Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1974-12-12
1977-05-31
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Multicolor picture
355 71, G03B 2776
Patent
active
040266508
ABSTRACT:
The device for correcting the color of a color film printing machine, equipped with three different optical filters which divide the diaphragm hole of an optical system condenser on three segments and two leaves, which partially stop down the filters; at the same time the leaves are suitably equipped with curved guides and pivot around points. Every pair of leaves is driven by a common lever equipped with a slide, which at the lever pivotal point, moves along guides. The linear increases of the lever turning angle is accompanied with a logarithmic increase of the filter-active field, for example, with a suitable radius of curvature, the guides, the length of lever, coordinates of the leaves', pivot points of lever, coordinates of pivot points of leaves, of the distance between the edge and the point of the leaves' pivot point, and coordinates which define the position of the guide curvature center in relation to the leaf edges.
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patent: 3267808 (1966-08-01), Czekalla et al.
patent: 3482914 (1969-12-01), Misener
patent: 3514200 (1970-05-01), Bowker
patent: 3596083 (1971-07-01), Lovering
patent: 3661458 (1972-05-01), Noemer et al.
patent: 3756712 (1973-09-01), Weisglass et al.
patent: 3880519 (1975-04-01), Barbieri
Centralne Laboratorium Optyki
Wintercorn Richard A.
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