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:
Dec. 08, 2009
Filed:
Dec. 20, 2007
Shouji Nakajima, Kodaira, JP;
Masahide Yatsu, Akishima, JP;
Hideo Sado, Ome, JP;
Katsuki Ueda, Tachikawa, JP;
Toshitaka Matsunaga, Ome, JP;
Seiji Mizukoshi, Nishitama-gun, JP;
Shinichirou Kouhara, Hino, JP;
Shouji Nakajima, Kodaira, JP;
Masahide Yatsu, Akishima, JP;
Hideo Sado, Ome, JP;
Katsuki Ueda, Tachikawa, JP;
Toshitaka Matsunaga, Ome, JP;
Seiji Mizukoshi, Nishitama-gun, JP;
Shinichirou Kouhara, Hino, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, a servo writing apparatus that writes a multi-spiral servo pattern to a disk medium is disclosed. The apparatus has a servo controller that generates a servo clock determining a head seek start timing, a servo pattern generator that generates a sector index pulse determining the interval at which a multi-spiral servo pattern is written to the disk medium, a clock phase difference measuring unit that measures a phase difference between the servo clock and the sector index pulse, and a controller that adjusts the measured phase difference.