Control system and control method for positioning a head above a desired position on disk
US6771455B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 2000 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Mar 21, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5526
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is a control system designed to position a head provided in a magnetic disk drive. The system has a controller, a signal output section, two gain/phase control sections and an adder. The controller receives data generated from position data extracted from servo data and representing the position of the head and generates, form the data, an operation signal. The operation signal is used in seek control or track following control to move the head to a target position. The signal output section distributes the operation signal to the gain/phase control sections. The gain/phase control sections adjust the phase and gain of the operation signal, independently of each other, generating gain/phases. The operation signals are supplied to the adder. The adder adds the signals, generating a control signal that has a gain smaller than the gain of the operation signal. The control signal is input to the object which is provided in the magnetic disk drive and which is to be controlled. Mechanical resonance is prevented in the actuator incorporated in the disk drive. This minimizes seek noise and enhances operating stability of the disk drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.