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Optical information recording medium and its manufacture method

A technology for recording media and optical information, applied in temperature recording method, optical recording carrier, recording/reproducing by optical method, etc., which can solve the problems of high cost and reduced corrosion resistance of light reflection layer

Inactive Publication Date: 2008-06-11
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if Ag is used in the light reflection layer, there will be a problem of high cost, and thus it will become a big problem when mass-producing the optical disc.
In addition, depending on the formation conditions, there is a problem that the corrosion resistance of the light reflection layer made of Ag decreases.

Method used

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  • Optical information recording medium and its manufacture method
  • Optical information recording medium and its manufacture method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] On the surface of a substrate made of injection-molded polycarbonate resin having a spiral groove (groove depth: 30nm, groove width: 150nm, track pitch: 340nm) with a thickness of 1.1mm, an outer diameter of 120mm, and an inner diameter of 15mm , in an Ar atmosphere, a light reflection layer made of aluminum (Al: purity 99.9% by mass or more) was formed by DC sputtering. The detailed conditions of sputtering are described in Table 1.

[0070] Then, 2 g of a dye represented by the following chemical formula was added to 100 ml of 2,2,3,3-tetrafluoropropanol and dissolved to prepare a dye coating solution. The pigment coating liquid was coated on the light reflection layer under the conditions of 23° C. and 50% RH by the spin coating method while changing the rotation speed from 300 rpm to 4000 rpm. Then, it was stored at 23° C. and 50% RH for 1 hour to form a recording layer (ingroove thickness: 100 nm, on groove thickness: 70 nm).

[0071] 【Chemical 1】

[0072]

...

Embodiment 2 to 5

[0086] Optical information recording media of Examples 2 to 5 were produced in the same manner as in Example 1 except that the conditions for forming the light reflection layer in Example 1 were changed as shown in Table 1.

[0087] The same test as in Example 1 was performed on the obtained optical information recording medium to evaluate recording characteristics. The results are shown in Table 1.

Embodiment 6 to 19

[0089] Under the conditions shown in Table 1 and an Ar atmosphere, DC sputtering was performed on a substrate made of an injection-molded polycarbonate resin (polycarbonate manufactured by Teijin Corporation; trade name panlaido AD5503) having a thickness of 1.1 mm. A light reflection layer made of aluminum or an aluminum alloy is formed on the surface of a spiral groove (groove depth: 40nm, groove width: 150nm, track pitch: 320nm) with an outer diameter of 120mm and an inner diameter of 15mm. In addition, in Example 7, the Ti content in the aluminum alloy (Al—Ti) was 2 at%.

[0090] Then, 2 g of an organic substance represented by the following chemical formula was mixed with 100 ml of methyl lactate, and dissolved by ultrasonic treatment for 2 hours to prepare a pigment coating liquid. The pigment coating solution was coated on the light reflection layer under the conditions of 23° C. and 50% RH by the spin coating method while changing the rotation speed from 300 to 4000 rp...

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Abstract

An optical information recording medium including a substrate having a groove that has a track pitch of 200 to 400 nm and a depth of 10 to 150 nm, the substrate having successively disposed thereon a light-reflective layer, a recording layer and a cover layer, wherein information is recordable and reproducible by irradiating a laser beam having a wavelength of 500 nm or less from a side of the medium disposed with the cover layer, and the light-reflective layer contains aluminum or an aluminum alloy. The optical information recording medium which reduces a cost and has excellent recording characteristics by using a light reflection layer consisting of aluminum or aluminum alloy.

Description

technical field [0001] The invention relates to an optical information recording medium, in particular to a thermal mode add-on optical information recording medium. Background technique [0002] Heretofore, known are optical information media (optical discs) in which information can be recorded only once by laser light. The optical disc is also referred to as an add-on CD (so-called CD-R), and its typical structure is that a recording layer composed of an organic pigment and an optical layer composed of a metal such as gold are sequentially stacked on a transparent disc-shaped substrate. Reflective layer, protective layer of resin material. In addition, recording information on the CD-R is performed by irradiating the CD-R with laser light in the near-infrared region (usually a laser light with a wavelength around 780nm). Physical or chemical changes (such as groove formation), the optical properties of the part change, so that information recording takes place. In addit...

Claims

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Application Information

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IPC IPC(8): G11B7/24B41M5/26G11B7/007G11B7/244G11B7/258
CPCG11B7/24079G11B7/249G11B7/007G11B7/246G11B7/2478G11B7/258G11B7/24G11B7/2534G11B7/257G11B7/2585G11B7/2472G11B7/2467G11B7/248G11B7/2533Y10T428/21
Inventor 石田寿男宇佐美由久
Owner FUJIFILM CORP
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