Capacitive key for keyboard

Details Capacitive key for keyboard Capacitive key for keyboard

1976-09-30

1978-05-16

Goldberg, E. A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

361278, 428597, H01G 516, H01G 518

Patent

active

040902293

ABSTRACT:
In a capacitive key for use in a keyboard, an operator depresses a plunger which alters the separation between the plates of a capacitor, thereby altering its capacitance. It is desirable to provide plunger overtravel which permits further depression of the plunger after the capacitor has been altered. In the present invention a portion of the movable capacitor plate is formed into a spring which elastically deforms after the capacitor has been altered, to permit overtravel of the plunger.

REFERENCES:
patent: 2700079 (1955-01-01), Haydow
patent: 3196233 (1965-07-01), Burch
patent: 3800104 (1974-03-01), Lien
patent: 3852870 (1974-12-01), Elliott

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