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. 06, 2009
Filed:
Apr. 26, 2007
Yukiko Hayashi, Kanagawa, JP;
Isao Yoneda, Kanagawa, JP;
Gaku Ikedo, Kanagawa, JP;
Nobuhisa Koide, Kanagawa, JP;
Yuhji Amari, Kanagawa, JP;
Yukiko Hayashi, Kanagawa, JP;
Isao Yoneda, Kanagawa, JP;
Gaku Ikedo, Kanagawa, JP;
Nobuhisa Koide, Kanagawa, JP;
Yuhji Amari, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., AZ Amsterdam, NL;
Abstract
Embodiments in accordance with the present invention provide a disk drive that ensures quieter rotational acceleration of a recording disk. Certain embodiments relate to a hard disk drive that detects the vibration of an enclosure by monitoring, via a driver, a counter electromotive voltage generated in a voice coil motor. If the hard disk drive detects a predetermined level of vibration or higher in the enclosure, it switches the status of a drive signal applied to a spindle motor so as to reduce the current level or smooth the waveform. This ensures reduced vibration of the enclosure.