Optics: image projectors – Particular condenser
Patent
1998-02-18
2000-10-31
Dowling, William
Optics: image projectors
Particular condenser
353 20, 353122, G03B 2114
Patent
active
061391573
ABSTRACT:
An illuminating apparatus includes an inner surface reflection type integrator, a condensing optical system for condensing light from a light source on or near the light incidence portion of the integrator, and an imaging optical system for imaging the light emergence portion of the integrator or the vicinity thereof on a surface to be illuminating. The integrator reflects at least part of light which has entered the interior thereof from the light incidence portion thereof by the inner surface thereof to thereby propagate it to the light emergence portion thereof, thereby forming light of which the intensity distribution has been uniformized on or near the light emergence portion. The imaging optical system has a polarizing beam splitter for dividing the light from the integrator into a plurality of polarized lights differing in the direction of polarization from one another. In addition, a changing member changes the direction of polarization of at least one of the plurality of polarized lights to thereby bring the directions of polarization of the plurality of polarized lights into coincidence with one another, the plurality of polarized lights having had their directions of polarization brought into coincidence with one another being caused to enter the surface to be illuminated.
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Canon Kabushiki Kaisha
Dowling William
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