Multiple field-of-view optical system

Details Multiple field-of-view optical system Multiple field-of-view optical system

1982-03-01

1984-04-10

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250353, 340567, G01J 104

Patent

active

044423594

ABSTRACT:
Disclosed herein is a multiple field-of-view optical system which is adapted for use in electromagnetic radiation-responsive systems, e.g. in passive infrared intruder detection systems. The optical system features an array of optical wedges which are arranged and constructed to intercept radiation propagating toward an optical axis from a plurality of discrete fields of view and refract such radiation in a direction parallel to such axis. A reflective focusing element, preferably parabolic in shape and positioned on said axis, intercepts the radiation refracted by the wedge array and redirects it toward the reflector's focal point. According to a preferred embodiment, the reflective element and wedge array are mounted for relative movement to alter the direction of the various fields of view.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 4185891 (1980-01-01), Kaestner
patent: 4268752 (1981-05-01), Herwig et al.
patent: 4275303 (1981-06-01), Mudge
R. C. Guichard "Plastic Lens Used in Photoelectric Control" Control Engineering vol. 29, No. 3 (Feb. 1982) pp. 134-142.

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