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:
Nov. 16, 1999
Filed:
Mar. 25, 1997
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, Ibaraki-ken, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An apparatus for positioning a magnetic head includes a servo signal detection circuit for detecting a servo signal recorded on a magnetic disk in a predetermined first period, an acceleration measuring portion which is fitted to a part of a mechanism for mounting a magnetic head, outputs an acceleration signal in a direction of positioning the magnetic head, and samples the acceleration signal in a second period shorter than the first period, a comparison processing portion for comparing a deviation value computed from at least either one of the acceleration signal and the servo signal with a predetermined value, a write inhibit signal generating portion for generating a signal inhibiting write of data on a magnetic disk in accordance with the result of comparison in the comparison processing portion, and a manipulated variable compensation portion for generating manipulated variable for adjusting the position of the magnetic head from at least either one of the servo signal and the acceleration signal and a target value of the position of the magnetic head, whereby to prevent erroneous write operation of data onto a magnetic disk due to unsteady positioning error of the magnetic head.