DEVELOPING DEVICE AND IMAGE FORMING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a developing device capable of suppressing the bulk density change and charging quantity change of a developer and precisely controlling toner density. SOLUTION: In a developing device 32 for correcting the output of a toner density detecting sensor 43 by detecting the temperature and humidity of a developer by a temperature and humidity sensor 2 a developing sleeve 38 is rotated in the reverse direction (b) to the rotating direction (a) of a photoreceptor drum 3, and a regulating blade 41 for regulating the developer thickness on the developing sleeve 38 is arranged under the developing sleeve 38, and a spherical toner produced by polymerization with form coefficient SF-1 of 100-140 and SF-2 of 100-120 is used as the toner.