Illumination optical system

Details Illumination optical system Illumination optical system

1988-11-04

1989-07-25

Hix, L. T.

Photocopying

Projection printing and copying cameras

Plural

355 67, 362311, G03B 2744

Patent

active

048518824

ABSTRACT:
An illumination optical system including an optical system effective to direct light from a light source to a surface to be illuminated, and an optical unit disposed in a path of the light defined by the optical system, the optical unit having a variable refracting power which is variable in accordance with the size of the surface to be illuminated.

REFERENCES:
patent: 1783998 (1930-12-01), Chretien
patent: 3649113 (1972-03-01), Harvey
patent: 3876289 (1975-04-01), DeVeer et al.
patent: 4444471 (1984-04-01), Ford, Jr. et al.
patent: 4497015 (1985-01-01), Konno et al.
patent: 4564267 (1986-01-01), Nishimoto
patent: 4619508 (1986-10-01), Shibuya et al.
patent: 4645924 (1987-02-01), Suzuki et al.

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