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:
Apr. 16, 2013
Filed:
Oct. 04, 2011
Kazuyo Umezawa, Yokohama, JP;
Seiji Morita, Yokohama, JP;
Koji Takazawa, Tokyo, JP;
Naomasa Nakamura, Yokohama, JP;
Naoki Morishita, Yokohama, JP;
Shinichi Katsuda, Yamato, JP;
Kazuyo Umezawa, Yokohama, JP;
Seiji Morita, Yokohama, JP;
Koji Takazawa, Tokyo, JP;
Naomasa Nakamura, Yokohama, JP;
Naoki Morishita, Yokohama, JP;
Shinichi Katsuda, Yamato, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An optical recording medium including a plurality of recording layers to record/reproduce information using light with a predetermined wavelength, the information being recorded on one of the recording layers using a mark and a space, wherein a channel clock period T is provided for recording the mark on one of the recording layers. A plurality of pulses, including a last pulse arranged at an end of the pulses, are used to record the mark with length 3T, the mark being recorded with a condition that a width of the last pulse is minimum 0T and maximum 1.10T, in which a first subsequent level lower than a peak power level of the last pulse is arranged next to the last pulse, and a second subsequent level lower than the peak power level but higher than the first subsequent level is arranged next to the first subsequent level.