Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1997-12-08
1999-11-16
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
25055938, H01J 4014
Patent
active
059862556
ABSTRACT:
A photoelectric cell which detects a distance of an object, including: a first detection component configured to produce a first current which is a function of the distance of the object; a second detection component configured to produce a second current which is a function of the distance of the object; and, a processing circuit configured to shape a first voltage signal and a second voltage signal that correspond to the first current and second current, respectively. The processing circuit includes a main comparator configured to determine whether the distance of the object is greater or less than a detection range of said photoelectric cell by comparing the first voltage signal and the second voltage signal and to output a switching signal indicative of whether the distance of the object is greater or less than the detection range, and, a locking comparator configured to maintain the switching signal in an inactive state when the first voltage signal is less than a set-point voltage which corresponds to a detection distance greater than the detection range.
REFERENCES:
patent: 4288152 (1981-09-01), Matsuda
patent: 4849781 (1989-07-01), Nakazawa et al.
patent: 5157435 (1992-10-01), Min et al.
Patent Abstracts of Japan, vol. 11, No. 32, (P-541), Jan. 30, 1987 and JP 61 201223 A , Sept. 5, 1986.
Patent Abstracts of Japan, vol. 9, No. 334, (P-417), Dec. 27, 1985 and JP 60 157011 A, Aug. 17, 1985.
Patent Abstracts of Japan, vol. 11, No. 137, (P-572), May 2, 1987 and JP 61 277009 A, Dec. 8, 1986.
Patent Abstracts of Japan, vol. 9, No. 105, (P-354), May 9, 1985 and JP 59 228108 A, Dec. 21, 1984.
Charrier Pierre
Guillot Alain
Le Que T.
Schneider Electric SA
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