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Optical recording medium

A technology of optical recording medium and optical system, which is applied in the direction of optical recording head, optical recording carrier, optical recording carrier manufacturing, etc., and can solve problems such as impact

Inactive Publication Date: 2005-04-13
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, the tilt angle is easily affected by aberrations caused by the base thickness of the optical recording medium

Method used

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Embodiment Construction

[0043] An optical disc according to an embodiment of the present invention will hereinafter be described in detail with reference to the corresponding drawings.

[0044] In this embodiment, the present invention is applied to an optical disc on which a signal is read by irradiation with laser light through a light-transmitting layer on a base layer, for example, a substrate having an information recording layer .

[0045] In a general optical recording disc, the value of the disc tilt margin θ, N.A. and the thickness of the light transmission layer are correlated with each other. Japanese Patent Publication No. H3-225650 discloses a correlation between these parameters and the range θ for CDs which have been widely proven to have practical playability.

[0046] From the above publication, it is sufficient to establish the following equation (2).

[0047] θ≤±84.115(λ / N.A. 3 / t) …(2)

[0048] This standard can be applied to the optical recording medium according to the prese...

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Abstract

An optical recording medium includes a base layer and a light-transmitting layer formed on the base layer, wherein the base layer has an information signal portion formed on a side surface on which laser light is input. The thickness t of the light transmission layer is in the range of t=3 to 177 μm at least in a region of the information signal portion. If the inhomogeneity of the light transmission layer is Δt, then the N.A. and wavelength λ of the optical system for reproduction or recording and reproduction satisfy Δt≤±5.26(λ / N.A. 4 ) (μm). Track pitch P and tilt θ satisfy P≤0.64μm and θ≤±84.115°(λ / N.A. 3 / t). This optical recording medium allows a recording capacity of 8 GB.

Description

technical field [0001] The present invention relates to an optical recording medium which has at least one light-transmitting layer having an information recording layer and is formed on one main surface of a substrate and is used for reproduction by irradiation with reproduction light from a light-transmitting layer side information. [0002] In particular, the present invention relates to an optical recording medium having a large capacity by determining the relationship between the thickness of the light transmission layer, the unevenness of the thickness, the skew, etc., and also to a An optical disc device for recording or recording and reproducing an optical recording medium. Background technique [0003] An optical recording medium capable of recording and reproducing four hours' worth of NTSC signal data on one side has been introduced as an optical recording medium of the next stage. [0004] The use of this introduced optical medium allows a home video recorder (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/24065G11B7/007G11B7/013G11B7/12G11B7/1372G11B7/1374G11B7/24079G11B7/26
CPCG11B7/007G11B7/00718G11B7/1374G11B7/24G11B7/24038G11B7/24085G11B7/26G11B7/263G11B2007/13727G11B7/24067G11B7/2533G11B7/2585G11B7/24053G11B2220/232G11B2220/235G11B2007/0133G11B2220/2525G11B2220/2537
Inventor 柏木俊行川久保伸中沖有克金子正彦
Owner SONY CORP
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