Image forming apparatus

An image forming apparatus comprising:

• a photosensitive member configured to rotate;
• a plurality of light-emitting chips in each of which are provided a plurality of light-emitting units configured to emit light for exposing the photosensitive member, a circuit unit configured to turn on and off the plurality of light-emitting units based on image data for controlling the turning on and off of the plurality of light-emitting units, and a storage unit configured to store control data indicating a target amount of light of the plurality of light-emitting units, wherein the plurality of light-emitting chips is arranged along a rotational axis direction of the photosensitive member;
• and
• a controller integrated circuit (IC) configured to output control data,
• wherein the controller IC and each of the plurality of light emitting chips are connected respectively via a signal line, and the signal line is not shared,
• wherein, control data output by the controller IC is transmitted via the signal line to each of the plurality of light emitting chips, and the transmitted control data is stored in the storage unit.