Patent ID: 8433211
Filing Date: 2013-04-30
Classification: G03G

Abstract:
1. A developing device comprising: a toner carrying member having plural electrodes; a toner supply unit configured to supply toner on a surface of the toner carrying member; and a hopping electric field generator unit configured to generate, when the toner is carried in a developing region facing a latent image carrying member, an electric field to cause the toner to perform hopping on the surface of the toner carrying member by applying a pulse voltage to the plural electrodes carried thereon to attach the toner to a latent image on the latent image carrying member, wherein the hopping electric field generator unit includes: wherein the hopping electric field generator unit controls the peak value of the pulse voltage by changing an output level of the first power source, and controls a mean of the pulse voltage by changing an output level of the second power source.