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:
Apr. 10, 2012
Filed:
Aug. 07, 2009
Shigeo Nakamura, Odawara, JP;
Kimihiko Sudo, Yokohama, JP;
Toshinori Sugiyama, Ninomiya, JP;
Yasuhiro Matsuda, Ishioka, JP;
Yukio Yamamoto, Toride, JP;
Yoshihiro Sakurai, Hadano, JP;
Shigeo Nakamura, Odawara, JP;
Kimihiko Sudo, Yokohama, JP;
Toshinori Sugiyama, Ninomiya, JP;
Yasuhiro Matsuda, Ishioka, JP;
Yukio Yamamoto, Toride, JP;
Yoshihiro Sakurai, Hadano, JP;
Hitachi High-Technologies Corporation, Tokyo, JP;
Abstract
A magnetic head-positioning servo system is provided to accurately test a magnetic disk with a track written in advance, by providing two fine actuators. The second fine actuator, to which a magnetic head is attached, is mounted on the first fine actuator. The second fine actuator has a larger generating displacement than a generating displacement of the first fine actuator, and lets the magnetic disk to follow the eccentricity of the track. In this way, the positioning accuracy can be increased.