Back to results
US 2003/0151845 A1Published application
Head carriage assembly drive system and disk drive
AssigneeFujitsu Limited
InventorsSHINJI KOGANEZAWA, TOMOYOSHI YAMADA
Life of this patent
Estimating the term…
Abstract
A head carriage assembly drive system has a head carriage assembly having a head, a head carriage for moving the head in a radial direction of a rotating disk, a first drive unit for generating the power to rotate the head carriage and a second drive unit having a torque constant smaller than the torque constant of the first drive unit. Mainly the first drive unit is operated in a low-frequency band and mainly the second drive unit is operated in a high-frequency band, thereby reducing overall power consumption during tracking.
Claims12
A head carriage assembly drive system for driving a head carriage assembly when making a head track a track on a disk during a tracking operation, the head carriage assembly drive system comprising:
- a first drive unit for generating force to rotate a head carriage of the head carriage assembly, the first drive unit being provided, with respect to a pivot, on a side of the head carriage opposite a side on which a head is provided;
- a second drive unit positioned at a position other than a position at which the first drive unit is positioned, the second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and
- a control unit assigning mainly the first drive unit to operate in a low-frequency band and mainly the second drive unit to operate in a high-frequency band.
1 more element
A head carriage assembly drive system for driving a head carriage assembly when making a head track a track on a disk during a tracking operation, the head carriage assembly drive system comprising:
- a first drive unit for generating force to rotate a head carriage of the head carriage assembly, the first drive unit being provided, with respect to a pivot, on a side of the head carriage opposite a side on which a head is provided;
- a second drive unit positioned at a position other than a position at which the first drive unit is positioned, the second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and
- a control unit assigning the first drive unit to operate with respect to an eccentricity of the disk track and the second drive unit to operate with respect to other than an eccentricity of the disk track.
1 more element
A head carriage assembly drive system for driving a head carriage assembly when making a head track a track on a disk during a tracking operation, the head carriage assembly drive system comprising:
- a first drive unit for generating force to rotate a head carriage of the head carriage assembly, the first drive unit being provided, with respect to a pivot, on a side of the head carriage opposite a side on which a head is provided;
- a second drive unit positioned at a position other than a position at which the first drive unit is positioned, the second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and
- a control unit assigning the first drive unit to operate so as to supply a rotational force sufficient to offset a bias rotational force acting on the head carriage assembly, the second drive unit being driven to make the head follow the track on the disk.
1 more element
A head carriage assembly drive system for driving a head carriage assembly when making a head track a track on a disk during a tracking operation, the head carriage assembly drive system comprising:
- a first drive unit for generating force to rotate a head carriage of the head carriage assembly, the first drive unit being provided, with respect to a pivot, on a side of the head carriage opposite a side on which a head is provided;
- a second drive unit positioned at a position other than a position at which the first drive unit is positioned, the second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and
- a control unit assigning the first drive unit to detect a speed of movement of the head and assigning only the second drive unit to drive the head.
1 more element
A head carriage assembly drive system for driving a head carriage assembly when making a head track a track on a disk during a tracking operation, the head carriage assembly drive system comprising:
- a first drive unit for generating force to rotate a head carriage of the head carriage assembly, the first drive unit being provided, with respect to a pivot, on a side of the head carriage opposite a side on which a head is provided;
- a second drive unit positioned, with respect to the pivot, on a side opposite the first drive unit, the second drive unit having a torque constant smaller than a torque constant of the first drive unit and generating a force that is the reverse of a force generated by the first drive unit;
- and
- drive current sent to the first drive unit and drive current sent to the second drive unit, the values of the first and second drive unit currents being substantially inversely proportional to the torque constants of the first and second drive units.
1 more element
A head carriage assembly drive system for driving a head carriage assembly when making a head seek a target track on a disk during a seek operation, the head carriage assembly drive system comprising:
- a first drive unit for generating force to rotate a head carriage of the head carriage assembly, the first drive unit being provided, with respect to a pivot, on a side of the head carriage opposite a side on which a head is provided;
- a second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and
- a control unit assigning the second drive unit to detect a speed of movement of the head and assigning only the first drive unit to drive the head.
1 more element
A disk drive comprising:
- a head;
- a head carriage rotatably supported by a pivot for moving the head in a radial direction of a rotating disk;
- a first drive unit for generating force to rotate the head carriage, the first drive unit being provided, with respect to the pivot, on a side of the head carriage opposite a side on which the head is provided;
- a second drive unit positioned at a position other than a position at which the first drive unit is positioned, the second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and
- a control unit assigning mainly the first drive unit to operate in a low-frequency band and mainly the second drive unit to operate in a high-frequency band.
3 more elements
A disk drive comprising:
- a head;
- a head carriage rotatably supported by a pivot for moving the head in a radial direction of a rotating disk;
- a first drive unit for generating force to rotate the head carriage, the first drive unit being provided, with respect to the pivot, on a side of the head carriage opposite a side on which the head is provided;
- a second drive unit positioned at a position other than a position at which the first drive unit is positioned, the second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and a control unit assigning the first drive unit to operate with respect to an eccentricity of the disk track and the second drive unit to operate with respect to other than an eccentricity of the disk track.
2 more elements
A disk drive comprising:
- a head;
- a head carriage rotatably supported by a pivot for moving the head in a radial direction of a rotating disk;
- a first drive unit for generating force to rotate the head carriage, the first drive unit being provided, with respect to the pivot, on a side of the head carriage opposite a side on which the head is provided;
- a second drive unit positioned at a position other than a position at which the first drive unit is positioned, the second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and
- a control unit assigning the first drive unit to operate so as to supply a rotational force sufficient to offset a bias rotational force acting on the head carriage assembly, the second drive unit being driven to make the head follow the track on the disk.
3 more elements
A disk drive comprising:
- a head;
- a head carriage rotatably supported by a pivot for moving the head in a radial direction of a rotating disk;
- a first drive unit for generating force to rotate the head carriage, the first drive unit being provided, with respect to the pivot, on a side of the head carriage opposite a side on which the head is provided;
- a second drive unit positioned at a position other than a position at which the first drive unit is positioned, the second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and
- a control unit assigning the first drive unit to detect a speed of movement of the head and assigning only the second drive unit to drive the head.
3 more elements
A disk drive comprising:
- a head;
- a head carriage rotatably supported by a pivot for moving the head in a radial direction of a rotating disk;
- a first drive unit for generating force to rotate the head carriage, the first drive unit being provided, with respect to the pivot, on a side of the head carriage opposite a side on which the head is provided;
- a second drive unit positioned, with respect to the pivot, on a side opposite the first drive unit, the second drive unit having a torque constant smaller than a torque constant of the first drive unit and generating a force that is the reverse of a force generated by the first drive unit;
- and
- drive current sent to the first drive unit and drive current sent to the second drive unit, the values of the first and second drive unit currents being substantially inversely proportional to the torque constants of the first and second drive units.
3 more elements
A disk drive comprising:
- a head;
- a head carriage rotatably supported by a pivot for moving the head in a radial direction of a rotating disk;
- a first drive unit for generating force to rotate the head carriage, the first drive unit being provided, with respect to the pivot, on a side of the head carriage opposite a side on which the head is provided;
- a second drive unit having a torque constant smaller than a torque constant of the first drive unit;
- and
- a control unit assigning the second drive unit to detect a speed of movement of the head and assigning only the first drive unit to drive the head.
3 more elements
Dependencies are inferred from the claim text.