Capacitive keyswitch with overtravel mechanism on moveable...

Details Capacitive keyswitch with overtravel mechanism on moveable... Capacitive keyswitch with overtravel mechanism on moveable...

G - Physics

08

B

340/178

G08B 1/08 (2006.01) H01H 13/20 (2006.01) H03K 17/975 (2006.01)

Patent

CA 1165423

Case 3796 CAPACITIVE KEYSWITCH WITH OVERTRAVEL MECHANISM ON MOVEABLE PLATE Abstract of the Disclosure A capacitive keyswitch is formed with a fixed horizontal plate that is imbedded in a horizontal printed circuit board below an overslaying dielectric layer and a moveable cantilever mounted plate that is hinged to the printed circuit board so as to project upwardly at an acute angle. When a plunger is actuated, a portion of it presses down on an overtravel mechanism that is formed from the moveable plate which causes the moveable plate to assume approximately a parallel position with respect to fixed horizontal plate, thereby changing the capacitance of the switch and actuating the switch. The overtravel mechanism consists of a tab cut out of a bent-up portion of the moveable plate so that the tab is bent along an intersection line formed by the intersection of the plane or moveable plate and the plane of the bent-up section.

390661

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