Photocopying – Including fiber optics
Patent
1978-08-28
1981-05-19
Moses, R. L.
Photocopying
Including fiber optics
355 3CH, 430126, G03G 1500
Patent
active
042681570
ABSTRACT:
A photoconductive drum is formed with a photoconductive dielectric layer for producing an electrostatic image and an endless transfer belt is formed with a dielectric layer thereon. A toner substance is applied to the drum to produce a toner image, and a copy sheet is pressed between the belt and drum to transfer the toner image to the copy sheet. An electric potential of the same polarity as the electrostatic image is applied to the copy sheet to attract the toner from the drum onto the copy sheet. The potential has a magnitude which is slightly less than a magnitude at which charge transfer from the belt to the drum occurs due to dielectric breakdown through the copy sheet or field emission from the copy sheet to the drum which would degrade the electrostatic image. The method enables a large number of copies to be produced from a single electrostatic image through repeated development and transfer.
REFERENCES:
patent: 3627523 (1971-12-01), Shelffo
patent: 3697170 (1972-10-01), Bhagat et al.
patent: 3751156 (1973-08-01), Szostak et al.
patent: 3830589 (1974-08-01), Allen
patent: 3837741 (1974-09-01), Spencer
patent: 3924943 (1975-12-01), Fletcher
Ebi Yutaka
Hirakura Koji
Matsumoto Fuyuhiko
Ohta Wasaburo
Tomita Satoru
Moses R. L.
Ricoh & Company, Ltd.
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