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Optical disk with oscillating convex region and groove

An optical disc and optical disc recording technology, applied in the direction of groove/land recording, optical record carrier, disc record carrier, etc., can solve the problems of increased redundancy, time-consuming, and inability to record continuous data, etc.

Inactive Publication Date: 2004-11-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thereby increasing the redundancy by corresponding parts at the expense of user data capacity
[0008] In addition, once the address of the sector is determined in the traditional recording method, when data such as video data and audio data are continuously recorded according to time, if the sector address cannot be confirmed, it will take time to confirm the address again to record, and it cannot be recorded. continuous data
In another method of recording data, where the sector address does not need to be reconfirmed but it is deduced from the original address, when the sector is calculated by a fixed clock, the sector length error accumulates and the deviation of the calculation increases.
[0009] In particular, in the intermediate address method in a land-groove recording system having a possibility of deteriorating address detection accuracy, the above-mentioned problems occurring when video data and audio data are continuously recorded may be more serious

Method used

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  • Optical disk with oscillating convex region and groove
  • Optical disk with oscillating convex region and groove
  • Optical disk with oscillating convex region and groove

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Fig. 4 is a schematic diagram of an optical disc according to a first embodiment of the present invention.

[0041] As shown in Figure 4, the guide track of the optical disc is arranged so that the optical head can perform the same tracking when recording and reproducing information, and the optical disc is designed so that the groove (solid line) and the land (dotted line) are interchanged every revolution. once. There are a large number of sectors in one rotation, and the sector is composed of an ID field, an information recording field and an information non-recording field. The guide tracks shown are helical, but they could also be concentric or reverse helical. The number of sectors per revolution is also arbitrary.

[0042] figure 1 A portion where grooves and lands are interchanged on the optical disk of the first embodiment of the present invention is shown. The ID field consists of 4 parts, ID1, ID2, ID3, ID4, each of which includes address information, an...

Embodiment 2

[0068] FIG. 6(a) shows an address field of an optical disc in an L / G (land and groove information recording and reproduction) system on the optical disc of the second embodiment of the present invention. On the optical disc in FIG. 6( a ), the address information of the ID field consists of two set bits, which are offset by 1 / 2 of the track pitch relative to the inner circumference side or the outer circumference side. The width of the convex and concave signals is substantially equal to the width of the grooves and lands of the information recording field. The grooves and lands change at each turn of the track. The ID field is composed of two parts, IDa and IDb, each containing address information, and deviated from the guide track to the inner circumferential side or the outer circumferential side by a distance of about 1 / 2 of the track pitch. That is, one address is shared by adjacent grooves and lands. The guide track (information recording field) wobbles in a direction ...

Embodiment 3

[0079] FIG. 8(a) shows an address field of an optical disc in an L / G (land and groove recording and reproduction) system on an optical disc in a third embodiment of the present invention. In the optical disc of FIG. 8( a ), the address information of the ID field is independently provided in the land and the groove, and is located in the middle of the land and the groove. To suppress interference from adjacent tracks, the pit width of the land and groove signals of the ID field is smaller than the width of the grooves or lands.

[0080] FIG. 8(b) explains the phase deviation of the wobble at the transition point of the groove and the land on each track of the optical disk of the third embodiment of the present invention. The wobble has an integer multiple of periods per sector, and the track has an integer multiple of sectors per revolution. Therefore, the wobble phase is continuous during one revolution of the disc, but due to manufacturing effects such as rotational fluctua...

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Abstract

In an optical disc, an ID field contains a plurality of address information, and is preliminarily recorded in convex and concave signals, and is composed of two sets offset by about 1 / 2 track pitch toward the internal or external track direction adjacent to the guide track, an information recording field is composed of grooves and lands oscillating at a single frequency in the radial direction, and the grooves and lands alternate in every revolution of the guide track. When w bits of information are included in one period of oscillation, an information unrecorded field between the ID field and information recording field is arranged to have a length of w / 10 bits or more and / or w bits or less.

Description

[0001] This application is a divisional application with the application number 97199116.2 and the title of the invention is "Disc with Wobbled Lands and Grooves". technical field [0002] The invention relates to an optical disc format, in particular to a rewritable optical disc. Background technique [0003] Optical discs are currently widely used as a medium to record software and images, sound and computer data. Especially recently, the demand for increasing the recording density of optical discs has become more and more urgent, so it is very necessary to develop an optical disc format suitable for meeting such demands. [0004] The format of the already existing "130mm rewritable optical disc" is described below. [0005] The format of the 130mm rewritable optical disc is specified as JIS X 6271. This format includes the type A format in which continuous grooves are formed in a spiral shape on the disk and the lands between the grooves are used as tracks for recording...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/007G11B7/09G11B27/19G11B27/30
CPCG11B7/00718G11B7/0938G11B2220/211G11B7/007G11B7/24082G11B7/00745G11B2220/20G11B27/3027G11B27/19
Inventor 石田隆田中伸一武藤朗竹村佳也大原俊次佐藤勋
Owner PANASONIC CORP
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