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:
Jun. 26, 2007
Filed:
Jan. 21, 2004
Tamotsu Iida, Tsuchiura, JP;
Toshinori Sugiyama, Tsukuba, JP;
Reiji Tamura, Moriya, JP;
Hideki Nagano, Yuki-Gun, JP;
Toshiaki Taii, Moriya, JP;
Yuji Yamazaki, Toride, JP;
Tamotsu Iida, Tsuchiura, JP;
Toshinori Sugiyama, Tsukuba, JP;
Reiji Tamura, Moriya, JP;
Hideki Nagano, Yuki-Gun, JP;
Toshiaki Taii, Moriya, JP;
Yuji Yamazaki, Toride, JP;
Hitachi Maxell, Ltd., Ibaraki-shi, JP;
Abstract
An optical disk includes a recording region formed on a substrate for recording user data, and a management region formed on the substrate which includes an identification information region for recording disk-specific identification information such as address information (ID), a SYNC code, or an error detection code (EDC). The identification information region in this optical disk has a flat portion (a mirror region) formed by means of sectioning part of a groove or a land in a given step. The disk-specific identification information is recorded on the identification information region inclusive of this mirror region as irreversible record marks. Moreover, a signal of the disk-specific identification information is detected by a laser beam which is servoed on the recording track of this optical disk. Then, a change in the detected signal level of the disk-specific identification information is detected based on a predetermined threshold level.