Optical apparatus

Details Optical apparatus Optical apparatus

1976-06-30

1978-11-28

Tokar, M.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 66, 350299, G01D 2104

Patent

active

041277716

ABSTRACT:
Optical apparatus for extending a light curtain, using a light beam shifted periodically laterally parallel to itself onto an array of plane mirrors at an angle to the beam, the span of the array normal to the emergent reflected beam being greater than its span normal to the incident beam.

REFERENCES:
patent: 2946253 (1960-07-01), Clark
patent: 2971695 (1961-02-01), Sick
patent: 3464133 (1969-09-01), DePoray
patent: 3514183 (1970-05-01), Rabedeau
patent: 3877802 (1975-04-01), Greenspan
patent: 4052120 (1977-10-01), Sick

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