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Optical recording carrier and apparatus for scanning such recording carrier

A record carrier and optical recording technology, applied in the directions of optical record carriers, disc-shaped record carriers, and record carrier parts, etc., can solve the problem of large guard interval total bandwidth, etc., and achieve bandwidth reduction, improvement of signal-to-noise ratio, and simplified coding. Effect

Inactive Publication Date: 2004-12-08
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] A disadvantage of the prior art record carrier is that said two frequencies must have a relatively large difference, or frequency guard interval, in order to be able to distinguish them in the scanning device, thereby producing less noise between the two servo tracks. crosstalk
Therefore, the total bandwidth of the low frequency range, guard interval and high frequency range is relatively large

Method used

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  • Optical recording carrier and apparatus for scanning such recording carrier
  • Optical recording carrier and apparatus for scanning such recording carrier
  • Optical recording carrier and apparatus for scanning such recording carrier

Examples

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Embodiment Construction

[0029] FIG. 1 shows an embodiment of a record carrier 1 . Figure 1a is a plane graph, Figure 1b represents a fraction of a section taken along section line b-b, Figure 1c with Figure 1dBoth are plan views showing a portion 2 of the first and second embodiment of the record carrier 1 on an enlarged scale. The record carrier 1 comprises a set of servo tracks each forming a 360[deg.] helix, eight of which are shown in the figure. These servo tracks are formed, for example, from preformed grooves or lands. The servo tracks are used to record position information signals. For recording information, the record carrier 1 comprises a recording layer 6 deposited on a transparent substrate 5 and covered with a protective layer 7 . The recording layer is made of a radiation-sensitive material that undergoes optically detectable changes when exposed to suitable radiation. Such a recording layer may be, for example, a thin layer of material such as tellurium which changes reflect...

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Abstract

An optical record carrier (19) comprises a recording layer for recording information in a pattern of optically detectable marks in substantially parallel tracks. The tracks comprise alternating first and second servo tracks (20, 22). The servo tracks have a track modulation different from the information pattern and indicative of position information. The position information in the first servo tracks (20, 24) is encoded into m first words of channel bits and the position information in the second servo track (22, 26) is encoded into n second words of channel bits, where m and nare integers, and substantially all first and second words are different.

Description

technical field [0001] The invention relates to an optical record carrier comprising a recording layer for recording information in a pattern of optically detectable marks in parallel recording tracks comprising alternately formed first and second servo tracks, The servo track has a track modulation different from the information pattern and indicative of position information. [0002] The invention also relates to a method of scanning a record carrier having parallel tracks comprising alternately formed first and second servo tracks, the servo tracks having a recording different from the information pattern and indicating positional information channel modulation. [0003] The invention further relates to a scanning device for scanning said record carrier, comprising an optical system for scanning said first and second servo tracks with track modulation by means of a radiation beam, for detecting signals from the record carrier and a detector for modulating a radiation beam...

Claims

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Application Information

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IPC IPC(8): G11B7/007G11B7/0055G11B7/09G11B20/12G11B27/19G11B27/30
CPCG11B2220/2525G11B20/1217G11B27/3027G11B2220/20G11B27/19G11B2220/235G11B2220/216
Inventor G·J·范登恩登K·A·肖哈默伊姆明克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV