが永久磁石5の上下方向における高さ寸法Lの1/2以上離間している。従って、幅方向Yの端に配置された感磁素子11、12を通過するバイアス磁界4(磁束ベクトル)についても感磁方向Fに向くものとすることができる。
Further, in this example, the magnetic sensing elements 11 and 12 arranged at the end in the width direction Y are separated from the end of the permanent magnet 5 by a distance T of 1/2 or more of the height L in the vertical direction of the permanent magnet 5. ing. Therefore, the bias magnetic field 4 (magnetic flux vector) passing through the magnetosensitive elements 11 and 12 disposed at the end in the width direction Y can also be oriented in the magnetosensitive direction F.
さらに、本例では、永久磁石5の両側に配置した下流側ユークと上流側ヨーク7によって永久磁石5が発生させるバイアス磁界4が必要以上に広がることが抑制されている。従って、第1感磁素子11および第2感磁素子12が媒体3の磁気パターンMとは異なる磁性体の動きに起因する磁界の変化を検出することを防止できる。また、永久磁石5の両側に配置した下流側ユークと上流側ヨーク7を備えることにより、センサ部1の外部の磁界から第1感磁素子11および第2感磁素子12が影響を受けることを防止或いは抑制できる。
Furthermore, in this example, it is suppressed that the bias magnetic field 4 generated by the permanent magnet 5 is unnecessarily spread by the downstream side YUK and the upstream side yoke 7 arranged on both sides of the permanent magnet 5. Accordingly, it is possible to prevent the first magnetic sensing element 11 and the second magnetic sensing element 12 from detecting a change in the magnetic field caused by the movement of a magnetic material different from the magnetic pattern M of the medium 3. Further, by providing the downstream side YUK and the upstream side yoke 7 disposed on both sides of the permanent magnet 5, the first magnetic sensing element 11 and the second magnetic sensing element 12 are affected by the magnetic field outside the sensor unit 1. It can be prevented or suppressed.
(センサ部の変形例1)
図8(a)は変形例1のセンサ部の説明図であり、図8(b)は変形例2のセンサ部の説明図である。図8(a)に示すように、変形例1のセンサ部1Aは、感磁素子として、第1感磁素子11、第2感磁素子12および第3感磁素子13を備える。第3感磁素子13は、搬送面2と直交する直交方向Zで上流側ヨーク7と対向して永久磁石5とは対向しない第3位置Eに配置されている。第3位置Eは、媒体3が搬送面2に沿って第2感磁素子12を通過する際に当該第3位置Eに配置した第3感磁素子13の抵抗値が極僅かな範囲でしか変化せず、抵抗値の変動に対応して第3感磁素子13から出力される信号が実質的にゼロとなる位置とすることができる。 (Modification 1 of sensor part)
FIG. 8A is an explanatory diagram of the sensor unit of the first modification, and FIG. 8B is an explanatory diagram of the sensor unit of the second modification. As shown in FIG. 8A, thesensor unit 1A of the first modification includes a first magnetosensitive element 11, a second magnetosensitive element 12, and a third magnetosensitive element 13 as magnetosensitive elements. The third magnetosensitive element 13 is disposed at a third position E facing the upstream yoke 7 in the orthogonal direction Z orthogonal to the transport surface 2 and not facing the permanent magnet 5. The third position E is only in a range where the resistance value of the third magnetosensitive element 13 arranged at the third position E when the medium 3 passes through the second magnetosensitive element 12 along the transport surface 2 is extremely small. It can be set to a position where the signal output from the third magneto-sensitive element 13 becomes substantially zero corresponding to the variation of the resistance value without changing.
図8(a)は変形例1のセンサ部の説明図であり、図8(b)は変形例2のセンサ部の説明図である。図8(a)に示すように、変形例1のセンサ部1Aは、感磁素子として、第1感磁素子11、第2感磁素子12および第3感磁素子13を備える。第3感磁素子13は、搬送面2と直交する直交方向Zで上流側ヨーク7と対向して永久磁石5とは対向しない第3位置Eに配置されている。第3位置Eは、媒体3が搬送面2に沿って第2感磁素子12を通過する際に当該第3位置Eに配置した第3感磁素子13の抵抗値が極僅かな範囲でしか変化せず、抵抗値の変動に対応して第3感磁素子13から出力される信号が実質的にゼロとなる位置とすることができる。 (
FIG. 8A is an explanatory diagram of the sensor unit of the first modification, and FIG. 8B is an explanatory diagram of the sensor unit of the second modification. As shown in FIG. 8A, the
本例によれば、下流側ヨーク6および永久磁石5をこの順番で通過する逆搬送方向X2に媒体3を搬送したときに、第3感磁素子13は永久磁石5により着磁された磁気パターンMの残留磁束密度を検出する。この一方で、第3感磁素子13は磁気パターンMの透磁率に起因するバイアス磁界4の変化を検出しない。従って、媒体3が逆搬送方向X2に搬送される場合には、第3感磁素子13からの信号に基づいて、磁気パターンMがハード材から形成されているか、ソフト材から形成されているかを判別できる。また、第2感磁素子12からの信号および第3感磁素子13からの信号に基づいてハード材からなる磁気パターンMの磁気情報を取得でき、第2感磁素子12からの信号に基づいてソフト材からなる磁気パターンMの磁気情報を取得できる。
According to this example, when the medium 3 is transported in the reverse transport direction X2 that passes through the downstream yoke 6 and the permanent magnet 5 in this order, the third magnetosensitive element 13 is magnetized by the permanent magnet 5. The residual magnetic flux density of M is detected. On the other hand, the third magnetosensitive element 13 does not detect a change in the bias magnetic field 4 due to the magnetic permeability of the magnetic pattern M. Accordingly, when the medium 3 is transported in the reverse transport direction X2, whether the magnetic pattern M is formed from a hard material or a soft material based on a signal from the third magnetosensitive element 13 is determined. Can be determined. Further, the magnetic information of the magnetic pattern M made of a hard material can be acquired based on the signal from the second magnetosensitive element 12 and the signal from the third magnetosensitive element 13, and based on the signal from the second magnetosensitive element 12. Magnetic information of the magnetic pattern M made of a soft material can be acquired.
(センサ部の変形例2)
図8(b)に示すように、変形例2のセンサ部1Bは、搬送方向X1で下流側ヨーク6の下流側に第2の永久磁石15を備える。上流側ヨーク7は省略されている。 (Modification 2 of sensor part)
As illustrated in FIG. 8B, thesensor unit 1 </ b> B of Modification 2 includes a second permanent magnet 15 on the downstream side of the downstream yoke 6 in the transport direction X <b> 1. The upstream yoke 7 is omitted.
図8(b)に示すように、変形例2のセンサ部1Bは、搬送方向X1で下流側ヨーク6の下流側に第2の永久磁石15を備える。上流側ヨーク7は省略されている。 (
As illustrated in FIG. 8B, the
第2の永久磁石15は媒体3に第2のバイアス磁界16を印加するものである。ここで、第1位置Aは、媒体3が永久磁石5と対向する位置を通過する際に当該第1位置Aに配置された第1感磁素子11の抵抗値が極僅かな範囲でしか変化せず、抵抗値の変動に対応して出力される信号が実質的にゼロとなる位置である。これに加えて、第1位置Aは、媒体3が第2の永久磁石15と対向する位置を通過する際に当該第1位置Aに配置された第1感磁素子11の抵抗値が極僅かな範囲でしか変化せず、抵抗値の変動に対応して出力される信号が実質的にゼロとなる位置とすることができる。
The second permanent magnet 15 applies the second bias magnetic field 16 to the medium 3. Here, the first position A changes only within a very small range of the resistance value of the first magnetosensitive element 11 disposed at the first position A when the medium 3 passes the position facing the permanent magnet 5. In other words, the signal output corresponding to the variation of the resistance value is substantially zero. In addition, the first position A has a very small resistance value of the first magnetosensitive element 11 disposed at the first position A when the medium 3 passes the position facing the second permanent magnet 15. It can be set to a position where the signal that changes only within a certain range and the signal output corresponding to the change in the resistance value becomes substantially zero.
本例によれば、媒体3が第2の永久磁石15、下流側ヨーク6および永久磁石5をこの順番で通過する逆搬送方向X2に搬送される場合には、第1感磁素子11は第2の永久磁石15により着磁された磁気パターンMの残留磁束密度を検出する。この一方で、第1感磁素子11は磁気パターンMの透磁率に起因するバイアス磁界16の変化を検出しない。従って、媒体3が逆搬送方向X2に搬送される場合には、第1感磁素子11からの信号に基づいて、磁気パターンMがハード材から形成されているか、ソフト材から形成されているかを判別できる。また、第1感磁素子11からの信号および第2感磁素子12からの信号に基づいてハード材からなる磁気パターンMの磁気情報を取得でき、第2感磁素子12からの信号に基づいてソフト材からなる磁気パターンMの磁気情報を取得できる。
According to this example, when the medium 3 is transported in the reverse transport direction X2 passing through the second permanent magnet 15, the downstream yoke 6 and the permanent magnet 5 in this order, the first magnetosensitive element 11 is The residual magnetic flux density of the magnetic pattern M magnetized by the two permanent magnets 15 is detected. On the other hand, the first magnetosensitive element 11 does not detect a change in the bias magnetic field 16 due to the magnetic permeability of the magnetic pattern M. Therefore, when the medium 3 is transported in the reverse transport direction X2, whether the magnetic pattern M is formed of a hard material or a soft material based on a signal from the first magnetosensitive element 11 is determined. Can be determined. Further, the magnetic information of the magnetic pattern M made of a hard material can be acquired based on the signal from the first magnetosensitive element 11 and the signal from the second magnetosensitive element 12, and based on the signal from the second magnetosensitive element 12. Magnetic information of the magnetic pattern M made of a soft material can be acquired.
なお、センサ部1Bにおいて、上流側ヨーク7を備えてもよい。また、搬送方向X1で第2の永久磁石15の下流側に第2の下流側ヨークを備えても良い。これらのヨークを備えれば、永久磁石5、15が発生させるバイアス磁界4、16が必要以上に広がることが抑制される。従って、第1感磁素子11、第2感磁素子12および第3感磁素子が磁気パターンMとは異なる磁性体の動きに起因する磁界の変化を検出することを防止できる。また、センサ部1Bの外部の磁界から第1感磁素子11、第2感磁素子12および第3感磁素子13が影響を受けることを防止或いは抑制できる。
In addition, the upstream yoke 7 may be provided in the sensor unit 1B. Further, a second downstream yoke may be provided on the downstream side of the second permanent magnet 15 in the transport direction X1. If these yokes are provided, the bias magnetic fields 4 and 16 generated by the permanent magnets 5 and 15 are prevented from spreading more than necessary. Accordingly, it is possible to prevent the first magnetosensitive element 11, the second magnetosensitive element 12, and the third magnetosensitive element from detecting a change in the magnetic field caused by the movement of a magnetic material different from the magnetic pattern M. Moreover, it can prevent or suppress that the 1st magneto-sensitive element 11, the 2nd magneto-sensitive element 12, and the 3rd magneto-sensitive element 13 are influenced from the magnetic field outside the sensor part 1B.
1…センサ部、2…搬送面(移動面)、3…媒体、4…バイアス磁界、5…永久磁石、6…下流側ヨーク、7…上流側ヨーク、11…第1感磁素子、12…第2感磁素子、13…第3感磁素子、15…第2の永久磁石、16…第2のバイアス磁界、20…磁気センサ装置、A…第1位置、B…第2位置、E…第3位置、F…感磁方向、M…磁気パターン、X1…移動方向、Z…直交方向
DESCRIPTION OF SYMBOLS 1 ... Sensor part, 2 ... Conveyance surface (moving surface), 3 ... Medium, 4 ... Bias magnetic field, 5 ... Permanent magnet, 6 ... Downstream side yoke, 7 ... Upstream side yoke, 11 ... 1st magnetoresistive element, 12 ... 2nd magnetic sensing element, 13 ... 3rd magnetic sensing element, 15 ... 2nd permanent magnet, 16 ... 2nd bias magnetic field, 20 ... Magnetic sensor apparatus, A ... 1st position, B ... 2nd position, E ... 3rd position, F ... Magnetosensitive direction, M ... Magnetic pattern, X1 ... Moving direction, Z ... Orthogonal direction
Claims (11)
- 移動面に沿って相対移動する媒体に付与された磁気パターンを感磁素子により検出する磁気センサ装置において、
前記媒体にバイアス磁界を印加する磁石と、
前記媒体の移動方向で前記磁石の下流側に配置された下流側ヨークと、を有し、
前記感磁素子として、前記移動面と直交する直交方向で前記下流側ヨークと対向して前記磁石とは対向しない第1位置に配置された第1感磁素子と、前記直交方向で前記磁石と対向する第2位置に配置された第2感磁素子と、を備えることを特徴とする磁気センサ装置。 In a magnetic sensor device for detecting a magnetic pattern applied to a medium that moves relatively along a moving surface by a magnetosensitive element,
A magnet for applying a bias magnetic field to the medium;
A downstream yoke disposed on the downstream side of the magnet in the moving direction of the medium,
As the magnetosensitive element, a first magnetosensitive element disposed at a first position facing the downstream yoke in a direction orthogonal to the moving surface and not facing the magnet, and the magnet in the orthogonal direction, A magnetic sensor device comprising: a second magnetosensitive element disposed at a second position facing the magnetic sensor device. - 請求項1において、
前記第1位置および前記第2位置は、前記磁石から前記移動面を経由して前記下流側ヨークに至る前記バイアス磁界内にあることを特徴とする磁気センサ装置。 In claim 1,
The magnetic sensor device according to claim 1, wherein the first position and the second position are in the bias magnetic field from the magnet to the downstream yoke via the moving surface. - 請求項1または2において、
前記第1感磁素子は、感磁方向を前記移動方向に向けていることを特徴とする磁気センサ装置。 In claim 1 or 2,
The magnetic sensor device according to claim 1, wherein the first magnetic sensitive element has a magnetic sensitive direction in the moving direction. - 請求項1から3のうちのいずれかの項において、
前記感磁素子は、MR素子であることを特徴とする磁気センサ装置。 In any one of claims 1 to 3,
The magnetic sensor device is characterized in that the magnetosensitive element is an MR element. - 請求項1から4のうちのいずれかの項において、
前記移動方向で前記磁石の上流側に配置された上流側ヨークを有することを特徴とする磁気センサ装置。 In any one of claims 1 to 4,
A magnetic sensor device comprising an upstream yoke disposed on the upstream side of the magnet in the moving direction. - 請求項5において、
前記磁石における移動面側の端面、および、前記下流側ヨークにおける移動面側の端面、および、前記上流側ヨークにおける移動面側の端面は、同一平面上に位置しており、前記移動面と平行に延びていることを特徴とする磁気センサ装置。 In claim 5,
The end surface on the moving surface side of the magnet, the end surface on the moving surface side of the downstream yoke, and the end surface on the moving surface side of the upstream yoke are located on the same plane and are parallel to the moving surface. A magnetic sensor device, characterized in that the magnetic sensor device extends. - 請求項5において、
前記感磁素子として、前記移動面と直交する直交方向で前記上流側ヨークと対向して前記磁石とは対向しない第3位置に配置された第3感磁素子を備えることを特徴とする磁気センサ装置。 In claim 5,
A magnetic sensor comprising a third magnetosensitive element disposed at a third position facing the upstream yoke in a direction orthogonal to the moving surface and not facing the magnet as the magnetosensitive element. apparatus. - 請求項1から4のうちのいずれかの項において、
前記媒体に第2のバイアス磁界を印加する第2の磁石を有し、
前記第2の磁石は、前記移動方向で前記下流側ヨークの下流側に位置することを特徴とする磁気センサ装置。 In any one of claims 1 to 4,
A second magnet for applying a second bias magnetic field to the medium;
The magnetic sensor device according to claim 1, wherein the second magnet is positioned downstream of the downstream yoke in the moving direction. - 請求項1から8のうちのいずれかの項において、
前記第1感磁素子および前記第2感磁素子は、それぞれ前記移動方向と交差して前記移動面に沿った方向に複数配列されており、
前記磁石は、複数の前記第2感磁素子の配列方向に延びて各第2感磁素子と対向することを特徴とする磁気センサ装置。 In any one of claims 1 to 8,
A plurality of the first magnetosensitive elements and the second magnetosensitive elements are arranged in a direction along the moving surface, intersecting the moving direction, respectively.
The magnetic sensor device according to claim 1, wherein the magnet extends in an arrangement direction of the plurality of second magnetic sensing elements and faces each second magnetic sensing element. - 請求項9において、
前記下流側ヨークは、前記磁石に沿って延びて各第1感磁素子と対向することを特徴とする磁気センサ装置。 In claim 9,
The downstream yoke extends along the magnet and opposes each first magnetosensitive element. - 請求項1において、
前記媒体の移動方向と直交する移動経路の幅方向の前記第1感磁素子および前記第2感磁素子は、前記磁石の端からの距離が前記磁石の前記媒体の移動方向および前記搬送経路の幅方向と直交する高さ寸法の1/2以上離間していることを特徴とする磁気センサ装置。 In claim 1,
The first magnetosensitive element and the second magnetosensitive element in the width direction of the moving path orthogonal to the moving direction of the medium are such that the distance from the end of the magnet is the moving direction of the medium of the magnet and the conveying path. A magnetic sensor device, wherein the magnetic sensor device is separated by at least 1/2 of the height dimension orthogonal to the width direction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201680023051.3A CN108156821A (en) | 2015-04-24 | 2016-03-18 | Magnet sensor arrangement |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015089684A JP2016206069A (en) | 2015-04-24 | 2015-04-24 | Magnetic sensor device |
JP2015-089684 | 2015-04-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016170885A1 true WO2016170885A1 (en) | 2016-10-27 |
Family
ID=57142995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2016/058775 WO2016170885A1 (en) | 2015-04-24 | 2016-03-18 | Magnetic sensor device |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP2016206069A (en) |
CN (1) | CN108156821A (en) |
WO (1) | WO2016170885A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6660191B2 (en) * | 2016-01-25 | 2020-03-11 | 株式会社ヴィーネックス | Magnetic sensor device |
JP6289775B1 (en) * | 2016-05-06 | 2018-03-07 | 三菱電機株式会社 | Magnetic sensor device |
JP7020258B2 (en) * | 2018-04-06 | 2022-02-16 | 村田機械株式会社 | Position detection system and driving system |
WO2020149375A1 (en) * | 2019-01-17 | 2020-07-23 | キヤノン電子株式会社 | Magnetic identification sensor |
WO2021199757A1 (en) * | 2020-03-30 | 2021-10-07 | 三菱電機株式会社 | Magnetic sensor device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010052797A1 (en) * | 2008-11-10 | 2010-05-14 | グローリー株式会社 | Magnetic property detection apparatus |
JP2013120538A (en) * | 2011-12-08 | 2013-06-17 | Nidec Sankyo Corp | Magnetic sensor device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5719515B2 (en) * | 2010-02-05 | 2015-05-20 | 日本電産サンキョー株式会社 | Magnetic sensor device |
KR101564126B1 (en) * | 2010-12-28 | 2015-10-28 | 니혼 덴산 산쿄 가부시키가이샤 | Magnetic sensor device and method of manufacturing magnetic sensor device |
CN104105977B (en) * | 2012-02-13 | 2017-09-26 | 株式会社村田制作所 | magnetic sensing device |
US9279866B2 (en) * | 2012-04-09 | 2016-03-08 | Mitsubishi Electric Corporation | Magnetic sensor |
-
2015
- 2015-04-24 JP JP2015089684A patent/JP2016206069A/en active Pending
-
2016
- 2016-03-18 CN CN201680023051.3A patent/CN108156821A/en not_active Withdrawn
- 2016-03-18 WO PCT/JP2016/058775 patent/WO2016170885A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010052797A1 (en) * | 2008-11-10 | 2010-05-14 | グローリー株式会社 | Magnetic property detection apparatus |
JP2013120538A (en) * | 2011-12-08 | 2013-06-17 | Nidec Sankyo Corp | Magnetic sensor device |
Also Published As
Publication number | Publication date |
---|---|
CN108156821A (en) | 2018-06-12 |
JP2016206069A (en) | 2016-12-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2016170885A1 (en) | Magnetic sensor device | |
JP5474195B2 (en) | Magnetic detection device | |
RU2610341C1 (en) | Magnetic propriety detection device | |
JP5719515B2 (en) | Magnetic sensor device | |
JP4508058B2 (en) | Magnetic field detection device and manufacturing method thereof | |
JP6300908B2 (en) | Magnetic sensor device | |
US20100001723A1 (en) | Bridge type sensor with tunable characteristic | |
US9244136B2 (en) | Magnetic sensor with reduced effect of interlayer coupling magnetic field | |
CA2869294A1 (en) | Magnetic sensor | |
JP6359858B2 (en) | Magnetic field detection device and magnetic identification device | |
US7427859B2 (en) | Moving body detecting apparatus | |
JP2008145379A (en) | Magnetic sensor | |
WO2016170886A1 (en) | Magnetic sensor device | |
WO2016170887A1 (en) | Magnetic sensor device | |
US10222431B2 (en) | Measuring device with pre-magnetizing magnet | |
JP2006293575A (en) | Apparatus and method for identifying paper sheet | |
JP2012215405A (en) | Magnetic sensor device | |
JP4338090B2 (en) | Magnetic powder adhesion medium or magnetic film adhesion medium detector | |
JP6075225B2 (en) | Magnetic sensor device | |
WO2020149375A1 (en) | Magnetic identification sensor | |
JP5861551B2 (en) | Magnetic sensor device | |
JP2008145302A (en) | Magnetic sensor | |
JP6980166B1 (en) | Magnetic sensor device | |
JPWO2021024758A1 (en) | Magnetic sensor device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 16782907 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 16782907 Country of ref document: EP Kind code of ref document: A1 |