Color picture projection system

Details Color picture projection system Color picture projection system

1981-08-13

1984-06-12

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

350317, 353 84, H04N 931

Patent

active

044545355

ABSTRACT:
A color picture projection system having a color picture light source and a lens system for magnifying the picture to project the same on a screen is provided with an optical filter for removing the effect of chromatic aberration. The lens system has a simple structure, for instance, two parallel lenses, each designed to pass a given wavelength. In a first embodiment, an annular optical filter partially blocks red and blue light rays incident on one side thereof. In a second embodiment, two coaxial annular optical filters are combined in a single filter to partially block the red light rays incident on a first portion thereof and to partially block red and blue rays incident on a second portion which is outside the first portion.

REFERENCES:
patent: 2837087 (1958-06-01), Sawyer
patent: 3470310 (1969-09-01), Shashoua
patent: 3549238 (1970-12-01), Graser
patent: 3572900 (1971-03-01), Bouche
patent: 3821794 (1974-06-01), Yoneyama

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