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 a plurality of light emitting chips that are placed at different positions in a direction along a rotation axis of the photosensitive member, a board on which the plurality of light emitting chips are mounted, and a lens that focuses light emitted by each of the plurality of light emitting chips onto a surface of the photosensitive member, each of the plurality of light emitting chips including a plurality of light emitting elements that are placed at different positions in the direction along the 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,
• wherein
• the at least one processor is configured to:
• generate second image data that is a set of bit data indicating whether each of the plurality of light emitting elements is to be lit or unlit from first image data that is a set of bit data indicating whether each of the plurality of light emitting elements is to be lit or unlit based on correction information, a number of light emitting elements of the plurality of light emitting elements indicated to be lit in the second image data being changed from a number of light emitting elements of the plurality of light emitting elements indicated to be lit in the first image data, and
• the circuit unit supplies a current to each of the plurality of light emitting elements based on the second image data.