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:
Jul. 03, 2012
Filed:
Feb. 22, 2011
Atsuko Kosuda, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
Takashi Kikukawa, Tokyo, JP;
Hideki Hirata, Tokyo, JP;
Atsuko Kosuda, Tokyo, JP;
Motohiro Inoue, Tokyo, JP;
Takashi Kikukawa, Tokyo, JP;
Hideki Hirata, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An optical recording medium including recording and reading layers and a servo layer increases the recording capacity thereof. In the optical recording medium including the plurality of recording and reading layers and the servo layer, the servo layer has a groove and a land that can be used to perform tracking control with a long-wavelength servo beam. Information is recorded on the recording and reading layers with a recording and reading beam having a wavelength shorter than the wavelength of the servo beam. Recording marks are formed on the recording and reading layers while both the groove and land are tracked.