Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-11-07
1997-10-14
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250239, 250353, G01V 904, G01J 508
Patent
active
056775296
ABSTRACT:
A device for receiving light beams, especially a PIR movement detector, includes a housing having at least one window in which lens segments, preferably Fresnel lenses, are disposed in such a way that horizontally incident light beams are focused as direct horizontal beams onto two light sensors. The two light sensors are mutually disposed in such a way that a usable sensor detection angle of the two light sensors is defined. In order to achieve an enlargement of the detection angle, at least one horizontal reflector is disposed in the vicinity of at least one of the light sensors, in such a way that the horizontal reflector detects further light beams from a horizontal angular region not covered by the light sensors with the usable detection angle, and these beams reach at least one of the light sensors as reflected horizontal beams. The lens segments surround the light sensors having the at least one horizontal reflector in a curve-shape to such an extent that they also focus horizontal beams which are incident outside the usable sensor detection angle.
REFERENCES:
patent: 4081680 (1978-03-01), Keller
patent: 4644147 (1987-02-01), Zublin
patent: 4876445 (1989-10-01), McMaster
patent: 5107120 (1992-04-01), Tom
patent: 5266807 (1993-11-01), Neiger
patent: 5308985 (1994-05-01), Lee
patent: 5317620 (1994-05-01), Smith
patent: 5393978 (1995-02-01), Schwarz
patent: 5406083 (1995-04-01), Sandell et al.
patent: 5414255 (1995-05-01), Hampson
Blomberg Lothar
Hofmann Gunter
Lang Jens-Olaf
Norkus Volkmar
Rosch Rainer
ABB Patent GmbH
Allen Stephone
Greenberg Laurence A.
Lerner Herbert L.
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