JPH0532970Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotating electronic component used in electronic equipment including consumer electronic equipment such as video and television receivers.

Prior Art The prior art will be explained using a variable resistor shown in FIG. FIG. 3 is a side sectional view.

In Fig. 3, 1 is an insulating operating shaft;
Reference numeral 2 denotes a bearing for supporting the operating shaft, and reference numeral 3 denotes a metal cover with the bearing 2 attached to the bottom and an opening at the top. 4 is a mounting board that is attached to the opening of the metal cover 3 by bending the mounting legs (not shown) of the metal cover 3; 5 is a resistor that is attached to the mounting board 4; , 6 is a brush that is attached to the operating shaft 1 and comes into sliding contact with the resistor 5, 7 is a contact that comes into sliding contact with the brush 6, and 8 is a terminal led out from the contact.

Problems to be Solved by the Invention As described above, conventional rotating electronic components generally use a bearing 2 attached to a metal cover 3 to prevent shaft rattling that occurs when the operating shaft 1 is operated. However, since the bearing 2 is required, the number of assembly steps and the number of parts increases, making it expensive.

Means for Solving the Problems In order to solve the above problems, the present invention provides the above-mentioned cover, which is formed by integrally molding at least a cover and a cylindrical convex portion that penetrates the bottom surface of the cover and projects to the outside. A rotary electronic component is constituted by a mounting board mounted in the opening and an operating shaft held within the cover, which is provided with a cylindrical hole that fits into the convex part.

Function As described above, the present invention allows the convex part of the mounting board that penetrates the bottom of the cover and protrudes to the outside to fit into the hole of the operation shaft, so there is no need to use a conventional bearing. This can reduce the wobbling of the shaft.

FIG. 1 shows an embodiment of a rotary electronic component according to the present invention.
The variable resistor will be described with reference to Fig. 2. Fig. 1 is a side cross-sectional view, and Fig. 2 is an exploded perspective view. Note that the same parts as those in the conventional example are given the same reference numbers, and the description will be omitted.

9 is an insulating operating shaft with a cylindrical hole 9 in the center.
a, and also has an operating section 9b that is operated by an operator from the outside by hand or the like. Reference numeral 10 denotes a mounting board molded from resin, with a hole 9a for the operating shaft 9 in the center.
A cylindrical convex portion 10a that fits into the metal cover 3 and protrudes to the outside through the through hole 3a of the bottom surface of the metal cover 3 is integrally molded. the hole 9a, and insert the through hole 3a of the cover 3 into the operating part 9b.
is held between the cover 3 and the mounting board 10 so as to protrude outward from the cover 3, and by fitting the hole 9a and the convex portion 10a, the axial runout direction of the operating shaft 9 is controlled. The structure is designed to eliminate wobbling. Further, the brush 6 is attached to the operating shaft 9 so as to be located around the outer periphery of the convex portion 10a, and the brush 6 is attached to the contactor 7 and the convex portion 10a.
are in contact with each other at their outer periphery. Further, the operating shaft 9 is in contact with the bottom surface of the metal cover 3 to restrict back and forth play against the tension of the operating shaft 9.

That is, in the present invention, a convex portion 10a integrally molded on the mounting board 10 is inserted through a through hole 3a in the bottom of the metal cover 3 and protrudes to the outside, and a hole 9a of the operating shaft 9 is fitted into the convex portion 10a. By aligning the metal cover 3 with the base of the metal cover 3 to prevent rattling in the shaft runout direction, and by restricting external tension on the operating shaft 9, the operating shaft can be supported without rattling even without using a bearing. It is something that can be done.

As is clear from the above, the present invention can be applied not only to the variable resistor described above as an example, but also to rotary electronic components such as capacitors, rotary switches, and rotary encoders, and is not within the scope of the present invention. Of course, it is something that goes inside.

Effects of the Invention As described above, the rotating electronic component of the present invention is fitted into the convex part integrally molded on the mounting board that protrudes through the hole of the operation shaft and the bottom part of the cover, and is attached to the bottom part of the cover. Therefore, since the tension on the operating shaft is regulated, it is possible to reduce the axial runout and back-and-forth rattling of the operating shaft without using a bearing, and it can be constructed at low cost.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a variable resistor which is an embodiment of the rotating electronic component of the present invention, Fig. 2 is an exploded perspective view of the same, and Fig. 3 is a sectional view of a variable resistor which is a conventional rotating electronic component. It is a diagram. 3...Metal cover, 9...Operation shaft, 9a...
Hole, 10...Mounting board, 10a...Protrusion.

Claims (1)

[Scope of utility model registration request] A cover having at least an opening on the top surface and a through hole on the bottom surface, a mounting board attached to the opening of the cover, and a mounting board that is integrally molded with the mounting board and is inserted through the through hole of the cover. The tension is regulated by a cylindrical convex part that protrudes to the outside and the bottom part of the cover, and a cylindrical hole that fits into the convex part of the mounting board and the bottom part of the cover. A rotary electronic component comprising the cover, which is provided with an operating part that is inserted into the through hole in the bottom part together with the convex part of the mounting board and protrudes to the outside, and an operating shaft held between the mounting board. .