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WO2005091285A1 - Procede de production d'une couche transparente de disque optique - Google Patents

Procede de production d'une couche transparente de disque optique Download PDF

Info

Publication number
WO2005091285A1
WO2005091285A1 PCT/KR2005/000804 KR2005000804W WO2005091285A1 WO 2005091285 A1 WO2005091285 A1 WO 2005091285A1 KR 2005000804 W KR2005000804 W KR 2005000804W WO 2005091285 A1 WO2005091285 A1 WO 2005091285A1
Authority
WO
WIPO (PCT)
Prior art keywords
transparent layer
optical disk
bump
denotes
spinning speed
Prior art date
Application number
PCT/KR2005/000804
Other languages
English (en)
Inventor
Myong-Do Ro
Hee-Sung Park
Original Assignee
Samsung Electronic Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronic Co., Ltd. filed Critical Samsung Electronic Co., Ltd.
Publication of WO2005091285A1 publication Critical patent/WO2005091285A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B1/00—Knobs or handles for wings; Knobs, handles, or press buttons for locks or latches on wings
    • E05B1/0015—Knobs or handles which do not operate the bolt or lock, e.g. non-movable; Mounting thereof
    • 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

Definitions

  • the present invention relates to a method of manufacturing a transparent layer of an optical disk, and more particularly, to a method of manufacturing a transparent layer of an optical disk, which can control the radius of a bump according to transparent layer manufacturing conditions.
  • optical disks are widely used as information recording media for optical pickups that record and reproduce information in a non-contact manner.
  • the optical disks are classified into compact disks (CDs), digital versatile disks (DVDs), and Blu- ray disks (BDs) according to information recording capacity.
  • the optical disks generally have a diameter of 120 mm or 80 mm under standards.
  • the BDs include a transparent layer with a thickness of 0.1 mm through which an incident beam is transmitted to reproduce or record information.
  • the transparent layer is made of a curable acrylate resin.
  • the resin is a visco-elastic material having both viscosity and elasticity.
  • elasticity is a mechanical property of a resin to return to its original shape after it has been deformed due to stress according to Hook's law. Due to the property, when a transparent layer is formed by a spin coating method, the resin is puffed up around an outer circumference of the transparent layer after spinning, thereby forming a bump. Thereafter, when the resin is hardened by exposure of ultraviolet, the bump is hardened.
  • the standards for BD-RW(Rewritabe) disks specify that when an optical disk has a radius of 60 mm, the radius of an information recording area should ranges from 21.0 to 58.5 mm. Accordingly, if the information recording area has a radius of 58.5 mm, a rim area formed around an outer circumference of the information recording area has a small radius of 1.5 mm, and a bump should be formed within the rim area. Disclosure of Invention Technical Problem
  • next generation information storage media require that the width of the rim area should be reduced to 1.0 mm or less from the present width of 1.5 mm to enhance recording capacity.
  • the uniformity of the thickness of the transparent layer need to increase and the bump needs to be formed as near as possible to an outermost circumference.
  • the present invention provides a method of manufacturing a transparent layer of an optical disk, which can control the radius of a bump by grasping and using a relationship between the thickness of the transparent layer and the position of the bump and factors that determine the thickness of the transparent layer.
  • a method of manufacturing a transparent layer of an optical disk that includes an information recording area and a rim area with a predetermined width formed along an edge of the information recording area, the method comprising: setting the size of the optical disk, the position of a bump formed in the rim area, the material of the transparent layer, and dispensing conditions; calculating the spinning speed of a stage on which the transparent layer is to be formed using the set values and the following equation
  • r' denotes the radius of the bump
  • R denotes the radius of the optical disk
  • ? denotes the viscosity coefficient of the material of the transparent layer
  • r denotes the density of the material of the transparent layer
  • s denotes the surface tension of the material of the transparent layer
  • Q denotes the quantity of flow
  • w denotes the angular speed of rotation of the stage
  • FIGS. 1A through 1C are graphs illustrating positions of bumps when transparent layers respectively with viscosities of 1300 centipoises (cps), 3000 cps, and 5000 cps are formed on optical disks with a diameter of 32 mm.
  • FIGS. 2A through 2C are graphs illustrating positions of bumps when transparent layers respectively with viscosities of 1300 cps, 3000 cps, and 5000 cps are formed on optical disks with a diameter of 50 mm.
  • FIGS. 3A through 3C are graphs illustrating positions of bumps when transparent layers respectively with viscosities of 1300 cps, 3000 cps, and 5000 cps are formed on optical disks with a diameter of 120 mm.
  • FIGS. 4 through 6 are graphs when optical disks respectively have diameters of 32 mm, 50.8 mm, and 120 mm, particularly, FIGS. 4A, 5A, and 6A illustrating a relationship between a spinning speed and an average coating thickness, FIGS. 4B, 5B, and 6B illustrating a relationship between a spinning speed and a standard deviation.
  • FIGS. 7A through 7C are graphs illustrating a relationship between a spinning speed and a value r'/R when optical disks respectively have diameters of 32 mm, 50.8 mm, and 120 mm.
  • FIGS. 8 A through 8C are graphs illustrating relations between the viscosity of a resin, a spinning speed, and the position of a bump when optical disks respectively have diameters of 32 mm, 50.8 mm, and 120 mm. Best Mode
  • a method of manufacturing a transparent layer of an optical disk according to an embodiment of the present invention grasps through experiments a relationship between the thickness of the transparent layer and the position of a bump and factors that determine the thickness of the transparent layer, analyzes the grasped data through regression analysis, and numerically expresses the analyzed results.
  • the width of the bump depends on the viscosity of a resin used for manufacturing the transparent layer, a spinning speed during spin coating of the resin, a spinning time, and the thickness of the transparent layer made of the resin. That is, the thickness of the transparent layer is determined by the spinning speed and the spinning time of a stage on which the transparent layer is to be formed and the viscosity of the resin, and the width of the bump is determined by the determined thickness and the viscosity of the resin.
  • the stage on which the transparent layer is to be formed by a spin coating method may be a substrate of an optical disk subjected to stamping.
  • the thickness of the transparent layer increases as the spinning speed and the spinning time of the stage increase, and the thickness of the transparent layer decreases as the viscosity of the resin decreases.
  • the width of the bump increases as the thickness of the transparent layer increases. This relationship will be explained in detail through experiments.
  • FIGS. 1A through 1C are graphs illustrating positions of bumps when transparent layers respectively with viscosities of 1300 centipoises (cps), 3000 cps, and 5000 cps are formed on optical disks with a diameter of 32 mm.
  • the horizontal axis represents a ratio r/R of the radius r of a bump to the radius R of an optical disk
  • the vertical axis represents a ratio h/h ave of the thickness h at each position to the average thickness h ave of a transparent layer.
  • FIGS. 2A through 2C are graphs illustrating positions of bumps when transparent layers respectively with viscosities of 1300 cps, 3000 cps, and 5000 cps are formed on optical disks with a diameter of 50 mm.
  • FIGS. 3A through 3C are graphs illustrating positions of bumps when transparent layers respectively with viscosities of 1300 cps, 3000 cps, and 5000 cps are formed on optical disks with a diameter of 120 mm.
  • FIGS. 4 through 6 are graphs when optical disks respectively have diameters of 32 mm, 50.8 mm, and 120 mm. Particularly, FIGS. 4A, 5A, and 6A illustrate a relationship between a spinning speed and an average coating thickness, and FIGS. 4B, 5B, and 6B illustrate a relationship between a spinning speed and a standard deviation. Referring to the graphs, a relationship between a spinning speed and an average coating thickness and a relationship between a spinning speed and a standard deviation are constant in all the optical disks, irrespective of the size of the optical disks.
  • ? denotes the viscosity coefficient of a fluid
  • ? denotes the density of the material of the transparent layer
  • s denotes the surface tension of the material of the transparent layer
  • R denotes the radius of the optical disk
  • ? denotes the angular speed of rotation of the stage on which the transparent layer is to be formed
  • Q denotes the quantity of flow.
  • the variables in equation 1 are defined as non-dimensional variables according to Buckingham's PI theorem of dimensional analysis as shown in equation 2. Referring to equation 2, a ratio of the position r' of the bump to the radius R of the optical disk can be expressed in terms of three non-dimensional values. In equation 2, if the left side of the equation is 1, it means that no bump has been generated. If the left side of the equation is lower than 1, the bump is formed closer to an inner side of the radius of the transparent layer.
  • FIGS. 7A through 7C are graphs illustrating a relationship between a spinning speed and a value r'/R calculated based on equation 2 and obtained by experiments, when optical disks respectively have diameters of 32 mm, 50.8 mm, and 120 mm.
  • FIGS. 8A through 8C are graphs illustrating relations between the viscosity of a resin, a spinning speed, and the position of a bump when optical disks respectively have diameters of 32 mm, 50.8 mm, and 120 mm.
  • the spinning speed of the stage can be calculated based on equation 2 to generate the bump at a desired position.
  • the bump can be generated at a desired position by rotating the stage at the calculated spinning speed, the width of the rim area can be freely adjusted.
  • the bump can be generated within 1 mm from the outer circumference of the optical disk.
  • the method of manufacturing a transparent layer of an optical disk according to the present invention can generate a bump at a desired position by grasping factors that determine the position of the bump, inputting the factors in equation 2, and controlling the spinning speed of a stage. That is, the method can freely adjust the width of the rim area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé de production d'une couche transparente d'un disque optique lequel permet d'établir le rayon d'une bosse selon les conditions de production de la couche transparente. Le procédé consiste: à définir la taille du disque optique, la position d'une bosse formée dans la zone de bord, le matériau de la couche transparente et les conditions de distribution; à calculer la vitesse de mise en rotation d'un plateau sur laquelle la couche transparente est formée à l'aide des valeurs de consigne et de l'équation 1.
PCT/KR2005/000804 2004-03-19 2005-03-19 Procede de production d'une couche transparente de disque optique WO2005091285A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2004-0018749 2004-03-19
KR1020040018749A KR20050093423A (ko) 2004-03-19 2004-03-19 광디스크의 광투과층 제조방법

Publications (1)

Publication Number Publication Date
WO2005091285A1 true WO2005091285A1 (fr) 2005-09-29

Family

ID=34993941

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2005/000804 WO2005091285A1 (fr) 2004-03-19 2005-03-19 Procede de production d'une couche transparente de disque optique

Country Status (2)

Country Link
KR (1) KR20050093423A (fr)
WO (1) WO2005091285A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1128591A (ja) * 1997-07-07 1999-02-02 Hitachi Electron Eng Co Ltd テクスチャ加工装置
US5875084A (en) * 1993-11-10 1999-02-23 International Business Machines Corporation Magnetic recording disk having protrusions centered in respective depressions
US6108169A (en) * 1997-12-03 2000-08-22 Quantum Corporation Randomly laser-textured magnetic recording media

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5875084A (en) * 1993-11-10 1999-02-23 International Business Machines Corporation Magnetic recording disk having protrusions centered in respective depressions
JPH1128591A (ja) * 1997-07-07 1999-02-02 Hitachi Electron Eng Co Ltd テクスチャ加工装置
US6108169A (en) * 1997-12-03 2000-08-22 Quantum Corporation Randomly laser-textured magnetic recording media

Also Published As

Publication number Publication date
KR20050093423A (ko) 2005-09-23

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