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Optical disk, optical disk apparatus, and optical disk reproducing method

A technology of optical discs and equipment, applied in the field of multi-layer optical discs, to achieve the effect of suppressing leakage components and ensuring quality

Inactive Publication Date: 2007-10-17
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in this method, if the number of layers increases, the number of interlayer distances between adjacent intermediate layers also increases, so that highly accurate distance control is required
This has led to pressure on manufacturing margins for multilayer discs

Method used

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  • Optical disk, optical disk apparatus, and optical disk reproducing method
  • Optical disk, optical disk apparatus, and optical disk reproducing method
  • Optical disk, optical disk apparatus, and optical disk reproducing method

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Embodiment Construction

[0025] Various embodiments according to the present invention will be described below with reference to the accompanying drawings. Generally speaking, according to an embodiment of the present invention, a multi-layer optical disc includes three or more recording layers, wherein one of the following conditions is met: (1) R n / ((R n-1 +R n-2 ) / 2)>0.6; and (2)R n ×(100-R n-1 ) 2 / (R n-2 × R n-1 × R n-1 )>30, where R n (%) is the reflectance of the n-th layer (n>2) when viewed from the surface on which reproduction light is incident.

[0026] 1 is an exemplary cross-sectional view showing an exemplary structure of a multilayer optical disc (single-sided three-layer optical disc) according to an embodiment of the present invention. The multi-layer optical disc shown in FIG. 1 is, for example, a single-sided three-layer HD DVD ROM disc. In the multilayer optical disc shown in FIG. 1, the signal recording pattern 2 is formed on the layer 0 (L0) molding plate 10, the signa...

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Abstract

The invention provides an optical disk, an optical disk device and an optical disk reappearance method. According to an embodiment, a multi-layer optical disk comprises three or more record layers (L0, L1 and L2) and meets one of the following conditions: (1) Rn / ((Rn-1 plus Rn-2) / 2) is more than 0.6; (2) Rn multiplied by (100-Rn-1)<2> / (Rn-2 multiplied by Rn-1 multiplied by Rn-1) is more than 30, wherein, Rn (percent) is the reflectivity of a n layer (n is more than 2) seen from the surface (IS) on which reappearance light is entered.

Description

technical field [0001] One embodiment of the present invention relates to a multilayer optical disc capable of recording information, such as CD, DVD, BD (Blu-ray Disc), HD DVD, and the like. In addition, another embodiment of the present invention relates to an optical disc apparatus for reproducing the multi-layer optical disc. Furthermore, still another embodiment of the present invention relates to a method for reproducing an optical disc. Background technique [0002] Currently, optical disks like CDs and DVDs are generally used as media for storing digitized information. Among these optical discs, DVD (or HD DVD, the standardization of which is being considered as a next-generation optical disc) includes a disc structure in which two plastic substrates are bonded to each other. Therefore, it is relatively easy to increase the storage capacity of a DVD by using two information recording layers. However, in order to meet the demand for higher capacity, a multi-layer o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/242G11B7/24035G11B7/24038
CPCG11B7/24038
Inventor 大寺泰章吉田展久中村直正
Owner KK TOSHIBA