JPS6140002A - Rotary operation type electronic part - 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 Field of Application The present invention relates to variable resistors and switches commonly used in consumer electronic equipment such as video equipment such as televisions and videos, and audio equipment such as radios and stereos. This relates to rotary-operable electronic components such as the following.

Conventional Structures and Problems Generally, rotating electronic components are required to have operating shafts with different shapes and dimensions depending on the equipment in which they are used.

Taking a rotary-operable variable resistor as an example, its operation shaft has conventionally been mainly a metal shaft, but in recent years, insulated shaft types have been increasingly used from the standpoint of safety.

In the case of a metal shaft type, the structure is generally as shown in FIG.
The operating shaft 5 and the rotary body 2 were connected by inserting the end 5a of the operating shaft 5 supported through the bearing 4 and caulking the tip 5b.

In this case, the operating shaft 5 is made by cutting the outer diameter of a metal rod and does not require a mold or the like, so it is easy to meet various demands.

On the other hand, in the case of an insulated shaft type, the structure is generally as shown in FIG. It was made of material. In this case, if an attempt is made to change the operating shaft portion 9, since the rotating body 7 portion is also integrally molded, a new mold for the entire mold must be manufactured, and it is necessary to make a new molding die for the entire rotating body. This required a lot of effort (time and money).

Purpose of the Invention The present invention aims to solve the above-mentioned drawbacks of the insulated shaft type, and provides an insulated shaft type rotation that can meet various demands with almost the same effort (cost and time) as the case of a metal shaft. The aim is to realize electronic components that can be manufactured using electronic components.

Structure of the Invention In order to achieve the above object, the present invention provides the following features: A non-circular hole is formed in the center of a rotary body made of an insulating material equipped with a movable contact, and a non-circular hole is formed at a distance in the axial direction from this inner-shaped hole. forming a thin-walled cylindrical portion having a recess on the inner surface, pushing the thin-walled cylindrical portion open and fitting an operating shaft having a protrusion capable of engaging with the recess into the non-circular hole, so that the thin-walled cylindrical portion has a radius In order to prevent the casing from opening outward, a hole is formed in the casing into which the thin cylindrical portion is fitted.

DESCRIPTION OF EMBODIMENTS FIG. 3 shows a rotary variable resistor according to an embodiment of the present invention. In the figure, a resistance element 12 is formed on the surface of a substrate 11 by means such as printing, and a sliding contact (movable contact) 13 slides and rotates on the resistance element 12.
The rotary body 14 made of insulating material is equipped with a rotary operation shaft 15.
A non-circular hole 16 for insertion is drilled in its center. Further, a thin cylindrical portion 11 having flexibility is formed at the upper part of the rotating body 14 . As shown in FIG.
It is divided (or may be divided into 3 to 4 parts), and each divided part has a concave portion 18 formed by a depression or a through hole on the inside. ' On the other hand, the rotary operation shaft 15 is machined to have the same shape and dimensions as the hole 1B so that its lower end 19 fits into the non-circular hole 16 at the center of the rotating body 14, as shown in FIG. 4a. has been done.

Further, a projection 20 is provided at a slightly upper portion of the lower end tip 19 so that the lower end tip 19 fits into the recess 18 of the thin cylindrical portion 11 into the socket fitted into the non-circular hole 16.
is formed.

The tip 19 of the operating shaft 15 is inserted into the non-circular hole 1 of the rotating body 14.
Figure 5 shows the state in which the operating shaft 1 is inserted.
5 is inserted into the non-circular hole 16 of the rotating body 14, the protrusion 20 of the shaft 15 pushes open the thin cylindrical part 17 of the rotating body 14, and when it is inserted to a predetermined position, the ring 15 The projection 20 is located in the recess 1 of the thin cylindrical portion 17 of the rotating body 14.
It is designed to fit inside the 8.

In this state, the operating shaft 15 and the rotating body 14 are connected, but when the variable resistor is assembled, this thin cylindrical portion 17 is inserted into the hole in the variable resistor housing 21, as shown in FIG. 22, and when the operating shaft 15 is pulled in the axial direction, the thin cylindrical portion 17 of the rotating body 14 opens outward, and the protrusion 20 of the shaft 15 is pulled out from the recess 18, and rotates with the operating shaft 15. The structure is such that the body 14 is prevented from becoming uncoupled.

As another embodiment, as shown in FIG. 6, the operating shaft 15 and the rotating body 14 are supported by a hole 22 on the front surface of the housing, and a rear end portion 23 of the operating shaft 15 passes through the center of the rotating body 14. hole 2 in the rear end of the housing 21 (i.e., the board 11)
5 can also be supported, and with this, the operation shaft 15 can be held more stably.

Effects of the Invention As described above, according to the present invention, it is only necessary to make the shaft portion in response to various requests for operating shafts, and therefore, even in response to requests for insulated shaft types, the molding die for the rotating body Since only the rod-shaped operating shaft part that does not include the part is required, it is simple and easy to deal with.

In addition, since the rotating body part is shaped to be compatible with metal shafts, it is highly compatible with various types of products. Furthermore, even if the operating axis changes, the rotating body remains the same, so the parts for attaching the movable contacts to the rotating body can be made in advance, streamlining the process and making it highly practical. Also, in terms of characteristics, even if the protrusion of the shaft tries to push open the thin cylindrical part of the rotating body when the operating shaft is pulled in the axial direction, the thin cylindrical part fits inside the hole in the housing. , its tensile strength can be several times stronger than in the case of simple press-fitting.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional example of a metal shaft type, Fig. 2 is a sectional view of a conventional example of an insulated shaft type, Fig. 3 is a sectional view of an embodiment of the present invention, and Figs. 4 a and b are rotational views. FIG. 5 is a perspective view showing a state in which the rotating body and the operating shaft are coupled, and FIG. 6 is a sectional view of another embodiment of the present invention. 14... Rotating body made of insulating material, 15... Rotating operation shaft,
16... Non-circular hole, 17... Thin cylindrical part, 18...
・Recess, 20...Protrusion, 21...Casing, 22...
Hole, 23... Rear end agent Yoshi Morimoto
Hiro 1st figure 2nd figure

Claims (1)

[Claims] 1. A non-circular hole is formed in the center of a rotary body made of an insulating material on which a movable contact is mounted, and a recess is formed on the inner surface at a distance from the non-circular hole in the axial direction. forming a thin-walled cylindrical portion having a cylindrical portion, and inserting into the non-circular hole an operating shaft having a protrusion that can be engaged with the recess by pushing the thin-walled cylindrical portion open, and causing the thin-walled cylindrical portion to open radially outward. A rotationally operated electronic component characterized in that a hole is formed in the casing into which the thin-walled cylindrical portion is inserted in order to prevent the thin-walled cylindrical portion. 2. Support the thin cylindrical part with the hole in the front of the housing,
2. The rotary-operable electronic component according to claim 1, wherein the rear end portion of the operating shaft passing through the center of the rotating body made of an insulating material is supported by a rear hole of the casing.