Patent ID: 8265500
Filing Date: 2012-09-11
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a photosensitive member; an image forming station including a charging device for electrically charging said photosensitive member, an exposure device for exposing to light the photosensitive member charged by the charging device, a developing device for developing with toner an electrostatic latent image formed on said photosensitive member by the exposure device, and a bias applying device for applying to the developing device a developing bias comprising a DC voltage and an AC voltage; a transfer device for transferring a toner image from said photosensitive member onto a sheet; a setting device for setting the AC voltage at a first AC voltage when image formation is effected on a first sheet and setting the AC voltage at a second AC voltage different from the first AC voltage when image formation is effected on a second sheet different in type from the first sheet; an executing device for executing a test mode for forming a test image on said photosensitive member; a density detecting device for detecting a density of the test image in the test mode; and an adjusting device for adjusting an image forming condition for said image forming station depending on an output of said density detecting device; wherein when said executing device executes the test mode during a job for effecting image formation successively on a plurality of sheets including the first sheet and the second sheet, a first test image is formed with the AC voltage set at the first AC voltage and then a second test image is formed with the AC voltage set at the second AC voltage.