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Optical disc

A kind of technology of optical disc and cover layer

Inactive Publication Date: 2008-03-12
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the case of such a structure, since the thickness of the substrate and the thickness of the cover layer are very different, if it is used under conditions where the ambient temperature changes greatly, warping will easily occur
Even if the material of the cover layer is changed in various ways, it is difficult to ease the deformation

Method used

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  • Optical disc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Injection-molded polycarbonate resin (polycarbonate manufactured by Teijin Chemicals Co., Ltd., manufactured by Teijin Chemicals Co., Ltd.) Ag was sputtered on the grooved surface of a substrate made of Panlight AD5503) to form a reflective layer with a thickness of 70 nm.

[0102] 12 g of dye A (Orazo-lu-buru-GN: produced by Ciba Special Chemicals Co., Ltd. with maximum absorption: 340 nm, 640 nm) which is a phthalocyanine dye-based organic compound was mixed into 1 liter of 2,2 , in 3,3-tetrafluoropropanol, ultrasonic treatment was carried out for 2 hours to dissolve it, and the coating liquid for recording layer formation was prepared. Using this coating liquid, an information recording layer having a thickness of 70 nm was formed on the reflective layer by a spin coating method.

[0103] In addition, Ag was sputtered on the substrate on the side where the information recording layer was not formed to form a reflective layer with a thickness of 70 nm.

[0104] On t...

Embodiment 2

[0107] As the first cover layer and the second cover layer, except that the polycarbonate film was replaced by a cellulose triacetate film (Fuji Tuck (7 ジタック) manufactured by Fujifilm Co., Ltd., thickness 80 μm), in addition to that, the same method as in the implementation An optical disc was produced in the same manner as in Example 1.

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Abstract

An optical disc is characterized in that an image recording layer and a first cover layer are successively formed on one side of a substrate, and an information recording layer and a second cover layer are successively formed on the other side of the substrate. The thickness of the first cover layer and that of the second cover layer are preferably substantially the same. The material of the first cover layer and that of the second cover layer are preferably the same. The material of the first cover layer and the second cover layer is preferably cellulose triacetate.

Description

technical field [0001] The present invention relates to an optical disc capable of recording visible images on a label surface (surface opposite to an information recording surface). Background technique [0002] With the rapid spread of networks such as the Internet and high-definition TV, or the start of broadcasting of HDTV (High Definition Television), large-capacity optical discs that can be used to record image information at low cost and easily are becoming necessary. DVD-R (digital versatile disk recordable: Digital Versatile Disk) is currently fully functioning as a large-capacity optical disc, but the demand for large capacity and high density is getting higher and higher, and it is necessary to develop products that can meet these requirements. optical recording media. Therefore, the development of an optical disc capable of high-density recording with light having a shorter wavelength than that used in DVD-R and having a larger capacity is being promoted. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/2403G11B7/24035G11B7/24053G11B7/24056G11B7/24094G11B7/24097G11B7/2542
CPCG11B7/2403G11B7/24053G11B7/24G11B7/2478G11B7/24094G11B7/2542G11B7/2534G11B7/252G11B7/258
Inventor 久保裕史
Owner FUJIFILM CORP