DEVELOPING DEVICE

Japanese Patent JP3200325

B2

PURPOSE: To make a toner layer on a surface of a developing roller evenly thin layer, and to prevent a generation of fogging, by forming a recessed part for developer to enter on a surface of the developer carrier, and composing so that number density of the developer entering the recessed part has a specified relation.
CONSTITUTION: This device is provided with recessed parts 32 on the surface of developer carrier 16 for the developer to enter and constituted that the number density of the developer entering the recessed part 32 expressed as (α), and nip width between the developer control member 26 and the developer carrier 16 as L1, are respectively set so as to satisfy the next inequality, 3<α.L1<10. Then, the developer charged by friction by the developer held in contact with the developer carrier 16 is stuck on the surface of developer carrier 16, and enters the recessed part 32. Since the developer 34 entrapped in the recessed part 32 in a fixed state is rubbed by the normal developer, charge of the developer is restrained, and the developer is made easily severable from the developer carrier 16 and easily controllable by the developer control member 26. Thus, the layer thickness of the developer is prevented from increasing and the generation of fogging is restrained.

Toshihiro Ota
Shigeyuki Wakata
Keiji Kato
Eiichi Kido
Yuhi Yui

JP8659095A

August 20, 2001

April 12, 1995

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Sharp Corporation

G03G15/09; G03G13/08; G03G15/08; (IPC1-7): G03G15/08

JP250182A
JP5257374A
JP450878A
JP6214454A
JP6175476A
JP6138774A
JP63101879A
JP6279257U

Taiji Oshima (2 outside)

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