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. 10, 2012
Filed:
Dec. 20, 2010
Kazuyo Umezawa, Yokohama, JP;
Seiji Morita, Yokohama, JP;
Koji Takazawa, Tokyo, JP;
Hideo Ando, Hino, JP;
Yasuaki Ootera, Yokohama, JP;
Naomasa Nakamura, Yokohama, JP;
Naoki Morishita, Yokohama, JP;
Kazuyo Umezawa, Yokohama, JP;
Seiji Morita, Yokohama, JP;
Koji Takazawa, Tokyo, JP;
Hideo Ando, Hino, JP;
Yasuaki Ootera, Yokohama, JP;
Naomasa Nakamura, Yokohama, JP;
Naoki Morishita, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, single-sided dual-layer recordable discmay be used. Information recording is performed by forming mark and space portions on data area DA using modulated laser power. Pp denotes the maximum laser power or peak power for forming the mark portion, and Pb denotes the bias power for forming the space portion. Power ratio Pb/Pp is calculated for each of recording layers Land L. Information is recorded on any of the recording layers Land Lbased on the result of calculation. Here, the calculated power ratio Pb/Pp changes among the recording layers Land L, thereby optimizing the recording condition for a multi-layer recordable optical disc within relatively short time.