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. 03, 2004
Filed:
Aug. 08, 2001
Masahiro Kato, Tokorozawa, JP;
Eiji Muramatsu, Tokorozawa, JP;
Atsushi Yamaguchi, Tokorozawa, JP;
Shoji Taniguchi, Tokorozawa, JP;
Seiro Oshima, Yamanashi, JP;
Makoto Matsukawa, Yamanashi, JP;
Takao Tagiri, Koufu, JP;
Kazuhiro Yamato, Koufu, JP;
Tatsuhiro Yone, Tokorozawa, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A recording medium includes pairs of groove tracks and land tracks having periodically formed bent portion provided side by side on a substrate, a plurality of land prepits previously formed on the land tracks and carrying information about the groove tracks, and a recording layer formed on at least the groove tracks and the land tracks. The land prepits have a radius of mean curvature smaller than a radius of mean curvature of sides of the groove tracks in land-prepit absent regions of the land prepits and are defined by curved surfaces continuously extending from the sides of the groove tracks. Those sides of the groove tracks which face the continuous curved surfaces of the land prepits are curved surfaces that stricture the groove tracks. The depth of the land prepit is larger than that of the groove track.