Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1991-02-13
1992-02-18
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2503381, 250353, G01J 508, G01J 504
Patent
active
050897055
ABSTRACT:
An infrared detector is capable of preventing faulty detection attributable to stray infrared rays. The infrared detector comprises an outer cylinder having an inner surface coated with a black film, an inner cylinder having an outer surface coated with a multilayer film capable of suppressing reflection, and an infrared sensing element mounted on the inner cylinder. The combined effect of the black film and the multilayer film prevents the incidence of stray infrared rays, namely, infrared rays scattered by multiple reflection, at the infrared sensing element. The infrared detector can be provided with a plurality of infrared sensing elements to detect infrared rays of frequencies in different frequency bands by providing band-pass filters each having an optical aperture in combination respectively with the infrared sensing elements.
REFERENCES:
patent: 4443303 (1984-04-01), Freeman
patent: 4795907 (1989-01-01), Maekawa et al.
patent: 4937450 (1990-06-01), Wakabayashi et al.
patent: 4990782 (1991-02-01), Wellman et al.
Hamashima Shigeki
Hirota Koji
Hukuda Hirokazu
Itoh Makoto
Ueda Satoshi
Fujitsu Limited
Hannaher Constantine
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