| 摘要 |
PURPOSE:To suppress the variation of static capacitance of a capacitor formed between a fixed electrode and a moving electrode at switch closing, to reduce the cost and to simplify the titled switch by increasing the area of a depression part to depress the moving electrode downward more than the area of the moving electrode. CONSTITUTION:A depression part 3 of thick disk shape projected downward is provided to the lower face of a rim of the bottom shape and the lower face area of the depression part 3 is set larger Than the area of the moving electrode 9. When the depression part 3 is moved downward and pressed into contact with the upper face of the moving electrode 9, the depression part 3 covers the entire upper face of the moving electrode 9. Thus, the depression part depresses the entire upper face of the moving electrode and the moving electrode is in contact with the fixed electrode via the 2nd insulation film in a plane state, then the capacitor formed between the fixed electrode and the moving electrode is maximum at.Thus, the variatiou of the static capacitance at switch closing attended with the fluctuation of the operating state of the key is sppressed.
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