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Appliance for recording or playing back information having means for detecting or moving the scanning location

A technology of moving scanning and scanning position, applied in driving/moving recording head, recording/reproducing by optical method, using detectable carrier information, etc., can solve problems such as insufficient accuracy and speed

Inactive Publication Date: 2007-05-09
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accuracy and speed of this method is also insufficient for the requirements of a DVD drive

Method used

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  • Appliance for recording or playing back information having means for detecting or moving the scanning location
  • Appliance for recording or playing back information having means for detecting or moving the scanning location
  • Appliance for recording or playing back information having means for detecting or moving the scanning location

Examples

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Embodiment Construction

[0029] The inventive arrangement and the inventive method are intended for recording media with wobbled tracks, such as optical or magneto-optical disks, DVD+RW or other write-once or rewritable disc formats with wobbled tracks, hereinafter simply referred to as discs. Although the invention is mainly described below in connection with DVD+RW, this does not exclude the application of the invention to similar recording media having wobbled tracks.

[0030] Basically identical reference numerals are used in the figures.

[0031] By taking DVD+RW as an example, the design of a recording medium with wobbled tracks is schematically shown in Figs. 1-3.

[0032] DVD+RW is an optical recording medium in the form of a rewritable disc based on ECMA standard ECMA / TC31. The ECMA standard also reveals further details of the recording medium.

[0033] As shown in FIGS. 1 and 2 , DVD+RW has a wobble track formed by raising or lowering a side 4 that progresses sinusoidally on the disc 1 . ...

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PUM

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Abstract

The invention proposes an apparatus for recording or reproducing information, said apparatus having means for detecting or moving the position of a scanning device on a disc having a wobble track, said apparatus being capable of recording and unrecorded information on the disc. used in the area, and thus capable of being used in rewritable and write-once recording media having wobble tracks, the device additionally makes it possible to quickly determine the scan position without decoding the scan position information included in the wobble track. According to the present invention, a scanning device (2) is used to scan a wobble signal from a wobble track on a disk (1), and the wobble frequency (Fx) included in the wobble signal (WS) detected from the disk (1) is used to detect or move Scan the position of device (2). In this respect, the oscillation frequency (Fx) is related to the number of revolutions or rotational speed (Fd) of the disk (1) or to a oscillation frequency (Fx) known for the reference position (R0) on the disk (1), This makes it possible to detect or move the position of the scanning device without decoding the scanning position information included in the wobble signal (WS). In order to generate the wobble frequency (Fx) included in the wobble signal (WS), a circuit block (6) is provided, which includes a phase comparator (PD), a band-pass filter (LF), a voltage-controlled multivibrator (VCO) and digital phase shifter (DPS), and are used to generate the swing frequency signal (WS).

Description

technical field [0001] The invention relates to a device for recording or reproducing information having means for detecting or shifting the scanning position on a disc with wobbled tracks. The device has means for detecting and moving the scanning position of the scanning device on recorded and unrecorded areas of the disc, and is therefore suitable for rewritable and write-once recording media with wobbled tracks, and also also Allows detection of the current scan position during track jumps. Background technique [0002] Recording or playback of information that is stored or needs to be stored on a recording medium requires detection of a scanning position and movement of a scanning device for scanning the recording medium. Scanning devices used for recording or reproducing information are also often referred to as pickups. Various methods are known for position determination or localization of scanning devices. Information about the scanning position is stored on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/007G11B27/19G11B20/16G11B20/24G11B5/09G11B7/00G11B7/005G11B7/085G11B7/24082G11B21/08G11B27/10
CPCG11B7/0053G11B7/24082G11B7/08505
Inventor 彼得·马尔迈克尔·霍恩克
Owner THOMSON LICENSING SA
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