Light amount control, optical writing, and image forming apparatuses having a plurality of drive-current setting units

摘要

A light-amount control apparatus for controlling an output light amount of light sources used for optical writing is disclosed. The apparatus includes one or more drive units for supplying a drive current to the light source; one or more drive-current setting units for determining an amount of the drive current provided to the light source from the drive unit; a light-amount detecting unit for detecting an output light from the light source; and outputting a voltage according to the detected light amount; and a processing unit for setting the drive current amount based on the detected value detected with the light-amount detecting unit.