Infrared condensing lenses

Details Infrared condensing lenses Infrared condensing lenses

G - Physics

02

B

88/99

G02B 3/00 (2006.01) B29D 11/00 (2006.01) G02B 1/00 (2006.01) G02B 1/04 (2006.01) G02B 13/14 (2006.01) G02B 19/00 (2006.01)

Patent

CA 1152789

ABSTRACT OF THE DISCLOSURE The infrared rays condensing lens for use in an infrared ray sensor or the like contains a Fresnel convex lens composed of a synthetic resin capable of transmitting infrared rays and a membrane or film for preventing the penetration of visible rays disposed on at least one of the surfaces thereof. The membrane or film is formed by spattering or vacuum evaporating an inorganic material capable of substantially interrupting visible rays and transmitting at least a portion of rays in the infrared range. The infrared rays condensing lens is transmissive of a large amount of the infrared ray transmission, and has a short focal length and a small transmittance of visible rays. It has advantages that it can be manufactured by simple manufacturing steps using cheap materials.

365575

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