JPH0443367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a push button switch used in a small keyboard.

Conventional Structures and Their Problems In recent years, push button switches used in small keyboards have been required to be thin and easy to assemble.

A conventional push button switch of this type is shown in FIG.
A spacer 4 having an opening 3 is arranged on an insulating substrate 2 having a contact 1 in a portion where the contact 1 is provided,
A diaphragm 5 made of a spherical elastic metal plate is placed in the opening 3 of the spacer 4, an elastic sheet 6 is placed on top of the diaphragm 5, and a push button held in the hole 8 of the frame 7 is placed on top of the diaphragm 5. It had a configuration of 9.

With this configuration, the push button 9 is moved downward with a fingertip, the seat 6 and the diaphragm 5 are flexed, and the contacts 1 are brought into conduction, thereby switching the switch.

However, when the keyboard body is carried around or operated by hand, play (gap) occurs between the push button 9 and the frame 7, causing a rattling noise, which reduces the product value, and when the push button 9 is operated. This backlash caused problems such as poor operating feel.

Purpose of the Invention The present invention provides a push-button switch that eliminates the problems of the prior art described above, eliminates the rattling noise when the keyboard body is shaken, and provides an excellent operating feel when pressing the push-buttons. .

Structure of the Invention In order to achieve the above object, the push button switch of the present invention is provided by disposing a spacer having an opening at a position corresponding to the contact on an insulating substrate provided with a contact, and placing a spacer in the opening. A diaphragm made of a spherical metal is housed, and an elastic sheet with a spherical bulge projecting upward that is smaller than the radius of curvature forming the diaphragm and whose shoulder abuts on the diaphragm is mounted on the spacer. A push button fitted into the window hole of the frame is arranged at the upper part of the elastic sheet corresponding to the opening, and the lower surface of the push button is brought into contact with the bulge.

The elastic sheet provided with this spherical bulge eliminates the noise generated when the keyboard body is used, and at the same time provides a push button switch with an excellent operating feel when pressing the push button.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows the structure of a push button switch in one embodiment of the present invention.

Reference numeral 11 denotes an insulating substrate having contacts 12, and an opening 1 is provided on the insulating substrate 11 at a portion where the contacts 12 are provided.
3, a diaphragm 15 made of a spherical elastic metal plate is placed in the opening 13 of the spacer 14, and a diaphragm 15 made of a spherical elastic metal plate is placed on top of the spacer 14 in a portion corresponding to the opening 13 of the spacer 14. An elastic sheet 17 is integrally provided with a spherical bulge 16 having a radius of curvature smaller than the radius of curvature forming the protruding diaphragm 5.A shoulder 16a of this bulge abuts the diaphragm 15, and the bulge 16 The diaphragm 15 is placed over the diaphragm 15, and a button 20 held in the hole 19 of the frame 18 is disposed on the bulge 16.

The operation of the push button switch configured as described above will be explained below.

First, press the push button 20 with your fingertip, and the downward movement of the push button 20 causes the elastic sheet 17 and the diaphragm 1 to
5 is bent to establish conduction between the contacts 12, thereby operating the switch. When the pressing force from the fingertip is released, the push button 20 returns to its upward movement due to the elasticity of the diaphragm 15 and the bulge 16 of the elastic sheet 17.

Since the push button switch of the embodiment is constructed as described above, by providing the elastic sheet 17 provided with the protruding spherical bulge 16, the push button 2
This absorbs the play between 0 and the frame 18, thereby preventing the occurrence of rattling noise, and eliminating the rattling of the push button to improve the operating feeling. Further, since the conventional elastic sheet 17 is simply formed and the spherical bulge 16 is provided, the above effects can be easily achieved without adding any parts, and an inexpensive push button switch can be provided.

Effects of the Invention As described above, according to the present invention, the shoulder of the spherical bulge having a radius of curvature smaller than the radius of curvature of the protruding diaphragm comes into contact with the diaphragm, so that the bulge is placed on the diaphragm. By providing the elastic sheet in such a way that the bulge absorbs the play of the push button and prevents noise caused by the play, it is possible to provide a push button switch with an excellent operating feel. In addition, since the elastic sheet is simply provided with a spherical molded portion, there is no need to add any additional parts, and the product can be provided at low cost, which has great practical value.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a conventional push-button switch, Fig. 2 is a cross-sectional view showing an embodiment of the push-button switch of the present invention, and Fig. 3 is a cross-sectional view showing an enlarged main part of the push-button switch. . 11... Insulating substrate, 12... Contact, 13... Opening, 14... Spacer, 15... Diaphragm,
16... Swelling part, 16a... Shoulder part, 17...
Elastic sheet, 18... frame, 19... hole,
20...Push button.

Claims (1)

[Claims] 1 A push switch having a diaphragm made of a spherical metal plate mounted on an insulating substrate having at least a contact point, and a bulge provided to protrude upward from the diaphragm with a radius of curvature smaller than the radius of curvature of the diaphragm. an elastic sheet integral with the bulge, which is attached so that the shoulder of the bulge comes into contact with the diaphragm and the bulge is placed on the diaphragm; and an upper part corresponding to the bulge. A push button switch that fits into a window hole in a frame and a push button that abuts the bulge.