WO2016170887A1 - Dispositif de capteur magnétique - Google Patents

Dispositif de capteur magnétique Download PDF

Info

Publication number
WO2016170887A1
WO2016170887A1 PCT/JP2016/058782 JP2016058782W WO2016170887A1 WO 2016170887 A1 WO2016170887 A1 WO 2016170887A1 JP 2016058782 W JP2016058782 W JP 2016058782W WO 2016170887 A1 WO2016170887 A1 WO 2016170887A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
magnetic
magnetosensitive element
medium
magnetosensitive
Prior art date
Application number
PCT/JP2016/058782
Other languages
English (en)
Japanese (ja)
Inventor
百瀬　正吾
Original Assignee
日本電産サンキョー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産サンキョー株式会社 filed Critical 日本電産サンキョー株式会社
Priority to CN201680023045.8A priority Critical patent/CN108174610A/zh
Publication of WO2016170887A1 publication Critical patent/WO2016170887A1/fr

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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N50/00—Galvanomagnetic devices
    • H10N50/10—Magnetoresistive devices

Definitions

  • the present invention relates to a magnetic sensor device for detecting magnetic information of a medium.
  • magnetic ink containing soft materials such as soft magnetic stainless powder (soft magnetic material) and hard materials such as ferrite powder (hard magnetic material)
  • soft magnetic stainless powder soft magnetic material
  • hard materials such as ferrite powder (hard magnetic material)
  • the magnetic ink containing the material) is used properly, but both the magnetic pattern including the soft material and the magnetic pattern including the hard material have magnetic permeability.
  • the magnetic pattern includes a soft material and a hard material includes In either case, the signal output from the magnetosensitive element 40 swings in both the negative and positive directions. Therefore, there is a problem that a magnetic pattern including a soft material and a magnetic pattern including a hard material cannot be distinguished.
  • an object of the present invention is to provide a magnetic sensor device that can determine whether a magnetic material portion is a hard material or a soft material in addition to the presence or absence of a magnetic material portion in a medium. There is.
  • a magnetic sensor device includes a permanent magnet that forms a magnetic field in a direction along the medium conveyance direction with respect to a medium conveyance path, and the conveyance path with respect to the permanent magnet. And a magnetosensitive element arranged in the magnetic field of the permanent magnet on the side.
  • the magnetic field of the medium changes the magnetic field at the position where the magnetosensitive element is arranged.
  • the presence or absence of a body part can be detected.
  • the permanent magnet generates a magnetic field in a direction along the conveyance direction of the medium. For this reason, when the medium passes through the transport path, the direction in which the magnetic field at the position where the magnetosensitive element is disposed changes only due to the influence of the magnetic permeability of the magnetic material portion. Therefore, the signal output from the magnetosensitive element is only affected in the positive or negative direction under the influence of the magnetic permeability of the magnetic part of the medium.
  • the direction in which the magnetic field at the position where the magnetosensitive element is arranged due to the influence of the residual magnetic flux density of the magnetic part changes in the direction of the medium relative to the permanent magnet or the magnetosensitive element.
  • both the direction of strengthening and the direction of weakening are obtained. Therefore, when the magnetic part is made of a hard material such as ferrite powder, the signal output from the magnetosensitive element swings in the positive and negative directions, whereas the magnetic part is soft magnetic stainless steel powder or the like. In the case of the soft material, the signal output from the magnetosensitive element swings to only one of the positive side and the negative side. Therefore, it can be determined whether the magnetic part is made of a hard material or a soft material.
  • the permanent magnet is provided with an S pole and an N pole in a direction along the conveyance direction of the medium. According to such a configuration, a magnetic field in a direction along the conveyance direction of the medium can be formed with a simple configuration.
  • the magnetosensitive element is disposed between the transport path and the permanent magnet. According to this configuration, it is possible to easily realize a configuration in which the medium is pressed against the magnetosensitive element by a roller or the like.
  • the magnetosensitive element is arranged to face the permanent magnet.
  • a plurality of the permanent magnets and the magnetosensitive elements are arranged in a direction intersecting the transport direction of the medium, and the magnetic poles of the plurality of permanent magnets have the same magnetization direction.
  • the magnetosensitive element is disposed at a position separated from the first magnetosensitive element in the transport direction with respect to the first magnetosensitive element, and generates a differential output with the first magnetosensitive element.
  • a mode including the second magnetosensitive element can be employed. According to such a configuration, it is possible to suppress the influence of the temperature characteristics of the magnetosensitive element.
  • the permanent magnet includes a first permanent magnet and a second permanent magnet disposed at a position spaced apart from the first permanent magnet in the transport direction, and the first permanent magnet and the A mode in which the magnetic field is formed by the leakage magnetic flux between the second permanent magnet and the second permanent magnet can be employed.
  • the magnetosensitive element includes a first magnetosensitive element facing the first permanent magnet on the second permanent magnet side from the center in the transport direction of the first permanent magnet, and the second permanent magnet. It is preferable that the first permanent magnet is opposed to the second permanent magnet on the first permanent magnet side from the center in the transport direction, and includes the first magnetosensitive element and a second magnetosensitive element that generates a differential output. According to such a configuration, it is possible to suppress the influence of the temperature characteristics of the magnetosensitive element.
  • the end of the first magnetosensitive element on the second magnetosensitive element side is located closer to the second magnetosensitive element than the end of the first permanent magnet on the second permanent magnet side.
  • the end of the second magnetosensitive element on the first magnetosensitive element side is positioned closer to the first magnetosensitive element than the end of the second permanent magnet on the first permanent magnet side. Is preferred.
  • the magnetosensitive element includes a first magnetosensitive element facing the first permanent magnet on the second permanent magnet side from the center in the transport direction of the first permanent magnet, and the first magnetoresistive element.
  • a second magnetosensitive element that opposes the first permanent magnet on a side opposite to the second permanent magnet from the center of the conveying direction of the permanent magnet and generates a differential output with the first magnetosensitive element;
  • a third magnetosensitive element facing the second permanent magnet on the first permanent magnet side from the center of the two permanent magnets in the transport direction; and the first permanent magnet from the center of the second permanent magnet in the transport direction May be configured to include the fourth magnetosensitive element that faces the second permanent magnet on the opposite side and generates the differential output with the third magnetosensitive element. According to such a configuration, it is possible to suppress the influence of the temperature characteristics of the magnetosensitive element.
  • the end of the first magnetosensitive element on the side opposite to the second magnetosensitive element is more than the end of the first permanent magnet on the second permanent magnet side.
  • the second magnetosensitive element is entirely opposed to the first permanent magnet, and the end of the third magnetosensitive element opposite to the fourth magnetosensitive element is The second permanent magnet is positioned on the opposite side of the first permanent magnet side from the end portion on the first permanent magnet side, and the fourth magnetosensitive element is entirely opposed to the second permanent magnet. Is preferred.
  • the magnetosensitive element is preferably a magnetoresistive element.
  • a plurality of the magnetosensitive elements are arranged in a direction intersecting with the transport direction of the medium.
  • the permanent magnet extends in a direction intersecting with the conveyance direction of the medium and faces the plurality of magnetosensitive elements arranged in the intersecting direction. According to this configuration, when detecting magnetic information in the width direction of the medium (direction intersecting the transport direction), an appropriate magnetic field can be generated in the width direction.
  • the magnetic field of the medium changes the magnetic field at the position where the magnetosensitive element is arranged.
  • the presence or absence of a body part can be detected.
  • the permanent magnet generates a magnetic field in a direction along the conveyance direction of the medium. For this reason, when the medium passes through the transport path, the direction in which the magnetic field at the position where the magnetosensitive element is disposed changes only due to the influence of the magnetic permeability of the magnetic material portion. Therefore, the signal output from the magnetosensitive element is only affected in the positive or negative direction under the influence of the magnetic permeability of the magnetic part of the medium.
  • the direction in which the magnetic field at the position where the magnetosensitive element is arranged due to the influence of the residual magnetic flux density of the magnetic part changes in the direction of the medium relative to the permanent magnet or the magnetosensitive element.
  • both the direction of strengthening and the direction of weakening are obtained. Therefore, when the magnetic part is made of a hard material such as ferrite powder, the signal output from the magnetosensitive element swings in the positive and negative directions, whereas the magnetic part is soft magnetic stainless steel powder or the like. In the case of the soft material, the signal output from the magnetosensitive element swings to only one of the positive side and the negative side. Therefore, it can be determined whether the magnetic part is made of a hard material or a soft material.
  • the transport direction of the medium M is the first direction Y
  • the thickness direction of the medium M perpendicular to the first direction Y is the second direction Z
  • the first direction Y and the second direction Z are orthogonal.
  • the width direction of the medium M to be performed will be described as the third direction X.
  • one side of the first direction Y, the second direction Z, and the third direction X is shown with Y1, Z1, and X1, respectively, and the first direction Y, the second direction Z, and the third direction X are illustrated.
  • the other side is shown with Y2, Z2, and X2, respectively.
  • FIG. 1 is an explanatory diagram showing a configuration of a magnetic pattern detection device including a magnetic sensor device according to Embodiment 1 of the present invention.
  • FIGS. 1 (a) and 1 (b) are main parts of the magnetic pattern detection device. It is explanatory drawing which shows typically, and explanatory drawing which shows a cross section typically.
  • FIG. 1B the magnetic field formed by the permanent magnet 30 is schematically shown by a broken line R.
  • a magnetic pattern detection device 100 shown in FIG. 1 is a device that detects magnetic information from a medium M such as banknotes, securities, etc., and performs authenticity determination and type determination, and uses a roller, a guide (not shown), or the like.
  • a conveyance device 10 that conveys the sheet-like medium M in the first direction Y along the conveyance path 11 and a magnetic sensor device 20 that detects magnetic information from the medium M at a midway position in the conveyance path 11 are provided.
  • the roller and the guide are made of a nonmagnetic material such as aluminum.
  • the magnetic sensor device 20 is disposed below the transport path 11 (one side Z1 in the second direction Z), but is disposed above the transport path 11 (the other side Z2 in the second direction Z). Sometimes. In any case, the magnetic sensor device 20 is arranged so that the sensor surface 21 faces the transport path 11.
  • a predetermined magnetic pattern is formed on the medium M depending on the type.
  • a plurality of types of magnetic patterns having different residual magnetic flux densities and magnetic permeability may be formed on the medium M.
  • the medium M may be formed with a first magnetic pattern printed with magnetic ink containing a hard material or a second magnetic pattern printed with magnetic ink containing a soft material. Therefore, the magnetic pattern detection apparatus 100 according to the present embodiment detects the presence / absence of the magnetic pattern and the type of the magnetic pattern for each medium M, and determines whether the medium M is true or false.
  • 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.
  • FIG. 2 is an explanatory diagram showing a detailed configuration of the magnetic sensor device 20 according to the first embodiment of the present invention.
  • the magnetic sensor device 20 includes a permanent magnet 30 that forms a magnetic field in the transport path 11 of the medium M, and a transport path with respect to the permanent magnet 30. 11 has a magnetosensitive element 40 disposed in the magnetic field of the permanent magnet 30.
  • the permanent magnet 30 is made of a rare earth magnet such as a ferrite magnet or a neodymium magnet.
  • the magnetosensitive element 40 is disposed between the transport path 11 and the permanent magnet 30 in the second direction Z, and is held in the nonmagnetic case 25 together with the permanent magnet 30.
  • the magnetic sensor device 20 includes a sensor surface 21 that forms substantially the same plane as the transport path 11, and slope portions 22 and 23 that are connected to both sides in the moving direction of the medium M with respect to the sensor surface 21. Is defined by the shape of the case 25. In this embodiment, since the slope portions 22 and 23 are provided, there is an advantage that the medium M is not easily caught.
  • the magnetic sensor device 20 extends in a third direction X that intersects the conveyance direction A1 (first direction Y) of the medium M, and the permanent magnet 30 and the magnetosensitive element 40 intersect the conveyance direction A1 of the medium M.
  • a plurality are arranged in the direction of movement (third direction X).
  • the magnetic sensor device 20 extends linearly in a third direction X orthogonal to the conveyance direction A1 (first direction Y) of the medium M, and the permanent magnet 30 and the magnetosensitive element 40 are respectively
  • a plurality of lines are arranged linearly in the third direction X.
  • the plurality of permanent magnets 30 arranged in the third direction X all have the same size, shape, magnetization direction, and the like.
  • the plurality of magnetosensitive elements 40 arranged in the third direction X are all magnetic sensor elements having the same configuration.
  • the medium M may be transported in the transport direction A2 opposite to the transport direction A1.
  • the magnetosensitive element 40 is a magnetoresistive element, and a magnetoresistive pattern (not shown) is formed on the sensor substrate 49.
  • an anisotropic magnetoresistive element AMR (Anisotropic-Magneto-Resistance) having a magnetoresistive pattern made of a thin film ferromagnetic metal is used as the magnetosensitive element 40. It extends in the third direction X.
  • the magnetosensitive element 40 is disposed so as to face the permanent magnet 30 on the upstream side of the transport direction A1 from the center of the transport direction A1 of the permanent magnet 30.
  • the magnetic pattern detection device 100 includes a signal processing unit that determines the authenticity and type of the medium M based on a signal output from the magnetic sensor device 20.
  • the signal processing unit determines the presence / absence of the magnetic pattern, the type of magnetic pattern, and the formation position on the medium M based on the signal output from the magnetic sensor device 20 and the relative position information between the medium M and the magnetic sensor device 20. Detect and determine the authenticity and type of the medium M. More specifically, the signal processing unit relates the signal output from the magnetic sensor device 20 to the relative position information between the magnetic sensor device 20 and the medium M, and compares the signal with the comparison pattern recorded in advance in the recording unit. Verification is performed to determine the authenticity and type of the medium M.
  • 4 is an explanatory diagram illustrating the principle of detecting magnetic information of the medium M based on the residual magnetic flux density of the magnetic pattern formed on the medium M in the magnetic sensor device 20 according to the first embodiment of the present invention.
  • 4A, 4 ⁇ / b> B, and 4 ⁇ / b> C are explanatory diagrams showing the relative positional relationship between the medium M and the magnetosensitive element 40 when the medium M is conveyed, and the magnetoresistance characteristics of the magnetosensitive element 40. It is explanatory drawing shown, and explanatory drawing of the output signal from the magnetic sensing element 40.
  • the permanent magnet 30 is shown above the magnetic sensing element 40 toward the drawing, and the magnetic sensing element 40 toward the drawing.
  • the conveyance path 11 for the medium M is shown below the line.
  • the magnetic field formed by the permanent magnet 30 is schematically shown by a broken line R.
  • the relative positions of the permanent magnet 30 and the magnetosensitive element 40 are arranged such that the permanent magnet 30 and the magnetosensitive element 40 are arranged at a position Pa1 shown in FIG. 3A and a position Pa2 shown in FIG.
  • the magnetic field Ha bias magnetic field in which the change in the electric resistance value becomes larger with respect to the change in the magnetic flux density in the electric resistance value-magnetic flux density characteristic of the magnetosensitive element 40 when the medium M has not reached the position where it is applied. ) Is applied.
  • the magnetic field applied to the magnetosensitive element 40 is present in the medium M. It becomes larger than the magnetic field Ha when not. For this reason, the electrical resistance value of the magnetoresistive pattern of the magnetosensitive element 40 is shifted in the direction indicated by the arrow S2 on the graph shown in FIG. Therefore, the signal output from the magnetosensitive element 40 swings in the negative direction.
  • the second magnetic pattern of the medium M passes through the position Pc1 shown in FIG.
  • the magnetic field applied to the magnetosensitive element 40 becomes larger than when passing through the position Pb1, so that The electric resistance value of the magnetoresistive pattern of the element 40 is further shifted in the direction indicated by the arrow S2 on the graph shown in FIG. Therefore, the signal output from the magnetosensitive element 40 further swings in the negative direction.
  • the second magnetic pattern of the medium M passes through the position Pd1 shown in FIG. 3A
  • the magnetic field applied to the magnetosensitive element 40 becomes smaller than when passing through the position Pc1, and therefore the magnetosensitive element 40.
  • the electric resistance value of the magnetoresistive pattern returns in the direction opposite to the direction indicated by the arrow S2 on the graph shown in FIG. Therefore, the signal output from the magnetosensitive element 40 returns to the original level.
  • the signal output from the magnetic sensing element 40 is as shown in FIG. Will swing only in the negative direction.
  • the first magnetic pattern made of the hard material of the medium M passes through the position where the permanent magnet 30 and the magnetosensitive element 40 are disposed, the first magnetic pattern also has magnetic permeability.
  • the first signal component L21 (indicated by a dotted line in FIG. 4C) affected by the magnetic permeability of the magnetic pattern of the medium M is referred to FIG. As in the case described above, it swings only in the negative direction.
  • the permeability of the first magnetic pattern is smaller than the permeability of the second magnetic pattern
  • the first signal component L21 affected by the permeability of the magnetic pattern of the medium M is shown in FIG. Is smaller than the change explained.
  • the second signal component L22 (indicated by a one-dot chain line in FIG. 4C) affected by the residual magnetic flux density of the first magnetic pattern of the medium M. ) Swings in the positive and negative directions. More specifically, first, the first magnetic pattern of the medium M has a critical path Rc (residual magnetic flux) in a magnetic field (indicated by a broken line R) formed by the permanent magnet 30 at a position Pb2 shown in FIG. When passing through a magnetic field (determining the density and its direction), it is magnetized in an oblique direction as indicated by an arrow Hp.
  • Rc residual magnetic flux
  • the magnetic field applied to the magnetosensitive element 40 is affected by the residual magnetic flux density of the first magnetic pattern.
  • the magnetic field Ha is smaller than when the medium M does not exist.
  • the electrical resistance value of the magnetoresistive pattern of the magnetosensitive element 40 is shifted in the direction indicated by the arrow S1 on the graph shown in FIG. Accordingly, the second signal component L22 affected by the residual magnetic flux density of the first magnetic pattern of the medium M swings in the positive direction.
  • the magnetic field applied to the magnetosensitive element 40 is affected by the residual magnetic flux density of the first magnetic pattern, Since it becomes larger than the magnetic field Ha when the medium M does not exist, the electric resistance value of the magnetoresistive pattern of the magnetosensitive element 40 shifts in the direction indicated by the arrow S2 on the graph shown in FIG. Therefore, the second signal component L22 affected by the residual magnetic flux density of the first magnetic pattern of the medium M swings in the negative direction.
  • the signal L2 output from the magnetic sensing element 40 is affected by the first signal component L21 affected by the magnetic permeability of the first magnetic pattern of the medium M and the residual magnetic flux density of the first magnetic pattern of the medium M. Is a signal on which the received second signal component L22 is superimposed. Therefore, when the first magnetic pattern of the medium M passes through the position where the permanent magnet 30 and the magnetic sensing element 40 are disposed, the signal output from the magnetic sensing element 40 is as shown in FIG. It will swing in both the positive and negative directions.
  • the permanent magnet 30 generates a magnetic field in a direction along the conveyance direction A1 of the medium M. For this reason, when the medium M passes through the transport path 11, the direction in which the magnetic field at the position where the magnetosensitive element 40 is arranged changes due to the magnetic permeability of the magnetic pattern is only the direction in which it increases. Therefore, the signal output from the magnetic sensing element 40 is affected only by the magnetic permeability of the magnetic pattern of the medium M, and only swings to the positive side or the negative side. On the other hand, when the medium M passes through the transport path 11, the direction in which the magnetic field at the position where the magnetosensitive element 40 is disposed due to the influence of the residual magnetic flux density of the magnetic pattern changes in the permanent magnet 30 or the magnetosensitive element. As the relative position of the medium M with respect to 40 changes, both the direction of strengthening and the direction of weakening are obtained.
  • the permanent magnet 30 is provided with an S pole and an N pole in a direction along the conveyance direction A1 of the medium M. For this reason, the magnetic field of the direction along the conveyance direction A1 of the medium M can be formed with a simple configuration.
  • the magnetosensitive element 40 is disposed between the transport path 11 and the permanent magnet 30. For this reason, the structure which presses the medium M against the magnetic sensitive element 40 with a roller etc. is easily realizable.
  • the permanent magnet 80 has one of the S pole and the N pole (for example, the S pole) on the transport path 11 side (the magnetosensitive element 40 side).
  • the other pole (for example, the N pole) of the S pole and the N pole is directed to the side opposite to the conveyance path 11 (the side opposite to the magnetosensitive element 40). Therefore, the permanent magnet 80 applies a magnetic field Ha substantially perpendicular to the magnetoresistive pattern of the magnetoresistive element used for the magnetosensitive element 40.
  • the magnetic pattern is printed with ink containing a hard material such as ferrite powder and when soft material such as soft magnetic stainless powder (printed with ink containing soft magnetic material) Since the pattern has permeability, the permeability of the magnetic pattern while the medium M passes from the position Pa0 shown in FIG. 10A to the positions Pb0, Pc0, Pd0, Pe0 shown in FIG. 10C. As shown in FIG. 10 (d), the signal component output from the magnetosensitive element 40a due to the swaying in both directions of the negative direction and the positive direction.
  • FIG. 5 is an explanatory diagram of the magnetic sensor device 20 according to the second embodiment of the present invention.
  • the basic configuration of the present embodiment and later-described third, fourth, and fifth embodiments is the same as that of the first embodiment, and therefore, common portions are denoted by the same reference numerals and description thereof is omitted.
  • . 5, 6, and 8 schematically show a magnetic field formed by the permanent magnet 30 with a broken line R.
  • the magnetic sensor device 20 of the present embodiment also has a permanent magnet 30 that forms a magnetic field in the direction along the transport direction A1 of the medium M with respect to the transport path of the medium M, as in the first embodiment.
  • the permanent magnet 30 has a magnetosensitive element 40 disposed in the magnetic field of the permanent magnet 30 on the transport path 11 side.
  • the permanent magnet 30 is provided with an S pole and an N pole in a direction along the conveyance direction A1 of the medium M.
  • the magnetosensitive element 40 is disposed between the conveyance path 11 and the permanent magnet 30 so that at least a part thereof faces the permanent magnet 30.
  • the first magnetic sensing element 41 and the second magnetic sensing element 42 are arranged symmetrically with respect to the center of the permanent magnet 30 in the transport direction A1. For this reason, a similar output can be obtained when the medium M is transported in the transport direction A1 and when the medium M is transported in the transport direction A2 opposite to the transport direction A1. Therefore, signal processing and the like are easy.
  • FIG. 6 is an explanatory diagram of the magnetic sensor device 20 according to the third embodiment of the present invention.
  • FIGS. 6 (a) and 6 (b) are output from the configuration diagram of the magnetic sensor device 20 and the magnetic sensing element 40.
  • FIG. FIG. 7 is an explanatory diagram of an output signal when the magnetic pattern of the medium M is detected using the magnetic sensor device 20 according to the third embodiment of the present invention
  • FIGS. FIG. 4 is an explanatory diagram of an output signal when a magnetic pattern made of a soft material is formed on M, and an explanatory diagram of an output signal when a magnetic pattern made of a hard material is formed on the medium M.
  • the magnetic sensor device 20 also forms a permanent magnetic field in the direction along the transport direction A1 of the medium M with respect to the transport path 11 of the medium M, as in the first embodiment.
  • the magnet 30 and the magnetosensitive element 40 disposed in the magnetic field of the permanent magnet 30 on the transport path 11 side with respect to the permanent magnet 30 are provided.
  • the magnetosensitive element 40 is disposed between the conveyance path 11 and the permanent magnet 30 so that at least a part thereof faces the permanent magnet 30.
  • the magnetosensitive element 40 includes a first magnetosensitive element 41 and a second magnetosensitive element 42 disposed at a position away from the first magnetosensitive element 41 in the transport direction A1.
  • the first magnetosensitive element 41 faces the first permanent magnet 31 on the second permanent magnet 32 side from the center in the transport direction A1 of the first permanent magnet 31
  • the second magnetosensitive element 42 is the second permanent magnet 42. It faces the second permanent magnet 32 on the first permanent magnet 31 side from the center of the conveyance direction A1 of the magnet 32.
  • the end of the first magnetosensitive element 41 on the second magnetosensitive element 42 side is located closer to the second magnetosensitive element 42 than the end of the first permanent magnet 31 on the second permanent magnet 32 side
  • the end of the magnetosensitive element 42 on the first magnetosensitive element 41 side is located closer to the first magnetosensitive element 41 than the end of the second permanent magnet 32 on the first permanent magnet 31 side.
  • the first signal component L1a affected by the magnetic permeability of the magnetic pattern of the medium M among the signals output from the first magnetic sensing element 41 and the second magnetic sensing element 42.
  • L1b (indicated by a dotted line in FIG. 6B) swings in a negative direction with substantially the same change.
  • the second signal component L2a affected by the residual magnetic density of the magnetic pattern of the medium M (indicated by a dashed line in FIG. 6B).
  • the second signal component L2b (indicated by a two-dot chain line in FIG. 6B) affected by the residual magnetic density of the magnetic pattern of the medium M is With the time difference, it will swing in the positive and negative directions.
  • the signal La output from the first magnetosensitive element 41 and the signal Lb output from the second magnetosensitive element 42 are shown in FIG. To change.
  • the signal La output from the first magnetosensitive element 41 and the signal Lb output from the second magnetosensitive element 42 are shown in FIG. ).
  • the first magnetosensitive element 41 and the second magnetosensitive element 42 generate a differential output as in the first embodiment. Therefore, the presence of the magnetic pattern can be detected by using one of the signals from the first magnetosensitive element 41 and the second magnetosensitive element 42. Further, when the differential output between the first magnetosensitive element 41 and the second magnetosensitive element 42 does not appear, it can be detected that the magnetic pattern is made of a soft material, while the first magnetosensitive element 41 and the second magnetosensitive element 41 and the second magnetosensitive element 41 can be detected. When a differential output with the magnetosensitive element 42 appears, it can be detected that the magnetic pattern is made of a hard material.
  • the permanent magnet 30 is in a direction along the conveyance direction A1 of the medium M with respect to the conveyance path 11 of the medium M due to the leakage magnetic flux between the first permanent magnet 31 and the second permanent magnet 32.
  • Form a magnetic field for this reason, the critical path Rc capable of saturating and magnetizing the magnetic pattern of the medium M can be formed in the transport path 11 without using the large permanent magnet 30. Therefore, the distance between the two magnetosensitive elements 40 (the first magnetosensitive element 41 and the second magnetosensitive element 42) can be narrower than when using a large permanent magnet 30 as shown in FIG.
  • the resolution in the transport direction A1 can be increased.
  • FIG. 8 is an explanatory diagram of the magnetic sensor device 20 according to the fourth embodiment of the present invention.
  • the magnetic sensor device 20 of this embodiment also has a permanent magnet 30 that forms a magnetic field in the direction along the conveyance direction A1 of the medium M with respect to the conveyance path 11 of the medium M, as in the first embodiment.
  • the magnetic sensing element 40 is disposed in the magnetic field of the permanent magnet 30 on the conveyance path 11 side with respect to the permanent magnet 30.
  • the magnetosensitive element 40 is disposed between the conveyance path 11 and the permanent magnet 30 so that at least a part thereof faces the permanent magnet 30.
  • the permanent magnet 30 includes a first permanent magnet 31 and a second permanent magnet 32 disposed at a position spaced from the first permanent magnet 31 in the transport direction A1. Further, in both the first permanent magnet 31 and the second permanent magnet 32, the S pole and the N pole are provided in a direction along the conveyance direction A ⁇ b> 1 of the medium M. More specifically, in each of the first permanent magnet 31 and the second permanent magnet 32, an N pole is provided on the upstream side in the transport direction A1, and an S pole is provided on the downstream side. For this reason, a magnetic field in the direction along the conveyance direction A1 of the medium M is formed with respect to the conveyance path 11 of the medium M by the leakage magnetic flux between the first permanent magnet 31 and the second permanent magnet 32.
  • the magnetosensitive element 40 includes a first magnetosensitive element 41 and a second magnetosensitive element 42 disposed at a position spaced from the first magnetosensitive element 41 in the first direction Y.
  • the magnetosensitive element 40 includes a third magnetosensitive element 43 and a first magnetosensitive element 41 that are disposed at positions separated from the first magnetosensitive element 41 and the second magnetosensitive element 42 in the first direction Y.
  • a fourth magnetosensitive element 44 disposed at a position away from the second magnetosensitive element 42 and the third magnetosensitive element 43 in the first direction Y.
  • the first magnetosensitive element 41 faces the first permanent magnet 31 on the second permanent magnet 32 side from the center in the transport direction A1 of the first permanent magnet 31, and the second magnetosensitive element 42 is The first permanent magnet 31 faces the first permanent magnet 31 on the side opposite to the second permanent magnet 32 from the center in the transport direction A1.
  • the end of the first magnetosensitive element 41 opposite to the second magnetosensitive element 42 is opposite to the second magnetosensitive element 42 from the end of the first permanent magnet 31 on the second permanent magnet 32 side. Is located.
  • the entire second magnetosensitive element 42 faces the first permanent magnet 31.
  • the first magnetosensitive element 41 and the second magnetosensitive element 42 configured as described above generate a differential output.
  • the third magnetosensitive element 43 is opposed to the second permanent magnet 32 on the first permanent magnet 31 side from the center in the transport direction A1 of the second permanent magnet 32, and the fourth magnetosensitive element 44 is the second permanent magnet.
  • the second permanent magnet 32 faces the second permanent magnet 32 on the side opposite to the first permanent magnet 31 from the center of the conveying direction A1 of the second 32.
  • the end of the third magnetosensitive element 43 opposite to the fourth magnetosensitive element 44 is opposite to the fourth magnetosensitive element 44 from the end of the second permanent magnet 32 on the first permanent magnet 31 side. Is located.
  • the fourth magnetosensitive element 44 is entirely opposed to the second permanent magnet 32.
  • the third magnetic sensing element 43 and the fourth magnetic sensing element 44 configured as described above generate a differential output.
  • the first magnetic sensitive element 41, the second magnetic sensitive element 42, the third magnetic sensitive element 43, and the fourth magnetic sensitive element 44 are output as in the first embodiment.
  • the first signal component affected by the magnetic permeability of the magnetic pattern of the medium M swings in the negative direction with substantially the same change.
  • the second signal component affected by the residual magnetic density of the magnetic pattern of the medium M has the positive direction and It will swing in the negative direction. Therefore, the same effects as in the third embodiment can be obtained, such as whether the magnetic pattern of the medium M is made of a soft material or a hard material.
  • FIG. 9 is an explanatory diagram of the magnetic sensor device 20 according to the fifth embodiment of the present invention.
  • a plurality of the permanent magnets 30 and the magnetosensitive elements 40 are arranged in the direction intersecting the conveyance direction A1 of the medium M (the third direction X), but in this form, as shown in FIG.
  • the permanent magnet 30 extends in a direction (third direction X) intersecting the conveyance direction A1 of the medium M, and the plurality of magnetosensitive elements 40 face the permanent magnet 30 in the Z direction.
  • the configuration shown in FIG. 2 it is possible to suppress the occurrence of a sensitivity difference depending on the position in the third direction X in the magnetosensitive element 40 due to the influence of the magnetic field formed at the end of the permanent magnet 30. There is an advantage that you can.
  • an anisotropic magnetoresistive element in which a magnetoresistive pattern made of a thin film ferromagnetic metal is formed on the sensor substrate 49 is used as the magnetosensitive element 40.
  • the magnetosensitive element 40 a semiconductor magnetoresistive element, a hole is used.
  • the magnetosensitive element 40 is disposed between the transport path 11 and the permanent magnet 30.
  • the magnetosensitive element 40 is disposed on the opposite side of the transport path 11 from the permanent magnet 30. You may employ

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Measuring Magnetic Variables (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Hall/Mr Elements (AREA)

Abstract

L'invention concerne un dispositif de capteur magnétique qui, en plus de déterminer la présence ou l'absence d'une partie de corps magnétique sur un milieu, est capable de déterminer si la partie de corps magnétique est un matériau magnétique dur ou un matériau magnétique souple. Plus précisément, le dispositif de capteur magnétique 20 est pourvu d'aimants permanents 30 pour former, dans le trajet de transport 11 d'un milieu M, un champ magnétique dans une direction dans le sens de transport A1 du milieu M, et d'éléments sensibles et magnétiques 40 disposés dans le champ magnétique des aimants permanents 30 sur le côté trajet de transport 11 par rapport aux aimants permanents 30. Lorsque le milieu M passe par le trajet de transport 11, la direction dans laquelle le champ magnétique, au niveau des positions dans lesquelles les éléments sensibles magnétiques 40 sont disposés, change en conséquence de l'effet de perméabilité magnétique du motif magnétique (partie de corps magnétique) sur le milieu M, est uniquement la direction d'augmentation de champ magnétique. Par contre, la direction dans laquelle le champ magnétique, au niveau des positions dans lesquelles les éléments sensibles magnétiques 40 sont disposés, change en conséquence de l'effet de densité de flux magnétique résiduel du motif magnétique, est à la fois la direction d'augmentation de champ magnétique et la direction de diminution de champ magnétique. Par conséquent, il est possible de déterminer si le motif magnétique est un matériau magnétique dur ou un matériau magnétique souple sur la base de la sortie provenant des éléments sensibles magnétiques 40.
PCT/JP2016/058782 2015-04-24 2016-03-18 Dispositif de capteur magnétique WO2016170887A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201680023045.8A CN108174610A (zh) 2015-04-24 2016-03-18 磁传感器装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-089685 2015-04-24
JP2015089685A JP2016206070A (ja) 2015-04-24 2015-04-24 磁気センサ装置

Publications (1)

Publication Number Publication Date
WO2016170887A1 true WO2016170887A1 (fr) 2016-10-27

Family

ID=57143075

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/058782 WO2016170887A1 (fr) 2015-04-24 2016-03-18 Dispositif de capteur magnétique

Country Status (3)

Country Link
JP (1) JP2016206070A (fr)
CN (1) CN108174610A (fr)
WO (1) WO2016170887A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023127576A1 (fr) * 2021-12-28 2023-07-06 グローリー株式会社 Dispositif de détection de caractéristiques magnétiques et dispositif d'identification de feuilles de papier

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019049414A1 (fr) * 2017-09-07 2019-03-14 株式会社村田製作所 Capteur magnétique et capteur de courant comprenant ce dernier
CN113589207B (zh) * 2021-08-13 2023-09-22 哈尔滨工业大学 一种电器元件内部扇形永磁体截面磁通间接测量方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07294540A (ja) * 1994-03-02 1995-11-10 Nippondenso Co Ltd 磁気検出装置
WO2012014546A1 (fr) * 2010-07-30 2012-02-02 三菱電機株式会社 Dispositif de détection de substance magnétique
WO2014169698A1 (fr) * 2013-04-16 2014-10-23 无锡乐尔科技有限公司 Tête magnétique pour détecter un champ magnétique sur la surface d'un motif magnétique, basée sur une technologie à magnétorésistance

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2726850B2 (ja) * 1989-02-08 1998-03-11 アイシン精機株式会社 回転検出装置
JP3283931B2 (ja) * 1992-12-11 2002-05-20 グローリー工業株式会社 磁気質検出装置
JP2005030872A (ja) * 2003-07-10 2005-02-03 Toshiba Corp 磁性体量検出装置
CN101672823B (zh) * 2009-10-15 2012-07-25 中钞特种防伪科技有限公司 一种磁性材料在线检测系统和方法
DE102011109949A1 (de) * 2011-08-10 2013-02-14 Giesecke & Devrient Gmbh Prüfanordnung zur Wertdokumentprüfung
JP6034731B2 (ja) * 2013-03-26 2016-11-30 浜松光電株式会社 磁性体検出装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07294540A (ja) * 1994-03-02 1995-11-10 Nippondenso Co Ltd 磁気検出装置
WO2012014546A1 (fr) * 2010-07-30 2012-02-02 三菱電機株式会社 Dispositif de détection de substance magnétique
WO2014169698A1 (fr) * 2013-04-16 2014-10-23 无锡乐尔科技有限公司 Tête magnétique pour détecter un champ magnétique sur la surface d'un motif magnétique, basée sur une technologie à magnétorésistance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023127576A1 (fr) * 2021-12-28 2023-07-06 グローリー株式会社 Dispositif de détection de caractéristiques magnétiques et dispositif d'identification de feuilles de papier

Also Published As

Publication number Publication date
CN108174610A (zh) 2018-06-15
JP2016206070A (ja) 2016-12-08

Similar Documents

Publication Publication Date Title
JP5127440B2 (ja) 磁気パターン検出装置
JP5719515B2 (ja) 磁気センサ装置
JP5945627B2 (ja) 磁気質検出装置
JP6300908B2 (ja) 磁気センサ装置
JP2011163831A5 (fr)
WO2013146755A1 (fr) Dispositif et procédé d'évaluation de magnétisme de feuille de papier
JP4867391B2 (ja) 紙葉類識別センサ
WO2016170885A1 (fr) Dispositif de capteur magnétique
US7427859B2 (en) Moving body detecting apparatus
JP6301709B2 (ja) 磁気質判別装置及び磁気質判別方法
JP2008145379A (ja) 磁気センサ
WO2016170887A1 (fr) Dispositif de capteur magnétique
WO2016170886A1 (fr) Dispositif de capteur magnétique
US10222431B2 (en) Measuring device with pre-magnetizing magnet
JP2006293575A (ja) 紙葉類の識別装置及び識別方法
JP6289775B1 (ja) 磁気センサ装置
JP2012215405A (ja) 磁気センサ装置
JP6328139B2 (ja) 自身の周辺の磁気的な特性を測定するための測定装置
WO2020149375A1 (fr) Capteur d'identification magnétique
JP2006266862A (ja) 磁性粉付着媒体又は磁性膜付着媒体検出装置
WO2017126373A1 (fr) Dispositif de détection de milieu magnétique
JP2008145302A (ja) 磁気センサ
JP2014203396A (ja) 磁気質判別装置及び磁気質判別方法
JP2013217767A (ja) 磁気センサ装置
JP2007144039A (ja) パチンコ玉検出センサ

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: 16782909

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: 16782909

Country of ref document: EP

Kind code of ref document: A1