Matrix keyboard

Details Matrix keyboard Matrix keyboard

1983-01-14

1986-01-28

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

200 5A, 340365R, 340365C, G06F 302

Patent

active

045674698

ABSTRACT:
In an improved multikey keyboard for inputting data into a computer, wherein pressing a key places in circuit the point of intersection of at least one row conductor and column conductor respectively connected to portions of separate sets of row and column cascaded electrical elements whose cumulative values correspond to the specific row and column of the pressed key, the specific improvement comprising: providing the keyboard with an input signal source circuit and an output sensor circuit operatively connected to each key such that the computer upon receipt of a signal on the sensor circuit representing the pressing of a key, can make the necessary measurements to establish the identity of the pressed key.

REFERENCES:
patent: 4305065 (1981-12-01), Mogi
patent: 4429301 (1984-01-01), Crumley
patent: 4471177 (1984-09-01), Doughty
patent: 4495485 (1985-01-01), Smith
IBM Technical Disclosure Bulletin, Holt, vol. 14, No. 8, Jan. 1972, p. 2277.

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