Optical low pass filter

Details Optical low pass filter Optical low pass filter

G - Physics

02

B

88/114

G02B 27/46 (2006.01) H04N 9/04 (2006.01) H04N 9/07 (2006.01)

Patent

CA 1271067

ABSTRACT OF THE DISCLOSURE An optical low pass filter used in a video camera having a solid state image sensing device and a color separating filter is disclosed, which includes a first double refraction plate being arranged to separate an incident light ray to an ordinary light ray and an extraordinary light ray which is displaced from the ordinary light ray by a distance d in a direction with the angle substantially equal to .theta. relative to the horizontal scanning direction of the solid state image sensing device, wherein cos 2.theta.=? (0°<2.theta.<90°), and a second double refraction plate being arranged to separate an incident light ray to an ordinary light ray and an extraordinary light ray which is displaced from the ordinary light ray by a dis- tance d in a direction with the angle substantially equal to -.theta. relative to the horizontal scanning direction of the solid state image sensing device, whereby the optical low pass filter has the spatial frequency characteristic having a first trap frequency u1 and a second trap frequency 2u1.

490065

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