| abstract |
(57) [Abstract] (with correction) [PROBLEMS] To improve the developing ability of a developing device and to suppress the occurrence of background contamination due to reversely charged toner even when the background potential changes in the range of 0 to 200V. And an image forming apparatus, an image forming apparatus, and an image forming process unit. SOLUTION: In a developing method and an apparatus for carrying a developer 12 on a surface of a developing sleeve 421 to which a developing bias voltage is applied, transporting the developer 12 to a developing area, and developing a latent image on a photoconductor 1, The dynamic resistance of the magnetic particles 11 is 10 2 to 10 6 Ω or less, and the absolute value of the average charge amount of the toner in the developer on the developing sleeve is 10 to 25 [μC / g] or less, the half-width in the profile of the toner particle number distribution of the developer carried on the developing sleeve is 28% or less of the peak particle value in the toner particle number distribution profile. |