JP6574710B2 - Magnetic sensor device - Google Patents

Description

  The present invention relates to a magnetic sensor device for detecting a magnetic material contained in paper sheets such as banknotes and securities.

  Various types of long magnetic sensor devices have been put to practical use as magnetic sensor devices for identifying paper sheets containing a predetermined magnetic pattern with magnetic ink or the like.

  A conventional magnetic sensor device includes, as main components, a magnetic field generation unit for magnetizing a magnetic body included in a paper sheet, a magnetoelectric conversion element that converts the magnetic field strength of the magnetized magnetic body into a voltage, and the like. A detection unit that detects an output from the magnetoelectric conversion element, and the detection unit detects a magnetic substance contained in the paper sheet.

  In the above-described magnetic field generation unit, a magnetic field (referred to as a bias magnetic field) is generated on a paper sheet conveyance path, usually by a permanent magnet or an electromagnetic coil. As the magnetoelectric conversion element, a magnetoresistive element, a magnetic head, a Hall element, or the like is used. The magnetoelectric conversion element is installed in the bias magnetic field, and when the paper sheet passes through the vicinity thereof, the magnetic field contained in the paper sheet changes the bias magnetic field, so that its output changes. The magnetic material is detected by detecting this output signal.

  In addition, recently forged banknotes and securities have become increasingly sophisticated, making it difficult to distinguish between authenticity and authenticity. On the other hand, in order to prevent forgery and identify authenticity, various advanced security measures are applied to paper sheets. For example, a magnetic material having a fine print pattern is arranged on a paper sheet, or a plurality of magnetic materials having different magnetic characteristics are arranged.

  As shown in Patent Document 1, a conventional magnetic array sensor has a holding case that holds a magnetoelectric conversion element and a magnetic field generation unit, and the magnetoelectric conversion element is arranged on the top surface side of the holding case. At this time, a pin or the like protruding from the bottom surface of the resin case is used as an external input / output terminal for connecting the magnetoelectric conversion element and the detection unit. In order to connect this external input / output pin terminal to the magnetoelectric conversion element, the pin terminal has a shape penetrating the resin case from the bottom surface to the top surface. On the top surface, the pin terminal and the magnetoelectric conversion element are made conductive. A shape connected by a lead terminal made of a material is used.

JP 2010-175490 A JP-A-11-101658

  In the conventional magnetic sensor device, since each magnetoelectric conversion element is large and the number of elements is small, the number of connecting pins between the magnetoelectric conversion elements arranged on a straight line is small, and the pitch is relatively large. However, in order to detect a fine magnetic substance on the entire surface of the paper sheet, it is necessary to make each magnetoelectric conversion element small and to reduce the pitch between the elements. In addition, if the normal reading positions of the plurality of magnetoelectric transducers are different in the orthogonal direction with respect to the transport direction of the paper sheet, the detection waveform is also different, so positioning accuracy is important.

  However, for that purpose, not only miniaturization of each magnetoelectric conversion element but also the number of magnetoelectric conversion elements is increased. Therefore, in the method of connecting the magnetoelectric conversion element and the detection circuit by the pin terminal, it is necessary to connect the magnetoelectric conversion element and the detection circuit. It was difficult. In Patent Document 2, a magnetoelectric conversion element (a magnetic detection element in the expression of this document) and a magnet are held by a holding member, and the holding member has a gap between the case and the magnetoelectric conversion element in the case. The holding member includes a holding piece that elastically holds the magnetoelectric conversion element, and the connection between the magnetoelectric conversion element and the detection circuit is connected by a flexible circuit board. ing. However, in this method, the holding piece that holds the magnetoelectric conversion element needs to hold the magnetoelectric conversion element from both sides, but holds it when the number of elements of the magnetoelectric conversion element increases in the direction orthogonal to the transport direction. I can't. In addition, the output of the magnetic sensor is adversely affected by the influence of vibration and impact from the paper sheets conveyed on the conveyance path.

  The present invention has been made in view of the above circumstances, and provides a magnetic sensor device capable of connecting a magnetoelectric conversion element and a detection unit even when the number of magnetoelectric conversion elements is increased and the number of external input / output terminals is large. For the purpose.

  A magnetic sensor device according to the present invention is a magnetic sensor device that detects a magnetic body contained in a paper sheet conveyed on a conveyance path, the magnetic field generation unit generating a magnetic field in the conveyance path, and the magnetic field generation unit A plurality of magnetoelectric transducers that convert the intensity of the magnetic field generated by the electric signal into an electric signal in a direction perpendicular to the direction in which the paper sheet is transported, the sensor unit, and the plurality of magnetoelectric transducers A holding substrate having a circuit pattern with respect to input / output signals from, a detection unit for detecting a magnetic substance contained in a paper sheet based on a signal input from the holding substrate, and holding the holding substrate and a magnetic field generation unit. A holding case for fixing the holding substrate and the magnetic field generation unit, and a connection unit for connecting the sensor unit and the detection unit with a flexible flexible substrate covered with a polyimide material.

  In addition, the magnetic sensor device includes a protective cover that protects the sensor unit from paper sheets that are transported on a transport path, and the protection substrate and the protection around the sensor unit so that the protective cover and the sensor unit do not contact each other. A spacer for fixing the cover is provided, and the spacer and the holding substrate are fixed by an elastic member. By doing so, it is possible to suppress vibrations and impacts of the sensor unit from the paper sheets transported along the transport path, and to obtain a highly accurate sensor output.

  Further, the connecting portion is bonded and fixed to the holding case so that the flexible substrate does not receive electromagnetic induction from the magnetic field generating portion. By doing so, it is possible to obtain a highly accurate sensor output without the flexible substrate being affected by electromagnetic induction due to the vibration or impact of the magnetic field generation unit.

  The holding case includes a plurality of positioning protrusions for positioning the holding substrate with respect to the magnetic field generation unit, and the holding substrate is configured to have a positioning hole into which the positioning protrusion is inserted.

  According to such a configuration, even if a plurality of magnetoelectric conversion elements are small and the number of elements is large, signals from each of the magnetoelectric conversion elements can be connected to the detection unit and are held in the positioning holes formed in the holding substrate. The holding substrate and the magnetic field generator can be easily positioned by simply inserting the positioning protrusions of the case. That is, even if the plurality of magnetoelectric conversion elements are small and the number of elements is large, the positional relationship between each magnetoelectric conversion element and the magnetic field generation unit can be easily assembled with high accuracy. The connecting part may be directly bonded and fixed to the magnetic field generating part.

  In addition, the magnetoelectric transducers arranged in the magnetic field may be orthogonal to the direction of the transport path as long as they are in the magnetic field generated by the magnetic field generator, and may not be in a straight line. Like, it may be arranged on a plurality of straight lines.

  Furthermore, the holding substrate for holding the sensor unit is configured by a flexible substrate covered with a polyimide material, and is integrated with the flexible substrate connected to the detection unit.

  According to such a configuration, without connecting the holding substrate and the flexible substrate with a connector or the like, a large number of magnetoelectric conversion elements are reflow-mounted on the flexible substrate, and the magnetoelectric conversion elements are directly integrated into the detection unit by the flexible substrate. It becomes possible to connect. Further, since the magnetoelectric conversion element is always fixed to the holding case, it is possible to always obtain a stable output of the magnetoelectric conversion element. Note that the periphery of the magnetoelectric conversion element of the flexible substrate may be formed of a solder resist material having a small thermal expansion, and the magnetoelectric conversion element is formed of the solder resist, so that the position shift of the periphery of the magnetoelectric conversion element due to temperature change is unlikely to occur. Become.

  Furthermore, the flexible substrate and the detection unit are connected by a connector. By doing so, it is possible to easily connect the flexible substrate and the detection unit, and the assembly work and maintenance work of the magnetic sensor device can be simplified. At this time, the connection between the flexible substrate and the detection unit is not limited to the connector connection, and any connection may be used as long as it can be easily crimped.

  Further, the flexible substrate has an end on the detection unit side divided into a plurality of connection pieces, and each of the plurality of connection pieces is connected to the detection unit.

  According to such a configuration, the end portion on the detection portion side of the flexible substrate is divided into a plurality of connection pieces, so that deformation due to thermal expansion or the like occurs compared to the case where the end portion is not divided. Hateful. Thereby, since the influence which the deformation | transformation of the said edge part has on the edge part of the other side (magnetoelectric conversion element side) can be suppressed, the position shift of each magnetoelectric conversion element by deformation | transformation of a flexible substrate, etc. do not arise easily.

  According to the present invention, a plurality of small magnetoelectric transducers can be arranged with a fine pitch with high precision, and can be connected even if the number of input / output terminals of the magnetoelectric transducers and detectors is increased. It is possible to realize a magnetic sensor device that can manufacture the distance between the section, the conveyance path, and the magnetoelectric conversion element in a compact manner. Thereby, the magnetic substance contained in the paper sheet can be detected with high resolution and high accuracy.

1 is a schematic cross-sectional view of a magnetic sensor device 1 according to a first embodiment of the present invention. It is sectional drawing which shows schematically the mode of the structure of the magnetic sensor apparatus 1 which concerns on 1st Embodiment of this invention, and the magnetic field which generate | occur | produces in it. 1 is a schematic perspective view showing a part of a magnetic sensor device 1 according to a first embodiment of the present invention. It is the schematic plan view which expanded and showed the holding substrate partially. FIG. 4B is a schematic bottom view of the holding substrate of FIG. 4A. It is sectional drawing which shows schematically the mode of the structure of the magnetic sensor apparatus 1 which concerns on 2nd Embodiment of this invention, and the magnetic field which generate | occur | produces in it. It is the schematic perspective view which showed a part of magnetic sensor apparatus 1 which concerns on 2nd Embodiment of this invention.

<First Embodiment>
FIG. 1 is a schematic cross-sectional view of a magnetic sensor device 1 according to a first embodiment of the present invention. A magnetic pattern M is printed on the paper sheet S using, for example, magnetic ink, a magnetic thread, and the like. The magnetic sensor device 1 detects the magnetic pattern M included in the paper sheet S. .

  The conveyance path 2 is formed with a gap G and a width slightly larger than the width of the paper sheet S toward the conveyance direction D1. The paper sheet S is fed into the transport path 2 by the upstream transport roller 21 and further transported toward the downstream transport roller 22 by the sensor facing roller 23 facing the magnetic sensor device 1. The sensor facing roller 23 also has a function of pushing down toward the direction D3 so that the paper sheet S approaches the magnetic sensor device 1. In this way, the magnetic material of the paper sheet S is detected while the paper sheet S passes over the magnetic sensor device 1. Next, the paper sheet S is discharged from the conveyance path by the downstream conveyance roller 22.

FIG. 2 is a cross-sectional view schematically showing the configuration of the magnetic sensor device 1 and the state of the magnetic field generated therein. FIG. 3 is a schematic perspective view showing the magnetic sensor device 1.
The magnetic field generation unit 3 is usually composed of a permanent magnet and forms a bias magnetic field. In this example, the magnetic field generator 3 is provided under the magnetoelectric transducer 4 so that the N pole is on the upper side and the S pole is on the lower side. A loop-shaped magnetic flux as shown in FIG. 2 is formed around the magnetic field generation unit 3, and in particular, in the vicinity of the magnetoelectric conversion element 4, it is perpendicular to the transport direction of the paper sheet S (see FIG. 1). A bias magnetic field is formed.

  The magnetoelectric conversion element 4 is composed of a Hall element. A plurality of Hall elements are provided in the bias magnetic field, and a plurality of Hall elements are provided to detect a magnetic flux formed in the direction D3 orthogonal to the paper sheet S. The plurality of magnetoelectric conversion elements 4 constitutes a sensor unit 40 and converts the intensity of the bias magnetic field generated by the magnetic field generation unit 3 into an electric signal. When the paper sheet S passes over the magnetoelectric conversion element 4, the bias magnetic field is changed by the magnetic material included in the paper sheet S. The magnetoelectric conversion element 4 detects the changed bias magnetic field.

  In the present embodiment, the pitch between the magnetoelectric transducers 4 along the width direction D2 is set to 0.5 mm to 3 mm. The pitch is set below the magnetic field detection range in the D2 direction of the magnetoelectric transducer 4. Thereby, when the paper sheet S is conveyed, the magnetic field change of the whole surface of the paper sheet S can be detected without a gap.

  The plurality of magnetoelectric conversion elements 4 are held by a holding substrate 5. The holding substrate 5 is a printed circuit board in which a circuit pattern is printed with a conductive foil such as a copper foil on the surface of a rigid substrate formed of an insulating resin such as a glass epoxy resin. A plurality of magnetoelectric transducers 4 and a connector 51 for electrically connecting the holding substrate 5 to other members are mounted on the surface of the holding substrate 5 in the present embodiment.

  A detection unit 7 is connected to the holding substrate 5 via a flexible substrate 6. That is, one end portion of the flexible substrate 6 is detachably connected to the connector 51 mounted on the holding substrate 5, and the other end portion of the flexible substrate 6 is connected to the connector 71 mounted on the drive substrate constituting the detection unit 7. By being detachably connected, the circuit on the holding substrate 5 and the detection unit 7 are electrically connected.

  A driving voltage is applied to each magnetoelectric conversion element 4 from the detection unit 7 via the flexible substrate 6, and an output signal from each magnetoelectric conversion element 4 is input to the detection unit 7 via the flexible substrate 6. The detection unit 7 takes out only the change in the bias magnetic field due to the magnetic material contained in the paper sheet S from the output of the magnetoelectric conversion element 4 and detects the magnetic material of the paper sheet S with high accuracy.

  The flexible substrate 6 is a flexible printed circuit board, and has a configuration in which a conductive foil such as a copper foil is covered with a polyimide material that is a film-like insulator. The flexible substrate 6 constitutes a connection unit 60 that connects the sensor unit 40 (magnetoelectric conversion element 4) and the detection unit 7. In the present embodiment, a plurality of magnetoelectric transducers 4 are collectively connected to the detection unit 7 by a single flexible substrate 6. Thereby, as compared with a configuration in which each magnetoelectric conversion element 4 is individually connected to the detection unit 7 by wiring, a large number of magnetoelectric conversion elements 4 can be arranged and connected to the detection unit 7.

  With this configuration, since the plurality of magnetoelectric conversion elements 4 are provided separately from the detection unit 7, these magnetoelectric conversion elements 4 are relatively narrow between the transport path 2 and the magnetic field generation unit 3. It becomes possible to provide in a space.

  Further, the end of the flexible substrate 6 on the detection unit 7 side is divided into a plurality of connection pieces 61 by forming a cut or cut portion. Each connection piece 61 is connected to the detection unit 7 via an individual connector 71. That is, by connecting the plurality of connection pieces 61 to the detection unit 7, it becomes possible to collectively connect the plurality of magnetoelectric transducers 4 to the detection unit 7 using one flexible substrate 6. ing.

  The holding case 8 is a housing that holds the magnetic field generation unit 3, the magnetoelectric conversion element 4, the holding substrate 5, and the flexible substrate 6. The magnetic field generating unit 3, the magnetoelectric conversion element 4, and the holding substrate 5 are fixed by a holding case 8 so that their positional relationship does not move in a substantially sealed state. The flexible substrate 6 is bonded and fixed to a holding case 6 fixed to the magnetic field generator 3, the magnetoelectric conversion element 4 and the holding substrate 5. This adhesion fixing is performed using a material containing an epoxy resin such as an epoxy adhesive.

  The magnetic field generator 3 and the holding substrate 5 are connected by the holding case 8. In this example, connecting members 81 are provided at both ends in the width direction D2 of the magnetic field generating unit 3, and the holding case 8 and the holding substrate 5 are connected to both ends in the width direction D2 by the connecting members 81. Specifically, the connecting member 81 is a protrusion that protrudes from the holding case 8 toward the holding substrate 5, and positioning holes 52 are formed at both ends of the holding substrate 5 at positions facing each protrusion.

  Accordingly, the holding substrate 5 can be easily positioned with respect to the magnetic field generating unit 3 simply by inserting the connecting member 81 into the positioning hole 52 formed in the holding substrate 5. In particular, when the plurality of magnetoelectric conversion elements 4 are held by the holding substrate 5 as in the present embodiment, the positioning of each magnetoelectric conversion element 4 is easily and accurately performed by simply positioning the holding substrate 5. Therefore, the assembling work can be simplified.

  The number of connecting members 81 is not limited to two, and three or more connecting members 81 may be provided. Further, the connecting member 81 is not limited to the configuration in which the connecting member 81 is connected to the connecting member 81 at both end portions in the width direction D2 at one end portion of the holding substrate 6, and the holding substrate 5 is placed at other positions such as the center portion in the width direction D2. The structure which connects with the connection member 81 may be sufficient. Furthermore, the connection member 81 is not limited to the configuration provided in the holding case 8, and may be provided in the magnetic field generation unit 3 or may be provided in another member, for example. In this case, it is not necessary to fix the holding case 8 to the magnetic field generator 3 or the magnetoelectric conversion element 4.

  The protective cover 9 is a cover that protects the magnetoelectric conversion element 4 from the paper sheet S and the like conveyed in the conveyance path 2, and is made of a non-magnetic material (for example, phosphor bronze). The spacer 10 and the attachment 11 are made of a non-magnetic material for preventing the protective cover from being deformed by the paper sheet S conveyed in the conveyance path 2. The spacer 10 is configured to be higher than the magnetoelectric transducer 4 so that the magnetoelectric transducer 4 does not come into contact with the protective cover 9 by the paper sheet S conveyed in the conveyance path 2, and is subjected to vibration due to the conveyance of the paper sheet S. The spacer 10 and the holding substrate 5 are fixed by an elastic double-sided tape so as not to be present. Here, the elastic double-sided tape is only an example of an elastic member, and other elastic members can be used. Further, the flexible substrate 6 is sandwiched and fixed by the holding case 8 and the attachment 11.

  FIG. 4A is a schematic plan view showing the holding substrate 5 partially enlarged. FIG. 4B is a schematic bottom view of the holding substrate 5 of FIG. 4A. As shown in FIGS. 4A and 4B, circuit patterns 53 and 54 are formed on the holding substrate 5 on both the front surface and the back surface. On the surface of the holding substrate 5, circuit patterns 53 and 54 are formed at attachment positions of the respective magnetoelectric conversion elements 4, and the magnetoelectric conversion elements 4 are mounted on the circuit patterns 53 and 54. The circuit pattern 53 is a signal pattern from the magnetoelectric conversion element 4, extends from the output of each magnetoelectric conversion element 4 to the connector 51 mounted on the holding substrate 5, and the flexible substrate 6 is attached to the connector 51.

  The circuit pattern 54 is a power supply pattern that applies a constant voltage to the magnetoelectric conversion element 4. The circuit pattern 54 is drawn by the circuit pattern 54 on the back surface from the connector 51 mounted on the holding substrate 5, and the through-hole hole 55 of the holding substrate 5 is formed. Via the circuit pattern 54 on the surface. The power supplies of all the magnetoelectric transducers 4 are connected in parallel.

  In this example, the front surface is connected by a signal pattern and the back surface is connected by a power supply pattern. However, the configuration is not limited to this, and the circuit pattern 54 may be divided. Further, in the present embodiment, the magnetoelectric conversion elements 4 are connected in parallel at a constant voltage, but the power supply pattern of each magnetoelectric conversion element 4 may be connected in series by using a power supply that supplies a constant current.

  According to this embodiment, the case where the magnetic field generation part 3 was comprised with the permanent magnet and the magnetoelectric conversion element 4 with the Hall element was demonstrated. However, the configuration is not limited to this, and the magnetic field generation unit 3 may be configured with a coil, and the magnetoelectric conversion element 4 may be configured with a magnetoresistive element, a magnetic impedance element, or the like.

Second Embodiment
FIG. 5 is a schematic cross-sectional view showing a configuration example of the magnetic sensor device 100 according to the second embodiment of the present invention. FIG. 6 is a schematic perspective view showing a part of the magnetic sensor device 100. In the first embodiment, the configuration in which the plurality of magnetoelectric conversion elements 4 are held by the holding substrate 5 has been described, but in the second embodiment, the plurality of magnetoelectric conversion elements 4 are mounted on the flexible substrate 6. Different from one embodiment. That is, in the second embodiment, the holding substrate 5 in the first embodiment is configured by the flexible substrate 6, and the holding substrate 5 and the connection portion 60 are integrated. Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and detailed description thereof is omitted.

  A plurality of magnetoelectric transducers 4 arranged on a straight line along the width direction D <b> 2 are held by a flexible substrate 6. In general, the flexible substrate 6 is made of a material covered with polyimide, but may be formed around each magnetoelectric conversion element 4 with a solder resist having a small thermal expansion instead of polyimide. By forming the periphery of the magnetoelectric conversion element 4 with a solder resist, positional deviation around the magnetoelectric conversion element 4 due to temperature change is less likely to occur.

  Further, the end of the flexible substrate 6 on the detection unit 7 side is divided into a plurality of connection pieces 61 by forming a cut or cut portion. Each connection piece 61 is connected to the detection unit 7 via an individual connector 71. This is unlikely to cause deformation due to thermal expansion as compared with the case where the end of the flexible substrate 6 on the detection unit 7 side is not divided. Thereby, since the influence which the deformation | transformation of the said edge part has on the edge part of the other side (magnetoelectric conversion element 4 side) can be suppressed, the position shift of each magnetoelectric conversion element 4 by the deformation | transformation of the flexible substrate 6 does not arise easily. In this example, the end portion of the flexible substrate 6 is divided into three connection pieces 61, but not limited to this, it may be divided into two connection pieces 61, or four or more connection pieces 61. It may be divided.

  Further, the detection unit 7 is connected via the flexible substrate 6. That is, one end portion of the flexible substrate 6 is detachably connected, and the other end portion of the flexible substrate 6 is detachably connected to the connector 71 mounted on the drive substrate constituting the detection unit 7. The circuit on the substrate 6 and the detection unit 7 are electrically connected. Thereby, a large number of magnetoelectric conversion elements 4 can be mounted on the flexible substrate 6, and these magnetoelectric conversion elements 4 can be collectively connected to the detection unit 7 by the flexible substrate 6.

  In this case, the plurality of magnetoelectric conversion elements 4 are directly held by the flexible substrate 6, so that the holding substrate 5 as in the first embodiment becomes unnecessary. Therefore, the structure is simplified, and a plurality of magnetoelectric transducers 4 can be installed in a narrower space.

  The magnetic field generator 3 and the flexible substrate 6 are connected by a connecting member 81 provided in the holding case 8. In this example, connecting members 81 are attached to both ends of the permanent magnet 3 in the width direction D2, and the connecting members 81 are connected to both ends of the flexible substrate 6 in the width direction D2. Specifically, the connecting member 81 is a positioning protrusion that protrudes from the holding case 8 toward the flexible substrate 6. The connecting member 81 is positioned at both ends in the width direction D <b> 2 at one end of the flexible substrate 6 at a position facing each positioning protrusion. A hole 63 is formed.

  Thereby, the flexible substrate 6 can be easily positioned with respect to the magnetic field generating unit 3 simply by inserting the connecting member 81 into the positioning hole 63 formed in the flexible substrate 6. In particular, when the plurality of magnetoelectric conversion elements 4 are mounted on the flexible substrate 6 as in the present embodiment, the positioning of each magnetoelectric conversion element 4 is easily and accurately performed by simply positioning the flexible substrate 6. Therefore, the assembling work can be simplified.

  Note that the number of connecting members 81 is not limited to two, but may be one, or may be three or more. In addition, the connecting member 81 is not limited to the configuration in which the connecting member 81 is connected to the connecting member 81 at both ends in the width direction D2 at one end of the flexible substrate 6, but the flexible substrate 6 is placed at other positions such as the central portion in the width direction D2. The structure which connects with the connection member 81 may be sufficient. Furthermore, the connection member 81 is not limited to the configuration provided in the holding case 8, and may be provided in the magnetic field generation unit 3 or may be provided in another member, for example. In this case, it is not necessary to fix the holding case 8 to the magnetic field generator 3 or the magnetoelectric conversion element 4.

  In the above embodiment, the case where the magnetic field generation unit 3 is configured by a permanent magnet and the magnetoelectric conversion element 4 is configured by a Hall element has been described. However, the present invention is not limited to such a configuration. For example, the magnetic field generating unit 3 is configured by an electromagnetic coil, the magnetoelectric conversion element 4 is configured by a magnetoresistive element, a magnetic impedance element, or the like, and the magnetic field strength along the magnetic field direction D3 in the transport path 2 is It may be configured to be converted into an electric signal.

  According to the above invention, a plurality of small magnetoelectric transducers 4 can be arranged with a fine pitch with high precision, and can be connected even if the input / output terminals of the magnetoelectric transducer 4 and the detector 7 are increased. The magnetic sensor device 1 that can manufacture the distance between the magnetic field generator 3, the transport path 2, and the magnetoelectric transducer 4 in a compact manner can be realized. Thereby, the magnetic substance contained in the paper sheet S can be detected with high resolution and high accuracy.

DESCRIPTION OF SYMBOLS 1 Magnetic sensor apparatus 2 Conveyance path 21 Upstream conveyance roller 22 Downstream conveyance roller 23 Sensor opposing roller 3 Magnetic field generating part 4 Magnetoelectric conversion element 5 Holding substrate 6 Flexible substrate 7 Detection part 8 Holding case 9 Protective cover 10 Spacer 11 Attachment 40 Sensor part 51 Connector 52 Positioning hole 53 Signal pattern 54 Power supply pattern 60 Connection portion 61 Connection piece 63 Positioning hole 64 Solder resist 71 Connector 81 Connecting member 100 Magnetic sensor device

Claims (8)

A magnetic sensor device for detecting a magnetic material contained in a paper sheet conveyed through a conveyance path,
A magnetic field generator for generating a magnetic field in the transport path;
A sensor unit provided with a plurality of magnetoelectric conversion elements for converting the intensity of the magnetic field generated by the magnetic field generation unit into an electric signal in a direction orthogonal to the conveyance direction of the paper sheet;
While holding the sensor unit, a holding substrate having a circuit pattern for input / output signals from the plurality of magnetoelectric conversion elements,
A detection unit for detecting a magnetic substance contained in the paper sheet based on a signal input from the holding substrate;
A holding case for holding the holding substrate and the magnetic field generating unit, and fixing the holding substrate and the magnetic field generating unit;
A connection part for connecting the sensor part and the detection part with a flexible flexible substrate coated with a polyimide material;
A protective cover for protecting the sensor unit from paper sheets conveyed to a conveyance path;
A spacer for fixing the holding substrate and the protective cover around the sensor unit;
The spacer has a thickness larger than the height of the sensor unit, and the spacer and the holding substrate are fixed via an elastic member,
The flexible substrate is provided outside the holding case,
An attachment that is provided between the flexible substrate and the protective cover and sandwiches the flexible substrate with the holding case ;
An output signal from the magnetoelectric conversion element is input to the detection unit through the flexible substrate.   The magnetic sensor device according to claim 1, wherein the connection portion is bonded and fixed to the holding case.   The magnetic sensor device according to claim 2, wherein the connection portion is bonded and fixed to the holding case with an epoxy resin.   The holding case includes a plurality of positioning protrusions for positioning the holding substrate with respect to the magnetic field generating portion, and the holding substrate has a positioning hole into which the positioning protrusion is inserted. The magnetic sensor device according to claim 1.   The magnetic sensor device according to claim 1, wherein the holding substrate is formed of a flexible substrate, and the holding substrate and the connection portion are integrated.   6. The magnetic sensor device according to claim 5, wherein the flexible substrate is formed of a solder resist material around the magnetoelectric conversion element.   The magnetic sensor device according to claim 1, wherein the flexible substrate and the detection unit are connected by a connector.   The end portion on the detection unit side of the flexible substrate is divided into a plurality of connection pieces, and the plurality of connection pieces are respectively connected to the detection unit. The magnetic sensor device described.

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