JP2011145188A - Moving body detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moving body detector capable of simplifying manufacturing processes with a one-time application sufficient for an adhesive member by fixing a magnetic detection element to a circuit board and a permanent magnet to a housing chamber. <P>SOLUTION: A sensor section 1 includes the magnetic detection element 5, the permanent magnet 6 for providing the magnetic detection element 5 with magnetic fields, and the circuit board 7 connected to the magnetic detection element 5. A housing 10 includes both of the housing chamber 2 for housing the sensor section 1 and a connector part 4 of a terminal 3 for outside derivation. A cover member 9 covers the housing chamber 2. The adhesive member 8 fixes the magnetic detection element 5 to the circuit board 7 and fixes the permanent magnet 6 to the housing chamber 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a moving object detection device such as a rotation detection device that detects the movement of an object to be detected (such as a gear).

  As a conventional rotation detection device, one disclosed in Patent Document 1 is known. Such a rotation detection device is provided in the sensor body of the rotation detector in which the storage chamber of the sensor unit and the receptacle part of the terminal for external drawing are integrally molded by resin, and an intermediate part of the terminal for external drawing. The sensor body is formed by secondarily molding the outer side of the primary mold molded body. Such a rotation detection device has a structure in which a storage chamber and a permanent magnet, a permanent magnet and an IC, and a substrate and an arrangement portion are fixed by a silicone-based adhesive.

Japanese Patent Laid-Open No. 11-325961

However, such a rotation detection device has a problem in that the application of the silicone-based adhesive is required a plurality of times, which increases the manufacturing process and complicates it.
The present invention has been made in view of this problem, and provides a moving body detection apparatus that can apply the adhesive member only once and can simplify the manufacturing process.

  In order to achieve the above object, the present invention provides a sensor unit 1 having a magnetic detection element 5, a permanent magnet 6 for applying a magnetic field to the magnetic detection element 5, and a circuit board 7 connected to the magnetic detection element 5. A housing 10 in which a housing chamber 2 for housing the sensor unit 1 and a connector portion 4 of a terminal 3 for external drawing are integrally molded with resin, a cover member 9 for covering the housing chamber 2, and the magnetic detection element And an adhesive member 8 for fixing the permanent magnet 6 to the storage chamber 2.

  In addition, the present invention provides a moving object detection in which the storage chamber 2 of the sensor unit 1 and the connector unit 4 of the terminal 3 for external drawing are integrally molded with resin, and the storage chamber 2 is covered with a cover member 9. In the apparatus, the sensor unit 1 includes a magnetic detection element 5, a permanent magnet 6, and a circuit board 7 that electrically connects the terminal 3 and the magnetic detection element 5, and the storage chamber 2 includes the permanent magnet. 6, a recess 2 a for disposing 6, a disposition position of the magnetic detection element 5 with respect to the permanent magnet 6, a frame portion 2 c having a notch 2 b formed in a part thereof, and a frame portion 2 c The circuit board 7 includes an opening 7a through which the frame 2c is inserted, the terminal 3 and the magnetic circuit. Electrical detection element 5 The permanent magnet 6 is arranged so that a part of the permanent magnet 6 protrudes in the recess 2a or embedded in the recess 2a, and the circuit board is connected to the first and second connection lands 7b and 7c. 7 is arranged in the arrangement part 2d so that the frame part 2c is inserted through the opening 7a, and the first connection land 7b is electrically connected to the terminal 3, and the magnetic detection The element 5 is disposed in the frame portion 2c, and is electrically connected to the second connection land 7c of the circuit board 7 and has an adhesive member 8 applied on the magnetic detection element 5 by a predetermined amount. The adhesive member 8 has an excess adhesive member 8a disposed on the magnetic detection element 5 on the circuit board 7 when the cover member 9 is adhered to the main body so as to cover the storage chamber 2. While expanding, the notch 2 By the reaching the permanent magnet 6, the magnetic detecting element 5 is fixed to the circuit board 7, in which to fix the permanent magnets 6 in the recess 2a.

  By fixing the magnetic detection element to the circuit board and fixing the permanent magnet to the storage chamber, the application of the adhesive member can be performed only once, and the manufacturing process can be simplified.

Sectional drawing of the moving object detection apparatus of embodiment of this invention. The top view of the moving object detection apparatus of embodiment same as the above. The principal part enlarged view of the moving object detection apparatus of embodiment same as the above.

Hereinafter, an embodiment in which the present invention is applied to a rotation detection device will be described with reference to the accompanying drawings. In FIG. 2, the adhesive member 8 and the cover member 9 are omitted for easy understanding.
In the rotation detection device, the storage chamber 2 of the sensor unit 1, the terminal 3 for external drawing, and the connector unit 4 are integrally molded with resin.

  The sensor unit 1 includes a magnetic detection element 5, a permanent magnet 6 that applies a magnetic field to the magnetic detection element 5, and a circuit board 7 that electrically connects the terminal 3 and the magnetic detection element 5. The magnetic detection element 5 has a terminal portion 5 a that is electrically connected to the circuit board 7, and is disposed in the state of being close to the cover member 9. The terminal 3 is composed of three bent lead frames, and the other end 3b of the terminal 3 is electrically connected to the circuit board 7 by solder. The connector part 4 is for connecting and transmitting the output from the sensor part 1 to an external device. The magnetic detection element 5 converts a change in magnetic force associated with the rotation of the detected object into an electric signal and outputs it to the outside via the one end 3 a of the terminal 3.

  The storage chamber 2 includes a recess 2 a for disposing the permanent magnet 6, a frame portion 2 c for determining the disposition position of the magnetic detection element 5 with respect to the permanent magnet 6, and a disposition portion 2 d for positioning and arranging the circuit board 7. I have. The frame portion 2 is formed with a plurality of cutout portions 2b. The permanent magnet 6 is arranged so that a part of the permanent magnet 6 protrudes into the recess 2a.

  The circuit board 7 includes an opening 7 a through which the frame 2 c is inserted, and first and second connection lands 7 b and 7 c that are electrically connected to the terminal 3 and the magnetic detection element 5. The circuit board 7 is disposed in the disposition portion 2d so that the frame portion 2c is inserted through the opening 7a. The first connection land 7 b of the circuit board 7 is electrically connected to the terminal 3. The magnetic detection element 5 is disposed in the frame portion 2 c and is electrically connected to the second connection land 7 c of the circuit board 7.

  The housing 10 is a structure in which a connector portion 4 having terminals 3 for external drawing is integrally formed. A housing chamber 2 is provided on the opposite side of the connector portion 4 of the housing 10, and the sensor portion 1 is fixed to the housing chamber 2. An annular groove 12 is formed on the outer peripheral surface 10 a of the housing 10. The annular groove 12 is provided in the middle of the housing 10. The annular groove 12 is fitted with an O-ring 13 that is a sealing member. The cover member 9 has a disk shape.

  The adhesive member 8 is applied to the magnetic detection element 5 in a predetermined amount, and when the cover member 9 is bonded to the housing 10 so as to cover the storage chamber 2, the surplus adhesive member 8a disposed on the magnetic detection element 5 is While spreading on the circuit board 7 and reaching the permanent magnet 6 from the notch 2b, the magnetic detection element 5 is fixed to the circuit board 7 and the permanent magnet 6 is fixed to the recess 2a. The housing 10 and the cover member 9 are fixed by laser welding.

According to the present embodiment, the magnetic detection element 5 is fixed to the circuit board 7 and the permanent magnet 6 is fixed to the storage chamber 2 so that the adhesive member 8 can be applied only once. Can be simplified.
In addition, this invention is not limited to this embodiment, A various deformation | transformation is possible. For example, although the permanent magnet 6 in this embodiment is arrange | positioned so that the part may protrude in the recessed part 2a, you may embed the permanent magnet 6 in the recessed part 2a.

DESCRIPTION OF SYMBOLS 1 Sensor part 2 Storage chamber 2a Recessed part 2b Notch part 2c Frame part 2d Arrangement part 3 Terminal 4 Connector part 5 Magnetic detection element 6 Permanent magnet 7 Circuit board 7a Opening part 7b Connection land 7c Connection land 8 Adhesive member 8a Excess adhesive member 9 Cover member

Claims (2)

  A sensor unit having a magnetic detection element, a permanent magnet for applying a magnetic field to the magnetic detection element, and a circuit board connected to the magnetic detection element; a storage chamber for storing the sensor unit; and a connector unit for a terminal for external drawer. A housing integrally molded with resin, a cover member covering the storage chamber, and an adhesive member for fixing the magnetic detection element to the circuit board and fixing the permanent magnet to the storage chamber. A moving object detection device characterized by that. In the moving object detection device in which the storage chamber of the sensor portion and the connector portion of the terminal for external drawing are integrally molded with resin, and the storage chamber is covered with a cover member,
The sensor unit includes a magnetic detection element, a permanent magnet, and a circuit board that electrically connects the terminal and the magnetic detection element,
The storage chamber defines a recess for disposing the permanent magnet, a disposition position of the magnetic detection element with respect to the permanent magnet, a frame portion in which a notch is formed in a part thereof, An arrangement portion provided outside and positioning the circuit board in the storage chamber.
The circuit board has an opening through which the frame portion is inserted, and first and second connection lands that are electrically connected to the terminal and the magnetic detection element,
The permanent magnet is disposed so that a part of the permanent magnet protrudes into the recess, or embedded in the recess,
The circuit board is disposed in the disposition portion so that the frame portion is inserted from the opening, and the first connection land is electrically connected to the terminal,
The magnetic detection element is disposed in the frame portion and electrically connected to the second connection land of the circuit board,
An adhesive member applied on the magnetic detection element by a predetermined amount
When the cover member is bonded to the main body so as to cover the storage chamber, the excessive bond member disposed on the magnetic detection element spreads on the circuit board, and from the notch A moving object detection device characterized in that, when reaching the permanent magnet, the magnetic detection element is fixed to the circuit board, and the permanent magnet is fixed to the recess.

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