Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-10-20
1996-07-02
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
25055917, 250229, H01J 314
Patent
active
055324738
ABSTRACT:
A reflective shadow sensor is disclosed for use in detecting the position of a moving object by directing a flow of light towards that object and detecting the amount of light reflected by a surface of the moving object.
REFERENCES:
patent: 5172003 (1992-12-01), Nasu et al.
patent: 5376785 (1994-12-01), Chin
patent: 5389777 (1995-02-01), Chin
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