Unlock instant, AI-driven research and patent intelligence for your innovation.

Optical recording device and method for recording optical disc

An optical disc recording and optical disc technology, applied in the direction of optical recording/reproducing/erasing methods, optical recording carriers, optical recording systems, etc., can solve the problems of uneven recording film thickness, obstruction of correct recording and reproduction of information, and quality deterioration of reproduced signals Bad question

Inactive Publication Date: 2005-05-25
PANASONIC CORP
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] (2) Deterioration phenomenon in each mark, which occurs in the mark area when mark lines of the same pattern are repeatedly recorded at the same position in the sector
As a result, in the boundary region between the portion where melting and solidification occurs repeatedly and the portion where melting does not occur at all, the film thickness of the recording film becomes non-uniform, deteriorating thermal and optical characteristics, and deteriorating reproduction in these portions. Deterioration of signal quality, thus preventing correct recording and reproduction of information

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical recording device and method for recording optical disc
  • Optical recording device and method for recording optical disc
  • Optical recording device and method for recording optical disc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] figure 1 The format structure of the optical disc according to the first embodiment of the present invention is shown. Omit the above-mentioned prior art Figure 18 The description of the part of the format structure is also shown.

[0059] Compared with the prior art, the added and modified part is the protection data recording area 100 for recording protection data, which is provided between the header area 4 and the data recording area 5. Since no signal is recorded in the space area 7, the recording of the signal is started in the protected data recording area 100 in the sector.

[0060] Refer to Figure 2a-c, which illustrates that when repeating records, when there is figure 1 The relationship between the deterioration of the recording medium and the synchronization signal VFO in the optical disc with the format structure shown at the recording start point.

[0061] Figs. 2a-c show the deterioration of the recording medium near the recording start point of the data ...

Embodiment 2

[0067] See now image 3 Explaining the optical disc device according to the second embodiment of the present invention, the present invention aims to perform recording and reproduction in an optical disc having a protected data recording area at the beginning of a sector. The parts already explained in the optical disc device of FIG. 19 related to the above-mentioned prior art are omitted.

[0068] The parts added to the prior art are the protection data generating circuit 200 and the first recording control circuit 201. The protection data generating circuit 200 generates specific protection data. The protection data of the protection data generation circuit 200 is provided first, then the synchronization signal VFO of the synchronization signal VFO generation circuit 14 is added, and finally the modulation data of the data modulation circuit 13 is added. This data timing is controlled by the first recording control circuit 201. The combined protection data, synchronization signa...

Embodiment 3

[0071]Figures 4a-d and Figures 5a-d show the difference between the deterioration of the recording medium at the start of recording and the synchronization interval of the synchronization signal area VFO in the optical disc having the format structure according to the third embodiment of the present invention. relationship. In the optical disc of the third embodiment, the recording mode of the protection data in the protection data recording area is the same as the recording mode of the synchronization signal area VFO. Moreover, at the boundary between the protected data recording area and the synchronization signal area, the phase of the recording mode is matched so as not to cause deterioration.

[0072] First, in FIGS. 4a-d, the protection data in the protection data recording area and the recording mode of the synchronization signal area VFO are different. Fig. 4a shows the data recording area after one repetition, Fig. 4b shows the synchronization lock range, Fig. 4c shows th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an optical disc recording device and a method for recording an optical disc. The method includes forming a sector structure comprising in sequence: a first space area without a signal space, a first protection data recording area for recording protection data, a synchronization signal and subsequent user data A data recording area, a second protection data recording area for recording protection data, and a second space area without a signal interval; the total length of the first and second space areas is set to be constant; the first and second protection data The total length of the recording area is set constant; the lengths of the first and second space areas are randomly changed every recording, and the lengths of the first and second protection data recording areas are randomly changed every recording; and A change amount of the first and second spacer areas is controlled to be smaller than a change amount of the first and second protection data recording areas.

Description

Technical field [0001] The present invention relates to an optical disc, an optical disc recording device and an optical disc recording method for recording and reproducing digital signals in sector units of the optical disc. Background technique [0002] From EP-A-0718831, a method and device for recording and reproducing a rewritable phase-change optical disc is known. According to the content disclosed in this document, the repeated rewriting capability of an optical disc can be expanded by randomly recording non-reverse write data or reverse write data. Deterioration due to repeated rewriting at the start and end of recording is suppressed by recording synchronization signals before writing data and / or recording dummy data after writing data in such a way that thermal stress does not easily occur. Stop recording by detecting pause can accurately determine the end of recording. [0003] EP-A-0814463 discloses a device for writing or reading a rewritable optical disc, which inc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/12G11B7/0045G11B7/006G11B7/007G11B11/105G11B27/19G11B27/24G11B27/30
CPCG11B7/00454G11B7/006G11B7/00745G11B11/10521G11B20/12G11B20/1217G11B20/1251G11B27/19G11B27/24G11B27/3027G11B2020/1232G11B2020/1277G11B2020/1287G11B2220/216G11B2220/2525G11B2220/2529G11B2220/2545G11B2220/2562
Inventor 石田隆久保田真司东海林卫石田慎二
Owner PANASONIC CORP