JPS59732Y2 - rotary variable resistor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotary variable resistor, and an object of the present invention is to provide a variable resistor with a grounding structure suitable for cases where the panel on which the variable resistor is mounted is an insulating material. shall be.

Conventionally, rotary variable resistors have been used for safety reasons, improving electrical reliability, etc., so the metal bearing of the variable resistor is electrically connected to a metal panel on the front of the set, and electrical continuity is established with the bearing. A metal cover, etc., was grounded to the panel.

However, recently, the front panel of sets is often made of insulating synthetic resin, and in this case, for example, the first
．． Two insulating substrates 20.2 facing each other as shown in the second diagram.
1 is attached to a cylindrical metal cover 22 by the mounting feet 22 a of the cover 22, and a grounding terminal 23 is attached to the back surface of the insulating board 21 on the rear stage side. Similarly, the terminal 23 is connected and fixed to the cover 22 by the mounting foot 22a, and the terminal 23 is grounded at a predetermined location.

In addition, here, 24 is a shaft that drives the slider holder in the cover 22, 25 is a metal bearing, and the mounting foot 22 a
It is attached in close contact with the insulating substrate 20 on the front stage side.

25 a is the threaded part of the bearing, 25 is also the boss part, 25
Similarly, C is a part of the stopper, and 25d is a flat plate part.

Further, 26... are terminals for external connection connected and fixed to the resistors and current collectors of the two edge substrates 20 and 21.

However, in the above configuration, the normal terminal 26...
. . . In addition, a special shaped earth terminal 23 is required separately, and the work of attaching the flat plate part 23 a of the earth terminal 23 with the mounting foot 22 a of the cover 22 is relatively complicated. Ta.

After all, it is easy to automate the press-fitting and tightening process for the normal terminal 26, but for the ground terminal 2
3 at a predetermined location, and attach the mounting feet 22 of the cover 22.
The work of bending a requires skilled manual labor.

The present invention was developed in view of the above points, and is intended to improve assembly workability by connecting the cover to a conductive pattern for grounding on an insulating substrate and connecting a terminal to the conductive pattern. be.

Hereinafter, an example in which the present invention is applied to a double opposed variable resistor similar to that shown in FIG. 1 is shown in FIG. 3 and will be described in detail.

In the figure, reference numeral 1 denotes an insulating substrate, which has a shaft hole 1a in the center for inserting a shaft (not shown).

2 is a current collector printed and formed with conductive paste around the shaft hole 1a, 2a is a lead part of the current collector 2, and 3 is a resistor printed and formed around the current collector 2 with a resistance paste. , 3a are lead portions of the resistor 3.

4 is a conductive pattern for grounding printed and formed with conductive paste, the end of which is connected to each of the lead parts 2a and 3a.
, 3a extend in the same direction.

5... and 6 are terminals for external connection of the same shape cut out of metal pieces, and holes 7... formed in the respective lead parts 2a, 3a, 3a and the ends of the conductive pattern 4.
The eyelet part is press-fitted and tightened, and the terminal 6 is used as a grounding terminal.

Reference numeral 8 denotes a cylindrical metal cover similar to that shown in FIG. 1, and mounting legs 8a are integrally formed on the top and bottom.

8b is a connecting portion of the cover 8.

lb and lb are holes drilled in the conductive pattern 4 of the insulating substrate 1, through which the mounting legs 8a and 8a are inserted.

lc and lc are notches provided on the sides of the insulating substrate 8, into which the mounting legs 8a and 8a are similarly inserted.

Although FIG. 3 only shows one board,
Hole 1b and notch 1 of insulating substrates 1, 1 having vertically symmetrical shapes
After inserting the mounting feet 8a of the cover 8 into C and bending them, the cover 8 and the board 1 will be integrated, and the end surface of the cover 8 will come into pressure contact with the conductive pattern 4, and the cover will be closed. 8 and the grounding terminal 6 are electrically connected.

At this time, although not shown, the metal bearing is also attached to the board 1 by the mounting foot 8a of the cover 8, as before, and the bearing that is electrically connected to the cover 8 is also electrically connected to the ground terminal 6. .

As shown above, according to the present invention, the cover is pressure-contacted to the grounding conductive pattern on the insulating substrate for electrical continuity, and the terminals of the conductive pattern are connected to the resistor and the current collector. Since it is installed in parallel with the conventional terminal, there is no need for a specially shaped earth terminal, and the earth terminal can be attached to the insulating board in the same way as other terminals, making it easy to automatically assemble the terminal. In addition, just by attaching the mounting feet to the board, it is possible to establish continuity between the cover and the conductive pattern for grounding, making the overall assembly extremely easy and the structure simple. Suitable as a ground structure.

[Brief explanation of the drawing]

1 and 2 relate to a conventional example, FIG. 1 is a side view of a rotary variable resistor, FIG. 2 is a perspective view showing a grounding terminal, and FIG. 3 is an embodiment of the present invention. FIG. 2 is a perspective view of a main part of such a rotary variable resistor. 1... Insulating substrate, 1b... Hole, 1C.
... Notch, 2 ... Current collector, 3 ...
...Resistor, 4... Conductive pattern for grounding,
5... terminal, 6... ground terminal,
8...Cover, 8a...Mounting foot.

Claims (1)

[Scope of utility model registration request] A hole is made in the insulating substrate on which the resistor and the current collector are formed, through which the mounting foot of the cylindrical metal cover is inserted, and a grounding terminal made of a metal piece is inserted between the resistor and the current collector. The mounting foot is arranged in parallel with each terminal made of a metal piece connected and fixed to the body, is formed by extending a conductive pattern for grounding connected to the grounding terminal to the edge of the hole, and is inserted into the hole of the insulating substrate. 1. A rotary variable resistor characterized in that the cover is fixed to an insulating substrate by bending, and the end face of the cover is pressed into contact with the grounding conductive pattern.