Optical low-pass filter.

摘要

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 d1 in a direction deviated 45 DEG 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 d2 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 d1 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: d1 > 2ROOT 2d2 is satisfied. <IMAGE>