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Disc drive apparatus with non-linear observer

A driving device and disk drive technology, applied in the field of controlling the parameters of the processor or equipment, and the radial position of the objective lens, can solve the problems that the gain cannot be increased infinitely, the control loop of the controller is unstable, etc.

Inactive Publication Date: 2008-01-16
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] A common problem with this is that the gain cannot be increased indefinitely; if the gain is set too high, the controller's control loop may become unstable

Method used

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  • Disc drive apparatus with non-linear observer
  • Disc drive apparatus with non-linear observer
  • Disc drive apparatus with non-linear observer

Examples

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Embodiment Construction

[0037] Figure 1A schematically illustrates an optical disc drive device 1 suitable for storing information on or reading information from an optical disc 2, typically a DVD or a CD. In order to rotate the disk 2 , the disk drive device 1 comprises a motor 4 fixed to a carriage (not shown for the sake of clarity), which motor 4 defines a rotation axis 5 .

[0038] The disk drive apparatus 1 also includes an optical system 30 for scanning a track (not shown) of the disk 2 with a light beam. In particular, in the configuration illustrated in Figure 1A, the optical system 30 includes a beam generating device 31 configured to generate a beam 32, typically a laser such as a laser diode. Hereinafter, characters a, b, c, etc. will be added to the reference numeral 32 to indicate different parts of the light beam 32 along the optical path 39 .

[0039] The light beam 32 reaches (beam 32 b ) the disc 2 via a beam splitter 33 , a collimator lens 37 and an objective lens 34 . The object...

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PUM

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Abstract

An optical disc drive apparatus (1) comprises: a read / write element (34) to be positioned with respect to the disc (2), and a detector (35) for generating a read signal (SR); actuator means (50) for controlling the positioning of said read / write element. A control circuit (90) receives said read signal and generates an actuator control signal (SCR), the control circuit having at least one variable gain (). Said control circuit, actuator means, read / write element, and detector define a control loop (100) having a critical frequency (cocp). A non- linear state estimator (350) is used to selectively set said gain () to a first value for signal components having a frequency in a predefined range corresponding to said critical frequency (COCP) and to a second value for signal components having a frequency outside said range, said first value being lower than said second value.

Description

technical field [0001] In general, the invention relates to the field of controlling parameters of a processor or device. In a particular application, the invention relates to the field of controlling the position of an object, in particular the radial position of an objective lens of an optical disc drive, and this application is set forth in detail in the following description. Note, however, that the present invention is not limited to this application. For example, the teachings of the present invention also apply to magnetic disks, and even more generally to the field of nonlinear control. Background technique [0002] As is well known, optical storage discs comprise at least one track, either in the form of a continuous spiral or in the form of a plurality of concentric circles, constituting a storage space in which information can be stored in the form of data patterns. Optical discs may be of the read-only type in which information is recorded during manufacture an...

Claims

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Application Information

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IPC IPC(8): G11B7/09G05B13/02
CPCG11B7/0948G05B13/04G11B7/0941G11B7/0956G11B7/0946G05B13/02G11B7/085G11B7/09
Inventor M·F·希尔特杰斯C·帕茨
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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