Optical low-pass filter including three crystal plates for a sol

Details Optical low-pass filter including three crystal plates for a sol Optical low-pass filter including three crystal plates for a sol

1986-05-27

1988-08-02

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, 358 55, 350404, H04N 9097, H04N 904, G02B 2728

Patent

active

047616822

ABSTRACT:
An optical filter for use in a solid state color camera containing a plurality of solid state image sensing devices having a predetermined horizontal scanning direction, the filter including a first crystal plate for separating an incident ray into an ordinary ray and extraordinary rays in a direction of 45.degree. 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.degree. 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 sensing device.

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