Optical low pass filter for a solid state color camera

Details Optical low pass filter for a solid state color camera Optical low pass filter for a solid state color camera

H - Electricity

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H01L 31/02 (2006.01) G02B 5/30 (2006.01) G02B 27/28 (2006.01) G02B 27/46 (2006.01) H01L 31/0216 (2006.01) H04N 9/04 (2006.01) H04N 9/30 (2006.01)

Patent

CA 1271069

ABSTRACT OF THE DISCLOSURE An optical filter for use in a solid state color camera containing a plurality of solid state image sensing devices, the filter including a first crystal plate for separating an incident ray into an ordinary ray and extraordinary rays in a direction of 45° with respect to the horizontal scanning direction of said solid state image sensing devices, a second crystal plate for separating the incident ray thereof into an ordinary ray and extraordinary rays in a direction which coincides with the horizontal scanning direction, and a third crystal plate for separating the incident ray into an ordinary ray and extraordinary ray in a direction of -45° with respect to the horizontal scanning direction. The second crystal plate is located between the first and third crystal plates, and the three plates are bonded together in the form of a laminate. The optical filter thus produced provides a point diffusion for an incident ray to direct the diffused rays on the solid state image sensing devices. The optical filter then forms first and second trap straight lines and a third trap straight line extending along the vertical scanning direction of the solid state image sensing devices for distributing a spatial frequency spectrum of a sampled output from the solid state image sensing device.

509932

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