Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Head positioning controller, disk device cooperating same, and head positioning control method

A positioning control and controller technology, which is applied in the configuration/installation of recording heads, driving/moving recording heads, instruments, etc., and can solve problems such as non-tracking, deterioration of positioning accuracy, and resulting position errors.

Inactive Publication Date: 2004-05-26
PANASONIC CORP
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, if the absolute velocity is used for feedback control, since the head comes to a standstill after reaching a predetermined target position, if there is a slight curvature in the disk track, the head cannot follow the curvature.
Therefore, the result is prone to position errors
[0026] Third, in the case where the observer estimates and compensates for the force disturbance applied to the actuator based on the velocity signal, if the relative velocity between the head and the disk is not used, the movement itself for head tracking by positioning control becomes a disturbance vibration , by performing force disturbance estimation compensation, sometimes the positioning accuracy deteriorates

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Head positioning controller, disk device cooperating same, and head positioning control method
  • Head positioning controller, disk device cooperating same, and head positioning control method
  • Head positioning controller, disk device cooperating same, and head positioning control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0077] figure 1 is a block diagram showing the configuration of the head positioning control device according to Embodiment 1 of the present invention.

[0078] figure 1 Here, the center of a magnetic disk (hereinafter also simply referred to as a disk) 7 as a disk-shaped information recording medium is held as a rotation center, and the rotation is controlled by a rotation control mechanism such as a spindle motor, for example. A magnetic head (hereinafter referred to as head) 12 for recording and reproducing information on the disk 7 is integrally formed at the front end of the head slider 13 . The head slider 13 is mounted on the front end of the head support mechanism 14 . The head support mechanism 14 is driven by the actuator 50 around the rotation shaft 140 to perform the movement operation of the head 12 . The actuator 50 is provided with a voice coil motor (also referred to as a VCM) as a driving means, and the VCM moves the head 12 at the front end of the head s...

Embodiment approach 2

[0129] Figure 13 It is a block diagram showing the configuration of the head positioning control device according to Embodiment 2 of the present invention.

[0130] Figure 13 In the embodiment, the mechanism configuration of the control unit 102 is the same as that of the first embodiment, so the description thereof will be omitted here. In addition, to the same constituent elements as in Embodiment 1, the figure 1 and so on for the same sign.

[0131] However, unlike the basic control unit 200 in Embodiment 1, the basic control unit 202 included in the control unit 102 does not need to have the speed detector 3 . The sensor head position signal x is input to the estimated speed corrector 5 as it is. In addition, the difference from Embodiment 1 is that the counter electromotive force detector 4 generates the estimated moving speed signal V based on a continuous (analog) signal from the actuator 50 constituted by a driving device such as a VCM. e2 , and the integrated ...

Embodiment approach 3

[0134] Figure 14 is a block diagram showing the configuration of the head positioning control device according to Embodiment 3 of the present invention.

[0135] Figure 14 In the present invention, the mechanism configuration of the control unit 103 is the same as that of Embodiments 1 and 2, so description thereof will be omitted here. In addition, to the same constituent elements as in Embodiment 1, the figure 1 and so on for the same sign.

[0136] Unlike Embodiment 1, in the control unit 103, the estimation controller 6 only corrects the estimated speed signal V e2 ’ is set as the input signal, and the control value signal U is not input, and the estimated speed signal V is corrected. e2 ’ multiplied by the speed feedback gain K v , output speed control signal U v .

[0137] In addition, the position controller 2 equipped in the basic control unit 203 multiplies the position error signal e, which is the difference between the detection head position signal x and ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A head positioning system includes: a positioning mechanism section 1 for positioning a head 12; a position controller 2 for detecting a head position signal x to output a position control signal Ux; a velocity detector 3 for detecting the relative velocity of the head 12 with respect to a disk 7 based on the head position signal x; a counter electromotive voltage detector 4 for outputting an estimated head velocity signal Ve2 that is obtained by estimating the absolute velocity of the head 12 based on a counter electromotive voltage signal Vs of an actuator 50; an estimated velocity corrector 5 for correcting an estimation error of the estimated head velocity signal Ve2 based on a velocity signal detected from the head position signal x so as to output a corrected estimated velocity signal Ve2'; and an estimation controller 6 for outputting a velocity control signal Uv based on the corrected estimated velocity signal Ve2', wherein the actuator 50 is controlled by a control amount signal U that is obtained by adding at least the velocity control signal Uv to the position control signal Ux.

Description

technical field [0001] The present invention relates to a disk device using a disk-shaped information recording medium, such as a magnetic disk device or an optical disk device, a head positioning control device and a head positioning control method thereof. Background technique [0002] In recent years, along with the development of multimedia, there has been a strong demand in the market for high-recording-density disk devices capable of recording or reproducing large-capacity video information, audio information, character information, and the like at high speed. Among magnetic disk devices, magnetic disk devices in particular are characterized by so-called cheapness, small size, large capacity, and high-speed data transfer. The magnetic disk device is being used not only for personal computers (hereinafter abbreviated as PC), but also in the field of AV (Audio-Visual) and the field of automotive electronics. In addition, the use in so-called mobile fields such as mobile...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/55
CPCG11B5/5526
Inventor 高祖洋稻治利夫
Owner PANASONIC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com