Image forming apparatus including exposure head provided with plurality of light emitting chips

An image forming apparatus, comprising:

• a photosensitive member that is driven to rotate;
• an exposure head including at least one light emitting chip, the at least one light emitting chip including a plurality of light emitting elements that are placed at different positions in a direction along a rotation axis of the photosensitive member, a digital-analog converter that outputs a voltage corresponding to a setting value as a digital value, and a circuit unit that supplies a current to the plurality of light emitting elements based on the voltage output from the digital-analog converter;
• and
• at least one processor configured to:
• set a value that has been decided on so that one light emitting element included among the plurality of light emitting elements emits light of a predetermined amount as the setting value in the at least one light emitting chip,
• generate image data for causing the plurality of light emitting elements to emit light, and
• correct the image data such that a number of the plurality of light emitting elements that emit light changes,
• wherein the circuit unit supplies a current to each of the plurality of first light emitting elements based on the corrected image data.