Key input device

Details Key input device Key input device

1987-10-20

1989-10-03

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 22, 200 5R, H03M 1100

Patent

active

048720089

ABSTRACT:
In a key input device, the depression of any one of the keys of a keyboard applies a voltage to an analog-digital conversion input terminal and to one of a plurality of ordinary input terminals so that in accordance with the resulting analog-digital input terminal voltage and ordinary input terminal voltage, a microcomputer discriminates the depressed key.

REFERENCES:
patent: 4429301 (1984-01-01), Crumley et al.
patent: 4544924 (1985-10-01), French
patent: 4581603 (1986-04-01), Ingold et al.
patent: 4583189 (1986-04-01), Koyama
patent: 4725816 (1988-02-01), Petterson
patent: 4736190 (1988-04-01), Fiorella

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