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Optical recording medium and method for producing the same

A technology of optical recording medium and manufacturing method, applied in the direction of optical recording carrier manufacturing, optical recording carrier, optical recording/reproduction, etc., capable of solving problems such as thickness unevenness, radial uneven thickness, peripheral reflection signal noise, etc.

Inactive Publication Date: 2007-12-19
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It was also found that, for example, when rotating at a low speed of about 200 rpm, radial thickness unevenness occurs from the inner peripheral side to the outer peripheral side.
Therefore, due to this uneven thickness, the reflection signal on the outer peripheral side generates noise.

Method used

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  • Optical recording medium and method for producing the same
  • Optical recording medium and method for producing the same
  • Optical recording medium and method for producing the same

Examples

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Embodiment 1

[0103] The tamp is set on an injection molding machine (manufactured by Sumitomo Heavy Industries, Ltd.), and polycarbonate is used as a raw material to form a spiral groove (groove depth: 130nm, groove width: 320nm, groove pitch: 0.74 μm) substrate with a thickness of 0.6 mm and a diameter of 120 mm. Simultaneously, a dummy substrate similar to this substrate was formed.

[0104] Using the spin coating method at a temperature of 30°C and 45% RH, a 2,2,3,3-tetrafluoropropanol solution (0.68% by weight) of the following pigment A as a pigment solution is coated on the groove formation of the substrate On the surface, a dye recording layer having a layer thickness of 150 nm was formed. At this time, the rotational speed of the substrate was set to the value shown in Table 1 for each of the examples and comparative examples from the start of the dye solution discharge to the end of the discharge. Then, silver was laminated to a thickness of about 150 nm on the pigment recording...

Embodiment 4

[0114] The tamp was set on an injection molding machine (manufactured by Sumitomo Heavy Industries, Ltd.), and polycarbonate resin was used as a material to form a spiral groove (groove depth: 130nm, groove width: 320nm, groove pitch : 0.74 μm) substrate with a thickness of 0.6 mm and a diameter of 120 mm. Simultaneously, a dummy substrate similar to this substrate was formed.

[0115] Using the spin coating method at a temperature of 30°C and 45% RH, the 2,2,3,3-tetrafluoropropanol solution (0.78% by weight) of the above-mentioned pigment A as the pigment solution is coated on the groove formation of the substrate. On the surface, a dye recording layer having a layer thickness of 150 nm was formed. At this time, for Example 4 and Comparative Examples 5 and 6, the application sequence from the start of the dye solution discharge to the end of the discharge is as shown in FIGS. 1A , 2A and 3A, respectively. 1A to 3A represent the rotation speed (rpm) of the substrate on the v...

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Abstract

A method for producing an optical recording medium including a step of coating a dye solution on a substrate by a spin coating method to form a dye recording layer, wherein the substrate is rotated at a rotation speed of 400 rpm or higher during a period from the beginning to the end of the supply of the dye solution.

Description

technical field [0001] The present invention relates to an optical recording medium and a manufacturing method thereof, in particular to an optical recording medium in which a pigment is used in a recording layer and a manufacturing method thereof. Background technique [0002] It has been known in the past that an optical recording medium (optical disc) in which information is recorded only once by laser light is used. This type of optical disk is also called supplementary recording type CD (so-called CD-R) and DVD-R. Its representative structure is to sequentially stack a recording layer formed of organic pigments and light rays formed of metals such as gold on a transparent disc-shaped substrate. Reflective layer and resin protective layer. Moreover, the information recording in this CD-R is carried out by irradiating the CD-R with laser light in the near-infrared region (usually laser light with a wavelength near 780 nm). The irradiated portion of the recording layer a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/26B05D1/40G11B7/246G11B7/2463G11B7/247G11B7/2472G11B7/2475G11B7/2478G11B7/249G11B7/253G11B7/2531G11B7/2532G11B7/2533G11B7/2534G11B7/2535G11B7/254G11B7/2545G11B7/2548G11B7/258G11B7/259
CPCG11B7/2548G11B7/2463G11B7/266G11B7/249G11B7/2535G11B7/246G11B7/2478G11B7/2534G11B7/256G11B7/2545G11B7/2475G11B7/2533G11B7/2472G11B2007/25417G11B7/245G11B7/2531G11B7/259G11B7/2532G11B7/248G11B7/26
Inventor 柴田路弘
Owner FUJIFILM CORP