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Optical recording medium

An optical recording medium, optical recording technology, applied in the direction of optical recording carrier, optical recording carrier manufacturing, magnetic recording, etc., can solve problems such as multi-time, not a realistic method, etc.

Inactive Publication Date: 2004-08-04
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore requires a very large amount of time, making this method not a realistic method

Method used

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  • Optical recording medium
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Embodiment Construction

[0046] Now, an embodiment of the present invention will be described with reference to the accompanying drawings. The format of the optical disc used in this embodiment employs the method of partitioning to arrange addresses. That is, as shown in FIG. 1, the data recording and reproducing area is divided into a plurality of zones in the radial direction. In one area, rows of embossed pits (address area) having address information, as the header of the sector, are arranged in the radial direction. At least one group or more of address areas are alternately arranged between adjacent areas.

[0047] In this embodiment, the arrangement of the pits and grooves in the address part (address area) is controlled so that the average reflection coefficient of the address part of the three types of optical discs produced has an average reflection coefficient of the data part (data area). The reflection coefficients (Iadd) were -40%, +13% and +30%, respectively.

[0048] As a method of ...

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Abstract

This invention is to provide an an optical recording medium which has a spiral track or concentric tracks and on which data is optically recorded. A data recording / reproducing area of the optical recording medium is radially divided into zones. Each zone is divided into sectors each having an address portion including a pit having address information and a data portion composed of only grooves. The numbers of sectors of the zones are different from one another. The relation between the average reflectance Iadd of the address portion and the average reflectance Idata of the data portion is given by 0.7 <= (Iadd / Idata) <= 1.3 or given by 0.8 <= (Iadd / Idata) <= 1.2.

Description

technical field [0001] The present invention relates to an optical recording medium for recording and reproducing data using a laser beam, and more particularly to an optical recording medium in which address areas are spaced at radial intervals by a method called With partitioning technology, the storage capacity of optical discs has been improved. Background technique [0002] In order to increase the storage capacity by effectively using the recording area on the optical disc, a method called partitioning has hitherto been used. In this method, a reference recording frequency for recording and reproducing data is switched for each radius on, for example, an optical disc rotating at a constant angular velocity so that the entire optical disc surface has substantially the same recording density. [0003] For example, in ISO / IEC14517 (130mm4x), ISO / IEC15286 (130Mm8x), ISO / IEC15041 (90mm5x) or similar magneto-optical ISO standard magneto-optical discs, the storage capacity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/007G11B7/013G11B7/24012G11B7/2405G11B7/2433G11B7/26G11B11/105
CPCG11B11/10597G11B7/268G11B7/0079G11B7/24085G11B7/00745G11B7/24012G11B11/10578G11B7/00718G11B11/10526G11B11/10584G11B7/007
Inventor 中山比吕史竹内厚有马光雄
Owner SONY CORP
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