| 摘要 |
PROBLEM TO BE SOLVED: To provide a push button switch using a metal dome in which stable contact between a metal dome and a fixed electrode is secured without using a through-hole of a printed-circuit board, and its stable contact is maintained even when the push-button switch is operated many times, and furthermore to obtain the same inexpensively. SOLUTION: The push-button switch has a circuit connected without using a through-hole, and has a center electrode with which the top of the metal dome is in contact when the push-button switch is pushed and a ring-shape electrode with which the outer circumference of the metal dome is in contact, formed by printing a conductive ink on the printed-circuit board, and is constructed by mounting the metal dome with spring property on these fixed electrodes. The constitution of the printed layer is made identical throughout the whole area of the range of the ring-shape electrode with which the metal dome is in contact. COPYRIGHT: (C)2011,JPO&INPIT
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