WO2007020541A2 - Support d'enregistrement optique - Google Patents

Support d'enregistrement optique Download PDF

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Publication number
WO2007020541A2
WO2007020541A2 PCT/IB2006/052557 IB2006052557W WO2007020541A2 WO 2007020541 A2 WO2007020541 A2 WO 2007020541A2 IB 2006052557 W IB2006052557 W IB 2006052557W WO 2007020541 A2 WO2007020541 A2 WO 2007020541A2
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WO
WIPO (PCT)
Prior art keywords
optical recording
recording medium
layer
smoothing filter
filter layer
Prior art date
Application number
PCT/IB2006/052557
Other languages
English (en)
Other versions
WO2007020541A3 (fr
Inventor
Coen A. Verschuren
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.
Publication of WO2007020541A2 publication Critical patent/WO2007020541A2/fr
Publication of WO2007020541A3 publication Critical patent/WO2007020541A3/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
    • 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
    • G11B7/254—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 protective topcoat layers
    • G11B7/2542—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 protective topcoat layers consisting essentially of organic resins
    • G11B7/2545—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 protective topcoat layers consisting essentially of organic resins containing inorganic fillers, e.g. particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
    • 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
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated 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
    • G11B7/24056—Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs
    • G11B7/24059—Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs specially adapted for near-field recording or reproduction
    • 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
    • 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
    • G11B2007/25706—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 transition metal elements (Zn, Fe, Co, Ni, Pt)
    • 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
    • G11B2007/2571—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 14 elements except carbon (Si, Ge, Sn, Pb)
    • 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
    • G11B7/241—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
    • G11B2007/25715—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 oxygen
    • 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
    • G11B2007/25716—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 sulfur

Definitions

  • the invention relates to optical recording media, specifically optical recording media designed for use in near field optical drives and comprising a cover layer comprising nanoscale particles, and a data layer for storage of recorded information.
  • the invention further relates to the quality of the light spot used to read from, and write to, an optical disc.
  • the maximum data density which can be recorded on an optical, recording medium or disc in an optical recording system inversely scales with the size of the laser spot that is focused on to the disc.
  • NA number of an objective lens in air or through a plane parallel plate (such as a flat disc) is unity.
  • the NA of a lens can exceed unity if the light is focused in a material of high refractive index without refraction at the air-medium interface.
  • SIL Solid Immersion Lens
  • a higher NA permits higher storage density of data on a disc but also requires that the SIL lens be positioned very close to the optical disc during operation, in the region of 25-40nm.
  • SPIE Optical Data Storage 2004
  • the associated technique is often referred to as near field recording.
  • Media used in conjunction with a system for near field recording include first- surface media, where the data are written directly onto the disc surface (reference Jpn. J. Appl. Phys.; special issue ISOM2004, Vol. 44, No. 5B (2005), pp. 3564-3567), and media comprising a cover layer which creates a protection for the data (reference Jpn. J. Appl. Phys.; special issue ISOM2004, Vol. 44, No. 5B (2005), pp. 3554-3558).
  • a cover layer should have a refractive index larger than the NA of the optical recording system to allow marginal rays of light to propagate to the data layer.
  • the thickness of the cover layer is usually between 1 and 3 microns. Such a thickness, however, excludes the use of high refractive index materials such as ZnS-SiO 2 and SiN, due to technical difficulties, as these are deposited by a sputtering process. (These materials are sometimes found in media stacks in very thin layers, e.g. 30-40nm thickness for SiN, where they are used to tune contrast and reflectivity in first surface recording, and to act as physical barriers between more volatile components of the media stack layers).
  • Spin coatable and preferably UV curable materials need to be used for the cover layer but such materials often have a refractive index of only 1.6, which would limit the effective NA of the recording system to around 1.5.
  • hybrid polymer coatings A class of polymer-based materials was developed to allow a higher refractive index of the cover layer. These materials may be referred to as hybrid polymer coatings. An example of this technology is found in Proceedings of SPIE 2005, Vol. 5724, Hybrid high refractive index polymer coatings, Yubao Wang et al. In general, hybrid coatings are formed by combination of a relatively low refractive index polymer with nanoscale particles of high refractive index. Examples of nanoscale particles are particles of size around IOnm and made OfTiO 2 , which have a refractive index of 2.3 at a light wavelength of 405nm. The nanoscale particles are sub wavelength in size.
  • Optical recording devices read data from optical recording media by means of light.
  • a light beam is generated and focused to a spot, which is then incident on the recording media, directed to the position of the data layer.
  • the quality of the light spot determines the quality of the read signal returned for detection.
  • a known problem with the hybrid polymer coating is that light will be scattered by the nanoscale particles leading to a deterioration of the spot quality.
  • the optical recording medium further comprises a smoothing filter layer, positioned between the cover layer and the data layer such that the smoothing filter layer is adjacent to the data layer, the smoothing filter layer arranged to average distortions of a spot of light transmitted through the smoothing filter layer.
  • adjacent is taken to include 'immediately adjacent to' and also to include 'in close proximity to' the data layer.
  • Imaging of the nanoscale particles does not occur as the particles are sized at less than 1/10 of the light wavelength but scattering of the light by the particles disrupts the carefully controlled properties of the light spot. This problem is especially difficult near the position of spot focus.
  • the presence of the smoothing filter layer restores the quality of the spot.
  • the smoothing filter layer has a refractive index at least equal to the refractive index of the cover layer. This allows the most optimum coupling between the layers as the higher NA is sustained throughout the media stack. Thus marginal rays of light can propagate and reading of high-density data is achieved.
  • the smoothing filter layer has isotropic optical properties. The layer should be very transparent with negligible adsorption at read/write wavelength. Absorption in the order of a few percent for the total layer may be acceptable, but adsorption should, preferably, be as low as possible.
  • Examples of well-known dielectric materials which conform to requirements, include, but are not limited to, ZnS- SiO 2 , SiN, and SiO x N y .
  • Other materials are in the classes of oxides, nitrides or oxy-nitrides, e.g. InSnO x , AlN, AlO x N y , Ta 2 O 5 , TaO x N y , HiO x N y .
  • the smoothing filter layer has a thickness of 100 to 200nm.
  • a thicker layer is advantageous. Due to manufacturing issues and cost issues, however, 100 to 200nm are a practical upper limit for current materials. In this thickness range, the layer is not subject to the internal stresses, which degrade layer performance and make manufacture difficult for thicker layers.
  • the required thickness of the smoothing filter layer becomes smaller for larger NA and for smaller nanoscale particle size. Put another way, performance becomes better for a given thickness of smoothing filter layer if nanoscale particle size in the cover layer is reduced or the recording system uses a higher NA.
  • the cover layer comprises a polymer material formed of a mixture of polymer and nanoscale particles.
  • the invention relates to any cover layer containing nanoscale particles.
  • the normal hybrid cover layer on media is a mixture of a lower refractive index polymer and higher refractive index nanoscale particles, in order to accommodate the higher NA of the recording system.
  • the invention and development are particularly suited to such a system and such media.
  • the nanoscale particles comprise particles of TiO 2 . These particles have a refractive index of 2.3 at a wavelength of 405nm, and are suitable for use with higher NA lenses of the recording system.
  • the optical recording medium comprises a plurality of data layers, each data layer having an associated smoothing filter layer arranged immediately adjacent to that data layer.
  • the advantage of high NA recording is the higher data density, which can be placed on a single data layer.
  • an optical recording medium is not limited to a single data layer but may contain two or more data layers to increase the data-carrying capacity of the optical recording medium.
  • the invention can be applied to each layer, resulting in a pairing of a data layer with an associated smoothing filter layer to provide smoothing of the read/write spot for each layer equally.
  • the smoothing layer on the optical recording medium can be utilized for an optical recording medium, used in cooperation with an optical device for recording data or reading data, such that the data may be present on the optical recording medium data layer at higher densities than would be possible if the smoothing layer was not present.
  • the invention further leads to a method of high NA optical reading using optical recording medium comprising steps of:
  • Figure 2 shows a schematic drawing of conventional cover layer optical recording media and an optical recording medium according to the invention.
  • Figure 3 shows a schematic drawing of conventional dual layer cover layer protected optical recording media and dual layer optical recording media according to the invention.
  • Figure 4 illustrates the concept of two methods associated with the invention.
  • Figure 1 Three types of prior art objective lens assemblies are shown schematically in Figure 1.
  • Figure l(a) shows the objective lens 11 of a standard optical recording system (not shown).
  • the objective lens 11 is used to focus a light beam 14 onto an optical recording medium (not shown) in order to read or write data.
  • the light beam 14 is focused in air, which has a refractive index of 1.
  • Figure l(b) shows the optical path incorporating a solid immersion lens (SIL) of hemispherical shape 12.
  • This SIL 12 has a radius of R, as shown in the figure.
  • the material of the SIL lens has refractive index n greater than 1, and thereby the effective NA of the objective lens is increased by a factor n.
  • a higher system NA permits reading and writing of data to an optical recording medium at higher density, thereby increasing the storage capacity of the medium.
  • Figure l(c) shows the optical path incorporating a solid immersion lens (SIL) of super hemispherical shape 13.
  • SIL solid immersion lens
  • optical recording systems are to increase the system NA, for example by means shown above, to permit more and more data to be stored on a data layer of an optical recording medium.
  • Such media should cooperate with the increased system NA by allowing the complete bundle of light coming from the optical system to be coupled into the optical recording media.
  • the optical recording media must have a high refractive index.
  • a protective cover layer is desirable to protect data layers, and this should also have a high refractive index.
  • the protective cover layer according to prior art, which solves the requirement of high refractive index material for the cover layer, is one, which incorporates sub wavelength nanoscale particles of very high refractive index.
  • These particles are mixed with a lower refractive index polymer, which when used alone might not provide a sufficient light coupling for the higher NA optical recording systems, but which has good properties for ease of recording medium manufacture.
  • a combination of particulates and polymer provides the required optical properties for high NA use but the particulates tend to scatter the light incident on the media.
  • Figure 2(a) shows schematically such optical recording media according to prior art.
  • the media comprises a substrate 21 for mechanical strength, a cover layer 22 to protect data and a data layer 23.
  • the data layer 23 may also be considered to represent a recording stack composed of more than one material.
  • Light from an optical recording system (not shown), formed into a focused beam with a well controlled profile, is incident on the cover layer 22 containing nanoscale particles (not shown).
  • the particles scatter light in such a way as to disrupt the profile of the beam, making it noisier and less smooth. This affects the quality of the part of the beam used to read data from or write data to the optical recording medium, this part of the beam being known as the read/write spot.
  • Figure 2(b) shows the same optical recording media but with an additional smoothing filter layer 24 according to the invention.
  • the smoothing filter layer 24 sits adjacent to the data layer 23 and serves to smooth the spot signal, removing distortions in the beam to restore the quality and effectiveness of the read/write spot function.
  • Figure 3 (a) illustrates optical recording media according to prior art, similar to that shown in Figure 2(a) but here incorporating an additional data layer 31, separated from the original data layer 23 by a spacer layer 32.
  • Optical recording media may comprise one, two or more data layers in order to expand the amount of storage capacity for data, which can be held on one single recording device.
  • the present invention may be applied for devices with multiple data layers by providing a smoothing filter layer for each data layer. This is shown in Figure 3(b) for two data layers in an optical recording medium, where an additional data layer 31 is associated with an additional smoothing filter layer 33.
  • Figure 4 illustrates the concept of two methods associated with the invention. One method is related to recording on an optical recording medium and the other method to reading from an optical recording medium.
  • the first step 41 is the provision on the optical recording medium of a smoothing layer according to any of the aspects of the invention.
  • the second step is the association of the optical recording medium comprising smoothing filter layer with a device for reading from or writing to an optical recording medium, this device having a high NA.
  • a device for reading from or writing to an optical recording medium this device having a high NA.
  • An example of such a device would be a near field optical recording system.
  • Light generated in the device passes though the smoothing layer and the quality of the read/write spot is thereby improved. This allows data to be written more densely on the optical recording medium, due to the higher accuracy of writing, or allows densely packed data to be read more easily and efficiently.
  • SIL super hemispherical solid immersion lens

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

La présente invention concerne un support d'enregistrement optique comprenant une couche de recouvrement souhaitable, en particulier pour l'enregistrement optique sur le terrain, mais les avantages d'ouverture numérique élevés du système peuvent être compromis par des matériaux de couche de recouvrement classique, lorsque l'indice de réfraction de ce matériau est trop faible. On peut utiliser des matériaux à indice de réfraction élevé contenant des particules de taille manométrique pour résoudre ce problème mais un point d'écriture/lecture focalisé peut-être détériorée de manière importante du fait de la diffusion de la lumière par ces particules de taille nanométrique. L'utilisation d'une couche filtre de lissage restaure la qualité de ce point.
PCT/IB2006/052557 2005-08-12 2006-07-26 Support d'enregistrement optique WO2007020541A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05107459.9 2005-08-12
EP05107459 2005-08-12

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Publication Number Publication Date
WO2007020541A2 true WO2007020541A2 (fr) 2007-02-22
WO2007020541A3 WO2007020541A3 (fr) 2007-05-31

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020054974A1 (en) * 2000-05-26 2002-05-09 Tosoh Corporation Surface-side reproducing type optical recording medium
EP1496508A1 (fr) * 2002-04-16 2005-01-12 Sony Corporation Support d'enregistrement optique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020054974A1 (en) * 2000-05-26 2002-05-09 Tosoh Corporation Surface-side reproducing type optical recording medium
EP1496508A1 (fr) * 2002-04-16 2005-01-12 Sony Corporation Support d'enregistrement optique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE INSPEC [Online] THE INSTITUTION OF ELECTRICAL ENGINEERS, STEVENAGE, GB; 2005, YUBAO WANG ET AL: "Hybrid high refractive index polymer coatings" XP002412320 Database accession no. 8925417 cited in the application & ORGANIC PHOTONIC MATERIALS AND DEVICES VII 24 JAN. 2005 SAN JOSE, CA, USA, vol. 5724, no. 1, April 2005 (2005-04), pages 42-49, Proceedings of the SPIE - The International Society for Optical Engineering SPIE-Int. Soc. Opt. Eng USA ISSN: 0277-786X *

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WO2007020541A3 (fr) 2007-05-31

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