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Method for recording data on optical record carrier

A technology for optical recording and data recording, which is applied to optical recording carriers, optical recording/reproducing/erasing methods, optical recording systems, etc., and can solve problems such as tracking control damage, focus control and data reproduction operations being affected

Inactive Publication Date: 2008-08-13
PANASONIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if the rotational speed of the record carrier is 1800rpm, a strong inter-track signal correlation of only a few millimeters at a 35mm radial position can disrupt tracking control
[0020] Although the consistent data patterns and narrowly spaced traces that create strong correlation and crosstalk between adjacent traces are useful for tracking control, they also have implications for focus control and data reproduction operations

Method used

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  • Method for recording data on optical record carrier
  • Method for recording data on optical record carrier
  • Method for recording data on optical record carrier

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0070] In FIG. 5 there is shown a recording apparatus according to the invention for recording randomized data on a sector Sm of an optical disc RC'. This disc RC' is figure 1 A modification of the optical disc RC, it is a data writable (rewritable) medium. The data format and track structure of the two optical discs RC and RC' are basically the same.

[0071] The recording unit WA includes a disk motor 102 for supporting and rotating figure 1The disc RC'. An optical head 104 optically writes data on the optical disc RC'. The optical head 104 includes a light source 104a, a light modulator 104b, a focusing unit 104c, a half mirror 104d, and a photodetector 104e.

[0072] The light source 104a emits a light beam Ls to the optical disc RC' through the light modulator 104b, the half mirror 104d, and the focusing unit 104c. The light modulator 104b is driven by the light modulator driver 110 so as to modulate the intensity of the light or its emission angle to prevent the l...

no. 2 example

[0170] Refer to the following Figure 14 and 15 The recording apparatus and reproducing apparatus according to this embodiment will be described. It should be noted that the recording apparatus WA and the reproducing apparatus RA according to this embodiment differ from those in the first embodiment only in the data formatter and data deformatter. Therefore, a detailed description of parts of these devices other than the data formatter and data deformatter is omitted for the sake of brevity.

[0171] exist Figure 14 expressed in Figure 6 A variant of the data formatter 122. Another data formatter 122R according to this embodiment includes the same components as the data formatter 122, but the positions of the ECC check byte generator 503 and the scrambler 504 are reversed. Specifically, as clearly shown in FIG. 9, in this data formatter 122R, an ECC check byte generator 503 is connected to a scrambler 504, which in turn is connected to a header data generator 502.

[0...

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Abstract

An optical record carrier and methods and apparatuses for recording and reproducing an information on and from said optical recording carrier, whereby the effects of crosstalk from adjacent tracks is reduced, and stable tracing control is possible, is achieved. A recording track to which information divided into sector units is recorded is formed in a spiral or concentric pattern on the surface of the optical record carrier. Each sector further comprises sixty frames. Each frame comprises a re-sync pattern, frame address, data, and postamble fields. Identification information identifying the sector location of the information is recorded to the data block of the first frame. The user data is recorded after the data is scrambled using a value generated by a fifteen-stage maximum-length sequence generator based on the value of this identification information. The correlation between signals on adjacent tracks is thus reduced, and the effects of crosstalk are randomized, thus reducing the effect on the track error signal and enabling extremely stable tracking control.

Description

technical field [0001] The invention relates to an optical record carrier from which information is read out by emitting a focused beam of light, and to a method of recording a signal thereon and reproducing a recorded signal therefrom. Background technique [0002] As a storage medium for audio information data, video information data and other types of data, read-only optical record carriers (hereinafter referred to as "record carriers") have become more and more important because of their capacity to store large Information for future reproduction. However, the demand for larger storage capacities and smaller device sizes continues to increase, thus necessitating further increases in the data recording density of record carriers. [0003] A customary record carrier of this type is a disc-shaped recording medium having a resin substrate, on the surface of which are formed spiral or concentric data tracks consisting of pits and lands. A reflective film, for example made o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/007G11B7/09G11B20/10G11B7/004G11B7/0045G11B7/005G11B7/013G11B20/12G11B20/18G11B20/22G11B27/30
CPCG11B7/0045G11B20/22G11B7/005G11B20/10G11B7/013G11B7/00745G11B20/1217G11B27/3027
Inventor 守屋充郎田中伸一平山康一
Owner PANASONIC CORP
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