Electrophotography – Image formation – Development
Patent
1999-08-09
2000-11-21
Beatty, Robert
Electrophotography
Image formation
Development
G03G 1508
Patent
active
061514748
ABSTRACT:
A developing unit of the present invention includes a case which accommodates toner containing pigment, a developing roller, a supply roller formed of an elastic member arranged to be pressed against a surface of the developing roller in such a manner as to supply toner to the surface of the developing roller. Moreover, the percentage of open cells in the elastic supply roller is made to be 30% or higher and depth of engagement of the supply roller to the developing roller is made to 0.4 mm or smaller. The toner has shape factors SF-1 of 150 or smaller and SF-2 of 140 or smaller.
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Aruga Tomoe
Ichikawa Kazuhiro
Ishiwatari Tahei
Kin Hidenori
Nakashima Yoshihiro
Beatty Robert
Seiko Epson Corporation
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