Input device

Details Input device Input device

1982-07-13

1986-05-06

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340365R, 340365S, G09G 300

Patent

active

045875197

ABSTRACT:
An input device in use for electronic calculators with a segment type display section of a plurality of digits comprises a key switch matrix supplied with at least some of the signals applied to the segment of the display section, a latch circuit for detecting the key operation and latching the input signal representative thereof, a control section for detecting the required operation according to the input signal from the latch circuit for performing the required operation in accordance with the input signal and for producing a display signal, and a selector gate circuit which supplies the signal containing key-in detection pulse when the key operation is not detected to the segments and the key switch matrix, and sequentially supplies the key-in judging pulse to the key switches on the column lines of the key switch matrix when the key operation is detected.

REFERENCES:
patent: 3950743 (1976-04-01), Hatano et al.
patent: 3990070 (1976-11-01), Spence
patent: 4070664 (1978-01-01), Abe
patent: 4199751 (1980-04-01), Piguet
patent: 4242676 (1980-12-01), Piguet et al.
patent: 4277784 (1981-07-01), Hyltin
patent: 4454505 (1984-06-01), Harney et al.

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