Patent ID: 8179415

Claim:
An exposure head comprising: a group of light emitting elements in which light emitting elements are arranged in a first direction; a light emitting element substrate in which the group of light emitting elements and a different group of light emitting elements are arranged in the first direction and in a second direction orthogonal or substantially orthogonal to the first direction; and a driving substrate which drives the light emitting elements arranged on the light emitting element substrate, wherein the driving substrate controls a light emission intensity of a light emitting element that is near to a first end side in the first direction in the group of light emitting elements, so that the intensity is smaller than a light emission intensity of a complementary light emitting element that is near to a second end side in the first direction in the different group of light emitting elements, and the light emission intensity becomes smaller towards the first end side, a distance between the group of light emitting elements and the different group of light emitting elements is widened or narrowed in the first direction, and an overall light emission intensity of the group of light emitting elements along the first direction decreases non-linearly.