Push switch

Abstract

A push switch includes a lower case having a recess therein, an inner and outer fixed contacts exposing from a bottom of the recess, a movable contact accommodated in the recess, an upper case attached to the lower case, an elastic operation body for sealing the recess of the lower case, and a push button provided on the elastic operation body. The movable contact has a dome shape having a concavesurface facing the inner fixed contact by a distance, a convex surface opposite to the concave surface, and an outer peripheral end placed on the outer fixed contact. The upper case has a through-hole located above the recess of the lower case. The has a lower surface contacting the convex surface of the movable contact, an upper surface opposite to the lower surface, and an outer edge held between the upper case and the lower case while being compressed. The push button is inserted into the through-hole of the upper case movably. This push switch prevents dust from entering in the switch andoperates reliably.

Description

technical field [0001] The present invention relates to push switches. Background technique [0002] Push switches with a light click feel are often used in the input operation parts of various electronic devices. In particular, in an input device of a computer such as a mouse, it is preferable to use a push switch that can be operated with a light operation force and has a long operation stroke in order to reduce finger fatigue. [0003] 6 and 7 are a sectional view and an exploded perspective view, respectively, of a conventional push switch 501 disclosed in Japanese Patent Application Laid-Open No. 9-147666. The box-shaped lower case 1 made of insulating resin is formed with a concave portion opening upward. On the bottom surface of the concave portion of the lower case 1, the inner fixed contact 2A and the outer fixed contacts 3A, 3B are exposed from the bottom surface and fixed by insert molding. The inner fixed contact 2A is provided at the center of the bottom surf...

AI Technical Summary

Problems solved by technology

Therefore, during the working process of pressing the switch 501, the dust outside the switch 501 will enter the recess of the lower case 1 through the gap 501A, thereby hindering the contact between the movable contact 4 and the fixed contact, so that the switch 501 cannot work normally.

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