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. 01, 2005
Filed:
Nov. 25, 2002
Ryuichi Onda, Kawasaki, JP;
Naotoshi Katahara, Kawasaki, JP;
Eiichi Ebihara, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A disk unit for writing data in a given position on a disk and reading data written in the given position on the disk by using a head includes a temperature control unit for controlling a temperature of a body of the disk unit by heating or cooling the body of the disk unit. The disk unit detects the temperature dependence of a characteristic of a rotary mechanism unit including at least a spindle motor and a voice coil motor, based on position information included in servo information reproduced from the head or a value of a current of the spindle motor, and compares the detected characteristic with a predetermined value, and operates the temperature control unit, when the characteristic has been degraded, so as to suppress the degradation of the characteristic. A temperature control method, of the disk unit, by operating an MPU, or the like, of a computer is provided.