Objective lens having a doublet lens with high numerical apertur

Details Objective lens having a doublet lens with high numerical apertur Objective lens having a doublet lens with high numerical apertur

1997-10-24

2000-05-02

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4432, 359365, 359796, G11B 700, G02B 302

Patent

active

06058095&

ABSTRACT:
An objective lens having a doublet structure and a number of apertures of 0.7 or more and an optical pickup apparatus having the objective lens to be adaptable to a optical recording medium having a high information recording density, the objective lens being structured such that at least one side is formed into a aspheric surface and the lens elements are made of low-diffusion glass having an Abbe's number of 40 or greater.

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