Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1979-08-06
1981-12-22
Moses, Richard L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
118679, 355 8, 355 14D, 355 71, G03G 1500
Patent
active
043068049
ABSTRACT:
An exposure unit radiates a light image of an original document onto a charged photoconductive member to form an electrostatic image through localized photoconduction. A developing unit applies a powdered developing substance comprising carrier particles and toner particles to the photoconductive member to develop the electrostatic image and produce a toner image which is transferred and fixed to a copy sheet to produce a permanent reproduction of the original document. Prior to exposure with the light image a reference electrostatic image is formed on the photoconductive member and the electrostatic potential thereof is measured. The intensity of the light image of the original document and/or a developing bias voltage are regulated in accordance with the sensed electrostatic potential. The reference image may be of a reference surface having a predetermined optical density or a portion of the original document produced by reverse optical scanning.
REFERENCES:
patent: 3788739 (1974-01-01), Coriale
patent: 4050806 (1977-09-01), Miyakawa et al.
Miyakawa Seiichi
Sakamoto Koji
Tatsumi Susumu
Moses Richard L.
Ricoh & Company, Ltd.
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