Optical low-pass filter

Details Optical low-pass filter Optical low-pass filter

1993-07-27

1995-09-19

Shafer, Ricky D.

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

359498, 348290, 348335, G02B 530, H04N 904

Patent

active

054521297

ABSTRACT:
A video camera equipped with an optical low-pass filter, which is to be arranged in front of a solid state imaging device. The optical low-pass filter comprises: a first sub-refractive plate adapted to separate an incident ray of light by a separation distance of d.sub.1 in a direction deviated 45.degree. clockwise or counterclockwise with respect to the horizontal scanning direction of the solid state imaging device; a second sub-refractive plate adapted to separate an incident ray of light by a separation distance of d.sub.2 in a direction parallel to the horizontal scanning direction of the solid state imaging device; and a third sub-refractive plate adapted to separate an incident ray of light by a separation distance of d.sub.1 in a direction perpendicular to the direction of separation of the first sub-refractive plate; wherein the second sub-refractive plate is arranged between the first and third sub-refractive plates; and wherein the condition: d.sub.1 >2d.sub.2 is satisfied.

REFERENCES:
patent: 3588224 (1971-06-01), Pritchard
patent: 4227208 (1980-10-01), Takanashi et al.
patent: 4539584 (1985-09-01), Otake
patent: 4605956 (1986-08-01), Cok
patent: 4626897 (1986-12-01), Sato et al.
patent: 4761682 (1988-08-01), Asaida
patent: 4807981 (1989-02-01), Takizawa et al.
patent: 5029010 (1991-07-01), Shiraishi

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