Invention Grant
- Patent Title: Optical information storage medium reproduction apparatus and control method of the same
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Application No.: US12814111Application Date: 2010-06-11
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Publication No.: US08411538B2Publication Date: 2013-04-02
- Inventor: Masaki Yamamoto , Hirohisa Yamada , Yasuhiro Harada , Go Mori , Hideharu Tajima , Shigemi Maeda , Yoshiteru Murakami
- Applicant: Masaki Yamamoto , Hirohisa Yamada , Yasuhiro Harada , Go Mori , Hideharu Tajima , Shigemi Maeda , Yoshiteru Murakami
- Applicant Address: JP Osaka
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JP Osaka
- Agency: Edwards Wildman Palmer LLP
- Agent David G. Conlin; Stephen D. LeBarron
- Priority: JP2007-273204 20071019
- Main IPC: G11B7/00
- IPC: G11B7/00 ; G11B7/24

Abstract:
In an optical information storage medium reproduction apparatus (10) for reproducing an optical information storage medium including a plurality of information recording layers each including a recording mark having a length shorter than an optical system resolution limit, reproduction laser power for reading an information recording layer closest to a reproduction-laser-incident surface of the optical information storage medium is set to be lower than reproduction laser power for reading an information recording layer farthest from the reproduction-laser-incident surface but not lower than minimum reproduction laser power that satisfies a reproduction signal characteristic that the optical information storage medium reproduction apparatus (10) requires. With the arrangement, it is possible to prevent that the information recording layer closest to the reproduction-laser-incident surface is irradiated wrongly with reproduction laser having high reproduction laser power, thereby making it possible to obtain successful reproduction quality. That is, it is possible to realize the optical information storage medium reproduction apparatus (10) that can set optimum reproduction laser power and perform stable super resolution reproduction.
Public/Granted literature
- US20100246344A1 OPTICAL INFORMATION STORAGE MEDIUM REPRODUCTION APPARATUS AND CONTROL METHOD OF THE SAME Public/Granted day:2010-09-30
Information query
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