Patent ID: 7429707
Filing Date: 2008-09-30
Classification: H01H

Abstract:
1. A push switch comprising: a switch case made of insulating resin, the switch case including a central fixed contact on an inner bottom center of its recess that has an open top, and a peripheral fixed contact disposed at points symmetrical about the central fixed contact, and the switch case having a plurality of first grooves in an inner side wall of the recess; a first movable contact made of a resilient thin metal plate curved into a dome shape protruding upward, the first movable contact including a ring portion with a central hole disposed over the peripheral fixed contact such that the ring portion opposes the peripheral fixed contact at a distance, and a plurality of legs extending from an outer rim of the ring portion, the legs being provided at positions corresponding to the first grooves; and a second movable contact made of a resilient thin metal plate curved into a dome shape protruding upward, the second movable contact being placed on the ring portion of the first movable contact; wherein a pressing force for resiliently inverting the second movable contact is set greater than a pressing force for resiliently inverting the first movable contact, and two tactile feedbacks are produced by applying a pressure from a side of the second movable contact.