Photosensor assembly

Details Photosensor assembly Photosensor assembly

1978-03-27

1980-05-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, H01J 314

Patent

active

042019109

ABSTRACT:
A photosensor system includes a housing in which are defined a primary passage, and a secondary passage intersecting the primary passage at substantially a right angle. A light source is disposed in the secondary passage to direct light toward the intersection of the passages, and a beam splitter plate is disposed at the intersection at about a 45.degree. angle with the primary passage to direct light from the light source toward one end of the primary passage. Disposed in that end of the primary passage is a lens for collimating the light rays and directing them outwardly of the housing. One side of the beam splitter plate contains a reflective finish or surface to reflect light impinging thereon, and the plate includes an aperture therein for allowing the passage of light. When light directed outwardly by the lens encounters a retroreflector, some of the light is reflected back through the lens and through the aperture in the beam splitter plate toward the other end of the primary passage. Disposed at the other end of the primary passage is a phototransistor for producing a signal in response to light impinging thereon.

REFERENCES:
patent: 3456997 (1969-07-01), Stites et al.
patent: 3523191 (1970-08-01), Street
patent: 3740562 (1973-06-01), Fertig
patent: 3816745 (1974-06-01), Primm et al.

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