Phase compensation method and optical storage apparatus

Details Phase compensation method and optical storage apparatus Phase compensation method and optical storage apparatus

2005-08-16

2005-08-16

Nguyen, Hoa T. (Department: 2652)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S047550, C369S112010

Reexamination Certificate

active

06930974

ABSTRACT:
A phase compensation method uses a phase plate to compensate for an optical phase of a reproduced signal in a reproducing optical system which is provided with respect to the reproduced signal from an optical recording medium. The position of the phase plate is controlled within a predetermined variable range depending on a type of the optical recording medium, so that a CNR of a reproduced signal becomes a maximum or, a DC fluctuation of the reproduced signal becomes a minimum or, a crosstalk level from adjacent tracks becomes a minimum.

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