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:
Oct. 13, 1998
Filed:
Feb. 26, 1997
Motoyasu Yumita, Kanagawa, JP;
Sony Corporation, Toyko, JP;
Abstract
A disk apparatus according to the present invention includes a rotating means for rotating a disk, a head for accessing the disk, and a head moving means of moving the head in the radius direction of the disk. The head moving means includes a first voice coil motor as a drive source used when the head is moved, a second voice coil motor as a drive source used when the head is moved, a head guide means for guiding the head in the radius direction of the disk when the head is moved, a drive means for supplying a drive signal to the first voice coil motor during a first period in which the head is moved to a predetermined position on the disk and for supplying the drive signal to the first voice coil motor and the second voice coil motor during a second period in which the head is moved from the predetermined position on the disk to another position thereon, and a counterelectromotive voltage detecting means for detecting a counterelectromotive voltage from the second voice coil motor when the drive signal is not supplied to the second voice coil motor. The drive means drives the first voice coil motor based on an output from the counterelectromotive voltage detecting means so that the head should be moved to the predetermined position on the disk.