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Device and method for use in optical record carrier systems

A technology of equipment and recording media, applied in the direction of optical recording/reproduction, data recording, recording information storage, etc., can solve problems such as poor performance, reduce the impact of vibration, improve equipment and methods, and cheap equipment and methods Effect

Inactive Publication Date: 2007-11-14
PHILIPS & LITE ON DIGITAL SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This poor performance is unacceptable for disc systems that are often subject to vibration, such as automotive applications

Method used

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  • Device and method for use in optical record carrier systems
  • Device and method for use in optical record carrier systems
  • Device and method for use in optical record carrier systems

Examples

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Embodiment Construction

[0033] According to a first aspect of the present invention, there is provided a signal processing device for controlling a focus actuator in an optical disc system. A signal processing device according to the invention will now be described with reference to two embodiments.

[0034] Fig. 3 illustrates a first embodiment of an optical disc system 30 in which a signal processing device 301 according to the invention is incorporated. Correspondingly, those skilled in the art should understand that the signal processing device 301 can be implemented in an optical disc system. Moreover, the optical disc system 30 will be described with reference to FIG. 3 only in respect of its parts relevant to the present invention.

[0035] Optical disc system 30 includes an optical disc player or recorder 302 having a motor 303 for rotating a recording medium 304 . The recording medium 304 is provided with pit tracks containing digital information. Recording medium 304 is preferably, but n...

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PUM

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Abstract

A signal-processing device (301) for controlling a focus actuator (309) in an optical disc system (30), wherein the signal processing device (309) generates a focus actuator control signal (CS) to be supplied to the focus actuator (309). The focus actuator control signal (CS) is based on a focus error signal (FE) and a central aperture signal (CA). If the central aperture signal (CA) is equal to or above a certain threshold value the focus actuator control signal will correspond to the focus error signal (FE). However, when the central aperture signal is below the threshold value the focus actuator control signal will have a predefined level. By providing a focus actuator control signal (CS) in accordance herewith it is possible to extend the regions of the focus error signal (FE) in which the relative distance between the focus point and the data layer of the record medium (304) is not correctly represented. The provision of the control signal (CS) enables improvements of the start-up and recovery performance of optical disc systems, especially under vibrating conditions.

Description

technical field [0001] The present invention relates generally, but not exclusively, to an apparatus and method for use in an optical disc system. In particular, it relates to a signal processing device for controlling a focus actuator in an optical disc system and a method of controlling a focus actuator in an optical disc system. The device and method provide an improved start-up and recovery performance behavior of an optical disc system, especially under the influence of vibrations. Background technique [0002] As one of the general recording media for audio information, video information, and data discs, from which recorded information is read with a light beam or on which information is written is widely used. Such optical discs, ie eg compact discs (CD) or digital versatile discs (DVD), are formed from a single plastic disc-shaped substrate. These optical discs store information as digital data on the disc and have a large storage capacity. The innermost portion o...

Claims

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Application Information

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IPC IPC(8): G11B7/09
CPCG11B7/0946G11B7/0945G11B7/09G11B20/10
Inventor R·J·E·默里M·莱斯特M·里克
Owner PHILIPS & LITE ON DIGITAL SOLUTIONS