| 摘要 |
PROBLEM TO BE SOLVED: To provide a push-button switch structure wherein respective contacts are never turned on at the same time by a normal push-button operation. SOLUTION: Four make contacts 3, 4, 5 and 6 are respectively disposed in one push button in directions along a crisscross form. On the back side of the push button, a projecting block 2 functioning as a stopper for restricting depressing stroke of the push button immediately before turning on the four make contacts in pressing the push button is disposed. The push button is so structured that four projecting parts a12, a14, a23 and a34; or b1, b2, b3 and b4 respectively positioned at four apexes of a virtual rectangle 2c are disposed on the projecting block 2 so as to allow equivalent depressing stroke in the push-button structure with respect to the opposite surface of the four projecting parts, and the distances between each of the four projecting parts and two out of the four make contacts 3, 4, 5 and 6 adjacent to the projecting part are set different from each other. COPYRIGHT: (C)2004,JPO
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