Information reproducing apparatus for optical disc having a tilt

Details Information reproducing apparatus for optical disc having a tilt Information reproducing apparatus for optical disc having a tilt

1996-02-01

1997-10-07

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369124, G11B 700

Patent

active

056755643

ABSTRACT:
An information reproducing apparatus for reproducing information recorded on an information track formed on an information record surface of an optical disc, is provided with: a light irradiation device for irradiating the information record surface with a plurality of light beams including a first light beam, to which a coma aberration is not given, and at least one second light beam, to which a predetermined coma aberration for cancelling a coma aberration due to a tilt of the information record surface in a direction perpendicular to the information track is given, such that the first light beam and the second light beam form light spots arranged along the information track; a first photo-detector for detecting a first reflection light from the information record surface and generating a first light detection signal; a second photo-detector for detecting a second reflection light from the information record surface and generating a second light detection signal; a tilt detection device for detecting a tilt of the information record surface and outputting a tilt signal; and a selection device for selecting one of the first and second light detection signals which has a less coma aberration according to the tilt signal. The information is reproduced on the basis of the selected one of the first and second light detection signals.

REFERENCES:
patent: 5216649 (1993-06-01), Koike et al.
patent: 5430700 (1995-07-01), Kuribayashi et al.
patent: 5442615 (1995-08-01), Ohsato et al.

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