DEVELOPING APPARATUS

摘要

A developing apparatus includes a developer carrying sleeve for carrying a developer to a position opposing an image bearing drum, wherein said sleeve is provided with a plurality of groove portions extending in an axial direction of said sleeve; and a developing bias voltage applying device for applying a developing bias voltage to said sleeve, wherein said bias voltage applying device is capable of outputting, as the 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 sleeve, and a duration t1 (s) of the blank portion in one cyclic period of the bias voltage satisfy L/Vs

主权项

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 sleeve, and a duration t1 (s) of the blank portion in one cyclic period of the developing bias voltage satisfy, L/Vs