Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1997-06-04
1998-06-16
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369124, 369 48, G11B 700
Patent
active
057682321
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.
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patent: 5719847 (1998-02-01), Tateishi et al.
Inoue Akiyoshi
Muramatsu Eiji
Taniguchi Shoji
Pioneer Electronic Corporation
Tran Thang V.
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