Keyboard switch

Details Keyboard switch Keyboard switch

1977-05-16

1979-01-02

Sewell, Paul T.

Typewriting machines

Key-board or key lever-actuating mechanism

Including means generating a signal for type selecting or...

178 17C, 200 1B, 340365C, B41J 508

Patent

active

041324870

ABSTRACT:
This invention relates to a keyboard switch or push button transducer for use in keyboards which makes use of the advantages of resistive and capacitive methods of closure. The switch element is comprised of a resilient conductive element attached to a pad of compressible foam mounted on the end of a key plunger. When the push button or switch plunger is depressed, the switch element is brought into contact with conductive elements etched on a printed circuit board. One of the conductive elements has a coating of dielectric material thereon, and the other conductive element has a raised conductive surface to contact the conductive elastomer sheet prior to the contact with the dielectric material. The insulated area forms a capacitance between the elastomer sheet and the conductive element or metallic pad on the printed circuit board, and the other area of conductor element, being uninsulated, makes a resistive contact with the elastomer. This forms a series resistance capacitance switch capable of passing pulsed signals therethrough.

REFERENCES:
patent: 2360128 (1944-10-01), Hausler
patent: 3797630 (1974-03-01), Zilkha
patent: 3951250 (1976-04-01), Pointon et al.
patent: 3965399 (1976-06-01), Walker et al.

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