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:
Dec. 13, 2011
Filed:
Oct. 23, 2008
Kazuo Watabe, Yokohama, JP;
Takashi Usui, Yokohama, JP;
Keiichiro Yusu, Yokohama, JP;
Chosaku Noda, Yokohama, JP;
Kazuto Kuroda, Yokohama, JP;
Nobuaki Kaji, Yokohama, JP;
Masahiro Saito, Yokohama, JP;
Kazuo Watabe, Yokohama, JP;
Takashi Usui, Yokohama, JP;
Keiichiro Yusu, Yokohama, JP;
Chosaku Noda, Yokohama, JP;
Kazuto Kuroda, Yokohama, JP;
Nobuaki Kaji, Yokohama, JP;
Masahiro Saito, Yokohama, JP;
Kabushiki Kaisha Toshiba, , JP;
Abstract
According to one embodiment, an optical recording head device includes a light source which outputs such a relaxation oscillation optical pulse that a full width at half maximum of a single pulse is 820 ps or less, a driving unit for driving the light source, an objective lens which converges emission light from the light source on a recording layer of a recording medium, and captures reflective light which is reflected by the recording layer of the recording medium, a distribution unit, placed between the light source and the objective lens, for distributing incident light, and a photodetection unit for receiving via the distribution unit the reflective light which is reflected by the recording layer of the recording medium, wherein a resonator length of the light source is 6560 μm or less.