Apparatus for making test exposures on marginal portions of phot

Details Apparatus for making test exposures on marginal portions of phot Apparatus for making test exposures on marginal portions of phot

1979-01-22

1981-04-07

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

355 64, G03B 1500, G03B 2732

Patent

active

042602459

ABSTRACT:
Apparatus for exposing a gray sample onto the unexposed perforated marginal portion of a web of photographic film has a drum over which the web is trained while moving lengthwise, and a device which monitors the web and generates a signal on detection of successive or selected perforations. Such signals are delayed for an interval of time which insures that a field which is to be provided with a test exposure and is located at a predetermined distance from the perforation which has caused the generation of a signal is located in the range of an imaging system operating with a flash unit to expose the sample onto the aforementioned field. The delay can be effected by a computer which receives the aforementioned signals and which further receives signals denoting incremental advances of the web through distances of selected unit length. The test exposures are used in the copying machine for comparison with a color chart to insure proper selection of intervals during which the film frames are exposed to light of various colors.

REFERENCES:
patent: 1431893 (1922-10-01), Jones
patent: 2753757 (1956-07-01), Roth
patent: 3354777 (1967-11-01), Normandy et al.
patent: 3645619 (1972-02-01), Burton et al.
patent: 3718074 (1973-02-01), Davis
patent: 3898002 (1975-08-01), Kinder et al.
patent: 4079388 (1978-03-01), Takahama et al.
patent: 4089018 (1978-05-01), Asano

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