JPH09152304A - Detector for moving object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detector in which a magnetic conversion element can be arranged and installed in a proper place on the detection face of a resin case even when the shape of an object to be detected is different. SOLUTION: A magnetic conversion element 2 and an electronic component such as a capacitor or the like used to protect the magnetic conversion element 2 from a noise or the like are mounted on a circuit board 3. A resin case 1 comprises a guide wall 12 by which the circuit board 3 is guided to the side of an object, to be detected, so as to arrange and install the magnetic conversion element 2 in a prescribed position. When the resin case 1 is pressed along the guide wall 12, the magnetic conversion element 2 is arranged and installed in the prescribed position along the detection face 13 of the resin case 1, and the magnetic conversion element 2 is fixed when a filler 7 is filled into the resin case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving object detector for detecting a moving state of a moving object such as a gear or a multi-pole magnetized magnet.

[0002]

2. Description of the Related Art A moving object detector for detecting a moving distance and a moving speed (moving state of a moving object that makes a rotational movement) is disclosed in Japanese Patent Laid-Open No. 2-264817, which has a cylindrical resin case. , A lid body disposed on the upper end of the resin case and having a flat surface on the side to be detected, a magnetic conversion element mounted on the inner surface side of the lid body, and the magnetic conversion element fixed and held in the resin case The moving object detector is composed of a filling material made of epoxy or the like.

[0003]

When measuring a vehicle speed or a distance for a vehicle using such a moving object detector,
It is common to use a transmission gear or the like as an object to be detected to detect irregularities of the gear. However, the transmission gear is composed of various gears such as spur gears and bevel gears, and if the spur gears can be mounted with the moving object detector described above relatively easily, When detecting the uneven surface of, the moving object detector must be installed so that the magnetic conversion element is substantially parallel to and close to the uneven surface. There was a problem that I could not do it. In order to solve such problems,
Although the above-mentioned problem can be solved by forming the lid of the resin case described above so as to match the shape of the bevel gear (a shape that is substantially parallel to the uneven surface), the lid is tilted to the bevel gear. Since the resin case is formed so that
It becomes difficult to dispose the magnetic conversion element disposed on the inner surface side of the lid body at an appropriate position, and variations occur in the location where the magnetic conversion element is disposed. There was a problem that there was variation. Therefore, in order to solve the above-mentioned problems, the present invention allows the magnetic conversion element to be arranged at an appropriate position of the resin case even when the detected object has a different shape such as a spur gear or a bevel gear. An object detector is provided.

[0004]

In order to solve the above-mentioned problems, the present invention accommodates a magnetic conversion element for detecting a moving state of an object to be detected in a resin case, and the magnetic conversion element is detected by the resin case. In a moving object detector arranged at a predetermined position on the surface side, a circuit board on which electronic components such as a capacitor for protecting the magnetic conversion element and the magnetic conversion element from noise and the like are mounted, and the magnetic conversion element are set at predetermined positions. And a resin case having a guide portion disposed on the circuit board, and by pressing the circuit board along the guide portion, the magnetic conversion element is located at a predetermined position along the bottom surface of the resin case on the side of the detected body. It is provided.

At least one of the guide portion of the resin case and the circuit board is provided with an abutting portion for disposing the magnetic conversion element at a predetermined position of the resin case.

Further, the magnetic conversion element is provided with a magnet holder for mounting a magnet for applying a magnetic field, and the magnet holder is arranged on the circuit board, and the magnet holder presses the circuit board to press the magnetic board. The detection surface of the conversion element has a magnet mounting surface that comes into contact with the bottom surface of the resin case on the side of the detected body.

Further, the magnet holder has at least two different magnet mounting surfaces, and is attachable to and detachable from the circuit board.

Further, the circuit board holder is provided with a pressing portion for pressing the circuit board.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A resin case having a detection surface corresponding to the shape of an object to be detected and a magnetic conversion element are disposed on a magnet mounting surface, and the magnet mounting surface has substantially the same shape as the detection surface of the resin case. A magnet holder, a pressing portion for pressing the circuit board on which the magnet holder is arranged to the detection surface side of the resin case, and a routing path for routing an electric cord electrically connected to the circuit board. A moving object detector with a board holder for holding the circuit board,
By applying a predetermined pressing pressure to the pressing portion of the substrate holder and pressing the circuit board against the detection surface side of the resin case, variations occur in the lead homing of the magnetic conversion element, and the magnetic conversion element is the magnet. Even when the magnet mounting surface of the holder is lifted, the magnet mounting surface of the magnet holder and the detection surface of the resin case are substantially parallel to each other. Since the magnets are arranged at predetermined positions along the inner side (bottom surface), the magnets arranged in the magnet holders and the magnetic conversion elements do not vary in arrangement position in the height direction. The object to be detected can be measured accurately. In addition, stress is applied to an electric contact portion (soldering portion) between the electric cord and the circuit board by forming a routing path for routing the electric cord electrically connected to the circuit board in the board holder. Is reduced and the reliability of the electrical connection is improved.

Further, by forming a contact portion with the guide portion formed on the inner surface of the resin case on the circuit board, even when a pressure more than a predetermined pressure is applied to the pressing portion of the substrate holder, Since the contact portion of the circuit board comes into contact with the end of the guide portion formed to a predetermined position in the detection surface direction of the resin case to determine the position of the magnetic conversion element, an excessive pressing force is applied to the above. The magnetic conversion element is prevented from being damaged without being applied to the magnetic conversion element.

The magnet holder has at least two magnets.
Since different types of magnet mounting surfaces are provided so that they can be attached to and detached from the circuit board, even if the shape of the detection surface of the object to be detected is different, the components other than the resin case can be shared. Therefore, cost reduction can be achieved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the accompanying drawings.

The moving object detector of the present invention is shown in FIGS.
As shown in FIG. 1, a substantially cylindrical resin case 1 and a Hall IC
A circuit board 3 on which an electronic component (not shown) including a magnetic conversion element 2 and a magnetic conversion element 2 that prevent the magnetic conversion element 2 from noise and the like are mounted, and a magnet 4 that applies a magnetic field to the magnetic conversion element 2 are provided. Then, from the magnet holder 5 arranged on the circuit board 3, the board holder 6 holding the circuit board 3, and the filler 7 made of epoxy or the like for fixing the magnetic conversion element 2 in the resin case 1. It is configured.

The resin case 1 has, for example, a mounting piece 11 for mounting and fixing to a cover body (not shown) of a transmission or the like with a screw or the like, and an inner wall of the resin case 1 has a circuit board described in detail later. A guide wall (guide portion) 12 for guiding and supporting 3 to the bottom of the resin case 1 is formed to a predetermined position, and the mounting piece 11 and the guide wall 12 are integrally formed on the resin case 1. Such a resin case 1 has a detection surface (bottom surface) 13 corresponding to the shape of the object to be detected, and the thickness of this detection surface 13 is formed to be thinner than the thickness of the cylindrical side surface. ing. The detection surface 13 has a different shape depending on whether the shape of the object to be detected is, for example, a spur gear or a bevel gear (the angle of the detection surface 13 is changed according to the detection angle). Resin case 1 having detection surface 13 shown in FIGS.
Is used as a detected object, for example, when detecting a spur gear.

As shown in FIG. 3, the circuit board 3 is electrically connected to the land portion (not shown) by soldering the electric cord 8 for the power supply and the output of the magnetic conversion element 2 inputted from the outside. And an electric cord insertion hole 31 (for which a land is formed on the back surface), and a substrate holder 6 described in detail later.
And a notch 32 for positioning when arranging. Further, the circuit board 3 determines the position where the circuit board 3 is disposed with respect to the resin case 1 and the first contact portion 33 for determining the position when disposing the magnet holder 5 which will be described later in detail. Therefore, a second contact portion 34 that contacts the end of the guide wall 12 of the resin case 1 is formed.

As shown in FIGS. 4 and 5, the magnet holder 5 is made of a resin material and has a substantially semi-cylindrical shape having a mounting surface 51 which is substantially horizontal to the circuit board 3. One end surface (magnet mounting surface) 52 of the magnet holder 5 is a mounting surface 51.
To be a substantially vertical surface, and the other end surface (magnet mounting surface)
53 is formed to be an inclined surface having a predetermined angle with respect to the mounting surface 51. Each end face 52, 53 has a recess 54 for disposing the magnet 4, and above the recess 54, when the magnetic conversion element 2 is disposed, the end face 52, 53 and the magnetic conversion are formed. The detection surface of the element 2 is substantially the same surface, and a step portion 55 for contacting the detection surface of the magnetic conversion element 2 with the detection surface 13 of the resin case 1 is formed. Positioning unit 56 for determining the arrangement position of the conversion element 2
Are formed. On the other hand, a pair of arm pieces 57 having a substantially L-shaped cross section is formed integrally with the main body downward from the mounting surface 51 of the magnet holder 5, and the circuit board 3 is inserted into the pair of arm pieces 57. By doing so, the magnet holder 5 is disposed on the circuit board 3, and the side surface of each arm piece 57 is brought into contact with the first contact portion 33 of the circuit board 3, whereby the circuit board 3
The arrangement position of the magnet holder 5 with respect to is determined.

The magnet holder 5 having such end faces 52 and 53 has a mounting surface 51 when the object to be detected is, for example, a spur gear.
When the detected object is, for example, a bevel gear, the end surface 52 is inclined with respect to the mounting surface 51 so as to be on the side of the one end surface 52 which is a substantially vertical surface with respect to (FIG. 5A). The other end face that becomes
The circuit board 3 is detachable so that the 53 side ((b) in FIG. 5) is the detection surface 13 side of the resin case 1. However, although the other end surface 53 described above is an inclined surface having a predetermined angle, the inclination angle is the same as the detection surface 13 of the resin case 1.
It is necessary to roughly match the angle of.

As shown in FIGS. 6 and 7, the substrate holder 6 is attached to a soldering portion (which is soldered to a land portion (not shown) of the circuit board 8) by pulling the electric cord 8 upward. Routing path for bending the electric cord 8 with respect to the substrate holder 6 in consideration of the stress of
61 and a pair of receiving pieces 62 for supporting the circuit board 3 from below, and projections projecting upward at the tips of the receiving pieces 62.
Has 63. The circuit board 3 is mounted on the circuit board holder 6.
A pair of supporting pieces 64 for supporting the above from above, and a pressing portion 65 for pressing the circuit board 3 from above when filling the filling material in the manufacturing process described later, and each portion 6
1, 62, 63, 64 and 65 are integrally molded.

When the above-mentioned board holder 6 is arranged on the circuit board 3, the circuit board 3 supports the board holder 6 by supporting pieces.
The circuit board 3 is arranged so that the cutout portion 32 of the circuit board 3 fits into the protrusion 63 of the receiving piece 62 of the board holder 6 while lifting 64 upward.

As a method of manufacturing the moving object detector having such a structure, the positioning portion formed on the step portion 55 of the magnet holder 5 after the magnet 4 is disposed in the recess 54 of the magnet holder 5 is used.
The magnetic conversion element 2 is arranged at 56, and the leads of the magnetic conversion element 2 (leads electrically connected to the circuit board 3) are connected to the circuit board 3
Home in the direction. After that, the circuit board 3 is inserted until the first contact portion 33 formed on the circuit board 3 on which electronic components and the like are mounted contacts the measurement ends of the pair of arm pieces 57 of the magnet holder 5, and the magnetic conversion is performed. The leads of the element 2 are soldered to the land portion (not shown) formed on the back surface of the circuit board 3.

Then, after inserting the electric cord 8 into the cord insertion hole 31 of the circuit board 3 and soldering the electric cord 8 to the land on the back surface of the circuit board 3, the circuit board 3 is attached to the receiving piece 62 of the board holder 5. The protrusions 63 are arranged so that the cutout portions 32 of the circuit board 3 fit into each other, and the electric cord is routed along the routing route 61 of the substrate holder 5. And the circuit board 3
Along the guide wall 12 formed in the resin case 1,
These are stored in the resin case 1. After that, the pressing portion 65 formed on the substrate holder 6 is pressed with an appropriate pressure by a dedicated jig to temporarily fix the position of the magnetic conversion element 2 mounted on the circuit board 3 to the resin case 1. Then
By filling the resin case 1 with the filler 7, the position of the magnetic conversion element 2 with respect to the resin case 1 is fixed. The moving object detector is completed as described above.

Since the moving object detector having such a structure is provided with the resin case 1 and the magnet holder 5 corresponding to the shape of the object to be detected and the substrate holder 6, the lead homing of the magnetic conversion element 2 varies. Even if the magnetic conversion element 2 is lifted from the positioning portion 56 formed on the step portion 55, a predetermined pressing force is applied to the pressing force portion 65 of the substrate holder 6 to detect the circuit board 3 in the resin case 1. surface
By pressing it toward the 13 side, the end surface 52 (5
3) and the detection surface 13 of the resin case 1 are formed substantially parallel to each other, the magnetic conversion element 2 is
It is arranged along the inner side of 13 in the positioning portion 56 formed in the stepped portion 55 of the magnet holder 5, and since the arrangement location of the magnetic conversion element 2 does not vary, the detected object can be accurately measured. It can be measured. Also, the electric cord 8
Considering the stress on the soldering point between the circuit board 3 and
By forming the routing route 61 of the electric cord 8 in the substrate holder 6, the reliability of the electrical connection is improved.

Further, a pressing force higher than a predetermined value is applied to the substrate holder 6
Even when it is applied to the pressing portion 65 of the resin case 1, the detection surface of the resin case 1 is formed by forming the second contact portion 34 on the circuit board 3.
Second at the end of the guide wall 12 formed to a predetermined position in 13 directions
Since the contact portion 34 of the magnetic conversion element 2 contacts, the appropriate position of the magnetic conversion element 2 is determined at this contact position, and the pressing force is not applied to the magnetic conversion element 2 more than necessary. To prevent damage.

Further, since the magnet holder 5 can be attached to and detached from the circuit board 3, even if the shape of the object to be detected is different, a component of the moving object detector other than the resin case 1 (magnetic conversion element). 2, the circuit board 3, the magnet 4, the magnet holder 5, the board holder 6) can be shared.
A cost reduction can be achieved.

In this embodiment, the circuit board 3 is formed with the contact portion 34 with the resin case 1, but the guide wall 12 of the resin case 1 is not shown.
You may comprise so that a contact part may be provided.

Further, the magnet holder 5 of this embodiment has a mounting surface.
Although the end faces 52 and 53 having two different angles with respect to the 51 are provided, the circuit board 3 can be inserted from four directions with, for example, four angles with respect to the mounting surface 51. You can

Further, in the embodiment of the present invention, the pressing portion
The circuit board 3 was pressed against the detection surface 13 side of the resin case 1 by using the board holder 6 having the 65 formed, but it is not always necessary to use this board holder 6, and for example, the opening side of the resin case 1 The arrangement position of the magnetic conversion element 2 with respect to the resin case 1 may be determined by pressing the end portion of the circuit board 3.

Further, in this embodiment, the magnetic conversion element 2 is fixed by filling the resin case 1 with the filler 7, but the present invention is not limited to the above-mentioned embodiment, and for example, The circuit board 3 may be press-fitted into the guide wall formed in the resin case 1 to fix the arrangement position of the magnetic conversion element 2.

[0029]

According to the moving object detector of the present invention, the magnetic conversion element for detecting the moving state of the object to be detected is housed in the resin case, and the magnetic conversion element is placed at a predetermined position on the detected surface side of the resin case. In a moving object detector to be arranged, a circuit board on which electronic components such as a capacitor for protecting the magnetic conversion element and the magnetic conversion element from noise and the like are mounted, and a guide portion for arranging the magnetic conversion element at a predetermined position. A resin case having, and by pressing the circuit board along the guide portion, the magnetic conversion element is arranged at a predetermined position along the bottom surface of the resin case on the side of the detected body. In particular, a magnet holder that has a recess for mounting a magnet that applies a magnetic field to the magnetic conversion element and that is disposed on the circuit board is provided, and the magnet holder presses the circuit board. And a substrate holder in which a detection surface of the magnetic conversion element has a magnet mounting surface that abuts on a bottom surface of the resin case, which is a detection target side, and a pressing portion for pressing the circuit board is formed. Since the lead-homing of the magnetic conversion element varies due to the provision of the above, even if the magnetic conversion element is in a state of being lifted with respect to the magnet mounting surface, a predetermined pressing force is applied to the pressing portion of the substrate holder. In addition, by pressing the circuit board against the detection surface side of the resin case, the magnetic conversion element is arranged at a predetermined position of the magnet holder along the bottom surface of the resin case. It is possible to measure the object to be detected with high accuracy, because the locations where are not varied.

Further, by providing a contact portion for disposing the magnetic conversion element at a predetermined position of the resin case on at least one of the guide portion of the resin case or the circuit board, a pressing force of a predetermined amount or more can be obtained. Even when applied to the pressing portion of the substrate holder, the contact portion is formed, so that an excessive pressing force is not applied to the magnetic conversion element and damage to the magnetic conversion element can be prevented.

Further, since the magnet holder has at least two or more different magnet mounting surfaces and is attachable to and detachable from the circuit board, it is possible that the detection surface of the object to be detected has a different shape. Also, the components other than the resin case can be shared, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the embodiment.

FIG. 3 is a diagram showing a circuit board of the embodiment.

FIG. 4 is a sectional view of a main part of the magnet holder according to the embodiment.

FIG. 5 is a view showing a magnet holder according to the embodiment.

FIG. 6 is a view showing a substrate holder according to the above embodiment.

FIG. 7 is a cross-sectional view of a main part of the substrate holder according to the above embodiment.

[Explanation of symbols]

 1 Resin case 12 Guide wall (guide part) 13 Detection surface (bottom surface) 2 Magnetic conversion element 3 Circuit board 33 First contact part 34 Second contact part 4 Magnet 5 Magnet holder 51 Mounting surface 52, 53 End surface 54 Recessed portion 55 Stepped portion 56 Positioning portion 57 Arm piece 6 Board holder 61 Routing path 62 Receiving piece 63 Protrusion 64 Supporting piece 65 Pushing pressure portion 7 Filler

Claims (5)

[Claims] 1. A moving object detector in which a magnetic conversion element for detecting a moving state of an object to be detected is housed in a resin case and the magnetic conversion element is arranged at a predetermined position on the detected surface side of the resin case, A circuit board on which an electronic component such as a capacitor for protecting the magnetic conversion element or the magnetic conversion element from noise or the like is mounted; and a resin case having a guide portion for arranging the magnetic conversion element at a predetermined position, A moving object detector characterized in that the magnetic conversion element is arranged at a predetermined position along a bottom surface of the resin case on the side of the detected body by pressing the circuit board along a guide portion. 2. The moving object detector according to claim 1, wherein at least one of the guide portion of the resin case and the circuit board is used to contact the magnetic conversion element at a predetermined position of the resin case. A moving object detector characterized by comprising a section. 3. The moving object detector according to claim 1, further comprising a recess for mounting a magnet that applies a magnetic field to the magnetic conversion element, and a magnet holder arranged on the circuit board. Is a moving object detector, wherein a pressing surface of the circuit board has a magnet mounting surface that abuts a detection surface of the magnetic conversion element on a bottom surface of the resin case, which is a detection object side. 4. The moving object detector according to claim 1, wherein the magnet holder has at least two different magnet mounting surfaces, and is attachable to and detachable from the circuit board. A moving object detector characterized in that 5. The moving object detector according to claim 1, further comprising a substrate holder having a pressing portion for pressing the circuit board.