Key switch

Abstract

The invention relates to a key switch which comprises a shell, a cover board, a first fixed terminal, a second fixed terminal, and a domed moving terminal. The top of the shell provided with an inner space is provided with an opening. The cover board covers the top opening of the shell. Each of the first fixed terminal and the second fixed terminal is provided with a connecting sheet disposed at the inner bottom of the shell. The domed moving terminal is disposed in the shell. The top of the domed moving terminal can elastically deform and restore under the action of pressure so as to allow the connecting sheet of the first fixed terminal and the connecting sheet of the second terminal to mutually connect or disconnect. The cover board is made of a metal board capable of elastically deforming and restoring, and the edge of the cover board is fixed on the shell. The center of the cover board bulges down to form a key protrusion which can contact with an apex of the moving terminal. The cover board covering the opening of the shell of the key switch is capable of pressing the apex of the moving terminal so as to serve as a switch key, the number of parts is reduced, the longitudinal thickness of the switch is reduced, and the shell and the cover board can be assembled by single process.

Description

technical field [0001] The present invention relates to a push-button switch device. Specifically, it relates to a push-button switch device, which uses a cover plate covering the opening of the switch housing to press down the apex of the dome-shaped movable terminal. , which also acts as a switch button, not only reduces the number of components, but also further reduces the longitudinal thickness. Background technique [0002] Generally speaking, push-button switch devices are mostly used in mobile phones, game machines, various electronic instruments, etc. The composition and structure of the push-button switch devices in the prior art are as follows: Figure 5 As shown, its composition includes: a shell 1 with one side open and made of insulating resin; a dome-shaped movable terminal 2 and a plurality of fixed terminals 3 arranged in the shell 1; A button 4 of the movable terminal; and a cover plate 5 covering the opening of the casing 1 . [0003] By pressing the butt...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned key device of the prior art, since the key 4 that pressurizes the apex of the movable terminal 2 is provided, its longitudinal thickness is relatively thick, and the top of the key 4 is exposed through the through hole of the cover plate 5, so it is easy to pass through the cover plate 5. Dust enters the gap between the button and button 4

[0006] In addition, in order to complete the assembly, it is necessary to sequentially perform the process of inserting the coupling protrusion 1a of the housing 1 into the coupling hole 5a of the cover plate 5 and thermally fusing the coupling protrusion 1a protruding from the coupling hole 5a to expand its cross-sectional area. Therefore, the assembly process increases, which reduces the production efficiency, and when automatic assembly is implemented, the cost is increased

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