Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1987-02-20
1988-04-19
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 68, 355 70, G03B 2772
Patent
active
047393750
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 programmed 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. In a second embodiment, a single photoflash unit, in cooperating with a movably mounted neutral density filter, is used to effect both the primary and contrast correcting exposures.
REFERENCES:
patent: 3060796 (1962-10-01), Muse, Jr.
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
Bender Richard H.
Edwards Lewis
Kuzyk Roman
ECB Technologies, Inc.
Hayes Monroe H.
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