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WO1999023649A1 - Support d'information tridimensionnel - Google Patents

Support d'information tridimensionnel Download PDF

Info

Publication number
WO1999023649A1
WO1999023649A1 PCT/IL1998/000535 IL9800535W WO9923649A1 WO 1999023649 A1 WO1999023649 A1 WO 1999023649A1 IL 9800535 W IL9800535 W IL 9800535W WO 9923649 A1 WO9923649 A1 WO 9923649A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
carrier according
type information
fluorescent material
carrier
Prior art date
Application number
PCT/IL1998/000535
Other languages
English (en)
Inventor
Eugene B. Levich
Boris Glushko
Original Assignee
Omd Devices, L.L.C.
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 Omd Devices, L.L.C. filed Critical Omd Devices, L.L.C.
Priority to AU97594/98A priority Critical patent/AU9759498A/en
Publication of WO1999023649A1 publication Critical patent/WO1999023649A1/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

Definitions

  • This invention is in the field of high density and high capacity storage devices and relates to a three-dimensional information carrier, such as compact discs (CD), tapes, cards, or the like, in which information is recorded and read out by optical means.
  • a three-dimensional information carrier such as compact discs (CD), tapes, cards, or the like, in which information is recorded and read out by optical means.
  • Optical discs are known memory devices which are widely used particularly with playback and computer devices for retrieving musical and software compositions.
  • Conventional optical discs are of three kinds: Read Only Memory (ROM), Recordable Memory or so-called “Write-Once-Read-Many” (WORM), .and Rewritable Memory.
  • ROM Read Only Memory
  • WORM Write-Once-Read-Many
  • WORM Read Only Memory
  • WORM Write-Once-Read-Many
  • WORM Write-Once-Read-Many
  • WORM Low melting temperature metal layer coated on a substrate.
  • the rewritable disk includes a recording layer made of a phase changeable material.
  • Three-dimensional information carriers such as optical disks or optical cards, have been developed to significantly increase the amount of stored information, as compared to conventional two-dimensional optical memory devices.
  • the capacity of a three-dimensional optical memory device is proportional to the third order of a reading radiation wavelength.
  • the total thickness of a three-dimensional optical memory device can be of 1 mm .and can be formed of information layers having a thickness of 0.01 mm.
  • the storage capacity of such a device would be 100 times greater than the capacity of a single layer.
  • a three-dimensional optical memory device for example in U.S. Patent No. 4,090,031.
  • This device comprises a substrate and a plurality of data layers provided on one side of the substrate.
  • Each of the layers comprises data tracks formed of lines of data spots.
  • the data spots are formed of either binary coded digital information, or frequency or pulse length modulated analog information, which is photographically recorded.
  • the data spots are formed of radiation-reflective metal material having a reflection index different from that of the data layers.
  • conventional reading techniques fail to successfully read out the information stored in such a "reflective" information carrier having more than two data layers, owing to unavoidable multiple reflection and diffraction that occur at the upper and lower information layers, when accessing them with an incident radiation. This results in undesirable crosstalk between the data regions of different layers, affecting the signal-to-noise ratio.
  • the single commercially available three-dimensional optical disk known as DVD comprises two information-carrying layers.
  • One of the main goals of the computer industry is directed towards minimizing the weight and dimensions of the personal computer. These parameters of the personal computer strongly depend on the weight and dimensions of the high density and high capacity memory device used therein. Unfortunately, the above disadvantages of the "reflective" multilayer optical disks prevent them from replacing conventional magnetic hard disks, which are definitely heavier, larger and more expensive, as compared to the optical disks.
  • a three-dimensional information carrier comprising at least two information layers that are of different types with respect to recording data therein, wherein at least one of said at least two information layers is adapted for recording data therein, at least one of said at least two information layers comprises a substantially fluorescent material capable of producing output fluorescent radiation when interacting with a predetermined incident radiation.
  • the information carrier is composed of at least two functionally different information layers, i.e. different types with respect to recording the data therein.
  • at least one of the layers comprises a fluorescent material capable of producing an output fluorescent radiation when interacting with a predetermined incident radiation.
  • the at least one recording layer may be a data rewritable type information ' layer.
  • the at least one layer comprising the fluorescent material may be a write-once type information layer, or a read-only information layer.
  • the at least one recording layer may be a write-once type information layer, in which case, the at least one layer comprising the fluorescent material may be a rewritable type information layer, or a read-only information layer.
  • the information layer comprises at least one read-only type information layer, at least one write-once type information layer, and at least one rewritable type information layer.
  • the at least one write-once information layer is located between the at least one read-only type information layer and the at least one rewritable type information layer.
  • an information processing system comprising the above information carrier and a driver associated therewith for reading and writing data therein. More specifically, the present invention is used with an optical disk as an information carrier and is therefore described below with respect to this application. However, the same may be applied to optical tapes, cards or the like three-dimensional structures.
  • Fig. 1 is a schematic cross-sectional view of an information carrier constructed according to one embodiment of the invention
  • Figs. 2a and 2b illustrate two examples, respectively, of the construction of a read-only type information layer in the carrier of Fig. 1;
  • Figs. 3a and 3b are cross-sectional views of a write-once type information layer suitable for the carrier of Fig. 1, constructed according to one example of the invention, illustrating, respectively, two operational positions of the carrier;
  • Fig. 4a is a cross sectional view of a write-once type information layer suitable for the carrier of Fig. 1, constructed according to another example of the invention;
  • Fig. 4b is a cross-section of Fig. 3 a taken along a line A-A;
  • Fig. 5 is a graphical illustration of typical absorption spectra of a photochromic material used in the information carrier of Fig. 1;
  • Fig. 6 illustrates an information processing system utilizing the information carrier of Fig. 1.
  • FIG. 1 there is illustrated an optical disk (constituting an information carrier), generally designated 1, constructed according to one embodiment of the invention.
  • the disk 1 is composed of a plurality of parallel spaced-apart information layers of three different types, generally at Li, L 2 and L 3 .
  • Layers L ⁇ are of a read-only type
  • layers L 2 are of a write-once type
  • layer L 3 is of a rewritable type.
  • two protective layers L p are provided at opposite sides of the disk 1.
  • the intermediate layers Lj and protective layers L p are formed of a substantially optically transparent material.
  • the thickness of each information layer is approximately 0.3-20 ⁇ m, while the thickness of each intermediate layer is approximately 5-500 ⁇ m.
  • Fig. 2a illustrates one example of the read-only type information layers Li according to the invention.
  • Information stored in the layer ⁇ is in the form of a pattern having a plurality of spaced-apart recording regions, generally at R rec containing fluorescent material, for example organic fluorescent dye.
  • the recording regions R rec are spaced by surrounding, substantially optically transparent regions R t .
  • each recording region R' re c is in the form of a stack comprising three layers Ln, L re f and L a b, formed of, respectively, fluorescent, reflective and absorbing materials with respect to a predetermined radiation spectrum.
  • the layers L ⁇ and L ⁇ f when illuminated by an incident radiation within this predetermined spectrum, would produce fluorescent .and reflected output radiation, respectively.
  • the reflective layers L ref serve as mirrors attached to each fluorescent layer Lfl.
  • the provision of such a reflective material underneath the fluorescent material increases the fluorescent properties of the layer L ⁇ .
  • the provision of the absorbing layer L a b eliminates an undesirable cross-talk between the adjacent recording regions, when reading information stored in the layers Li.
  • Multilayer read-only memory devices exemplified in Figs. 2a and 2b and methods of their manufacture are disclosed in U.S. Patent Applications Nos. 08/956,052 and 08/944,402, assigned to the assignee of the present application.
  • each of the write-once layers L 2 in its ready-to-write position has a pattern in the form of spiral or spaced parallel concentric circles, generally at CS, made of a fluorescent material and surrounded by transparent regions R t .
  • Fig. 4b illustrates a so-called "recorded" position of the layers L 2 , taken as a cross-section of Fig. 4a along the line A-A.
  • the fluorescent spirals or circles are now patterned by spaced-apart bleached regions Rbi.
  • the write-once layers may be manufactured by any suitable known technique, for example such as disclosed in U.S. Patent Applications Nos.
  • the rewritable information layer L 3 is made of an active medium formed of photochromic-fluorescent compound, generally at PF.
  • a photochromic material is typically characterized by two isometric phases A and B (fluorescence). By absorbing a photon, the molecule in the phase A is transferred to the phase B. The light absorption in the phase B l o results in the fluorescence and back transfer to the phase A .
  • Fig. 5 graphically illustrates a typical absorption spectra for a photochromic material inserted in a transparent polymer having both phases A and B.
  • Two lobes GA and GB represent the absorption intensity I a bs of phases A and B, respectively, as a function of wavelength ⁇ .
  • the rewritable layer L 3 may be manufactured by any known suitable technique, for example used for manufacturing CD-RW74 commercially available from Maxell.
  • the information is written in the layer L 3 by simply focusing a laser beam of a predetermined wavelength range onto a selected location.
  • 25 binary information is recorded by transferring the photochromic molecules located in the illuminated region, from the inoperative, non-luminescent isometric phase A to operative luminescent isometric phase B, and by varying the fluorescence efficiency (or the amount of fluorescent material) within the illuminated area. Later illumination of these selected regions by a focused laser beam of another appropriate wavelength range causes only the phase B molecules to luminescent. This luminescence is detected as the stored binary data.
  • the stored data can be erased either by heating or by uniformly illuminating the layer L 3 , for example by a suitable laser.
  • the wavelength selection for writing/reading/erasing processes is based on the following.
  • the operational laser spectrum should be within the "left" part of the phase A absorption band.
  • the proper wavelength should be at the maximal absorption bandwidth of the phase B.
  • the reading wavelength should be shifted to the "right" side of the phase B absorption band.
  • the manufacture of information disk 1 may utilize the mechanical replication, using injection molding of a policarbonate disk substrate formed with the above-described cells-like or spiral-like pattern.
  • the cells and spirals are then filled with the fluorescent material, using spin-coating, dipping or other suitable techniques.
  • the substrate surface is cleaned from the remaining fluorescent material located out of the cells or spiral, and many substrates so processed are glued together to form the multilayer fluorescent information disk 1.
  • disk 1 may be manufactured using photolithography, holography or other optical replication methods. Reading information stored in disk 1 is accomplished using various fluorescent reading/recording devices disclosed in co-pending applications assigned to the assignee of the present application.
  • the disk 1 is rotated relatively fast, relative to that of the recording procedure, and no changes in the disk structure is observed due to relatively small interaction time between the reading radiation and the disk, and relatively low power of the reading laser.
  • the disk 1 rotates sufficiently slowly during the recording procedure, so as to provide enough time for reduction of the fluorescent signal by heating or bleaching the fluorescent material.
  • the recording procedure can be performed also by a special, high power, recording device.
  • the main principles underlying the implementation of the multilayer disk 1, in distinction to the conventional three-dimensional (i.e. two-layer) DVD, are based on the fact that substantially no-reflection occurs when reading in the disk.
  • the reading radiation and output radiation to be detected are within different spectrums.
  • the disk 1 has the following advantageous features:
  • light source may be either coherent or non-coherent
  • FIG. 6 illustrating a processing system, generally designated 10, constructed generally similar to conventional systems of this kind, but utilizing the disk 1 as an information carrier.
  • the system 10 comprises a computer unit 12 and a display unit 14.
  • the disk 1 is associated with a suitable drive 16, which is either an external device coupled to the computer unit 12 in a conventional manner or is integral with the unit 12.
  • the disk 1 may replace a conventional magnetic hard disk or be used in addition thereto as a separate memory device.
  • the construction and operation of the disk drive 16 do not form the part of the present invention and need not be specifically described, except to note the following.
  • This drive includes a suitable optical head and a driving means for rotating the disk about its axis and providing a relative displacement between the disk .and the optical head to read/record/erase the information in an addressed information layer.
  • the optical head includes a laser source, a light directing optics, a focus-error correction unit and a detection unit. These elements may be arranged and constructed as described in the above-mentioned co-pending applications assigned to the assignee of the present application.
  • the disk 1 may comprise one of the following layers' combination:
  • Read-only type layers Li may be used for storing information requiring no user intervention, such as multimedia, games, audio- and/or video-guides, dictionaries, photo-collections, computer operational systems such as DOS, Windows, etc.
  • write-once type layer L 2 may be used for storing complete versions (or an archive) of those files that were initially edited (i.e. recorded) and duly updated in the rewritable type layer L .
  • These files, once being completed in the rewritable layers L 3 are then transferred by the user to the write-once layers L 2 to be archived there, thereby vacating "space" for new files to be written in the layers L 3 .
  • the disk 1 has the capacity of more than 5GB, and therefore allows for recording therein about 1000 highest quality professional images. More then 10,000 fine images (1E6 pixels) can be stored within a single carrier.
  • the carrier enables the storage of non-compressed format, thereby reducing the electronics of the entire system using the same, e.g. computer system, digital photo and video camera, etc.
  • the information carrier 1 may be in the form of a card, having the capacity of 0.1-1GB and the card storage area of 20-40mm.
  • the card may be flexible and suitable for portable storage as a memory card for various applications, such as credit card, identification smart card, medical/ ealth memory card, audio player, storage for portable computers, hand held computers, portable faxes, radio and telecommunication devices, digital photography, TV glasses, etc.
  • the carrier 1 may be in the form of a micro-disk having the capacity of 1-10GB and the diameter of 20-40mm. Such a disk is suitable for applications in which dimensions and weight of the entire system utilizing the disk are critical.
  • the carrier 1 may be in the form of a disk having the capacity of 10-lOOGB, and a diameter of 60-120mm, similar to a conventional CD-ROM or DVD.
  • the carrier 1 having a significantly larger capacity, about 0.2- 10TB and a diameter of 250-500mm may be used in various industrial and commercial applications, where the capacity of the memory device is the most critical parameter, e.g. remote memory, libraries, space satellites, etc.
  • a handheld computer is a relatively new generation in the computer industry. It was designed to provide users with a computing system much more portable than regular laptops.
  • Today, the main limitation of the handheld computer is associated with the dimensions and weight of a storage means suitable to be used therein. In practice, the conventional high capacity storage means cannot be used with the handheld computer, thereby significantly limiting its functions and consequently the use thereof.
  • the information carrier 1, constructed as described above, could solve the above problem by presenting all known functions of high capacity storage means, such as the magnetic hard disk, whilst being relatively light, small and inexpensive. Due to the advantageous features of the three-dimensional fluorescent information carrier, the above-described processing system could be easily modified by providing an appropriate means capable of replacing one such carrier, completely occupied with the storied information, by a new one.
  • the replaced carrier could be used as an external, archive-like information carrier.
  • the information carrier according to the invention could be used in various intelligent systems.
  • the information carrier may be in the form of disk, card, tape, etc. It may be used in various information processing systems, such as computers, imaging and communication systems, etc.

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  • Optical Recording Or Reproduction (AREA)

Abstract

Ce support d'information tridimensionnel est pourvu d'au moins deux couches d'information, de différents types relativement à l'enregistrement de données dans chaque couche. L'une au moins est conçue pour enregistrer des données et une au moins des deux couches comprend un matériau sensiblement fluorescent. Ce matériau fluorescent est à même de produire un rayonnement fluorescent lorsqu'il interagit avec un rayonnement incident prédéterminé.
PCT/IL1998/000535 1997-11-05 1998-11-05 Support d'information tridimensionnel WO1999023649A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU97594/98A AU9759498A (en) 1997-11-05 1998-11-05 A three-dimensional information carrier

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US6449897P 1997-11-05 1997-11-05
US6449797P 1997-11-05 1997-11-05
US6430197P 1997-11-05 1997-11-05
US60/064,497 1997-11-05
US60/064,301 1997-11-05
US60/064,498 1997-11-05

Publications (1)

Publication Number Publication Date
WO1999023649A1 true WO1999023649A1 (fr) 1999-05-14

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ID=27370602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL1998/000535 WO1999023649A1 (fr) 1997-11-05 1998-11-05 Support d'information tridimensionnel

Country Status (2)

Country Link
AU (1) AU9759498A (fr)
WO (1) WO1999023649A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001006505A1 (fr) * 1999-07-15 2001-01-25 Trid Store Ip, L.L.C. Disque optique fluorescent multicouche avec materiau fluorescent photosensible
WO2001006501A3 (fr) * 1999-07-15 2001-05-25 Trid Store Ip L L C Systeme de stockage de donnees optiques comportant un support d'information tridimensionnel fluorescent combine
US6350820B1 (en) 1999-06-11 2002-02-26 The Dow Chemical Company Hydrogenated block copolymers and optical media discs produced therefrom
US6376621B1 (en) 1999-08-16 2002-04-23 The Dow Chemical Company Hydrogenated block copolymers and optical media discs produced therefrom
WO2002003386A3 (fr) * 2000-06-30 2002-05-30 Verification Technologies Inc Procede et appareil destines a controler l'acces a un support de stockage
US6429260B1 (en) 2000-05-31 2002-08-06 The Dow Chemical Company Olefinic polymer compositions
US6451924B1 (en) 1999-06-11 2002-09-17 Dow Global Technologies Inc. Hydrogenated block copolymers and optical media discs produced therefrom
US6632890B1 (en) 1999-03-19 2003-10-14 Dow Global Technologies Inc. Hydrogenated block copolymer compositions
WO2005004130A1 (fr) * 2003-07-03 2005-01-13 Koninklijke Philips Electronics N.V. Support de stockage multicouche de donnees optiques et son utilisation
US7124944B2 (en) 2000-06-30 2006-10-24 Verification Technologies, Inc. Product packaging including digital data
US7303803B2 (en) 2000-06-30 2007-12-04 Verification Technologies, Inc. Copy-protected optical media and method of manufacture thereof
US9275671B2 (en) 2011-06-09 2016-03-01 Case Western Reserve University Optical information storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0164577A1 (fr) * 1984-05-09 1985-12-18 Kabushiki Kaisha Toshiba Système d'enregistrement et de reproduction optique d'informations
EP0354601A2 (fr) * 1988-08-12 1990-02-14 Pioneer Electronic Corporation Support d'enregistrement optique fournissant la lumière réfléchie de deux longueurs d'ondes différentes, et appareil et méthode de reproduction pour l'utilisation de celui-ci
DE4444988A1 (de) * 1994-12-16 1996-06-20 Wendt Ulrich Dr Rer Nat Habil Aufzeichnungsträger zur Speicherung optisch auslesbarer digitaler Informationen und Verfahren zu seiner Herstellung
WO1998025268A1 (fr) * 1996-12-05 1998-06-11 Omd Devices Llc Memoire optique fluorescente

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0164577A1 (fr) * 1984-05-09 1985-12-18 Kabushiki Kaisha Toshiba Système d'enregistrement et de reproduction optique d'informations
EP0354601A2 (fr) * 1988-08-12 1990-02-14 Pioneer Electronic Corporation Support d'enregistrement optique fournissant la lumière réfléchie de deux longueurs d'ondes différentes, et appareil et méthode de reproduction pour l'utilisation de celui-ci
DE4444988A1 (de) * 1994-12-16 1996-06-20 Wendt Ulrich Dr Rer Nat Habil Aufzeichnungsträger zur Speicherung optisch auslesbarer digitaler Informationen und Verfahren zu seiner Herstellung
WO1998025268A1 (fr) * 1996-12-05 1998-06-11 Omd Devices Llc Memoire optique fluorescente

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6632890B1 (en) 1999-03-19 2003-10-14 Dow Global Technologies Inc. Hydrogenated block copolymer compositions
US6451924B1 (en) 1999-06-11 2002-09-17 Dow Global Technologies Inc. Hydrogenated block copolymers and optical media discs produced therefrom
US6350820B1 (en) 1999-06-11 2002-02-26 The Dow Chemical Company Hydrogenated block copolymers and optical media discs produced therefrom
US7082093B1 (en) 1999-07-15 2006-07-25 D Data Inc. Optical data storage system having combined fluorescent three-dimensional information carrier
WO2001006501A3 (fr) * 1999-07-15 2001-05-25 Trid Store Ip L L C Systeme de stockage de donnees optiques comportant un support d'information tridimensionnel fluorescent combine
WO2001006505A1 (fr) * 1999-07-15 2001-01-25 Trid Store Ip, L.L.C. Disque optique fluorescent multicouche avec materiau fluorescent photosensible
US7406027B2 (en) 1999-07-15 2008-07-29 D Data Inc. Optical data storage system having combined fluorescent three-dimensional information carrier
US6376621B1 (en) 1999-08-16 2002-04-23 The Dow Chemical Company Hydrogenated block copolymers and optical media discs produced therefrom
US6429260B1 (en) 2000-05-31 2002-08-06 The Dow Chemical Company Olefinic polymer compositions
WO2002003386A3 (fr) * 2000-06-30 2002-05-30 Verification Technologies Inc Procede et appareil destines a controler l'acces a un support de stockage
US7124944B2 (en) 2000-06-30 2006-10-24 Verification Technologies, Inc. Product packaging including digital data
US7303803B2 (en) 2000-06-30 2007-12-04 Verification Technologies, Inc. Copy-protected optical media and method of manufacture thereof
US7486790B1 (en) 2000-06-30 2009-02-03 Verification Technologies, Inc. Method and apparatus for controlling access to storage media
WO2005004130A1 (fr) * 2003-07-03 2005-01-13 Koninklijke Philips Electronics N.V. Support de stockage multicouche de donnees optiques et son utilisation
US9275671B2 (en) 2011-06-09 2016-03-01 Case Western Reserve University Optical information storage medium

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