Optical selector switch and display apparatus

Details Optical selector switch and display apparatus Optical selector switch and display apparatus

1980-03-14

1982-06-08

Groody, James J.

Communications: electrical

Continuously variable indicating

Via radiant energy beam

250231SE, 340347P, 34087020, 34087019, G08C 1936, G08C 1916

Patent

active

043342221

ABSTRACT:
An optical pulse-forming switch includes a pair of spaced apart photodetectors and a rotatable shutter arranged to permit sequentially illuminating first one photodetector and then the other, depending on the sense of rotation, to produce out-of-phase pulse trains. The optical pulse-forming switch is interfaced with a pair of synchronized flip-flops and a phase detection counter control circuit which senses rotation extent and direction. The counter control circuit drives a counter that stores the number of passed angular increments and stores direction of rotation, the counter being interrogated and reset at regular time intervals. Thus, the input shaft rotation is converted into a digital quantity by maintaining a running summation of counter values. The operator reference indicator is accordingly brought up to date following each input conversion.

REFERENCES:
patent: 3728551 (1973-04-01), Culver et al.
patent: 3814934 (1974-06-01), Mesh et al.
patent: 4079251 (1978-03-01), Osann
patent: 4086580 (1978-04-01), Schroeder
patent: 4117320 (1978-09-01), Tomlinson et al.
patent: 4194184 (1980-03-01), Hartmann et al.

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