Photocopying – Projection printing and copying cameras – With cathode ray tube for light source
Patent
1989-04-14
1990-07-10
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
With cathode ray tube for light source
355 69, 358244, G03B 2772, G03B 2780
Patent
active
049410130
ABSTRACT:
An exposure device for an image exposure onto a photosensitive recording medium includes a cathode ray tube serving as an exposure light source which supplies an optical radiant energy onto the recording medium. The photosensitive recording medium has an .gamma. characteristic in a relation between the density of the image recorded thereon and an optical radiant energy applied thereto. For recording an image corresponding in density to an image of an original, there is provided a driver circuit which receives an input voltage indicative of the density of the image on the original and when the input voltage exceeds a predetermined value, an output voltage applied to the cathode ray tube to cause an image of 0% (white) in density to be recorded on the recording medium. When the input voltage is below the predetermined value, the output voltage is applied thereto which changes in proportion to the input voltage. Accordingly, not only the reproduction of the white color is ensured but also half-tone can faithfully be reproduced.
REFERENCES:
patent: 3177764 (1965-04-01), Akima
patent: 3400632 (1968-09-01), Wahli
Brother Kogyo Kabushiki Kaisha
Wintercorn Richard A.
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