Photo sensing device with means to eliminate light beam interfer

Details Photo sensing device with means to eliminate light beam interfer Photo sensing device with means to eliminate light beam interfer

1998-08-13

2000-10-03

Ham, Seungsook

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, G01D 534

Patent

active

061276766

ABSTRACT:
An improved photo sensing device is provided that includes at lest one light source, at least one photo detector and an optical chopper. A cone-shaped surface, or two or four inclined planes are provided on the periphery of the detector to eliminate interference from the work beam impinging upon the photo detector. By that arrangement, the photo sensor is not influenced by scattered light.

REFERENCES:
patent: 5969344 (1999-10-01), Tseng

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