WO2002095745A1 - Procede pour produire des supports d'enregistrement optiques et un disque-maitre pour leur fabrication - Google Patents

Procede pour produire des supports d'enregistrement optiques et un disque-maitre pour leur fabrication Download PDF

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Publication number
WO2002095745A1
WO2002095745A1 PCT/EP2002/005575 EP0205575W WO02095745A1 WO 2002095745 A1 WO2002095745 A1 WO 2002095745A1 EP 0205575 W EP0205575 W EP 0205575W WO 02095745 A1 WO02095745 A1 WO 02095745A1
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WO
WIPO (PCT)
Prior art keywords
information
layer
volume
optical storage
phase object
Prior art date
Application number
PCT/EP2002/005575
Other languages
German (de)
English (en)
Inventor
Irina Menz
Günther Dausmann
Original Assignee
Hsm Holographic Systems München Gmbh
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 München Gmbh filed Critical Hsm Holographic Systems München Gmbh
Publication of WO2002095745A1 publication Critical patent/WO2002095745A1/fr

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Classifications

    • 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
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024—Hologram nature or properties
    • G03H1/0248—Volume holograms
    • 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
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/20—Copying holograms by holographic, i.e. optical means
    • G03H1/202—Contact copy when the reconstruction beam for the master H1 also serves as reference beam for the copy H2
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
    • 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
    • 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
    • G11B7/28—Re-recording, i.e. transcribing information from one optical record carrier on to one or more similar or dissimilar record carriers
    • 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
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024—Hologram nature or properties
    • G03H1/0244—Surface relief holograms
    • 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
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/20—Copying holograms by holographic, i.e. optical means
    • G03H2001/207—Copying holograms by holographic, i.e. optical means with modification of the nature of the hologram, e.g. changing from volume to surface relief or from reflection to transmission

Definitions

  • the invention relates to methods for producing an optical storage medium or a master for producing optical storage media by means of contact copying, and storage media that can be produced using these methods.
  • Optical storage media in the form of disks are e.g. B. known as CDs (compact discs), DVDs (digital versatile discs) or MDs (mini discs).
  • information is e.g. B. is stored digitally below a transparent protective layer in the CD surface vapor-coated with a reflective aluminum layer in the form of a dense sequence of microscopically fine depressions (“pits”, for example the depth of a quarter of the read-out wavelength).
  • pits for example the depth of a quarter of the read-out wavelength.
  • the digital information is read with the help of an optoelectronic pick-up system that the pits contact-free scans a focused laser beam, such as a semiconductor laser, while conventional CDs scan at a wavelength of around 780 nm. DVDs are scanned using a similar principle at a wavelength of around 650 nm, which increases the information density.
  • mini discs the information is stored digitally in a magnetic layer. This is heated point by point and magnetically aligned using a magnetic writing head. The scanning takes place with polarized laser light, which rotates its plane of polarization depending on the magnetic orientation during reflection.
  • the wavelengths for generating the volume holographic structures must be smaller than the respective reading wavelength to be used, for. B be 650 nm.
  • the volume holographic structures would therefore have to be exposed to very short-wave light, which would require a high level of optical complexity.
  • a high-resolution phase object is used in the method according to the invention for producing a master.
  • a phase object can either be a phase plate, preferably a mirrored plate, or an amplitude mask.
  • an arrangement of coding areas is provided, which comprise phase positions, which correspond to recessed or raised coding areas, an amount of information being stored by the arrangement.
  • non-transparent or non-reflecting regions are provided, the arrangement of which stores an amount of information.
  • the non-transparent or non-reflective areas can e.g. B. be blackened.
  • Such a phase object is brought into contact with a light-sensitive volume layer.
  • the phase object is exposed through the light-sensitive volume layer with a plane laser wave or by scanning the phase object with a laser, so as to achieve a volume hologram in the light-sensitive volume layer by interference of the incident laser light with the laser light modulated by the phase object.
  • a volume-holographic image of the phase object is thus generated in the light-sensitive volume layer.
  • the exposure step of the light-sensitive volume layer to generate the volume hologram corresponds to a contact copy.
  • the high resolution of the phase object at a certain wavelength is transferred to the volume hologram. In this way, the high resolution of the phase object, which was produced with a shorter wavelength, is combined with the wavelength selectivity of the volume hologram.
  • the modulation of the laser light is achieved by reflection on a reflective phase object.
  • it is also a modulation by trans- mission possible through a transparent phase plate if the light of the exposure laser is split and only a part is sent through the phase plate and a part directly onto the light-sensitive layer.
  • the light-sensitive volume layer is then optionally developed and the volume hologram is fixed and the phase object is removed.
  • the information of the phase object with the coding areas is stored in the developed light-sensitive volume layer by volume holography and a holographic image will be reconstructed when illuminated with reconstruction light.
  • An amount of information will thus be stored in the master analog or digital with the method according to the invention. However, the amount of information is preferably stored digitally by the lateral arrangement of the coding areas. If a contact copy is made from the masters produced using the method according to the invention, the amount of information which is holographically stored in the volume layer of the master is transferred to the contact copy.
  • holographic structures can be stored in the volume layer, which when reconstructed with reconstruction light illuminate structures that holographically reconstruct their dimensions, e.g. B. correspond to the information-carrying structures of a CD or DVD.
  • the high-resolution phase object can e.g. B. include a metallized arrangement of recessed or raised coding areas, the arrangement storing an amount of information similar to a conventional CD.
  • a plane laser wave is preferably sent through the photosensitive bulk layer onto the metallized surface.
  • a volume hologram of the plate with the depressions in the volume layer is exposed by interference of the irradiated laser wave with the laser light reflected from the metallized phase object.
  • the phase object can be scanned with a laser.
  • a transparent plate with an arrangement of phase positions that correspond to recessed or raised coding areas is used as the high-resolution phase object.
  • the light-sensitive volume layer is exposed through the transparent phase object. Due to the phase positions, the optical path of the plane laser light passing through the transparent plate is of different lengths. This leads to a phase shift between the different parts of the laser light and to the interference of these components. In this way, an image of the transparent plate is generated holographically in the light-sensitive volume layer.
  • the provision of the phase object comprises the high-resolution production of the phase object by exposure of a resist layer.
  • a high-resolution production can, for. B. can be achieved by using ultraviolet light, which enables a high resolution of the lateral structure in the resist layer.
  • the resist layer exposed to ultraviolet light can be developed in a conventional manner in order to produce a phase object with depressions in the resist layer which are used directly as a phase object or with the aid of known litographic methods, eg. B. etching in another structure, e.g. B. a glass plate, which can then be transferred with z. B. high refractive index dielectric layers.
  • an electron beam sensitive material eg. B. polymer or PMMA
  • exposed to an electron beam the movement of which is preferably computer-controlled.
  • a corresponding exposure can be achieved with high-resolution electron beam exposure.
  • a surface layer of the phase object is partially removed with the aid of a preferably computer-controlled laser beam, so as to produce recessed or raised coding areas by which information is stored. The The arrangement of the areas generated in this way is determined in advance and used to control the laser beam or the electron beam.
  • the phase object can also comprise an amplitude mask which does not comprise any recessed or raised, but rather non-transparent or non-reflective coding areas.
  • the lateral arrangement of the coding regions represents the amount of information and is transferred into a light-sensitive volume layer using the method according to the invention.
  • Short-wave ultraviolet light an electron beam or a laser beam can also be used to produce the amplitude mask, which produce non-transparent or non-reflecting regions in a suitably selected material.
  • angle information can also be stored in the master.
  • the phase object is designed in such a way that the arrangement of the coding areas, which is used to store the amount of information, is not parallel to the surface of the phase object, so that an angle information is stored in the volume hologram during the step of exposing the volume layer.
  • the volume hologram has angular selectivity. An optical storage medium which is produced by contact copying from such a master can then only be read out from a certain angle with a reading laser light beam.
  • a further volume-holographic structure can be produced in the light-sensitive volume layer after the first exposure in the light-sensitive volume layer under a different exposure angle or another wavelength.
  • a phase object is used in which, according to the embodiment described above, the arrangement of the coding areas is not parallel to the main surface.
  • a master produced with this embodiment of the method according to the invention contains two or more sets of information which are at different angles and / or different Wavelengths are stored. When the optical storage medium is produced by contact copying from this master, the wavelength selectivity or the angle selectivity is transmitted into the optical storage medium.
  • volume holograms of the phase object or the phase objects can also be generated in the optical storage medium by direct contact copying, without a master copying process being interposed.
  • different phase objects are transferred to the volume storage layer of an optical storage medium by a plurality of contact copy steps, as described above for the generation of a master. This procedure is particularly suitable for transmitting the information of different phase objects with different angle information or different wavelength information.
  • a master produced with the method according to the invention for producing a master is brought into contact with a storage disk which comprises a photosensitive volume storage layer.
  • This volume storage layer and the master are exposed to light of the later read-out wavelength of the optical storage medium in order to produce a holographic contact copy of the master in the volume storage layer.
  • the reconstruction wavelength of the master corresponds to the later read-out wavelength of the optical storage medium.
  • a contact copy of the master is created in the volume storage layer of the optical storage medium.
  • This contact copy contains both the angle selectivity information and the wavelength selectivity information of the master produced using the method according to the invention. If the master already contains several stored sets of information that have been stored holographically in the light-sensitive volume layer of the master at different angles or at different wavelengths, the contact copy of the master also contains several sets of information that can be read out at different angles or with different wavelengths.
  • a plurality of contact copies of a plurality of masters produced according to the invention are produced, information quantities being stored in the individual masters at different angles or different wavelengths.
  • the optical storage medium produced in this way thus contains the information from different masters, which can be read in each case with different wavelengths or different angles.
  • the corresponding amount of information can be selected by selecting the readout wavelength or by selecting the angle at which an optical storage medium produced in this way is read out.
  • An optical storage medium comprises a volume hologram structure in which at least one amount of information is stored.
  • elements When illuminated with light of the reconstruction wavelength of the volume hologram structure, elements are holographically reconstructed in which at least an amount of information is coded for analog or digital reading. It is particularly simple if the information of at least one set of information is digitally coded by the lateral arrangement of the elements holographically reconstructed during the illumination.
  • a structure is holographically reconstructed, the digital information by the arrangement of the holographically reconstructed elements represents elements.
  • An optical storage medium according to the invention can advantageously be produced using a method according to the invention or as a contact copy of a master produced according to the invention.
  • the storage medium according to the invention can be transparent or have any color. This also increases the authenticity or recognition value compared to conventional silver-colored CDs.
  • the volume hologram structure comprises at least one amount of information that corresponds to a tracking track that is used by a readout device for control.
  • a tracking track z. B.
  • the speed or other readout parameters can be set and set by reading out the tracking track from the readout device.
  • the tracking track can also only include information for guiding a readout laser light. If the track information is not copied or not copied correctly, this prevents the stored information from being read out.
  • a tracking track which is stored as a quantity of information in the volume hologram structure and is queried by the reading device, thus represents effective protection against counterfeiting or copying.
  • the holographically reconstructed elements of a set of information are holographic images of the real information-carrying structure of a conventional, in particular digital storage medium such as a CD, CD-ROM or DVD.
  • a conventional, in particular digital storage medium such as a CD, CD-ROM or DVD.
  • the information that is stored in the conventional storage means is stored holographically in the optical storage medium according to the invention.
  • the information structure itself remains unchanged and does not require any additional evaluation algorithms.
  • the optical storage medium according to the invention has the external dimensions which allow reading out with a conventional reading device for conventional storage means, such as a CD, CD-ROM or DVD.
  • the optical storage medium according to the invention can be used without providing an additional reading device.
  • only the amount of information which represents a holographic image of a conventional non-holographic storage medium can be called up with the conventional reading device.
  • Amounts of information that have a different reconstruction wavelength or a different reconstruction angle than the read-out wavelength or the read-out angle of the corresponding conventional storage means cannot be read out with the conventional device.
  • the optical storage medium according to the invention can also be used in conventional devices, additional information being able to be stored in a manner that cannot be read out by conventional devices.
  • an amount of information is formed by the digital information that is to be stored on the digital storage medium.
  • Another amount of information corresponds to a tracking track, as is also the case with conventional digital optical storage media, e.g. B. a CD, is used to control the player.
  • the corresponding information is not actually stored in the optical storage medium, but only arises through illumination with the reconstruction light by holographic reconstruction.
  • the amounts of information such. B. stored with a wavelength that corresponds to the read-out wavelength of a conventional optical storage medium, such a data carrier can be used with appropriate external dimensions in a conventional player.
  • a digital optical storage medium according to the invention is illuminated by the readout semiconductor laser, holographically reconstructs the arrangement of elements which encode the digital information, and is read out by the read head of the conventional playback device.
  • the tracking track is read in the same way. Only if the amount of information of the tracking track is correctly stored on the digital optical storage medium according to the invention, the reading device can read out the digital information correctly. Only then is reading out possible on a conventional player. In this way, effective protection against counterfeiting and copying is realized.
  • the information layer of an advantageous embodiment has a further volume holographic element which, when illuminated, holographically reconstructs information that is visually recognizable or machine-readable at an angle that does not correspond to a reconstruction angle of an information set.
  • the visually recognizable information serves for additional authenticity detection or a representation of a special aesthetic effect. It can also indicate a brand, a title or the manufacturer's name.
  • the optical storage medium is unmistakably provided with a holographic structure, which creates a corresponding optical effect and enables recognition.
  • Such a volume holographic element is difficult to forge and cannot be reproduced by mechanical molding. This ensures an additional increase in the recognition value.
  • this additional volume holographic element which reconstructs holographically recognizable information when illuminated, has a different reconstruction angle than any quantity of information which is stored in the information layer by volume holography, the additional volume holographic element does not interfere with the reading of the stored information quantities.
  • a similar effect can be achieved if the additional volume holographic element holographically reconstructs the visually recognizable or machine-readable information in a color that does not correspond to a reconstruction wavelength of an information set.
  • the additional volume holographic element does not interfere with a reading with red light.
  • the additional information layer with the information-carrying volume hologram structure of the optical storage medium according to the invention can be provided on a disk which carries further information digitally in the form of an arrangement of real recesses. Such recesses, as z. B. from CDs are known, can further increase the storage density by storing information in addition to the volume holographically stored information.
  • a similar effect can be achieved if further information is provided digitally in the form of an arrangement of areas of different magnetization on a disk, one surface of which is the information layer with the information-carrying volume hologram layer.
  • a storage medium enables the volume holographic storage of information in the information layer with the volume hologram structure, if necessary at different angles, different wavelengths and / or different reconstruction depths.
  • information can be stored in the form of the arrangement of the magnetized areas.
  • FIG. 1 shows in cross section the reading process of a quantity of information on a digital optical storage medium, which is produced by contact copying from a master, which was produced with a method according to the invention
  • FIG. 2 shows a readout process in another optical storage medium, which was generated as a contact copy of a master, which was produced with a method according to the invention
  • FIG. 3 shows the reading process of a further optical storage medium, which was generated as a contact copy of a master produced by a method according to the invention
  • 4 shows a method step in the implementation of a method according to the invention for producing a master
  • FIG. 5 shows a step in the implementation of another method according to the invention for producing a master.
  • FIG. 1 shows a plastic disc 1 in which a volume hologram for displaying at least one quantity of information is stored.
  • the disc 1 is z. B. round and is rotated for reading about axis 7. Similar to a CD, the information is stored in a spiral.
  • the information is read out with a read head 3, which in the embodiment shown can detect wavelength selectively. For this purpose, a laser beam 5 of a defined wavelength is directed onto the pane 1 and the reflection is detected. Alternatively, a band of wavelengths is sent in the direction of the disk 1 and only one wavelength is detected.
  • the disc carries a volume hologram, which z. B. is in a polymer layer on a support layer and the structure of a conventional CD is holographically reconstructed when illuminated.
  • the corresponding structure is holographically reconstructed by the illumination with the light of the reading head 3 and acts like the mirrored surface of a CD.
  • various amounts of information are stored in digital form with different reconstruction wavelengths, so that the corresponding amount of information that is to be read out can be determined by selecting the read-out wavelength.
  • the readout wavelengths only have to be so far apart that they do not interfere with another readout process.
  • an amount of information is e.g. B. stored with about 780 nm, as is the case with normal CD-ROM drives.
  • the second amount of information is about 540 nm, saved green light. The read head can differentiate between these wavelengths and only reads out the information addressed by the wavelength.
  • FIG. 2 shows another embodiment with a plastic disk 101 with a volume hologram structure.
  • the disk 101 can also be rotated about the axis 107 in order to be able to be read out like a normal CD.
  • the information is again stored in spiral tracks.
  • the reading head 103 only detects information that is holographically reconstructed in the vertical direction when the disk 101 is illuminated.
  • the read head 109 only registers information that is reconstructed when illuminated under the corresponding angle of the beam 111.
  • 109 shows only the detector for the sake of simplicity, and 111 shows the light reconstructed from the holographic structure of the corresponding amount of information at the reconstruction angle.
  • the light source must be arranged in the reconstruction angle, so z. B. shine perpendicular to the disk 101.
  • irradiation can be carried out at a certain angle and read out at a perpendicular angle.
  • a further hologram is additionally stored in the holographic structure of the pane 101.
  • B. reconstructed visually visible information in the direction 113 with white light.
  • This visually visible information can e.g. B. be a holographic image that creates a special aesthetic effect or serves as a readable or machine-readable security feature.
  • the visually visible information 113 does not hinder the reading process.
  • the disk 1, 101 is rotated about the axis 7, 107 for reading out.
  • the read heads are moved radially so that the spiral information track is scanned like a conventional CD.
  • a tracking track which controls the movement of the reading head.
  • the information of this tracking track can also be stored holographically in the volume structure of the pane 1, 101.
  • FIG. 3 shows a further embodiment.
  • the disk 201 is shown in an enlarged section. While FIGS. 1 and 2 show cross sections through the entire digital optical storage medium, FIG. 3 shows only a section along a spiral information track.
  • the pane 201 has a carrier layer 213 which, unlike in the embodiments in FIGS. 1 and 2, has real depressions 217 which contain digitally stored information such as, for example, B. included on a CD. With a reading head 203, the information which is digitally coded in the arrangement of the depressions 217 can be read out with the aid of laser light 201.
  • volume holographic information On the real recess structure 213 there is a polymer layer 215, in which volume holographic information is stored according to the invention.
  • This volume holographic information can be read out at a reconstruction angle with the reading head 209. 211 shows the light reconstructed from the volume holographic structure.
  • part of the information is actually stored as depressions 217 in the carrier layer 213 and a further part of the information is volume-holographically stored in the plastic layer 215.
  • a production method according to the invention for a master is described below with reference to FIG. First, in a manner not shown Resist layer 16 in a desired pattern z. B. exposed and developed with a UV laser. In this way, depressions (pits) 17 or raised areas (lands) 18 are created, the lateral arrangement of which stores a quantity of information. Alternatively, the structure of pits and lands can be written into an appropriate electron-sensitive layer with the aid of an electron beam or removed by laser ablation. The structure 16 produced in this way is vapor-deposited in a conventional manner with a metal layer 15.
  • a transparent support structure 13 with a light-sensitive volume layer 14 is brought into contact with the phase object 16.
  • the layer structure thus constructed is illuminated with flat laser light 11.
  • the laser light passes through the carrier structure 13 and the light-sensitive volume layer 14 and is reflected by the metallic layer 15.
  • the reflected laser light 12 and the incident laser light 11 interfere to generate a volume hologram in the light-sensitive volume layer.
  • the structure can be scanned with the aid of a laser beam instead of the plane laser wave.
  • phase object is stored in a wavelength-selective manner as a hologram in the light-sensitive volume layer 14.
  • the light-sensitive volume hologram layer 14 is developed in a known manner and optionally fixed.
  • a further volume hologram can be exposed in the light-sensitive volume hologram layer, which serves as a security feature and is either visually recognizable or machine-readable.
  • contact copies of the master thus generated with the volume holographic information stored in the layer 14 can be produced in order to produce optical storage media according to the invention.
  • the step shown in FIG. 4 is carried out several times on a volume hologram layer 14 as follows. After a first volume hologram structure has been generated in the light-sensitive volume layer 14, another phase object 16 is brought into contact with the light-sensitive volume layer 14. The resulting layer structure is exposed with a flat laser wave with a different wavelength than in the first exposure described above. A further volume hologram structure with a different reconstruction wavelength is thus generated in the light-sensitive volume layer 14. After removal of the phase object 16 and development of the light-sensitive volume layer 14, an optical storage medium is created, as is described with reference to FIG. 1.
  • FIG. 5 describes a step of a modified manufacturing method according to the invention.
  • the phase object 16 here comprises a lateral arrangement of depressions or raised areas, which is arranged at an angle to the main surface of the phase object 16.
  • the phase object 16 is in turn brought into contact with a layer structure which comprises a support 13 and a light-sensitive volume layer 14. The angle thus arises between the lateral arrangement of depressions and raised areas and the light-sensitive volume layer 14.
  • the structure is illuminated with plane laser light 19 at the same angle ⁇ to the normal.
  • the reflected laser light 20 and the irradiated laser light 19 interfere in the light-sensitive volume layer 14 to form a volume hologram, in which this also contains the information about the angle ⁇ that existed between the lateral arrangement of the phase object 16 and the light-sensitive volume layer 14 during exposure.
  • An optical storage medium according to the invention is obtained by holographic contact copy of the volume hologram, which is stored in the light-sensitive volume layer 14.
  • phase objects 16 with different angle information can be holographically stored in a light-sensitive volume layer 14.
  • the individual sets of information that carry different angle information can only be read out with reconstruction light at a certain angle.
  • volume layer is holographically copied into optical storage media with a plurality of amounts of information stored holographically at different angles.
  • optical storage media are produced, as described with reference to FIG. 2.
  • a light-sensitive volume layer 14 of the master can have both wavelength-selective and angle-selective information holographically stored in it, which is transferred to the optical storage medium during mass production by holographic contact copies.
  • a method according to the invention for the production of a master is described, from which optical storage media can optionally be produced in mass production by contact copying.
  • the method according to the invention also allows the production of optical storage media without the use of a master.
  • the production steps described for the master production are carried out directly on an optical storage medium, with several different phase objects being transferred into the light-sensitive volume storage layer of the optical storage medium in several holographic contact copy steps.
  • Such a method is also suitable for mass production, with the optical storage media multiple contact copy of multiple different phase objects.
  • the methods according to the invention combine the wavelength selectivity and / or the angle selectivity of a volume hologram with the high resolution of a high-resolution phase object.

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

Abstract

L'invention concerne un procédé pour produire un support d'enregistrement optique et un disque-maître pour la fabrication de supports d'enregistrement optiques par copie contact. Ce procédé consiste à mettre à disposition au moins un objet de phase (16) à haute résolution qui comporte soit une lame de phase présentant un ensemble de zones de codage qui comprennent des positions de phase correspondant à des zones de codage en creux ou en relief, soit un masque d'amplitude comportant un ensemble de zones de codage non transparentes ou non réfléchissantes, l'ensemble de zones de codage permettant de mémoriser une quantité d'informations. L'objet de phase est mis en contact avec une couche volumique (14) photosensible qui est ensuite exposée par éclairage de l'objet de phase avec une onde laser (11) plane traversant la couche volumique photosensible ou par balayage de l'objet de phase avec un laser à travers la couche volumique photosensible pour produire un hologramme épais dans la couche volumique photosensible par interférence de la lumière laser incidente avec une lumière laser modulée par l'objet de phase. L'invention concerne en outre un procédé pour produire un support d'enregistrement optique au moyen d'un disque-maître produit selon le procédé de l'invention, ainsi que des supports d'enregistrement optiques produits selon le procédé de l'invention.
PCT/EP2002/005575 2001-05-22 2002-05-21 Procede pour produire des supports d'enregistrement optiques et un disque-maitre pour leur fabrication WO2002095745A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10125014.2 2001-05-22
DE10125014 2001-05-22
DE10136669A DE10136669A1 (de) 2001-05-22 2001-07-27 Verfahren zur Herstellung von optischen Speichermedien bzw. eines Masters für deren Herstellung
DE10136669.8 2001-07-27

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EP1882201A2 (fr) * 2005-05-17 2008-01-30 InPhase Technologies, Inc. Procedes et systemes pour l'enregistrement de supports de stockage holographiques
US8199388B2 (en) 2002-11-22 2012-06-12 Inphase Technologies, Inc. Holographic recording system having a relay system

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EP0271300A2 (fr) * 1986-12-06 1988-06-15 THORN EMI plc Copie de supports portant des informations enregistrées numériquement
EP0374256A1 (fr) * 1988-04-12 1990-06-27 Dai Nippon Insatsu Kabushiki Kaisha Support d'enregistrement optique et procede de fabrication
WO1990011601A2 (fr) * 1989-03-22 1990-10-04 Gibson Stewart Harry Methode de fabrication de disques optiques
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EP0271300A2 (fr) * 1986-12-06 1988-06-15 THORN EMI plc Copie de supports portant des informations enregistrées numériquement
EP0374256A1 (fr) * 1988-04-12 1990-06-27 Dai Nippon Insatsu Kabushiki Kaisha Support d'enregistrement optique et procede de fabrication
WO1990011601A2 (fr) * 1989-03-22 1990-10-04 Gibson Stewart Harry Methode de fabrication de disques optiques
US6272095B1 (en) * 1994-07-22 2001-08-07 California Institute Of Technology Apparatus and method for storing and/or reading data on an optical disk

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
US8199388B2 (en) 2002-11-22 2012-06-12 Inphase Technologies, Inc. Holographic recording system having a relay system
US8786923B2 (en) 2002-11-22 2014-07-22 Akonia Holographics, Llc Methods and systems for recording to holographic storage media
EP1882201A2 (fr) * 2005-05-17 2008-01-30 InPhase Technologies, Inc. Procedes et systemes pour l'enregistrement de supports de stockage holographiques
EP1882201A4 (fr) * 2005-05-17 2009-10-21 Inphase Tech Inc Procedes et systemes pour l'enregistrement de supports de stockage holographiques

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