Tilted light detection device for preventing undesirable retro-r

Details Tilted light detection device for preventing undesirable retro-r Tilted light detection device for preventing undesirable retro-r

1993-03-05

1994-10-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

369 4424, H01J 314

Patent

active

053571029

ABSTRACT:
A light detection device includes a lens, a photodetector, positioned tilted at a prescribed angle to an incident beam axis, for detecting the incident beam which is incident passing through the lens, and a mask for shading a light reflected by the photo-detector to prevent from returning the reflected light in the direction of the incident beam.

REFERENCES:
patent: 4532619 (1985-07-01), Sugiyama et al.
patent: 5018804 (1991-05-01), Jung et al.
patent: 5048783 (1992-01-01), Dewey et al.
patent: 5126988 (1992-06-01), Nishiguma et al.

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