Matrix keyboard with plurality of sequences of cascaded electric

Details Matrix keyboard with plurality of sequences of cascaded electric Matrix keyboard with plurality of sequences of cascaded electric

1983-01-14

1985-07-30

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, 34082579, G06F 302

Patent

active

045324972

ABSTRACT:
An improved multikey matrix keyboard for inputting data into a computer, wherein pressing a key places in circuit the point of intersection of a plurality of row conductors and a plurality of column conductors respectively connected to portions of separate sets of row and column sequential series of measurable electrical elements whose cumulative values correspond to the specific row and column of the pressed key. By employing a plurality of row and column key output circuits, the number of keys present in the matrix keyboard is exponentially increased.

REFERENCES:
patent: 4074261 (1978-02-01), Van der Gaag
patent: 4415781 (1983-11-01), Frame
patent: 4429301 (1984-01-01), Crumley

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