Optical recording medium

一种光学记录介质、记录层的技术，应用在光学记录载体、用光学方法记录/重现、数据记录等方向，能够解决不适用大量生产等问题

Inactive Publication Date: 2003-03-26
MITSUI CHEM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is of course not suitable for mass production

Method used

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  • Optical recording medium
  • Optical recording medium

Examples

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Embodiment 1～8 and comparative Embodiment 1～8

[0059] A 20 g / l solution of one of the pyrrolomethylene dyes represented by structural formulas (A) to (C) in ethylcyclohexane was spin-coated on an injection-molded polycarbonate substrate to form a dye layer, the substrate It has a thickness of 0.6 mm, a diameter of 120 mmΦ, a helical groove with a pitch of 0.74 μm, and a pre-pit on the extension line of the pre-groove that is partially introduced into the area. A 100 nm Au reflective layer was deposited on the dye layer by sputtering. The product was then coated with a UV curable resin SD-17 (Dainippon Ink And Chemicals, Inc.) and UV cured. The aforementioned polycarbonate substrate having a thickness of 0.6 mm was laminated on the resin layer by Z8412 (JSR) radical type adhesive to prepare an optical recording medium.

[0060]The signal modulation coefficient (I14 / I14H) of the optical recording medium was evaluated according to the DVD specification requirements of pre-pits at a wavelength of 658 nm and an NA of 0.60 with...

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Abstract

A recordable optical recording medium comprising a recording layer containing an organic dye which can absorb a laser beam and a metal reflective layer directly or via another layer on a transparent supporting substrate having a pre-groove and a pre-pit, wherein the organic dye has a refractive index nk of 2.2 or more at a reproduction wavelength lambda2; in relation to the reproduction wavelength lambda2, the depths of the pre-groove and the pre-pit on the substrates are more than lambda2 / 4; and the following equations are satisfied:wherein r is a recording laser beam diameter represented by lambda1 / NA where lambda1 is a recording wavelength [mum] and NA is a numerical aperture for an object lens; wg [mum] and thetagr are a half value width and a cross-section tilting angle in a substrate radial direction for the pre-groove, respectively; and wp [mum], thetapr and thetapt are a half value width, a cross-section tilting angle in a substrate radial direction and a cross-section tilting angle in a tangential direction for the pre-pit, respectively.

Description

technical field [0001] The present invention relates to an optical recording medium on which information can be recorded and / or reproduced using a laser beam. In particular, the present invention relates to a hybrid high-density optical recording medium, which is a recording density higher than that of CDs and includes pre-pits and pre-grooves on a substrate. A recordable recording medium. Background technique [0002] Among the disc-type media used for optical recording, the recordable compact disc can be recorded only once, and is widely used because of its compatibility with ordinary read-only CD-ROMs. For Digital Versatile Discs (DVDs) with higher recording densities than CDs, recordable media have been developed, of which recordable DVDRs are expected to gain favor because of their higher compatibility with DVD-ROMs. These recordable media employ organic dyes in the recording layer, where the dyes irradiated by a laser beam are locally heated to undergo chemical and / o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B3/02G11B7/007G11B7/013G11B7/24079G11B7/24085G11B7/246G11B7/2492G11B7/258
CPCG11B7/24079G11B7/246G11B7/2492G11B7/258G11B7/24085Y10T428/21G11B7/2407
Inventor 小出哲裕稻富裕司小池正士
Owner MITSUI CHEM INC
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