The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2014
Filed:
Jan. 15, 2013
Sharp Kabushiki Kaisha, Osaka, JP;
Masaki Yamamoto, Osaka, JP;
Hirohisa Yamada, Osaka, JP;
Yasuhiro Harada, Osaka, JP;
Go Mori, Osaka, JP;
Hideharu Tajima, Osaka, JP;
Shigemi Maeda, Osaka, JP;
Yoshiteru Murakami, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In an optical information storage medium reproduction apparatus 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 requires.