Objective lens for scanning optical disks (DVDS)

摘要

An objective lens for scanning DVD and HD-DVD optical disks, comprising a first part and a second part, wherein said first part is shaped to comprise a first surface and an opposing second surface, said second part is shaped to comprise a third surface and an opposing fourth surface, said first surface is of a convex shape providing a main part of the lens power, said third surface is shaped to fit said first surface, and wherein said fourth surface is a generally aspherical surface, said second part being formed of synthetic resin material and said first part being formed of a material having a refractive index n₁ having a value between 1.65 and 2, wherein the Abbe number V₁ of the first part and the Abbe number V₀ of the second part comply with the following relation (Formula I).