Patent ID: 9052634
Filing Date: 2015-06-09
Classification: G03G

Abstract:
1. A developing apparatus comprising: a developer carrying member for carrying a developer to a position opposing an image bearing member, wherein said developer carrying member is provided with a plurality of groove portions extending in an axial direction of said developer carrying member; and a developing bias voltage applying device for applying a developing bias voltage to said developer carrying member, wherein said developing bias voltage applying device is capable of outputting, as the developing bias voltage, a voltage of a waveform having a cyclic period including an AC bias portion comprising an AC component and a DC component superimposed thereto, and a blank portion following the AC bias portion and consisting of a DC component, wherein a width L (m) of the groove, a peripheral speed Vs (m/s) of said developing carrying member, and a duration t1 (s) of the blank portion in one cyclic period of the developing bias voltage satisfy, L/Vs<t1.