Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1982-12-20
1985-02-12
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Focus or magnification control
35016216, 355 61, 356401, G03B 2752
Patent
active
044987625
ABSTRACT:
A projection type exposure apparatus has a projection objective lens, a projection negative having a predetermined shape pattern and an alignment mark, and a photosensitive plate having an alignment mark. The shape pattern of the projection negative is projected upon the photosensitive plate by the projection objective lens. Main illuminating optical means illuminates the projection negative with a first wavelength light to which the photosensitive plate is sensitive, and alignment optical means illuminates the projection negative with a second wavelength light to which the photosensitive plate is insensitive. The positional relation between the projection negative and the photosensitive plate is detected using the second wavelength light through the projection objective lens. One of the alignment mark on the projection negative and the alignment mark on the photosensitive plate has a zone pattern which forms a light-condensing point at a position spaced apart by a predetermined amount from the surface on which said one mark is formed, and said predetermined amount corresponds to the amount of chromatic aberration of the projection objective lens, at the side thereof adjacent to said zone pattern, for the second wavelength light relative to the first wavelength light.
REFERENCES:
patent: 4037969 (1977-07-01), Feldman et al.
patent: 4326805 (1982-04-01), Feldman et al.
patent: 4395117 (1983-07-01), Suzuki
Anzai Satoru
Uehara Makoto
Nippon Kogaku K.K.
Wintercorn Richard A.
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