Patent ID: 6790389
Filing Date: 2004-09-14
Classification: G02B,Y10S

Abstract:
A manufacturing method of a complex lens for a tandem scanning optical system that consists of a plurality of stacked lens portions and said lens portions converging a plurality of light beams, which are modulated independently and deflected by a deflector, onto a surface to be scanned, respectively, for forming a plurality of scanning lines at the same time, said method comprising:preparing molding dies for forming a cavity to form said complex lens as an integrally molded single-piece element; and injecting lens material into said cavity, wherein said molding dies include first and second single-piece mirror surface cores, each of the first and second single-piece mirror surface cores having a plurality of mirror surface portions, the plurality of mirror surface portions of the first single-piece mirror surface core respectively forming a plurality of lens surfaces at an incident side, the plurality of mirror surface portions of the second single-piece mirror surface core respectively forming a plurality of lens surfaces at an exit side.