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Optical information medium

A technology of optical information and media, applied in the field of optical information media, can solve problems such as insufficient storage capacity and the impact of errors

Inactive Publication Date: 2006-07-19
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 4.7GB single-layer rewritable DVD format is easier to handle than, for example, a conventional CD (Compact Disc), but has insufficient storage capacity for video recording purposes
This requires a skilled optical designer, and the methods described above are susceptible to errors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] in the attached figure 1 A first exemplary embodiment of an erasably recordable optical information medium 20 according to the DVR-Blue format is shown in . A radiation beam 10 having a radiation wavelength λ of 405 nm and a numerical aperture NA of 0.85 is focused in a medium 20 . The medium 20 has a substrate 1 and a stack 2 of layers provided thereon. Stack 2 includes a first recording stack 3 with an IPIM layer structure, in this order, where I is composed of (ZnS) 80 (SiO 2 ) 20 Fabricated dielectric layer, P is a compound with Ge 14 Sb 28 Te 5 8 phase change alloy, M is the metal mirror layer of aluminum (Al). The thicknesses of the layers in IPIM recording stack 3 are 115 nm, 27 nm, 26 nm and 100 nm, respectively. The Al layer is in the vicinity of the substrate 1 . The stack 2 further comprises two radiation beam transmissive layers 4 , 5 . The first transmission layer 4 is made of ultraviolet curing resin, such as Daicure EX-860 provided by Dainippon...

Embodiment 2

[0039] in the attached figure 2 A second exemplary embodiment of an erasably recordable optical information medium 20 according to the DVR-Blue format is shown in . A radiation beam 10 having a radiation wavelength λ of 405 nm and a numerical aperture NA of 0.85 is focused in a medium 20 . The medium 20 has a substrate 1 and a stack 2 of layers provided thereon. The stack 2 comprises a first recording stack 3 identical to the stack 3 described in exemplary embodiment 1 and two radiation beam transmissive layers 6 , 7 . The first transmissive layer 6 is made of a layer of pressure sensitive adhesive (PSA) commercially available from eg 3M. The PSA layer 6 may comprise a transparent backing and / or a carrier layer, such as an optionally surface-treated amorphous polymer layer, such as polyethylene terephthalate (PET) with an adhesive layer on each side. , PC or polymethyl methacrylate (PMMA) layer, but preferably it is a transfer film that does not include a backing and / or ca...

Embodiment 3

[0043] in the attached image 3 A third exemplary embodiment of an erasably recordable optical information medium 20 according to the DVR-Blue format but with an additional second recording layer is shown in . A radiation beam 10 having a radiation wavelength λ of 405 nm and a numerical aperture NA of 0.85 is focused in a medium 20 . The medium 20 has a substrate 1 and a stack 2 of layers provided thereon. The stack 2 comprises a first recording stack 3 , a second recording stack 3 ′ and three radiation beam transmissive layers 11 , 12 , 13 . The first recording stack 3 has an IPIM structure similar to that of the exemplary embodiment 1, including in the following order:

[0044] - Dielectric layer (ZnS) with a thickness of 30 nm 80 (SiO 2 ) 20 ,

[0045] - Compound GeSb with a thickness of 25 nm 2 Te 4 record layer,

[0046] - Dielectric layer (ZnS) with a thickness of 15 nm 80 (SiO 2 ) 20 ,

[0047] - An aluminum mirror layer adjacent to the substrate with a thi...

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Abstract

An optical information medium (20) for recording, such as DVR-blue, and a method for manufacturing such a medium (20) is provided. Reading from and recording onto the medium (20) is performed by means of a focused radiation beam (10) having a radiation wavelength » and a numerical aperture NA. Said medium has a substrate (1), and a stack (2) of layers provided thereon. The stack (2) comprises at least a first recording stack (3) and k radiation beam transmissive layers (4, 5). Each transmissive layer (4, 5) has a refractive index n i and an average thickness d i µm and 1 ‰ i ‰ k and k ‰¥ 2. The thickness d k of layer k (5) is determined by a simple formula which depends on the parameters n i for i = 1...k and d i for i = 1...k-1. Such a medium (20) has zero or substantially zero spherical aberration at the focal point, being at the recording layer of the first recording stack (3), of said radiation beam (10).

Description

[0001] This application is a divisional application of the application No. 01807089.2, the filing date is December 20, 2001, and the invention title is "Optical Information Media and Method for Manufacturing the Media". technical field [0002] The invention relates to an optical information medium for recording by means of a focused radiation beam having a radiation wavelength λ and a numerical aperture NA, said medium having a substrate and a stack of layers provided on the substrate, the stack comprising at least a first a recording stack and k radiation beam transmitting layers, each radiation beam transmitting layer having a refractive index n i and average thickness d i microns, and 1≤i≤k and k≥2. [0003] The invention further relates to a method of manufacturing such an optical information medium. Background technique [0004] An example of such an optical information medium is disclosed in European patent application EP-A-1047055. In particular, the use of a ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/26G11B7/2433G11B7/24027G11B7/2403G11B7/24038G11B7/24067G11B7/243G11B7/254G11B7/2542G11B7/257G11B7/258G11B7/2585
CPCG11B7/2403G11B7/254G11B2007/24314G11B7/257G11B7/26G11B7/2542G11B7/24038G11B7/24067G11B7/243G11B2007/24316G11B7/2585G11B2007/24312Y10T428/21G11B7/24056G11B2007/25705
Inventor B·H·W·亨德里克斯
Owner KONINK PHILIPS ELECTRONICS NV
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