Electronic apparatus push button keyboard assembly

Details Electronic apparatus push button keyboard assembly Electronic apparatus push button keyboard assembly

1977-06-06

1980-01-29

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

200 5A, 606F 302

Patent

active

041863852

ABSTRACT:
A simplified keyboard input assembly particularly suited for use with a miniaturized electronic calculator or combination electronic calculator-wristwatch is provided. The keyboard input assembly is particularly characterized by a plurality of manually operated switches formed in two groups and a plurality of logic gates corresponding to each of the manually operated switches, the logic gates being disposed in two groups. A first input of each of the logic gates in a first group of logic gates is coupled to the manually operated switches in a first group, and a first input of each of the logic gates in the second group of logic gates is coupled to the manually operated switches in the second group of manually operated switches. A second input of each of the logic gates in the first group of logic gates is coupled to a second input of a logic gate in the second group of logic gates and is further coupled to a manually operated switch in the first group of manually operated switches and a manually operated switch in the second group of manually operated switches so that the actuation of each of the manually operated switches will coincidentally energize the first and second inputs of one of said logic gates corresponding thereto and thereby produce a predetermined input signal.

REFERENCES:
patent: 3715746 (1973-02-01), Hatano et al.
patent: 3717871 (1973-02-01), Hatano et al.
patent: 3721976 (1973-03-01), Kuijsten
patent: 3818441 (1974-06-01), Nomiya et al.
patent: 4064399 (1977-12-01), Muranaka

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