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Optical recording medium, and method for producing optical recording medium

A technology for optical recording media and information recording, which is used in the manufacture of optical record carriers, optical record carriers, recording/reproducing by optical methods, etc.

Active Publication Date: 2011-04-20
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Such a high-density optical disc has a light-transmitting layer made of a resin curable by an excitation energy beam only on one side thereof (the information output side where the laser beam is incident), and is therefore asymmetrical in the disc thickness direction

Method used

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  • Optical recording medium, and method for producing optical recording medium
  • Optical recording medium, and method for producing optical recording medium
  • Optical recording medium, and method for producing optical recording medium

Examples

Experimental program
Comparison scheme
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no. 3 example

[0023] 3. Third Embodiment (Third Example of Optical Recording Medium)

no. 4 example

[0024] 4. Fourth Embodiment (Fourth Example of Optical Recording Medium)

[0025] 5. Other embodiments (variations)

no. 1 example

[0027] [1-1. Structure of Optical Recording Medium]

[0028] A recordable optical recording medium according to a first embodiment of the present invention will be described below. figure 1 is a sectional view schematically showing a configuration example of a recordable optical recording medium according to the first embodiment of the present invention. The recordable optical recording medium 10 is configured to include a reflective layer 2 , a first protective layer 3 , an information recording layer 4 , a second protective layer 5 , and a light transmissive layer 6 laminated on a substrate 1 in this order.

[0029] In the recordable optical recording medium 10, the information recording layer 4 is irradiated with a laser beam from the side of the light transmission layer 6 to record or reproduce an information signal. For example, a laser beam having a wavelength in the range of 400 nm or more and 410 nm or less is concentrated by an objective lens having a numerical apert...

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Abstract

An optical recording medium includes: a substrate; an information recording layer formed on the substrate for recording and reproducing an information signal by irradiation with light; and a light transmission layer formed on the information recording layer and transmitting the light, the storage elastic modulus of the light transmission layer at -5 DEG C. being within a range of 1500 MPa or less.

Description

technical field [0001] The present invention relates to optical recording media. In particular, the present invention relates to an optical recording medium having a light-transmitting layer made of a UV-curable resin, and also to a method for manufacturing the optical recording medium. Background technique [0002] Density-increased optical recording media have been developed, and for example high-density optical discs having significantly larger capacities than conventional CDs (Compact Discs) and DVDs (Digital Versatile Discs) are known. [0003] In a high-density optical disc, an information signal portion for recording and / or reproducing an information signal is formed on one main surface of a disc substrate, and a reflective film is formed on the information signal portion. In addition, a light-transmitting layer and a protective layer are formed thereon by, for example, spin coating. At the time of recording / reproduction, a laser beam is applied to the information s...

Claims

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Application Information

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IPC IPC(8): G11B7/242G11B7/26G11B7/24G11B7/24056G11B7/2534G11B7/254G11B7/2542G11B7/257
CPCG11B2007/25715G11B2007/2571G11B7/24056G11B7/2542G11B2007/25713G11B2007/25706G11B7/259G11B7/266Y10T428/21
Inventor 菊地稔川崎弘幸大木隆中田芳昭
Owner SONY CORP
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