Patent ID: 7094985

Claim:
A housing body provided with a plurality of concave sections on an outer surface of said housing body; a switch button sheet provided on said outer surface of said housing body to cover said plurality of concave sections; a conductor having a dome shape downwardly projecting and provided in each of said plurality of concave sections to contact said switch button sheet; and a cover sheet provided between said switch button sheet and said outer surface of said housing body in a portion of said outer surface of said housing body other than said plurality of concave sections to cover a lower surface of said conductor in each of said plurality of concave sections; wherein said switch button sheet comprises: a first electrode provided on a lower surface of said switch button sheet apart from said conductor; and a second electrode provided on the lower surface of said switch button sheet to connect with an end of said conductor, wherein when said switch button sheet corresponding to said concave section is pushed, said conductor contacts said first electrode; and wherein said switch button sheet has an extending portion and a blanked portion which has an arc shape to surround said first and second electrodes.