Projection display system

Details Projection display system Projection display system

1995-09-29

1997-09-02

Dowling, William

Optics: image projectors

Composite projected image

Multicolor picture

353 33, 353102, G03B 2114

Patent

active

056624000

ABSTRACT:
Disclosed is a condenser lens with large aperture, having a numerical aperture of 0.9 or larger, which consists of a bi-aspherical single lens having a first surface of convex form facing the larger conjugate side and a second surface facing the smaller conjugate side and whose outermost circular zone is formed concave, the condenser lens satisfying the following conditions (1) or (2). Also disclosed are a light source apparatus using such a condenser lens and a projection display apparatus using such a light source apparatus.
(1) 0.42<r1
f<0.45 18<.vertline.r2
f.vertline. -0.39<K1<-0.25 0.11<.DELTA.2/f<0.14
(2) 0.4<r1
f<0.6 -0.5<r2
f<-0.3 -0.6<K1<-0.2 -0.1<SG2/f<0.1
where

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