Motion detector with two-sided PIR sensor in refractive arrangem

Details Motion detector with two-sided PIR sensor in refractive arrangem Motion detector with two-sided PIR sensor in refractive arrangem

1994-01-12

1995-01-10

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250DIG1, G01J 508

Patent

active

053810112

ABSTRACT:
A passive infrared motion detector with a 360.degree. field of view. The motion detector includes an integrated-circuit infrared sensor package containing an infra-red sensor having one or more sensing elements. The integrated-circuit sensor package is provided with viewing windows on both sides and the sensing elements are mounted within the integrated-circuit package so that both sides of the sensing elements are able to receive infrared radiation through the viewing windows from the areas in front of and behind the integrated-circuit package. The motion detector includes infrared-refracting means that are disposed with respect to the front and rear surfaces of the sensing elements so as to direct radiation to the surfaces from lateral areas on both sides of the integrated-circuit package. The infrared refracting means are positioned to leave at least a portion of the surfaces on both sides of the sensing elements unobstructed for receiving infrared radiation directed at the respective unobstructed portions from the frontal and rear regions of the field of view. A focusing means is provided to direct infra-red radiation from a plurality of zones in the frontal and rear regions of the field of view directly to the unobstructed portions of the sensing elements and from a plurality of zones in both lateral regions of the field of view to the refracting means for refraction to the sensing elements.

REFERENCES:
patent: 5124546 (1992-06-01), Hu
patent: 5200624 (1993-04-01), Pederson, Jr. et al.
patent: 5308985 (1994-05-01), Lee

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