WO1998010418A1 - Disques optiques a tres haute densite a une face - Google Patents

Disques optiques a tres haute densite a une face Download PDF

Info

Publication number
WO1998010418A1
WO1998010418A1 PCT/IB1997/001237 IB9701237W WO9810418A1 WO 1998010418 A1 WO1998010418 A1 WO 1998010418A1 IB 9701237 W IB9701237 W IB 9701237W WO 9810418 A1 WO9810418 A1 WO 9810418A1
Authority
WO
WIPO (PCT)
Prior art keywords
region
thickness
disc
discs
super
Prior art date
Application number
PCT/IB1997/001237
Other languages
English (en)
Inventor
William Mueller
Original Assignee
Wea Manufacturing, Inc.
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 Wea Manufacturing, Inc. filed Critical Wea Manufacturing, Inc.
Priority to EP97941171A priority Critical patent/EP0858657A4/fr
Priority to AU43171/97A priority patent/AU718994C/en
Priority to JP10512428A priority patent/JPH11515131A/ja
Publication of WO1998010418A1 publication Critical patent/WO1998010418A1/fr

Links

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

Definitions

  • This invention relates to the shaping of plastic compact discs (CD's) by injection molding for storing data in an optical medium.
  • CD's plastic compact discs
  • This invention relates to the provision of super-density compact discs where only one surface is required for the storage of information.
  • Plastic discs having a pit optical track structure are well known as compact discs.
  • Double sided discs in which information is recorded on two sides of such a structure formed by binding two compact discs and apparatus for playing such discs is also well known, as in U.S. patents 4,903,140; 4,939,011/ 5,097,465; 4,811,324.
  • compact disc as used in thi ⁇ application includes any disc shaped recorded medium having pits and lands forming an optical track structure on a data information recording planar surface. Thus it includes such discs where the information stored as pits and lands is digital information or analog information.
  • Digital information may be encoded into the pits and lands as pits of quantized lengths interpretable as a stream of digital data, wherein the length of each pit or land segment may be, for example, related to the number of l's or O's in a data stream.
  • An example of such a system is the compact disc ("CD" ⁇ audio or video disc.
  • Analog information may be encoded into the pits and lands as pit lengths that may vary over a continuum of values, wherein the length of each pit or land segment may be, for example, related to a voltage level in a desired output.
  • An example of such a system is the laser disc video recording system.
  • the present invention is a novel compact disc.
  • Such discs are known to be plastic discs having pits and lands representing optically recorded data on an internal surface in which the internal surface carries a light reflective film and is overcoated by a transparent layer, that exposes a flat surface.
  • two such discs are bonded to each other back to back. Where there is only the need for one surface to carry data the second disc is blank.
  • the present invention provides a way to economize on the steps required for the manufacture of such discs .
  • the d sc has two thickness regions.
  • the first thickness region is a central cylindrical region.
  • the second thickness region is the remaining annular region of the disc and has only a fraction of the thickness of said first region, said fraction being less than 3/4 and more than 1/4.
  • the second annular region is overcoated with materials of different composition.
  • Figure 1 depicts a prior art system employing a thin compact disc bonded to a blank compact disc to result in a disc that is usable in a double sided system even though all the data is present on only one side thereof.
  • Figure 2 depicts a preferred embodiment of the present invention using a compact disc the plastic portion of which has substantial variations in thickness.
  • the invention comprises a plastic disc having pits and lands representing optically recorded data on an internal surface thereof, the internal surface having a light reflective film thereon, and the surface being overcoated by a transparent layer exposing a flat surface.
  • the disc has first and second thickness regions.
  • the first thickness region is a central cylindrical region of a first predetermined thickness.
  • the second thickness region comprises the remaining annular region of the disc and has a fraction of the thickness of said first region, the fraction being less than 3/4 and more than 1/4.
  • the annular region is then overcoated with materials of different composition.

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

La présente invention concerne un disque compact comprenant des données numériques à enregistrement optique et présentant deux zones d'épaisseur. La première zone d'épaisseur est une zone centrale cylindrique (1,2 mm), la deuxième zone d'épaisseur est la zone annulaire restante du disque (0,6 mm), qui comprend une zone d'étiquetage (étiquette appliquée) et qui présente une épaisseur inférieure à 3/4 et supérieure à 1/4 de l'épaisseur de la première zone.
PCT/IB1997/001237 1996-09-05 1997-09-05 Disques optiques a tres haute densite a une face WO1998010418A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97941171A EP0858657A4 (fr) 1996-09-05 1997-09-05 Disques optiques a tres haute densite a une face
AU43171/97A AU718994C (en) 1996-09-05 1997-09-05 Single surfaced super-density optical discs
JP10512428A JPH11515131A (ja) 1996-09-05 1997-09-05 片面超高密度光ディスク

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70888696A 1996-09-05 1996-09-05
US08/708,886 1996-09-05

Publications (1)

Publication Number Publication Date
WO1998010418A1 true WO1998010418A1 (fr) 1998-03-12

Family

ID=24847563

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1997/001237 WO1998010418A1 (fr) 1996-09-05 1997-09-05 Disques optiques a tres haute densite a une face

Country Status (3)

Country Link
EP (1) EP0858657A4 (fr)
JP (1) JPH11515131A (fr)
WO (1) WO1998010418A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1291874A2 (fr) * 2001-08-10 2003-03-12 Wea Manufacturing Inc. Procédé et appareil pour réduire la contraction de la région de serrage d'un disque optique, et disque optique obtenu
EP1921618A1 (fr) * 2005-08-30 2008-05-14 TROPILLO, Andrei Vladimirovich Support de donnees en forme de disque
EP1971982A2 (fr) * 2005-03-03 2008-09-24 Enxnet, Inc Disque optique possedant une epaisseur plane limitee
WO2009075700A1 (fr) * 2007-12-12 2009-06-18 Mohamed Mohab Sabry Disque compact vidéo flexible qui possède un centre bombé et procédé de fabrication de celui-ci
US20100214905A1 (en) * 2009-02-26 2010-08-26 Levinson Eric D Stacking techniques for thin optical data storage media
US8481141B2 (en) 2007-04-30 2013-07-09 Mohamed Mohab Sabry Flexible VCD having domed center and flat central bottom ring and method of making thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2846230A (en) * 1954-04-29 1958-08-05 Rca Corp Phonograph record
US3132866A (en) * 1960-12-01 1964-05-12 Baerle Van Phonograph record

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750336A (en) * 1980-09-05 1982-03-24 Matsushita Electric Ind Co Ltd Information recording carrier
DE4122231C2 (de) * 1991-07-04 1994-06-30 Wacker Chemie Gmbh Verwendung von Vinylchlorid-Vinylester-Mischpolymerisation zur Herstellung von optisch auslesbaren Informationsspeichern
JP2532818B2 (ja) * 1993-02-01 1996-09-11 松下電器産業株式会社 対物レンズおよび光ヘッド装置
JPH07169096A (ja) * 1993-12-15 1995-07-04 Sony Corp 光ディスクおよびその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2846230A (en) * 1954-04-29 1958-08-05 Rca Corp Phonograph record
US3132866A (en) * 1960-12-01 1964-05-12 Baerle Van Phonograph record

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0858657A4 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1291874A2 (fr) * 2001-08-10 2003-03-12 Wea Manufacturing Inc. Procédé et appareil pour réduire la contraction de la région de serrage d'un disque optique, et disque optique obtenu
EP1291874A3 (fr) * 2001-08-10 2003-11-05 Wea Manufacturing Inc. Procédé et appareil pour réduire la contraction de la région de serrage d'un disque optique, et disque optique obtenu
US6865745B2 (en) 2001-08-10 2005-03-08 Wea Manufacturing, Inc. Methods and apparatus for reducing the shrinkage of an optical disc's clamp area and the resulting optical disc
AU2002300442B2 (en) * 2001-08-10 2007-05-10 Wea Manufacturing Inc. Method and Apparatus for Reducing the Shrinkage of an Optical Disc's Clamp Area, and the Resulting Optical Disc
EP1971982A4 (fr) * 2005-03-03 2009-08-19 Enxnet Inc Disque optique possedant une epaisseur plane limitee
EP1971982A2 (fr) * 2005-03-03 2008-09-24 Enxnet, Inc Disque optique possedant une epaisseur plane limitee
EP1921618A4 (fr) * 2005-08-30 2008-12-03 Tropillo Andrei Vladimirovich Support de donnees en forme de disque
EP1921618A1 (fr) * 2005-08-30 2008-05-14 TROPILLO, Andrei Vladimirovich Support de donnees en forme de disque
US8372500B2 (en) 2007-04-30 2013-02-12 Mohamed Mohab Sabry Flexible VCD having domed center and method of making thereof
US8481141B2 (en) 2007-04-30 2013-07-09 Mohamed Mohab Sabry Flexible VCD having domed center and flat central bottom ring and method of making thereof
WO2009075700A1 (fr) * 2007-12-12 2009-06-18 Mohamed Mohab Sabry Disque compact vidéo flexible qui possède un centre bombé et procédé de fabrication de celui-ci
US20100214905A1 (en) * 2009-02-26 2010-08-26 Levinson Eric D Stacking techniques for thin optical data storage media
US8561093B2 (en) * 2009-02-26 2013-10-15 Imation Corp. Stacking techniques for thin optical data storage media

Also Published As

Publication number Publication date
AU4317197A (en) 1998-03-26
EP0858657A1 (fr) 1998-08-19
AU718994B2 (en) 2000-05-04
EP0858657A4 (fr) 2000-07-05
JPH11515131A (ja) 1999-12-21

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