Head positioning system for positioning a magnetic head on an eccentric target track
AssigneeNEC Corporation
InventorTakahiko Tsujisawa
Life of this patent
Estimating the term…
Abstract
A head positioning system for driving a magnetic disk from its current track to a target track in the radial direction of a magnetic disk. The positioning system employs a closed loop servo system including a compensation digital filter for generating a compensation signal whose frequency is synchronized with a higher frequency component of the track eccentricity. The system is effective in positioning the magnetic head at the center line of a target track with a high degree of accuracy even if the track is eccentric and in increasing the track density of the disk.
Claims7
A head positioning system for positioning a magnetic head at a target track of a magnetic disk which rotates at a disk rotational frequency, comprising:
- a drive motor for driving said magnetic head in a radial direction of said magnetic disk, a position error detector for generating a position error signal which indicates a deviation of said magnetic head with respect to a center line of said target track, a compensation digital filter for generating a compensation signal having a frequency equal to an integer multiple of said disk rotational frequency, a stabilization digital filter connected to said position error detector and said compensation digital filter for generating an equilibrium point signal of said drive motor in accordance with said position error signal and said compensation signal, a motor driver for determining drive currents for said drive motor in response to said equilibrium point signal, and means for detecting a position of said magnetic head relative to said center line of said target track and for supplying the head position signal to said position error detector.
Dependencies are inferred from the claim text.