Electrophotography – Image formation – Development
Reexamination Certificate
2011-08-16
2011-08-16
Porta, David P (Department: 2884)
Electrophotography
Image formation
Development
C399S053000, C399S254000
Reexamination Certificate
active
08000638
ABSTRACT:
A developing device that efficiently adjusts the amount of charge on the developing agent without being affected by external conditions, and that continuously supplies a developing agent with the appropriate toner concentration and amount of charge. An ionized air flow adjusts the amount of charge on the developing agent discharged from the developing unit to improve the dispersability of the replenished toner without applying unnecessary stress. The developing agent is raised upwards by a screw, downwards by an agitation member, and then gathered by a screw in a circulating flow. Consequently, the developing agent is uniformly mixed within the developing agent agitation unit. This circulating flow of the developing agent increases the probability of contact and reduces damage to the developing agent. When the ionized air flow reduces the amount of charge before agitation, the toner can be uniformly charged to the appropriate value.
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Iwata Nobuo
Katoh Natsumi
Matsumoto Jun-ichi
Ohmura Tomoya
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Porta David P
Ricoh & Company, Ltd.
Schmitt Benjamin
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