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
  • 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
  • G11B7/2403—Layers; Shape, structure or physical properties thereof
  • G11B7/24067—Combinations of two or more layers with specific interrelation
• • 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
  • G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
• • 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
  • G11B7/252—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
  • G11B7/257—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
  • G11B2007/25705—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
  • G11B2007/25708—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing group 13 elements (B, Al, Ga)
• • 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
  • G11B7/257—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
  • G11B2007/25705—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
  • G11B2007/25711—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing carbon
• • 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
  • G11B7/257—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
  • G11B2007/25705—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
  • G11B2007/25713—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 layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing nitrogen
• • 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
  • G11B7/2403—Layers; Shape, structure or physical properties thereof
• • 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
  • G11B7/2403—Layers; Shape, structure or physical properties thereof
  • G11B7/24062—Reflective 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
  • G11B7/256—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 layers improving adhesion between 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
  • G11B7/258—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 invention relates to an optical recording medium for making archive records by a laser beam comprising a substrate, recording layer, reflective layer and at least one protective layer.
• Optical recording media for making archive records are subject to extraordinary requirements, specifically preservation of their reproduction properties. Therefore, such media shall withstand non-standard storing environment including high humidity, temperature and even intervention of microorganisms, for a long time. Such requirements may not be mostly met by optical media using as a recording material some type of dyes, for example cyanine-based dyes. The attention is therefore paid to recording materials using metal as a main component of the recording layer the structure of which is modified through irradiation with laser beam . Nevertheless, this approach is accompanied by the necessity to apply more complicated and exacting manufacturing technology, and last but not least, higher production costs.
• US pat. 4,624,914 relates to an optical media the photosensitive recording layer of which consists of composite comprising preferably Pd, O and Te or TeO 2 respectively. This composition enables to increase recording speed and achievement of higher C/N ratio.
• FIG. 2010/0068444 teaches a recording - data - layer comprising preferably Te or alloys or composites thereof including other metals.
• the recording layer is facially contacted by a carbon layer infused with a gas, preferably CO or CO 2 .
• a second carbon layer separated from the first carbon layer by a metal layer or further layers is disclosed. Said layers are disposed between two dielectric layers.
• the recording layer comprises a metal elected from the group consisting of Te, Te alloys and composites, and is disposed between a first and a second metal layer exhibiting reflection properties where the first metal layer separates the recording layer from a protective layer and a lower substrate on the laser beam irradiation side and the second metal layer from a stabilization layer comprising material selected from the group consisting of boron, boron carbide, boron nitride and carbon on the other side, whereby the stabilization layer is whereby the stabilization layer is superposed by at least one adhesive layer and an upper substrate.
• the recording layer comprises the TeSeBi alloy.
• the thickness of the first metal layer is from 3 to 6 nm while the thickness of the second metal layer is from 1 to 2 nm.
• the first and the second metal layer is comprised of Cr, Cr alloys and composites.
• the protective layer is comprised of material selected from the group consisting of SiO 2 and ZnS.
• the stabilization layer is supperposed by a first adhesive layer, an ultraviolet curing adhesive layer, and a second adhesive layer.
• the adhesive layer is comprised of a material selected from the group consisting of Si, Si compounds and carbon.
• the described configuration of the individual layers of the optical recording medium such as optical disc according to the invention enables to obtain reliable archival optical recording medium with a maximum lifetime.
• the optimal composition of individual layers enables to eliminate the influence of heat, humidity and light when making records and influence of other unfavorable factors and conditions during the long-term storing of both recorded and blank information carriers.
• a stabilization layer comprising boron and boron carbides improves high temperature resistance and radiation shielding properties of the optical medium.
• Another advantage of the optical medium according to the invention is that it does not require specific, recording or reproduction hardware or software and may be therefore used on the most conventional currently available recording and reproducing devices without requirements for their extraordinary properties or outputs and energy sources.
• Fig. 1 - is a schematic view showing composition of individual layers of the optical recording medium between the lower and upper substrate.
• the disc 1 comprises on the lower side a lower substrate 11, made of transparent polycarbonate resin. This substrate is designed for entry of a laser beam 1 generated by a recording or reading device.
• the disc is closed by an upper substrate 12 of the same material i.e. made of transparent polycarbonate resin.
• a protective layer 2 called also a dielectric layer, having a total thickness of about 20 nm is stacked.
• the main component of the protective layer is SiO 2 .
• a recording layer 3 situated above the protective layer 2 is inserted between the first and the second metal layer exhibiting reflective properties and comprising as a main component Cr.
• the first metal layer 31 has a thickness of about 4 nm in an appropriate range from 1 to 3 nm. This layer serves also as a stabilization layer for the period before a record in the recording layer 3 has been made.
• the second metal layer 32 has a thickness of about 2 nm in a suitable range of 1 to 3 nm.
• the metal layer may be also composed of other elements such as Ag, Al, Mg, Cu, Pd, Zn and similar known elements.
• the second metal layer 32 has function of an assistance reflector for reading a record.
• the recording layer comprises alloy TeSeBi and its thickness is about 10 nm in a suitable range from 9 to 15 nm.
• Said additional components of a Te alloy may be replaced or further combined with other elements such as Pd, O, Pb, Sn, Al, Cr, Co or a mixture of metals and alloys of such elements.
• the second metal layer 32 is followed by a main stabilization layer 5 having thickness ranging from 7 to 12 nm, preferably 10 nm, the main component of which is boron, boron carbide or boron nitride. In an alternative embodiment, this layer may comprise carbon.
• the external side of the lower substrate 11 may be provided with a transparent ultraviolet (UV) light curable varnish about 6 ⁇ m thick and the external top side of the upper substrate 12 with two layers of white UV curable varnish having a total thickness about 20 - 40 ⁇ m.
• a transparent UV curable varnish may be used instead of the white varnish as well.
• the disc 1 was manufactured by the following method. On a polycarbonate disc 120 mm in diameter representing the lower substrate 11 and provided with a guide groove, the protective layer 2 was first deposited by plasma sputtering process under protective atmosphere in a vacuum chamber. The deposition was effected by means of 3 cathodes each cathode thus forming insputterdeposition process a 6.5 nm thick Si layer using reactive plasma with O 2 up to the total thickness of 20 nm.
• a first 3 nm thick metal layer 31 formed of Cr was formed by sputter deposition process under inert argon atmosphere and then, also under the argon atmosphere, the 10 nm thick recording layer 3 composed of TeSeBi and further followed by a second 2 nm thick metal layer were formed.
• the main 10 nm thick stabilizing layer 5 of boron was formed by reactive plasma with CO 2 .
• carbon was sputtered using also reactive plasma with CO 2 .
• a first SiO 2 adhesive layer 61 was deposited by plasma sputtering process under protective atmosphere and under the same conditions the second adhesive layer 62 was deposited on the lower side of the upper substrate 12.
• Si alone was applied instead SiO 2 with the similar effect.
• lower and upper parts of the disc 1 prepared in the above described manner were glued together by UV cured adhesive by injecting the adhesive between the adhesive layers of both rotating parts of the discs and by curing the joint by an UV lamp.
• Discs produced under this method were provided with records using the hereinafter described DVD + R and BD-4 recording devices and then tested for compliance with the international standards 'ECMA INTERNATIONAL'.
• CATS analyzer usually sold under the designation DEV CATS-SA300 + DVD Pro was used. The tests results obtained by testing on a number of recording and reading devices representing currently available commercial apparatuses are summarized in the following table:
• the test results proved that by producing an optical recording medium with the configuration and composition of individual layers according to the invention, the technical solution of the problems accompanying production of the archive discs with extremely long lifetime was found. Moreover, the results show that the recording medium according to the invention is suitable i.e. recordable and readable on all types of currently available devices without the necessity to use a special equipment designed for this special purpose.
• optical recording medium according to the invention is designed for use by organizations and individuals for the purpose of recording and long-term preserving of information.

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

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• 2010
  • 2010-09-07 CZ CZ20100666A patent/CZ2010666A3/cs not_active IP Right Cessation
• 2011
  • 2011-09-02 WO PCT/IB2011/053856 patent/WO2012032448A1/en active Application Filing
  • 2011-09-02 EP EP11764860.0A patent/EP2614503A1/de not_active Withdrawn
  • 2011-09-02 UA UAA201304191A patent/UA107511C2/uk unknown
  • 2011-09-02 EA EA201390337A patent/EA201390337A1/ru unknown

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