Optically imaging method and apparatus

Details Optically imaging method and apparatus Optically imaging method and apparatus

1990-03-12

1991-10-29

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 53, 355 77, G03B 2752

Patent

active

050619560

ABSTRACT:
An optically imaging method and an apparatus therefor are disclosed. The illuminating lens and first imaging lens of an optical lens system comprising the four lenses of first and second illuminating lenses and first and second imaging lenses sandwich a pattern source. Moving the second illuminating lens and first imaging lens in unit with a distance therebetween fixed can image a pattern image at a desired magnification at an image point of the second imaging lens falling within an allowable object space focal depth and produce an illuminant image of an illuminant falling within an allowable entrance pupil position range of a projection lens so that an opening ratio of the illuminant image falls within a predetermined range. An illuminant image of a high contrast and a good telecentricity is produced. In a magnification adjustment of the pattern image, a distance between the second imaging lens and projection lens need not be corrected but the second illuminating lens and first imaging lens may be simply moved in unit.

REFERENCES:
patent: 3495512 (1970-02-01), Vaughan
patent: 4668077 (1987-05-01), Tanaka
patent: 4737823 (1988-04-01), Bouwer et al.
patent: 4811055 (1989-03-01), Hirose
patent: 5008702 (1991-04-01), Tanaka et al.

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