Integral infrared absorbing optical low-pass filter

Details Integral infrared absorbing optical low-pass filter Integral infrared absorbing optical low-pass filter

1995-05-31

1996-12-31

Garber, Wendy

Television

Camera, system and detail

Optics

359356, 359342, H04N 5225

Patent

active

055898823

ABSTRACT:
An optical low-pass filter includes an optical member formed of a material capable of absorbing light in a particular wavelength range, e.g., an infrared range. The optical member has a plurality of ridge-like portions formed on at least one surface thereof at a predetermined pitch. The ridge-like portions comprise a phase type diffraction grating which has a low-pass filtering effect with respect to bundles of optical transmission rays passing therethrough.

REFERENCES:
patent: 3940788 (1976-02-01), Abe et al.
patent: 4068260 (1978-01-01), Ohneda et al.
patent: 4105289 (1978-08-01), Hershel
patent: 4178611 (1979-12-01), Okano
patent: 4477148 (1984-10-01), Tsuji et al.
patent: 4659178 (1987-04-01), Kyogoku
patent: 4763966 (1988-08-01), Suzuki et al.
patent: 4807981 (1989-02-01), Takizawa et al.

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