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:
Aug. 15, 2006
Filed:
Dec. 10, 2003
Atsushi Yamaguchi, Tokorozawa, JP;
Masahiro Kato, Tokorozawa, JP;
Eiji Muramatsu, Tokorozawa, JP;
Seiro Oshima, Yamanashi-ken, JP;
Takao Tagiri, Kofu, JP;
Atsushi Yamaguchi, Tokorozawa, JP;
Masahiro Kato, Tokorozawa, JP;
Eiji Muramatsu, Tokorozawa, JP;
Seiro Oshima, Yamanashi-ken, JP;
Takao Tagiri, Kofu, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
The present invention provides an optical recording medium, in which levels of wobble signals extracted from a recording area formed snakily, a reproduction exclusive area and an impossible area are maintained constant. On DVD-RW, groove tracks are snakily formed on a groove section on which recording information is recorded, and pit strings where a plurality of phase pits wave are arranged on the impossible area and the reproduction exclusive area which prevent illegal copying. On the respective areas, pit depths (groove depths), duty of the pit strings and wobbling amplitudes are set according to predetermined conditions so that the output levels of the wobble signals extracted based on the wobbling amplitudes can be maintained constant on the respective areas. As a result, synchronous control can be made accurately at the time of recording and reproduction on/from the DVD-RW.