JPH09266108A - Variable resistor - Google Patents

Abstract

(57) Abstract: It is an object of the present invention to improve flux resistance in a variable resistor used for general electronic equipment. SOLUTION: A middle terminal 6 in which a eyelet portion 7 is integrally formed in a through hole 3 of a substrate 1 and the eyelet portion 7 is closed is engaged and connected to the eyelet portion 7 of the middle terminal 6, And a slider 8 that slides rotatably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable resistor used in various electronic devices.

[0002]

2. Description of the Related Art A conventional variable resistor is disclosed in Japanese Utility Model Application No. 1-100.
No. 28 (Actual Kaihei No. 2-101504) consisting of a substrate having a through hole and a rotor having a hollow shaft rotatably supported with respect to the substrate. The hollow shaft of the rotor is used as a substrate. While inserting into the provided through hole,
It is disclosed that a rotor member is rotatably mounted by caulking at the tip of a hollow shaft.

[0003]

SUMMARY OF THE INVENTION In the above conventional configuration,
When mounting on a mounting board, there was a problem that the resistance value fluctuates when flux penetrates from the lower surface of the board and reaches the resistor.

The present invention solves the above problems and provides a variable resistor in which flux does not penetrate from the lower surface of a substrate.

[0005]

In order to achieve the above object, the present invention provides a substrate having a through hole having a step portion and an intermediate terminal having an eyelet portion for closing the through hole at the step portion of the substrate. And a slider having a protrusion that fits into the eyelet portion of the middle terminal at the stepped portion of the substrate.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
A substrate having a through hole having a step portion at the center and a resistor on the upper surface, and an eyelet portion for closing the through hole at the step portion of the substrate and having one end protruding outside the substrate And a projecting portion that fits into the eyelet portion of the middle terminal at the stepped portion of the board and has a brush that slides on the resistor at one end and a driver groove that is parallel to the board at the other end. And a slider provided with.

A variable resistor according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a variable resistor according to an embodiment of the present invention, FIG. 2 is a perspective view of a substrate which is the main part, and FIG. 3 is a perspective view of a slider which is the main part. .

In the figure, 1 is a horseshoe-type resistor 2 on the upper surface.
Is a substrate having. This substrate 1 has a through hole 3 in the center.
And a step portion 4 inside the through hole 3. Reference numeral 5 denotes an external terminal that is electrically connected to the resistor 2 and that is provided so as to project from the inside of the substrate 1 to the outside. Reference numeral 6 denotes a middle terminal which has an eyelet portion 7 which is provided in the step portion 4 of the substrate 1 so as to close the through hole 3 and has one end which has an outer terminal 6a protruding from the inside of the substrate 1 to the outside. Reference numeral 8 denotes a stepped portion 4 of the substrate 1 in which the eyelet portion 7 of the middle terminal 6 is housed in the slider through hole 9 and fitted therein.
A slider having 0. The slider 8 is composed of one plate, has a brush 11 that slides on the resistor 2 of the substrate 1 at one end, and has a driver groove 13 that is connected to the other end by a connecting portion 12 and is parallel to the substrate 1. It is a thing.

With the above configuration, the eyelet portion 7 of the middle terminal 6
Since the protrusion 10 of the slider 8 is fitted in, the flux entering from the lower surface side of the substrate 1 is contained in the eyelet portion 7 of the middle terminal 6 and does not enter the resistor 2.

Incidentally, as shown in FIG. 4, a sealing plate 14 may be provided on the lower surface of the middle terminal 6 so as to close the through hole 3 of the substrate 1.

Further, as shown in FIG. 5, a middle terminal 21 may be formed by integrating the middle terminal and the sealing plate.

[0013]

As described above, the present invention provides a variable resistor having improved reliability because flux penetration can be prevented by the middle terminal.

[Brief description of drawings]

FIG. 1 is a sectional view of a variable resistor according to an embodiment of the present invention.

FIG. 2 is a perspective view of a substrate, which is the main part of the same.

FIG. 3 is a perspective view of a slider, which is the main part of the same.

FIG. 4 is a sectional view of a variable resistor in another example.

FIG. 5 is a sectional view of a variable resistor according to another example.

[Explanation of symbols]

 1 Substrate 2 Resistor 3 Through Hole 4 Step 6 Middle Terminal 7 Eyelet 8 Slider 10 Projection 11 Brush 13 Driver Groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Mitsumura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A substrate having a through hole having a resistor on its upper surface and having a stepped portion in the center, and an eyelet portion for closing the through hole at the stepped portion of the substrate and having one end outside the substrate. A middle terminal provided so as to project,
A slider having a step portion of the board, which has a protrusion that fits into the eyelet portion of the middle terminal, has a brush that slides on the resistor at one end, and has a driver groove that is parallel to the board at the other end. A variable resistor consisting of and.