| 摘要 |
Button holes 3 are formed in a front panel 2 . Buttons 4 are arranged in the button holes 3 , and a rib 7 convexly provided on the back surface of the front panel 2 surrounds the button holes 3 . A light transmitting rubber sheet 11 closes a space 30 surrounded by the rib 7 and is held between a circuit board 15 and the rib 7 . Contact portions 12 are provided on the rubber sheet 11 so as to be brought into contact with and separated from the circuit board 15 by the elastic force of the rubber sheet 11 . Light emitting elements 17 are mounted on the circuit board 15 so as to correspond to the buttons 4 , and are accommodated in accommodation concave portions 18 in the rubber sheet 11.
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