Information pick-up apparatus and optical disk apparatus

Details Information pick-up apparatus and optical disk apparatus Information pick-up apparatus and optical disk apparatus

1996-04-24

1998-05-19

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 58, G11B 700

Patent

active

057545138

ABSTRACT:
The present invention relates to an optical pick-up apparatus having a laser beam source and an objective lens to converge the luminous flux from the laser beam source onto the information recording surface of an optical information recording medium through a transparent substrate of the optical information recording medium such as CDs or DVDs, and specifically relates to a technology to move a divergence degree changing means such as a collimator lens or the like, in the direction of the optical axis, and/or to a technology to move the laser beam source in the direction of the optical axis, corresponding to the thickness of the transparent substrate of the optical information recording medium, in order to read information from plural types of optical information recording mediums having different transparent substrate thickness.

REFERENCES:
patent: 5097464 (1992-03-01), Nishiuchi et al.
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5499231 (1996-03-01), Fennema et al.

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