IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To provide an image forming apparatus which ensures uniform halftone, prevents edge emphasis and carrier adhesion to an image carrier, and can form an image of high image quality, and in which neither density change nor poor belt cleaning occurs even when a low-cost seamless belt is used. SOLUTION: In the image forming apparatus, a developing device 1 holds a developer comprising a magnetic carrier and a nonmagnetic toner, the developer in a developing vessel 100 is carried and conveyed to a surface of a developer carrier 102 by a magnetic field generating member 103 having a plurality of magnetic poles fixed in the developer carrier 102, and an electrostatic latent image on an image carrier 3 is developed by applying development bias. The magnetic carrier has the magnitude of magnetization σ1000of 30-230 emu/cm3in a magnetic field of 1 kOe and a specific resistance of ≥1011Ωcm at a field intensify of 5×104V/m, the gap between the developer carrier 102 and the image carrier 3 is ≤4×10-4m, and the development bias is only a DC bias. COPYRIGHT: (C)2005,JPO&NCIPI