EP1252624A1 - Optical storage medium - Google Patents

Optical storage medium

Info

Publication number
EP1252624A1
EP1252624A1 EP00981376A EP00981376A EP1252624A1 EP 1252624 A1 EP1252624 A1 EP 1252624A1 EP 00981376 A EP00981376 A EP 00981376A EP 00981376 A EP00981376 A EP 00981376A EP 1252624 A1 EP1252624 A1 EP 1252624A1
Authority
EP
European Patent Office
Prior art keywords
hologram
storage medium
optical storage
recording area
pits
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Withdrawn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
EP00981376A
Other languages
German (de)
French (fr)
Inventor
Günther Dausmann
Irina Menz
Zishao Yang
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.)
HSM Holographic Systems Muenchen GmbH
HSM GmbH and Co KG
Original Assignee
HSM Holographic Systems Muenchen GmbH
HSM GmbH and Co KG
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 HSM Holographic Systems Muenchen GmbH, HSM GmbH and Co KG filed Critical HSM Holographic Systems Muenchen GmbH
Publication of EP1252624A1 publication Critical patent/EP1252624A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
    • G11B23/281—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs by changing the physical properties of the record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00876—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy wherein physical copy protection means are attached to the medium, e.g. holograms, sensors, or additional semiconductor circuitry
    • 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
    • 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
    • G03H2270/00—Substrate bearing the hologram
    • G03H2270/20—Shape
    • G03H2270/22—Disc shaped
    • 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

  • the invention relates to an optical storage medium, preferably CD or DVD, with a spiral track consisting of successive depressions (pits), on which a hologram is superimposed in the recording area.
  • CD in particular are objects of product piracy and the high counterfeiting rate of CD causes considerable losses for manufacturers because of the counterfeit products and in particular also because of the quality defects of these counterfeit products.
  • holograms forming seals of authenticity are usually applied to the back of the CD or to the annular edge strips or to the inner area between which the recording area is located.
  • These authenticity-forming holograms not only have to be specially produced, but also have to be applied with additional manufacturing steps, and they can also be easily produced by counterfeiters and applied to imitated CDs.
  • Such protection against counterfeiting can be achieved in that the hologram is introduced into the recording area of the CD in such a way that the quality of the stored signals does not suffer when it is read out.
  • a CD or a DVD is known, in the recesses (pits) of which a hologram is introduced. Since the hologram is only stored in the pits, it consists of pixels dependent on the length of the pits, so that the recognizability of the reconstructed hologram is impaired.
  • the object of the invention is to provide an optical storage medium of the type specified at the outset which, by superimposing a hologram in its recording area, offers great security against counterfeiting, the hologram being distinguished by good recognition when it is reconstructed.
  • this object is achieved in that at least one hologram in at least one of the information carriers, e.g. into which the recesses (pits), enclosing surface area of the recording area, is introduced.
  • the information carrier e.g. pits, enclosing surface area is larger than the area occupied by the information carriers, can be inserted into a CD, for example, easily recognizable holograms.
  • the holograms forming an authenticity feature are generated in the CD master, so that the CD can be molded by injection molding or embossing by mass production.
  • the production of the CD master with the hologram incorporated in the tool requires special knowledge of the manufacturer that will not be readily available to a counterfeiter.
  • the authenticity features according to the invention in the form of holograms can be implemented not only on CD and DVD, but also on all other optical storage media in a corresponding or analogous manner.
  • the ratio of the depths of the holographic phase structure to the depths of the depressions (pits) is 1: 5 to 1:10 and preferably 1: 6. It should be taken into account here that a diffraction efficiency of about 10% is achieved, for example, with a structure depth of the holograms of 20 nm. Holograms with diffraction efficiencies of around 2% are already clearly visible to the human eye.
  • holographic structure depths of approximately 10 nm are preferred.
  • the hologram contains machine-readable features.
  • the CD master containing a hologram for producing the optical storage media according to the invention can be produced, for example, by exposing a hologram with a reversed image to a plate coated with a photoresist using laser light. Different exposure techniques such as 2D or 3D technology, dot matrix technology or holomax technology can be used.
  • the photoresist is then developed with an alkaline developer so that a holographic surface relief is formed in the photoresist with a preferred depth of 500 nm, for example.
  • the surface is then silvered and then a nickel-electroplated impression is taken.
  • the holographic image then appears with the correct orientation in the nickel matrix obtained and is raised above the nickel matrix.
  • the nickel die then serves as an emboss die for a CD master made of photoresist.
  • the CD information in the form of "pits and lands" is then generated in the surface of this photoresist in the usual photolithographic manner.
  • the nickel die is embossed with a certain pressure into the raised CD information-carrying structures of the CD resist master, and only to a depth of 10 to 20 nm conductive material is vapor-deposited and galvanically molded in nickel. In this way, a nickel die is produced, which is used for the mass production of CD in the plastic injection molding process.
  • the Structured side of the CD is steamed with aluminum and then a protective lacquer is applied which forms the back.
  • the CD side to be read usually consists of transparent polycarbonate.
  • a CD master for the production of hologram-secured CDs can also be produced, for example, by embossing the hologram into the as yet unexposed photoresist and then exposing the photoresist with the CD information in a conventional manner and processing it further, or by exposing the photoresist twice , once with the hologram and then with the pit pattern to be generated, whereupon the usual further processing takes place until the CD master suitable for casting is completed.
  • the hologram representing a security feature can be introduced into the raised surface of the recording area, which consists of the "lands" between the depressions (pits) and the distances between the tracks, which is usually 1.6 ⁇ m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Holo Graphy (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

The invention relates to an optical storage medium, preferably a CD or a DVD, with a spiral-shaped track consisting of a successive pits, in which a hologram is superimposed in the recording area. The aim of the invention is to use the superimposed hologram to provide substantial protection against counterfeiting while ensuring that the hologram essentially remains easily recognisable when reconstructed. To this end, the hologram is introduced into at least one information support, for example the surface of the recording area that surrounds the pit.

Description

Optisches Speichermedium Optical storage medium
Die Erfindung betrifft ein optisches Speichermedium, vorzugsweise CD oder DVD mit einer aus aufeinanderfolgenden Vertiefungen (pits) bestehenden spiraligen Spur, dem in dem Aufzeichnungsbereich ein Hologramm überlagert ist.The invention relates to an optical storage medium, preferably CD or DVD, with a spiral track consisting of successive depressions (pits), on which a hologram is superimposed in the recording area.
Besonders CD sind Objekte der Produktpiraterie und die hohe Fälschungsrate von CD verursacht bei den Herstellern erhebliche Verluste wegen der gefälschten Produkte und insbesondere auch wegen der Qualitätsmängel dieser gefälschten Produkte. Um CD vor Nachahmungen zu schützen, werden üblicherweise Echtheitssiegel bildende Hologramme auf die Rückseite der CD oder den ringförmigen Randstreifen oder den inneren Bereich, zwischen denen sich der Aufzeichnungsbereich befindet, aufgebracht. Diese Echtheitsmerkmale bildenden Hologramme müssen nicht nur besonders hergestellt, sondern auch mit zusätzlichen Herstellungsschritten aufgebracht werden und sie lassen sich auch problemlos von Fälschern herstellen und auf nachgeahmte CD aufbringen. Es besteht daher ein Bedürfnis, Echtheitsmerkmale bildende Hologramme in einer Weise mit CD zu verbinden, daß sich diese in einfacherer Weise herstellen lassen und darüberhinaus einen großen Schutz gegen Nachahmung schaffen. Ein derartiger Schutz gegen Fälschung läßt sich dadurch erreichen, daß das Hologramm in einer Weise in den Aufzeichnungsbereich der CD eingebracht wird, daß dadurch die Qualität der gespeicherten Signale beim Auslesen nicht leidet.CD in particular are objects of product piracy and the high counterfeiting rate of CD causes considerable losses for manufacturers because of the counterfeit products and in particular also because of the quality defects of these counterfeit products. In order to protect CD from imitations, holograms forming seals of authenticity are usually applied to the back of the CD or to the annular edge strips or to the inner area between which the recording area is located. These authenticity-forming holograms not only have to be specially produced, but also have to be applied with additional manufacturing steps, and they can also be easily produced by counterfeiters and applied to imitated CDs. There is therefore a need to combine authenticity-forming holograms with CD in such a way that they can be produced in a simpler manner and moreover provide great protection against imitation. Such protection against counterfeiting can be achieved in that the hologram is introduced into the recording area of the CD in such a way that the quality of the stored signals does not suffer when it is read out.
Aus WO 99/13466 ist eine CD oder eine DVD bekannt, in deren Vertiefungen (pits) ein Hologramm eingebracht ist. Da das Hologramm nur in den pits gespeichert ist, besteht dieses aus von der Länge der pits abhängigen Pixel, so daß die Erkennbarkeit des rekonstruierten Hologramms beeinträchtigt ist.From WO 99/13466 a CD or a DVD is known, in the recesses (pits) of which a hologram is introduced. Since the hologram is only stored in the pits, it consists of pixels dependent on the length of the pits, so that the recognizability of the reconstructed hologram is impaired.
Aufgabe der Erfindung ist es, ein optisches Speichermedium der eingangs angegebenen Art zu schaffen, das durch Überlagerung mit einem Hologramm in seinem Aufzeichnungsbereich eine große Sicherheit gegen Fälschungen bietet, wobei sich das Hologramm bei seiner Rekonstruktion durch gute Erkennbarkeit auszeichnet.The object of the invention is to provide an optical storage medium of the type specified at the outset which, by superimposing a hologram in its recording area, offers great security against counterfeiting, the hologram being distinguished by good recognition when it is reconstructed.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß mindestens ein Hologramm in mindestens einen die Informationsträger, z.B. in den die Vertiefungen (pits), einfassenden Oberflächenbereich des Aufzeichnungsbereichs, eingebracht ist.According to the invention, this object is achieved in that at least one hologram in at least one of the information carriers, e.g. into which the recesses (pits), enclosing surface area of the recording area, is introduced.
Da der die Informationsträger, z.B. pits, einfassende Oberflächenbereich größer ist als der von den Informationsträgern eingenommene Bereich, lassen sich beispielsweise in eine CD gut erkennbare Hologramme einbringen. Die ein Echtheitsmerkmal bildenden Hologramme werden in dem CD-Master erzeugt, so daß sich die CD von diesem im Wege der Massenproduktion spritzgußtechnisch oder auch prägetechnisch abformen lassen. Die Herstellung des CD-Masters mit dem in dem Werkzeug eingebrachten Hologramm erfordert Spezialkenntnisse des Herstellers, die einem Fälscher nicht ohne weiteres zur Verfügung stehen werden.Since the information carrier, e.g. pits, enclosing surface area is larger than the area occupied by the information carriers, can be inserted into a CD, for example, easily recognizable holograms. The holograms forming an authenticity feature are generated in the CD master, so that the CD can be molded by injection molding or embossing by mass production. The production of the CD master with the hologram incorporated in the tool requires special knowledge of the manufacturer that will not be readily available to a counterfeiter.
Die erfindungsgemäßen Echtheitsmerkmale in Form von Hologrammen können nicht nur bei CD und DVD, sondern auch bei allen anderen optischen Speichermedien in entsprechender oder analoger Weise verwirklicht werden. Nach einer bevorzugten Ausführuήgsform ist vorgesehen, daß das Verhältnis der Tiefen der holografischen Phasenstruktur zu den Tiefen der Vertiefungen (pits) 1 :5 bis 1 :10 und vorzugsweise 1 :6 beträgt. Hierbei ist zu berücksichtigen, daß beispielsweise bei einer Strukturtiefe der Hologramme von 20 nm ein Beugungswirkungsgrad von etwa 10% erreicht wird. Für das menschliche Auge sind bereits Hologramme mit Beugungswirkungsgraden von etwa 2% gut sichtbar. Für die erfindungsgemäß einzubringenden Hologramme werden bevorzugt holografische Strukturtiefen von etwa 10 nm bevorzugt.The authenticity features according to the invention in the form of holograms can be implemented not only on CD and DVD, but also on all other optical storage media in a corresponding or analogous manner. According to a preferred embodiment it is provided that the ratio of the depths of the holographic phase structure to the depths of the depressions (pits) is 1: 5 to 1:10 and preferably 1: 6. It should be taken into account here that a diffraction efficiency of about 10% is achieved, for example, with a structure depth of the holograms of 20 nm. Holograms with diffraction efficiencies of around 2% are already clearly visible to the human eye. For the holograms to be introduced according to the invention, holographic structure depths of approximately 10 nm are preferred.
Nach einer weiteren bevorzugten Ausführungsform ist vorgesehen, daß das Hologramm maschinenlesbare Merkmale enthält.According to a further preferred embodiment it is provided that the hologram contains machine-readable features.
Der ein Hologramm enthaltende CD-Master zur Herstellung der erfindungsgemäßen optischen Speichermedien kann beispielsweise dadurch hergestellt werden, daß in eine mit einem Fotoresist beschichtete Platte mit Laserlicht ein Hologramm mit seitenverkehrtem Bild einbelichtet wird. Dabei können unterschiedliche Belichtungstechniken wie beispielsweise 2D- oder 3D-Technik, dot-Matrix-Technik oder Holomaxtechnik verwendet werden. Der Fotoresist wird sodann mit einem alkalischen Entwickler entwickelt, so daß ein holografisches Oberflächenrelief in dem Fotoresist mit einer bevorzugten Tiefe von beispielsweise 500 nm entsteht. Die Oberfläche wird sodann versilbert und anschließend wird eine nickelgarvanische Abformung vorgenommen. Das holografische Bild erscheint sodann in der erhaltenen Nickelmatritze seitenrichtig und ist über der Nickelmatritze erhaben. Die Nik- kelmatritze dient sodann als Prägematritze für einen CD-Master aus Fotoresist. In der Oberfläche dieses Fotoresist werden sodann auf üblichem fotolitografischem Wege die CD-Informationen in Form von "pits und lands" erzeugt. Die Nickelmatritze wird mit einem bestimmten Druck in die erhabenen CD-informationstragenden Strukturen des CD-Resistmasters geprägt, und zwar nur bis zu einer Tiefe von 10 bis 20 nm. Der auf diese Weise hergestellte CD-Master aus Fotoresist wird sodann in üblicher Weise mit einem leitfähigen Material bedampft und galvanisch in Nickel abgeformt. Auf diese Weise wird eine Nickelmatritze hergestellt, die zur massenweise Herstellung von CD im Kunststoffspritzgußverfahren verwendet wird. Die strukturierte Seite der CD wird mit Aluminium bedampft und sodann wird ein die Rückseite bildender Schutzlack aufgebracht. Die auszulesende CD-Seite besteht üblicherweise aus transparentem Polykarbonat.The CD master containing a hologram for producing the optical storage media according to the invention can be produced, for example, by exposing a hologram with a reversed image to a plate coated with a photoresist using laser light. Different exposure techniques such as 2D or 3D technology, dot matrix technology or holomax technology can be used. The photoresist is then developed with an alkaline developer so that a holographic surface relief is formed in the photoresist with a preferred depth of 500 nm, for example. The surface is then silvered and then a nickel-electroplated impression is taken. The holographic image then appears with the correct orientation in the nickel matrix obtained and is raised above the nickel matrix. The nickel die then serves as an emboss die for a CD master made of photoresist. The CD information in the form of "pits and lands" is then generated in the surface of this photoresist in the usual photolithographic manner. The nickel die is embossed with a certain pressure into the raised CD information-carrying structures of the CD resist master, and only to a depth of 10 to 20 nm conductive material is vapor-deposited and galvanically molded in nickel. In this way, a nickel die is produced, which is used for the mass production of CD in the plastic injection molding process. The Structured side of the CD is steamed with aluminum and then a protective lacquer is applied which forms the back. The CD side to be read usually consists of transparent polycarbonate.
Ein CD-Master zur Herstellung von Hologramme gesicherten CD kann beispielsweise auch dadurch hergestellt werden, daß das Hologramm in den noch nicht belichteten Fotoresist eingeprägt und anschließend der Fotoresist in üblicher Weise mit der CD-Information belichtet und weiterbearbeitet wird oder daß der Fotoresist zweimal belichtet wird, und zwar einmal mit dem Hologramm und anschließend mit dem zu erzeugenden pit-Muster, worauf sodann die übliche Weiterbearbeitung bis zur Fertigstellung des zum Abguß geeigneten CD-Masters erfolgt.A CD master for the production of hologram-secured CDs can also be produced, for example, by embossing the hologram into the as yet unexposed photoresist and then exposing the photoresist with the CD information in a conventional manner and processing it further, or by exposing the photoresist twice , once with the hologram and then with the pit pattern to be generated, whereupon the usual further processing takes place until the CD master suitable for casting is completed.
Bei einer CD kann in den Aufzeichnungsbereich das ein Sicherheitsmerkmal darstellende Hologramm in die erhabene Oberfläche des Aufzeichnungsbereichs eingebracht werden, die aus den "lands" zwischen den Vertiefungen (pits) und den Abständen zwischen den Spuren besteht, die üblicherweise 1 ,6 μm beträgt. In the case of a CD, the hologram representing a security feature can be introduced into the raised surface of the recording area, which consists of the "lands" between the depressions (pits) and the distances between the tracks, which is usually 1.6 μm.

Claims

Optisches SpeichermediumOptical storage medium
Patentansprücheclaims
Optisches Speichermedium, vorzugsweise CD oder DVD mit einer aus aufeinanderfolgenden Vertiefungen (pits) bestehenden spiraligen Spur, dem in dem Aufzeichnungsbereich ein Hologramm überlagert ist,Optical storage medium, preferably CD or DVD with a spiral track consisting of successive depressions (pits), on which a hologram is superimposed in the recording area,
dadurch gekennzeichnet,characterized,
daß mindestens ein Hologramm mindestens in einen die Informationsträger, z.B. in den die Vertiefungen einfassenden Oberflächenbereich des Aufzeichnungsbereichs, eingebracht ist.that at least one hologram is in at least one of the information carriers, e.g. into the surface area of the recording area enclosing the depressions.
Speichermedium nach Anspruch 1 , dadurch gekennzeichnet, daß das Verhältnis der Tiefen der holografischen Phasenstruktur zu den Tiefen der Vertiefungen (pits) 1 :5 bis 1 :10 und vorzugsweise 1 :6 beträgt. Speichermedium nach' Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Hologramm maschinenlesbare Merkmale enthält. Storage medium according to Claim 1, characterized in that the ratio of the depths of the holographic phase structure to the depths of the depressions (pits) is 1: 5 to 1:10 and preferably 1: 6. Storage medium according to ' Claim 1 or 2, characterized in that the hologram contains machine-readable features.
EP00981376A 2000-02-04 2000-12-14 Optical storage medium Withdrawn EP1252624A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10004870 2000-02-04
DE10004870A DE10004870A1 (en) 2000-02-04 2000-02-04 Optical storage medium
PCT/EP2000/012747 WO2001057863A1 (en) 2000-02-04 2000-12-14 Optical storage medium

Publications (1)

Publication Number Publication Date
EP1252624A1 true EP1252624A1 (en) 2002-10-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00981376A Withdrawn EP1252624A1 (en) 2000-02-04 2000-12-14 Optical storage medium

Country Status (7)

Country Link
US (1) US20030133401A1 (en)
EP (1) EP1252624A1 (en)
JP (1) JP2003522365A (en)
AU (1) AU1863901A (en)
CA (1) CA2420943A1 (en)
DE (1) DE10004870A1 (en)
WO (1) WO2001057863A1 (en)

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Also Published As

Publication number Publication date
US20030133401A1 (en) 2003-07-17
CA2420943A1 (en) 2001-08-09
WO2001057863A1 (en) 2001-08-09
JP2003522365A (en) 2003-07-22
AU1863901A (en) 2001-08-14
DE10004870A1 (en) 2001-08-09

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