WO2001020605A1 - Procede de production de disques optiques - Google Patents

Procede de production de disques optiques Download PDF

Info

Publication number
WO2001020605A1
WO2001020605A1 PCT/GB2000/003537 GB0003537W WO0120605A1 WO 2001020605 A1 WO2001020605 A1 WO 2001020605A1 GB 0003537 W GB0003537 W GB 0003537W WO 0120605 A1 WO0120605 A1 WO 0120605A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
holographic
photoresist
image
disc
Prior art date
Application number
PCT/GB2000/003537
Other languages
English (en)
Inventor
John David Wiltshire
Ronald Ashley Fisher
Martin John Richardson
Original Assignee
Prosoft Logistics Limited
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
Priority claimed from GBGB9921668.1A external-priority patent/GB9921668D0/en
Priority claimed from GB0001414A external-priority patent/GB0001414D0/en
Priority claimed from GB0004015A external-priority patent/GB0004015D0/en
Application filed by Prosoft Logistics Limited filed Critical Prosoft Logistics Limited
Priority to EP00962664A priority Critical patent/EP1218880A1/fr
Priority to AU74314/00A priority patent/AU7431400A/en
Publication of WO2001020605A1 publication Critical patent/WO2001020605A1/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
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H2001/0055—Adaptation of holography to specific applications in advertising or decorative art
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2270/00—Substrate bearing the hologram
    • G03H2270/20—Shape
    • G03H2270/22—Disc shaped

Definitions

  • This invention concerns improvements in or relating to data carriers and in particular has reference to compact discs and the like, for example, digital versatile discs.
  • Compact discs carry the important data on essentially one side, the other side usually carrying branding, decorative matter and general information regarding the contents of the disc. It has been proposed to create on a face of the compact disc a hologram of a suitable image which will be unique to the disc in question and to its originator, thereby providing a security badge to identify the disc as a genuine product. Products not carrying the relevant image will thus be counterfeit.
  • a hologram One signal advantage of a hologram is the difficulty of copying it and accordingly its use as a security badge is important and will be well known in other fields such as credit and bank cards.
  • various attempts have been made to enable a compact disc to carry a hologram, and indeed there are commercial examples of discs which depict a hologram on their non-data carrying surface.
  • Such holograms are generally of a decorative character and do not readily constitute a security badge.
  • Optical discs have data stored in the form of a spiral track comprising 'pit' areas of reduced effective reflectivity in a surface of 'land' areas which reflect substantially all of the light from the laser in the playing device.
  • the reduced reflectivity of the pits is achieved in one technique by arranging for their depth to coincide with one-quarter of the wavelength of the interrogating laser in the playing device.
  • the bottom of the pit may be perfectly smooth and effectively a plane mirror, light reflected from it will be out-of -phase when compared with light reflected from land areas.
  • One previous method proposed for decorating the surface of CD's with a hologram has avoided placement of the hologram in the data replay areas of the disc in order to prevent data corruption.
  • the hologram area is spatially separated from the data-containing area to avoid cross-talk between the hologram fringes and the data structure. In this way the laser beam in the playing device does not read the areas containing a hologram.
  • This restriction of the available hologram area is inconvenient, and thus forces limitations on the use of holography as a security device or as a promotional novelty.
  • Another earlier proposal involves a method where the hologram fringe structure is contained in a lacquer coated on the reverse, ie non-data, side of the disc after pressing the data into the first side. Such a method is inconvenient from the point of view of both expense and the time taken in producing discs.
  • a holograph of the 'Benton' or 'Rainbow Hologram' image type is recorded as a plane sinusoidal wave structure in the surface of a suitable substrate.
  • the holographic fringes are predominantly linear and relatively simple to define.
  • the fringes recorded in plane grating-type 'holograms' and dot-matrix images are even more orderly and mathematically predictable in their structure.
  • these sinusoidal wave structures are complicated by the fact that they take the form of a compound addition of the amplitude of the individual colour component waves. This complexity of the structure is in fact advantageous in avoiding the creation of surfaces which may tend to be confused by the data reader system as having digital qualities.
  • Holographic image design is of critical importance in this respect such that highlight zones in the holographic image are carefully controlled to avoid their coincidence with the surface of the resist, whereby areas of high level dissolution of resist can inadvertently be created.
  • phase recordings as described here can be manifested in the form of a thickness variation in an embossable lacquer coated onto a carrier layer which is relatively dimensionally stable.
  • the surface of a compact disc (or DND) is an ideal carrier in terms of such dimensional stability.
  • the CD data track is essentially a digital (0/1) stream of information.
  • Cross-talk or interference between the signals can be avoided by virtue of the incompatibility of the sinusoidal holograph with the digital requirements of a reader system.
  • the pit structure of the data track provides a diffraction effect which is potentially destructive towards the optical effectiveness of the hologram, but which, by virtue of its effective fringe spacing can be arranged to be non-deleterious towards the holographic decoration of the disc, since the diffraction may appear at a quite different viewing angle to the holographic image. More difficult, and more important, is to avoid the deletion of the fidelity of the data track by spurious modulations caused by the holographic structure when encountered by the laser beam of the reading device.
  • One object of the present invention is to differentiate between the type of structure capable of carrying a digital optical signal, and the type of structure which can effectively carry a holographic interference recording.
  • a further object of the present invention is to decorate the whole or a part of the active surface of optical discs, namely compact discs or digital versatile discs, with one or more holographic images.
  • a still further object of the present invention is to provide a method of producing in a single step such an optical disc which carries both data and at least one holographic image on its active surface.
  • One aspect of the invention thus provides such a method of production including the step of limiting the total thickness of the holographic structure to a fraction of the depth of the data 'pits' as compared to the 'land' areas of the data recording structure.
  • this fraction is chosen to be of the order of the ordinary production limits of smoothness of the stamping master employed to produce the disc.
  • one method includes the steps of exposing a hologram latent image at a low level of energy into a photoresist layer which is subsequently exposed to high energy exposure of the data-track (1/0) information.
  • Conveniently modified solvent processing is then applied to the layer to obtain a suitable surface profile where the data-pits are cleared to the glass substrate whilst the holographic data are confined to the limited modulation of the land surface.
  • a method involves sequentially coating the photo-resist in two layers, one of which is dyed in such a way as in use during playback to inhibit the transmission of the holographic laser, but to admit the light of the data laser by virtue of its differing wavelength.
  • the invention additionally provides a method for the playback of optical discs using lasers of differing wavelengths to produce the two image components for data and hologram.
  • photoresist layers of differing spectral sensitivity are used to separate the sensitivity of the two layers to the two laser wavelengths.
  • a krypton laser operating at 413 nm. will provide light with exceptional actinic effect on one resist type, whereas the holographic exposure made at 458 nm. with an argon laser may be more active towards a spectrally sensitized resist only.
  • An alternative method includes the step of re-coating the solvent-processed imaged data resist with a second thin coating to receive the holographic image.
  • an aerosol method of coating may be used with the disc inverted relative to the ordinary coating regime.
  • Dilution of photoresist solution with abnormal quantities of solvent for use in high speed spin-coating equipment enables exceptionally thin layers to be successfully produced down to an almost infinitesimal limit of a few nanometres of thickness.
  • Shipley 1800 photoresist is an example of a resist capable of producing such structures, and other products with more suitable gamma characteristics may in the future provide tolerance to ease the criticality of the processing of the master recording.
  • Photoresist coatings may be typically coated on circular glass substrate discs.
  • the use of a red iron oxide surface coating or other absorbent barrier layer to this glass can be used to eliminate unsatisfactory effects of internal reflection of the laser light within the substrate glass to improve the fidelity of both the hologram and the data recordings.
  • These coated discs are sequentially imaged with data track and then moved in light-safe containers to a holographic imaging table system for imaging with holographic fringes or vice-versa, dependent upon which of the alternative dual layer imaging techniques above is to be used.
  • Transmission holograms of the 2D/3D and Stereogram types are examples of the type of imaging which can be transferred into the resist from such a table system.
  • Digitised dot-matrix systems for holographic imaging can also be used , and direct imaging of plane gratings through masks may be an alternative decoration technique.
  • the holographic information may also be placed onto the unexposed photo resist by means of micro embossing from a separate pre-recorded medium such as a metal shim.
  • a separate pre-recorded medium such as a metal shim.
  • This metal shim will carry the holographic pattern which on contact with the unexposed photo resist will be impregnated into the resist under a predetermined pressure, leaving behind the impression of a holographic image without causing any detriment to the unexposed photo resist layer.
  • the resist is then ready for digital encoding without interference from the holographic information.
  • the black silver can selectively and accurately protect the underlying photoresist areas from exposure to the holographic image or images which will cover other parts of the disc.
  • Formulations for a suitable fine-grain silver halide gelatin emulsion have been published by Bjelkhagen in his book 'Silver Halide Recording Materials for Holography and their Processing' Springer Series in Optical Science. After imaging the hologram information, the silver halide mask can be washed entirely away from the photoresist before it is returned in darkness to be machine processed in a routine way.
  • a principal advantage of the present invention is that its methods rely on being able to generate optically readable discs in a single production step whereby the disc carries both data and a holographic image on the active surface in the absence of any compromise in the integrity of the data thereby enabling both the data and the image to co-exist.
  • the high cost of double handling techniques currently proposed in the art is thus avoided, the only additional cost of manufacture residing in the preparation of the purpose-modified metal master stamper for the discs, thus representing a significant saving in production time and expense.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Holo Graphy (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

L'invention concerne un procédé de production de disques optiques consistant à appliquer une image holographique sur une surface porteuse de données, au moyen d'une photorésine sur laquelle l'image est fixée sans compromettre l'intégrité de la voie porteuse de données.
PCT/GB2000/003537 1999-09-15 2000-09-14 Procede de production de disques optiques WO2001020605A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00962664A EP1218880A1 (fr) 1999-09-15 2000-09-14 Procede de production de disques optiques
AU74314/00A AU7431400A (en) 1999-09-15 2000-09-14 Method of producing optical discs

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GBGB9921668.1A GB9921668D0 (en) 1999-09-15 1999-09-15 Improvements in or relating to data carriers
GB9921668.1 1999-09-15
GB0001414.2 2000-01-22
GB0001414A GB0001414D0 (en) 2000-01-22 2000-01-22 Improvements in or relating to data carriers
GB0004015A GB0004015D0 (en) 2000-02-22 2000-02-22 Improvements in or telating to data carriers
GB0004015.4 2000-02-22

Publications (1)

Publication Number Publication Date
WO2001020605A1 true WO2001020605A1 (fr) 2001-03-22

Family

ID=27255486

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/003537 WO2001020605A1 (fr) 1999-09-15 2000-09-14 Procede de production de disques optiques

Country Status (3)

Country Link
EP (1) EP1218880A1 (fr)
AU (1) AU7431400A (fr)
WO (1) WO2001020605A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004095447A1 (fr) * 2003-04-16 2004-11-04 Holographic Image Studio Ltd Support de donnees optiques

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3578451A (en) * 1967-03-29 1971-05-11 Scott Paper Co Integral negative type positive photolithographic plate
GB2058379A (en) * 1979-09-12 1981-04-08 Agfa Gevaert Imaging Process
US4837130A (en) * 1986-08-27 1989-06-06 Pioneer Electronic Corp. Optical disk manufacturing method
EP0374256A1 (fr) * 1988-04-12 1990-06-27 Dai Nippon Insatsu Kabushiki Kaisha Support d'enregistrement optique et procede de fabrication
WO1993008565A1 (fr) * 1991-10-19 1993-04-29 Applied Holographics Plc Disque optique de stockage de donnees
WO1994008443A1 (fr) * 1992-09-29 1994-04-14 Berg N Edward Procede et dispositif de fabrication de plaquettes de circuits imprimes
EP0596439A2 (fr) * 1992-11-05 1994-05-11 Matsushita Electric Industrial Co., Ltd. Procédé de fabrication d'un disque-mère utilisable pour la production de disques optiques
FR2702077A1 (fr) * 1993-02-22 1994-09-02 Digipress Sa Procédé de fabrication d'un disque maître et d'une matrice de pressage de disques optiques perfectionnés, disque optique obtenu à partir de ce disque maître ou de cette matrice de pressage.
WO1996000446A1 (fr) * 1994-06-24 1996-01-04 Minnesota Mining And Manufacturing Company Marquage de disque optique assurant l'identification personnalisee
EP0708439A1 (fr) * 1994-10-21 1996-04-24 Nec Corporation Disque maître pour un disque optique et procédé de fabrication de disque maître

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3578451A (en) * 1967-03-29 1971-05-11 Scott Paper Co Integral negative type positive photolithographic plate
GB2058379A (en) * 1979-09-12 1981-04-08 Agfa Gevaert Imaging Process
US4837130A (en) * 1986-08-27 1989-06-06 Pioneer Electronic Corp. Optical disk manufacturing method
EP0374256A1 (fr) * 1988-04-12 1990-06-27 Dai Nippon Insatsu Kabushiki Kaisha Support d'enregistrement optique et procede de fabrication
WO1993008565A1 (fr) * 1991-10-19 1993-04-29 Applied Holographics Plc Disque optique de stockage de donnees
WO1994008443A1 (fr) * 1992-09-29 1994-04-14 Berg N Edward Procede et dispositif de fabrication de plaquettes de circuits imprimes
EP0596439A2 (fr) * 1992-11-05 1994-05-11 Matsushita Electric Industrial Co., Ltd. Procédé de fabrication d'un disque-mère utilisable pour la production de disques optiques
FR2702077A1 (fr) * 1993-02-22 1994-09-02 Digipress Sa Procédé de fabrication d'un disque maître et d'une matrice de pressage de disques optiques perfectionnés, disque optique obtenu à partir de ce disque maître ou de cette matrice de pressage.
WO1996000446A1 (fr) * 1994-06-24 1996-01-04 Minnesota Mining And Manufacturing Company Marquage de disque optique assurant l'identification personnalisee
EP0708439A1 (fr) * 1994-10-21 1996-04-24 Nec Corporation Disque maître pour un disque optique et procédé de fabrication de disque maître

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004095447A1 (fr) * 2003-04-16 2004-11-04 Holographic Image Studio Ltd Support de donnees optiques

Also Published As

Publication number Publication date
AU7431400A (en) 2001-04-17
EP1218880A1 (fr) 2002-07-03

Similar Documents

Publication Publication Date Title
US5085514A (en) Technique of forming a separate information bearing printed pattern on replicas of a hologram or other surface relief diffraction pattern
US5607188A (en) Marking of optical disc for customized identification
US5452282A (en) Optical data storage disc
CA1286132C (fr) Dispositifs de securite a diffraction difficiles a dupliquer exactement
TW301718B (en) Phase correlation multiplex holography
US5083850A (en) Technique of forming a separate information bearing printed pattern on replicas of a hologram or other surface relief diffraction pattern
US20060002274A1 (en) Hologram duplication method
EP0865040A2 (fr) Procédés de réalisation de graphiques génériques et spécifiques sur des disques d'information en matière plastique
WO2004095447A1 (fr) Support de donnees optiques
JPS61176968A (ja) 多重記録体
JP4076240B2 (ja) 複合ホログラム
JP3365645B2 (ja) ホログラム、該ホログラムの作成方法およびホログラムを用いた確認方法
EP1218880A1 (fr) Procede de production de disques optiques
WO2006077447A2 (fr) Support d'enregistrement holographique
JP3711806B2 (ja) 商品の真贋判定方法
US6011767A (en) Optical data storage disc with a visible holographic image and method for its manufacture
US20030133401A1 (en) Optical storage medium
US20110069596A1 (en) Holographic recording method, a holographic recording medium and use of such medium
JP3483209B2 (ja) ホログラムフィルム及びその製造方法
JPH1153767A (ja) 光データ記録ディスクおよびその製造方法
JP3307994B2 (ja) ホログラム真偽確認方法および確認装置
CA2206364A1 (fr) Procede de fabrication de disques maitres de production de matrices de pressage de disques optiques portant une marque, particulierement du type antipiratage, et disque maitre, matrice de pressage et disque optique obtenus avec cette methode
JPH06301324A (ja) 機械読み取り情報入りホログラムとそれを備えた物品およびその作成方法ならびに情報読取方法
JPH10123920A (ja) 複製防止ホログラム
JPH1097169A (ja) 複製防止ホログラム

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 2000962664

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 2000962664

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Ref document number: 2000962664

Country of ref document: EP

DPE2 Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101)