Patent ID: 7235754

Claim:
A switch device comprising a casing ( 3 ) which has a bottom wall ( 9 ), a dome-like member ( 51 ) with a dome periphery ( 57 ) supported over said bottom wall and with a dome center part ( 55 ), a conductive pad ( 21 ) lying on said bottom wall under said dome center part, and an operation element ( 5 ) which is depressable to downwardly deflect the dome center part ( 55 ) against the conductive pad ( 21 ) including: an insulating block ( 61 ) of elastomer material which lies between the operation element ( 5 ) and the dome center part ( 55 ) and which has a lower end that is sufficiently narrow to directly transmit downward forces to the dome center part but not to said dome periphery; said insulating block having top and bottom surfaces and having a concave outer surface.