Method for disk drive

A technology for disk equipment and control circuits, applied in the direction of instruments, support heads, drive/movement recording heads, etc., to solve problems such as large deviation of disk drives, difficult to return safely, and damage to the head assembly.

Inactive Publication Date: 2004-06-02
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, for the method of driving the magnetic head with a constant current, the current is proportional to the force and the force is proportional to the acceleration, so depending on the moving speed and position of the magnetic head when the power failure occurs, when toward the opposite direction of the stay (ramp) 106 When driving the magnetic head, it is difficult to ensure the collision speed of the magnetic head against the inner stopper of the arm 108, and the magnetic head assembly may be damaged
[0014] Depending on the moving speed and position of the magnetic head when the power failure occurs, the speed at which it approaches the strut (ramp) 106 will also deviate, and the arm 108 may contact the strut 106 at high speed and cause damage to the magnetic head assembly
In addition, due to the large deviation of the individual disk drives due to the deviation of the external force, it is difficult to design and ensure that the head is safely retracted (unloaded) at a speed that will not cause damage to the head assembly.

Method used

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  • Method for disk drive
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Examples

Experimental program
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Effect test

no. 1 example

[0058] figure 1 Having described the structure of the first embodiment of the magnetic disk device of the present invention, figure 2 Described figure 1 structure of the VCM driver, image 3 yes figure 1 Sectional view of the arm and ramp in, Figure 4 yes image 3 A top view of the arm and ramp in, Figure 5 Described figure 1 The structure of the controller in .

[0059] Such as figure 1 As shown, a disk drive 10 includes a magnetic disk 12, a spindle motor 14 for rotating the magnetic disk 12, an arm 16 having a head slider at the top, and a VCM (sound) for moving the arm 16 containing the head slider in the radial direction of the magnetic disk 12. circle motor) 18, and a ramp 20 provided on the outer circumference of the magnetic disk 12, on which the arm 16 retracts.

[0060] The VCM 18 includes a fixed magnet and a drive coil provided at the rear end of the arm 16 . The arm 16 includes a swing arm that rotates around a rotation axis 24 and an inner stoppe...

no. 2 example

[0090] Figure 9 The structure of the second embodiment of the disk drive of the present invention is described, Figure 10 Described Figure 9 The structure of the VCM driver in.

[0091] exist Figure 9 and Figure 10 in, with figure 1 The same components are denoted by the same reference numerals. In other words, if Figure 9 As shown, a disk drive 10 includes a disk 12, a spindle motor 14 that rotates the disk 12, an arm 16 with a head slider at its tip, and a VCM (Voice Coil Motor) for moving the arm 16 containing the head slider in the radial direction of the disk 12. 18, and a ramp 20 provided on the outer circumference of the disk 12, on which the arm 16 retracts.

[0092] The VCM 18 includes a fixed magnet and a drive coil provided at the rear end of the arm 16 . The arm 16 includes a swing arm that rotates around a rotation shaft 24 , and an inner stopper 22 for limiting the inner circumferential position of the arm 16 is provided on the VCM 18 . The struct...

no. 3 example

[0115] Figure 13 Having described the structure of the third embodiment of the magnetic disk device of the present invention, Figure 14 Described Figure 13 structure of the VCM driver, Figure 15 Described Figure 13 The structure of the local controller in .

[0116] exist Figure 13 in, with figure 1 and Figure 9 The same components are denoted by the same reference numerals. In other words, if Figure 13 As shown, a disk drive 10 includes a disk 12, a spindle motor 14 that rotates the disk 12, an arm 16 having a head slider at its tip, and a VCM (Voice Coil Motor) for moving the arm 16 including the head slider in a radial direction of the disk 12. 18, and a ramp 20 provided on the outer circumference of the disk 12, on which the arm 16 retracts.

[0117] The VCM 18 includes a fixed magnet and a drive coil provided at the rear end of the arm 16 . The arm 16 includes a swing arm that rotates around a rotating shaft 24 , and an inner stopper 22 for limiting the...

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Abstract

A head retracting method retracts a head to a retract position which is different from a disk to perform a stable unload operation when a power supply failure occurs, regardless the position and the velocity of the head. When the power supply failure occurs, controller controls that the head reaches the inner stopper, which is at a predetermined position in an opposite direction from, the ramp, so as to stop at the inner stopper at a predetermined position without receiving impact, regardless what position the head is and regardless what velocity the head is moving. The head is unloaded from the predetermined position by constant voltage driving, so the head contacts the ramp and climbs onto the ramp at a predetermined velocity.

Description

[0001] This application is based on and claims the benefit of priority from Japanese Patent Application No. 2002-328632 filed on November 12, 2002, the entire contents of which are incorporated herein by reference. technical field [0002] The present invention relates to a magnetic disk device, a magnetic head retracting method and a control circuit of a magnetic head actuator for retracting a magnetic head for reading / writing a magnetic disk to a storage position when a power failure occurs. Background technique [0003] In a disk drive, a magnetic medium (disk) is rotated during operation by a spindle motor, with a magnetic head suspended over the magnetic medium. If a power failure occurs in this state, a head retraction operation is performed. When a power outage occurs, the power supplied from the power supply to the drive of the VCM to move the head ceases, so the power to be used to retract the head must be from outside the power supply. [0004] An example of using...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/54G11B21/12G11B21/22
CPCG11B19/047G11B21/22G11B21/12G11B5/54
Inventor 铃木伸幸
Owner FUJITSU LTD
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