Image projection system

Details Image projection system Image projection system

1987-02-24

1988-08-23

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 64, H04N 574

Patent

active

047664983

ABSTRACT:
An image projection system has at least one display tube provided with an interference filter for increasing the amount of light which is emitted within a small solid angle. Each display tube is combined with a projection lens system having a first lens element of positive power with an aspherical surface at the image end and a convex aspherical surface at the object end, which surface has a center of curvature in the image end half. A second lens element of negative power has a concave surface facing the image end, which is toward the first element, and an opposed surface which conforms to the display window of the display tube. A third lens element which is bi-convex may be located between first and second lens elements. The pupil of the lens system is located in the image end half of the first element. The brightness of the picture on a projection screen is enhanced while the brightness variation and the color shading of this picture are reduced.

REFERENCES:
patent: 800085 (1974-03-01), Ambats
patent: 4423438 (1983-12-01), Nakamura
patent: 4672458 (1987-06-01), Mckechnie

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