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:
Jan. 01, 2002
Filed:
Jul. 22, 1998
Takashi Yamaguchi, Tsuchiura, JP;
Katsuhiro Tsuneta, Odawara, JP;
Katsumoto Onoyama, Hiratsuka, JP;
Tsuyoshi Arai, Odawara, JP;
Yoshikatsu Fujii, Atsugi, JP;
Hidehiko Numasato, Odawara, JP;
Yosuke Hamada, Odawara, JP;
Masahito Kobayashi, Ushiku, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A sector servo type magnetic disk apparatus is provided with, in addition to servo signals, a sensor such as an accelerometer for detecting a state of a magnetic head or a support for the magnetic head at a period shorter than a sampling period of the servo signals. Since an accelerometer mounted on the magnetic head or the support for the magnetic head detects an acceleration, the control performance of a servo control system can be improved, such as reduction of generation of mechanism resonance vibrations of a carriage and improvement on detection precision of a speed signal.