Capacitive keyswitch with overtravel plunger mechanism

Details Capacitive keyswitch with overtravel plunger mechanism Capacitive keyswitch with overtravel plunger mechanism

G - Physics

06

F

340/178

G06F 3/023 (2006.01) H01H 13/20 (2006.01) H03K 17/975 (2006.01)

Patent

CA 1168730

Case 3795 CAPACITIVE KEYSWITCH WITH OVERTRAVEL PLUNGER MECHANISM Abstract of the Disclosure A capacitive keyswitch is formed by a flat, horizontal capacitor plate that is covered by a dielectric layer on a printed circuit board and a moveable capacitor plate that is secured to the printed circuit board by a pair of tabs and is hinged so that it projects upwardly at an acute angle with respect to the horizontal printed circuit board. The plastic plunger for actuating the switch is formed with an integrally molded cantilever overtravel arm, which preferably is formed as a segment of the circumference of a circle. The arm has an integral transversely projecting cylindrical rod at its end which contacts the moveable capacitor plate during actuation of the keyswitch.

390631

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