Capacitive multikey keyboard for inputting data into a computer

Details Capacitive multikey keyboard for inputting data into a computer Capacitive multikey keyboard for inputting data into a computer

1983-01-14

1986-10-07

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340365S, 178 17C, G06F 302

Patent

active

046162135

ABSTRACT:
A multikey keyboard for inputting data into a computer, wherein pressing a key places in circuit the point of intersection of a row conductor and column conductor respectively connected to portions of separate row and column sequential series of capacitors whose cumulative capacitance correspond to the specific row and columns of the pressed key, thus allowing the computer to establish which key was pressed by measuring the capacitance between the events involving said completed keyboard circuits.

REFERENCES:
patent: 4078257 (1978-03-01), Bagley
patent: 4305065 (1981-12-01), Mogi
patent: 4415781 (1983-11-01), Frame
patent: 4429301 (1984-01-01), Crumley
patent: 4495485 (1985-01-01), Smith
patent: 4555693 (1985-11-01), Danish
IBM Technical Disclosure Bulletin, Holt, vol. 14, No. 8, Jan. 1972, p. 2277.

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