WO2015194605A1 - 磁気センサ装置及びその製造方法 - Google Patents
磁気センサ装置及びその製造方法 Download PDFInfo
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- WO2015194605A1 WO2015194605A1 PCT/JP2015/067520 JP2015067520W WO2015194605A1 WO 2015194605 A1 WO2015194605 A1 WO 2015194605A1 JP 2015067520 W JP2015067520 W JP 2015067520W WO 2015194605 A1 WO2015194605 A1 WO 2015194605A1
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- sensor device
- magnetic sensor
- magnetic
- magnet
- conveyance path
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
- G01R33/091—Constructional adaptation of the sensor to specific applications
Definitions
- the present invention relates to a magnetic sensor device and a manufacturing method thereof.
- Patent Document 1 discloses a magnetic sensor device that includes a magnet and a magnetoresistive effect element and detects an object to be detected that is transported along a transport path.
- the magnet has a magnetic pole disposed on one surface side on which the object to be detected is conveyed, and generates a crossing magnetic field that intersects the object to be detected.
- the magnetoresistive element is provided between the magnet and the object to be detected.
- the magnetoresistive effect element has an output terminal, and outputs a change in the direction of conveyance of the crossing magnetic field due to the magnetic component of the detected object conveyed in the crossing magnetic field as a change in resistance value.
- Patent Document 2 describes a magnetic sensor including a magnetoresistive element, a conductor layer, and a resistor.
- the magnetoresistive element has an element substrate and a pair of magnetosensitive parts arranged on the element substrate in parallel with a certain interval.
- the conductor layer is disposed at a position that is equidistant from each of the pair of magnetic sensing parts.
- the resistor is electrically connected in series to the conductor layer.
- the most heat generating member is a magnetoresistive element.
- the resolution is low and the number of magnetoresistive elements is small. For this reason, there was little calorific value and it was not necessary to make the structure which considered heat dissipation.
- the magnetic sensor device has a high resolution, a large number of magnetoresistive elements are arranged, so that the amount of heat generation increases and the magnetic sensor device is likely to become high temperature.
- the temperature of the magnetic sensor device becomes high, the magnet used for the magnetic sensor device is demagnetized, so that the capability of the magnetic sensor device may be reduced.
- the present invention has been made to solve the above-described problems, and provides a magnetic sensor device that is excellent in heat dissipation and can suppress a decrease in capability due to heat generation of a magnetoresistive effect element, and a manufacturing method thereof. With the goal.
- a magnetic sensor device includes a magnetic circuit that forms a magnetic field, a magnetoresistive effect element, and a heat dissipation member.
- the magnetoresistive effect element outputs a change in magnetic field as a change in resistance value, and is placed on the surface of the magnetic circuit on the side of the conveyance path of the detection target.
- the heat radiating member is disposed in close contact with the surface excluding the surface on the conveyance path side of the magnetic circuit.
- the heat radiating member is disposed in close contact with the surface excluding the surface on the conveyance path side of the magnetic circuit.
- FIG. 3 is a perspective view of the magnetic sensor device according to the first embodiment (a perspective view with the cover side facing up).
- 1 is a perspective view of a magnetic sensor device according to Embodiment 1 (a perspective view with a signal processing board side facing up).
- FIG. 2 is a cross-sectional view of a case according to Embodiment 1.
- FIG. 2 is a perspective view of a metal carrier in the magnetic sensor device according to Embodiment 1.
- FIG. 4 is a cross-sectional view of a metal carrier in the magnetic sensor device according to Embodiment 1.
- FIG. 3 is a perspective view of the magnetic sensor device according to the first embodiment (a perspective view with the cover side facing up).
- 1 is a perspective view of a magnetic sensor device according to Embodiment 1 (a perspective view with a signal processing board side facing up).
- FIG. 2 is a cross-sectional view of a case according to Embodiment 1.
- FIG. 2 is a perspective view of a metal carrier in the magnetic sensor
- FIG. 1 is a perspective view of the state which assembled the sensor board
- 2 is a plan view of a sensor substrate in the magnetic sensor device according to Embodiment 1.
- FIG. 3 is a perspective view of a state in which a permanent magnet and a yoke are bonded in the magnetic sensor device according to the first embodiment.
- FIG. 5 is a cross-sectional view of a state where the integrated permanent magnet and the carrier are bonded to the state of FIG.
- FIG. 4 is a cross-sectional view of the magnetic sensor device according to the first embodiment. It is sectional drawing of the state which attached the thing of the state of FIG. 6 to the case in the magnetic sensor apparatus which concerns on Embodiment 1.
- FIG. It is sectional drawing of the state which attached the heat radiating member in the state of FIG. 7 in the magnetic sensor apparatus which concerns on Embodiment 1.
- FIG. FIG. 9 is a cross-sectional view of the magnetic sensor device according to the first embodiment with a cover attached to the state of FIG. 8.
- FIG. 3 is a cross-sectional view of a case in the magnetic sensor device according to the first embodiment. It is sectional drawing of the magnetic sensor apparatus which concerns on a comparative example. It is sectional drawing of the magnetic sensor apparatus which concerns on Embodiment 2 of this invention.
- FIG. 6 is a cross-sectional view of a case in a magnetic sensor device according to a third embodiment.
- FIG. 6 is a cross-sectional view of a magnetic sensor device according to a third embodiment. It is a perspective view of the case in the magnetic sensor apparatus which concerns on Embodiment 4 of this invention. It is sectional drawing of the magnetic sensor apparatus which concerns on Embodiment 4.
- FIG. It is a perspective view of the heat radiating member in the magnetic sensor apparatus which concerns on Embodiment 5 of this invention.
- FIG. 9 is a cross-sectional view of a magnetic sensor device according to a fifth embodiment.
- FIG. 10 is a cross-sectional view of a magnetic sensor device according to a sixth embodiment. It is sectional drawing of the magnetic sensor apparatus which concerns on Embodiment 7 of this invention.
- Embodiment 1 A magnetic sensor device and a manufacturing method thereof according to Embodiment 1 of the present invention will be described.
- the detection object is conveyed in addition to the case where the detection object itself is conveyed, and the magnetic sensor device itself moves in the conveyance direction (the Y direction in FIG. 1) without moving the detection object. ) Is also included.
- the X direction is referred to as the reading width direction.
- the three axes indicated as X, Y, and Z in the figure are orthogonal three axes.
- the X axis indicates the reading width direction of the magnetic sensor device (longitudinal direction of the magnetic sensor device).
- the Y-axis indicates the transport direction of the magnetic sensor device (the transport direction of the detection object to be transported, the short direction of the magnetic sensor device).
- the Z axis indicates the height direction of the magnetic sensor device. Further, a portion where the detection target object is transported in the transport direction is referred to as a detection target transport path.
- the origin of the X axis is the center of the length of the magnetic sensor device in the X axis direction, and the direction of the arrow in the figure is the + direction (positive direction).
- the origin of the Y axis is the center of the length of the magnetic sensor device in the Y axis direction, and the direction of the arrow in the figure is the + direction (positive direction).
- the origin of the Z-axis is the center of the length of the magnetic sensor device in the Z-axis direction, and the direction of the arrow in the figure is the + direction (positive direction).
- the same reference numerals indicate the same or corresponding parts.
- FIG. 1 is a cross-sectional view in the ZY plane of the magnetic sensor device according to the first embodiment of the present invention.
- a magnetic sensor device 100 shown in FIG. 1 is used, for example, for a printed matter (banknote or the like) identification device or magnetic card reader using magnetic ink.
- the magnetic sensor device 100 includes a magnetic circuit 30 and a heat radiating member 11 along the Z direction orthogonal to the conveyance direction 21 (Y direction) of the detection object 20 such as a banknote.
- the magnetic circuit 30 includes a magnet 9, a metal carrier 7 on which the magnetoresistive element 4 is mounted, a magnetic carrier 7 a and a nonmagnetic carrier 7 b, and a yoke 10.
- the magnet 9 and the magnetic carrier 7a constituting the magnetic circuit 30 are configured such that the magnetic flux emitted from one pole of the magnet 9 flows out through the magnetic carrier 7a to the space on the conveyance path side, and passes through the yoke 10 once. Thus, a magnetic field is formed by returning to the other pole of the magnet 9.
- the detection target 20 is transported along the transport path so as to pass through a gap (space) in which the magnetic field is formed.
- the magnetic sensor device 100 includes a cover 1, a case 2, a sensor substrate 3, a signal amplification IC (Integrated Circuit) 5, a wire 6, a fastening member 8, and a signal processing substrate 13.
- the transport direction 21 is the + Y direction, but it may be the ⁇ Y direction.
- FIGS. 2A and 2B are perspective views of the magnetic sensor device according to Embodiment 1 of the present invention.
- FIG. 2A is a perspective view with the cover 1 facing upward.
- FIG. 2B is a perspective view with the signal processing board 13 facing upward.
- the cover 1 is a member that constitutes an inspection object conveyance surface of the magnetic sensor device 100.
- the cover 1 extends in the X direction.
- the cover 1 is disposed on the conveyance path side of the case 2.
- the cover 1 has a taper 1a and a conveyance surface 1b extending along the conveyance path.
- the taper 1a is continuous with the conveyance surface 1b at the upper end and the lower end of the conveyance surface 1b in the conveyance direction 21, and is inclined in the direction opposite to the conveyance path side.
- the cover 1 is formed in a shape that covers the magnetoresistive effect element 4.
- Case 2 is made of a frame as shown in FIG.
- the case 2 is formed with holes 2b and 2c for storing and holding each member constituting the magnetic sensor device 100, a hole for positioning, and a board mounting surface 2f.
- the sensor substrate 3 is disposed between the cover 1 and the metal carrier 7.
- the sensor substrate 3 has a structure in which a non-conductive portion 3a and a conductive portion 3b on which a wiring pattern is formed are stacked in the Z direction.
- the non-conductive portion 3a is fixed to the cover 1 with a double-sided tape, an adhesive, or the like.
- the conducting part 3b is fixed to the metal carrier 7 with a double-sided tape, an adhesive or the like.
- the magnetoresistive effect element 4 is arranged on the conveyance path side (+ Z side) of the magnet 9.
- the magnetoresistive element 4 is fixed to the surface of the magnetic carrier 7a on the + Z side (conveying path side) with an adhesive or the like.
- the magnetoresistive effect element 4 is electrically connected to the conduction part 3 b of the sensor substrate 3 through the wire 6.
- the signal amplification IC (Integrated Circuit) 5 is fixed to the + Z side (conveyance path side) surface of the nonmagnetic carrier 7b with an adhesive or the like.
- the signal amplification IC 5 is electrically connected to the conduction part 3 b of the sensor substrate 3 through the wire 6. Thereby, the signal amplification IC 5 is electrically connected to the magnetoresistive effect element 4.
- FIG. 3A is a perspective view of the metal carrier
- FIG. 3B is a cross-sectional view of the metal carrier.
- the metal carrier 7 is in close contact with the surface of the magnet 9 on the conveyance path side (the surface on the + Z side of the magnet 9) and places the magnetoresistive element 4.
- the metal carrier 7 is integrally formed by joining the magnetic carrier 7a and the nonmagnetic carrier 7b in the Y direction (conveying direction 21).
- the metal carrier 7 is fitted from an opening (opening on the conveyance path side) of the hole 2b of the case 2 and fixed by an adhesive or the like.
- the magnet 9 is composed of a permanent magnet as shown in FIG.
- the magnet 9 is fixed to the surface opposite to the surface in contact with the sensor substrate 3 of the metal carrier 7 (surface on the ⁇ Z side of the metal carrier 7) with an adhesive or the like.
- the yoke 10 is in close contact with the surface of the magnet 9 opposite to the contact surface with the metal carrier 7 (the surface on the ⁇ Z side of the magnet 9).
- the yoke 10 is fixed to the surface of the magnet 9 opposite to the surface in contact with the metal carrier 7 (the surface on the ⁇ Z side of the magnet 9) with an adhesive or the like.
- the yoke 10 is a magnetic metal plate.
- the heat dissipating member 11 is in close contact with the surface of the yoke 10 opposite to the contact surface with the magnet 9 (the surface on the ⁇ Z side of the yoke 10).
- the heat radiating member 11 is a member for releasing the heat inside the magnetic sensor device 100 to the outside air.
- the heat dissipating member 11 is fitted from the opening of the hole 2e of the case 2 (opening on the side opposite to the conveyance path side), and the surface opposite to the surface of the yoke 10 in contact with the magnet 9 (-Z of the yoke 10). It is attached to the side surface with an adhesive or the like.
- the heat dissipating member 11 has fins 11b that protrude on the side opposite to the conveyance path side.
- the fins 11 b are arranged in a plurality of rows in the Y direction and are formed integrally with the main body of the heat dissipation member 11. That is, the heat radiating member 11 is in close contact with the surface of the magnetic circuit 30 on the side opposite to the conveyance path side, which is a surface excluding the surface on the conveyance path side.
- the signal processing board 13 is electrically connected to the sensor board 3 via the cable 3c.
- the signal processing board 13 is attached to the side of the case 2 opposite to the side in contact with the cover 1 (the ⁇ Z side of the case 2). Thereby, the signal processing board 13 covers the heat radiating member 11.
- the cover 1 is a member constituting a detection target transport surface of the magnetic sensor device 100.
- the cover 1 is manufactured by bending a metal thin plate.
- the cover 1 has a taper 1a that inclines in the opposite direction ( ⁇ Z direction) from the conveyance path side of the detection target 20 to the conveyance path side.
- the taper 1a functions as a conveyance guide. Due to the taper 1a, the detection target 20 flows along the taper 1a during conveyance. Thereby, it can prevent that the detection target 20 flows into directions other than a conveyance direction (Y direction).
- the cover 1 has a role of protecting the magnetic sensor device 100 from impact and wear due to collision or rubbing when the detection target 20 is transported on the magnetic sensor device 100. Further, since the signal amplification IC 5 generates noise in response to light, the cover 1 has a role of shielding external light from reaching the signal amplification IC 5.
- the cover 1 is disposed between the detection target 20 and the magnetoresistive element 4. For this reason, it is desirable that the material of the cover 1 is a non-magnetic material so as not to affect the magnetic sensitivity of the magnetic sensor device 100.
- the cover 1 is manufactured by bending a metal thin plate.
- the cover 1 may be other than one produced by bending a metal thin plate.
- FIG. 2C is a cross-sectional view of the case of the magnetic sensor device.
- the case 2 is a member for housing other members therein.
- Case 2 is formed of a black resin.
- the case 2 is formed with a step 2a, holes 2b, 2c, 2e, a board mounting surface 2f, and a board mounting hole 2g.
- the stage 2a is used to support the metal carrier 7 integrated with the sensor substrate 3, the magnetoresistive effect element 4, the signal amplification IC 5 and the wire 6 in the Z direction.
- the step 2 a is provided on the conveyance path side of the case 2.
- the hole 2b has an opening formed in the surface on the + Z side, and positions the metal carrier 7 integrated with the sensor substrate 3, the magnetoresistive effect element 4, the signal amplification IC 5, and the wire 6 in the XY direction. Used for.
- the hole 2b is provided on the conveyance path side (+ Z side) of the case 2 with the step 2a as a bottom.
- the hole 2c is used for positioning the integrated magnet 9 and yoke 10 in the XY directions.
- the hole 2c is a through hole penetrating from the hole 2b to the hole 2e.
- the hole 2 e has an opening formed on the ⁇ Z side surface, and is used to position the heat radiating member 11 in the X and Y directions when the heat radiating member 11 is attached to the yoke 10.
- the hole 2e is provided on the surface of the case 2 opposite to the conveyance path side ( ⁇ Z side).
- the board mounting surface 2f is provided on the surface ( ⁇ Z side) opposite to the conveyance path side of the detection target 20.
- the board attachment surface 2f is used for attaching the signal processing board 13.
- the board mounting hole 2g is used for positioning the signal processing board 13 and fixing it to the case 2.
- the case 2 Since the signal amplification IC 5 generates noise in response to light, the case 2 has a role of shielding external light from reaching the signal amplification IC 5.
- Case 2 is molded from black resin in the first embodiment of the present invention. However, it is not limited to the above materials.
- the case 2 may be formed of a material other than the black resin as long as it has the above role.
- the sensor substrate 3 has a non-conductive portion 3a and a conductive portion 3b.
- the non-conducting portion 3 a is used for providing a space so that the cover 1 does not contact the magnetoresistive effect element 4, the signal amplification IC 5, and the wire 6.
- wirings for transmitting electrical signals of the magnetoresistive effect element 4 and the signal amplification IC 5 are disposed.
- the cable 3 c is used to transmit an electric signal from the sensor board 3 to the signal processing board 13.
- the sensor substrate 3 is attached to the surface of the metal carrier 7 on the + Z side (the conveyance path side of the detection target 20).
- the position of the sensor substrate 3 is determined by contacting the metal carrier 7.
- the sensor substrate 3 has a positioning hole 3d.
- the positioning holes 3d are formed in the vicinity of both end portions of the sensor substrate 3 in the X direction.
- the metal carrier 7 has a positioning hole 7c.
- the positioning holes 7c are formed in the vicinity of both ends of the metal carrier 7 in the X direction.
- pins are inserted into the positioning holes 3d and 7c. Accordingly, the sensor substrate 3 is positioned with respect to the metal carrier 7 by overlapping the positioning holes 3 d and 7 c on the same axis.
- the positioning hole 3d and the positioning hole 7c are formed at least two places.
- the magnetoresistive effect element 4 is fixed to the same surface as the surface on which the sensor substrate 3 of the magnetic carrier 7a is attached with an adhesive or the like.
- the magnetoresistive element 4 is in contact with the magnetic carrier 7a, so that the position in the Z direction is defined.
- the magnetoresistive effect element 4 is disposed inside the opening 3 e for the magnetoresistive effect element 4 of the sensor substrate 3.
- the magnetoresistive effect element 4 is arranged on a virtual line L2 parallel to the straight line L1 that connects the positioning holes 3d at both ends of the sensor substrate 3.
- the fixed position of the magnetoresistive element 4 in the Y direction is not limited to this.
- the virtual line L2 may be offset in parallel to the X direction and the Y direction, respectively.
- the magnetoresistive effect element 4 detects a change in the conveyance direction component of the magnetic field generated when the detection object 20 including a magnetic component such as a bill is conveyed in the direction of the conveyance direction 21. Specifically, the resistance value of the magnetoresistive effect element 4 changes corresponding to the change of the magnetic field. Based on the change in the resistance value, the magnetoresistive element 4 detects the change in the magnetic field. The magnetoresistive element 4 outputs a signal corresponding to the amount of change in the magnetic field.
- the signal amplification IC 5 is fixed to the same surface as the surface on which the sensor substrate 3 of the nonmagnetic carrier 7b is attached with an adhesive or the like.
- the signal amplifying IC 5 is in contact with the nonmagnetic carrier 7b, so that the position in the Z direction is defined.
- the signal amplification IC 5 is disposed in the vicinity of the center of the opening 3f for the signal amplification IC 5 in the XY plane, whereby the position of the signal amplification IC 5 in the XY plane is defined.
- the signal amplification IC 5 amplifies the signal output from the magnetoresistive effect element 4.
- the wire 6 electrically connects the magnetoresistive effect element 4 and the signal amplification IC 5 to the conduction part 3 b of the sensor substrate 3.
- the metal carrier 7 has a magnetic carrier 7a and a nonmagnetic carrier 7b.
- the metal carrier 7 supports the sensor substrate 3 in the Z direction.
- the magnetic carrier 7a has a role of adjusting the direction of the magnetic field of the magnet 9 in the Z direction.
- One surface of the magnet 9 in the Z direction (the surface opposite to the conveyance path side of the detection target 20, the surface on the ⁇ Z side) is bonded to the yoke 10.
- the magnet 9 and the yoke 10 have the same size in the X and Y directions.
- the integrated magnet 9 and yoke 10 are arranged in parallel to the magnetoresistive element 4.
- the surface of the magnet 9 facing the surface where the magnet 9 and the yoke 10 are bonded (the surface of the magnet 9 on the conveyance path side) and the surface of the metal carrier 7 facing the surface where the sensor substrate 3 of the metal carrier 7 is bonded.
- the surface (the surface of the metal carrier 7 on the side opposite to the conveyance path side) is fixed by adhesion.
- the position of the magnet 9 in the Z direction is defined by fixing the surface of the magnet 9 and the surface of the metal carrier 7. Further, the position of the magnet 9 in the XY plane with respect to the magnetoresistive effect element 4 is also defined.
- the position of the magnet 9 in the Y direction changes, the magnetic force applied to the magnetoresistive effect element 4 and the detection target 20 changes, so that the position of the magnet 9 in the Y direction is finely adjusted according to the performance of the magnetic sensor device 100. Good.
- the magnet 9 has a role of generating a magnetic field and applying a magnetic force to the detection target 20.
- the yoke 10 has a role of strengthening the magnetic field generated by the magnet 9.
- the heat radiating member 11 is fixed to an opposing surface of the yoke 10 in contact with the magnet 9 by an adhesive or the like. Thereby, the position in the Z direction of the heat radiating member 11 is prescribed
- the heat radiating member 11 radiates mainly heat generated by the magnetoresistive effect element 4 and the signal amplification IC 5 to the outside of the magnetic sensor device 100.
- the heat radiating member 11 has a role of suppressing the high temperature of the magnetic sensor device 100 itself.
- the signal processing board 13 is electrically connected to the sensor board 3 via the cable 3c.
- the position of the signal processing board 13 in the Z direction is defined by bringing one of the Z direction faces of the signal processing board 13 (the face on the conveyance path side of the detection target 20) into contact with the board mounting surface 2f of the case 2. ing.
- the signal processing board 13 is fixed to the case 2 in the XY directions by fixing the signal processing board 13 with the fastening member 8 in a state where the board mounting hole 2g of the case 2 and the axis of the board mounting hole 13a of the signal processing board 13 are overlapped.
- the position of is defined.
- the fastening member 8 is, for example, a screw.
- the present invention is not limited to this, and the fastening member 8 may be other than a screw as long as it can fix the signal processing board 13 to the case 2 such as caulking.
- the manufacturing method of the magnetic sensor device 100 includes a carrier assembly process, a sensor substrate assembly process, a permanent magnet assembly process, and a final assembly process. Of these processes, the carrier assembly process is performed before the sensor substrate assembly process, and the final assembly process is performed after the other processes.
- the carrier assembly process will be described with reference to FIGS. 3A and 3B.
- the carrier assembling step is a step of assembling the metal carrier 7 by fixing the magnetic carrier 7a to the opening 7d of the nonmagnetic carrier 7b.
- the magnetic carrier 7a is fixed by, for example, adhesion with a resin adhesive or caulking. At this time, if there is a difference in thickness between the magnetic carrier 7a and the non-magnetic carrier 7b, the other surface is arranged flush with respect to one surface in the Z direction so as not to cause a step.
- the sensor substrate assembly process will be described with reference to FIGS. 4A and 4B.
- the sensor board assembly process is a process of bonding the sensor board 3 or the like to one surface of the metal carrier 7.
- the magnetoresistive effect element 4 is arranged on the magnetic carrier 7a of the metal carrier 7 and the signal amplification IC 5 is arranged on the nonmagnetic carrier 7b in parallel to the X-axis direction. Then, the magnetoresistive effect element 4 and the signal amplification IC 5 are electrically connected to the conduction portion 3 b of the sensor substrate 3 through the wire 6.
- the attachment surface of the metal carrier 7 (the surface on the + Z side of the metal carrier 7) is the magnetic carrier 7a and the nonmagnetic carrier 7b. Make sure that there are no steps.
- the magnetoresistive effect element 4 When attaching the magnetoresistive effect element 4 to the magnetic carrier 7a, the magnetoresistive effect element 4 is attached so that the magnetoresistive effect element 4 does not protrude in the + Z direction from the opening 3e of the sensor substrate 3.
- the signal amplification IC 5 is attached to the nonmagnetic carrier 7b, the signal amplification IC 5 is attached so that the signal amplification IC 5 does not protrude in the + Z direction from the opening 3f of the sensor substrate 3.
- the magnet assembly process is a process of integrating the magnet 9 and the yoke 10.
- the number of magnets 9 is not necessarily one, and a plurality of magnets 9 divided in the X direction (longitudinal direction) may be integrated.
- the magnet 9 is attached to the surface of the yoke 10 on the + Z side, and the position of the magnet 9 relative to the yoke 10 is defined by aligning the side surfaces of the magnet 9 and the yoke 10 in the X direction and the Y direction. At this time, the directions of the S pole and the N pole of all the magnets 9 are aligned in the same direction.
- the magnet 9 is fixed to the yoke 10 with an adhesive or the like.
- the final assembly process will be described with reference to FIGS.
- the final assembly process includes the following processes.
- a magnet 9 is fixed to the metal carrier 7.
- the metal carrier 7 to which the magnet 9 is fixed is fixed to the case 2 as shown in FIG.
- the heat dissipating member 11 is fixed to the yoke 10 as shown in FIG.
- the cover 1 is fixed to the sensor substrate 3 as shown in FIG.
- FIG. 10 shows a magnetic sensor device in which the sensor substrate 3 is electrically connected to the signal processing substrate 13 and the signal processing substrate 13 is fixed to the case 2.
- the surface of the metal carrier 7 opposite to the surface on which the yoke 10 of the magnet 9 is fixed to the surface opposite to the surface to which the sensor substrate 3 is bonded (the surface on the ⁇ Z side). (+ Z side surface) is brought into contact.
- the magnet 9 is aligned with the magnetic carrier 7a and the centers of the magnet 9 and the magnetic carrier 7a in the X direction are aligned. Since the performance of the magnetic sensor device varies depending on the position of the magnet 9, a jig for adjusting the fixing position of the magnet 9 may be used separately.
- the surface opposite to the surface where the sensor substrate 3 of the metal carrier 7 is bonded (the surface on the ⁇ Z side) is brought into contact with the step 2 a of the case 2.
- the metal carrier 7 is fitted from the opening of the hole 2b.
- the magnet 9 is disposed inside the hole 2 c of the case 2.
- the heat radiating member 11 is bonded to the surface (the surface on the ⁇ Z side) opposite to the surface bonded to the magnet 9 of the yoke 10. At this time, the heat radiating member 11 is fitted into the hole 2e of the case 2 so that the position of the heat radiating member 11 in the XY direction is defined.
- the surface opposite to the transport surface 1b of the cover 1 (the surface on the ⁇ Z side) is the opposite surface (the + Z side of the sensor substrate 3) to the surface in contact with the metal carrier 7 of the sensor substrate 3. Adhere to the surface.
- the cover 1 is attached so as to cover a part of the + Y side and ⁇ Y side side surfaces (surface parallel to the XZ plane) of the case 2.
- the signal processing board 13 is attached to the case 2 from the ⁇ Z side, and the + Z side surface (one surface in the Z direction) of the signal processing board 13 is brought into contact with the board mounting surface 2 f of the case 2. Then, the board mounting hole 13a of the signal processing board 13 and the board mounting hole 2g of the case 2 are overlapped, and the fastening member 8 is screwed into the board mounting hole 13a and the board mounting hole 2g. Thereby, the signal processing board 13 is positioned with respect to the case 2. Further, the cable 3 c is electrically connected to the signal processing board 13.
- the main heat sources in the magnetic sensor device 100 are the magnetoresistive element 4 and the signal amplification IC 5.
- the heat generated by the magnetoresistive effect element 4 and the signal amplification IC 5 is transmitted to the metal carrier 7 in contact with the magnetoresistive effect element 4 and the signal amplification IC 5.
- the metal carrier 7 is in contact with the sensor substrate 3, the case 2 and the magnet 9. Since the non-conductive portion 3a of the sensor substrate 3 is made of glass epoxy and does not contain a conductive metal, the non-conductive portion 3a has a relatively low thermal conductivity (the heat conduction of general glass epoxy). Rate: 0.4 [W / m ⁇ K]).
- the case 2 since the case 2 is made of a resin, the case 2 has a relatively low thermal conductivity (thermal conductivity of a general polycarbonate resin: 0.24 [W / m ⁇ K]).
- the magnet 9 is formed of a neodymium sintered magnet (thermal conductivity of a general neodymium sintered magnet: 6.5 [W / m ⁇ K]), and the thermal conductivity of the magnet 9 is a metal carrier. 7 and higher than the thermal conductivity of case 2. Therefore, most of the heat from the metal carrier 7 is transmitted to the magnet 9 (thermal conductivity of a general neodymium sintered magnet: 6.5 [W / m ⁇ K]).
- the magnet 9 is in contact with the metal carrier 7.
- the metal carrier 7 is in contact with the yoke 10 to which the heat radiating member 11 is attached. For this reason, the heat transmitted to the magnet 9 is transmitted to the metal carrier 7 and the yoke 10 and is radiated from the heat radiating member 11.
- the heat radiating member 11 is disposed in close contact with the ⁇ Z side of the magnetic circuit 30 (the side opposite to the conveyance path).
- the magnetoresistive effect element 4 and the signal amplification IC 5 are transmitted from the magnetoresistive element 4 and the signal amplification IC 5 in the order of the metal carrier 7, the magnet 9, and the yoke 10.
- the yoke 10 cannot transfer heat to the outside of the magnetic sensor device 200 except by heat radiation.
- the case 2 is made of resin, so the efficiency of heat dissipation is low.
- the heat generated by the magnetoresistive effect element 4 and the signal amplification IC 5 is not easily transmitted to the outside air, and the magnetic sensor device 200 is likely to become high temperature.
- the magnet 9 reaches a high temperature, the magnetism applied to the detection target becomes weak due to the demagnetizing action, and the performance of the magnetic sensor device 200 is degraded.
- the magnetic sensor device 100 according to the first embodiment since the heat dissipation member 11 is disposed in close contact with the magnetic circuit 30, the heat increase of the magnetic sensor device 100 is suppressed, and the magnet 9 A demagnetizing action due to heat can be suppressed, and a stable output without a decrease in sensitivity can be obtained.
- the case 2 is made of resin. However, it is not limited to this.
- the case 2 may be formed from a material having a high thermal conductivity such as a metal. In this case, since heat can be radiated to the outside air through the case 2, the heat dissipation efficiency can be further increased.
- FIG. 12 is a cross-sectional view of the magnetic sensor device 100A. 12, the same or corresponding components as those in FIG. 1 are denoted by the same reference numerals.
- the heat dissipation member 11 is exposed to the outside.
- regulating the position of the heat radiating member 11 is formed in case 2 of 100 A of magnetic sensor apparatuses.
- the opening of the hole 2 e is formed on the side surface on the ⁇ Y side of the case 2.
- the heat radiating member 11 is fitted from the opening of the hole 2e of the case 2 so that the position of the heat radiating member 11 in the XZ direction is defined.
- the position of the heat radiating member 11 in the Y-axis direction is defined by bonding the heat radiating member 11 to the ⁇ Y side surface of the magnet 9 and the yoke 10 constituting the magnetic circuit 30. That is, the heat radiating member 11 is in close contact with the side surface on the Y direction side of the magnetic circuit 30, which is a surface excluding the surface on the conveyance path side of the magnetic circuit 30.
- the heat generated by the magnetoresistive effect element 4 and the signal amplification IC 5 is sequentially transmitted to the metal carrier 7 and the magnet 9, and from the magnet 9 to the outside through the heat dissipation member 11. Radiated. Since heat is radiated to the outside without passing through the yoke 10, the thermal resistance until it is radiated to the outside can be reduced, and the efficiency of heat radiation can be improved. Further, unlike the magnetic sensor device 100 according to the first embodiment, the heat radiation member 11 is exposed to the outside, so that the signal processing board 13 does not hinder heat radiation to the outside. Therefore, in the second embodiment, the heat dissipation efficiency can be further improved.
- the magnetic sensor in which the heat dissipation member 11 is in close contact with the side surface on the Y direction side of the magnetic circuit 30 has been described.
- the heat dissipating member 11 may further be in close contact with both the surface of the magnetic circuit 30 opposite to the surface in the conveyance direction and the side surface of the magnetic circuit 30 on the Y direction side.
- FIG. 13A is a perspective view of a cross section of a part of the case 2 of the magnetic sensor device.
- FIG. 13B is a cross-sectional view of case 2 of the magnetic sensor device.
- FIG. 14 is a cross-sectional view of the magnetic sensor device.
- symbol is attached
- the heat radiating member 11 of the magnetic sensor device 100B is insert-molded in the case 2.
- the heat dissipating member 11 has a plurality of fins 11b protruding to the opposite side ( ⁇ Z side) to the conveyance path side.
- a plurality of fins 11b are arranged in the Y direction.
- the heat radiating member 11 is held in the case 2 by embedding both ends of the heat radiating member 11 on the + Y side and the ⁇ Y side in the case 2.
- the heat radiating member 11 is insert-molded in the case 2. For this reason, the number of parts of the magnetic sensor device 100B is reduced. Moreover, the operation
- the heat radiating member 11 is generally formed from a metal having high thermal conductivity, the rigidity of the case 2 can be increased by insert-molding the heat radiating member 11 into the case 2.
- the heat radiating member 11 is insert-molded in the case 2.
- the heat radiating member 11 may be integrally formed with the case 2 by a method other than insert molding.
- FIG. 15 is a perspective view with the board mounting surface of the case of the magnetic sensor device according to the fourth embodiment facing upward.
- FIG. 16 is a cross-sectional view of the magnetic sensor device according to the fourth embodiment. 15 and 16, the same reference numerals are given to the same or corresponding components as those in FIG. 1.
- an offset surface 2h offset in the + Z direction from the board mounting surface 2f is formed on the ⁇ Z side surface of the case 2 of the magnetic sensor device 100C shown in FIG.
- the offset surface 2h As shown in FIG. 16, the space near the heat radiating member 11 communicates with the outside. As a result, the efficiency of heat dissipation can be improved.
- FIG. 17 is a perspective view of a heat dissipation member of the magnetic sensor device according to the fifth embodiment.
- FIG. 18 is a cross-sectional view of the magnetic sensor device according to the fifth embodiment. 17 and 18, the same or corresponding components as those in FIG. 1 are denoted by the same reference numerals.
- the heat radiating member 11 of the magnetic sensor device 100D includes a plate-like base portion 11c having fins 11b formed on the surface on the ⁇ Z side, a magnet 9 and It has a pair of protrusions 11a (side wall portions) for defining the position of the yoke 10 in the Y direction.
- the protrusions 11 a are provided so as to protrude in the + Z direction from both ends in the Y direction of the base portion 11 c of the heat radiating member 11.
- the heat dissipation member 11 has the protrusion 11a. For this reason, it becomes possible to make the jig
- FIG. 19 is a perspective view of a heat radiating member of the magnetic sensor device according to the sixth embodiment.
- FIG. 20 is a cross-sectional view of the magnetic sensor device according to the sixth embodiment. 19 and 20, the same or corresponding components as those in FIG. 1 are denoted by the same reference numerals.
- the heat radiating member 11 includes a plate-like base portion 11c having fins 11b formed on the ⁇ Z side surface, and two fins extending from the + Y side and ⁇ Y side ends of the base portion 11c. 11b and a C-shaped channel.
- the heat dissipation member 11 has two fins 11b. For this reason, the shape of the heat radiating member 11 can be simplified, and the processing cost of the heat radiating member 11 can be reduced.
- the heat radiation member 11 of the magnetic sensor device 100 shown in the first embodiment is generally formed by extrusion because the number of fins 11b is large.
- it can manufacture by bending a board
- the processing cost can be reduced by setting the dimensions corresponding to the standard product of the C-type channel.
- FIG. 21 is a cross-sectional view of the magnetic sensor device according to the seventh embodiment.
- the magnetic sensor device 100F can be detected only when the detection target 20 is magnetized.
- FIG. 21 the same or corresponding components as those in FIG.
- the metal carrier 7 of the magnetic sensor device 100F is composed of one nonmagnetic plate, unlike the metal carrier 7 of the magnetic sensor device 100 according to the first embodiment.
- the magnetic carrier 7a has a role of adjusting the direction of the magnetic field of the magnet 9 in the Z direction.
- the metal carrier 7 may not have the magnetic carrier 7a.
- the heat dissipation efficiency can be improved.
- the magnetic carrier 7a is made of iron (general thermal conductivity: 84 [W / m ⁇ K]), and the non-magnetic carrier 7b. Is made of copper (general thermal conductivity: 398 [W / m ⁇ K]). Therefore, in the seventh embodiment of the present invention, the metal carrier 7 is composed only of the nonmagnetic carrier 7b having a high thermal conductivity, so that the heat dissipation efficiency can be improved.
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Abstract
Description
この発明の実施の形態1に係る磁気センサ装置及びそれらの製造方法について説明する。なお、全ての実施の形態において、検知対象物の搬送とは、検知対象物自体が搬送される場合に加え、検知対象物は動かずに、磁気センサ装置自体が搬送方向(図1のY方向)に動く場合も含むものとする。また、X方向を読み取り幅方向と称する。
また、磁気センサ装置100は、カバー1と、ケース2と、センサ基板3と、信号増幅IC(Integrated Circuit)5と、ワイヤ6と、締結部材8と、信号処理基板13とを備えている。
図1では、搬送方向21は+Y方向であるが、-Y方向でもよい。
すなわち、放熱部材11は、磁気回路30の搬送路側の面を除く面である、磁気回路30の搬送路側と反対側の面に密着している。
段2aは、センサ基板3、磁気抵抗効果素子4、信号増幅IC5及びワイヤ6と一体化された金属キャリア7をZ方向に支えるために用いられる。段2aは、ケース2の搬送路側に設けられている。
穴部2bは、+Z側の面に形成された開口部を有し、センサ基板3、磁気抵抗効果素子4、信号増幅IC5及びワイヤ6と一体化された金属キャリア7をXY方向に位置決めするために用いられる。穴部2bは、段2aを底部としてケース2の搬送路側(+Z側)に設けられている。
穴部2cは、一体化された磁石9及びヨーク10を配置し、XY方向の位置決めをするために用いられる。穴部2cは、穴部2bから穴部2eに貫通する貫通穴である。
穴部2eは、-Z側の面に形成された開口部を有し、放熱部材11をヨーク10に取り付けた際に放熱部材11のXY方向の位置決めをするために用いられる。穴部2eは、ケース2の搬送路側とは反対側(-Z側)の面に設けられている。
基板取付面2fは、検知対象物20の搬送路側とは反対側(-Z側)の面に設けられている。基板取付面2fは、信号処理基板13を取り付けるために用いられる。
基板取付穴2gは、信号処理基板13の位置決めしてケース2に固定するために用いられる。
これに対して、本実施の形態1に係る磁気センサ装置100では、放熱部材11が、磁気回路30に密着して配置されているため、磁気センサ装置100の熱上昇が抑制され、磁石9の熱による減磁作用を抑制でき、感度低下の無い、安定した出力を得ることができる。
本発明の実施の形態1では、放熱部材11が、磁気回路30の搬送路側の面とは反対側の面に密着している磁気センサ装置について説明した。実施の形態2では、放熱部材11が、磁気回路30の搬送路側の面とは反対側の面以外の面に密着している磁気センサ装置について説明する。
本発明の実施の形態2に係る磁気センサ装置について、図12を用いて、構成を説明する。図12は、磁気センサ装置100Aの断面図である。図12において、図1と、同一若しくは相当する構成要素には同一符号を付す。
すなわち、放熱部材11は、磁気回路30の搬送路側の面を除く面である、磁気回路30のY方向側の側面に密着している。
実施の形態2では、放熱部材11が、磁気回路30のY方向側の側面に密着している磁気センサについて説明した。放熱部材11は、さらに、磁気回路30の搬送方向側の面とは反対側の面及び磁気回路30のY方向側の側面の両方に密着する構成としてもよい。
次に、本発明の実施の形態3に係る磁気センサ装置について、図13A、図13B、図14を用いて、構成を説明する。図13Aは、磁気センサ装置のケース2の一部を断面とした斜視図である。図13Bは、磁気センサ装置のケース2の断面図である。図14は、磁気センサ装置の断面図である。図13A、図13B、図14において、図1と、同一若しくは相当する構成要素には同一符号を付す。
次に、本発明の実施の形態4に係る磁気センサ装置について、図15、図16を用いて説明する。図15は、実施の形態4に係る磁気センサ装置のケースの基板取付面を上側にした斜視図である。図16は、実施の形態4に係る磁気センサ装置の断面図である。図15、図16において、図1と、同一若しくは相当する構成要素には同一符号を付す。
次に、本発明の実施の形態5に係る磁気センサ装置について、図17及び図18を用いて説明する。図17は、実施の形態5に係る磁気センサ装置の放熱部材の斜視図である。図18は、実施の形態5に係る磁気センサ装置の断面図である。図17、図18において、図1と、同一若しくは相当する構成要素には同一符号を付す。
次に、本発明の実施の形態6に係る磁気センサ装置について、図19、図20を用いて説明する。図19は、実施の形態6に係る磁気センサ装置の放熱部材の斜視図である。図20は、実施の形態6に係る磁気センサ装置の断面図である。図19、図20において、図1と、同一若しくは相当する構成要素には同一符号を付す。
次に、発明の実施の形態7に係る磁気センサ装置について、図21を用いて説明する。図21は、実施の形態7に係る磁気センサ装置の断面図である。磁気センサ装置100Fは、検知対象物20が磁性を帯びている場合のみ、検知可能なものである。図21において、図1と、同一若しくは相当する構成要素には同一符号を付す。
Claims (16)
- 磁界を形成する磁気回路と、
前記磁界の変化を抵抗値の変化として出力し、前記磁気回路の検知対象物の搬送路側の面に載置された磁気抵抗効果素子と、
前記磁気回路の前記搬送路側の面を除く面に密着して配置された放熱部材と、
を備えた磁気センサ装置。 - 前記放熱部材は、前記磁気回路の前記搬送路側とは反対側の面に密着して配置された請求項1に記載の磁気センサ装置。
- 前記磁気回路は、
磁石と、
前記磁石の前記搬送路側の面に一方の面が密着し、他方の面に前記磁気抵抗効果素子が載置された金属キャリアと、
前記磁石の前記搬送路側とは反対側の面に一方の面が密着し、他方の面に前記放熱部材が密着したヨークと、
を備えた請求項2に記載の磁気センサ装置。 - 前記金属キャリアは、
前記磁気抵抗効果素子を載置した磁性体部と、
前記磁性体部に接合され、前記磁気抵抗効果素子に電気的に接続された信号処理部が載置された非磁性体部と、
を備えた請求項3に記載の磁気センサ装置。 - 前記金属キャリアは、前記磁気抵抗効果素子に電気的に接続された信号処理部が載置された非磁性体部から構成される請求項3に記載の磁気センサ装置。
- 前記放熱部材は、
前記搬送路側の面に平行、且つ、前記検知対象物の搬送方向に直交する方向に延在する一対の側壁部を備え、
一対の前記側壁部の間に前記ヨーク及び前記磁石が配置されている請求項3から5のいずれか1項に記載の磁気センサ装置。 - 前記放熱部材は、板状の基部と、前記基部の搬送方向両端から延設される一対のフィンと、を有する請求項3から5のいずれか1項に記載の磁気センサ装置。
- 前記搬送路側の面に平行、且つ、搬送方向に直交する方向に貫通する穴部が形成された筐体を備え、
前記穴部には、前記磁気回路、前記磁気抵抗効果素子及び前記放熱部材が収納されている請求項1から7のいずれか1項に記載の磁気センサ装置。 - 前記筐体の前記搬送路側とは反対側の面に、基板が取り付けられる基板取付面と、前記基板取付面から前記搬送路側にオフセットされたオフセット面と、が形成されている請求項8に記載の磁気センサ装置。
- 前記穴部の内周面には、前記放熱部材が接触している請求項8又は9に記載の磁気センサ装置。
- 前記放熱部材は、前記筐体にインサート成形されている請求項8から10のいずれか1項に記載の磁気センサ装置。
- 前記磁気回路は、
磁石と、
前記磁石の前記搬送路側の面に一方の面が密着し、他方の面に前記磁気抵抗効果素子が載置された金属キャリアと、
前記磁石の前記搬送路側とは反対側の面に一方の面が密着し、他方の面に前記放熱部材が密着したヨークと、
を備え、
前記放熱部材は、前記磁石の搬送方向に直交する方向の側面と、前記ヨークの前記搬送方向に直交する方向の側面とに亘って密着している請求項1に記載の磁気センサ装置。 - 前記金属キャリアは、
前記磁気抵抗効果素子を載置した磁性体部と、
前記搬送方向に延在し、前記磁性体部に接合され、前記磁気抵抗効果素子に電気的に接続された信号処理部が載置された非磁性体部と、
を備えた請求項12に記載の磁気センサ装置。 - 前記金属キャリアは、前記磁気抵抗効果素子に電気的に接続された信号処理部が載置された非磁性体部から構成される請求項12に記載の磁気センサ装置。
- 前記搬送路側の面に形成された第1の開口部を有する第1穴部と、
前記搬送路側と反対側の側に形成された第2の開口部を有する第2穴部と、
前記第1穴部から前記第2穴部に通じる第3穴部と、が形成された筐体を備え、
前記第2穴部の内部には前記放熱部材が配置され、前記第3穴部には、前記磁気抵抗効果素子及び前記磁気回路が配置されている請求項1、2及び12から14のいずれか1項に記載の磁気センサ装置。 - 筐体の、検知対象物の搬送路側の面に平行、且つ、前記検知対象物の搬送方向に直交する方向に貫通する穴部の内周面に、金属キャリアを固定するキャリア組立工程と、
前記金属キャリアの、前記搬送路側の面に磁気抵抗効果素子を実装するセンサ基板組立工程と、
磁石の、前記搬送路側とは反対側の面にヨークを密着させる磁石組立工程と、
放熱部材を前記ヨークに密着させる最終組立工程と、
を含む磁気センサ装置の製造方法。
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JP2017126265A (ja) * | 2016-01-15 | 2017-07-20 | 株式会社ヴィーネックス | 磁気センサ装置 |
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Also Published As
Publication number | Publication date |
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DE112015002893B4 (de) | 2024-04-25 |
US20190086237A1 (en) | 2019-03-21 |
JP6049948B2 (ja) | 2016-12-21 |
JPWO2015194605A1 (ja) | 2017-04-20 |
US20170153125A1 (en) | 2017-06-01 |
CN106461742B (zh) | 2019-05-28 |
CN106461742A (zh) | 2017-02-22 |
US10620015B2 (en) | 2020-04-14 |
DE112015002893T5 (de) | 2017-03-09 |
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