Imaging apparatus, and toner and process cartridge used in the imaging apparatus

摘要

An imaging apparatus that is capable of realizing good cleaning characteristics and transfer characteristics, and obtaining a high quality image using toner having a high average roundness is provided. The imaging apparatus includes an image carrier, a charge unit, a developing unit, a transfer unit, and a cleaning unit. The transfer unit may directly transfer a toner image onto a recording medium that is carried by a transfer belt, or transfer the toner image onto the transfer belt first to then transfer the toner image onto the recording medium from the transfer belt. The cleaning unit includes a cleaning blade and a brush roller. The toner used in the imaging apparatus has an average roundness Psi within a range of 0.93~0.99, and a friction coefficient mus of the image carrier satisfies a condition, friction coefficient mus<=3.6-3.3xaverage roundness Psi.