EP0145757A1 - Structure d'enregistrement optique impliquant une reaction chimique in situ dans la structure active - Google Patents

Structure d'enregistrement optique impliquant une reaction chimique in situ dans la structure active

Info

Publication number
EP0145757A1
EP0145757A1 EP19840902401 EP84902401A EP0145757A1 EP 0145757 A1 EP0145757 A1 EP 0145757A1 EP 19840902401 EP19840902401 EP 19840902401 EP 84902401 A EP84902401 A EP 84902401A EP 0145757 A1 EP0145757 A1 EP 0145757A1
Authority
EP
European Patent Office
Prior art keywords
optical recording
recording structure
matrix
stratum
absorbing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19840902401
Other languages
German (de)
English (en)
Inventor
Boris J. Muchnik
Franklin D. Kalk
Fred W. Spong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Storage Technology Corp
Original Assignee
Storage Technology Corp
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 Storage Technology Corp filed Critical Storage Technology Corp
Publication of EP0145757A1 publication Critical patent/EP0145757A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24316—Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
    • G11B7/245—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing a polymeric component
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/251—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials dispersed in an organic matrix
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2531—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising glass
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2532—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising metals
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
    • 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
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers

Definitions

  • the present invention relates to the field of high density information storage devices, and in particular to optical media recording structures for use in high density information storage devices.
  • the active layer is selectively perforated or vaporized by a focussed radiation beam, said beam usually provided by a laser.
  • a focussed radiation beam said beam usually provided by a laser.
  • a lower energy read beam having a power level insufficient to write on
  • the medium is focussed onto the active structure of the recording structure so that the changes in reflectivity between the written and unwritten areas modulate the reflected reading beam.
  • Improvements in prior art recording structures have included both the introduction of phase layers as thermal and optical" spacers to maximize the write efficiency and playback contrast, and overcoats for dust defocusing and protection.
  • the energy absorbing active layer has generally been comprised of either a continuous layer of an organic-dye-impregnated polymer, or a continuous layer of a metal or semi-metal.
  • organic dye layers are taught in U.S. Pat. Nos. 4,241,355, issued to Bloom et al. on December 21, 1980,; 4,097,895, issued to Spong on June 27, 1978, and; 4,023,185, issued to Bloom et al. on May 10, 1977.
  • Examples of continuous metal active layers can be found in U.S. Pat. Nos. 3,990,084, issued to Ohta et al. on November 2, 1976, and; 3,474,457, issued to Becker on October 21, 1969.
  • the prior art has generally taught data recording by hole formation via the physical displacement of the active layer.
  • debris is often produced which litters both written and unwritten areas, thereby increasing media noise.
  • the surface tension of the melted material causes the formation of a rim on the perimeter of the hole. The formation of this rim decreases the
  • the prior art has addressed this problem by placing a protective transparent coating over the active layer. This has reduced the amount of debris which could escape to contaminate adjacent areas or coat the objective lens. See e.g., U.S. Pat. Nos. 4,315,269, issued to Bloom et al. on February 9, 1982; 4,300,143, issued to Bell et al. on November 10, 1981, and; 3,990,084, issued to Hamisch et al. on November 2, 1976.
  • the overcoat is an optically transparent layer of silicon dioxide, which in conjunction with the thicknesses of the active and phase layers, is tuned for the wavelength of the laser beam in order to establish an anti-reflection condition.
  • Bell, Hamisch, and Booth all teach having an overcoat layer of material which is chemically unreactive with respect to the active layer.
  • the present invention avoids hole formation and the attendant rim and debris problems of the prior art by the use of chemical reaction between the components of an active layer structure.
  • the prior art has also taught the use of a transparent phase layer between the active layer and the reflecting surface.
  • This phase layer optically tunes the structure such that absorption in the active layer is optimized.
  • the phase layer also thermally isolates the active layer.
  • Bell has taught the use of a dielectric phase layer, that is inert so that it does not react with the active layer, other than to physically capture the ejected debris and to deform to allow the displacement of the heated active layer material. See also the above-mentioned organic dye active layer disclosures wherein more sensitive active layers are taught.
  • the problems described in the prior art became particularly acute when relatively wide bands, are written such as when 4-10 micrometer wide coarse seek bands are written. Writing such wide bands, using the ablative process, results in excessively noisy coarse seek signals due to debris in the coarse seek bands. It is to avoiding specific problems of this nature that the present invention is particularly well suited.
  • the present invention provides a new and unique recording method and structure that addresses the problems discussed above in a novel manner.
  • the present invention discloses the use of a discontinuous layer of a light absorbing material, such as a tellurium alloy, encapsulated between an upper and lower layer of a transparent matrix material, such as a halocarbon polymer, together forming a composite material
  • This active structure can be incorporated into either optically tuned or untuned recording structures.
  • the active structure When the active structure is irradiated by a focussed radiation beam of sufficient intensity, the absorbing material chemically reacts with the matrix material, while some of the absorbing material becomes locally dispersed within the matrix material.
  • the resultant written active structure has different optical properties from the unwritten active structure.
  • tellurium halide is light transmissive, and thereby changes the reflectivity of the irradiated spot relative to that of the surrounding unwritten area.
  • the present invention is distinguished from the prior art in that upon irradiation with the laser beam, a chemical transformation of the active structure materials is accomplished, the transformation changing the optical constants of the irradiated active structure. This makes it unnecessary to physically displace the active structure material in order to alter the reflectivity of the recording structure.
  • the present invention is also distinguished from the prior art wherein continuous layers of active material are taught.
  • the active structure is formed by a discontinuous stratum of light absorbing globules encapsulated in matrix material.
  • the encapsulation of the globules is important to the efficient operation of the disclosed invention in that encapsulated globules present a greater surface-to-volume ratio than a continous film, thereby increasing the rate at which the globule material
  • the protective layer can be deposited onto an active layer after the data is written in the active layer, failed to take into account the advantages of encapsulating globules of light absorbing material in a light transparent matrix that chemically reacts with the globules.
  • complete encapsulation is necessary for the efficient operation of the invention.
  • rim formation causes playback noise problems.
  • rim formation is not an issue because the light absorbing material of the absorbing stratum is not physically displaced out of a pit to pile up on the rim. Rather, the absorbing material reacts essentially in-situ with the matrix material to form a more transparent reaction product. This therefore provides for greater sensitivity and cleaner playback transitions, thus- achieving higher signal-to-noise ratios.
  • lower power levels for writing can be used.
  • the significant reaction product is believed to be an optically semi-transparent compound formed between a strong oxidizer and a metallic or semi-metallic material.
  • the reaction product is a tellurium fluoride.
  • the recording structure is contemplated for use in an optical recording device employing a relatively higher power writing laser beam and a relatively lower power reading laser beam.
  • the recording structure moves relative to the beams.
  • the write and read beams translate radially over the rotating disk, so that data can be recorded in either concentric circles or in a single continuous spiral as desired.
  • Information is recorded by intensity modulating the write beam and directing it onto the recording structure, the beam selectively causing a chemical reaction in the recording structure, and thereby creating a data mark.
  • the recording structure is comprised of an optically smooth and light reflective substrate, or alternatively, separate planarizing and light reflective layers overlying the substrate. Deposited over the reflecting surface is the lower portion of the matrix.
  • the matrix material is selected from the group of halocarbon polymers.
  • the discontinuous absorbing stratum is then deposited over the lower matrix, the absorbing stratum globules being distributed over the lower matrix surface.
  • the absorbing stratum material is selected from a group consisting of low melting point semi-conductors, high melting point semi-conductors, high melting point refractory metals, and common metals.
  • the upper portion of the matrix selected from the same group as the lower matrix, is then deposited over the globules, thereby completely encapsulating the globules in the matrix material. If desired, separate protective and hermetic sealing and dust defocusing overcoats may
  • the absorbing stratum though discontinuous, is deposited in sufficient density so as to create an anti-reflection condition when the matrices and the absorbing stratum are properly tuned to appropriate thicknesses.
  • a lower matrix is deposited using plasma polymerization techniques to a depth of approximately 700 angstroms.
  • the absorbing stratum is deposited to a mass equivalent thickness of approximately 80-100 angstroms. Care was taken to deposit this stratum to a thickness sufficient to establish a relatively high optical extinction index k_, i.e. greater than unity in the stratum, but riot so thick as to establish an essentially connected, continuous layer having bulk electrical and optical properties.
  • the upper matrix is deposited.
  • the upper matrix is deposited to a thickness of approximately 3000 angstroms. Note that in this preferred embodiment both the upper and lower matrix thicknesses are designed for purposes of establishing the ant-i-reflective condition.
  • Recording is achieved by applying the modulated write laser beam to the recording structure, causing the selective reaction between the halocarbon polymer matrix material and the encapsulated absorbing stratum material.
  • the chemical reaction product is more optically transparent than the unreacted absorbing stratum.
  • the read beam is effectively absorbed.
  • the reaction product is present and the stratum is light transmissive the an i-reflective condition is destroyed and the read beam is reflected by the reflecting surface.
  • the modulated read beam is then directed to sensing circuitry which converts the reflection/anti-reflection pattern into an electrical information signal.
  • FIG. 1 is a schematic representation of the preferred embodiment of the basic elements of the disclosed invention, showing a reflective substrate, and an absorbing stratum encapsulated between an upper and a lower matrix, the lower matrix overlying the reflecting surface.
  • FIG. 2 is a schematic representation of the preferred embodiment of the disclosed invention showing an optically more transparent area in the absorbing stratum created by the chemical reaction between the absorbing stratum and the upper and lower matrices.
  • FIGS. 3a, b and c are detailed pictorial representations, serially depicting the encapsulation of the absorbing stratum between the lower and the upper matrices. These drawings more accurately portray, at the sub-microscopic level, the matrix/absorbing-stratum interface, and the complete encapsulation of the discontinuous absorbing stratum globules.
  • FIG. 4a is a detailed pictorial representation of a single globule after complete encapsulation, but prior " to irradiation by a write laser beam.
  • FIG. 4b is a detailed pictorial representation of the same area featured in FIG. 4a, after irradiation by a write laser beam, showing the chemical reaction product.
  • FIG. 5 is a schematic representation of the preferred embodiment of the disclosed invention incorporated into a reflective optical recording structure.
  • FIG. 6 is a schematic representation of an alternative embodiment of the disclosed invention incorporated into a radiation transmissive optical recording structure.
  • an optical recording structure in its basic form, is comprised of an optically smooth reflecting substrate 2 over which is deposited a lower matrix 3, and an upper matrix 4. Encapsulated at the interface 6 between the upper and the lower matrices is an absorbing stratum 5. The matrices 3 and 4, and the absorbing stratum together form the active structure 7.
  • the substrate 2 consists of a support material, such as glass, aluminum, or plastic. It is necessary that the substrate 2 have an optically smooth and reflecting surface.
  • the matrix materials are selected from the group of halocarbon polymers. While the preferred embodiment contemplates both the lower 3 and the upper 4 matrix to be of the same material, it should be understood that both matrices need not be of the same material.
  • the absorbing stratum 5 is selected from a group consisting of low melting point semi-conductors, high melting point semi-conductors, high melting point refractory metals, and common metals. As shown in FIG. 2, upon reaction with the matrices 3 and 4, the absorbing stratum 5 becomes an optically more transparent reaction product 8.
  • a tellurium-rich alloy comprised of tellurium, selenium and arsenic is used. Using well known thin-film deposition techniques, matrices 3 and 4, and the absorbing stratum 5 are deposited in such a relationship as to create an anti-reflection condition.
  • the tellurium-alloy/ fluorocarbon-polymer combination is of particular interest due to the low thermal conductivities of the fluoropolymers and the relatively low melting points of the tellurium alloys. This results in a relatively sharply defined reaction volume because the chemical reaction can occur at a temperature that is low relative to temperatures required for ablative ' processes.
  • the tellurium alloy composition by atomic fraction was 80% tellurium, 19% selenui , and 1% arsenic. This allows for smaller marks and therefore denser data patterns.
  • FIG.2 is a schematic representation of the active structure 7 after irradiation by a write laser beam.
  • the tellurium-alloy absorbing stratum 5 has reacted with the fluorocarbon polymer matrices 3 and 4 to form the tellurium fluoride reaction products 8.
  • These reaction products 8 are optically more transparent, at least at the wavelength of the read laser beam, and form an optical opening 9. This allows a read beam (not shown) to pass through the optical opening 9 to reflect off the reflecting surface 10 of the substrate 2.
  • FIGS. 3a, b and c more accurately present the interface as it appears at the sub-microscopic level.
  • the lower matrix 3 formed from polymers, presents a rather craggy, non-uniform, surface.
  • the discontinuous stratum 5 of a tellurium alloy is deposited on the lower matrix 3 surface.
  • the stratum 5 is deposited in sufficient quantity to establish the anti-reflective condition in cooperation with the matrices 3 and 4.
  • the amount of material for the absorbing stratum 5 that is deposited must be such that deposited globules 11 of the absorbing stratum material remain separate and disconnected so as to form a discontinuous film. If deposition is continued to the point where the absorbing stratum 5 becomes continuous, the effectiveness of the invention is diminished, because the surface-to- volume ratio will be significantly reduced, thereby reducing, the surface available for reaction.
  • FIG. 3c once the upper matrix 4 is deposited, the encapsulation of each globule 11 is complete, thereby completing formation of the active structure 7.
  • FIGS. 4a and 4b a schematic representation of a single encapsulated globule 11 is shown in order to better explain what is believed to be the chemical reaction that occurs.
  • the matrices 3 and 4 consist of a plasma polymerized fluorocarbon, loosely bound fluorine atoms are available, and when a globule 11, consisting of a tellurium alloy is encapsulated, a portion of the tellurium atoms are believed to react spontaneously with the fluorine atoms in the area immediately adjacent to the globule 11. This is believed to form a reaction product shell 8 of tellurium fluoride, and a fluorine-deficient shell 12, which cooperate to inhibit further spontaneous tellurium-fluorine reactions.
  • the active structure 7 which consists of an unreacted tellurium alloy globule 11, a reaction product shell 8 of tellurium fluoride, a fluorine-deficient polymer shell 12, and the unreacted lower and upper matrices 3 and 4.
  • FIG. 4b shows the same area after irradiation by a write laser
  • the reaction product 8 like the surrounding matrices 3 and 4, is light transmissive, at least at the read laser wavelengths. This creates, as shown in FIG. 2, the optical opening 9 through which a read beam can pass to be reflected by the reflecting substrate 2.
  • FIG. 5 shows the disclosed invention 1 incorporated into a fully developed optical structure 13, comprising a support substrate 14; a planarizing layer 15 for providing an optically smooth surface; a reflecting layer 16 overlying the planarizing layer 15; an active structure comprised of lower and upper matrices 3 and 4, having encapsulated therein an absorbing stratum 5; an hermetic sealing layer 17; and a defocusing and protective layer 18.
  • the substrate 14 is of a material which can be made suitably optically smooth and reflective, then the planarizing 15 and reflecting 16 layers may be omitted.
  • the lower matrix 3 can serve as a phase layer to optimize write sensitivity and playback contrast as taught in the prior art.

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

Structure d'enregistrement optique (1) composée d'un substrat (2) réfléchissant la lumière et optiquement lisse, de la partie inférieure d'un matériau de matrice (3) choisi dans le groupe formé par les polymères halogénés, d'une strate discontinue d'un matériau absorbant la lumière (5) choisi dans le groupe composé des semi-conducteurs à point de fusion bas, des semi-conducteurs à point de fusion élevé, des métaux communs et des métaux réfractaires à point de fusion élevé, de la partie supérieure du matériau de matrice (4) choisi dans le même groupe que la matrice inférieure, et, si on le désire, d'une couche d'étanchéité séparée (17) protectrice et hermétique ainsi que d'un revêtement de déréglage de la mise au point par poussière (18). Lors du fonctionnement, la strate de matériau absorbant la lumière (5), bien qu'étant discontinue, possède une densité suffisante pour créer une condition d'anti-réflexion lorsque la strate (5) et les matrices (3 et 4) sont accordées aux épaisseurs appropriées. Après irradiation par rayon laser focalisé d'une puissance suffisante, le matériau de la strate (5) réagit chimiquement avec le matériau de matrice (3 et 4), détruisant l'interface (6) permettant l'existence de la condition d'anti-réflexion, ce qui crée une ouverture optiquement transparente (9) permettant à un rayon de lecture d'être réfléchi par le substrat réfléchissant la lumière (2). Une donnée est ainsi enregistrée dans les modifications subies par la condition de réflexion de la structure d'enregistrement (1).
EP19840902401 1983-05-31 1984-05-30 Structure d'enregistrement optique impliquant une reaction chimique in situ dans la structure active Withdrawn EP0145757A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49966683A 1983-05-31 1983-05-31
US499666 1983-05-31

Publications (1)

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EP0145757A1 true EP0145757A1 (fr) 1985-06-26

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WO1986000744A1 (fr) * 1984-07-06 1986-01-30 Storage Technology Corporation Structure de stockage optique
US4600682A (en) * 1984-07-06 1986-07-15 Storage Technology Corporation Optical storage structure
US4735888A (en) * 1985-02-04 1988-04-05 Kabushiki Kaisha Toshiba Information recording medium and manufacturing method thereof
JPH01196743A (ja) * 1988-02-01 1989-08-08 Toshiba Corp 情報記録媒体

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US4241156A (en) * 1977-10-26 1980-12-23 Xerox Corporation Imaging system of discontinuous layer of migration material
JPS5470041A (en) * 1977-11-15 1979-06-05 Stanley Electric Co Ltd Flexible multilayer xerographic photosensitive member
US4278756A (en) * 1979-07-06 1981-07-14 Drexler Technology Corporation Reflective data storage medium made by silver diffusion transfer
US4312938A (en) * 1979-07-06 1982-01-26 Drexler Technology Corporation Method for making a broadband reflective laser recording and data storage medium with absorptive underlayer
US4269917A (en) * 1979-07-06 1981-05-26 Drexler Technology Corporation Data storage medium having reflective particulate silver layer
US4298684A (en) * 1979-07-06 1981-11-03 Drexler Technology Corporation Reflective data storage medium made by silver diffusion transfer in silver-halide emulsion incorporating nuclei
US4360820A (en) * 1979-10-01 1982-11-23 Omex Laser recording medium
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DE3123608C2 (de) * 1981-06-13 1985-01-10 Standard Elektrik Lorenz Ag, 7000 Stuttgart Elektrofotografisches Aufzeichnungsmaterial

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