Optics: image projectors – Plural projection paths with single light source
Patent
1974-10-15
1976-09-28
Stern, Ronald J.
Optics: image projectors
Plural projection paths with single light source
353 84, 355 35, 355 71, G03B 2776, G02B 520
Patent
active
039828255
ABSTRACT:
A color filter head for attachment to photographic enlargers has a universal mount adapted for ready attachment to lens mounts regardless of size and a unique system for sequential color addition and integration to produce a color corrected print. The filter head includes a manually rotatable, adjustable filter disc assembly having high-density filter segments which are relatively movable under an overlying cover disc having two opposed open quadrants. The filter assembly acts like a balanced fly wheel which is mounted beneath the enlarger lens. In normal use, the light from the lens passes through the open quadrants of the cover disc and through the portion of the filter material disposed in the open quadrants as the wheel is manually rotated during the printing step. The system thereby utilizes a method of sequential light addition and integration. Sequential periods of white and colored light are integrated to produce the desired total exposure. By proper filter disposition beneath the lens during exposure, desired color balance is obtained in the finished color print. The periphery of the cover disc has calibrations thereon whereby the desired degree of effective color density is readily and accurately achieved by mere tab movement.
REFERENCES:
patent: 2049556 (1936-08-01), Chapman et al.
patent: 2060503 (1936-11-01), Killman et al.
patent: 2228479 (1941-01-01), O'Grady
patent: 3366006 (1968-01-01), Saila
patent: 3885859 (1975-05-01), Dalgleish et al.
Photo Systems, Inc.
Stern Ronald J.
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