| 摘要 |
PROBLEM TO BE SOLVED: To provide a switch which is excellent in the stability of electrical contact without shortening the service life of a contact spring having click action and a dome shape, and also assures required stroke even for eccentric operation loading with little variation in click touch. SOLUTION: A switch has a recessed portion 9 formed in the central part of a contact spring 3 or a movable portion 8 having click action with a dome shape, and by establishing line contact between an edge portion 10 formed around the recessed portion 9 and the surface of a fixed contact portion 13, the stability of electrical contact between them is ensured, and entering of dusts and shortening of service life of the contact spring 3 are prevented by using the movable portion 8 formed without a hole. In addition, required stroke is ensured and variation in click touch is made smaller by forming the dome portion 5 with a spherical surface in the central portion of the contact spring 3 as well as by forming a skirt portion 6 with a conical surface on the periphery of the dome portion 5. COPYRIGHT: (C)2004,JPO
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