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. 26, 2010
Filed:
Sep. 25, 2008
Yuko Kawaguchi, Ibaraki, JP;
Shinya Abe, Kadoma, JP;
Morio Tomiyama, Ikoma, JP;
Eiji Ohno, Hirakata, JP;
Yuko Kawaguchi, Ibaraki, JP;
Shinya Abe, Kadoma, JP;
Morio Tomiyama, Ikoma, JP;
Eiji Ohno, Hirakata, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical recording medium includes a main-information area in which a metal reflection film is formed on a substrate where a row of pits is formed as main data, and a sub-information area in which is recorded medium identification information, which is used to identify the optical recording medium individually, by removing the metal reflection film partially and forming a plurality of reflection-film removed areas. Information is reproduced by irradiating the metal reflection film with a beam of light. In the sub-information area, a row of pits or a guide groove is formed on the substrate, and a track pitch of the row of pits or the guide groove is at least 0.24 μm wide and at most 0.45 μm wide.