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:
Feb. 17, 2009
Filed:
Jun. 01, 2005
Tsuyoshi Yamamoto, Osaka, JP;
Katsuki Hattori, Osaka, JP;
Masato Fuma, Osaka, JP;
Yutaka Yamanaka, Tokyo, JP;
Tatsunori Ide, Tokyo, JP;
Shigeru Shimonou, Tokyo, JP;
Yutaka Kashihara, Kanagawa, JP;
Akihito Ogawa, Kanagawa, JP;
Hideki Takahashi, Chiba, JP;
Tsuyoshi Yamamoto, Osaka, JP;
Katsuki Hattori, Osaka, JP;
Masato Fuma, Osaka, JP;
Yutaka Yamanaka, Tokyo, JP;
Tatsunori Ide, Tokyo, JP;
Shigeru Shimonou, Tokyo, JP;
Yutaka Kashihara, Kanagawa, JP;
Akihito Ogawa, Kanagawa, JP;
Hideki Takahashi, Chiba, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
NEC Corporation, Tokyo, JP;
Abstract
Data is recorded on an optical disc using a combination of a user data area where user data is recorded, a control data area for reproduction provided on an inner radius side of the user data area, and an outer guard zone provided on an outer radius side of the user data area as a unit of one recording operation. In this configuration, a track pitch TP of the optical disc is greater than or equal to 0.3 μm and smaller than or equal to 0.4 μm, and the width of the outer guard zone along a radius direction of the optical disc is greater than or equal to a value of (100×TP) and smaller than or equal to a value of (125×TP).