JPH1144746A - Magnetic sensor and its fitting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic sensor converting the change of the magnetic field into an electric signal and capable of being fitted in parallel with a magnet and provide its fitting method. SOLUTION: A magnetic resistance element 45 and a connector section 49 connected at the terminal section 50a of the magnetic resistance element 45 are fitted to the case 41 of a magnetic sensor, and the case 41 is provided with fixed sections 44 at opposite side sections perpendicular to the magnetism sensing direction of the magnetic resistance element 45. The magnetic sensor can be fitted in parallel with a magnet, and the magnetic sensor capable of adjusting the gap between a pattern 47 and the magnet more accurately and its using method can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic sensor for detecting a position of a lens of a video camera by converting a change in a magnetic field into an electric signal, and a method for mounting the same.

[0002]

2. Description of the Related Art A conventional magnetic sensor is used together with an object having a magnet for generating a magnetic field to be detected. The position of the object is detected by detecting a magnetic field when the magnet moves linearly. Etc. can be performed.

Hereinafter, a conventional magnetic sensor will be described with reference to the drawings. FIG. 6A is a perspective view of a conventional magnetic sensor, and FIG. 6B is an exploded perspective view of the same.

In FIG. 1, reference numeral 1 denotes a case made of a resin having a plurality of guides 2 and a square hole 3 on an upper surface and a fixing portion 4 on a diagonal side. Reference numeral 5 denotes a magnetoresistive element having a pattern 7 forming a circuit on the upper surface of the substrate 6 and an electrode portion 8 electrically connected to the pattern 7, which is positioned at a predetermined position on the upper surface of the case 1 by the guide 2. And
It is fixed with an adhesive. 9 is one terminal part 10
a is inserted into the square hole 3 of the case 1 so as to be electrically connected to the electrode portion 8 of the magnetoresistive element 5, and the other terminal portion 10 b projects to the opposite side to the case 1 having the magnetoresistive element 5. Is a connector part fixed to the case 1 by a locking part 11 provided in the connector 1.

[0005] A method of mounting the conventional magnetic sensor having the above-described configuration will be described below.

FIG. 7A is a top view showing a conventional method for mounting a magnetic sensor, and FIG. 7B is a side view thereof.

In FIG. 1, reference numeral 21 denotes a magnet in which N poles and S poles are alternately magnetized at a predetermined pitch. Reference numeral 22 denotes a magnetic sensor which is fixed diagonally by screws 26 with the magnet 21 interposed between the mounting portion 25 and the washer 24 with the fixing portion 23 interposed therebetween. Reference numeral 27 denotes a magnetoresistive element provided on the surface of the magnetic sensor 22 facing the magnet 21 with a predetermined gap.
The magnetic sensor 22 incorporated in the magnet 21 as described above detects a change in the magnetic field generated by the linear movement of the magnet 21 in a pattern (not shown) of the magnetoresistive element 27 which is a magnetic sensing part of the magnetic sensor 22. Read at each part, electrode part (not shown)
Through the terminal unit 29 of the connector 28 into an electric signal and output the electric signal.

[0008]

However, in the above-described conventional configuration, the magnetic sensor 22 is attached to the magnet 21 by being fixed diagonally to the attached portion 25 with the screw 26. When the magnetic sensor 22 is tightened, it is difficult to mount the magnetic sensor 22 in parallel to the magnet 21, and it may be inclined obliquely. The pattern of the magnetoresistive element 27 fixed on the upper surface of the magnetic sensor 22 There was a problem that it was difficult to make a gap.

FIG. 8 shows the waveform of the output of the magnetic sensor 22 when it is not assembled parallel to the magnet 21.

FIG. 8A is a diagram showing the relationship between the amount of movement of the magnet and the output when a conventional magnetic sensor is used.
(B) is a figure which shows the relationship between the movement amount of the same magnet, and the resultant force of output.

In the figure, reference numerals 31, 32 and 33 denote patterns 7a, 7a of the pattern 7 of the magnetoresistive element 5 in FIG.
The magnetic sensing and output are performed at the respective portions 7b and 7c. Each of the outputs 31, 32, and 33 is a uniform pattern formed on the magnetoresistive element 27, but each waveform has a different amplitude instead of a constant magnitude, and the sawtooth waveform indicating the resultant force also has a different slope. And the output varied.

The present invention solves the above-mentioned conventional problems. It is easy to mount a magnetic sensor in parallel with a magnet, and a pattern of a magnetoresistive element mounted on an upper surface of the magnetic sensor and a magnet are provided. It is an object of the present invention to provide a magnetic sensor and a method of mounting the same, which can more accurately adjust the gap of the magnetic sensor.

[0013]

In order to achieve the above object, the present invention provides a magnetic sensor case wherein a fixed portion is provided on an opposite side perpendicular to a magnetic sensing direction of a magnetic resistance element. It is.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION
In a magnetic sensor comprising a magnetoresistive element and a case provided with a terminal portion to which the magnetoresistive element is mounted and which is electrically connected to the magnetoresistive element, the case includes a magneto-sensitive element which senses the magnetoresistive element. A fixing portion is provided on a side portion opposite to the direction perpendicular to the direction.

The invention described in claim 2 is the first invention.
One of the described fixing portions is a screw mounting portion that can be fixed by a screw, and the other is a protrusion that fixes the case.

According to a third aspect of the present invention, there is provided a terminal for mounting a magneto-resistive element and electrically connecting to the magneto-resistive element, the terminal being perpendicular to the magneto-sensitive direction of the magneto-resistive element. A magnetic sensor comprising a case having a fixed portion on the opposite side, and a magnetic sensor attached to a fixed member at the fixed portion of the magnetic sensor, wherein the fixed portion of the magnetic sensor and the fixed member The gap is adjusted by providing and fixing a leaf spring therebetween.

According to a fourth aspect of the present invention, there is provided a terminal for mounting a magneto-resistive element and electrically connecting to the magneto-resistive element, the terminal being perpendicular to a magnetic sensing direction of the magneto-resistive element. In a magnetic sensor mounting method for fixing a magnetic sensor having a case having a screw mounting portion on one side and a projection on the other side to a fixing member at a fixing portion of the magnetic sensor, the fixing portion of the magnetic sensor and the fixing member The gap is adjusted by providing and fixing a leaf spring therebetween.

According to the above-mentioned claim, since the fixing portion is located opposite to the side portion perpendicular to the magnetic sensing direction of the magnetoresistive element, the magnetic sensor is assembled into the case and the screw is mounted. When tightening, the magnet and the pattern of the magnetoresistive element provided on the upper surface of the magnetic sensor are parallel to each other, so that a predetermined gap can be easily provided.

Embodiment 1 Hereinafter, a magnetic sensor according to Embodiment 1 of the present invention will be described with reference to the drawings.

FIG. 1A is a perspective view of a magnetic sensor according to Embodiment 1 of the present invention, and FIG. 1B is an exploded perspective view of the same.

In the figure, reference numeral 41 denotes a plurality of guides 4 on the upper surface.
2 and a square hole 3 so that the fixing portion 44 is opposed to the side portion.
This is a case made of a resin having 45 is a pattern 47 forming a circuit on the upper surface of the substrate 46 and the pattern 47
And a magnetic resistance element having an electrode portion 48 electrically connected to the case 41. The magnetoresistive element is positioned at a predetermined position on the upper surface of the case 41 by the guide 42, and is fixed with an adhesive. 49 is inserted into the square hole 43 of the case 41 so that one terminal portion 50a is electrically connected to the electrode portion 48 of the magnetoresistive element 45, and the other terminal portion 50b is formed on a surface opposite to the magnetoresistive element 45. It is a connector part that protrudes and is fixed to the case 41 by the locking part 51.

The operation and mounting method of the magnetic sensor according to Embodiment 1 of the present invention configured as described above will be described below.

FIG. 2A is a top view showing a method of mounting the magnetic sensor according to the first embodiment of the present invention, and FIG. 2B is a side view thereof.

In the drawing, reference numeral 61 denotes a magnet in which N poles and S poles are alternately magnetized at a predetermined pitch. Reference numeral 62 denotes a magnetic sensor which is fixed to a mounting portion 65 with a screw 66 with a leaf spring 64 interposed between the fixing portion 63. Reference numeral 67 denotes a magnetoresistive element provided on a surface of the magnetic sensor 62 facing the magnet 61 with a predetermined gap from the magnet 61. Thus, the magnet 6
The magnetic sensor 62 incorporated in the magnetic sensor 1 reads a change in a magnetic field caused by the linear movement of the magnet 61 in each part of a pattern (not shown) of a magnetoresistive element 67 which is a magnetic sensing part of the magnetic sensor 62. Connector 6 via an electrode (not shown)
The signal is converted into an electric signal from the terminal 69 of FIG. Since the fixing portion 63 is located opposite to the side portion perpendicular to the magnetic sensing direction of the magnetoresistive element 67, when the magnetic sensor 62 is assembled into the attached portion 65 and the screw is tightened, The magnetic sensor 62 is not attached obliquely to the magnet, and the magnet 61 and each part of the pattern of the magnetoresistive element 67 provided on the upper surface of the magnetic sensor 62 become parallel, and a constant output is obtained. is there.

Further, this magnetic sensor 62 is
When the leaf spring 64 is inserted into the
Can easily adjust the gap provided between the magnet 61 and the magneto-resistive element 67 by only tightening the screw, so that the gap can be finely adjusted according to the position where the output of the electric signal is maximized. It is.

FIG. 3 shows the waveform of the output of the magnetic sensor 62 incorporated in parallel with the magnet 61.

FIG. 3A is a diagram showing the relationship between the amount of movement of the magnet and the output when the magnetic sensor according to Embodiment 1 of the present invention is used, and FIG. 3B is the amount of movement and the output of the magnet. It is a figure which shows the relationship with the resultant force.

In the figure, reference numerals 71, 72 and 73 denote 47 of the pattern 47 of the magnetoresistive element 45 in FIG.
a, 47b, and 47c are magneto-sensitive and output. Each of the outputs 71, 72, and 73 has a constant waveform, a constant amplitude, and a sawtooth waveform indicating the resultant force has a constant slope. As described above, since the magnet and each part of the pattern are parallel and have the same gap length in every pattern part, a constant output without variation can be obtained.

Embodiment 2 Hereinafter, a magnetic sensor according to Embodiment 2 of the present invention will be described with reference to the drawings.

FIG. 4 is a perspective view of a magnetic sensor according to the second embodiment of the present invention. In the figure, reference numeral 81 denotes a case made of a resin having a plurality of guides 82 on an upper surface, a screw mounting portion 83 on one side, and a projection 84 on the other side. 85 is a pattern 8 constituting a circuit on the upper surface of the substrate 86
7 and an electrode portion 88 electrically connected to the pattern 87
And is positioned at a predetermined position on the upper surface of the case 81 by the guide 82 and fixed with an adhesive. Reference numeral 89 denotes a connector part which is inserted and fixed in a square hole (not shown) of the case 81 so that the terminal part 90 is electrically connected to the electrode part 88 of the magnetoresistive element 85.

The operation and mounting method of the magnetic sensor according to the second embodiment of the present invention configured as described above will be described below.

FIG. 5A is a top view showing a method of mounting the magnetic sensor according to the second embodiment of the present invention, and FIG. 5B is a side view thereof.

In the figure, reference numeral 91 denotes a magnet in which N poles and S poles are alternately magnetized at a predetermined pitch. Reference numeral 92 denotes a screw mounting portion 93 which is one side portion, which is fixed to a mounted portion 95 with a screw 96 with a leaf spring 94 interposed therebetween, and a projection 9 which is the other side portion.
7 is a magnetic sensor that is inserted into and fixed to the mounting portion 95. Reference numeral 98 denotes a magnetoresistive element provided on a surface of the magnetic sensor 92 facing the magnet 91 with a predetermined gap from the magnet 91.

The magnetic sensor 92 incorporated in the magnet 91 as described above detects a change in the magnetic field generated by the linear movement of the magnet 91 by using a magnetoresistive element 98 as a magnetic sensing part of the magnetic sensor 92.
Is read by each part of the pattern (not shown), and is converted into an electric signal from the terminal part 100 of the connector part 99 via an electrode part (not shown) and output. Since the screw mounting portion 93 and the projecting portion 97 are located opposite to the side perpendicular to the magnetic sensing direction of the magnetoresistive element 98, the magnetic sensor 92 is incorporated into the mounting portion 95 to remove the screw. When tightening,
The magnetic sensor 92 is not attached obliquely to the magnet, and the magnet 91 and each part of the pattern of the magnetoresistive element 98 provided on the upper surface of the magnetic sensor 92 become parallel, and a constant output is obtained. is there.

In the second embodiment of the present invention, one side of the magnetic sensor 92 is fixed by inserting the protrusion 97 into the mounting portion 95, so that the screw 96 can be tightened only once. The gap can be adjusted in a shorter time.

[0036]

As described above, according to the present invention, since the fixed portion of the magnetic sensor is located opposite to the opposite side perpendicular to the magnetic sensing direction of the magneto-resistive element, Since the sensor can be mounted parallel to the magnet without being inclined, the present invention can provide a magnetic sensor capable of obtaining a stable output and a method of mounting the magnetic sensor.

Further, it is possible to provide a magnetic sensor capable of adjusting the gap between the magnet and the pattern of the magnetoresistive element mounted on the upper surface of the magnetic sensor more easily and accurately, and a method of mounting the same.

[Brief description of the drawings]

FIG. 1A is a perspective view of a magnetic sensor according to a first embodiment of the present invention. FIG.

FIG. 2A is a top view showing the mounting method. FIG. 2B is a side view showing the mounting method.

FIG. 3A is a diagram illustrating a relationship between a moving amount of the magnet and an output; and FIG. 3B is a diagram illustrating a relationship between a moving amount of the magnet and a resultant force of the output.

FIG. 4 is a perspective view of a magnetic sensor according to a second embodiment of the present invention.

5A is a top view showing the mounting method, and FIG. 5B is a side view showing the mounting method.

FIG. 6A is a perspective view of a conventional magnetic sensor. FIG.

FIG. 7A is a top view showing the mounting method. FIG. 7B is a side view showing the mounting method.

8A is a diagram illustrating a relationship between a moving amount of the magnet and an output. FIG. 8B is a diagram illustrating a relationship between a moving amount of the magnet and a resultant force of the output.

[Explanation of symbols]

 41 case 44 fixing part 45 magnetoresistive element

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI G01R 33/02 G01R 33/02 U H01L 43/02 H01L 43/02 Z (72) Inventor Yuji Kitamura 1006 Kazuma, Oaza, Kadoma, Osaka Matsushita Electric Sangyo Co., Ltd.

Claims (4)

[Claims] 1. A magnetic sensor comprising: a magnetoresistive element; and a case provided with a terminal portion on which the magnetoresistive element is mounted and which is electrically connected to the magnetoresistive element.
The magnetic sensor, wherein the case has a fixed portion on an opposing side perpendicular to a magnetic sensing direction of the magnetoresistive element. 2. The magnetic sensor according to claim 1, wherein one of the fixing portions is a screw mounting portion that can be fixed by a screw, and the other is a protrusion that fixes the case. 3. A fixed portion is mounted on a side portion of the magnetoresistive element, the terminal portion being mounted on the magnetoresistive element and being electrically connected to the magnetoresistive element. A magnetic sensor having a case having a magnetic sensor, wherein the magnetic sensor is fixed to a fixing member at a fixing part of the magnetic sensor, wherein a leaf spring is provided and fixed between the fixing part of the magnetic sensor and the fixing member. A magnetic sensor for adjusting a gap between the magnetoresistive element and the magnet. 4. A terminal for mounting a magneto-resistive element and electrically connecting to the magneto-resistive element, and having a screw mounting part on one side perpendicular to the magnetic sensing direction of the magneto-resistive element on the other side. In a magnetic sensor mounting method of fixing a magnetic sensor having a case having a projection to a fixed member at a fixed portion of the magnetic sensor, a leaf spring is provided between the fixed portion of the magnetic sensor and the fixed member and fixed. A magnetic sensor for adjusting a gap between the magnetoresistive element and the magnet.