Objective lens for scanning optical disks (DVDS)

Details Objective lens for scanning optical disks (DVDS) Objective lens for scanning optical disks (DVDS)

2006-02-07

2006-02-07

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S796000, C369S112080, C369S112130

Reexamination Certificate

active

06995929

ABSTRACT:
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 n1having a value between 1.65 and 2, wherein the Abbe number V1of the first part and the Abbe number V0of the second part comply with the following relation (Formula I).

REFERENCES:
patent: 4938573 (1990-07-01), Saito

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