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Optical disk and optical disk apparatus

A technology for optical discs and equipment, which is applied in the directions of optical record carriers, optical record carrier manufacturing, recording/reproducing by optical methods, etc., and can solve the problems of shortened service life of the recording layer and decreased reliability.

Inactive Publication Date: 2007-09-19
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the case where the organic dye material does not flow to the depth of the groove, defects including shortened service life and reduced reliability of the recording layer occur

Method used

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  • Optical disk and optical disk apparatus
  • Optical disk and optical disk apparatus
  • Optical disk and optical disk apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0052] structure and material

[0053]FIG. 1 is a cross-sectional view showing an example of dimensions of grooves in a dual-layer recordable optical disc according to an embodiment of the present invention. Fig. 2 is a cross-sectional view showing an example of its layer structure. Fig. 3 is a cross-sectional view showing an example of its layer structure. FIG. 1 shows only substrates, and FIG. 2 shows a state where an information recording layer is formed on the substrates and the substrates are adhered to each other.

[0054] As shown in Figure 1, in the optical disc D according to the present invention, the transparent substrate 11, the first information layer 12, the adhesive layer (intermediate layer) 13, the second information layer 14, and the substrate 15 are viewed from the incident laser beam plane. Arrange in the above order. A polycarbonate (PC) substrate or a glass substrate can be used as the substrate 11 or 15 . In the substrate or the adhesive layer, a gro...

no. 2 example

[0086] The second embodiment illustrates that the grooves of the first information layer 22 are provided in the transparent substrate 71 and the grooves of the second information layer 74 are provided in the substrate 75 . Here, no grooves are provided in the adhesive layer 73 .

[0087] More specifically, as shown in FIG. 13, the grooves provided in the first information layer 12 and the second information layer 14 in FIG. 1 are formed in the transparent substrate 71 and the substrate 75, respectively. In this example, the above-mentioned first to third test data and the recording and reproduction characteristics of Comparative Examples 1 and 2 were obtained.

[0088] Also, with respect to the grooves formed in the first and second information layers, recording can be performed only on grooves close to the laser beam incident face. Also, with regard to the grooves formed in the first and second information layers, recording can be performed only on grooves far from the laser...

no. 3 example

[0090] The third embodiment illustrates that the grooves of the first information layer 82 are provided in the adhesive layer 83 and the grooves of the second information layer 84 are provided in the adhesive layer 83 . Here, no grooves are provided in the transparent substrate 81 and the substrate 85 .

[0091] More specifically, as shown in FIG. 14 , the grooves arranged in the first information layer 12 and the second information layer 14 in FIG. 1 are formed in the adhesive layer 83 . In some cases, adhesive layer 83 may be multiple layers made of multiple materials. Also in this embodiment, the above-mentioned first to third test data and the recording and reproduction characteristics of Comparative Examples 1 and 2 were obtained.

[0092] Also, with respect to the grooves formed in the first and second information layers, recording can be performed only on grooves close to the laser beam incident face. Also, with regard to the grooves formed in the first and second inf...

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Abstract

An optical disk has transparent substrate layer (11) provided at light incidence side, first information layer (12) which has first groove of first depth (H1), adhesive layer (13) provided on the first information layer, and second information layer (14) which has second groove of second depth (H2) that is deeper than the first depth, and irreversibly records information therein, wherein the first depth and the second depth are lambda / 2n or less, the width of the first and second grooves is 0.3 [mu]m or less, the track pitch of the first and second grooves is 0.45 [mu]m or less, the first and second information layers include organic dye material having light absorption in the range of the wavelength of laser beam for use in recording and reproducing information from 390 nm to 420 nm.

Description

technical field [0001] An embodiment of the present invention relates to a multilayer type optical disc capable of recording and reproducing information from a light incident plane to a multilayer recording film and an optical disc device performing the recording and reproducing operations. Background technique [0002] As for an optical disc as an information recording medium, an optical disc of the DVD standard capable of recording video and music contents is widely used. Examples of such optical discs include a play-only type, a write-once type in which information can be recorded once, and a rewritable type presented by external memories of computers and video recorders. An optical disc of the DVD standard has a structure in which two substrates having a thickness of 0.6 mm (nominal) are bonded to each other. The NA of the objective lens is 0.6, and the wavelength of the laser beam used in recording / reproduction is 650 nm. [0003] In recent years, higher and higher st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/26G11B7/24027G11B7/24035G11B7/24038G11B7/24047G11B7/24079G11B7/24085G11B7/246
CPCG11B7/24079G11B7/24038
Inventor 大间知范威松丸祐晃山本亮介
Owner KK TOSHIBA
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