Development device, process cartridge, and image forming apparatus

摘要

An image forming apparatus is provided which includes a development device that has no developer supply member and with which the decrease in density at a back end of a solid image and occurrence of ghosting are suppressed. A development roller having dielectric portions scattered on a surface thereof is provided and components are configured so that the position of the dielectric portions in a triboelectric series is on the same polarity side, relative to a regulating blade, as the normal charge polarity of the toner.

主权项

1. A development device comprising a container that contains a toner, a toner bearing member that has dielectric portions scattered on a surface thereof and bears the toner, and a regulating member that regulates a layer thickness of the toner on the toner bearing member,
wherein, with respect to a triboelectric series, a position of the dielectric portions on the triboelectric series with respect to positions of the toner and regulating member, is such that the dielectric portions are more likely to be charged to have a same polarity as a normal charge polarity of the toner, than a polarity of the regulating member.