Being the lens array which possessed long form in the direction where lens array, lens unit, the LED head, the exposure device, the picture formation device and the

摘要

PROBLEM TO BE SOLVED: To prevent deterioration in resolution due to a flow mark occurring when a lens array is molded.;SOLUTION: A lens array 1 has a plurality of lenses 12A and 12B whose optical axes AXL are substantially in parallel with each other. The lenses 12A and 12B are arrayed in a direction substantially perpendicular to the optical axes AXL, and are integrally formed with one another. Assuming that the maximum value of an angle formed by the respective optical axes AXL and a normal line of lens surfaces of the respective lenses 12A and 12B is the maximum inclined angle of the lens surface, the maximum inclined angle of the lens surface is 50.8 degrees or smaller. With this configuration, the lens array suppresses occurrence of a flow mark when the lens array is molded, thereby preventing deterioration in resolution.;COPYRIGHT: (C)2012,JPO&INPIT