Image forming apparatus

Details Image forming apparatus Image forming apparatus

2009-04-07

2011-12-27

Gray, David (Department: 2852)

Electrophotography

Diagnostics

Consumable

C399S062000, C399S267000

Reexamination Certificate

active

08086118

ABSTRACT:
In accordance with an embodiment of the embodiment of the invention, an image forming apparatus includes: an electrostatic image-bearing member; and a developing device. The developing device includes a developer-carrying member disposed to face the electrostatic image-bearing member, and a developer carried on the developer-carrying member. The developer includes a carrier having a volume-average particle size dc (μm) and a toner having a volume-average particle size dt (μm) of at most 5 μm and contained at a weight ratio C with respect to the carrier of from 5 to 10% and is controlled so as to provide a surface coverage F of the carrier with the toner of from 30 to 80% as calculated according to Formula (I): F=(¼)×(dc/dt)×(pc/pt)×C, wherein pc denotes a true specific gravity (−) of the carrier, pt denotes a toner absolute specific gravity (−), and C denotes a weight ratio (−) of the toner to the carrier.

REFERENCES:
patent: 2002/0022190 (2002-02-01), Iizuka et al.
patent: 2006/0045575 (2006-03-01), Mabuchi et al.

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