JPH05298955A - Moving contact device for push switch and its manufacture - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve productivity by realizing automatic assembly of push switches using dome-shaped click springs. [Structure] The metal hoop material 21 is punched to continuously form the movable contacts 23, 23, .... Moving contact 2
.. are connected to the hoop member 21 by supporting pieces 24, 24 ,. The movable contacts 23, 23, ... Are pressed into a dome shape to act as a click spring.
Resin bases 28, 2 around the movable contacts 23, 23, ...
Molding 8, ... The support pieces 24, 24, ... And the leg portions 26, 26, ... Are insert-molded in the bases 28, 28 ,. Support pieces 24, 24, ... And leg portions 26, 2
.. are cut from the hoop material 21, and a movable contact device in which the movable contact 23 is supported by a base 28 is manufactured. By integrally molding the base 28 and the movable contact 23, it is possible to automate the assembly by the automatic mount device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric switch, and more particularly to a movable contact device in a push switch using a disk-shaped click spring and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a push switch using a click spring in which a disk-shaped leaf spring is formed in a dome shape has been used for an operation panel of an electric device, a remote controller and the like. 7 and 8 show an example of this type of push switch. In the push switch 1 of FIG. 7, fixed contacts 3 and 4 are integrally molded on a resin base 2, and a movable contact 6 formed by molding a spring material into a dome shape is inserted into a recess 5 of the base 2. There is. A push button 7 is placed on the movable contact 6, and a cover 8 is mounted on the base 2 to position the push button 7. When the push button 7 is pressed, the movable contact 6 is reversed from the normal state and the two fixed contacts 3 and 4 are electrically connected.
When the push button 7 is released, the movable contact 6 returns to the state shown in the figure, and the conduction between the fixed contacts 3 and 4 is turned off.

In a push switch 11 shown in FIG. 8, two membranes 13 and 14 are bonded via a spacer 12, and movable contacts 15 are provided on the surfaces of the membranes 13 and 14 which face each other.
And a fixed contact 16 are provided. The dome-shaped click spring 17 is placed on the upper surface of the upper membrane 13, and the click spring 17 is fixed by further attaching a protective film to the surface thereof.

[0004]

A push switch 11 in which a click spring is mounted and fixed on the above-mentioned membrane.
Since it is difficult to automate the work of arranging the dome-shaped click spring 17 at a predetermined position of the membrane 13, it is a manual work and there is a problem in productivity. The integrated push switch 1 shown in FIG. 7 can be automatically mounted on a circuit board, but the work of incorporating the dome-shaped movable contact 6 into the base 2 has not been realized automatically, and the number of assembly steps is complicated. There is a problem that the number of parts is large. Further, it is not suitable when the total height of the switch itself is large and thinning is required.

Therefore, there is a technical problem to be solved in order to meet the demand for thinning and to enable automatic mounting to improve productivity, and the present invention aims to solve the above problems. To do.

[0006]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above-mentioned object, and a supporting piece is formed from a side edge portion of a self-resetting type click spring in which a conductive leaf spring material is formed in a dome shape. Extending, the support piece is insert-molded on a resin base to form a movable contact device, the movable contact device is fixed to a fixed contact portion provided on a circuit board, and the click spring is provided above the fixed contact. The movable contact device in the push switch, which is configured to position the switch, and the hoop material of the conductive leaf spring are punched to connect the disc portion and the remaining peripheral portion and the disc portion and the peripheral portion. A support piece is formed, and the disk portion and the support piece are continuously arranged side by side on the same hoop material, and the disk portion is processed into a dome shape to form a click spring, and the support piece is formed on the resin base. Inserter Molding, said support piece intended to provide a method of manufacturing in the movable contact device in push switch to create a movable contact device by cutting from the peripheral portion.

[0007]

In the movable contact device according to the first aspect, since the dome-shaped click spring is mounted on the base, it is possible to automatically mount the click spring on the circuit board, which is difficult to assemble with the automatic mounting device. By disposing the fixed contacts on the circuit board, a push switch is configured by the mounted movable contact device and the fixed contacts.

In the manufacturing method according to the second aspect of the present invention, the hoop material is punched, pressed, etc., and the base is molded on the hoop material formed in a state in which a large number of click springs are connected. After the support piece is insert-molded in the base, the support piece is cut from the hoop material to efficiently produce a large number of movable contact devices.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2 show a hoop material 21 in which a conductive metal leaf spring material is formed in a band shape and which is punched. The substantially C-shaped punched holes 22, 22, ... Are made to face each other and punched to form a disk-shaped movable contact 23 at the central portion and runner-shaped support pieces 24, 24 on the left and right sides. In this way, the movable contacts 23, 23, ... Are continuously formed in the longitudinal direction of the hoop material 21, and the movable contacts 23, 23 ,. 4 near the periphery of the movable contacts 23, 23, ...
The concave portions 25, 25, 25, 25 at the places are provided.

Further, the movable contacts 23, which are continuously arranged,
23, ... Connecting portions 21a of the hoop material 21 left between
21a, ... to the movable contacts 23, 23 ,.
6, 26, ... are formed and are formed by press working as shown in FIG.
As shown in FIG. 5, the leg portions 26, 26, ... Are provided with stair-like steps and are lowered to come into contact with the plate surface of the circuit board described later. In addition, holes 27, 27, ... Engaging with an automatic feeding device (not shown) are provided in the vicinity of both side edges of the hoop member 21.

Next, as shown in FIG. 3 and FIG. 4, resin bases 28, 28, ... Are provided around the movable contacts 23 ,.
Insert-mold. Thereby, the support pieces 24, 2
, And the legs 26, 26, ... Are inserted into the bases 28, 28 ,. Then, the support pieces 24, 24 of the movable contact 23 are cut along the outer periphery of the base 28 to form the punched hole 2
Along the outer edges of 2,22 the legs 26,26,26,2
6 is cut to form the movable contact device 31 shown in FIGS. 5 and 6. As shown in FIG. 6, on the upper surface of the base 28 of the movable contact device 31, a polyimide tape conforming to the outer edge shape of the base 28 is attached to protect the movable contact 23 from the protective cover 29.
And

The completed movable contact devices 31, 31, ... Are enclosed in an embossing tape for an automatic chip mounting device to produce a taping product of the movable contact devices 31, 31 ,. The step of attaching the protective cover 29 described above may be performed before the movable contact 23 is cut from the hoop material 21.

FIG. 6 shows the movable contact device 31 fixed at a predetermined position on the printed wiring board 32. Printed wiring board 32
Two fixed contacts 33, 34 are arranged at positions facing the vicinity of the central portion of the movable contact 23. Also, the leg 2
6, 26, 26, 26 are soldered to fixing lands (not shown) on the printed wiring board 32. When the movable contact 23 is pressed downward through the protective cover 29, the movable contact 23
Are recesses 25, 25, 25, 2 in contact with the wiring board 32.
5 is a fulcrum, and it inverts and contacts the fixed contacts 33 and 34, and two fixed contacts 33 and 34 are conducted. When the pressure is released, the movable contact 23 returns to the state shown in FIG. 6 by its own restoring force, and the conduction between the fixed contacts 33 and 34 is cut off.

By providing the concave portions 25, 25, 25, 25, the click feeling at the time of reversing and restoring the movable contact 23 becomes clear, and a good operation feeling can be obtained. still,
The present invention should not be limited to the present embodiment, and various modifications can be made without departing from the spirit of the present invention, and it goes without saying that the present invention extends to those modifications.

[0015]

According to the first aspect of the present invention, since the dome-shaped movable contact and its base are integrally formed, it is possible to automatically mount the movable contact, which was difficult to perform, thereby improving productivity. It can be significantly improved. Then, by arranging fixed contacts on the circuit board and fixing the movable contact device at a predetermined position, a thin push switch is configured,
The number of parts is reduced as much as possible, which contributes to cost reduction.

According to a second aspect of the present invention, a hoop material is punched out to be formed into a shape in which a large number of movable contacts are connected, a base is insert-molded on the hoop material, and then each movable contact device is cut from the hoop material. Therefore, it is easy to handle and the productivity is good, and it is effective in reducing the manufacturing cost in mass production.

[Brief description of drawings]

FIG. 1 is a front view of a hoop material.

FIG. 2 is a side view of a hoop material.

FIG. 3 is a front view of a hoop material in which a base is insert-molded.

FIG. 4 is a side view of a hoop material in which a base is insert-molded.

FIG. 5 is a front view of a movable contact device.

FIG. 6 is a cross-sectional view of a movable contact device mounted on a printed wiring board.

FIG. 7 is a sectional view of a conventional push switch.

FIG. 8 is a sectional view of a conventional membrane type push switch.

[Explanation of symbols]

 21 Hoop Material 22 Punching Hole 23 Movable Contact 24 Supporting Part 25 Recessed 26 Leg 27 Hole 28 Base 29 Protective Cover 31 Movable Contact Device 32 Printed Wiring Board 33, 34 Fixed Contact

Claims (2)

[Claims] 1. A movable contact device is formed by extending a supporting piece from a side edge portion of a self-resetting type click spring formed of a conductive leaf spring material in a dome shape, and insert-molding the supporting piece on a resin base. A movable contact device in a push switch, wherein the movable contact device is fixed to a fixed contact portion provided on a circuit board, and the click spring can be positioned above the fixed contact to form a push switch. 2. A hoop material of a conductive leaf spring is punched to form a disk portion and a residual peripheral portion and a support piece connecting the disk portion and the peripheral portion, and the disk portion and the support piece are the same hoop material. And the disk parts are processed into a dome shape to form a click spring, and the support piece is insert-molded on the resin base, and the support piece is cut from the peripheral part to move. The method for manufacturing a movable contact device in a push switch according to claim 1, wherein a contact device is produced.