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Optical recording medium

A technology for optical recording and media, which is applied to optical record carriers, optical recording/reproducing, data recording, etc., and can solve problems such as expensive punching machines

Inactive Publication Date: 2005-02-16
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This way, it is cheaper to prepare a large number of media with the same information, but the punching machine is relatively expensive, so this method is not suitable for preparing a small amount of media

Method used

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  • Optical recording medium
  • Optical recording medium
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 0.5 g of xylylene blue dye (manufactured by Tokyo Kasei Kogyo Co., Ltd.) was dissolved in 10 ml of n-octane to prepare a coating solution. The injection-molded substrate is formed of polycarbonate (outer diameter of 120 mm, thickness of 1.2 mm), which includes an annular groove with a track pitch of 1.6 μm, a groove width of 0.6 μm, and a groove depth of 0.17 μm. The substrate was spin-coated with the solution prepared above at a rotation speed of 1500 rpm to form a recording layer. The range for forming the dye film is set to extend to the outermost circumference of the outer circumferential surface of the concave portion to avoid the concave portion (stacked ring), that is, the ring marks produced by the compression molding.

[0071] Next, a silver-plated film with a thickness of 60 nm was formed on the recording layer by a sputtering method, thereby obtaining a reflective layer.

[0072] Furthermore, on the substrate on which the reflective layer is formed, screen printi...

Embodiment 2

[0076] 0.5 g of xylylene blue dye (manufactured by Tokyo Kasei Kogyo Co., Ltd.) was dissolved in 10 ml of n-octane to prepare a coating solution. The injection-molded substrate is formed of polycarbonate (outer diameter of 120 mm, thickness of 1.2 mm), which includes an annular groove with a track pitch of 1.6 μm, a groove width of 0.6 μm, and a groove depth of 0.17 μm. The substrate was spin-coated with the solution prepared above at a rotation speed of 1500 rpm to form a recording layer. The range of dye film formation is set to extend to the outermost circumference (radius 58mm) of the area (radius 20mm) defined by the Orange Book on the outer circumferential surface of the concave part to avoid the concave part (stacked ring), that is, the molded product Ring traces.

[0077] Next, a silver-plated film with a thickness of 60 nm was formed on the recording layer by a sputtering method, thereby obtaining a reflective layer.

[0078] Furthermore, on the substrate on which the ref...

Embodiment 3

[0083] After forming the recording layer and the reflective layer in the same manner as in Example 2, the outside of the stack ring was spin-coated with ultraviolet curable resin SD-1700 (manufactured by Dainippon Ink & Chemicals, Inc.), and then the same as in Example 1. In this way, the UV curing device with two 80W lamps is used to irradiate and cure to form a 3μm thick bottom protective layer.

[0084] Furthermore, on this layer, a printing plate with a thickness of 350 meshes is used to screen-print the ultraviolet curable resin ink for screen printing. The printing position is on the outer circumference and the hub (inner diameter) of the stack ring forming the underlayer protection layer. It is 17mm to 34mm), the UV curable resin ink used is composed of acrylic UV curable resin with ink viscosity adjusted to 200P without any hydrophilic polymer (OP-MAT GOLD (by Dainichiseika Colour & Chemicals Mfg. Co., Dainichiseika Colour & Chemicals Mfg. Co., Ltd.)). At this time, the su...

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Abstract

There is disclosed an optical recording medium including a recording layer, one or more intermediate layers, and a printable or typable surface protective layer disposed in this order on a transparent substrate having an annular plate shape, the optical recording medium having an inner peripheral portion in which the recording layer is not formed on an inner peripheral side in a radial direction of the transparent substrate, wherein the surface protective layer is formed in at least a part of the inner peripheral portion, and a hydrophobic intermediate layer is directly formed on the transparent substrate in a region of the inner peripheral portion in which the surface protective layer is formed. Label information can be formed on the optical recording medium even in an innermost peripheral hub portion by printing or the like.

Description

Technical field [0001] The present invention relates to an optical recording medium, in particular to an optical recording medium whose surface can be written with writing materials, inkjet printers or thermal printers. Background technique [0002] For currently widely used read-only optical recording media, such as compact discs (CD) and laser discs (LD), a substrate with information is prepared by an injection molding method by a device generally called a punching machine. In this method, the cost of preparing a large amount of media with the same information is relatively low, but the punching machine is relatively expensive, so this method is not suitable for preparing a small amount of media. Furthermore, with the progress of the information society in recent years, there is an urgent need for recording media with higher density than magnetic recording media. Later, in order to prepare a small amount of recording media, optical recording media for recording / storing data tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/246G11B7/2467G11B7/247G11B7/2472G11B7/252G11B7/253G11B7/2534G11B7/2542G11B7/257G11B7/258G11B7/259G11B23/40
CPCB41M5/506B41M2205/38B41M2205/12G11B7/24G11B7/2542G11B23/40G11B7/2534G11B7/257G11B7/2472G11B7/259G11B7/252G11B7/248G11B7/2467
Inventor 横田千秋须田觉柳町昌俊
Owner MITSUI CHEM INC