Patent ID: 7230197

Claim:
A movable contact made of resilient and electrically conductive thin metal plate of which a central section is turned over by depressing a top of the movable contact, the movable contact being shaped like a dome bowing upward and open downward, and comprising: projections placed at least at three places radially at a center where turn-over occurs, and a top view of the projections shows each of the projections having a long and narrow shape extending along a radial direction, and the projections each protrude downward, wherein a downward protruding amount of each one of the projections is set such that each of the projections protrudes in a greater amount along the radial direction from the center to an outer side, and each one of the projections includes a flat face having a given width along a circumferential direction, and wherein during operation of the movable contact, the projections touch an object at an outer section of the flat face along the circumferential direction.