Exposure control for subtractive photographic printer

Details Exposure control for subtractive photographic printer Exposure control for subtractive photographic printer

1980-09-11

1982-07-27

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 88, G03B 2772, G03B 2776

Patent

active

043414656

ABSTRACT:
A subtractive photographic printer is capable of providing extremely short exposure time by coordinating the operation of a shutter and color filters. The shutter is normally positioned in the light path, and is driven out of the light path at the beginning of an exposure cycle. The exposure in each color channel is terminated by driving the color filter associated with that color channel into the light path in a direction which is essentially the same as the direction in which the shutter was driven out of the light path. In addition, the filter is driven into the light path at essentially the same rate at which the shutter was driven out of the path. The exposure time for the color channel is determined by the time delay between actuation of the shutter drive and actuation of the filter drive, since the shutter and the filter move in the same direction and at essentially the same rate. It is possible, therefore, to achieve exposure times which are shorter than the time required to drive the shutter out of the light path or the filter into the light path, since the exposure time is determined by the time delay between actuation of the shutter drive and the filter drive, rather than the response times of the shutter and filter drive.

REFERENCES:
patent: 2997389 (1961-08-01), Boon
patent: 3661458 (1972-05-01), Noemer et al.

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