| 摘要 |
PROBLEM TO BE SOLVED: To reduce toner scattering in two component developer. SOLUTION: In a developing device 12, a multiple magnetic pole developing roll 13 carrying a magnetic brush of the two component developer containing toner and carrier and transporting it to a developing range facing a photoreceptor drum 11 and carrying out developing by having the magnetic brush on the multiple magnetic pole developing roll 13 comes into contact with the photoreceptor drum in the developing range, the St/Sc between whole actual projected area St of the toner and whole actual surface area Sc of the carrier in a leading tip part of the magnetic brush in the downstream part of the developing range is <=100%. |
