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:
Aug. 20, 2013
Filed:
Aug. 10, 2011
Yoshinori Ishikawa, Yokohama, JP;
Harukazu Miyamoto, Higashimurayama, JP;
Akemi Hirotsune, Odawara, JP;
Yoshinori Ishikawa, Yokohama, JP;
Harukazu Miyamoto, Higashimurayama, JP;
Akemi Hirotsune, Odawara, JP;
Hitachi Consumer Electronics Co., Ltd., Tokyo, JP;
Abstract
A multilayer optical disc which has three or more recording layers and enables easy positioning of a focused beam spot onto a particular recording layer in which a BCA is disposed. An inter-layer distance between a particular recording layer and a recording layer adjacent to the particular recording layer is larger than the other inter-layer distances in which, at the focused beam spot positioning, the focused beam spot traverses the said adjacent recording layer earlier than the other recording layer adjacent to the particular recording layer.