MULTIBEAM SCANNING METHOD AND DEVICE, MULTIBEAM LIGHT SOURCE DEVICE AND IMAGE FORMING DEVICE

摘要

PROBLEM TO BE SOLVED: To effectively reduce the dispersion of the spot diameter of plural light spots in multibeam scanning. SOLUTION: In this multibeam scanning device, plural lines are simultaneously scanned by guiding plural beams from a light source 1 constituted by arranging plural light emission parts capable of being independently modulated monolithically in an array to a surface to be scanned 7 by common optical systems 2, 3, 4, 5 and 6 and condensing them as plural light spots separated in a subscanning direction. Then, the positions of the light emission parts of the light source are arranged to be uniformly deviated from the focal position of the common coupling lens 2 coupling the respective beams from plural light emission parts Ch1 to Ch4 to the succeeding optical systems in the optical axis direction of the coupling lens, and the dispersion of the spot diameter of plural light spots on the surface to be scanned 7 is reduced by adjusting the deviation.