JPH09101358A - Magnetic sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic sensor which can be accurately translated when adjusting the position of a magnetic sensor element, has a less number of parts, has a simple structure, and can be easily manufactured. SOLUTION: The magnetic sensor has a magnetic sensor element 15 where a magnetic resistance pattern and a plurality of electrode patterns led from the magnetic resistance pattern are provided on the surface of a flat-plate-shaped substrate and four metal terminals 20 which consists of a metal plate and where a clip part 201 in a shape for pinching the lower edge side of the magnetic sensor element 15 at one edge. The lower side of the magnetic sensor element 15 is pinched at every specific interval, by the clip part 201 of each metal terminal 20 and at the same time, each clip part 201 is pressed against a plurality of electrode patterns for fixing. Position adjusting plates 207 protruding from the metal terminal 20 toward both outer sides are provided at the metal terminal 20 located at both side edges within the four metal terminals 20. The position of the magnetic sensor element 15 is adjusted by simultaneously pressing (or pulling) the both position adjusting plates 207 forward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic sensor.

[0002]

2. Description of the Related Art Conventionally, magnetic sensors for detecting the state of a magnetic field using a magnetic resistance have been developed and used for various electronic devices.

FIG. 7 is a diagram showing one example of use of this type of conventional magnetic sensor. FIG. 7A is a plan view, and FIG. 7B is a sectional view taken along line aa of FIG. FIG.

In FIG. 1, reference numeral 100 denotes a surface-facing brushless DC motor used for a VTR or the like. A magnet 113 for detecting the rotation speed of the rotating disk 111 is provided on the outer peripheral side surface of the rotating disk 111 of the motor. Installed. Further, at a position close to the magnet 113,
A magnetic sensor 117 that detects the magnetism of the magnetic head is mounted on the fixed plate 101.

The magnetic sensor 117 is constructed by attaching a flat magnetic sensor element 117a to a resin holder 117b. Four metal terminals 11 of magnetic sensor 117
7c is a solder 119 (FIG. 7) attached to a circuit pattern (not shown) provided on the fixed plate 101 on the back side of the holder 117b.
(See (b)).

The position of the magnetic sensor 117 is adjusted by the holder 1
The magnetic sensor 117 is rotated in the direction of arrow b around the protrusion 117d provided near one end of the lower surface of the holder 17b to adjust the magnetic sensor 117 to an optimum position, and then inserted into the through hole 117e provided near the other end of the holder 117b. 118 (indicated by a dotted line) is screwed into the fixing plate 101 and fixed.

In order for the magnetic sensor 117 to accurately detect the magnetic field generated by the magnet 113, the surface of the magnetic sensor element 117a must be exactly parallel to the tangential surface of the outer peripheral side surface of the magnet 113. No.

[0008]

However, the above-mentioned prior art has the following problems. Since the position adjustment of the magnetic sensor 117 is performed by rotating about the protrusion 117d, it is difficult to make the surface in the tangential direction of the outer peripheral side surface of the magnet 113 exactly parallel to the surface of the magnetic sensor element 117a. This adversely affects the sensitivity of the magnetic sensor.

The number of parts is large, the structure is complicated, and the manufacturing cost is increased.

On the other hand, in order to solve such a problem, the present applicant proposed a magnetic sensor 80 having a structure shown in FIG. 8 in an application of Japanese Patent Application No. 6-315649.

This magnetic sensor 80 has a flat magnetic sensor element 81 and a plurality of metal terminals 85 provided with a clip portion 83 at one end of a resilient metal plate to hold the lower end of the magnetic sensor element 81. The clip portion 83
The lower end of the magnetic sensor element 81 is held at the same time, and at the same time, the tip of the clip portion 83 is pressed against an electrode pattern 87 provided on the surface of the magnetic sensor element 81 and fixed with solder 89.

The position of the magnetic sensor 80 is adjusted by
The rear end of the metal terminal 85 placed on the fixing plate 93 is soldered 91
Then, the position of the magnetic sensor element 81 is advanced by pressing a portion indicated by an arrow in FIG. Finally, the portion of the clip portion 83 that contacts the fixing plate 93 is fixed with an adhesive or solder.

According to this method, since the magnetic sensor element 81 can be moved in parallel substantially forward and backward, it is more preferable than the conventional example. Further, the structure is simple and the number of parts is small as compared with the conventional example.

However, in the magnetic sensor 80, when the portion of the metal terminal 85 indicated by the arrow is pressed, the magnetic sensor element 81 does not move in parallel due to the shape of the metal terminal 85. As shown in the figure, there is a possibility that the lower end side of the magnetic sensor element 81 moves forward more than the upper end side (the inclination angle is shown larger than the actual one in the figure). In such a case, the sensitivity of the magnetic sensor element 81 cannot be optimized.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to accurately perform parallel movement when adjusting the position of a magnetic sensor element, and to reduce the number of parts, to have a simple structure and to facilitate manufacture. To provide a simple magnetic sensor.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a magnetic sensor element comprising a plate-like substrate provided with a magnetoresistive pattern and a plurality of electrode patterns drawn from the magnetoresistive pattern. And a plurality of metal terminals formed of an elastic metal plate and provided at one end thereof with a clip portion having a shape for sandwiching the lower end side of the magnetic sensor element, wherein the clip portion of each metal terminal includes a magnetic sensor element. At the same time, the lower side is held at predetermined intervals, and at the same time, each clip portion is pressed into contact with the plurality of electrode patterns and fixed, and further, the metal terminals at both ends of the plurality of metal terminals are connected to both outer sides from the metal terminals. A position adjustment plate projecting toward is provided.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a view showing a first embodiment of the present invention. FIG. 1A is a schematic perspective view, and FIG.
Is a side view.

As shown in FIG. 1, this magnetic sensor 10
A clip portion 201 provided at one end of each of the four metal terminals 20 is attached to the lower end of the flat magnetic sensor element 15. Hereinafter, each component will be described.

FIG. 2 is a perspective view showing the magnetic sensor element 15. As shown in the figure, a magnetic sensor element 15 has a desired magnetoresistive pattern 153 on the surface of a substrate 151 made of flat glass, silicon or ceramic.
It is configured by forming four electrode patterns 155 drawn from the magnetoresistive pattern 153. The four electrode patterns 155 are provided near the lower edge of the substrate 151.

The length, width and thickness of the substrate 151 are 3.3 m / m × 2.7 m / m × 0.7 m / m.

The magnetoresistive pattern 153 is formed by vacuum-depositing permalloy (nickel-iron alloy) or nickel-cobalt alloy on the substrate 151, and the electrode pattern 155 is formed by vacuum-depositing copper on the substrate 151. You.

Returning to FIG. 1, the metal terminal 20 is formed by plating the entire phosphor bronze with solder and has a thickness of 0.1 m / m.
An elastic metal plate having a length of about m is provided at one end thereof with a clip portion 201 which is bent in a substantially U-shape. The rear side of the clip portion 201 is bent at a right angle in a direction away from the magnetic sensor element 15, and further protrudes upward. A fixed end portion 203 which is bent in an arc shape so as to be further lowered to almost the same position as a position coinciding with the lowest position of the clip portion 201 and then further extends rearward at the height is provided. I have.

On the other hand, two metal terminals 20 located at both side ends of the four metal terminals 20 are provided with position adjusting plates 207 projecting outward from the two metal terminals 20, respectively. .

This position adjusting plate 207 is
The first magnetic sensor element 15 protrudes from a portion located on the back surface side, has an L-shape, and is formed by bending its front end rearward at a right angle.

The portion of the position adjusting plate 207 that is parallel to the surface of the magnetic sensor element 15 is hereinafter referred to as a position adjusting portion 209, and the portion of the lower end thereof bent at a right angle is hereinafter referred to as the fixing portion 21.
Called 1. The position of the surface of the fixing part 211 coincides with the lowest position of the clip part 201.

The magnetic sensor 10 is manufactured by using the clip portions 201 of the four metal terminals 20 for the magnetic sensor element 1.
5, each clip portion 201
Are pressed against the four electrode patterns 155 (see FIG. 2), and in this state, the space between each electrode pattern 155 and the clip portion 201 is fixed by the solder 17 (see FIG. 1B).

In the case of the present invention, since the clip portion 201 of the metal terminal 20 is fixed with the solder 17 after holding the magnetic sensor element 15, the connection strength between the magnetic sensor element 15 and the metal terminal 20 is sufficient. Therefore, it is not necessary to apply another reinforcing agent on the solder 17. Needless to say, a reinforcing agent may be applied.

The magnetic sensor 10 has a metal terminal 20.
By simply placing the clip portion 201 and the fixed end portion 203 on the fixed plate, the magnetic sensor element 15 is held in a vertically independent state, so that the holder 117b shown in the conventional example becomes unnecessary, and the magnetic sensor element 15 and the metal terminal The magnetic sensor 10 can be constituted only by 20.

Next, FIG. 3 is a perspective view of an essential part showing an upper surface of a fixing plate 30 to which the magnetic sensor 10 is attached. As shown in the figure, on the fixed plate 30 are provided four lands 33 for soldering the fixed ends 203 of the four metal terminals 20 of the magnetic sensor 10 respectively.
The circuit patterns 3 are connected to the circuit patterns 31 respectively. A land 35 for soldering the two fixing portions 211 of the magnetic sensor 10 is also provided on the fixing plate 30. Then, solder is printed on each of the lands 33 and 35.

FIGS. 4 and 5 are views showing a state where the magnetic sensor 10 is mounted on the fixing plate 30, FIG. 4 is a plan view thereof, and FIG.

To mount the magnetic sensor 10 on the fixed plate 30, the magnetic sensor 10 is first mounted on the fixed plate 30,
At this time, each fixed end 203 of the metal terminal 20 is placed on each land 33.

Then, heat is applied only to the land portion 33 to melt the solder 40 (see FIG. 5) printed thereon, thereby fixing the fixed end portion 203 to the land portion 33.

At this time, the magnetic sensor element 15 is connected to the DC motor 5 mounted on the fixed plate 30 as shown by a dotted line in FIG.
It is arranged close to the outer peripheral surface of the magnet 53 attached to the outer periphery of the rotating plate 51 so that its surface is parallel.

Next, the position adjusting portions 209 of the two position adjusting plates 207 provided on the magnetic sensor 10 are pressed with the same force by a jig (not shown) to adjust the distance between the magnetic sensor element 15 and the magnet 53.

In the present invention, the position adjustment plates 207 are provided on both sides of the magnetic sensor element 15, and these two position adjustment plates 20 are provided.
7 is pressed with the same force to adjust the position of the magnetic sensor element 15, so that the surface of the magnetic sensor element 15 can be accurately translated, so that the adjustment of the separation distance from the magnet 53 can be adjusted with respect to the surface of the magnet 53. Can be done exactly parallel.

During this adjustment, the output of the metal terminal 20 is monitored by a device (not shown),
5 is the position where the optimum output is obtained (the separation distance is shown in FIG. 5).
(Position L shown in FIG. 5), heat is applied only to the land 35 to melt the solder 41 printed on the land 35 as shown in FIG. In this embodiment, the distance L is 100
It is about μm.

As a result, the magnetic sensor 1 on the fixed plate 30
The fixing of 0 is completed.

FIG. 6 is a schematic perspective view showing a magnetic sensor 10-2 according to a second embodiment of the present invention.

Also in this magnetic sensor 10-2, a clip portion 201-2 provided at one end of four metal terminals 20-2 is attached to the lower side of the flat magnetic sensor element 15-2. .

This embodiment is different from the first embodiment only in the shape of the position adjusting plate 207-2.

That is, the position adjusting plate 20 according to this embodiment
7-2 is a position adjustment unit 20 that protrudes from the clip unit 201-2 and has a surface parallel to the surface of the magnetic sensor element 15-2.
9-2, a connecting portion 213-2 formed by bending the position adjusting portion 209-2 at a right angle toward the rear side, and a connecting portion 213.
-2 fixed part 211 formed by further bending the lower end of right angle
-2.

The point where the position of the surface of the fixing portion 211-2 coincides with the lowest position of the clip portion 201-2 is as follows.
This is the same as the first embodiment.

If the position adjusting plate 207-2 is formed in such a shape, its mechanical strength is increased, which is more preferable.

FIG. 9 is a schematic perspective view showing a magnetic sensor 10-3 according to a third embodiment of the present invention.

The magnetic sensor 10-3 differs from the second embodiment in the shape of the position adjusting plate 207-3.

That is, the position adjusting plate 20 according to this embodiment
7-3 includes a position adjustment unit 209-3, a connection unit 213-3, and a fixing unit 211-3, like the magnetic sensor 10-2 shown in FIG. 211
-3 is bent outward.

The one fixing part 211-3 is provided with an oblong through hole 217-3, and the other fixing part 211-3 is provided.
Is provided with a support claw 215-3 so as to protrude downward by notching the fixing portion 211-3.

The fixed plate 3 of the magnetic sensor 10-3
For mounting on the support plate 0-3, the support claw 215-3 is rotatably inserted into a circular hole 37-3 provided in the fixing plate 30-3,
By rotating the support claw 215-3 as a center, the position of the magnetic sensor element 10-3 is finely adjusted, and after determining the optimum position, the screw 60-3 is passed through the through hole 217-3. It is screwed into the screw hole 39-3 provided in the fixed plate 30-3,
This is done by fixing.

In the case of this embodiment, the magnetic sensor element 15
Although the parallel movement of -3 cannot be performed, the number of parts is smaller than that of the conventional example shown in FIG.

Although the embodiments of the present invention have been described above, the present invention is not limited to these, and the following modifications are possible, for example. The fixing of the fixing portion of the position adjusting plate to the fixing plate does not necessarily have to be performed by soldering, but may be performed by using, for example, an instant adhesive. In this case, the land portion of the fixing plate is unnecessary.

The position of the fixed portion of the position adjusting plate and the position of the fixed end of the rear end of the metal terminal do not necessarily have to coincide with the lowest position of the clip portion, and can be changed as necessary.

If the position of the fixing portion of the position adjusting plate is positioned further below the lowest position of the clip portion,
The magnetic sensor element can be installed at a position higher than the fixed plate by a predetermined height.

It goes without saying that the shapes of the magnetic sensor element and the metal terminal plate can be variously modified.

[0054]

As described in detail above, the present invention has the following excellent effects. The magnetic sensor can be composed of two types of parts, the magnetic sensor element and the metal terminal, and the manufacturing cost can be reduced.

The magnetic sensor element can be held independently on the fixing plate without using any special member.

The magnetic sensor element can be accurately translated. Accordingly, the magnetic sensor element can be translated very accurately with respect to the object to be detected, and fine adjustment of the interval between the two can be easily and accurately performed. The moving operation is also easy.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, wherein FIG. 1 (a) is a schematic perspective view and FIG. 1 (b) is a side view.

FIG. 2 is a perspective view showing a magnetic sensor element 15;

FIG. 3 is a perspective view of a main part showing an upper surface of a fixing plate 30 to which the magnetic sensor 10 is attached.

FIG. 4 is a plan view showing a state where the magnetic sensor 10 is attached to a fixed plate 30.

FIG. 5 is a main part side view showing a state where the magnetic sensor 10 is attached to a fixing plate 30.

FIG. 6 is a magnetic sensor 10 according to a second embodiment of the present invention.
FIG. 2 is a schematic perspective view showing -2.

7A is a plan view showing an example of use of a conventional magnetic sensor, and FIG. 7B is a cross-sectional view taken along a line aa in FIG. 7A.

FIG. 8 is a side view showing a magnetic sensor 80 previously proposed by the present applicant.

FIG. 9 is a magnetic sensor 10 according to a third embodiment of the present invention.
It is a schematic perspective view which shows -3.

[Explanation of symbols]

 10, 10-2 Magnetic sensor 15, 15-2 Magnetic sensor element 151 Substrate 153 Magnetic resistance pattern 155 Electrode pattern 20, 20-2 Metal terminal 201, 201-2 Clip portion 207, 207-2 Position adjusting plate 209, 209- 2 Position adjustment unit 211, 211-2 Fixed unit

Claims (2)

[Claims] 1. A magnetic sensor element having a magnetoresistive pattern and a plurality of electrode patterns drawn from the magnetoresistive pattern provided on a surface of a flat substrate, and an elastic metal plate provided at one end of the magnetic sensor element. A plurality of metal terminals provided with a clip portion having a shape for holding a lower end side, wherein the clip portion of each metal terminal sandwiches a lower side of the magnetic sensor element at predetermined intervals and at the same time, the plurality of clip portions are formed. The metal terminals at both ends of the plurality of metal terminals are provided with position adjustment plates protruding outward from both sides of the metal terminals. Magnetic sensor. 2. The position adjusting plate includes a position adjusting portion having a surface substantially parallel to a substrate surface of the magnetic sensor element, and a fixing portion formed by bending a lower end side of the position adjusting portion at a substantially right angle. The magnetic sensor according to claim 1, wherein: