JPS61131508A - Electric part and composite molding thereof - 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 Field of the Invention The present invention relates to an electrical component such as a variable resistor having a movable shaft, and a composite molding method thereof.

Conventional Structures and Their Problems In recent years, there has been a demand for highly reliable and economical electrical components and their composite molding methods.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a conventional electrical component and a composite molding method thereof as described above will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a conventional electrical component. FIG. 2 is a longitudinal sectional view of a variable resistor equipped with conventional electrical components. FIG. 3 is a top view of the substrate of FIG. 2. 1 to 3, 1 has an operating i44. hot water,
*! It is integrally formed with K7J, □o, waya□o, 1, and cuff, -2 by composite molding, and the shaft 1 is configured to be non-removable and rotatable relative to the cover 2. 3 is a central terminal plate having a cylindrical portion 3a. Reference numeral 4 designates an insulating substrate, which has a through hole 4aQ in the center, and has a horseshoe-shaped resistor film 5 formed on its main surface, both ends of which are connected to electrodes 6, respectively. 7 is connected. The cylindrical portion 3a of the central terminal plate 3 is inserted into the through hole 4a of the substrate 4 from the other main surface side of the substrate 4, the substrate 4 is placed on the central terminal plate 3, and the substrate 4 is then placed on the central terminal plate 3. An insulating seat plate 8 is placed on the seat plate 8, and a slider 9 is provided on the seat plate 8, which is made of a conductive material having spring properties and is provided with a contact 9a that presses against the resistor film 5. After being placed, the tip of the protruding cylindrical portion 3a is caulked so that the slider 9 can rotate around the cylindrical portion 3a. Next, the shaft 1 and the cover 2 are integrally formed, and the small diameter portion of the shaft 1 is inserted into the cylindrical portion 3& of the central terminal plate 3, and the shaft 1 and the slider 9 are engaged. The cover 2 and the substrate 4 are fixed together in this manner.

The operation of the variable resistor including the electrical components configured as described above will be described below.

First, when a jig such as a screwdriver is engaged with the operating groove 1a provided on the shaft 1 and the shaft 1 is rotated, the sliding member provided so as to rotate together with the shaft 1 is rotated. The contact 9a of the mover 9 slides on the resistor film 5 to obtain a desired resistance value.

However, in the above configuration, it is necessary to provide the cylindrical portion 3a on the central terminal plate 3, and the substrate 4 is placed on the central terminal plate 3, and the cylindrical portion 3a is formed integrally with the cover 2. The shaft 1 is engaged with the cylindrical portion 3a formed on the central terminal plate 3, and the cover 2 is fixed to the board 4, but there are many problems in positioning, etc. due to cumulative errors 9 during assembly. It also had the disadvantage of becoming larger.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a compact, highly reliable and economical electrical component and a composite molding method thereof.

Structure of the Invention To achieve this object, the electrical component of the present invention includes a holding plate, a shaft, and a cover integrally formed, and a part of the shaft being disposed between the holding plate and the cover. At the same time, both end surfaces of the shaft are not covered by the cover, and due to this structure, the shaft is formed so that it cannot be removed from the cover and is rotatable, which reduces the cumulative error of assembly (9), positioning, etc. The problem of this is reduced, and the size can be made smaller.

Further, in the composite molding method for electrical components of the present invention, the shaft is arranged so that a part of the axial projection surface of the shaft is entirely in contact with the holding plate,
sandwiching the holding plate and the shaft, and bringing a first composite molding mold and a second composite molding mold that form a cover part into close contact with each other;
By injecting a cover material into the mold and curing it, a part of the shaft is disposed between the holding plate and the cover without covering both end surfaces of the shaft with the cover. The holding plate, the shaft, and the cover are integrally formed, and the shaft is configured to be non-removable and rotatable with respect to the cover.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a longitudinal sectional view of an electrical component in one embodiment of the present invention. 6A and 6B are a front view and a bottom view of the shaft of the electrical component shown in FIG. 4. 4 and 6, reference numeral 1o denotes a shaft made of a metal or resin material having an operating groove 10a at one end and an engaging surface 1of at the other end, and the shaft 10 is made of a metal, resin, or ceramic material. A retaining plate 1 consisting of
1 and a cover 12 made of a resin material or a metal material are integrally formed, a part 10e of the shaft 10 is disposed between the retaining plate 11 and the cover 12, and the shaft 1
Both end surfaces 10b and 10c of o are not covered by the cover 12. With this configuration, the shaft 10 is formed so that it cannot fall off and is rotatable relative to the cover 12.

FIG. 6 is a longitudinal sectional view illustrating a composite molding method for electrical parts in an embodiment of the present invention. In FIG. 6, the shaft 10 is arranged so that a part (or all) 10d of the axial projection plane of the shaft 1o is in contact with the holding plate 11, and the holding plate 11 and the shaft 1° are sandwiched. Then, the first composite mold 121 having a cavity 121a forming the cover 12 and the second composite mold 122 having a cavity 122a are brought into close contact with each other, and the material for the cover 12 is placed in the mold. By injecting and hardening, a part 10e of the shaft 1o is disposed between the retaining plate 11 and the cover 12, and the both end surfaces 10b, 10 of the shaft 10 are
C is not covered by the cover 12, and the shaft 10 is formed so that it cannot fall off and is rotatable relative to the cover 12.

FIG. 7 is a longitudinal sectional view of a variable resistor equipped with the electrical component of the present invention. FIG. 8 is a top view of the substrate of FIG. 7. 7th
In FIG. 8, reference numeral 14 denotes an insulating substrate, and both ends of the entire surface of the substrate 14 are connected to electrodes 16, respectively. A horseshoe-shaped resistor film 15 is formed, and terminals 17 are connected to the electrodes 16, respectively. said shaft 1
A slider 13 made of a conductive material having spring properties is attached to engage with the retaining surface 1of at the other end of the slider 1of.

One side of the slider 13 is in contact with the holding plate 11, and the other side is formed with a contact 13a that comes into pressure contact with the resistor film 16. A seat plate 18 is further inserted into the other end of the shaft 1o, and then the substrate 14 is attached to the resistor film 15.
The slider 13 is combined and fixed with the cover 12 so that the contacts 13a of the slider 13 are in contact with each other.

The operation of the variable resistor, which is a practical example of the electrical component of the present invention configured as described above, will be described below.

First, the operating groove 10a provided in the shaft 1o
When a jig such as a screwdriver is engaged with the shaft 10 and the shaft 10 is rotated, the contact 13a of the slider 13, which is provided so as to rotate together with the shaft 10, contacts the resistor film 16.
The desired resistance value can be obtained by sliding it on the top.

As described above, according to this actual winding example, since the holding plate, shaft, and cover are integrally formed, the cumulative error of assembly is 2.
Problems such as positioning become easier, and dimensions can also be made smaller.

In the above embodiment, the holding plate 11 is integrally fixed with the cover 12, but the holding plate 11 is shaped like a disk and the shaft 10
It may also be made to rotate together with.

Furthermore, although the seat plate 18 is present in the embodiment of the variable resistor equipped with the electrical component of the present invention, it goes without saying that it is possible to configure the seat plate 18 without it.

Effects of the Invention As described above, the present invention provides a structure in which the holding plate and the shaft are connected so that both end surfaces of the shaft are not covered by the cover and a part of the shaft is disposed between the holding plate and the cover. Since the cover is formed integrally with the cover and the shaft is provided so that it cannot fall off and is rotatable with respect to the cover, there is little cumulative error in assembly, easy positioning, etc., and the size is also improved. It can be made smaller, has higher reliability, and is more economical9, which has great practical effects.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a conventional electrical component, Figure 2 is a vertical cross-sectional view of a variable resistor equipped with a conventional electrical component, Figure 3 is a top view of the board in Figure 2, and Figure 4 is a bookmark. 5A and 5B are a front view and a bottom view of the shaft of the electrical component in FIG. 4, and FIG. 6 is a composite of the electrical component in a sister embodiment of the present invention. FIG. 7 is a longitudinal sectional view for explaining the molding method; FIG. 8 is a longitudinal sectional view of a variable resistor equipped with the electrical component of the present invention;
The figure is a top view of the substrate of FIG. 7. 1o... shaft, 10 a... operating groove,
10b, 10c... End face of shaft 1o, 1od...
...Part of the axial projection plane of the axis 10, 10e...
... Part of shaft 10, 10f... Engagement surface, 12.
...cover, 11 holding plate, 14...substrate, 121...first composite molding mold, 122...
...Second composite mold, 121a, 122a...
...Cavity forming the cover 12. Name of agent: Patent attorney Toshio Nakao and one other person 1゜Figure 3Figure 4

Claims (9)

[Claims] (1) A portion of the shaft is disposed between the retainer plate and the cover so that both end surfaces of the shaft are not covered by the cover;
An electrical component characterized in that the holding plate, the shaft, and the cover are integrally formed, and the shaft is configured to be non-removable and rotatable with respect to the cover. (2) The electrical component according to claim 1, wherein the holding plate and the shaft are made of a metal material, and the cover is made of a resin material. (3) The electrical component according to claim 1, wherein the holding plate is made of a metal material, and the shaft and the cover are made of a resin material. (4) The electrical component according to claim 1, wherein the shaft is made of a metal material, and the holding plate and the cover are made of a resin material. (5) The electrical component according to claim 1, wherein the holding plate, the shaft, and the cover are made of a resin material. (6) The electrical component according to claim 1, wherein the holding plate is made of a ceramic material, the shaft is made of a metal material, and the cover is made of a resin material. (7) The electrical component according to claim 1, wherein the holding plate is made of a ceramic material, and the shaft and the cover are made of a resin material. (8) The electrical component according to claim 1, wherein the holding plate, the shaft, and the cover are made of a metal material. (9) A first composite molding mold in which a shaft is arranged such that a part or all of the axial projection surface of the shaft is in contact with a retaining plate, and the retaining plate and the shaft are sandwiched to form a cover part. and a second composite mold are brought into close contact with each other, and a cover material is injected into the mold and cured, so that a part of the shaft is covered with the cover so that both end surfaces of the shaft are not covered with the cover. The holding plate, the shaft, and the cover are integrally formed so as to be disposed between the holding plate and the cover, and the shaft is configured to be non-removable and rotatable with respect to the cover. A composite molding method for electrical parts characterized by: