WO2003069610A1 - Support d'enregistrement optique de type disque - Google Patents

Support d'enregistrement optique de type disque Download PDF

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Publication number
WO2003069610A1
WO2003069610A1 PCT/JP2003/000527 JP0300527W WO03069610A1 WO 2003069610 A1 WO2003069610 A1 WO 2003069610A1 JP 0300527 W JP0300527 W JP 0300527W WO 03069610 A1 WO03069610 A1 WO 03069610A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
area
recording medium
protrusion
optical recording
Prior art date
Application number
PCT/JP2003/000527
Other languages
English (en)
Japanese (ja)
Inventor
Shoji Akiyama
Jun Nakano
Original Assignee
Sony Corporation
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 Sony Corporation filed Critical Sony Corporation
Publication of WO2003069610A1 publication Critical patent/WO2003069610A1/fr

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Classifications

    • 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
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24047—Substrates

Definitions

  • the present invention relates to a disk-shaped optical recording medium having a protrusion protruding from a cover layer.
  • a CD Compact Disc
  • the CD is, in order from the side where the laser light 81 condensed by the lens 80 hits, a transparent disk substrate 82 of about 1.2 mm thickness, a reflective film 83 coated thereon, and a reflective film 83 And a protective film (UV hardening resin) 84 coated in this order.
  • a metal reflection film having a high reflectance for example, aluminum is used.
  • FIG. 7 shows a DVB (Digital Versatile Disc or Digita 1 Video Disc) having a two-layer structure.
  • DVB Digital Versatile Disc or Digita 1 Video Disc
  • the two boards 92a and 92b of the marauder are stuck together to give a thickness of 1.2mm.
  • a semipermeable membrane (two layers, L-one layer) 93a is provided on the side irradiated with the laser light 91 condensed by the lens 90.
  • a reflection film (one layer portion, L-0 layer) 93 b is provided via the intermediate layer 94.
  • reference numeral 101 denotes a single-layer optical disc for high-density recording having a structure using a thin cover layer.
  • the optical disc 101 is configured by sequentially laminating a reflective film or a recording film 103 and a cover layer 104 on one main surface of the substrate 102.
  • the laser light condensed by the lens 105 having a high numerical aperture (NA) is applied to the reflection film or the recording film 103.
  • reference numeral 111 denotes a configuration of an optical disk for high-density recording having a two-layer structure. As shown in FIG. 9, this high-density disk 111 is composed of a reflective film 113, an intermediate layer 114, a semi-permeable film 115, and a cover layer 116 on a substrate 112. Are sequentially laminated. Disclosure of the invention
  • the invention according to claim 1 includes a substrate, a signal recording layer formed on the substrate, a cover layer formed on the signal recording layer, and a central portion.
  • a disc-shaped recording medium having an opening, the first area being larger than the diameter of the clamp area around the opening and smaller than the inner diameter of the signal area; and the first area being larger than the outer diameter of the signal area.
  • a disc-shaped optical recording medium characterized in that the substrate has a ring-shaped protrusion in at least one of the second area smaller than the diameter, and a tip of the protrusion protrudes from the cover layer.
  • the signal reading surface is damaged even when the signal reading surface is placed down or placed on the signal reading surface. Can be difficult.
  • the protrusion since the protrusion is provided on the substrate, the protrusion can be formed integrally with the substrate.
  • the signal recording layer means a reflection film or a recording film.
  • FIG. 1A is a sectional view showing an optical disc according to an embodiment of the present invention.
  • FIG. 1B is a partially enlarged sectional view of a sectional view showing an optical disc according to an embodiment of the present invention.
  • FIG. 2 is a view for explaining an example of a projection in one embodiment of the present invention.
  • FIG. 3 is a schematic diagram for explaining another example of the protrusion.
  • FIG. 4 is a cross-sectional view of an injection molding apparatus for molding a substrate having projections.
  • FIG. 5 is a sectional view of a mold of the injection molding apparatus.
  • FIG. 6 is a cross-sectional view of an example of a conventional optical disk.
  • FIG. 7 is a sectional view of another example of the conventional optical disk.
  • FIG. 8 is a sectional view showing an optical disk having a single-layer structure for high-density recording.
  • FIG. 9 is a sectional view showing an optical disk for high density recording having a two-layer structure.
  • reference numeral 1 indicates an optical disc according to an embodiment of the present invention.
  • the optical disc 1 has the same configuration as the optical disc 101 described with reference to FIG. That is, the optical disk 1 is configured such that a reflective film or a recording film 3 and a cover layer 4 are sequentially laminated on one main surface of a substrate 2.
  • the substrate 2 is made of a low water-absorbing resin such as, for example, polycarbonate (P C) cyclorefin polymer.
  • P C polycarbonate
  • the laser light condensed by the lens 5 having a high aperture (NA) is applied to the reflection film or the recording film 3.
  • the lens 5 has a configuration in which two lenses are bonded, and NA is 0.85.
  • a phase change film is used as the reflection film or the recording film 3.
  • a center hole (opening) 6 is formed at the center of the substrate 2, and the thickness of the periphery of the center hole 6 is smaller than that of the signal area where the cover layer 4 is provided. It is configured to be large.
  • the disk diameter is 120, and the diameter (inner diameter) of the center hole 6 is 15 mm.
  • the periphery of the center hole 6 is a clamp area 7, and a signal area 8 is provided on the outer peripheral side.
  • the cover layer 4 is applied so as to cover the entire signal area 8.
  • the cover layer 4 is not provided, and the thickness of the substrate 2 is slightly increased so that the thickness is equal to the area (1.2 mm) in which the cover layer 4 is provided. I have.
  • An inner peripheral projection 9 a is formed integrally with the substrate 2 in a first area that is larger than the diameter of the clamp area 7 around the center hole 6 and smaller than the inner diameter of the signal area 8.
  • An outer peripheral projection 9b is formed integrally with the substrate 2 in a second area larger than the outer diameter of the signal area 8 and smaller than the disk diameter.
  • these projections 9a and 9b are formed continuously and circumferentially.
  • the heights h a and h b of the projections 9 a and 9 b are selected so that their tips protrude from the surface of the cover layer 4.
  • the substrate 4 has both the inner peripheral protrusion 9a and the outer peripheral protrusion 9b, but at least one of them may be provided. Further, these projections 9a and 9b are not formed continuously in a circumferential shape (ring shape), but intermittently along the circumference as shown in FIG. 3, that is, in a ring shape. May be formed by removing a part of them. Further, the shapes of the protrusions 9a and 9b do not need to be flat at the tip, but may be curved.
  • the inner peripheral projection 9 a and the outer peripheral projection 9 b are formed integrally with the substrate 4.
  • an injection molding device indicated by reference numeral 30 in FIG. 4 is used.
  • This injection molding equipment 30 includes a mold 40, an injection unit 31, a hopper 32, a hydraulic motor 33, a mold cylinder 34, a nozzle 35, and the like.
  • the injection unit 31 includes a heating cylinder 36, a screw 37, and the like.
  • FIG. 5 shows an example of a mold 40 provided in the injection molding apparatus.
  • the mold 40 includes a fixed mold section 40A and a movable mold section 40B.
  • the solid-side mold portion 4OA includes a fixed-side mounting plate 41, an outer ring 42, a fixed-side mirror 43, a fixed-side temperature control circuit 44, and a sprue 45.
  • the movable mold part 40 B includes a movable mounting plate 46, a movable mirror 47, a center pin 48, and a gate punch 49.
  • the stamper 21 is loaded at a predetermined position of the fixed mold part 40A. Although omitted here, the center of the stamper is punched out and an opening is formed before the stamper 21 is loaded into the injection molding apparatus. Match the mold part 40B. Then, after the nozzle 35 is brought into contact with the mold inlet, a melted synthetic resin material such as polycarbonate is injected into the mold 40 and solidified. After the substrate 4 is formed, the cover layer 4 is formed.
  • the ring at the position corresponding to the inner peripheral projection 9a and the outer peripheral projection 9b on the surface of the fixed mold section 40A of the mold 40 facing the stamper 21.
  • a concave groove or projection is formed.
  • a ring-shaped concave groove or projection may be formed on the stamper 21.
  • the present invention is not limited to the above-described embodiments of the present invention, and various modifications and applications are possible without departing from the gist of the present invention.
  • the inner peripheral projections 9a and the outer peripheral projections 9b may be in the form of a filler.
  • the lens can be cleaned while preventing the signal reading surface from being damaged.
  • the present invention is not limited to a single-layer disc, and can be applied to a two-layer disc or a multi-layer disc having three or more layers shown in FIG.
  • the method of forming the substrate is not limited to the injection molding method, and a pressing method or the like may be used.
  • the protruding portion is provided on the reading surface side, so that when the disc is placed on a desk or when an object is placed on the disc, the reading surface is Can be prevented from being damaged. Further, when the protrusion is integrally formed with the substrate, a configuration having the protrusion can be easily obtained.

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

Un disque optique (1) est formé par empilement séquentiel, sur la surface principale d'un substrat (2), d'une couche mince de réflexion ou d'une couche mince d'enregistrement (3) et d'une couche de couverture (4). Un faisceau laser concentré sur une lentille (5) apparaît sur la couche mince (3). Un trou central (6) est formé au centre du substrat, avec une zone de serrage (7) l'entourant et une zone de signal (8) prévue sur le côté périphérique extérieur de la zone de serrage. La couche de couverture est déposée de manière à couvrir la totalité de la zone de signal (8). Une partie saillante (9a) de périphérie intérieure est formée solidaire du substrat (2) dans une première zone plus grande en diamètre que la zone de serrage (7) et plus petite en diamètre que la périphérie intérieure de la zone de signal (8), et une partie saillante (9b) de périphérie extérieure est formée solidaire du substrat (2) dans une seconde zone plus grande en diamètre que la périphérie extérieure de la zone de signal (8) et plus petite en diamètre que le disque. Les hauteurs (ha, hb) des parties saillantes (9a, 9b) sont choisies de telle manière que leurs extrémités de pointe dépassent de la surface de la couche de couverture (4).
PCT/JP2003/000527 2002-02-13 2003-01-22 Support d'enregistrement optique de type disque WO2003069610A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002035364A JP2003242680A (ja) 2002-02-13 2002-02-13 ディスク状光記録媒体
JP2002-35364 2002-02-13

Publications (1)

Publication Number Publication Date
WO2003069610A1 true WO2003069610A1 (fr) 2003-08-21

Family

ID=27678053

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/000527 WO2003069610A1 (fr) 2002-02-13 2003-01-22 Support d'enregistrement optique de type disque

Country Status (3)

Country Link
JP (1) JP2003242680A (fr)
TW (1) TW200400500A (fr)
WO (1) WO2003069610A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3961466B2 (ja) 2002-09-05 2007-08-22 松下電器産業株式会社 光情報記録媒体及びその製造方法、並びに光情報記録媒体の保持方法
US7859983B2 (en) 2003-07-15 2010-12-28 Sharp Kabushiki Kaisha Optical disk and optical disk recording and reproducing device
EP1860652B1 (fr) * 2005-03-17 2011-09-28 Panasonic Corporation Dispositif a disque optique
JP4708316B2 (ja) * 2006-11-24 2011-06-22 太陽誘電株式会社 光情報記録媒体

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6040537A (ja) * 1983-08-12 1985-03-02 Matsushita Electric Ind Co Ltd レンズクリ−ニング用光デイスク
JPH0250826U (fr) * 1988-09-30 1990-04-10
JPH02135978U (fr) * 1989-04-17 1990-11-13
JPH032481U (fr) * 1989-05-25 1991-01-11
JPH1074372A (ja) * 1997-04-07 1998-03-17 Sony Corp クリーナディスク
JPH10269621A (ja) * 1997-03-25 1998-10-09 Sony Corp 光ディスク基板及びこれを用いた光ディスク
JPH11345431A (ja) * 1998-06-01 1999-12-14 Toshiba Corp 情報記録媒体
JP2000242978A (ja) * 1999-02-18 2000-09-08 Hitachi Ltd 光ディスクおよび光ディスク装置
JP2001023238A (ja) * 1999-07-02 2001-01-26 Hitachi Maxell Ltd 情報記録媒体
JP2001319386A (ja) * 2000-05-01 2001-11-16 Sony Chem Corp 凸状樹脂膜の形成方法及び光学的記録媒体
JP2002184037A (ja) * 2000-04-25 2002-06-28 Matsushita Electric Ind Co Ltd 光ディスクおよびその製造方法ならびに光ディスクの製造装置
JP2002342977A (ja) * 2001-05-15 2002-11-29 Victor Co Of Japan Ltd 光情報記録媒体

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6040537A (ja) * 1983-08-12 1985-03-02 Matsushita Electric Ind Co Ltd レンズクリ−ニング用光デイスク
JPH0250826U (fr) * 1988-09-30 1990-04-10
JPH02135978U (fr) * 1989-04-17 1990-11-13
JPH032481U (fr) * 1989-05-25 1991-01-11
JPH10269621A (ja) * 1997-03-25 1998-10-09 Sony Corp 光ディスク基板及びこれを用いた光ディスク
JPH1074372A (ja) * 1997-04-07 1998-03-17 Sony Corp クリーナディスク
JPH11345431A (ja) * 1998-06-01 1999-12-14 Toshiba Corp 情報記録媒体
JP2000242978A (ja) * 1999-02-18 2000-09-08 Hitachi Ltd 光ディスクおよび光ディスク装置
JP2001023238A (ja) * 1999-07-02 2001-01-26 Hitachi Maxell Ltd 情報記録媒体
JP2002184037A (ja) * 2000-04-25 2002-06-28 Matsushita Electric Ind Co Ltd 光ディスクおよびその製造方法ならびに光ディスクの製造装置
JP2001319386A (ja) * 2000-05-01 2001-11-16 Sony Chem Corp 凸状樹脂膜の形成方法及び光学的記録媒体
JP2002342977A (ja) * 2001-05-15 2002-11-29 Victor Co Of Japan Ltd 光情報記録媒体

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Publication number Publication date
TW200400500A (en) 2004-01-01
JP2003242680A (ja) 2003-08-29

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