Harness, Dickey & Pierce, P.L.C.
Developing device, and image forming apparatus and process cartridge incorporating same
A developing device includes a casing to contain developer and define a developer circulation passage, a developing roller to bear the developer, and at least one developer conveyor to convey the developer. The developer conveyor is disposed in the developer circulation passage and lower than the developing roller. The developing device satisfies M1/L2>0.56 g/cm and M1/M2>0.50, where M1 represents an amount of developer borne on the developing roller, L1 represents a width in which the developing roller bears the developer in a longitudinal direction of the developing roller; and M2 represents an amount of developer stored in the casing and excluding the amount of developer borne.
Ricoh Company, Ltd.
G G G H
G03G G03G G03G H04N
inventional inventional inventional additional
Ichiro Shinji Hiroshi Keiichi
Kadota Tamaki Hosokawa Yoshida