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:
May. 30, 2006
Filed:
Aug. 04, 1999
Yasuyuki Mitsuoka, Chiba, JP;
Norio Chiba, Chiba, JP;
Nobuyuki Kasama, Chiba, JP;
Manabu Oumi, Chiba, JP;
Takashi Niwa, Chiba, JP;
Kenji Kato, Chiba, JP;
Hidetaka Maeda, Chiba, JP;
Yasuyuki Mitsuoka, Chiba, JP;
Norio Chiba, Chiba, JP;
Nobuyuki Kasama, Chiba, JP;
Manabu Oumi, Chiba, JP;
Takashi Niwa, Chiba, JP;
Kenji Kato, Chiba, JP;
Hidetaka Maeda, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
An information recording medium comprises a read-out track having a data region forming data bits for reproduced data and a servo pattern region forming servo bits for tracking control. The servo bits have a first groove that is deep in a direction perpendicular to both a length of the read-out track and a depth of the information recording medium, and a second groove that is deep in a direction opposite to the first groove and having a depth gradually increasing along the read-out track.