Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-07-28
1998-11-10
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250216, 359204, 347243, H01J 314
Patent
active
058347666
ABSTRACT:
A two-beam detection method causes two beams to differ in light intensity and converging the two beams to enter a common photosensitive element, a photoreception surface of the photosensitive element being configured such that the two beams differ in time required to pass the photoreception surface, processes an output from the photosensitive element using a plurality of threshold levels so as to obtain rectangular signals, one of the rectangular signals obtained using one of the plurality of threshold levels being designated as a detection signal for one of the two beams, and performs a predetermined calculation on the rectangular signals so as to obtain a detection signal for the other of the two beams.
REFERENCES:
patent: 5017768 (1991-05-01), Takagi
Le Que
Ricoh & Company, Ltd.
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