EP0858657A1 - Disques optiques a tres haute densite a une face - Google Patents

Disques optiques a tres haute densite a une face

Info

Publication number
EP0858657A1
EP0858657A1 EP97941171A EP97941171A EP0858657A1 EP 0858657 A1 EP0858657 A1 EP 0858657A1 EP 97941171 A EP97941171 A EP 97941171A EP 97941171 A EP97941171 A EP 97941171A EP 0858657 A1 EP0858657 A1 EP 0858657A1
Authority
EP
European Patent Office
Prior art keywords
region
thickness
disc
discs
super
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP97941171A
Other languages
German (de)
English (en)
Other versions
EP0858657A4 (fr
Inventor
William Mueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wea Manufacturing Inc
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
Publication of EP0858657A1 publication Critical patent/EP0858657A1/fr
Publication of EP0858657A4 publication Critical patent/EP0858657A4/fr
Withdrawn legal-status Critical Current

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)

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.
EP97941171A 1996-09-05 1997-09-05 Disques optiques a tres haute densite a une face Withdrawn EP0858657A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US70888696A 1996-09-05 1996-09-05
US708886 1996-09-05
PCT/IB1997/001237 WO1998010418A1 (fr) 1996-09-05 1997-09-05 Disques optiques a tres haute densite a une face

Publications (2)

Publication Number Publication Date
EP0858657A1 true EP0858657A1 (fr) 1998-08-19
EP0858657A4 EP0858657A4 (fr) 2000-07-05

Family

ID=24847563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97941171A Withdrawn EP0858657A4 (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)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP1971982A4 (fr) * 2005-03-03 2009-08-19 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
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
US8372500B2 (en) * 2007-04-30 2013-02-12 Mohamed Mohab Sabry Flexible VCD having domed center and method of making thereof
US8561093B2 (en) * 2009-02-26 2013-10-15 Imation Corp. Stacking techniques for thin optical data storage media

Family Cites Families (6)

* 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
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

Also Published As

Publication number Publication date
WO1998010418A1 (fr) 1998-03-12
EP0858657A4 (fr) 2000-07-05
AU4317197A (en) 1998-03-26
JPH11515131A (ja) 1999-12-21
AU718994B2 (en) 2000-05-04

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