OBJEKTIVLINSENSYSTEM EINER AUFZEICHNUNGS/WIEDERGABE-VORRICHTUNG FUER OPTISCHE INFORMATION

摘要

An objective lens system consists of a converging lens 2 which has both surfaces formed of a convex aspherical surface and having a radius of curvature which is increased as it goes toward the periphery from the center thereof, and a chromatic aberration correcting element 1 having almost no power consisting of a positive and a negative lens cemented together. An optical disc OD is shown. <IMAGE>