Patent ID: 9207558
Filing Date: 2015-12-08
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a plurality of photosensitive drums; a plurality of charging devices configured to charge the respective corresponding photosensitive drums, a charging voltage being applied to the plurality of charging devices from a common power supply; an exposure unit configured to expose surfaces of the plurality of photosensitive drums charged by the charging devices with a first laser power to generate a non-image portion potential, and expose the surfaces with a second laser power to generate an image portion potential; a plurality of developing members configured to make a developer adhere to an area where the image portion potential is generated to form a developer image on the respective corresponding photosensitive drums, a developing voltage being applied to the plurality of developing members from a common power supply; a control unit configured to control an intensity of the charging voltage applied to the plurality of charging devices and output of the laser powers of the exposure unit; and an acquisition unit configured to acquire thicknesses of photosensitive layers of the respective plurality of photosensitive drums, wherein the control unit is configured to set the intensity of the charging voltage applied to the plurality of charging devices according to a maximum thickness among the plurality of thicknesses acquired by the acquisition unit, and individually control the output of the first laser power for each of the photosensitive drums according to surface potentials of the respective charged photosensitive drums.