Projection lens system for a video projector

Details Projection lens system for a video projector Projection lens system for a video projector

1992-12-31

1994-12-13

LaRoche, Eugene R.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359629, 359649, 359650, 359651, 359665, G02B 300, H04N 931

Patent

active

053733940

ABSTRACT:
A projection lens system for a video projector for projecting a color image which is generated by combining red, green and blue images from an image source on a large screen. One lens element of a four lens optical lens system is disposed between an image-generating surface (or CRT) and an image combining unit for combining the images, and an oil chamber is provided by sealing the edges of the lens element and the image-generating surface. The flattening of the CRT's image-generating surface and a large aperture are attained by allowing the one lens to correct field curvature aberration and the other lenses to correct coma aberration. Separate cooling for respective CRTs enhances cooling devices efficiency and facilitates CRT movement adjustment for correcting chromatic aberration.

REFERENCES:
patent: 4950062 (1990-08-01), Kimura et al.
patent: 5066114 (1991-11-01), Hodges
patent: 5168351 (1992-12-01), Bradley et al.

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