Photocopying – Contact printing – Light boxes
Patent
1995-05-11
1996-01-23
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
118653, G03G 1508
Patent
active
054869099
ABSTRACT:
A developing device for an image forming apparatus and having a relatively hard first developing roller formed with fine N-S magnetic poles on the periphery thereof, and a relatively soft second developing roller for conveying toner electrostatically transferred thereto from the first roller toward a photoconductive drum. The toner is charged by friction while being passed through between the first roller and a blade, and then magnetically deposited on the first roller. At a position where the first and second rollers contact each other, the adequately charged toner is substantially evenly charged by friction and electrostatically transferred from the first roller to the second roller. The second roller conveys the toner toward the drum. The second roller has a surface roughness whose ratio to the mean particle size of the toner is selected to be less than or equal to 1.5.
REFERENCES:
patent: 4385829 (1983-05-01), Nakahata et al.
patent: 4508052 (1985-04-01), Kohyama
patent: 5412456 (1995-05-01), Tanuma et al.
patent: 5438395 (1995-08-01), Koga et al.
Endoh Shuichi
Hosokawa Hiroshi
Komatsubara Satoru
Matsumae Iwao
Murakami Eisaku
Chen Sophia S.
Pendegrass Joan H.
Ricoh & Company, Ltd.
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