Electrophotography – Image formation – Development
Reexamination Certificate
2011-03-22
2011-03-22
Ngo, Hoang (Department: 2852)
Electrophotography
Image formation
Development
C399S270000, C399S272000
Reexamination Certificate
active
07912410
ABSTRACT:
A developing device for a toner powder cloud development system, which can achieve high image quality and can be made compact. The developing device has a two-component development unit, a toner carrier, and an alternating current power source. The toner carrier, which is arranged opposing a latent image carrier, has a plurality of electrodes disposed in a line in a prescribed direction on the surface thereof, and mutually insulated. The alternating current power source supplies a voltage such that an electric field across the plurality of electrodes is temporally switched. The inter-electrode electric field causes the toner being carried on the surface of the toner carrier to carry out hopping, thereby forming a toner powder cloud and carrying out development. The movement speed of the latent image carrier and the linear velocity of the toner carrier are set at approximately equivalent speeds.
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Ishii Yasuyuki
Kadota Ichiro
Kosugi Hideki
Nakagawa Yoshinori
Takahashi Tomoko
Ngo Hoang
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
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