Solid state image pick-up apparatus

Details Solid state image pick-up apparatus Solid state image pick-up apparatus

1990-02-20

1991-12-03

Lobo, Ian J.

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

358 50, 359885, H04N 904, H04N 9097, G02B 520, G02B 2728

Patent

active

050695304

ABSTRACT:
An apparatus for picking-up an optical image of object including a lens system for forming the optical image of object, an optical filter for suppressing moire fringes, a color separation system for separating the optical image into green, red and blue color images, and three solid state image sensors for receiving the green, red and blue color images, respectively. The optical filter having a first quartz plate for separating ordinary and extraordinary light rays from each other in a direction of +45.degree. with respect to the horizontal direction, a second quartz plate for separating ordinary and extraordinary light rays from each other in the horizontal scanning direction, and a third quartz plate for separating ordinary and extraordinary light rays from each other in a direction of -45.degree. with respect to the horizontal scanning direction. The optical filter has two trap points, one at a sampling frequency f.sub.s and the other near 1.5f.sub.s, but does not have a trap point wiithin a frequency range below f.sub.s, so that components near f.sub.s as well as at 2f.sub.s, 3f.sub.s, 4f.sub.s and 5f.sub.s can be suppressed to a large extent, while the suppression for components in the base band can be limited effectively.

REFERENCES:
patent: 4761682 (1988-08-01), Asaida

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