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Disc recording method and system

A technology for optical disc recording and recording conditions, applied to optical recording systems, optical recording/reproducing/erasing methods, recording/reproducing/erasing methods, etc., capable of solving the problems of increased error rate, deterioration of jitter, and inability to erase well Rewritable disc pits and other issues

Inactive Publication Date: 2008-10-29
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case where data is rewritten by another optical disc recording system on a rewritable optical disc on which data is recorded by a certain optical disc recording system, pits formed on the rewritable optical disc cannot be well erased, Nor can new pits be formed to cover existing pits.
As a result, jitter deteriorates and error rates increase

Method used

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  • Disc recording method and system
  • Disc recording method and system
  • Disc recording method and system

Examples

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no. 1 example

[0093] An optical disc recording system according to a first embodiment of the present invention will be described below. Figure 8A and 8B is a schematic diagram showing the relationship between the recording area and the reproduction spot, where Figure 8A shows the relationship between the area recorded at the optimum recording power and the reproduced spot, while Figure 8B The relationship between the area recorded at a power higher than the optimum recording power and the reproduction spot is shown. Such as Figure 8A As shown, when data is recorded at an optimum power, the width of pits (portions where the recording layer is made amorphous by irradiating a laser beam onto the rewritable optical disc) is appropriately formed. Therefore, since the influence caused by the pits is small when the light spot is located on a land, the signal level reduction of the reflected light is also small. In the case of recording data with optimum recording power in this way, other t...

no. 2 example

[0109] Next, an optical disc recording system according to a second embodiment of the present invention will be described. 12A to 12C are views of pits recorded at different recording powers and reproduced waveforms of the respective pits. In FIG. 12A , pit a is a pit recorded by a strategy shorter than the optimum strategy at a recording power higher than the optimum recording power. Pit b is a pit recorded at an optimum recording power by an optimum strategy. The pit c is a pit recorded at a recording power lower than the optimum recording power by a strategy longer than the optimum strategy. As shown in FIG. 12A, the widths of pit a, pit b, and pit c have a relationship of Wa>Wb>Wc, and the lengths of pit a, pit b, and pit c have a relationship of La<Lb<Lc. . As shown in FIG. 12B, when the individual pits are reproduced, as the pit width becomes thicker, the peak-to-peak value (hereinafter referred to as "PP value") of the reproduction signal thus generated in relation t...

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Abstract

A crosstalk amount of a rewritable optical disk at an optimum recording power is stored, then the data recorded on the rewritable optical disk are reproduced upon overwriting the data on the rewritable optical disk, then a crosstalk amount in a reproduced signal is detected, and then this crosstalk amount is compared with a reference crosstalk amount. Since the crosstalk amount has such a characteristic that such crosstalk amount is increased larger as a width of a pit is thickened, i.e., a recording power is increased higher, it is possible to detect a recording power value by comparing the crosstalk amounts. As a result, the crosstalk amounts of both data are compared with each other by utilizing this characteristic, and then the recording conditions such as an erasing power, the recording power, etc. are changed in response to the compared result to overwrite the data.

Description

technical field [0001] The present invention relates to an optical disc recording method and an optical disc recording system for estimating recording conditions by reproducing original data recorded on the optical disc when data is rewritten on the rewritable optical disc, and then in response to the reproduced signal The data is recorded while the recording conditions are applied. Background technique [0002] As a rewritable optical disc, there are CD-RW, DVD-RW, DVD+RW, DVD-RAM, and the like. The recording characteristics of these discs vary according to their respective manufacturers, and even if rewritable optical discs manufactured by the same manufacturer are used, their recording characteristics vary according to their respective types. When writing data on a rewritable optical disc, generally, by detecting rewritable disc identification information (disc ID) recorded on the optical disc, and using OPC (Optimum Power Control: Optimum Recording Power Determining Ope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/006G11B5/09G11B7/00G11B7/0045G11B7/125G11B7/1267
CPCG11B7/1267G11B7/0062G11B7/00458
Inventor 刑部胜一本间保
Owner YAMAHA CORP