Low profile keyboard switch

Details Low profile keyboard switch Low profile keyboard switch

1982-02-16

1983-10-04

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

200159B, 340365C, 4004791, H01G 516, H01H 312

Patent

active

044082525

ABSTRACT:
A capacitance keyboard switch is provided which is of substantially reduced vertical dimensions for reducing in a keyboard the overall space requirements therefore. The switch of the invention has an overall height of only 0.750 inches (19.05 mm), and a length of travel of as much as 0.150 inches (3.81 mm). This is achieved by eliminating a housing for the switch altogether, utilizing a cooperating plunger-snap-in guide combination, and a single sheet movable capacitor plate which cooperates with a plate on the printed circuit board. In addition, the entire assembly is mounted and supported on the printed circuit board with the components snapped together without the use of separate hardware, such as screws or nuts.

REFERENCES:
patent: 3750113 (1973-07-01), Cencel
patent: 3917917 (1975-11-01), Murata
patent: 4090229 (1978-05-01), Cencel et al.
patent: 4300029 (1981-11-01), Maser
patent: 4307268 (1981-12-01), Harper
patent: 4325102 (1982-04-01), English
patent: 4357646 (1982-11-01), McVey et al.
patent: 4363942 (1982-12-01), Deeg et al.
Digitran's Capacitive Keyboard Pamphlet Furnished by Applicants.

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