Illumination system for use in image projection apparatus

Details Illumination system for use in image projection apparatus Illumination system for use in image projection apparatus

1990-03-15

1991-09-10

Cuchlinski, Jr., William A.

Optics: image projectors

Lens support

Lens position adjustable

353 85, 362331, 362335, 362268, 362277, 359689, 359676, 359742, G03B 302, F21V 504

Patent

active

050468383

ABSTRACT:
An illumination system for use in an image projection apparatus, having a light source assembly which includes a lamp and a concave reflector for producing convergent light, and an illumination lens group which includes, in order from the light source assembly side, a first lens unit of a negative power, a second lens unit of a positive power movable along the optical axis and a third lens unit of a positive power. The illumination lens group fulfills the following equation,

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