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:
Oct. 27, 2009
Filed:
Mar. 12, 2007
Takashi Ohno, Yokohama, JP;
Masae Kubo, Yokohama, JP;
Michikazu Horie, Yokohama, JP;
Masaaki Mizuno, Yokohama, JP;
Hiroyuki Hoshino, Yokohama, JP;
Akio Okamuro, Tokyo, JP;
Takashi Ohno, Yokohama, JP;
Masae Kubo, Yokohama, JP;
Michikazu Horie, Yokohama, JP;
Masaaki Mizuno, Yokohama, JP;
Hiroyuki Hoshino, Yokohama, JP;
Akio Okamuro, Tokyo, JP;
Mitsubishi Kagaku Media Co., Ltd., Tokyo, JP;
Abstract
A rewritable optical recording medium includes a substrate and a phase-change type recording layer. A portion in a crystalline state corresponds to an unrecorded or erased state, and a portion in an amorphous state correspond to a recorded state, to record EFM modulated information by forming amorphous marks by irradiating the recording layer with a recording laser beam, and the recording is carried out by irradiating a recording laser beam having a wavelength of about 780 nm through an optical system having a numerical aperture NA of 0.5 or 0.55, at 24-times velocity or 32-times velocity of the reference velocity.