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:
Sep. 18, 2012
Filed:
Feb. 21, 2006
Nobuo Takeshita, Tokyo, JP;
Noboru Yashima, Tokyo, JP;
Masaharu Ogawa, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
The present invention relates to optical disks and optical disk devices, and has an object to reduce access time and prevent malfunction. To attain the above object, in an optical disk (), a management information area () is placed inside a user data area (), namely, at the innermost circumference position of the optical disk (), in an information layer () placed at the farthest position from the surface. A position information area () that stores position information indicating the position of each information layer in a thickness direction of the optical disk () is placed in the management information area ().