JP2008139032A - Mobile body detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain improvements in heat resistivity, waterproof performance, vibration resistivity, and reliability with simple constitution without increasing the number of components. <P>SOLUTION: The mobile body detection device comprises a magnetic sensing element 1 and a permanent magnet 2 for imparting the magnetic field on the same, a substrate 3 mounted with electronic components, and a holder 10 which is insert formed with resin so as to be provided with terminals 30 for lead out an output signal corresponding to the magnetic sensing element as well as holding the magnetic sensing element 1, the permanent magnet 2, and the substrate 3, and a resin case 20 engaged with the holder 10 while storing a part of the holder, and storing the magnetic sensing element 1, the permanent magnet 2 and the substrate 3. The case 20 is provided with a space V in the engaged condition with the holder 10 so that the curved and inflectional wavy part 31 may be formed in the region of the terminal 30 covered with the holder 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a moving body detection apparatus that magnetically detects a moving body that moves linearly or rotates, such as a rack or gear made of a magnetic body.

  In general, this type of moving body detection device uses a soft magnetic material, such as a rack or rotor (gear), which has a plurality of convex shapes, to linearly move or to move the detected object that moves in a rotating manner. The sensor detects the change in the magnetic field caused by the object to be detected by the magnetic sensing elements (Hall IC, etc.) and the permanent magnet built in the moving object detection device. This is a configuration for outputting a simple pulse signal.

  This moving body detection device can constitute a rotation detection sensor that generates a regular pulse signal in accordance with the rotation of the rotor, and this is used for applications such as a speed sensor of an automobile.

  In particular, in applications such as speed sensors for automobiles, it is assumed that they will be used in a poor environment. Sometimes, the environment changes temperature from a high temperature to a low temperature, or dust, sludge, etc. Used in places where splashes. Therefore, it is necessary to protect the components inside the moving object detection device from the intrusion of dust, water, sludge, etc. from the outside.

  In that case, since the material of the external output terminal is a metal with respect to the resin which is the exterior of the mobile body detection device, there is a risk of causing interface separation due to the difference in linear expansion caused by the heat of the two. When the interface peeling occurs, a minute gap is generated along the external output terminal, and there is a possibility that water, sludge and the like enter the moving body detection device. In particular, when there is a space containing air or the like inside the moving object detection device, when the moving object detection device is rapidly cooled after being exposed to high heat, the internal space side becomes negative pressure, and water, sludge, etc. It becomes easy to enter the moving body detection device through the output terminal.

  As known examples of conventional mobile body detection devices, there are Patent Document 1 and Patent Document 2 below.

JP 2004-309448 A JP 2000-214176 A

  In Patent Document 1, as shown in FIG. 8, an inner housing 53 provided with a magnetic detection means 50, a permanent magnet 51, and a circuit board 52, and a cap member 54 that covers the magnetic detection means 50, the permanent magnet 51, and the circuit board 52. Are connected by an outer housing 55. The inner housing 53 is formed by insert-molding lead terminals 56 connected to the circuit board 52.

  In the case of this Patent Document 1, the lead terminal 56 is arranged in an L shape, and the length of one side of the straight line is long, and the wire due to heat between the inner housing 53 made of resin and the lead terminal 56 made of metal. It is easy to be affected by thermal strain due to a difference in expansion, and a phenomenon that the lead terminal 56 is peeled off from the inner housing 53 easily occurs. In particular, since there is a space V inside the cap member 54, it is affected by the expansion and contraction of the air in the space, and external water, sludge, etc. are transmitted to the lead terminal 56 through the minute gap caused by the interface peeling during the contraction. Thus, there is a problem of entering the cap member 54.

  As shown in FIG. 9, Patent Document 2 has a structure in which a magnetic sensitive element 60, a permanent magnet 61, and a substrate 62 are supported by a holder 63 and stored in a case 64, and the case 64 is sealed with a resin 65. Also in this case, since the terminal 66 connected to the substrate 62 is arranged in an L shape in the resin 65, a problem of interface peeling between the terminal 66 and the resin 65 occurs. For this reason, in Patent Document 2, a grommet 67 made of an elastic material surrounding the terminal 66 and a cover grommet 68 that holds the elastic material are fitted into a case 64, and the fitting portion is sealed with a resin 65. Although the lead-out portion 66 has a watertight structure, the number of parts increases and the number of assembling steps increases, resulting in an increase in cost.

  As described above, in Patent Documents 1 and 2, since the terminals are arranged in an L shape in the resin, the terminal length of one linear side becomes long, and the linear expansion between the metal constituting the terminal and the resin Due to the difference, the structure is easily subjected to thermal strain, so that heat resistance, waterproofness, vibration resistance, and the like are lowered, which leads to lower reliability.

  Moreover, when using a grommet in order to improve waterproofness like patent document 2, a number of parts will increase and it will lead to a cost increase.

  In view of the above points, the present invention has a simple structure that does not increase the number of components, can improve heat resistance, waterproofness, and vibration resistance, and thus can improve reliability. An object of the present invention is to provide a body detection device.

  Other objects and novel features of the present invention will be clarified in embodiments described later.

To achieve the above object, a moving body detection apparatus according to a first aspect of the present invention includes a magnetic sensitive element, a magnetic field generator that applies a magnetic field to the magnetic sensitive element, a substrate on which electronic components are mounted,
A holder insert-molded with a resin so as to have a terminal for holding the magnetically sensitive element, the magnetic field generator and the substrate and leading out an output signal corresponding to the magnetically sensitive element output;
A resin case that fits with the holder and stores a part of the holder, and stores the magnetically sensitive element, the magnetic field generator, and the substrate;
The case has a space in the fitting state with the holder,
A wavy portion having a curved or bent portion is formed in a region covered with the holder of the terminal.

A moving body detection apparatus according to a second aspect of the present invention includes a magnetic sensitive element, a magnetic field generator that applies a magnetic field to the magnetic sensitive element, a substrate on which an electronic component is mounted,
A holder insert-molded with a resin so as to have a terminal for holding the magnetically sensitive element, the magnetic field generator and the substrate and leading out an output signal corresponding to the magnetically sensitive element output;
A resin case that fits with the holder and stores a part of the holder, and stores the magnetically sensitive element, the magnetic field generator, and the substrate;
The case has a space in the fitting state with the holder,
A through hole portion or an uneven portion is formed in a region covered with the holder of the terminal.

A moving body detection apparatus according to a third aspect of the present invention includes a magnetic sensitive element, a magnetic field generator that applies a magnetic field to the magnetic sensitive element, a substrate on which an electronic component is mounted,
A holder insert-molded with a resin so as to have a terminal for holding the magnetically sensitive element, the magnetic field generator and the substrate and leading out an output signal corresponding to the magnetically sensitive element output;
A resin case that fits with the holder and stores a part of the holder, and stores the magnetically sensitive element, the magnetic field generator, and the substrate;
The case has a space in the fitting state with the holder,
A roughening surface is formed in a region covered with the holder of the terminal.

  In the moving body detection device according to the first aspect, a through hole portion, a concavo-convex portion, or a roughened surface may be formed in a region covered with the holder of the terminal.

  According to the moving body detection apparatus of the present invention, it is possible to prevent peeling of the interface between a terminal (metal) and a holder (resin) obtained by insert molding due to thermal strain, that is, a difference in linear expansion, heat resistance and waterproofing. And vibration resistance can be improved. As a result, a highly reliable moving object detection device can be realized.

  Hereinafter, as a best mode for carrying out the present invention, an embodiment of a moving body detection apparatus will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of a moving body detection apparatus according to the present invention. The moving body detection apparatus includes a magnetic sensitive element 1 such as a Hall element or a Hall IC, and a magnetic field generator that applies a predetermined bias magnetic field thereto. As a permanent magnet 2, a substrate 3 on which electronic components are mounted, a resin holder 10, a resin case 20, and an external output terminal 30.

  The holder 10 is insert-molded with resin so as to have an external output terminal 30, and the magnetic sensitive element 1 and the permanent magnet 2 are fixed and held on the tip side of the holder 10, and the substrate 3 is a substrate of the holder 10. It is fixed and held on the upper side of the support part 11. The magnetic sensitive element 1 and the terminal 30 are electrically connected to the substrate 3.

  The substrate 3 on which the electronic component is mounted includes a signal processing circuit that processes (or protects) the output signal of the magnetic sensitive element 1, and the output signal (signal corresponding to the magnetic sensitive element output) of this signal processing circuit is the holder 10. It is led out to the outside through a terminal 30 penetrating through.

  The resin case 20 is water-tightly fitted to the fitting portion 12 of the holder 10 to house a part of the holder, and the magnetic sensitive element 1, the permanent magnet 2 and the substrate 3 are housed therein. Since the resin is not injected into the case, the case 20 has a space V inside when fitted to the holder 10.

  The terminal 30 is made of, for example, copper or copper alloy plated with Ni or Sn, and is arranged in an L shape with respect to the holder 10 (not shown, but the terminal 30 is arranged in the thickness direction of the holder 10 (on the paper surface). As shown in the prior art, the length of one side of the terminal becomes long, and the resin holder 10 and metal are arranged in parallel in the vertical direction). There is a possibility that thermal distortion occurs due to the difference in linear expansion due to the heat of the terminal 30, and the interface between the insert-molded holder 10 and the terminal 30 is peeled off.

  In order to avoid this phenomenon, in the present embodiment, at least one corrugated portion 31 having a curved portion is formed in the region covered with the holder 10 of the terminal 30. By providing the wave-shaped portion 31, the length of one side of the terminal 30 is shortened, and the terminal itself has a spring shape, thereby reducing stress due to thermal expansion. In addition, durability against vibration is increased.

  According to the first embodiment, the following effects can be obtained.

(1) The holder 10 is manufactured by insert molding with resin so as to have the external output terminal 30. By providing at least one wave-shaped portion 31 with a curved portion in the external output terminal 30, the terminal 30 Since the length of one straight side can be shortened and the terminal itself has a spring shape, stress due to thermal expansion and stress due to vibration can be alleviated. Therefore, the interfacial debonding phenomenon can be avoided in the region where the wave-shaped portion 31 is formed, and the heat resistance, waterproofness and vibration resistance can be improved, and as a result, the reliability can be improved.

(2) Since the space between the external output terminal 30 and the holder 10 can be kept watertight, it is not necessary to dispose an elastic grommet around the external output terminal in order to ensure waterproofness. It can be set as a structure and cost reduction is possible.

(3) Heat resistance, waterproofness, and vibration resistance can be improved only by changing the external output terminal, the same molding conditions as conventional products with the same external shape can be maintained, and processing with existing molding machines is possible, which is wasteful No expensive expenses.

  FIG. 2 shows a second embodiment of the present invention. In this case, in the region covered with the holder 10 of the external output terminal 30, at least one angular wave-shaped portion 32 having a bent portion 32a is formed. By providing the square wave-shaped portion 32, the length of one side of the terminal 30 is shortened, and the terminal itself has a spring shape, so that stress due to thermal expansion can be alleviated. In addition, durability against vibration is increased.

  Other configurations and operational effects are the same as those of the first embodiment described above, and the same or corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  FIG. 3 shows a third embodiment of the present invention. In this case, a large number of through-hole portions 33 are formed in the region covered with the holder 10 of the external output terminal 30.

  Conventionally, since the terminal surface is smooth and dense, the adhesion with the resin is poor, and the interface is easily peeled off due to thermal strain. In this embodiment, after the numerous through-hole portions 33 are provided, By producing the holder 10 by insert-molding the external output terminal 30 with resin, the resin enters the numerous through-hole portions 33, the adhesion between the terminal 30 and the holder 10 is improved, and the interface caused by thermal strain The peeling phenomenon can be avoided. In addition, durability against vibration is increased.

  Other configurations are the same as those of the first embodiment described above, and the same or corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  According to the third embodiment, the following effects can be obtained.

(1) The external output terminal 30 provided with a large number of through-hole portions 33 is insert-molded with resin to produce the holder 10. In the region of the external output terminal 30 covered with the holder 10, a large number of through-holes are formed. Resin enters the portion 33, the adhesion between the terminal 30 and the holder 10 can be improved, and interface peeling due to thermal strain can be prevented. Therefore, heat resistance, waterproofness, and vibration resistance can be improved, and as a result, reliability can be improved.

(2) Since the space between the external output terminal 30 and the holder 10 can be kept watertight, it is not necessary to dispose an elastic grommet around the external output terminal in order to ensure waterproofness. It can be set as a structure and cost reduction is possible.

(3) Heat resistance, waterproofness, and vibration resistance can be improved only by changing the external output terminal, the same molding conditions as conventional products with the same external shape can be maintained, and processing with existing molding machines is possible, which is wasteful No expensive expenses.

  FIG. 4 shows a fourth embodiment of the present invention. In this case, in the region covered with the holder of the external output terminal 30, a large number of non-through holes 34 are formed on the terminal surface, and the terminal surface has an uneven shape. By forming a holder by molding the external output terminal 30 after providing a large number of non-penetrating hole portions 34 and making it a concavo-convex surface with resin, the resin enters the hole portion 34, and between the terminal 30 and the holder Adhesiveness is improved, and an interfacial debonding phenomenon due to thermal strain can be avoided. In addition, durability against vibration is increased.

  Other configurations and operational effects are the same as those of the third embodiment described above, and the same or corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 shows a fifth embodiment of the present invention. In this case, in the region covered with the holder of the external output terminal 30, a large number of concave portions 35 are formed on the terminal surface, and the terminal surface has an uneven shape. By forming a holder by molding the external output terminal 30 having a concave and convex surface by providing a large number of concave portions 35 with resin, the resin enters the concave portion 35 and the adhesion between the terminal 30 and the holder becomes good. , It is possible to avoid the interfacial delamination phenomenon caused by thermal strain. In addition, durability against vibration is increased.

  Other configurations and operational effects are the same as those of the third embodiment described above, and the same or corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  FIG. 6 shows a sixth embodiment of the present invention. In this case, in the region covered with the holder of the external output terminal 30, a large number of minute convex portions 36 are formed on the terminal surface by knurling or the like, and the terminal surface has an uneven shape. The external output terminal 30 that has been provided with a large number of pointed micro-projections 36 to form a concavo-convex surface is insert-molded with resin to produce a holder, so that the pointed micro-projections 36 enter the resin, and the terminal 30 and the holder The interfacial debonding phenomenon caused by thermal strain can be avoided. In addition, durability against vibration is increased.

  Other configurations and operational effects are the same as those of the third embodiment described above, and the same or corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  FIG. 7 shows a seventh embodiment of the present invention. In this case, a roughened surface 37 having a required roughness is formed at least in a region covered with the holder of the external output terminal. By making the external output terminal insert-molded with resin after making the terminal surface roughened surface 37, the contact area between the terminal surface and the resin is increased, and the adhesion between the terminal and the holder is improved. , It is possible to avoid the interfacial delamination phenomenon caused by thermal strain. In addition, durability against vibration is increased.

  The roughened surface 37 can be formed by sandblasting, etching (chemical treatment), depositing a concavo-convex film, or the like. In this case, if the electrical connection function of the external output terminal is not impaired, the roughening surface 37 may be formed on the entire surface of the terminal.

  Other configurations and operational effects are substantially the same as those of the above-described sixth embodiment.

  In the case of Embodiments 4 to 7, the non-penetrating hole 34, the concave portion 35, the sharp minute convex portion 36, and the roughening surface 37 are provided only on one side of the external output terminal. You may provide them.

  Further, the shape of the external output terminal of the above-described first and second embodiments further includes the structure of the through hole portion of the third embodiment, the structure having the uneven portions of the fourth to sixth embodiments, or the roughening of the seventh embodiment. A structure having a processing surface may be applied.

  Although the embodiments of the present invention have been described above, it will be obvious to those skilled in the art that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims.

It is a sectional side view which shows Embodiment 1 of the mobile body detection apparatus which concerns on this invention. It is a sectional side view which shows Embodiment 2 of this invention. It is Embodiment 3 of this invention, Comprising: It is a sectional side view which expands and shows an external output terminal. It is Embodiment 4 of this invention, Comprising: It is a perspective view which expands and shows an external output terminal. It is Embodiment 5 of this invention, Comprising: It is a perspective view which expands and shows an external output terminal. It is Embodiment 6 of this invention, Comprising: It is a perspective view which expands and shows an external output terminal. It is Embodiment 7 of this invention, Comprising: It is a photograph figure which expands and shows the surface of an external output terminal. It is a sectional side view for demonstrating the structure of patent document 1. FIG. It is a sectional side view for demonstrating the structure of patent document 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetosensitive element 2 Permanent magnet 3 Board | substrate 10 Holder 11 Board | substrate support part 12 Fitting part 20 Resin case 30 External output terminal 31 Wave-shaped part 32 Angular wave-shaped part 32a Bending part 33 Through-hole part 34 Non-through-hole part 35 Concave part 36 Minute convex portion 37 Roughening surface V space

Claims (4)

A magnetic sensitive element, a magnetic field generator for applying a magnetic field to the magnetic sensitive element, a substrate on which electronic components are mounted,
A holder insert-molded with a resin so as to have a terminal for holding the magnetically sensitive element, the magnetic field generator and the substrate and leading out an output signal corresponding to the magnetically sensitive element output;
A resin case that fits with the holder and stores a part of the holder, and stores the magnetically sensitive element, the magnetic field generator, and the substrate;
The case has a space in the fitting state with the holder,
A moving body detection apparatus, wherein a wave-shaped portion having a curved or bent portion is formed in an area covered with the holder of the terminal. A magnetic sensitive element, a magnetic field generator for applying a magnetic field to the magnetic sensitive element, a substrate on which electronic components are mounted,
A holder insert-molded with a resin so as to have a terminal for holding the magnetically sensitive element, the magnetic field generator and the substrate and leading out an output signal corresponding to the magnetically sensitive element output;
A resin case that fits with the holder and stores a part of the holder, and stores the magnetically sensitive element, the magnetic field generator, and the substrate;
The case has a space in the fitting state with the holder,
A moving body detecting apparatus, wherein a through hole or an uneven portion is formed in an area of the terminal covered with the holder. A magnetic sensitive element, a magnetic field generator for applying a magnetic field to the magnetic sensitive element, a substrate on which electronic components are mounted,
A holder insert-molded with a resin so as to have a terminal for holding the magnetically sensitive element, the magnetic field generator and the substrate and leading out an output signal corresponding to the magnetically sensitive element output;
A resin case that fits with the holder and stores a part of the holder, and stores the magnetically sensitive element, the magnetic field generator, and the substrate;
The case has a space in the fitting state with the holder,
A moving body detection apparatus, wherein a roughening surface is formed in a region covered with the holder of the terminal.   The moving body detection apparatus according to claim 1, wherein a through-hole portion, a concavo-convex portion, or a roughening treatment surface is formed in a region covered with the holder of the terminal.