JPH09260116A - Variable resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the height of a variable resistor by forming a step difference part to caulk a driver plate to an inner terminal. SOLUTION: A regular parallelepiped base 21 has a step difference part 22 recessed down from the upper face at the center and ceramic or other insulation material having a circular hole 23 in this step. A horseshoe-like resistor element 24 is provided on the upper face of the base 21 and terminals are provided at the side face of the base 21 so as to electrically connect it to the element 24. A driver plate 27 has a protrusion 28 extending to the step difference part 22 and through-hole having nearly the same shape as the hole 23 of the base 21 and slider 30 one end of which is electrically connected to the element 24 and the other of which has a parallel notch 32 coupled a coupler 31, to the base 21. A metal-made inner terminal 33 is a third terminal which is disposed along the side face from the lower face of the base 21 and has a nearly circular columnar tube 34 extending to the upper face from the lower face.

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 Jpn.
The one disclosed in the microfilm of 6736 (Jitsukai Sho 61-114805) is known.

A conventional variable resistor will be described below with reference to the drawings. FIG. 5 is a sectional view of a conventional variable resistor, and FIG. 6 is a top view thereof.

In the figure, reference numeral 1 is a substrate made of an insulating material such as ceramics and having a hollow hole 2 formed substantially in the center thereof. A resistor 3 having a substantially arc shape is formed on the upper surface of the substrate 1 by printing, and both ends of the resistor 3 are electrically connected to the terminal portions 4 and 5, respectively. Reference numeral 6 denotes a protrusion having a through hole (not shown) protruding toward the substrate 1, one end has a slider 8 for sliding the resistor 3 of the substrate 1, and the other end is connected by a connecting portion 9. Cutout 1 parallel to substrate 1
0 is a driver plate. Reference numeral 11 denotes a middle terminal which has a cylindrical portion 12 fitted in the hollow hole 2 of the substrate 1 and which is inserted through a through hole of the driver plate 6 to rotatably support the driver plate 6 on the substrate 1. The middle terminal 11 has one end arranged on the lower end of the substrate 1 and the other end arranged on the side surface of the lower surface of the substrate 1.

[0005]

However, in the above-mentioned conventional configuration, the driver plate 6 and the middle terminal 11 are caulked on the upper surface of the substrate 1 and there is a problem that the height of the variable resistor becomes high. It was

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a variable resistor having a reduced height.

[0007]

In order to achieve the above object, the present invention provides a substrate with a step portion for caulking a driver plate and a middle terminal.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises a substrate having a step portion, a hollow hole in the step portion, and a resistor provided on the upper surface, and the step portion of the substrate. A driver plate having a protrusion having a through hole projecting toward it and having a slider for sliding a resistor on the upper surface of the substrate and having a notch parallel to the substrate;
From a middle terminal that is inserted from the lower surface of the substrate into the hollow hole of the substrate and into which the driver plate is fitted, and a terminal that is electrically connected to the resistor at least on the upper surface of the substrate and protrudes to the outside of the substrate. It will be.

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

FIG. 1 is an exploded perspective view of a variable resistor according to an embodiment of the present invention, and FIG. 2 is a sectional view of the same.

In the figure, reference numeral 21 denotes a rectangular parallelepiped substrate made of an insulating material such as ceramic, which has a step portion 22 dented from the upper surface to the lower surface in the center and a circular hollow hole 23 in the step portion 22. Is. A horseshoe-shaped resistor 24 is provided on the upper surface of the substrate 21. Two
Reference numerals 5 and 26 are first and second terminals provided on the side surface of the substrate 21 so as to be electrically connected to the respective resistors 24. Reference numeral 27 denotes a protruding portion 28 protruding from the step portion 22 of the substrate 21.
And a through hole 29 having substantially the same shape as the hollow hole 23 of the substrate 21, one end having a slider 30 electrically connected to the resistor 24, and the other end connected by a connecting portion 31. The driver plate is provided with a cutout 32 that is parallel to the substrate 21. Reference numeral 33 is a metal middle terminal having a substantially cylindrical cylindrical portion 34 protruding from the lower surface to the upper surface and having a third terminal provided along the side surface from the lower surface of the substrate 21. The cylindrical portion 34 of the middle terminal 33 is crimped by inserting the hollow hole 23 of the substrate 21 and the through hole 29 of the driver plate 27 into the stepped portion 22 of the substrate 21 so that the protruding portion 28 of the driver plate 27 is accommodated. . On this occasion,
The slider 30 of the driver plate 28 is electrically connected. Reference numeral 35 is a sealing material that seals the cylindrical portion 34 of the middle terminal 33.

Note that, as shown in FIG. 3, the driver plate may be provided as a single plate without the connecting portion.

Further, as shown in FIG. 4, the driver plate has a plate-shaped portion at the center, and a driver plate portion having a bottomed groove into which the tip of the driver is inserted so as to straddle the recess of the plate-shaped portion. The slider may be formed by folding back 180 degrees in a state of being connected to the substantially ring-shaped arm portion and projecting the dish-shaped portion of the driver plate portion from the arm portion.

[0014]

As described above, the present invention can provide a variable resistor having a reduced height.

[Brief description of drawings]

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

FIG. 2 is a sectional view of the same.

FIG. 3 is a sectional view of a variable resistor according to another embodiment of the present invention.

FIG. 4 is a sectional view of a variable resistor according to another embodiment of the present invention.

FIG. 5 is a sectional view of a conventional variable resistor.

FIG. 6 is a top view of the same.

[Explanation of Codes] 21 Substrate 22 Stepped portion 23 Hollow hole 24 Resistor 27 Driver plate 29 Through hole 33 Middle terminal 34 Cylindrical portion

Claims (1)

[Claims] 1. A substrate having a step portion, having a hollow hole in the step portion and having a resistor on an upper surface thereof, and a projecting portion having a through hole projecting toward the step portion of the substrate, and A driver plate having a slider for sliding a resistor on the upper surface of the substrate and having a notch parallel to the substrate; and a driver plate inserted from the lower surface of the substrate into a hollow hole of the substrate and fitted with the driver plate. Middle terminal,
A variable resistor comprising a terminal electrically connected to the resistor at least on the upper surface of the substrate and protruding to the outside of the substrate.