| 摘要 |
PROBLEM TO BE SOLVED: To provide a dome type metal spring and a switch using it with superior durability against increase in the number keying times of a switch for enduring remarkably increased switch operations in a mobile telephone or the like. SOLUTION: A dome type metal spring can be provided not breaking even by keying of three million times and having a small P1 reduction rate since it is formed by stainless steel with hardness Hv of 500-650. A switch with superior durability and an electronic apparatus enduring prolonged usage can be provided since the switch is composed of the dome type metal spring, a stationary contact and a lead circuit.
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