Optical keyboard having a plurality of pivotal light obstructing

Details Optical keyboard having a plurality of pivotal light obstructing Optical keyboard having a plurality of pivotal light obstructing

1977-03-14

1979-05-01

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

178 17D, 250221, G06F 302

Patent

active

041526996

ABSTRACT:
A plurality of optical transmission tracts direct radiant energy from an appropriate light source to each of a plurality of photo-transistors or other light sensitive elements. The photo-transistors are adapted to generate an output signal whenever the radiant energy impinging thereon exceeds a threshold value which distinguishes environmental radiation from the radiant energy generated by the light source. A plurality of code bars, each representative of a different character code, are provided. Each code bar includes a hinged rail pivotally coupled to the housing and a plurality of radiant energy interrupting code projections depending therefrom. The number and location of the plurality of radiant energy interrupting code projections depending from each hinged rail is determined by the character code associated with the code bar of which they form a part. Each code bar is movable from a first position wherein its radiant energy interrupting code projections do not block the transmission of radiant energy from the light source to the photo-transistors, to a second position wherein the radiant energy interrupting code projections do block the transmission of radiant energy from the light source to selected photo-transistors. The movement of each code bar is controlled by a different, independently operable, push-button.

REFERENCES:
patent: 3579047 (1971-05-01), Sturm et al.
patent: 3609713 (1971-09-01), Wooton et al.
patent: 3612240 (1971-10-01), Parker
patent: 3617627 (1971-11-01), McLean
patent: 3767022 (1973-10-01), Olson
patent: 3818485 (1974-06-01), Harrison

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