BIAS CONTROL DEVICE, DEVELOPING DEVICE, PROCESS CARTRIDGE AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a developer supply device that improves the uniformity of developer in a developing device after supply and restricts waste consumption of developer and image quality deterioration.SOLUTION: A bias control device 200 supplies bias to a supply member 36 and the developer carrier 35 of a developing device 5 to which supply developer T1 is supplied from a developer supply container 4, thereby moving developer T from the supply member to the developer carrier, comprises control means 100 configured such that until a predetermined time t has elapsed from the start of the supply of the supply developer T1 to the developing device from the developer supply container, developer reversely charged in the supply developer T1 supplied from the developer supply container and in the developer T that has deteriorated in the developing device are normally charged.