WO2004055797A1 - Support memoire pour le stockage optique et la restitution d'information - Google Patents

Support memoire pour le stockage optique et la restitution d'information Download PDF

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Publication number
WO2004055797A1
WO2004055797A1 PCT/IB2003/005264 IB0305264W WO2004055797A1 WO 2004055797 A1 WO2004055797 A1 WO 2004055797A1 IB 0305264 W IB0305264 W IB 0305264W WO 2004055797 A1 WO2004055797 A1 WO 2004055797A1
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WO
WIPO (PCT)
Prior art keywords
storage medium
optical
layer
ofthe
manufacturing
Prior art date
Application number
PCT/IB2003/005264
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English (en)
Inventor
Christopher Busch
Johannes T. A. Wilderbeek
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to AU2003280089A priority Critical patent/AU2003280089A1/en
Publication of WO2004055797A1 publication Critical patent/WO2004055797A1/fr

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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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers

Definitions

  • the invention relates to a storage medium for the optical storage and retrieval of information.
  • the invention relates to a method of manufacturing a storage medium for the optical storage and retrieval of information and to a record carrier having information written thereon.
  • Inter-pixel or inter-symbol interference is a phenomenon in which intensity at one particular pixel contaminates data at nearby pixels. Physically, this interference arises from the band-limit of the (optical) channel, originating from optical diffraction or from time- varying aberrations in the lens system.
  • a medium for optical storage of the kind mentioned in the opening paragraph for this purpose comprises: a substrate, a pre-determined pattern of bit positions provided with an active layer comprising a recording medium for retention of data, a plurality of micro-optical elements for receiving illumination from an external source of illumination, the micro-optical elements being provided according to the pre-determined pattern of bit positions.
  • An active layer in the present description and claims is understood to be a layer in which information can be stored (coded) and changed.
  • a conventional one-dimensional (optical) storage medium a single bit row is written along a spiral.
  • the track pitch is chosen large enough to reduce thermal cross talk between neighboring tracks to acceptable levels.
  • a recording dye layer is or, alternatively, inorganic phase change layers are distributed homogeneously across the medium.
  • the active layer in the storage medium is patterned beforehand such that recording or storing (coding) information in the recording medium of the active layer is possible only at pre-determined positions and with a certain shape. Because the active layer is not homogeneously distributed across the storage medium but only present at the pre-determined bit positions, (thermal) cross talk between adjacent bit positions is significantly reduced. As a consequence, the density of the bit positions can be increased as compared to the known storage media. When retrieving information from the storage medium, the size of the bit positions can even be smaller than the spot size of the retrieval means.
  • the spot size of the storage means is such that only the active layer at the desired bit position is activated or de-activated and that the adjacent bit positions are (practically) not affected by the storing means.
  • the track density on the storage medium can be significantly improved.
  • the inventors have had the insight to provide above every possible bit position a micro-optical element, for instance a so-called nano-lens, resulting in a significant gain in optical resolution of the storage medium.
  • micro-optical elements nano-optics
  • US patent 5,910,940 describes a storage medium employing an optical layer provided with cylindrical micro-lenses embedded in the storage medium in close proximity of the active layer.
  • the cylindrical micro-lenses stretch along the track direction.
  • the substrate of the storage medium is provided with the predetermined pattern of bit positions.
  • This has the additional advantage that the active layer is provided at the bit positions in the substrate. Patterning the substrate of the storage medium largely facilitates the manufacturing of the storage medium according to the invention.
  • the micro-optical elements comprise lenses (e.g. nano-lenses).
  • each of the possible bit positions in the active layer is provided with an individual lens.
  • the curvature of the lenses is hemispherical or stigmatic.
  • the achieved gain in optical resolution is proportional to the ratio of the refractive index of the lens material as compared to the refractive index of the substrate material.
  • the optical resolution being proportional to the square of the ratio between the respective refractive indexes.
  • a preferred embodiment of the storage medium according to the invention is characterized in that the micro-optical elements are made from a material with a relatively high refractive index and that the micro-optical elements are embedded in a cover layer, the cover layer being made of a material with a relatively low refractive index.
  • the refractive index n c ⁇ of the cover layer is n c ⁇ ⁇ 1.5 and the refractive index n me of the micro-optical elements is n me > 1.5.
  • the refractive index n me of the micro-optical elements is n me > 1.75. High gains in optical resolution are possible by choosing high refractive index materials for the micro-optical elements and/or low index material for the substrate.
  • a preferred embodiment of the storage medium according to the invention is characterized in that the pre-determined pattern comprises a two-dimensional strip of bit positions.
  • the pre-determined pattern comprises a two-dimensional strip of bit positions.
  • a single bit row is written along a spiral employing bit-length encoding as encoding concept.
  • the preferred encoding concept is bit-position encoding.
  • a strip is aligned horizontally and consists of a number of rows and columns.
  • code words do not cross boundaries of a strip.
  • a preferred embodiment of the storage medium according to the invention is characterized in that the pre-determined pattern comprises an at least partial quasi-hexagonal or quasi-square pattern.
  • a quasi-hexagonal or quasi-square pattern is meant a pattern of bit positions that may be ideally arranged hexagonally or square, respectively. However, small position distortions from the ideal pattern may be present. The number of nearest neighbors is six for the hexagonal pattern whereas it is four for a square pattern. The bit error rate is smaller for the quasi-hexagonal and quasi-square pattern as compared to the known storage medium. The higher packing density of the quasi-hexagonal pattern provides a higher storing efficiency than the quasi-square pattern.
  • the quasi-hexagonal or quasi-square patterns are very suitably employed in a storage medium comprising a two-dimensional strip of bit positions.
  • the invention has for its further object to provide a method of manufacturing a storage medium for the optical storage and retrieval of information providing alignment of the micro-optical elements with the pre-determined pattern of bit positions.
  • a method of manufacturing a storage medium for the optical storage and retrieval of information comprises the following steps. An optical layer is deposited into cavities of a pressing tool, the pressing tool being provided with a pre-determined pattern of cavities. As a next step, the pressing tool is positioned in an unprintable layer disposed on a substrate, the unprintable layer comprising a recording medium. Subsequently, the imprintable layer is fixated, providing the substrate with bits of recording medium, the bits being arranged according to the pre-determined pattern. As a next step, the optical layer in the cavities of the pressing tool is released and the pressing tool is removed. Eventually, the optical layer is fixated, forming a micro-optical element on each of the bits of recording medium.
  • the method of manufacturing a storage medium according to the invention provides a storage medium provided with a pre-determined pattern of bits of recording medium and a lens at the location of each of the bits of recording medium. Elaborate positioning aligning the location where the lenses are to be deposited with respect to the location of the bits of recording medium is avoided.
  • the pressing tool which already contains the optical layer for each of the bits, provides the imprintable layer comprising the recording material with the same pre-determined pattern of bit positions.
  • the lens material is provided at the same locations as the recording material.
  • the method according to the invention is efficient, low-cost and high-yield and is very well suited for manufacturing.
  • the micro-optical elements comprise lenses.
  • the curvature of the lenses is hemispherical or stigmatic.
  • a favorable embodiment of the method of manufacturing a storage medium according to the invention is characterized in that the optical layer is released from the cavities by melting the optical layer. The optical layer is retained in the cavities of the pressing tool during the providing of the substrate with the pre-determined pattern of bits with recording material. The optical layer is readily then released from the pressing tool by increasing the temperature of the pressing tool above the melting temperature of the optical layer.
  • the optical layer has a transition point above the transition point of the imprintable layer. This enables the retention of the optical layer in the pressing tool while the substrate is provided with the pre-determined pattern of bits with recording material.
  • the optical layer has a transition point above the ambient temperature.
  • a preferred embodiment of the method of manufacturing a storage medium according to the invention is characterized in that the imprintable layer is a liquid. This facilitates the patterning of the substrate with the pre-determined pattern of bits with recording material.
  • the temperature of the substrate is preferably such that the imprintable layer at that temperature, which may be above (or below) ambient temperature, is in a liquefied state whereas the melting temperature of the optical layer is above that temperature.
  • a favorable manner of fixating the pre-determined pattern of bits of recording material is by means of solidification.
  • the storage medium according to the invention can be a record carrier having information written thereon, e.g. an optical disc, a CD, a CD-Rom, a CD-R, a CD-RW, and a DND, BD, optical memory cards, and similar products.
  • a record carrier having information written thereon is coded in a recording medium provided by a method of manufacturing as described in this patent application.
  • the record carrier is an optical disc.
  • Fig. 1 A shows a storage medium for optical storage and retrieval of information according to the invention
  • Fig. IB shows a detail of the storage medium of Figure 1 A;
  • Fig. 2 shows the optical spot and bit pattern geometry of the pattern of bit positions of Figure IB;
  • Fig. 3 A shows a side view of an embodiment of the storage medium according to the invention
  • Fig. 3B shows a side view of an alternative embodiment of the storage medium according to the invention
  • Figs. 4A-4F show steps of the method of manufacturing a storage medium according to the invention.
  • Fig. 5 shows an alternative embodiment of the pressing tool used in the method of manufacturing a storage medium according to the invention.
  • Figure 1 A shows very schematically a storing medium for optical storage and retrieval of information according to the invention.
  • a substrate 1 is provided by a strip or track in the form of a spiral of bit positions.
  • the spiral is followed by the storage or retrieval means, respectively.
  • Figure IB shows very schematically a detail of the storing medium of Figure 1 A.
  • a pre-determined pattern 4 of bit positions 14, 14', ... is shown.
  • So-called guard bands 3 are shown between the strips or tracks of bit positions 14, 14', ...; the direction in which information is stored and retrieved from a strip of bit positions 14, 14', ... is indicated by a bold arrow.
  • the pattern of bit positions is a quasi-hexagonal pattern for which the number of nearest neighbors is six.
  • the pattern of bit positions is a quasi-square pattern for which the number of nearest neighbors is four.
  • hexagonal patterns provide the highest packing fraction.
  • the packing fraction for the hexagonal pattern is approximately 15% higher than that of a square pattern with the same distance between nearest-neighbor bit positions.
  • other patterns can be employed.
  • Periodic two-dimensional patterns can be built up using triangles with arbitrary angles as basic building blocks.
  • patterns with parallelograms and hexagons can be used.
  • the micro-optical elements are shown in Figures 3 A, 3B, 4D, 4E and 4F.
  • Figure 2 shows the optical spot and bit pattern geometry of the pattern of bit positions of Figure IB.
  • bit positions 14, 14', ... are indicated (by the dashed lines) in the pre-determined pattern 4 as well as an optical spot 5.
  • an active layer 2, 2', ... comprising a recording medium for retention of data is provided with the pre-determined pattern 4 of bit positions 14, 14', ....
  • the active layer 2, 2', ... is provided only at the location of the bit positions 14, 14', .... It becomes clear from the geometry of the optical spot 5 and the bit pattern that cross-talk between neighboring bits is an important issue. For retrieving information from the storage medium, cross-talk can be resolved by adequate coding and signal processing techniques.
  • cross-talk can, by way of example, be avoided by tuning (the intensity of) the optical spot 5 such that upon storing in the active layer at the central bit position the information in the active layers at the nearest neighbor bit positions is not substantially effected.
  • An effective way to reduce the effect of cross-talk is achieved by effectively shielding the active layer 2 at a bit position 14 from the active layer 2' at an adjacent bit position 14' .
  • the[0] active layer is a recoding dye layer (typical for a WORM medium).
  • these layers are deposited by conventional techniques such as spin coating, embossing, molding, (photo)lithography, micro-contact printing or vapor deposition.
  • Organic dye layers can be easily patterned.
  • inorganic phase change layers may also be used as re-writable medium.
  • the latter layers are deposited by sputtering. Patterning organic dyes is preferred as compared to patterning re- writable rare earth recording layers.
  • the storage medium is provided in the substrate 1 beforehand such that storing information is possible only at the pre-determined position and with a pre- determined shape. In this manner, a storage medium with a relatively high data density is obtained.
  • a pressing tool is employed to generate the pre-determined pattern 4 of bit positions 14, 14', .... In this manner the possible bit positions are known exactly beforehand.
  • the pressing tool imprints the pre-determined bit position structure as shown in Figure IB in the form of a spiral as shown in Figure 1 A in a single print step.
  • the pattern of bit positions 4 is embossed in the pressing tool.
  • the scaled distance d c * between centers of the bit positions 14, 14', ... is less than 0.84, preferably less than 0.63.
  • the scaled distance d c is a dimensionless distance.
  • ⁇ /2NA is the so-called MTF cut-off, ⁇ being the wavelength of (laser) light in nm and NA being the numerical aperture of the system.
  • the scaled distance d a ⁇ * between the active layer at a first bit position and the active layer at an adjacent bit position is less than 0.42, preferably less than 0.3.
  • the scaled distance d a ⁇ is a dimensionless distance.
  • the distance d a ⁇ (see Figure 2) is scaled to the effective optical resolution of the system, i.e.
  • dai* d a , / ( ⁇ /2NA).
  • the preferred encoding concept is bit-position encoding.
  • Reliable readout at such a high packing density of the information bits is only possible by the synchronized detection and processing of signals from several bit- rows. This can e.g. be done by using an array of light spots that simultaneously detects (or writes) the two-dimensional (2D) encoded information, thereby dramatically increasing the data rate.
  • the large signal energy present in inter- symbol interference (which in standard optical recording largely is considered as part of the noise) can be coherently used in the reconstruction of the original 2D bit patterns.
  • So-called two-dimensional coding enhances the speed of data coding and decoding.
  • the location of the active layer at the pre-determined bit positions is known to a high accuracy beforehand.
  • Figure 3 A shows a side view of an embodiment of the storage medium according to the invention.
  • the micro-optical elements comprise hemispherical lenses.
  • the storage medium is covered by a transparent cover layer 18 made of a material with a relatively low refractive index, and the optical layer 22, 22', ... has a relatively high refractive index.
  • the refractive index n c ⁇ of the cover layer 18 is n s ⁇ 1.5 and the refractive index n om of the optical layer is n om ⁇ 1.5.
  • the refractive index n om of the optical layer is n om > 1.75.
  • the achieved gain in optical resolution is proportional to the ratio of the refractive index of the lens material as compared to the refractive index of the cover layer material.
  • Figure 3B shows a side view of an embodiment of the storage medium according to the invention, h the example of Figure 3B, the micro-optical elements comprise stigmatic lenses, giving even higher optical resolutions than with the hemispherical lenses, the optical resolution being proportional to the square of the ratio between the respective refractive indexes.
  • Figure 4A-4F show steps of the method of manufacturing a storage medium according to the invention.
  • Figure 4A shows diagrammatically a pressing tool 10 provided with a pre-determined pattern 4 of cavities 11, 11', .... In each of the cavities 11, 11', ... of the pressing tool 10 an optical layer 22, 22', ... is deposited.
  • the pressing tool 10 is lowered (direction of movement indicated by the arrow) in an imprintable layer 13 disposed on a substrate 1 (situation depicted in Figure 4C).
  • the imprintable layer 13 comprises a recording medium. Suitable recording media are layers or patterned layers of organic nature (e.g. organic dyes) or of inorganic nature (e.g. phase change materials).
  • the imprintable layer is a liquid (solution).
  • the temperature of the substrate is such that the imprintable layer at that temperature is in a liquefied state.
  • the imprintable layer 13 is fixated.
  • the imprintable layer 13 is fixated by means of drying. During drying the pressing tool 10 is kept in position. The fixation results in the substrate 1 being provided with (discrete) bits 12, 12', ... of the recording medium.
  • the bits 12, 12', ... are arranged according to the pre-determined pattern 4.
  • the lateral positioning of the bits 12, 12', ... comprising the recording medium is determined by the position and the lateral size of the cavities 11 , 11 ' , ... in the pressing tool 10.
  • the optical layer 22, 22', ... in the cavities 11, 11', ... ofthe pressing tool 10 is released and the pressing tool 10 is removed, as shown in Figure 4D.
  • the optical layer 22, 22', ... is released from the cavities 11, 11', ... by melting the optical layer 22, 22', ....
  • the optical layer 22, 22', ... has a transition point (melting point) above the transition point ofthe imprintable layer 13 and/or a transition point above the ambient temperature.
  • the release of the optical layer 22, 22', ... results in the deposition of a liquid droplet 23, 23', ... on the bits 12, 12', ... comprising the recording medium. In this manner, the droplets 23, 23', ... and the bits 12, 12', ... are arranged according to the pre-determined pattern 4.
  • the droplets 23, 23', ... of the optical layer 22, 22', ... are fixated, forming a micro-optical element 24, 24', ... on each ofthe bits 12, 12', ... ofthe recording medium.
  • a favorable manner of fixating the droplets 23, 23', ... is by means of drying.
  • the micro-optical elements 24, 24', ... comprise lenses.
  • the lenses are hemispherical lenses (see Figure 3 A) or stigmatic lenses (see Figure 3B).
  • the structured layer forming the storage medium obtained by the above described method of manufacturing is optionally covered by a transparent cover layer 18.
  • the transparent cover layer 18 is made from a material with a relatively low refractive index.
  • the pressing tools used for the manufacturing process as described here are obtained by standard methods commonly used for the preparation of stamps for micro- contact printing.
  • a soft polydimethylsiloxane (PDMS) stamp is cast from a preformed mold.
  • PDMS polydimethylsiloxane
  • a transparent high refractive index material is used for the micro- optical element (nano-lenses).
  • nano-lenses For a hemispherical and in particular for a stigmatic lens layout substantial de- wetting, i.e. high contact angles, ofthe optical layer on the recording medium is preferred.
  • the layout is fixated.
  • the optical layer material is pre-deposited in the pressing tool 10.
  • this is done by immersion, optionally in combination with sonification, degassing, vapor deposition, spin coating with or without the aid of applied pressure (e.g. centrifugal force), ofthe, preferably, apolar, hydrophobic stamp (PDMS) in the, preferably, polar, hydrophilic liquid optical layer or lens precursor material.
  • the optical layer material is dissolved in a moderately apolar solvent which still dissolves the optical layer material and has sufficient interaction with the pressing tool to allow the filling of the cavities.
  • Fixation ofthe optical layer material in the pressing tool is, preferably, realized by a phase change, e.g. solidification. This enables the release ofthe optical layer material at a later stage by heating the stamp to a temperature exceeding the transition point ofthe optical layer material, but still below the transition point ofthe recording medium, and below transitions of the material used for the pressing tool.
  • Organic based, high refractive index (n om ⁇ l -7) materials have a predominant apolar character, which is of disadvantage with respect to the required contact angle on the recording material, which has generally also a predominant a-polar character.
  • the polarity ofthe optical layer material can be adjusted by employing suitable co-monomers, or by introduction of suitable polar substituents, without affecting the refractive index ofthe resulting copolymer to a considerable degree.
  • resulting polymers from optical layer material (monomer) are, preferably, transparent at the wavelength used during reading and writing of information.
  • Favorable materials are amorphous polymers.
  • semi- crystalline polymers are suitable also provided the size and distribution ofthe crystallites is small enough to exclude scattering effects.
  • the filling ofthe optical layer material in the cavities occurs at a certain ratio with respect to the groove depth (see Figure 4A).
  • the ratio after solidification depends on several parameters, such as the contact angle between the optical layer material (pure or in solution) and the pressing tool, the temperature during deposition and the cooling rate after deposition, the evaporation and diffusion rate of any optionally used solvent, the depth and width ofthe cavities, etc.
  • a filling ratio less than 1 is preferred, thereby enabling a wet embossing process at a later stage.
  • the pressing tool is lowered into the liquid imprintable layer on the substrate, the imprintable layer containing the recording medium either in its pure form or in solution.
  • the recording medium can be of organic nature (e.g. organic dye), but also of inorganic nature (e.g. inorganic nanoparticles, optionally stabilized).
  • the technique of wet (or liquid) embossing the recording medium is forced into the remaining cavities ofthe pressing tool (see Figure 4B).
  • this step can be performed in a vacuum, to eliminate air inside the cavities preventing the liquid containing the recording medium from entering the cavities ofthe pressing tool.
  • the solvent is, preferably, chosen such that it is a non-solvent for both the optical layer material and the used pressing tool.
  • Polar solvents are best suited for the specific example described here, e.g. acetone, acetonitril, ⁇ -butyrolactone, lower alcohols, etc.
  • the optical layer i.e. the lens precursor material
  • the optical layer is fixated ( Figure 4E) using for instance radiation (e.g. UN-light, visible light) or thermal energy (e.g. thermally initiated polymerization at a curing temperature between the melting temperature ofthe optical layer material and that of the recording medium).
  • radiation e.g. UN-light, visible light
  • thermal energy e.g. thermally initiated polymerization at a curing temperature between the melting temperature ofthe optical layer material and that of the recording medium.
  • Photo-initiators, photo-sensitizers and/or thermal initiators, along with other additives (e.g. inhibitors, stabilizers, nucleating agents (so-called clarifying agents)) can be added to the optical layer material before enclosure in the pressing tool.
  • the nano-lens morphology manufactured according to the method according to the invention is, optionally, covered with a transparent cover layer consisting of a low refractive index material (n ⁇ 1.3) (see Figure 4F).
  • n ⁇ 1.3 refractive index material
  • (amorphous) fiuorinated polymers are employed.
  • the above-described method is an example for recording mediums with an apolar character.
  • polar, hydrophilic recording materials and apolar, hydrophobic optical layer materials or the use of high refractive index (stabilized) organic or inorganic particles (e.g. nano-particles, quantum dots, nano-rods, nano-tubes, nano-wires) or metal complexes are also feasible.
  • high refractive index (stabilized) organic or inorganic particles e.g. nano-particles, quantum dots, nano-rods, nano-tubes, nano-wires
  • metal complexes e.g. nano-particles, quantum dots, nano-rods, nano-tubes, nano-wires
  • different materials for the pressing tool can be used, such as polyurethane stamps, enabling a wider choice of appropriate recording media, optical layer materials and intermediate solvents.
  • the of the pressing tool 10 are provided with a channel 15, 15', ... for influencing the release ofthe optical layer 22, 22 ' , ... from the cavities 11, 11', ....
  • One or more small channels 15, 15', ..., e.g. capillaries are provided in each ofthe cavities ofthe pressing tool.
  • the design can be realized in a simple fashion by appropriate adjustment ofthe mold used for preparing the pressing tool.
  • the capillaries can be injected in the finished pressing tool when still inside the mould or during the formation ofthe pressing tool (curing ofthe monomer used for the fo ⁇ nation ofthe pressing tool) by inserting a second mould on top ofthe first mould.
  • the modification ofthe pressing tool as shown in Figure 5 offers the possibility to adjust the external pressure such that entering (depositing) ofthe liquefied optical layer material in the cavities (under reduced pressure) and releasing (expelling) the optical layer material from the cavities is largely facilitated (under excess pressure).
  • the modified pressing tool also offers an additional means of control ofthe filling ratio ofthe optical layer material.
  • a two-dimensional strip of bit positions 14, 14', ... in the form of a spiral is provided on the substrate by the method of manufacturing a storage medium (see Figure 1A and IB).

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

La présente invention concerne un support mémoire pour le stockage et la restitution d'information. Il comprend un substrat (1), un dispositif défini à l'avance (4) de positions binaires (14, 14', ...) pourvues d'une couche active (2, 2', ...) comprenant un milieu d'enregistrement pour la conservation de données, et une pluralité de micro-éléments optiques (24, 24', ...) permettant de recevoir un influx lumineux d'une source de lumière extérieure. Les micro-éléments optiques sont répartis selon le même dispositif que les positions binaires. Ces micro-éléments optiques comprennent, de préférence, des lentilles de préférence hémisphériques ou stigmatiques. L'invention concerne également un procédé de fabrication du support mémoire. Selon l'invention, le support mémoire se distingue par une densité de données relativement élevée.
PCT/IB2003/005264 2002-12-18 2003-11-18 Support memoire pour le stockage optique et la restitution d'information WO2004055797A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003280089A AU2003280089A1 (en) 2002-12-18 2003-11-18 Storage medium for the optical storage and retrieval of information

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NL1022204 2002-12-18
NL1022204 2002-12-18

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WO1991011804A1 (fr) * 1990-01-31 1991-08-08 Dyno Particles A.S Support de donnees et procedes d'enregistrement et de lecture de donnees
WO1997001171A1 (fr) * 1995-06-23 1997-01-09 Opticom A/S Support de memoire optique et procedes d'ecriture et de lecture
WO1997004448A1 (fr) * 1995-07-18 1997-02-06 Opticom A.S Procede d'ecriture et de lecture en parallele de donnees dans une memoire optique, dispositif d'ecriture/lecture utilisant ce procede et utilisation du procede et du dispositif d'ecriture/lecture
WO1997033275A1 (fr) * 1996-03-07 1997-09-12 Opticom A/S Procede et dispositif de stockage optique des donnees
WO1999026240A1 (fr) * 1997-11-18 1999-05-27 Polaroid Corporation Systemes et supports d'enregistrement optique dotes d'une optique en champ proche integree
US6064615A (en) * 1995-12-28 2000-05-16 Thin Film Electronics Asa Optical memory element
WO2001062400A2 (fr) * 2000-02-24 2001-08-30 The Regents Of The University Of California Fabrication a precision elevee de microstructures polymeriques diverses au moyen de l'effet hydrophobe

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991011804A1 (fr) * 1990-01-31 1991-08-08 Dyno Particles A.S Support de donnees et procedes d'enregistrement et de lecture de donnees
WO1997001171A1 (fr) * 1995-06-23 1997-01-09 Opticom A/S Support de memoire optique et procedes d'ecriture et de lecture
WO1997004448A1 (fr) * 1995-07-18 1997-02-06 Opticom A.S Procede d'ecriture et de lecture en parallele de donnees dans une memoire optique, dispositif d'ecriture/lecture utilisant ce procede et utilisation du procede et du dispositif d'ecriture/lecture
US6064615A (en) * 1995-12-28 2000-05-16 Thin Film Electronics Asa Optical memory element
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