JPS61123106A - Variable resistor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a variable resistor.

Conventional configurations and their problems In recent years, variable resistors have been required to have improved characteristics, be smaller in size, lower in cost, etc., and efforts have been made to make them more complex.

The conventional variable resistor as described above will be described below with reference to the drawings.

FIG. 1 is a side sectional view of a conventional variable resistor.

FIG. 2 is a sectional view of a conventional variable resistor in which a slider and a knob are integrally molded. FIG. 3 is a top view of a substrate constituting the same conventional variable resistor.

In FIGS. 1 to 3, reference numeral 1 denotes a slider having spring properties, and contact points 1a and 1b are provided, respectively. Reference numeral 2 denotes a knob which is integrally formed with the slider 1. Reference numeral 4 denotes a substrate made of an insulating material, with a through hole 4a provided in the center, and a circular central electrode 5 connected to a terminal 7a around the through hole 4a.
is formed.

Terminals 7b are provided around the central electrode 6 at both ends.

Horseshoe-shaped resistor films 6 are formed, each connected to 7C. As shown in FIG. 2, the shaft portion 2b of the slider 1 and knob 2 integrally molded is inserted into the through hole 4a of the substrate 4, and is rotatably attached to the substrate 4 with a coin. ing.

Here, the contact 1a of the slider 1 is connected to the resistor film e.
The contact 1b is configured to slide on the center electrode 6, and a desired resistance value can be obtained by operating the knob 2.

However, the above configuration has a drawback in that it is difficult to sufficiently protect the center electrode 6, the resistor film 6, and the sliding portion of the slider 1 from dust by using the knob 2.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a variable resistor equipped with a dust-proof slider and knob ε integrally molded.

Structure of the Invention To achieve this object, the variable resistor of the present invention includes a slider and an intermediate member integrally molded with a knob, and an upstanding wall provided on the slider side of the outer periphery of the knob. This configuration allows the variable resistor to have a dustproof effect.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 4 is a side sectional view of a variable resistor in an embodiment of the present invention. FIG. 5 is a cross-sectional view of a variable resistor according to an embodiment of the present invention, in which the slider and intermediate material are integrally molded with a knob. In FIG. 5, an upstanding wall 2'a is provided on the outer periphery of the knob 2', which is integrally formed with the slider 1 and the intermediate member 3, on the slider 1 side. 2'b is a shaft portion. Fourth
In the figure, 4 is a substrate, and 7a, 7b, and 7c are terminals, and the structure is the same as in FIGS. 1 and 2 above.

The structure configured as above will be explained.

The reason for providing the intermediate material 3 is that when the knob 2' is integrally molded with the slider 1, the upright wall 2'a can be provided on the slider 1 side of the outer periphery of the knob 2'. This is because it is no longer difficult.

This will be further explained using examples of mold structure shown in FIGS. 6 and 7.

FIG. 6 is a sectional view of a main part of an example of the structure of a molding die that forms an upstanding wall without having an intermediate member 3. In FIG. FIG. 7 is a sectional view of a main part of a structural example of a molding die having an intermediate material 3 and forming an upright wall.

In FIGS. 6 and 7, 1 is a slider, 3 is an intermediate material, 8.8' is a stationary template, 8a and 8'a are cavities of the stationary template, and sb , 8c and s'b are the cores of the stationary template. 9.9' is the movable side template, 9a
, 9'a is the cavity of the movable side template, 9b, 9
C.

9'b and 9'C are the cores of the movable template. 10
is a slide core. Comparing the mold structure examples shown in FIG. 6 and FIG. 7, which form an upright wall during molding without bending, etc., the mold structure shown in FIG. 7 is simpler;
Furthermore, since the molded part does not have a through hole formed by a core or the like in the upstanding wall provided on the slider 1 side of the upper part of the knob and the outer periphery of the knob, the dustproof effect is much better.

As described above, according to this embodiment, the slider 1 and the intermediate material 3 are integrally molded with the knob 2', and the knob 2'
By providing the upright wall 2'a on the slider 1 side of the outer periphery of ', the central electrode S, the resistor film 6, and the sliding portion of the slider 1 are dust-proofed. It can be a structure.

In the embodiment of the present invention, the intermediate member 3 is a flat plate, but it may also be shaped by drawing or the like.

Effects of the Invention As described above, the present invention has a simple structure by integrally molding a slider and an intermediate member with a knob, and providing an upright wall on the slider side of the outer periphery of the knob. It is possible to provide a variable resistor with a dust-proof effect, and the mold structure can be made simpler and integrated, resulting in a reduction in the number of parts during assembly, which has great practical effects.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of an embodiment of a conventional variable resistor;
The figure is a sectional view of a conventional variable resistor in which the slider and knob are integrally molded, FIG. 3 is a top view of the board, and FIG. 4 is a side sectional view of a variable resistor in an embodiment of the present invention. , 5th
The figure shows Example 1 of the present invention...Slider, 1a, 1b
...Contact, 2, 2'...Knob, 2'a
...... Standing wall of knob 2', 2b. 2'b...Shaft part, 3...Intermediate material, 4.
... Board, 4a ... Through hole of board 4, 5
...Intermediate electrode, 6...Resistor film, 7
a, 7 b, 7 c----terminal, 8,8
'...Fixed side template, 8a, 8'a...
Fixed side template cavity, sb, 8c, 8'b...
... Core of fixed side template, 9.9'... Movable side template, 9a, 9'a... Cavity of movable side template,
9 b, 9 c, 9'b, 9'c...
・Core of movable side template, 1o...Slide core. Name of agent: Patent attorney Toshio Nakao and 1 other famous confectionery 1
Figure 21 Figure 3 L::Iα Figure 6 Figure 7 Figure 8d l Bar 3

Claims (1)

[Claims] A variable resistor comprising: a slider and an intermediate material integrally molded with a knob, and an upright wall provided on the slider side of the outer periphery of the knob.