Disk apparatus and disk access method employing counterelectromo

Details Disk apparatus and disk access method employing counterelectromo Disk apparatus and disk access method employing counterelectromo

1997-02-26

1998-10-13

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1100

Patent

active

058222812

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.

REFERENCES:
patent: 4955011 (1990-09-01), Baba
patent: 5012166 (1991-04-01), Ushigima et al.
patent: 5604719 (1997-02-01), Kahimoto et al.
patent: 5668787 (1997-09-01), Shigematsu et al.

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