| 摘要 |
PROBLEM TO BE SOLVED: To adjust pressing force required for an on-operation of a tact switch without touching the tact switch by forming ribs for adjusting operation load which are located substantially symmetrically across a knob of the tact switch on a rear side of a switch operating part of a rubber cover, avoid the tact switch and approach or are abutted on a circuit board integrally with the rubber cover. SOLUTION: At a location opposite to a tact switch 3 on a circuit board 4 of a rubber cover 12, a switch pressing operating part 13 of a substantial crown shape in cross section is formed integrally with the rubber cover 12. At a location approaching the switch pressing operating part 13, ribs for adjusting operation load 14A which avoid the tact switch 3 and are symmetrically located across the tact switch 3 are formed integrally with the rubber cover 12. The ribs for adjusting operation load 14A adjust pressing load to the tact switch 3 when the tact switch 3 is pressed via the switch pressing operating part 13 to proper quantity by adjusting thickness and lengths of the ribs 14A.
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