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Optical disc recording method and optical disc recorder

A technology for recording and recording marks on optical discs, applied in optical recording/reproduction/erasing methods, optical recording systems, recording/reproduction with optical methods, etc., can solve problems such as unrealizable and complicated recording systems, and achieve simplification of control circuits Effect

Inactive Publication Date: 2014-07-23
HITACHI CONSUMER ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is necessary to classify the parameters of the recording pulses by the length of the preceding mark in addition to at least the length of the mark and the length of the preceding space. In the laser pulse controller, there is a problem that it cannot be realized and the recording system becomes complicated

Method used

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  • Optical disc recording method and optical disc recorder
  • Optical disc recording method and optical disc recorder
  • Optical disc recording method and optical disc recorder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] A structural example of an optical disc device suitable for carrying out the present invention will be described. Here, the BD system is assumed. Figure 11 It is a schematic diagram showing a configuration example of an optical disc device to which the present invention is applied. The optical disc medium 100 mounted in the device is rotated by the spindle motor 160 . During reproduction, the laser power / pulse controller 120 controls the current flowing through the semiconductor laser 112 via the laser driver 116 in the optical head 110 to generate laser light 114 in order to achieve the light intensity instructed by the CPU 140 . The laser light 114 is condensed by the objective lens 111 to form a light spot 101 on the optical disc medium 100 . Reflected light 115 from this light spot 101 is detected by a photodetector 113 via an objective lens 111 . The photodetector is composed of a plurality of photodetection elements. The reproduction signal processing circuit...

Embodiment 2

[0119] use Figure 13A ~ Figure 13C as well as Figure 14 Another embodiment of the cooling pulse width adjustment method will be described. The structure of the device is the same as in Example 1.

[0120] In this embodiment, the absolute value of the edge displacement of the front edge of the mark classified by the combination of the length of the mark and the length of the space immediately before the mark is determined to be approximately the minimum by the conventional method. At the time of the start of the first pulse classified by the combination of the length of the mark and the length of the space immediately before the mark, the distribution of edge shifts of the entire mark is averaged to zero, and then the edge shifts classified by the length of the preceding mark are shifted Adjust the pulse width of the cooling pulses for each mark length in such a way that the respective distributions average to zero. Figure 13A ~ Figure 13C is a schematic diagram illustrat...

Embodiment 3

[0124] use Figure 15A ~ Figure 15C as well as Figure 16 Another embodiment of the cooling pulse width adjustment method will be described. The structure of the device is the same as in Example 1.

[0125] In this embodiment, first, the average of the distribution with the smallest edge displacement is made zero by normal front edge correction, and then the cooling pulses are reduced to make the average of the other distributions zero. Figure 15A ~ Figure 15C is a schematic diagram illustrating the processing procedure of this embodiment. Figure 15A Indicates the initial state of each distribution of edge shifts sorted by the length of the preceding mark. Then, the leading edge correction is carried out for each mark, such as Figure 15B As shown, the mean of the distribution that minimizes the edge displacement becomes zero. In the case of the illustrated example, the average of the distribution a of edge displacements of recording marks having a preceding mark length...

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Abstract

The present invention provides an optical disc recording method and an optical disc recording device, which correct the edge displacement separated depending on the length of the preceding mark. Let n be an integer and T be the channel bit length, and the time width of the cooling pulse in the recording pulse train for forming a mark with a length of nT is determined according to the edge shift amount of the front edge of a mark with a length of nT in the preceding mark.

Description

technical field [0001] The present invention relates to an optical disc recording method for recording information by irradiating pulsed laser light whose intensity is adjusted, and an optical disc recording device using the method. Background technique [0002] In a recording type optical disc, information is recorded by irradiating the optical disc with pulsed laser light whose intensity is adjusted to change the state of the recording film to form marks and mark spaces (spaces). Among recordable optical disks, DVD-R and DVD+R are known as write-once optical disks that can record information only once, and DVD-RAM, DVD-RW, and DVD+RW are known as rewritable optical disks that can rewrite information. In addition, Blu-ray Disc (BD) has recently been put into practical use as a large-capacity optical disc using a blue light source, and there are a write-once type BD-R and a rewritable type BD-RE. [0003] In the mark edge recording method used in current optical discs, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/0045
CPCG11B7/00456G11B7/0062
Inventor 黑川贵弘
Owner HITACHI CONSUMER ELECTRONICS CORP