KR20010055044A - Spin coating method of optical disk for removing edge effect - Google Patents

Spin coating method of optical disk for removing edge effect Download PDF

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Publication number
KR20010055044A
KR20010055044A KR1019990056105A KR19990056105A KR20010055044A KR 20010055044 A KR20010055044 A KR 20010055044A KR 1019990056105 A KR1019990056105 A KR 1019990056105A KR 19990056105 A KR19990056105 A KR 19990056105A KR 20010055044 A KR20010055044 A KR 20010055044A
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South Korea
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disk
spin coating
housing
optical disk
edge
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KR1019990056105A
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Korean (ko)
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KR100648332B1 (en
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김진홍
김상열
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구자홍
엘지전자 주식회사
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/266—Sputtering or spin-coating layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B7/2542—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • G11B2220/216—Rewritable discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

PURPOSE: A method for spin coating an optical disk is provided to obtain a uniform thickness distribution for entire area of the optical disk through eliminating an edge effect. CONSTITUTION: To produce an optical disk, a spin coating housing is used. Herein, a disk is inserted to the disk housing having a groove to perform the spin coating. Herein, the groove is formed on an upper surface of a disk shape larger than the disk. Then, an edge of the disk is continued from an edge of the disk housing. Thus, an edge effect is prevented by uniformly spraying an ultraviolet ray hardening resin. Herein, an outer circumference of the disk and an inner circumference of the disk housing are precisely identified while precisely identifying a depth of the disk housing and a thickness of the disk.

Description

에지효과 제거를 위한 광 디스크의 스핀 코팅 방법{Spin coating method of optical disk for removing edge effect}Spin coating method of optical disk for removing edge effect

본 발명은 광 디스크의 스핀 코팅 방법에 관한 것으로, 특히 광 디스크의 에지(edge)효과를 줄일 수 있는 광 디스크 스핀 코팅 방법에 대한 것이다.The present invention relates to a spin coating method of an optical disk, and more particularly, to an optical disk spin coating method that can reduce the edge effect of the optical disk.

광 디스크는 보호막 기능, 기계적 특성 향상 기능, 접착 및 휨(tilt) 방지 기능을 위해 자외선 경화 수지 등을 코팅해야 하는 경우가 많다. 먼저 보호막 기능 및 기계적 특성 향상을 위한 측면에서는 자외선 경화 수지를 코팅함으로 인하여 쉽게 긁혀지는 특성을 갖는 기판 표면이나 기록막이 제작되어 있는 면을 외부로부터 보호하여 궁극적으로 에러(error) 발생 요인을 줄여 주는 역할을 한다. 상기 보호막 기능의 한 가지 더 중요한 기능으로는 고밀도 기록을 위하여 큰 개구수(Numerical Aperture, 줄여서 NA로 표기)를 이용할 때 커버층(cover layer)기능이다. 큰 개구수(NA)는 통상 0.85 정도를 이용하고, 이 때 디스크와 렌즈의 거리가 짧아지기 때문에 기록막 위에 얇은 커버층(cover layer)가 덮여야 한다. 개구수(NA)가 그다지 크지 않은 경우에는 유리(glass)나 폴리 카보네이트(polycarbonate) 기판이 이용되지만, 0.85정도일 때에는 1 mm 정도의 얇은 커버층이 필요한데, 기판 형태로는 제작과 부착이 어렵기 때문에 스핀 코팅(spin coating)을 이용한다.Optical disks often need to be coated with an ultraviolet curable resin for the purpose of protective film function, mechanical property improvement function, adhesion and warp prevention function. First of all, in terms of improving the protective film function and mechanical properties, it protects the surface of the substrate or the surface on which the recording film is easily scratched by coating UV-curable resin from the outside, thereby ultimately reducing errors. Do it. One more important function of the protective film function is the cover layer function when using a large numerical aperture (hereinafter abbreviated NA) for high density recording. As for the large numerical aperture NA, about 0.85 is used normally, At this time, since the distance of a disk and a lens becomes short, a thin cover layer should be covered on a recording film. If the numerical aperture (NA) is not so large, a glass or polycarbonate substrate is used, but when it is about 0.85, a thin cover layer of about 1 mm is required. Spin coating is used.

두 장의 디스크를 부착하는 경우에도 스핀 코팅(spin coating)에 의한 접착제를 도포할 뿐 아니라, 기울어짐(tilt) 방지를 위해 역학적으로 딱딱한(rigid) 디스크를 위해 이 방법을 이용한다. 특히 고밀도화를 위해 렌즈의 개구소(NA)가 증가함에 따라 렌즈와 기판간의 거리가 짧아짐에 따라 기판의 두께가 점차 얇아지는 추세인데, 현재까지는 0.6 mm 정도의 두께가 이용되고 있다. 이 정도의 얇은 두께가 되면, 주로 이용되는 폴리 카보네이트(polycarbonate) 기판의 경우 휘는 현상이 나타나게 된다. 따라서 이 휨 현상을 방지하기 위해 기판에 자외선 경화 수지를 코팅하게 된다. 즉, 자외선 경화 수지를 스핀 코터(spin coater)로 도포한 다음 자외선에 노출 시키면 경화가 되는데, 이때 폴리 카보네이트(polycarbonate) 기판의 휨을 방지 하는 역할을 하게 된다.In the case of attaching two disks, this method is not only applied by spin coating but also used for a mechanically rigid disk to prevent tilting. In particular, as the aperture NA of the lens increases for the purpose of higher density, the thickness of the substrate becomes gradually thinner as the distance between the lens and the substrate becomes shorter. To date, a thickness of about 0.6 mm has been used. If the thickness is as thin as this, the polycarbonate substrate, which is mainly used, will exhibit warpage. Therefore, in order to prevent this warpage phenomenon, a UV curable resin is coated on the substrate. That is, the ultraviolet curable resin is coated with a spin coater (spin coater) and then exposed to ultraviolet light to cure. In this case, the polycarbonate substrate serves to prevent bending of the polycarbonate substrate.

도 1은 ISOM/ODS'99(학술지 명)에 "Over layer technology for high-Nadigital video recording system (page 326~328)"의 제목으로 M.M.J.Decre 등의저자가 발표한 결과를 인용한 것으로, 종래기술의 방법으로 스핀 코팅한 경우 디스크의 에지(edge) 효과에 의해 코팅막의 불균일한 두께를 보여주는 결과다. 이러한 불균일한 두께때문에 디스크의 에지(edge)에 가까운 부분에 기록/재생을 할 경우 에러(error)가 생겨날 가능성이 커지게 된다. 또, 두 장의 디스크를 접착시킬 경우 에지(edge) 부근의 불균일성에 의한 효과 즉, 공기 방울이 생겨 나기도 하며, 휨 방지의 용도로 이용할 경우에도 반지름 방향으로 불균일한 응력 분포 등이 생기는 문제가 있다. 이 중 첫번째 언급한 문제가 가장 중요한 문제가 될것이다.FIG. 1 is a quoting result of an author published by MMJDecre et al. Under the title of “Over layer technology for high-Nadigital video recording system (pages 326 to 328)” in ISOM / ODS'99. In the case of spin coating by the method, the result shows the uneven thickness of the coating film due to the edge effect of the disk. Due to this non-uniform thickness, an error is more likely to occur when recording / reproducing at a portion near the edge of the disc. In addition, when two disks are bonded together, an effect due to nonuniformity near the edge, that is, air bubbles are generated, and even when used for the purpose of bending prevention, there is a problem that a nonuniform stress distribution occurs in the radial direction. The first of these will be the most important.

본 발명은 이러한 문제들을 해결하기 위해 광 디스크에 스핀 코팅을 할 때 에지(edge)효과가 나타나지 않는 새로운 스핀 코팅 방법을 제시하고자 한다.In order to solve these problems, the present invention proposes a novel spin coating method that does not exhibit an edge effect when spin coating an optical disk.

도 1은 종래 기술에서 자외선 경화 수지를 스핀 코팅했을 때 나타나는 에지 (edge)효과를 나타내는 도면.1 is a view showing the edge (edge) effect that appears when spin coating the ultraviolet curable resin in the prior art.

도 2(a)는 본 발명의 스핀 코팅 방법에 사용되는 디스크 하우징의 평면도.Figure 2 (a) is a plan view of a disk housing used in the spin coating method of the present invention.

도 2(b)는 광 디스크의 평면 구조.Figure 2 (b) is a planar structure of the optical disk.

도 3은 본 발명의 스핀 코팅 방법에 사용되는 디스크 하우징의 단면도.3 is a cross-sectional view of a disk housing used in the spin coating method of the present invention.

일반적으로 광디스크는 폴리 카보네이트(Polycarbonate)와 같은 투명 기판 위에 제 1유전체층, 기록층, 제 2유전체층, 반사층 및 보호층 등으로 구성된다. 여기서 기록층은 상변화 물질이나 광자기 특성을 갖는 기록 물질을 사용할 수 있으며 정보가 기록된 디스크 표면을 보호하기 위해 디스크의 맨 위에 보호층을 형성한다.이 때 보호층은 일반적으로 자외선 경화수지(Ultra Violet resin)를 사용하는데 자외선 경화수지는 스핀 코팅에 의해 디스크 표면에 얇게 도포한 뒤 자외선으로 경화시키게 된다.In general, an optical disc is composed of a first dielectric layer, a recording layer, a second dielectric layer, a reflective layer, a protective layer, and the like on a transparent substrate such as polycarbonate. The recording layer may be a phase change material or a recording material having magneto-optical properties, and a protective layer is formed on top of the disk to protect the surface of the disk on which information is recorded. Ultra Violet Resin (UV) curable resin is applied to the surface of disk by spin coating, and then cured by UV.

본 발명의 기본 원리는 도 2와 3에 나타나 있다. 여기서 광 디스크 제조시 기판 위에 유전체층과 기록층 등이 형성본 발명의 기본 아이디어는 스핀코팅을 할 때 도면 2, 3과 같은 스핀코팅용 하우징(housing)을 이용함을 특징으로 한다. 즉, 스핀 코팅할 때, 도 2의 (a) 와 같이 디스크보다 큰 원판 형태의 윗면에 디스크 장착을 위한 홈이 파져 있는 디스크 하우징(housing)에 (b)와 같은 디스크를 넣은 후에 스핀 코팅을 한다. 이렇게 할 경우 디스크의 에지(edge)부분과 디스크 하우징(housing)의 에지(edge)부분이 연속되기 때문에 종래 방법과 같은 에지(edge) 효과가 생겨나지 않게 된다. 즉, 자외선 경화수지가 디스크의 내경(안쪽 지름) 쪽이나 외경(바깥 지름) 쪽 모두 균일하게 도포된다. 이 때, 주의해야 할 점은 디스크의 외경과 디스크 하우징(housing)의 내경이 정확히 일치해야 하고, 도 3 에 나타난 디스크 하우징(housing)의 깊이(D)와 디스크의 두께가 정확히 일치해야 한다.The basic principle of the invention is shown in FIGS. 2 and 3. Here, a dielectric layer, a recording layer, and the like are formed on a substrate when the optical disc is manufactured. The basic idea of the present invention is to use a spin coating housing as shown in FIGS. 2 and 3 when spin coating. That is, when spin coating, spin coating is performed after inserting a disk such as (b) into a disc housing having a groove for mounting a disk on the upper surface of a disk larger than the disk as shown in FIG. . In this case, since the edge portion of the disc and the edge portion of the disc housing are continuous, the edge effect as in the conventional method does not occur. That is, the ultraviolet curable resin is uniformly applied to both the inner diameter (inner diameter) side and the outer diameter (outer diameter) side of the disk. At this time, it should be noted that the outer diameter of the disk and the inner diameter of the disk housing must exactly match, and the depth D of the disk housing shown in FIG. 3 and the thickness of the disk must match exactly.

본 발명과 같은 방법을 적용하여 광 디스크를 제조할 경우, 디스크의 에지(edge)와 디스크 하우징(housing)의 에지(edge)가 연속되기 때문에 종래 기술의 에지 효과(edge effect)를 제거 할 수 있다. 따라서 에지 효과(edge effect)에 의한 자외선 경화수지 코팅막의 두께 불균일성으로부터 생겨나는 기록/재생시의 에러(error)나 접착시의 기포 및 디스크의 휨 방지가 가능하게 된다.When the optical disc is manufactured by applying the same method as the present invention, the edge effect of the prior art can be eliminated because the edge of the disc and the edge of the disc housing are continuous. . Therefore, it is possible to prevent errors in recording / reproducing, bubbles during adhesion, and warping of the disk and discs caused by the thickness nonuniformity of the ultraviolet curable resin coating film due to the edge effect.

Claims (2)

기판상에 제 1유전체층, 기록층, 제 2유전체층, 반사층 및 자외선 경화 수지로 이루어진 보호층을 포함하는 광 디스크 제조 방법에 있어서,An optical disc manufacturing method comprising a protective layer made of a first dielectric layer, a recording layer, a second dielectric layer, a reflective layer, and an ultraviolet curable resin on a substrate, 상기 디스크의 외경과 같은 내경을 갖고 디스크가 장착되는 홈의 깊이가 디스크 두께와 같은 디스크 하우징에 디스크를 장착하여 자외선 경화수지를 스핀 코팅하는 단계를 포함하는 광 디스크 제조 방법.And mounting a disk in a disk housing having an inner diameter equal to an outer diameter of the disk and having a groove in which the disk is mounted, the disk thickness being equal to the disk thickness, and spin coating the ultraviolet curable resin. 제 1항에 있어서,The method of claim 1, 상기 광 디스크는 상변화 물질이나 광자기 기록 물질을 포함하는 재기록 가능형(rewritable) 디스크, 기록 가능형(recordable)디스크, 또는 재생전용(ROM)디스크 중 어느 하나임을 특징으로 하는 광 디스크 제조 방법.And the optical disc is any one of a rewritable disc, a recordable disc, and a read-only disc including a phase change material and a magneto-optical recording material.
KR1019990056105A 1999-12-09 1999-12-09 Method for manufacturing optical disc KR100648332B1 (en)

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KR20030055952A (en) * 2001-12-27 2003-07-04 엘지전자 주식회사 Method for coating of cover layer in reverse tracking type disc
KR100608623B1 (en) * 2001-12-21 2006-08-09 엘지전자 주식회사 Method for coating of cover layer in reverse tracking type disk
US7632352B2 (en) 2004-12-10 2009-12-15 Lg Chem, Ltd. Spin-coating apparatus and coated substrates prepared using the same

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Publication number Priority date Publication date Assignee Title
KR100608623B1 (en) * 2001-12-21 2006-08-09 엘지전자 주식회사 Method for coating of cover layer in reverse tracking type disk
KR20030055952A (en) * 2001-12-27 2003-07-04 엘지전자 주식회사 Method for coating of cover layer in reverse tracking type disc
US7632352B2 (en) 2004-12-10 2009-12-15 Lg Chem, Ltd. Spin-coating apparatus and coated substrates prepared using the same

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