Objective lens unit and recording/reproduction apparatus

Details Objective lens unit and recording/reproduction apparatus Objective lens unit and recording/reproduction apparatus

1997-11-04

2000-08-15

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, G11B 700

Patent

active

061046914

ABSTRACT:
The present invention provides an objective lens unit which can be simultaneously adjusted to an NA specification and a substrate thickness of an optical recording medium.
The objective lens unit for applying a beam to an optical recording medium so as to read and/or record from/to the optical recording medium includes: a first lens; a second lens; a cylindrical frame for movably supporting the second lens with respect to the first lens in a direction of an optical axis; and diaphragm means provided in the vicinity of the second lens and movable together with the second lens in the direction of the optical axis, for shading a part of the beam to be applied to the optical recording medium.
The present invention also provides a recording/reproduction apparatus having the aforementioned objective lens unit, enabling to preferably write and read a data signal into/from an optical recording medium of different specifications.

REFERENCES:
patent: 5659533 (1997-08-01), Chen et al.
patent: 5699341 (1997-12-01), Sugi et al.

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