Electrophotography – Control of electrophotography process – Control of developing
Reexamination Certificate
2005-06-21
2005-06-21
Grainger, Quana (Department: 2852)
Electrophotography
Control of electrophotography process
Control of developing
C399S281000
Reexamination Certificate
active
06909860
ABSTRACT:
An image forming apparatus includes an image bearing drum, a developing roller, a toner-supplying roller, and a controller. The developing roller deposits toner to an electrostatic latent image formed on the image bearing drum. The toner-supplying roller is spaced a distance in the range of 0.05 to 1.0 mm from the developing roller and supplies toner to the developing roller. The controller applies a first voltage to the developing roller and a second voltage to the toner-supplying roller. The difference between the first voltage and the second voltage is greater than 130 volts and lower than a voltage above which electrical discharge occurs across the developing member and the toner-supplying roller. The toner-supplying roller has a surface with ridges and valleys formed therein, which extend in a longitudinal direction of the toner-supplying roller. The ridges have a height in the range of 10 to 1000 μm.
REFERENCES:
patent: 4786936 (1988-11-01), Ikegawa et al.
patent: 4885223 (1989-12-01), Enoki et al.
patent: 2003/0202811 (2003-10-01), Kamimura et al.
patent: 2001-242701 (2001-09-01), None
Sato Hiroaki
Serizawa Takashi
Grainger Quana
Oki Data Corp.
Rabin & Berdo P.C.
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