Exposure head, image forming device, and image forming method

An image forming device comprising:

• a latent image carrier;
• and
• an exposure head having a substrate having a plurality of light emitting element rows each comprising a plurality of light emitting elements, the plurality of light emitting elements arranged in a first direction, the plurality of light emitting element rows being arranged in a second direction perpendicular or substantially perpendicular to the first direction;
• and
• a plurality of imaging optical systems comprising an array of lenses, each system configured to image light beams from the light emitting elements of the light emitting element rows on the latent image carrier to form a light-collected section, each lens of the imaging optical systems corresponding to a group of an odd number of light emitting element rows where the grown has at least three light emitting element rows,
• wherein two of the light emitting elements forming the light collected sections adjacent to each other in the first direction are respectively disposed in the two different light emitting element rows for the each of the imaging optical systems, and
• a center row of the at least three light emitting element rows is disposed so as to match or substantially match with the meridian plane of the imaging optical system.