| 摘要 |
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 (mum) and a toner having a volume-average particle size dt (mum) of at most 5 mum 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)x(dc/dt)x(pc/pt)xC, 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.
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