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. 21, 2007
Filed:
Nov. 05, 2003
Masahiro Kato, Saitama, JP;
Tatsuhiro Yone, Saitama, JP;
Atsushi Yamaguchi, Saitama, JP;
Eiji Muramatsu, Saitama, JP;
Shoji Taniguchi, Saitama, JP;
Toshihiko Takishita, Yamanashi, JP;
Seiro Oshima, Yamanashi, JP;
Takao Tagiri, Yamanashi, JP;
Masahiro Kato, Saitama, JP;
Tatsuhiro Yone, Saitama, JP;
Atsushi Yamaguchi, Saitama, JP;
Eiji Muramatsu, Saitama, JP;
Shoji Taniguchi, Saitama, JP;
Toshihiko Takishita, Yamanashi, JP;
Seiro Oshima, Yamanashi, JP;
Takao Tagiri, Yamanashi, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A groove track and a land track are alternately and spirally formed on an information recording medium. On the land track neighboring the groove track, pre-information indicating position information of a track on a disc is formed as a prepit. On the information recording medium, an embossed area is formed so that information about a copyright and for preventing an illegal copy cannot be rewritten. In the embossed area, an embossed configuration including a pit and a space of predetermined depths is formed. The prepit in the embossed area is formed so that the prepit has an optimized configuration according to a pit length and a space length in the embossed area which the prepit neighbors. Consequently, interference between the embossed configuration and the prepit can be prevented even in a case that the prepit is formed in addition to the embossed configuration in the embossed area.