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Disk apparatus and head positioning method

A technology for adjusting devices and driving devices, which is applied in the direction of transducing head devices, keeping the alignment of the head frame, and aligning the magnetic tracks on the magnetic disk, etc., which can solve problems such as temperature rise, difficulty in external force of the actuator, and instability of the positioning control system. The effect of improving positioning accuracy

Inactive Publication Date: 2005-02-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sampling frequency of the segment servo results in an upper limit of the control band
The existence of this upper limit makes it very difficult to correctly estimate the external force on the actuator
In addition, in actual use, it is extremely difficult to reduce the external interference on the actuator from the outside to the extent that there is no obstacle
As a result, it can be difficult to get the head to track the target trajectory correctly
[0009] On the other hand, in the resistance value of the drive coil of the actuator, there are cases where each drive coil has a deviation
In addition, when the driving current is passed through the driving coil, the temperature of the driving coil may rise due to heat generated by the driving coil, and the resistance value may fluctuate.
In this case, the error (deviation from the nominal value) of the resistance value of the driving coil makes the positioning control system including the external disturbance estimation device unstable

Method used

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  • Disk apparatus and head positioning method
  • Disk apparatus and head positioning method
  • Disk apparatus and head positioning method

Examples

Experimental program
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Embodiment approach 1

[0095] figure 1 It is a block diagram showing the configuration of a disk drive, which is an example of a disk drive as an embodiment of the present invention.

[0096] exist figure 1 Among them, the disk 1 is rotationally driven by a spindle motor (not shown). The magnetic head 2 is a portion for recording / reproducing data on the magnetic disk 1 and is attached to the front end of the arm 3 . As the arm 3 rotates around the bearing 4 , the magnetic head 2 moves toward a target track of the magnetic disk 1 . At the other end of the arm 3, a drive coil 5 is provided. The fixed piece 6 is formed by a pair of opposite yoke irons spaced apart from each other. A magnet (permanent magnet) not shown is fixed to at least one of the yokes corresponding to the gap. This magnet is arranged on the surface facing the drive coil 5 of the yoke. The interaction between the magnetic flux generated by the magnet disposed on the stator 6 and the magnetic field generated by the current pass...

no. 2 approach

[0211] Figure 13 for figure 1 A block diagram of a voltage signal conditioner 16 according to an embodiment of the present invention is shown.

[0212] Signal generator 61 produces reference signal, and this reference signal becomes suspected external disturbance signal ur, outputs to adder 17 (referring to figure 1 ). The external disturbance estimation signal τdest is input from the external disturbance estimator 12 into the amplitude holder 68 . The amplitude holder 68 holds the maximum value of the amplitude of the external disturbance estimation signal τdest, and generates the amplitude signal A every time a predetermined time passes. The amplitude signal A is output to the differential integrator 69, and the differential integrator 69 generates a correction signal ΔR on the basis of the amplitude signal A + . The driving signal u will be derived by the adder 17 + (=u+ur), utilize square box 66 to become the signal gmn u of gmn times + (=Ia), and the correction si...

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Abstract

A disk apparatus includes: an actuator 7; a driver 10; a voltage detector 11 for outputting first voltage signal Ed which is produced in a driving coil 5 of the actuator 7; a voltage signal adjuster 16 for outputting pseudo disturbance signal ur and generating second voltage signal Ed<+> from pseudo disturbance signal ur, driving signal u, first voltage signal Ed, and disturbance estimation signal taudest; a disturbance estimator 12 for estimating the magnitude of disturbance load taud applied to a magnetic head 2 from driving signal u and second voltage signal Ed<+> to output disturbance estimation signal taudest; a position detector 13 for generating position error signal e which corresponds to a current position of the magnetic head 2; a position controller 14 for generating control signal c from position error signal e; and a corrector 15 for generating driving signal u from disturbance estimation signal taudest and position control signal c.

Description

technical field [0001] The present invention relates to a disk device that uses an actuator to control the positioning of a recording / reproducing head such as a magnetic head or an optical pickup, and a control method thereof. Background technique [0002] In recent years, disk devices such as magnetic disk devices have been rapidly reduced in size and increased in capacity. For example, in order to increase the capacity of a magnetic disk device, there is a tendency to increase the magnetic disk track density and further reduce the track pitch. Therefore, in order to record and reproduce data on a magnetic disk, it is necessary to position a magnetic head on a target track formed with a narrow track pitch with high precision. [0003] Generally, in a magnetic disk device, servo information for head positioning is recorded in advance on a magnetic disk, and head positioning control is performed based on the servo information. That is, by reading the servo information with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/55G11B5/596G11B21/10
CPCG11B21/106G11B5/596G11B5/5582
Inventor 稻治利夫宫田敬三高祖洋梅田真
Owner PANASONIC CORP