Keyboard assembly

Details Keyboard assembly Keyboard assembly

H - Electricity

03

M

340/187

H03M 11/00 (2006.01) H01H 13/52 (2006.01) H01H 13/70 (2006.01)

Patent

CA 1242507

ABSTRACT A keyboard assembly including a plurality of key operated switches, each of which includes a dome associated with contacts on a printed circuit board which when triggered upon being subjected to a triggering force closes the switch and upon being released opens the switch and a keycap or push button for operating the dome and a transmission system for transmitting a force from the keycap to the dome which includes an actuator extending from the keycap and a conically shaped helical spring between the actuator and the dome with the small end of the spring in working engagement with the dome. The underside of the dome is vented to the atmosphere through a vent in the printed circuit board which is sealed against contamination of dust by a perforated adhesive backed plastic film or sheet over the underside of the printed circuit board.

454212

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