Optical head with objective lens having different numerical aper

Details Optical head with objective lens having different numerical aper Optical head with objective lens having different numerical aper

1997-11-18

2000-05-30

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369118, G11B 700

Patent

active

060698608

ABSTRACT:
The objective lens of the present invention includes a center portion and a periphery portion surrounding the center portion. An aberration of the periphery portion is corrected such that a light spot is formed by the convergence of a luminous flux which has been transmitted through the periphery portion and then transmitted through a first light transmissive flat plate, and an aberration of the center portion is corrected such that a light spot is formed by the convergence of a luminous flux which has been transmitted through the center portion and then transmitted through a second light transmissive flat plate which is thicker than the first light transmissive flat plate.

REFERENCES:
patent: 5097464 (1992-03-01), Nishiuchi et al.
patent: 5281797 (1994-01-01), Tatsuno et al.
patent: 5659533 (1997-08-01), Chen et al.
patent: 5665957 (1997-09-01), Lee et al.
patent: 5699341 (1997-12-01), Sugi et al.
patent: 5734637 (1998-03-01), Ootaki et al.
patent: 5745466 (1998-04-01), Kasahara
patent: 5761176 (1998-06-01), Takahashi
European Search Report for Application No. 97120197.5-2210-; Dated Apr. 6, 1998.

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