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. 27, 2005
Filed:
Jun. 02, 2004
Kenzo Ishibashi, Moriguchi, JP;
Yasumori Hino, Ikoma, JP;
Yasuyuki Miyaoka, Yokohama, JP;
Hirotake Ando, Tokyo, JP;
Kenzo Ishibashi, Moriguchi, JP;
Yasumori Hino, Ikoma, JP;
Yasuyuki Miyaoka, Yokohama, JP;
Hirotake Ando, Tokyo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical disk is made of tracks that are magnetically separated from one another by scanning a focused light beam over lands between tracks at a predetermined power and annealing to lower the magnetic anisotropy of a magnetic layer on the lands, and is provided with a power testing region comprising one or more tracks for finding the predetermined annealing power at the location of at least one of the group consisting of a specific region within the data region, a region more to the inner side than the innermost track of the data region, and a region more to the outer side than the outermost track of the data region. Thus, an optical disk and a manufacturing method for the same can be provided that have a high recording density and with which annealing can be implemented in a short time and at the correct annealing width.