Optical disk apparatus having a focusing error correcting system

Details Optical disk apparatus having a focusing error correcting system Optical disk apparatus having a focusing error correcting system

1991-08-07

1994-01-18

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

052804640

ABSTRACT:
An optical system of an optical disk apparatus having plural optical elements characterized in that the optical element having aberration which can counterbalance the wave front aberration of the whole optical system is disposed, or a direction of aberration of each existing optical element is adjusted in order to correct the wave front aberration.

REFERENCES:
patent: 4643538 (1987-02-01), Wilson
patent: 4709139 (1987-11-01), Nakamura et al.
patent: 4805992 (1989-02-01), Maeda
patent: 4807212 (1989-02-01), Kaneda
patent: 4812638 (1989-03-01), Ogata et al.
patent: 4822151 (1989-04-01), Tatsuno
patent: 5121378 (1992-06-01), Hirose et al.

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