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:
Feb. 11, 2014
Filed:
Feb. 22, 2011
Hideki Hirata, Tokyo, JP;
Takashi Kikukawa, Tokyo, JP;
Atsuko Kosuda, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
Hideki Hirata, Tokyo, JP;
Takashi Kikukawa, Tokyo, JP;
Atsuko Kosuda, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A series of optical recording media is provided to reduce a burden on an optical pickup by introducing a standardized idea among a plurality of optical recording media. In the series of optical recording media, optical recording media are of a plurality of types, each optical recording medium including a plurality of planar recording and reading layers with no projections and depressions for tracking control, and a servo layer with projections and depressions for tracking control. The plurality of optical recording media have different numbers of stacked recording and reading layers, and the positions of the servo layers with respect to the corresponding light incident surfaces are standardized among the plurality of optical recording media.