Device for recording or reproducing information on an optical re

Details Device for recording or reproducing information on an optical re Device for recording or reproducing information on an optical re

1995-11-02

1998-05-19

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 7095

Patent

active

057545049

ABSTRACT:
A device for recording and reproducing on an optical information recording medium, includes a light source composed of a semiconductor laser to emit a divergent luminous flux; an objective lens to receive the divergent luminous flux and to converge the divergent luminous flux onto the optical information recording medium; and a tracker for tracking a converged luminous flux on the optical information recording medium by moving the objective lens in a direction perpendicular to an optical axis. The objective lens has an astigmatism so that a quantity of the astigmatism of a wavefront emitted from the objective lens shows a minimum value at a position where the objective lens is moved in the direction perpendicular to the optical axis by a tracking operation of the tracker.

REFERENCES:
patent: 4782474 (1988-11-01), Arai et al.
patent: 4789978 (1988-12-01), Shikama et al.
patent: 4842388 (1989-06-01), Tanaka et al.
Patent Abstracts of Japan, vol. 7, No. 127, (P-201), Jun. 3, 1983 & JP 58-45629.
Shigeo Kubota, An Analysis of Eye Diagram Phase Jitter in Optical Disk Systems III, Japanese Journal of Optics, Apr., 1985, vol. 14, pp. 140(64)-143(67).

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