WO1999004395A1 - Creation d'images graphiques sur un disque optique - Google Patents

Creation d'images graphiques sur un disque optique Download PDF

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Publication number
WO1999004395A1
WO1999004395A1 PCT/GB1997/003516 GB9703516W WO9904395A1 WO 1999004395 A1 WO1999004395 A1 WO 1999004395A1 GB 9703516 W GB9703516 W GB 9703516W WO 9904395 A1 WO9904395 A1 WO 9904395A1
Authority
WO
WIPO (PCT)
Prior art keywords
master
exposure
optical disc
information area
graphic
Prior art date
Application number
PCT/GB1997/003516
Other languages
English (en)
Inventor
Kai Leung Fan
Original Assignee
Harmonic Hall Optical Disc Ltd.
Prentice, Raymond, Roy
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 Harmonic Hall Optical Disc Ltd., Prentice, Raymond, Roy filed Critical Harmonic Hall Optical Disc Ltd.
Priority to AU53310/98A priority Critical patent/AU5331098A/en
Publication of WO1999004395A1 publication Critical patent/WO1999004395A1/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
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/261—Preparing a master, e.g. exposing photoresist, electroforming
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
    • G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
    • 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

Definitions

  • This invention relates to improvements in optical discs and is particularly concerned with a method for creating graphic images on the information area of a compact disc, a DVD disc or a laser disc.
  • An optical disc is a media which uses pits in which the depth is equal to a quarter of the wavelength of a readout laser for information storage.
  • a photoresist coated glass is used for making stampers.
  • the data to be recorded is transformed by the mathematical method (Cross Interleave Reed Solomon Coding) and then further converted to EFM signal for switching on and off the exposure laser.
  • EFM signal for switching on and off the exposure laser.
  • small information pits will be created on the surface of the photoresist glass master.
  • a stamper is finished.
  • the information pits on a stamper are transferred to a PC substrate by means of injection moulding. After that, the disc is coated with a thin reflective layer and a layer for reflective layer protection. After the top printing, a compact disc is finished.
  • the information area of an optical disc is divided into a lead-in area, a program area and a lead out area.
  • the pit length inside the information area varies according to the data stream of the compact disc.
  • the pit height of a CD is in principle equal to a quarter of the wavelength of the readout laser in the PC substrate or PMMA substrate.
  • Fig. 1 of the drawings The steps involved in a standard process for optical disc production are illustrated schematically in Fig. 1 of the drawings.
  • graphics are created on the read-out side of the optical disc.
  • the graphic image can only be created outside the information area.
  • Such method uses the principle of recording in which some specific graphic patterns are represented by the combination of different length pits.
  • Such kind of graphics usually find application in identification.
  • the pit depth in such a case is equal to the photoresist thickness.
  • the catalog number at the inner radius of the optical disc is created in this way.
  • such a method is very difficult to find application in creating graphic patterns inside the information area and strong laser exposure will damage the original information pits to cause data error.
  • the area of an optical disc which can carry printed graphic patterns is either severely restricted or, alternatively, the information area of an optical disc is severely restricted in order to accommodate a large printed area.
  • the present invention aims to provide an improvement over the known optical discs and in the known methods of making such discs.
  • the present invention proposes a method for creating graphics on top of the pits in an optical disc without deteriorating the information pits to cause data error during read out.
  • the present invention provides a method of making an optical disc comprising the steps of exposing a photoresist glass master to a laser beam for recording data on an information area of the master, subjecting the master to a second graphic exposure and subsequently developing, metallizing and electroforming the master to form a stamper which can be used to produce optical discs by injection moulding, wherein the areas of the master which are subjected to the second exposure are located both within and outside the information area and are so arranged that the exposed areas within the information area do not interfere with or cause data error during playing of an optical disc produced from the master.
  • the method for creating graphics on an optical disc according to the invention is based on a second exposure on a recorded glass master before developing.
  • the graphic pattern is transferred to the glass master by normal photographic enlargement method.
  • a film is inserted into an enlargement exposure unit.
  • the time and intensity of exposure it is possible to control the etching depth of the pits.
  • the glass master is developed and then follow the other procedures in making stampers.
  • the etching depth of the graphic pattern is controlled to less than 1/10 of the normal pit so as not to cause signal deterioration. Over-exposure of the graphic pattern will cause the loss of pits in the second exposed area and hence cause decoding error.
  • the graphic pattern will appear as a grey image on the stamper and will be transferred to replica discs by injection moulding.
  • Fig. 3 is a vertical section through a conventional stamper
  • Fig. 4 is a vertical section through a stamper produced by the method according to the present invention.
  • the standard depth of pits 1, 2, 3 etched by a laser beam is approximately 1600nm.
  • the pits 1 and 3 have been exposed to the second graphic exposure which has transferred a graphic image of approximately 150nm so that the depth of these pits is only approximately 1450nm. However, this depth is still sufficient to enable a disc to be read without distortion or corruption of the data read out.
  • the different depth pits in Fig. 4 show a different reflection to light due to different interference patterns. After replication, the pit pattern will be transferred to the replica but the pit height will be reduced by 10 to 15% due to replication loss of injection moulding.
  • the pit depth of the stamper is controlled by the photoresist thickness which usually varies in the range of 120nm to 180nm depending on the preference of the process engineer.
  • the method according to the invention can be used for creating a logo, graphics or any special signs inside the information area.
  • the whole CD surface can be used for graphics. It is also a good way to distinguish between pirate copies and the original because it is very difficult to duplicate the graphic patterns on the CD.
  • the invention also extends to masters, produced by the method according to the invention and to optical discs produced from such masters.

Landscapes

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

Abstract

L'invention concerne un procédé de fabrication amélioré d'un disque optique. Ce procédé consiste: à exposer un disque de verre recouvert d'une couche de photorésist à un faisceau laser, afin d'enregistrer des données sur une zone d'informations de ce disque de verre; à soumettre ce disque de verre à une seconde exposition graphique; et enfin à développer, à métalliser, et à reproduire par galvanoplastie ce disque de verre, afin de former une matrice pouvant être utilisée pour produire des disques optiques par moulage par injection. Les zones du disque de verre soumises à une exposition graphique, situées à la fois à l'intérieur et à l'extérieur de ladite zone d'informations, sont disposées de manière à ne pas provoquer d'erreurs dans les données pendant la lecture d'un disque optique produit à partir du disque de verre susmentionné. Ainsi, la totalité de la zone de lecture d'un disque optique peut être recouverte d'informations imprimées ou d'informations graphiques.
PCT/GB1997/003516 1997-07-15 1997-12-19 Creation d'images graphiques sur un disque optique WO1999004395A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU53310/98A AU5331098A (en) 1997-07-15 1997-12-19 Creation of graphic images on a data disc

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9714887.8 1997-07-15
GBGB9714887.8A GB9714887D0 (en) 1997-07-15 1997-07-15 Improvements in optical discs

Publications (1)

Publication Number Publication Date
WO1999004395A1 true WO1999004395A1 (fr) 1999-01-28

Family

ID=10815885

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/003516 WO1999004395A1 (fr) 1997-07-15 1997-12-19 Creation d'images graphiques sur un disque optique

Country Status (3)

Country Link
AU (1) AU5331098A (fr)
GB (1) GB9714887D0 (fr)
WO (1) WO1999004395A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6423478B1 (en) * 2000-04-05 2002-07-23 Eastman Kodak Company Method of forming a watermark image in a hybrid optical master disc
EP1852867A2 (fr) 2006-05-05 2007-11-07 Moser Baer India Ltd. Procédé d'impression sur un disque

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992022894A1 (fr) * 1991-06-13 1992-12-23 Applied Holographics Plc Disque optique de stockage de donnees
US5398231A (en) * 1990-11-17 1995-03-14 Taiyo Yuden Co., Ltd. Optical information recording substrate and method of making thereof
JPH0855370A (ja) * 1994-08-11 1996-02-27 Nippon Columbia Co Ltd 光ディスク製造方法とスタンパーと金型及び光ディスク
JPH08287526A (ja) * 1995-04-19 1996-11-01 Pioneer Video Corp 光ディスク原盤製造方法
US5607188A (en) * 1994-06-24 1997-03-04 Imation Corp. Marking of optical disc for customized identification
EP0818782A2 (fr) * 1996-07-11 1998-01-14 Wea Manufacturing Inc. Procédé de réalisation de graphiques sur des disques d'information en matière plastique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5398231A (en) * 1990-11-17 1995-03-14 Taiyo Yuden Co., Ltd. Optical information recording substrate and method of making thereof
US5498509A (en) * 1990-11-17 1996-03-12 Taiyo Yuden Co., Ltd. Method of making an optical information recording substrate
WO1992022894A1 (fr) * 1991-06-13 1992-12-23 Applied Holographics Plc Disque optique de stockage de donnees
US5607188A (en) * 1994-06-24 1997-03-04 Imation Corp. Marking of optical disc for customized identification
JPH0855370A (ja) * 1994-08-11 1996-02-27 Nippon Columbia Co Ltd 光ディスク製造方法とスタンパーと金型及び光ディスク
JPH08287526A (ja) * 1995-04-19 1996-11-01 Pioneer Video Corp 光ディスク原盤製造方法
EP0818782A2 (fr) * 1996-07-11 1998-01-14 Wea Manufacturing Inc. Procédé de réalisation de graphiques sur des disques d'information en matière plastique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 096, no. 006 28 June 1996 (1996-06-28) *
PATENT ABSTRACTS OF JAPAN vol. 097, no. 003 31 March 1997 (1997-03-31) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6423478B1 (en) * 2000-04-05 2002-07-23 Eastman Kodak Company Method of forming a watermark image in a hybrid optical master disc
EP1852867A2 (fr) 2006-05-05 2007-11-07 Moser Baer India Ltd. Procédé d'impression sur un disque
EP1852867A3 (fr) * 2006-05-05 2008-09-17 Moser Baer India Ltd. Procédé d'impression sur un disque
EP2216786A1 (fr) * 2006-05-05 2010-08-11 Moser Baer India Ltd. Disque optique à double couche et sa procédé de fabrication

Also Published As

Publication number Publication date
GB9714887D0 (en) 1997-09-17
AU5331098A (en) 1999-02-10

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