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. 26, 2009
Filed:
Jun. 07, 2007
Masashi Kisaka, Kanagawa, JP;
Masashi Kisaka, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments in accordance with the present invention provide a magnetic disk drive capable of alleviating an adverse effect of vibrations inherent to a housing on positioning control, reducing the adverse effect over other frequency range, and stabilizing the positioning control. In a magnetic disk drive according to embodiments of the present invention, a position control circuit that controls the position of a magnetic head produces a signal, based on which the position of the magnetic head is controlled, according to positional information read by the magnetic head. The signal is transmitted via a multi-rate filter circuit that decreases a sensitivity function relevant to a predetermined object frequency by a first predetermined gain, and suppresses an increase in the sensitivity function relevant to frequencies lower than the object frequency to a second predetermined gain.