| 摘要 |
PURPOSE: A tact switch is provided to prevent system malfunction by forming a spheric groove on an upper face of an operation portion and inserting an operation post-projection of a multi-button into the spheric groove. CONSTITUTION: A dome contact portion(2) is installed on a printed circuit board(1) in order to perform an electric switching circuit operation. An operation button portion(6) includes a hemispheric contact portion(3) and a button projection(5). The hemispheric contact portion(3) is contacted with a center portion of the dome contact portion(2) in order to apply a function setup signal. The button projection(5) includes a fixing groove(4) having an operation post-projection(73) of a multi-button. A body portion is punched to mount the hemispheric contact portion(3) of the operation button portion(6). A combination ring is formed at a cover portion. A center portion of the cover portion is punched to mount the button projection(5).
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