Patent ID: 7907162
Filing Date: 2011-03-15
Classification: B41J,G03G

Abstract:
1. An exposure head comprising: 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 on an exposed surface 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 group 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 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.