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Optical recording medium, recording and reproducing method thereof, and optical recording and reproducing apparatus

An optical recording medium and recording layer technology, which can be applied to recording/reproducing by optical methods, optical recording carriers, temperature recording methods, etc., can solve problems such as insufficient performance, and achieve reduced crosstalk, good recording signal performance, and stable recording. and reproduced effects

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

AI Technical Summary

Problems solved by technology

However, in these prior arts, in the case of a single-sided double-layer optical recording medium, the performance in the formation of recording marks in the second recording layer is still insufficient.

Method used

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  • Optical recording medium, recording and reproducing method thereof, and optical recording and reproducing apparatus
  • Optical recording medium, recording and reproducing method thereof, and optical recording and reproducing apparatus
  • Optical recording medium, recording and reproducing method thereof, and optical recording and reproducing apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166] -Preparation of Optical Recording Medium-

[0167] A concavo-convex shape made of polycarbonate resin having a diameter of 120 mm and a thickness of 0.57 mm on which a guide groove of a depth of 32 nm (320 Å) and a width of 0.25 μm (at the bottom of the groove) was formed A patterned second substrate, wherein the pattern has a track pitch of 0.74 μm. On the second substrate, a second reflective layer containing AgIn (the mixing ratio of Ag to In is 99.5 to 0.5 in atoms) was formed to have a thickness of 150 nm (1500 Å) by a sputtering method using Ar as a sputtering gas.

[0168] Next, on the second reflective layer, a layer having a thickness of 80 nm (800 A), the squarylium dye compound A is represented by formula (3), and has the substituents shown in Table 1.

[0169] Next, on the second recording layer, a protective layer containing ZnS-SiC (the molar ratio of ZnS:SiC is 8:2) was formed to have a thickness of 150 nm (1500 nm) by a sputtering method using Ar as a ...

Embodiment 2 to 6 and comparative example 1 to 3

[0185] -Preparation of Optical Recording Medium-

[0186] In addition to changing the squarylium metal chelate A as the material of the second recording layer to the squarylium metal chelate B to I represented by the formula (3) and containing the substituent shown in Table 1, with the implementation An optical recording medium was prepared in the same manner as in Example. For each of the squarylium metal chelates B to I, the pyrolysis temperature and the pyrolysis temperature range were measured in the same manner as in Example 1. The results are shown in Table 1.

[0187]

[0188] Each optical recording medium was evaluated in the same manner as in Example 1. It was found that reflectance (I14H) was 19%, modulation (I14 / I14H) was 90%, and PI Sum 8 after recording was 20 or less. Therefore, signal performance satisfying the DVD-ROM standard is obtained.

[0189] Also, the amount of crosstalk was evaluated in the same manner as in Example 1. The results are shown in Ta...

Embodiment 7

[0191] -Preparation of Optical Recording Medium-

[0192] Except that the thickness of the second recording layer is changed to 50nm (500 Ȧ) and the thickness of the protective layer containing ZnS-SiC, wherein the molar ratio of ZnS to SiC is 8 to 2 is changed to 180nm (1800 Ȧ). 1 Prepare an optical recording medium in the same manner.

[0193]

[0194] Each optical recording medium was evaluated in the same manner as in Example 1. It was found that: reflectivity (I14H) of 18%, modulation (I14 / I14H) of 65%, and PI Sum 8 of 20 or less after recording; signal performance satisfying the DVD-ROM standard was obtained.

[0195] Also, the amount of crosstalk was evaluated in the same manner as in Example 1. The results are shown in Table 2 and Figure 8.

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Abstract

The present invention is aimed to provide a high-performance single-sided double-layer optical recording medium with reduced crosstalk between recording marks, wherein favorable recording signal properties are obtained even from the second recording layer located more distant from the substrate to which the light is applied, and reproducing method thereof, and an optical recording and reproducing apparatus. The optical recording medium possesses the following aspects: the optical recording medium comprises a first substrate, a first information layer, an intermediate layer, a second information layer and a second substrate in this order; the first information layer comprises a first recording layer; the second information layer comprises a second reflective layer, a second recording layer with an organic dye and a protective layer; and the pyrolysis temperature range, the DTA peak width of the thermal analysis on the organic dye in the second recording layer, is 45 DEG C or less.

Description

technical field [0001] The present invention relates to an optical recording medium (hereinafter sometimes referred to as "optical information recording medium" or "information recording medium") preferably applied specifically to a write-once-read-many DVD disc, a method of recording and reproducing thereof , and an optical recording and reproducing apparatus using the optical recording medium. Background technique [0002] In addition to optical recording media such as digital read-only versatile discs (DVDs), recordable DVDs (for example, DVD+RW, DVD+R, DVD-R, DVD-RW, and DVD-RAM) have been put into practical use. [0003] DVD+R and DVD+RW have benefited from the expansion of conventional technology for recordable compact discs (CD-R and CD-RW), and in order to maintain playback compatibility of DVD+R and DVD+RW with read-only DVDs, the DVD +R and DVD+RW are designed so that the recording density (eg, track pitch and signal mark length) and substrate thickness are compat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/254G11B7/244G11B7/257B41M5/26G11B7/24038G11B7/246G11B7/2463G11B7/2467G11B7/247G11B7/2472G11B7/249G11B7/253G11B7/2534G11B7/2578G11B7/258G11B7/2585G11B7/259G11B7/2595
CPCG11B7/2463G11B2007/25706G11B2007/25718G11B7/246G11B7/249G11B7/2534G11B2007/25716G11B2007/2571G11B7/2472G11B2007/25708G11B7/245G11B2007/25715G11B7/2578G11B7/259G11B7/2595G11B2007/25711G11B7/24038G11B7/2585G11B7/2467G11B7/248Y10T428/21
Inventor 八代彻
Owner RICOH KK
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