Two dimensional light beam selection system

Details Two dimensional light beam selection system Two dimensional light beam selection system

1977-09-22

1980-05-27

Jordan, Charles T.

Communications: electrical

Audible indication

Percussion-type sound producer

176 19EC, 176 24, 178 18, 340707, G28C 100, G21C 700, G08C 2100

Patent

active

042053048

ABSTRACT:
A position selection system comprising a map of a plurality of selection positions arranged in columns and rows with a normally unenergized light emitter and a respective normally disabled light detector positioned at opposie ends of each of the columns and rows. The light emitters are sequentially energized and the respective light detectors are synchronously sequentially enabled to thereby avoid the necessity of collimating light from the light emitters.

REFERENCES:
patent: 3128340 (1964-04-01), Harmon
patent: 3478220 (1969-11-01), Milroy
patent: 3495232 (1970-02-01), Wagner
patent: 3613066 (1971-10-01), Cooreman
patent: 3653031 (1972-03-01), Hlady
patent: 3962698 (1976-06-01), Hunt
patent: 4022969 (1977-05-01), McKinlay
IEEE, Spectrum, Nov. 1976, p. 70.

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