Development of anamorphic aspheric plastic lenses for high-speed digital copier

摘要

As a consequence of the remarkable diffusion of personal computers and information networks, demand has arisen for digital equipment with multiple functions. In line with this trend, Toshiba has introduced the PREMAGE 551/651 high-speed digital copier and printer, featuring a laser scanning optical system using four isolated semiconductor lasers. Anamorphic aspheric plastic lenses are utilized as important elements of the optical system. This paper comprehensively describes the manufacturing technology for these plastic lenses, centering around structural designs for molds, machining methods for mold inserts, and polymer processing.