Photographic direct-print system

Details Photographic direct-print system Photographic direct-print system

1980-03-05

1981-11-24

Miller, Jr., George H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 83, G03B 2780

Patent

active

043021000

ABSTRACT:
A photographic direct-print system for producing a screened print from a continuous tone negative. Fundamentally, the invention includes an enlarger having a main lamp associated therewith for receiving a negative and casting an image thereof upon an easel. Flashlamps are maintained in juxtaposition to the easel for further illuminating the same. A density read-out circuit, comprising a photodiode presenting an output to a digital volt meter, is included for measuring the light intensity of various areas of the image, such read-out determining the lens setting of the enlarger and the intensity of the flashlamps, as regulated by a power phase control circuit. A timer is included for controlling a period of simultaneous energization of the enlarger and flashlamps, the timer being controlled by a clock having a frequency which is dependent upon the intensity of the main lamp of the enlarger.

REFERENCES:
patent: 3542470 (1970-11-01), Ost
patent: 3732011 (1973-05-01), Hansard
patent: 3868183 (1975-02-01), Childers
patent: 4025190 (1977-05-01), Hughes

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