Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1985-11-29
1987-08-25
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250342, G01J 100
Patent
active
046894861
ABSTRACT:
A folded modular optical system adapted for use, for example, in a passive infrared intruder detection device for directing radiation from a plurality of discrete fields of view onto a radiation-sensitive detector comprises an elongated rectangularly-shaped spherical reflector and a multifaceted reflective element. The latter comprises a plurality of elongated, generally parallel, planar reflectors which serve to direct radiation onto different portions of the spherical reflector. To minimize the effects of spherical aberration, the planar reflectors are arranged so that the portions of the spherical reflector which they irradiate are substantially perpendicular to the longer dimension of the rectangularly-shaped spherical reflector. Preferably, each of the planar reflectors is canted relative to the others so that its field of view is substantially co-planar with those of the other planar reflectors. It is also preferred that the planar reflectors vary in size and, hence, light-gathering power as a function of the intended range of protection they provide.
REFERENCES:
patent: 4258255 (1981-03-01), Guscott
patent: 4271360 (1981-06-01), Ward
patent: 4551711 (1985-11-01), Akiyama et al.
Detection Systems Inc.
Howell Janice A.
Kurz Warren W.
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