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WO2010052797A1 - Appareil de détection de propriété magnétique - Google Patents

Appareil de détection de propriété magnétique Download PDF

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Publication number
WO2010052797A1
WO2010052797A1 PCT/JP2008/070411 JP2008070411W WO2010052797A1 WO 2010052797 A1 WO2010052797 A1 WO 2010052797A1 JP 2008070411 W JP2008070411 W JP 2008070411W WO 2010052797 A1 WO2010052797 A1 WO 2010052797A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
quality detection
magnetic field
magnet
divided
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2008/070411
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English (en)
Japanese (ja)
Inventor
直樹 上山
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Glory Ltd
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Glory Ltd
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Publication date
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Priority to PCT/JP2008/070411 priority Critical patent/WO2010052797A1/fr
Priority to JP2010536631A priority patent/JP5242698B2/ja
Publication of WO2010052797A1 publication Critical patent/WO2010052797A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • 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

Definitions

  • the present invention relates to a magnetic quality detection device that detects the magnetism of a paper sheet by transporting a paper sheet printed with magnetic ink along a transport surface, and in particular, accurately detects the difference in coercive force characteristics of the magnetic ink.
  • the present invention relates to a magnetic quality detection device capable of detecting.
  • magnetic ink containing a magnetic material has been used as printing ink for paper sheets such as banknotes and gift certificates from the viewpoint of preventing counterfeiting.
  • a hard magnetic ink having a large coercive force and a soft magnetic ink having a small coercive force are used in combination, and a difference in the coercive force characteristic of each magnetic ink is detected by a magnetic quality detection device.
  • the authenticity of the paper sheet is determined.
  • Patent Document 1 discloses a magnetic quality detection device that detects the magnetic quality of paper sheets printed with hard magnetic ink and soft magnetic ink.
  • the magnetic ink is saturated and magnetized, and an appropriate bias magnetic field is applied to detect the hard magnetic ink and the hard / soft mixed magnetic pattern of the soft magnetic ink.
  • the magnetization of the hard magnetic ink is erased and only the magnetization of the soft magnetic ink remains.
  • the intensity of the bias magnetic field is adjusted so that the residual magnetization of the hard magnetic ink becomes zero in the genuine paper sheet, only the magnetic pattern of the soft magnetic ink is detected in the genuine paper sheet. .
  • the authenticity of the paper sheet can be determined.
  • a magnet etc. are provided in the single side
  • the intensity of the bias magnetic field is adjusted so that the residual magnetization of the hard magnetic ink becomes zero with respect to the direction of the perpendicular to the conveyance surface in the conveyance path (hereinafter referred to as “Y direction”).
  • the residual magnetization in the transport direction (hereinafter referred to as “X direction”) in the transport path is not considered.
  • the direction of the magnetic field lines is not necessarily parallel to the Y direction, and the magnetic field lines pass through the paper sheet at a predetermined angle. That is, an X-direction component exists in the lines of magnetic force in the divergent magnetic field.
  • the residual magnetization of the hard magnetic ink in the Y direction is zero, the residual magnetization of the hard magnetic ink in the X direction is not necessarily zero. Accordingly, there is a problem that the combined residual magnetization in the X direction and the Y direction cannot be accurately set to 0, and the authenticity determination accuracy cannot be sufficiently increased.
  • the present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a magnetic quality detection device capable of accurately detecting a difference in coercive force characteristics of magnetic ink.
  • the present invention provides a magnetic quality detection device for detecting the magnetism of the paper sheet by transporting the paper sheet printed with magnetic ink along the transport surface.
  • a magnet unit in which different poles of magnets are connected by a yoke is disposed at a position facing each other across the transport surface, and the direction of a magnetic vector in the magnetism detection section on the transport surface is the transport surface.
  • magnetic field generating means adjusted so that the magnetic field strength is non-decreasing (monotonically increasing) or non-increasing (monotonically decreasing) with respect to the conveyance direction in the magnetic detection section, and provided in the magnetic detection section And a magnetic quality detecting means.
  • each magnet unit of the magnetic field generating means is arranged so that the magnetic poles of the magnets facing each other across the transport surface are different from each other. .
  • the present invention is the above invention, wherein the magnetic field generation means further includes a plurality of divided magnetic guide plates divided in the transport direction on the transport surface side of each magnet unit, and the magnetic quality detection means The position corresponding to the divided magnetic guide plate is provided closer to the conveying surface than the divided magnetic guide plate.
  • the present invention is characterized in that, in the above-mentioned invention, the magnetic field generating means further comprises a position adjusting mechanism for adjusting a position of the divided magnetic guiding plate in the transport direction.
  • the present invention is the above invention, wherein the magnetic field generation means further includes one magnetic guide plate on the transport surface side of one of the magnet units, and the magnetic quality detection means includes the magnetic guide plate. It is provided closer to the transport surface than the above.
  • the present invention is the above invention, wherein the magnetic field generating means adjusts a distance between the transport surface and the one magnet unit by using the magnetic guide plates having different magnetic conductivities and / or plate thicknesses. It is characterized by.
  • the magnet units in which the different poles of the magnet are connected by the yoke are arranged at positions facing each other across the transport surface, and the direction of the magnetic vector in the magnetism detection section on the transport surface is the same as the transport surface. Since the magnetic field generating means that is vertical and adjusted so that the magnetic field intensity is not decreased or not increased with respect to the conveyance direction in the magnetic detection section, and the magnetic quality detection means provided in the detection section are provided. By transporting the paper sheet at a position where the direction of the magnetic force line is in the perpendicular direction of the paper sheet, it is possible to accurately detect the difference in coercive force characteristics of the magnetic ink.
  • each magnet unit of the magnetic field generating means is arranged so that the magnetic poles of the magnets facing each other across the transport surface are different from each other.
  • the magnetic field generating means further includes a plurality of divided magnetic guiding plates divided in the conveying direction on the conveying surface side of each magnet unit, and the magnetic quality detecting means is provided on the divided magnetic guiding plates. Since the corresponding position is provided closer to the conveyance surface than the divided magnetic guide plate, the magnetic field strength between the magnet units can be changed stepwise by using the divided magnetic guide plate. Thus, there is an effect that it is possible to widen the allowable range of the displacement of the magnetic quality detection means.
  • the magnetic field generating means further includes a position adjusting mechanism that adjusts the position of the divided magnetic guide plate in the transport direction, so that the magnetic field strength between the magnet units can be adjusted. Play.
  • the magnetic field generating means further includes one magnetic guide plate on the transport surface side of one magnet unit, and the magnetic quality detection means is provided closer to the transport surface than the magnetic guide plate.
  • the magnetic field generating means adjusts the distance between the transport surface and one of the magnet units by using magnetic plates having different magnetic conductivities and / or plate thicknesses. There is an effect that the position in the perpendicular direction of the paper sheet can be adjusted in detail.
  • FIG. 1 is a diagram illustrating an outline of the magnetic quality detection device according to the first embodiment.
  • FIG. 2 is a diagram illustrating lines of magnetic force and magnetic field strength distribution generated by the magnetic quality detection apparatus according to the first embodiment.
  • FIG. 3 is a diagram showing saturation magnetization curves of hard magnetic ink and soft magnetic ink and values detected by the MR sensor.
  • FIG. 4 is a diagram illustrating an outline of the magnetic quality detection device according to the second embodiment.
  • FIG. 5 is a diagram illustrating a magnetic force line distribution of the magnetic quality detection device according to the second embodiment.
  • FIG. 6 is a diagram showing the relationship between the thickness and magnetic permeability of the magnetic guide plate and the position of the magnetic field inflection point.
  • FIG. 1 is a diagram illustrating an outline of the magnetic quality detection device according to the first embodiment.
  • FIG. 2 is a diagram illustrating lines of magnetic force and magnetic field strength distribution generated by the magnetic quality detection apparatus according to the first embodiment.
  • FIG. 3 is a diagram showing saturation magnetization curves
  • FIG. 7 is a diagram illustrating a modification of the magnetic quality detection device according to the second embodiment.
  • FIG. 8 is a diagram illustrating an outline of the magnetic quality detection device according to the third embodiment.
  • FIG. 9 is a diagram illustrating lines of magnetic force and magnetic field strength distribution generated by the magnetic quality detection device according to the third embodiment.
  • FIG. 10 is a diagram showing a change in the magnetic field strength distribution when the uppermost divided magnetic guide plate is moved.
  • FIG. 11 is a diagram illustrating a change in magnetic field strength distribution when the most downstream divided magnetic guide plate is moved.
  • FIG. 12 is a diagram showing a modified example of the arrangement of the divided magnetic guide plates.
  • FIG. 13 is a diagram showing the configuration and magnetic field strength distribution of the magnetic quality detection apparatus 1 that supports bidirectional conveyance.
  • FIG. 14 is a diagram showing the configuration and magnetic field strength distribution of the magnetic quality detection apparatus 2 that supports bidirectional conveyance.
  • FIG. 15 is a diagram showing a variation of the paper sheet pressing mechanism.
  • Magnetic quality detection apparatus 101 Conveyance direction 110 Upper unit 111 Yoke 112, 113 Magnet 120 Lower unit 121 Yoke 122, 123 Magnet 124 Substrate 125 MR sensor (MR1) 126 MR sensor (MR2) 200 Magnetic quality detection apparatus 210 Upper unit 211 Yoke 212, 213 Magnet 220 Lower unit 221 Yoke 222, 223 Magnet 224 Substrate 225 MR sensor (MR1) 226 MR sensor (MR2) 227 Magnetic guide plate 300 Magnetic quality detection device 310 Upper unit 311 Yoke 312, 313 Magnet 314a, 314b, 314c, 314d Split magnetic guide plate 320 Lower knit 321 York 322, 323 Magnet 324a, 324b, 324c, 324d Split magnetic guide plate 325 Substrate 326 MR sensor (MR1) 327 MR sensor (MR2)
  • the magnet units are respectively arranged at symmetrical positions across the conveyance path.
  • the single magnetic guide plate is arranged on the conveyance path side of one magnet unit.
  • a case where a plurality of divided magnetic guide plates divided in the transport direction are arranged on the transport path side of both magnet units will be described.
  • FIG. 1 is a diagram illustrating an outline of the magnetic quality detection device 100 according to the first embodiment.
  • the magnetic quality detection apparatus 100 according to the first embodiment includes an upper unit 110 provided above the conveyance path and a lower unit 120 provided below the conveyance path. .
  • the upper unit 110 has a magnetic field generation unit (magnetic field generation means) in which a magnet 112 and a magnet 113 are connected by a yoke 111 in a housing provided with a wear-resistant material on the conveyance path side.
  • the yoke 111 is a member made of a material having a high magnetic conductivity such as permalloy, for example.
  • the magnet 112 and the magnet 113 in the upper unit 110 are provided along the lower surface of the housing, and the magnet 112 is upstream in the transport direction 101 and the magnet 113 is downstream. Are arranged. Magnet 112 and magnet 113 may be configured as permanent magnets or as electromagnets.
  • the lower unit 120 has a magnetic field generating unit (magnetic field generating means) in which a magnet 122 and a magnet 123 are connected by a yoke 121 in a housing provided with a wear-resistant material on the conveyance path side. Further, as shown in the figure, the magnet 122 and the magnet 123 in the lower unit 120 are provided toward the upper surface of the housing, and the magnet 122 is upstream in the transport direction 101 and the magnet 123 is downstream. Are arranged. Note that the magnet 122 and the magnet 123 may also be configured as permanent magnets or electromagnets, similarly to the magnets 112 and 113.
  • a magnetic quality detection unit (magnetic quality detection means) is provided along the upper surface of the housing.
  • the magnetic quality detection unit is configured by providing an MR (MagnetoResistive) sensor (MR1) 125 and an MR sensor (MR2) 126 on a substrate 124.
  • MR1 Magnetic Magnetic Resistive
  • MR2 Magnetic MR sensor
  • the MR sensor refers to a sensor whose resistance value changes in accordance with the magnetic field strength.
  • a Hall sensor, a magnetic impedance sensor, a fluxgate sensor, or the like may be used.
  • the magnet 112 of the upper unit 110 and the magnet 122 of the lower unit 120 face each other across the transport path. Further, the magnet 113 of the upper unit 110 and the magnet 123 of the lower unit 120 are opposed to each other across the conveyance path. Thus, the upper unit 110 and the lower unit 120 form a closed magnetic path with the conveyance path as an air gap.
  • the closed magnetic circuit will be described in more detail.
  • FIG. 2 is a diagram illustrating magnetic field lines and magnetic field strength distribution generated by the magnetic quality detection device 100 according to the first embodiment.
  • (A) of the same figure shows the magnetic force line which the magnetic quality detection apparatus 100 generate
  • the magnet 112 of the upper unit 110 has an S pole on the conveyance path side and an N pole on the yoke 111 side
  • the magnet 122 of the lower unit 120 has an N pole on the conveyance path side and a yoke 121.
  • the side is the S pole.
  • the magnet 113 of the upper unit 110 has an N pole on the conveyance path side and an S pole on the yoke 111 side
  • the magnet 123 of the lower unit 120 has an S pole on the conveyance path side and an N pole on the yoke 121 side.
  • each magnet unit (upper unit 110 and lower unit 120) is provided so that the magnets of the opposing magnet units and the opposite poles face each other.
  • the transfer line 21 is perpendicular.
  • the transport line 21 indicates a position through which the transported paper sheet passes, and the direction of the arrow of the transport line 21 indicates the transport direction.
  • the X-direction component of the magnetic field lines becomes 0 and only the Y-direction component, so that the paper sheets can be magnetized only in the Y direction. Therefore, it is possible to reliably control the magnetization of the subject (paper sheets) and improve the accuracy of coercive force detection.
  • the MR sensor (MR1) 125 and the MR sensor (MR2) 126 are disposed in the vicinity of the conveyance line 21 on the conveyance path sandwiched between the upper unit 110 and the lower unit 120, as shown in FIG. By doing in this way, the residual magnetization of the paper sheets magnetized only by the Y direction component can be acquired with high accuracy.
  • the magnetic field strength in the closed magnetic circuit formed by the upper unit 110 and the lower unit 120 has no inflection point between the positions 23/26 shown in the figure. This is represented as a non-decreasing curve 22.
  • the curve 22 does not have an inflection point from the point 22a to the point 22d, and increases monotonously. In this way, by changing the magnetic field intensity so as not to decrease along the saturation magnetization curve, it becomes possible to accurately detect the residual magnetization of the paper sheets saturated and magnetized at the point 22a.
  • the MR sensor (MR1) 125 and the MR sensor (MR2) 126 are respectively arranged at the position 24 and the position 25 shown in the figure, the points included in the non-decreasing section (between the points 22a and 22d). The residual magnetization at 22b and point 22c is detected.
  • the position 24 of the MR sensor (MR1) 125 and the position 25 of the MR sensor (MR2) 126 can be any positions between the points 22a / 22d.
  • the figure shows the case where two MR sensors detect residual magnetization at two points, the number of MR sensors may be three or more.
  • FIG. 3 is a diagram showing saturation magnetization curves of hard magnetic ink and soft magnetic ink and values detected by the MR sensor. Note that (A) in the figure shows the saturation magnetization curve, and (B) in the figure shows the detection value by the MR sensor.
  • the soft magnetic ink that is in a saturated magnetization state at the point 32a at the position 23 is MR at the point 32b at the position 24 (attachment position of the MR sensor (MR1) 125).
  • the residual magnetization is detected by the sensor (MR1) 125, and the residual magnetization is detected by the MR sensor (MR2) 126 at a point 32c at the position 25 (attachment position of the MR sensor (MR2) 126).
  • the hard magnetic ink that has been in a saturated magnetization state at the point 31a at the position 23 has its residual magnetization detected by the MR sensor (MR1) 125 at the point 31b at the position 24 (attachment position of the MR sensor (MR1) 125).
  • the residual magnetization is detected by the MR sensor (MR2) 126 at a point 31c at the position 25 (attachment position of the MR sensor (MR2) 126).
  • the position 25 (attachment position of the MR sensor (MR2) 126) is adjusted to a position where the magnetization intensity at the point 31c becomes 0 in the case of a genuine paper sheet.
  • the MR sensor (MR2) 126 does not detect the magnetic pattern of the hard magnetic ink in the case of an authentic paper sheet, and detects the magnetic pattern of the hard magnetic ink in the case of an unauthentic paper sheet. Will do.
  • FIG. 5B there are three soft magnetic ink lines and two hard magnetic ink lines so that the magnetic ink pattern of a genuine paper sheet intersects the transport line 21. Suppose that it is attached to paper sheets.
  • the detected value of the MR sensor (MR1) 125 arranged at the position 24 is as shown by a curve 33 in FIG.
  • the MR sensor (MR1) 125 detects both the residual magnetization caused by the soft magnetic ink and the residual magnetization caused by the hard magnetic ink (see 33a in the figure).
  • the detection value of the MR sensor (MR2) 126 arranged at the position 25 is as shown by a curve 34 in FIG. That is, the MR sensor (MR2) 126 detects the residual magnetization due to the soft magnetic ink, but does not detect the residual magnetization due to the hard magnetic ink (see 34a in the figure).
  • the authenticity of the paper sheets can be determined by arranging the MR sensor (MR2) 126 at a position where the residual magnetization of the hard magnetic ink becomes zero.
  • the upper unit 110 is configured so that the X component of the magnetic force lines becomes 0 in the paper sheet conveyance line, that is, the magnetic field lines are orthogonal to the conveyance line. Since the closed magnetic path is formed by the lower unit 120, the position where the residual magnetization of the hard magnetic ink becomes 0 can be accurately estimated.
  • the upper unit and the lower unit are arranged at symmetrical positions with respect to the paper sheet conveyance line, and the closed magnetic path is configured by the upper unit and the lower unit.
  • the magnetic field lines were made to be orthogonal to the paper sheets being conveyed. Therefore, the magnetic field component parallel to the paper sheet is eliminated and the paper sheet is magnetized only by the magnetic field component orthogonal to the paper sheet, so that the residual magnetization of ink having different magnetic characteristics can be accurately acquired. Can do. As a result, the authenticity of the paper sheet can be determined with high accuracy.
  • the residual magnetization of the ink having different magnetic characteristics is detected and the authenticity of the paper sheet is determined based on the detected residual magnetization.
  • the magnetization intensity is changed along the saturation magnetization curve, an absolute magnetic quantity can be detected. Therefore, it is possible to perform authenticity determination based on an absolute magnetic quantity.
  • Example 1 Although it showed about the case where a magnet unit was each arrange
  • FIG. 4 is a diagram illustrating an outline of the magnetic quality detection device 200 according to the second embodiment.
  • the magnetic quality detection apparatus 200 according to the second embodiment includes an upper unit 210 provided above the conveyance path and a lower unit 220 provided below the conveyance path.
  • the lower unit 220 is different from the magnetic quality detection apparatus 100 according to the first embodiment in that the lower unit 220 includes a magnetic guide plate 227.
  • the upper unit 210 includes a yoke 211, a magnet 212, and a magnet 213 in a housing in which a wear-resistant material is provided on the conveyance path side, similarly to the magnetic quality detection device 100 according to the first embodiment.
  • the lower unit 220 includes a yoke 221, a magnet 222, and a magnet 223 in a housing provided with a wear-resistant material on the conveyance path side, and an MR sensor (MR1) 225 and an MR sensor (MR2).
  • MR1 MR1
  • MR2 MR sensor
  • the above-described magnetic guide plate 227 is provided between the substrate 224 provided with H.226, and the magnet 222 and the magnet 223.
  • the magnetic guide plate 227 is attached so as not to contact the magnet 222 or the magnet 223 of the lower unit 220. The reason is that when the magnetic guide plate 227 and the magnet (magnet 222 or magnet 223) are brought into contact with each other, a closed magnetic circuit is formed between these members, and a magnetic field is formed between the upper unit 210 and the lower unit 220. Because it will not be done.
  • the magnetic quality detection apparatus 200 includes the magnetic guide plate 227, so that the position of the line where the magnetic lines of force are perpendicular to the subject (paper sheet) can be drawn toward the lower unit 220 side. That is, according to the magnetic quality detection apparatus 200 according to the second embodiment, the position of the conveyance line where the magnetic force line is only the Y-axis component does not need to be an intermediate point between the upper unit 210 and the lower unit 220.
  • FIG. 5 is a diagram illustrating a magnetic force line distribution of the magnetic quality detection device 200 according to the second embodiment.
  • (A) in the figure shows the magnetic field line distribution of the magnetic quality detection device 200 according to the second embodiment
  • (B) in the same figure shows the magnetic field detection device 100 according to the first embodiment for reference. Magnetic field line distribution is shown respectively.
  • each magnetic field line is only near the lower unit 220 and has only a Y-axis component (parallel to the Y-axis). Therefore, the transport line 51 can be set at a position closer to the lower unit 220.
  • the transport line 51 indicates a position through which the transported paper sheet passes, and the direction of the arrow of the transport line 51 indicates the transport direction.
  • the conveyance line 21 in the magnetic quality detection device 100 according to the first embodiment needs to be provided at an intermediate point between the upper unit 110 and the lower unit 120.
  • the conveyance line 51 in the magnetic quality detection apparatus 200 according to the above can be provided on the surface of the lower unit 220 having the MR sensor. Therefore, the measurement accuracy of residual magnetization by the MR sensor can be improved.
  • the magnetic field lines are only Y-axis components (parallel to the Y-axis). It is possible to change the position.
  • FIG. 6 is a diagram showing the relationship between the thickness and magnetic conductivity of the magnetic guide plate 227 and the position of the magnetic field inflection point.
  • the magnetic field line inflection point refers to a point on the magnetic field line where the magnetic field line is only the Y-axis component (parallel to the Y axis), and the position of the magnetic field line inflection point refers to the magnetic field line inflection point for each magnetic field line.
  • the distance between the connected line and the conveyance surface here, the upper surface of the lower unit 220
  • a wear-resistant material is applied to the upper surface of the lower unit 220.
  • the distance (clearance) between the upper unit 210 and the lower unit 220 is 8.0 mm
  • the distance between the magnetic guide plate 227 and the magnets (magnet 222 and magnet 223) is 0.
  • the line of magnetic force when the distance between the magnetic conducting plate 227 and the upper surface of the lower unit 220 is 1 mm is set to 0.5 mm.
  • (B) in the figure shows a graph showing the relationship between the distance (d) between the magnetic field inflection point and the conveying surface and the thickness (T) of the magnetic guide plate 227, and the magnetic permeability ( This is shown for each ⁇ ).
  • the graph representing the relationship between the distance (d) and the thickness (T) is a curve 61 when the magnetic permeability ( ⁇ ) is 50, and a curve 62 when the magnetic permeability ( ⁇ ) is 100.
  • the curve 63 is obtained.
  • the curve 64 is obtained when the magnetic permeability ( ⁇ ) is 500
  • the curve 65 is obtained when the magnetic permeability ( ⁇ ) is 1000.
  • the distance (d) tends to decrease as the magnetic permeability ( ⁇ ) increases and the thickness (T) increases. In other words, the distance (d) tends to increase as the magnetic permeability ( ⁇ ) decreases and the thickness (T) decreases.
  • the thickness (T) of the magnetic guide plate 227 is about 0.3 mm to 2.0 mm.
  • the magnetic permeability ( ⁇ ) and the thickness (T) are set so that the magnetic permeability ( ⁇ ) is about 100 to 500 and the distance (d) becomes zero. It can be seen that it is sufficient to select.
  • the position of the inflection point of the magnetic lines of force can be adjusted near the upper surface of the lower unit 220.
  • the yoke 211, the magnet 212, and the magnet 213 constitute the upper unit 210, and the magnet 212 and the magnet 213 are arranged on the conveyance path side.
  • the magnetic field strength in the conveyance path may be increased as shown in the following example.
  • FIG. 7 is a diagram illustrating a modification of the magnetic quality detection device 200 according to the second embodiment.
  • a yoke 81 is further provided on the conveyance path side of the magnet 212 in the upper unit 210.
  • the magnetic field strength between the lower unit 220 and the magnet 222 can be increased.
  • the magnetism for saturation magnetization of the paper sheet 500 can be enhanced.
  • the conveyance line 82 points to the position through which the conveyed paper sheet passes, and the direction of the arrow of the conveyance line 81 indicates the conveyance direction.
  • Example 2 the position of the inflection point of the lines of magnetic force is made closer to the upper surface of the lower unit by arranging a single magnetic guide plate on the conveyance path side of the lower unit.
  • the position of the inflection point of the lines of magnetic force was adjusted by changing the thickness of the magnetic guide plate and the magnetic permeability. Therefore, the MR sensor of the lower unit can detect the residual magnetization of the paper sheet with high accuracy. In addition, the size of the magnetic quality detection device can be reduced.
  • Example 3 a case where a plurality of divided magnetic guide plates are used will be described.
  • FIG. 8 is a diagram illustrating an outline of the magnetic quality detection device 300 according to the third embodiment.
  • the magnetic quality detection apparatus 300 according to the third embodiment includes an upper unit 310 provided above the conveyance path and a lower unit 320 provided below the conveyance path.
  • the upper unit 310 includes a plurality of divided magnetic guide plates (314a, 314b, 314c and 314d)
  • the lower unit 320 also includes a plurality of divided magnetic guide plates (324a, 324b, 324c and 324d). It differs from the magnetic quality detection apparatus 100 which concerns.
  • the divided magnetic guide plate 314a of the upper unit 310 is opposed to the divided magnetic guide plate 324a of the lower unit 320 across the conveyance path.
  • the divided magnetic guide plate 314b and the divided magnetic guide plate 324b, The divided magnetic plate 314c and the divided magnetic plate 324c, and the divided magnetic plate 314d and the divided magnetic plate 324d face each other.
  • the magnetic field strength between the upper unit 310 and the lower unit 320 can be changed in a stepped manner, and the allowable range of the MR sensor installation position deviation can be widened. Is possible.
  • the upper unit 310 includes a yoke 311, a magnet 312, and a magnet 313 in a housing provided with a wear-resistant material on the conveyance path side.
  • the divided magnetic guide plate 314 a is disposed on the conveyance path side of the magnet 312. Are provided with divided magnetic guide plates 314d on the conveying path side of the magnet 313, respectively. Further, between the magnet 312 and the magnet 313, there are divided magnetic guide plates 314b and divided magnetic guide plates 314c so as to be parallel to the divided magnetic guide plates 314a and 314d.
  • the lower unit 320 has a yoke 321, a magnet 322, and a magnet 323 in a housing provided with a wear-resistant material on the conveyance path side.
  • the divided magnetic guide plate 324 a is disposed on the conveyance path side of the magnet 322.
  • a substrate 325 provided with an MR sensor (MR 1) 326 and an MR sensor (MR 2) 327 is provided near the upper surface in the lower unit 320.
  • FIG. 9 is a diagram illustrating magnetic field lines and magnetic field strength distribution generated by the magnetic quality detection device 300 according to the third embodiment.
  • (A) in the figure shows the lines of magnetic force generated by the magnetic quality detection device 300
  • (B) in the figure shows the magnetic field strength distribution.
  • the magnet 312 of the upper unit 310 has an S pole on the conveyance path side and an N pole on the yoke 311 side
  • the magnet 322 of the lower unit 320 has an N pole on the conveyance path side and a yoke 321.
  • the side is the S pole.
  • the magnet 313 of the upper unit 310 has an N pole on the conveyance path side and an S pole on the yoke 311 side
  • the magnet 323 of the lower unit 320 has an S pole on the conveyance path side and an N pole on the yoke 321 side.
  • each magnet unit (upper unit 310 and lower unit 320) is provided such that the magnets of the opposing magnet unit and the opposite poles face each other, so that each magnetic field line is opposed to the opposing upper unit 310 and lower unit. It becomes perpendicular to the conveyance line 501 at an intermediate point 320.
  • the transport line 501 indicates a position through which the transported paper sheet passes, and the direction of the arrow of the transport line 501 indicates the transport direction.
  • the X-direction component of the magnetic field lines becomes 0 and only the Y-direction component, so that the paper sheets can be magnetized only in the Y direction. Therefore, it is possible to reliably control the magnetization of the subject (paper sheets) and improve the accuracy of coercive force detection.
  • the MR sensor (MR1) 326 is in a region between the divided magnetic guide plates 314b / divided magnetic guide plates 324b
  • the MR sensor (MR2) 327 is in a region between the divided magnetic guide plates 314c / divided magnetic guide plates 324c.
  • Each is arranged. This is because the change in the magnetic field intensity becomes gentle in the region sandwiched between the opposed divided magnetic guide plates. This point will be described in more detail with reference to FIG.
  • the magnetic field strength in the closed magnetic path formed by the upper unit 310 and the lower unit 320 is expressed as a curve 502 having no inflection point on the downstream side of the position 503. Further, in the vicinity of the position 504 and the position 505, the change in the magnetic field strength is stagnant (in a step shape).
  • the MR sensor (MR1) 326 is attached at the position 504, and acquires the magnetic field strength at the point 502b.
  • the magnetic field strength hardly changes. Therefore, even if the mounting position of the MR sensor (MR1) 326 is not accurately set to the position 504, it is possible to detect a magnetic field strength equivalent to that when the MR sensor (MR1) 326 is installed at the position 504.
  • the MR sensor (MR2) 327 is attached at a position 505 and acquires the magnetic field strength at the point 502c, but the mounting displacement of the MR sensor (MR2) 327 is also caused by the MR sensor (MR1) 326. It is allowed for the same reason as the case.
  • the magnetic field strength distribution between the upper unit 310 and the lower unit 320 can be changed by shifting the position of the divided magnetic guide plate to the upstream side or the downstream side in the transport direction. Therefore, hereinafter, changes in the magnetic field strength distribution accompanying the movement of the divided magnetic guide plates will be described with reference to FIGS. 10 and 11.
  • FIG. 10 is a diagram showing a change in magnetic field strength distribution when the most upstream divided magnetic guide plate (the divided magnetic guide plate 314a and the divided magnetic guide plate 324a) is moved.
  • the case shown in FIG. 10B is the default position, and in this case, the distance between each divided magnetic guide plate is 0.5 mm, 1.5 mm, and 0.5 mm from the left in FIG. .
  • a position adjusting mechanism 111 is attached to each of the divided magnetic guide plates 314a and the divided magnetic guide plates 324a.
  • the position adjusting mechanism 111 is connected to, for example, a screw 111b, a fixed plate 111a that fixes the position of the screw 111b while allowing the screw 111b to rotate, and the divided magnetic guide plate 314a or the divided magnetic guide plate 324a.
  • a connecting member 111c that can change the relative distance from the fixed plate 111a by the rotation.
  • (E) in the figure shows curves indicating changes in magnetic field intensity corresponding to (A) to (D), respectively.
  • the curve 511 corresponds to (A)
  • the curve 512 corresponds to (B)
  • the curve 513 corresponds to (C)
  • the curve 514 corresponds to (D).
  • the magnetic field strength distribution can be adjusted by changing the interval between the divided magnetic guide plates.
  • FIG. 11 is a diagram showing a change in magnetic field strength distribution when the most downstream divided magnetic guide plate (divided magnetic guide plate 314d and divided magnetic guide plate 324d) is moved.
  • the case shown in FIG. 11C is the default position, and in this case, the distance between each divided magnetic guide plate is 0.5 mm, 1.5 mm, and 0.5 mm from the left in FIG. .
  • the position adjusting mechanism 111 shown in FIG. 10 is connected to the divided magnetic guide plates 314d and 324d.
  • (E) in the figure shows curves indicating changes in magnetic field intensity corresponding to (A) to (D), respectively.
  • the curve 521 corresponds to (A)
  • the curve 522 corresponds to (B)
  • the curve 523 corresponds to (C)
  • the curve 524 corresponds to (D).
  • the magnetic field strength distribution can be adjusted by changing the interval between the divided magnetic guide plates.
  • FIGS. 10 and 11 show the case where the most upstream and the most downstream divided magnetic guide plates are moved, other divided magnetic guide plates may be moved. Further, the number adjusting mechanism for detachably fixing each divided magnetic guide plate may be used, and the number of the divided magnetic guide plates may be adjusted.
  • FIG. 12 is a diagram showing a modified example of the arrangement of the divided magnetic guide plates. As shown in the figure, even if the divided magnetic guide plates are arranged so as not to be parallel to the conveyance direction, a conveyance line (see the arrow in the figure) in which each magnetic field line is parallel to the Y axis can be obtained.
  • the magnetic quality detection apparatus 300 with the conveyance direction fixed has been described so far, but the magnetic quality detection apparatus 300 corresponding to bidirectional conveyance may be configured. Therefore, hereinafter, the magnetic quality detection device 300 corresponding to the bidirectional conveyance will be described with reference to FIGS. 13 and 14.
  • FIG. 13 is a diagram showing the configuration and magnetic field strength distribution of the magnetic quality detection apparatus 1 corresponding to bidirectional conveyance.
  • (A) in the figure shows the lines of magnetic force generated by the magnetic quality detection device 300a
  • (B) in the figure shows the magnetic field strength distribution.
  • the magnetic quality detection device 300a has a shape in which the magnetic quality detection device 300 shown in FIG. 9 is connected by being inverted at a position 542 shown in FIG.
  • the magnetic quality detection apparatus 300a is comprised from the upper unit 310a and the lower unit 320a.
  • the transport line is located at the position of the double arrow shown in the figure, and the direction of each magnetic force line is parallel to the Y axis on the transport line.
  • the curve 544 showing the change in the magnetic field strength is represented as a non-decreasing graph having no inflection points in the section from the position 541 to the position 542.
  • the curve 544 is represented as a non-increasing graph having no inflection points in the section from the position 542 to the position 543.
  • MR sensors “MR1” and “MR2” shown in the figure are used to convey the paper sheets from right to left in the figure.
  • FIG. 14 is a diagram showing the configuration and magnetic field intensity distribution of the magnetic quality detection apparatus 2 that supports bidirectional conveyance.
  • (A) in the figure shows the lines of magnetic force generated by the magnetic quality detection device 300b
  • (B) in the figure shows the magnetic field strength distribution.
  • the magnetic quality detection device 300b has a shape obtained by removing the wall at the central portion from the magnetic quality detection device 300a shown in FIG.
  • the magnetic quality detection device 300a includes an upper unit 310b and a lower unit 320b.
  • a conveyance line becomes a position of the double arrow shown in the same figure, and the direction of each magnetic force line becomes parallel to a Y-axis on this conveyance line.
  • the curve 554 showing the change in the magnetic field strength is represented as a non-decreasing graph having no inflection point in the section from the position 551 to the position 552, and the position 552 to the position 553. In this section, it is expressed as a non-increasing graph with no inflection points.
  • the magnetic quality detection apparatus 300b since the magnetic quality detection apparatus 300b has a symmetric shape with respect to the position 552, it can cope with bidirectional conveyance.
  • the MR sensors “MR1” and “MR2” shown in the figure are used to convey the paper sheets from right to left in the figure.
  • a plurality of divided magnetic guide plates are arranged on the conveyance path side of the upper unit, and a plurality of divided magnetic guide plates are arranged on the conveyance path side of the lower unit.
  • the change of the magnetic field strength between the lower units can be stepped. Therefore, it is possible to widen the allowable range of MR sensor mounting deviation. Further, the magnetic field strength distribution can be adjusted by changing the position of the divided magnetic guide plates or changing the number of the divided magnetic guide plates.
  • FIG. 15 is a diagram showing a variation of the paper sheet pressing mechanism.
  • (A) in the figure shows the paper sheet pressing mechanism added to the magnetic quality detection apparatus 300 according to the third embodiment
  • (B) in the same figure and (C) in the same figure show the paper sheet holding mechanism.
  • the paper sheet holding mechanism added to the magnetic quality detection apparatus 200 according to Example 2 is shown.
  • Also shown in the drawing are a paper sheet 500, a transport direction 501 of the paper sheet 500, and a wear resistant plate 502 made of a wear resistant material provided on the upper surface (conveying path side) of the lower unit 320 or the lower unit 220. Show.
  • the distance between the upper unit 310 and the lower unit 320 is larger than that of the magnetic quality detection device 200 according to the second embodiment. Need to be narrow. This is because a magnetic field inflection point exists at an intermediate position between the upper unit 310 and the lower unit 320, and therefore, the transport position of the paper sheet 500 needs to be near the magnetic field inflection point position.
  • the pressing spring 71 is used as a paper sheet pressing mechanism as shown in FIG.
  • the pressing spring 71 is fixed by a pin 72 and presses the conveyed paper sheet 500 against the upper surface of the lower unit 220.
  • pressing with a leaf spring such as the pressing spring 71 tends to cause jam (paper jam) during high-speed conveyance of paper sheets.
  • the magnetic quality detection device 200 if used, the magnetic field inflection point position is adjusted near the upper surface of the lower unit. Therefore, the distance between the upper unit 210 and the lower unit 220 can be increased. Thereby, the arm with a roller with a high pressing effect with respect to the paper sheet 500 can be used as a paper sheet pressing mechanism.
  • the arm with roller is configured by attaching a roller 75 to the arm 73.
  • the arm 73 that supports the roller 75 with the roller shaft 76 is attached so as to rotate around the arm shaft 74, and one end of the arm 73 is fixed to the pin 77 via the spring 78. .
  • the arm with a roller When such an arm with a roller is used, the arm with a roller may move to a position indicated by a broken line in the figure (see 73a in the figure). Therefore, as shown in FIG. 5B, the upper unit 210 needs to be provided at a position where it does not contact the arm with roller. For this reason, as shown in (B) of the same figure, it is necessary to make the space
  • the lower surface of the upper unit 210 is recessed on the lower side so as to avoid contact with the arm with rollers, and the mounting position of the upper unit 210 is changed to the position shown in FIG.
  • the mounting position of the upper unit 210 in B) may be closer to the conveyance path side than the attachment position (see 79 in the figure).
  • the magnetic quality detection device is useful when it is desired to accurately detect the difference in coercive force characteristics of magnetic ink.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Measuring Magnetic Variables (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

L'invention porte sur un appareil de détection de propriété magnétique, dans lequel une unité supérieure et une unité inférieure sont disposées en des positions symétriques par rapport à la chaîne de transporteur de feuilles de papier de façon à constituer un trajet magnétique fermé comprenant l'unité supérieure et l'unité inférieure, de telle sorte que des lignes magnétiques sur la chaîne de transporteur sont orthogonales aux feuilles de papier qui sont transportées. Sur le côté du trajet de transport de l'unité inférieure, une plaque pleine perméable magnétique est disposée de façon à déplacer la position du point d'inflexion des lignes magnétiques pour la rapprocher de la surface supérieure de l'unité inférieure, et l'épaisseur et la perméance magnétique de la plaque perméable magnétique sont changées afin d'ajuster la position du point d'inflexion des lignes magnétiques. De plus, une pluralité de plaques perméables magnétiques divisées est disposée sur le côté du trajet de transport de l'unité supérieure, et une pluralité de plaques perméables magnétiques divisées est disposée sur le côté du trajet de transport de l'unité inférieure.
PCT/JP2008/070411 2008-11-10 2008-11-10 Appareil de détection de propriété magnétique Ceased WO2010052797A1 (fr)

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JP2010536631A JP5242698B2 (ja) 2008-11-10 2008-11-10 磁気質検出装置

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JP2017133845A (ja) * 2016-01-25 2017-08-03 株式会社ヴィーネックス 磁気センサ装置
WO2017191823A1 (fr) * 2016-05-06 2017-11-09 三菱電機株式会社 Dispositif de capteur magnétique
WO2020059577A1 (fr) 2018-09-19 2020-03-26 日本製鉄株式会社 Dispositif de refroidissement de tôles d'acier laminées à chaud et procédé de refroidissement de tôles d'acier laminées à chaud
WO2021199757A1 (fr) * 2020-03-30 2021-10-07 三菱電機株式会社 Dispositif capteur magnétique
JP6980166B1 (ja) * 2020-03-30 2021-12-15 三菱電機株式会社 磁気センサ装置
US11639974B1 (en) 2020-03-30 2023-05-02 Mitsubishi Electric Corporation Magnetic sensor device

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