Patent ID: 9195163
Filing Date: 2015-11-24
Classification: G03G

Abstract:
1. A developing device comprising: a developer bearer including two development rollers and disposed to face a latent image bearer; and an alternating voltage circuit configured to apply an alternating voltage to the developer bearer to generate an alternating electrical field in a development range to cause toner to move from the developer bearer to the latent image bearer while reciprocating therebetween, wherein the alternating voltage has a frequency within a range from 10 kHz to 60 kHz and a peak-to-peak voltage of 300 V or greater, a waveform of the alternating voltage includes a non-development portion having a polarity to move toner from the latent image bearer to the developer bearer, a leading end portion of the non-development portion has a greater absolute voltage value than a rest of the non-development portion, wherein only the non-development portion has a leading end of a greater absolute voltage value than the rest of the non-development portion of the waveform of the alternating voltage.