Apparatus for producing internegatives

Details Apparatus for producing internegatives Apparatus for producing internegatives

1986-09-04

1987-09-01

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 68, 355 70, G03B 2772

Patent

active

046905464

ABSTRACT:
An apparatus for producing internegatives includes a slide holder for positioning the slide from which the internegative is to made, a primary photoflash unit for back-illuminating the slide and projecting the image thereof into a camera, a secondary photoflash unit for directing a contrast correction exposure into the camera via a reflecting plate, and a stored programed controlled processor for controlling the time duration of the primary exposure, the contrast correction exposure, and the operation of the camera so as to properly exposure the film in the camera. A back-illuminated light screen is provided to allow the operator to evaluate the brightness of the slide so as to control the duration of the primary exposure and the contrast correction to consistently produce properly exposed internegatives.

REFERENCES:
patent: 3060796 (1962-10-01), Muse
patent: 3308716 (1967-03-01), Caporael
patent: 3645620 (1972-02-01), Jaffe
patent: 3754825 (1973-08-01), Sorli et al.
patent: 4043662 (1977-08-01), Garfall

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