Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1991-12-23
1993-08-17
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 53, 362268, G03B 2754, F21V 704
Patent
active
052373673
ABSTRACT:
An illuminating optical system comprises parallel light beam generating means for providing a parallel light beam, a first optical integrator for substantially forming a first planar light source by the light beam coming from the parallel light beam generating means, a first condensing optical system for condensing the light beam from the first planar light source, a second optical integrator for substantially forming a second planar light source by the light beam condensed by the first condensing optical system, and a second condensing optical system for illuminating an illuminated plane in overlapping manner by condensing the light beam from the second planar light source formed by the second optical integrator.
At least either of the first optical integrator and the first condensing optical system has a variable focal length, and the size of the second planar light source is rendered variable while the size of the illuminated area is maintained constant, through a change in the focal length.
REFERENCES:
patent: 4497015 (1985-01-01), Konno et al.
patent: 4851978 (1989-07-01), Ichihara
patent: 4939630 (1990-07-01), Kikuchi et al.
Nikon Corporation
Wintercorn Richard A.
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