A line head, includes: a plurality of luminous elements grouped into a plurality of luminous element groups; and a lens array which includes a plurality of lenses each of which faces the luminous element group, focuses light beams emitted from the luminous element group on an image plane, and accordingly...http://www.google.fr/patents/US7995084?utm_source=gb-gplus-shareBrevet US7995084 - Line head and an image forming apparatus using the line head
Line head and an image forming apparatus using the line head
