Illumination optical system, projection optical system and displ

Details Illumination optical system, projection optical system and displ Illumination optical system, projection optical system and displ

1996-09-13

1999-04-27

Dowling, William

Optics: image projectors

Composite projected image

Multicolor picture

353 34, 353 84, 349 8, G03B 2100

Patent

active

058971904

ABSTRACT:
This invention provide an image display apparatus having an illumination optical system for effectively illuminating a plurality of areas on a single common plane uniformly by shortening optical paths of the optical system and a new projection optical system capable of reducing the overall size of the optical system and a production cost thereof. The illumination optical system has an ellipse mirror for collecting light beams generated from a light source, a first lens group for suppressing divergence of the light beams reflected from a light collecting area of the ellipse mirror, a plural color filters for separating the light beams into three color light beams and altering a path of each of the three color light beams, and a second lens group for illuminating objects disposed on the single common plane by focusing the separated three color light beams thereon.

REFERENCES:
patent: 5264880 (1993-11-01), Sprague et al.
patent: 5467206 (1995-11-01), Loiseaux et al.
patent: 5555041 (1996-09-01), Manabe
patent: 5623348 (1997-04-01), Ogino
patent: 5633737 (1997-05-01), Tanaka et al.
patent: 5719706 (1998-02-01), Masumoto et al.
patent: 5737040 (1998-04-01), Ichikawa et al.
patent: 5738429 (1998-04-01), Tagawa et al.

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