Key input apparatus with light-shielding plates and liquid cryst

Details Key input apparatus with light-shielding plates and liquid cryst Key input apparatus with light-shielding plates and liquid cryst

1990-01-03

1991-07-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

341 31, G01D 534

Patent

active

050361910

ABSTRACT:
A key input apparatus includes a light beam source, a plurality of input keys operable for varying the color of a light beam or intercepting a group or groups of light beams, an optical detector for detecting variations in the color of the light beam or interception of the group or groups of light beams, and a circuit for identifying operated keys based on outputs of the optical detector.

REFERENCES:
patent: 3519116 (1970-07-01), Koehn
patent: 3904870 (1975-09-01), Stauffer
patent: 4442425 (1984-04-01), Eibner

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