Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent
1982-05-17
1984-07-03
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
340365C, H01G 514, B41J 508
Patent
active
044582935
ABSTRACT:
An improved capacitive keyboard includes a plurality of switch keys that each define a minimum capacitance when in a fully extended rest state and a maximum capacitance when pressed. Each switch key has a plunger mechanism that compresses a capacitive spring when the key is pressed and releases the spring when the key is released. Each capacitive spring is affixed in operational orientation over an associated capacitive pad by soldering areas of the base coil of the spring to adjacent plated holes in a supporting printed circuit board. In operation, molten solder is applied at the underside of the printed circuit board and passes up through the plated holes by capillary action to contact the base coil of the spring. The hardened solder holds the spring in its operational position on the printed circuit board and conductively contacts the spring with an output terminal of the board.
REFERENCES:
patent: 3653038 (1972-03-01), Webb et al.
patent: 3659163 (1972-04-01), Borisov et al.
patent: 3797630 (1974-03-01), Zilkha
patent: 4083100 (1978-04-01), Flint et al.
patent: 4209819 (1980-06-01), Seignemartin
I.B.M. Technical Disclosure Bulletin, vol. 24, No. 8, Jan. 1982, pp. 4014-4015.
Cherry Electrical Products Corporation
Griffin Donald A.
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