Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1983-03-24
1986-04-22
Moses, R. L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 14E, 355 14D, G03G 1500
Patent
active
045838399
ABSTRACT:
An image recording apparatus such as a copying machine has a surface potentiometer for detecting the surface potential of the original image, a microcomputer for integrating the measured surface potential, AC and DC development bias control circuits for controlling the development bias, and a lamp regulator for controlling exposure. In accordance with the integrated value of the surface potential, the development bias or exposure is controlled so as to allow production of an image having excellent gradation even when the original is a halftone image such as a photograph. The apparatus allows selection between automatic or manual control of development bias and exposure.
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patent: 4200391 (1980-04-01), Sakamoto et al.
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patent: 4306804 (1981-12-01), Sakamoto et al.
patent: 4341460 (1982-07-01), Kohyama
patent: 4344699 (1982-08-01), McIntosh
patent: 4352553 (1982-10-01), Hirahara
patent: 4358520 (1982-11-01), Hirayama
Canon Kabushiki Kaisha
Moses R. L.
Pendegrass J.
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