Exposure head, image forming apparatus, and circuit board

An image forming apparatus comprising:

• a photosensitive drum;
• an exposure head configured to emit light according to image data to form an electrostatic latent image on the photosensitive drum, the exposure head including:
• a circuit board on which a plating layer is formed;
• a semiconductor chip, which is provided on the plating layer, and includes a light emitting element configured to emit the light for exposing the photosensitive drum;
• a lens array configured to condense the light emitted from the light emitting element onto the photosensitive drum;
• and
• a housing to which the lens array and the circuit board are fixed,
• wherein the plating layer and a part of the housing abut against each other in an optical axis direction of the lens array, and
• wherein the light emitting element and the lens array are opposed to each other in the optical axis direction;
• and
• a developing device configured to develop the electrostatic latent image formed on the photosensitive drum with a toner.