WO2003070479A1 - Support et procede d'enregistrement optique - Google Patents

Support et procede d'enregistrement optique Download PDF

Info

Publication number
WO2003070479A1
WO2003070479A1 PCT/JP2003/001307 JP0301307W WO03070479A1 WO 2003070479 A1 WO2003070479 A1 WO 2003070479A1 JP 0301307 W JP0301307 W JP 0301307W WO 03070479 A1 WO03070479 A1 WO 03070479A1
Authority
WO
WIPO (PCT)
Prior art keywords
transition metal
recording
optical recording
optical
recording medium
Prior art date
Application number
PCT/JP2003/001307
Other languages
English (en)
Japanese (ja)
Inventor
Akira Kouchiyama
Katsuhisa Aratani
Original Assignee
Sony Corporation
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 Sony Corporation filed Critical Sony Corporation
Publication of WO2003070479A1 publication Critical patent/WO2003070479A1/fr

Links

Classifications

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

Definitions

  • the present invention relates to an optical recording medium using an inorganic material for a recording layer and an optical recording method.
  • CD-R write-once optical recording medium
  • CD-ROM read-only memory
  • CD-Rs have a smaller quantity than conventional CD-ROMs, which record information by transferring pits and projections on the stamper to the substrate by injection molding or other techniques to form pits. Can be copied at a reasonable price and quickly. Because of these advantages, the demand for CD-R is rapidly increasing with the spread of personal computers in recent years.
  • a typical structure of such a write-once optical recording medium is a recording layer made of an organic dye material on a transparent disk-shaped substrate, a reflective layer made of a metal such as gold, and a resin.
  • a protective layer is laminated in this order.
  • the recording of information on the optical disk is performed by irradiating the optical disk with near-infrared laser light (usually a laser light having a wavelength of about 780 nm). This is done by absorbing the light and locally generating and deforming heat, for example, generating pits and the like.
  • near-infrared laser light usually a laser light having a wavelength of about 780 nm.
  • information is usually reproduced by irradiating the optical disc with laser light having the same wavelength as the recording laser light, and the dye recording layer is heated and deformed (recorded part) and undeformed (recorded part). This is done by detecting the difference in reflectance between
  • DVDR write-once DVD
  • This DVD-R is usually prepared by preparing two disks in which a recording layer composed of an organic dye, a reflective layer, and a protective layer are laminated in this order on a transparent disk-shaped substrate, and these are recorded. This is a structure in which the layers are bonded together with the layers inside, or a structure in which this disk is bonded to a disk-shaped protective substrate having the same shape.
  • the disc-shaped substrate used for DVD-R has a guide groove (pred-loop) for tracking the laser beam irradiated during recording, and the guide groove for the CD-R of 0.74 m to 0.8 zm is provided. It is formed with a narrow groove width of less than half.
  • dye recording layers used in conventional CD-Rs and DVD-Rs are designed to absorb light at the recording wavelength used in conventional systems and deform by heat. It is difficult to obtain a large change in optical characteristics with recording light of 600 nm or less. For this reason, there is a need for the development of a new optical recording medium suitable for a new optical recording method using a recording / reproducing laser having a wavelength of 60 Onm or less, which is different from the conventional one.
  • the recording layer using the conventional dye-based material has a problem that the reflectance is low.
  • the present invention has been proposed to solve such a conventional problem.
  • information can be recorded and reproduced by light having a wavelength of 60 O nm or less, and good recording and reproduction can be performed.
  • An object is to provide an optical recording medium having characteristics.
  • Another object of the present invention is to provide an optical recording method capable of recording information at a higher density. Disclosure of the invention
  • the optical recording medium according to the present invention has been completed based on such findings, and has a substrate and a recording layer formed on the substrate, wherein the recording layer is formed of a transition metal. It contains a complete oxide as a recording material.
  • the optical recording method according to the present invention provides recording and reproduction with an optical recording medium having a wavelength of 600 nm or less on an optical recording medium including a substrate and a recording layer containing a transition metal incomplete oxide as a recording material. It is characterized by performing.
  • imperfect oxide of a transition metal refers to a compound that is shifted in a direction in which the oxygen content is smaller than the stoichiometric composition corresponding to the possible valence of the transition metal, that is, the imperfect transition metal oxide
  • a compound whose oxygen content is smaller than the oxygen content of a stoichiometric composition corresponding to the possible valence of the transition metal is defined.
  • transition metal atom having a crystal structure When multiple types of transition metals are included, it is considered that one type of transition metal atom having a crystal structure is partially replaced by another type of transition metal atom. It is determined whether or not the oxide is incomplete depending on whether the oxygen content is insufficient for the stoichiometric composition.
  • the incomplete oxide of the transition metal used in the recording layer of the optical recording medium of the present invention shows absorption for light having a wavelength of 600 nm or less, and is irradiated with light having a wavelength of 600 nm or less as recording light. Thereby, a change in the optical constant and a change in Z or shape can be obtained such that the difference in reflectance between the recorded portion and the unrecorded portion is sufficient.
  • the incomplete oxide of the transition metal is a material having a higher reflectivity for light having a wavelength of 600 nm or less than the organic dye material, and enables more sensitive reproduction.
  • FIG. 1 is a photograph of an optical disc using an incomplete oxide of W as a recording material, observed by SEM. BEST MODE FOR CARRYING OUT THE INVENTION
  • An optical disc to which the present invention is applied basically has a substrate and a recording layer formed on the substrate.
  • the recording layer of the present invention contains an incomplete oxide of a transition metal as a recording material.
  • an incomplete oxide of a transition metal is a compound shifted in a direction in which the oxygen content is smaller than the stoichiometric composition corresponding to the possible valence of the transition metal, that is, the incomplete oxide of the transition metal.
  • a compound whose oxygen content is smaller than the oxygen content of the stoichiometric composition corresponding to the possible valence of the transition metal is defined.
  • transition metals can form oxides having different valences with one element.In this case, however, the stoichiometric composition corresponding to the possible valences of the transition metal causes the actual oxygen content to change. The case where the amount is insufficient is within the scope of the present invention.
  • the above-mentioned trivalent oxide (Mo3) is the most stable, but in addition, monovalent oxide (Mo3) 6
  • incomplete oxides of transition metals exhibit metallic luster in an unrecorded state, and have a wavelength of 600 nm or less. It shows absorption for light, that is, it shows high reflectance.
  • the imperfect oxide of the transition metal undergoes a change in the optical constant and a change in Z or shape when irradiated with recording light of a predetermined power having a wavelength of 600 nm or less. descend. In other words, the reflectance decreases at the recording portion, and the recording becomes apparently transparent.
  • the incomplete oxide of the transition metal can be used, for example, as a write-once optical recording material.
  • the incomplete oxide of the transition metal has a clear boundary between the recorded portion and the unrecorded portion due to the small size of the molecule.
  • transition metals include Ti, V, Cr, Mn, Fe, Nb, Cu, Ni, Co, Mo, Ta, W, Zr, Ru, Ag And the like.
  • Mo, W, Cr, Fe, and Nb are preferably used, and Mo and W are particularly used from the viewpoint that the optical change due to irradiation with light having a wavelength of 600 nm or less is large. Is preferred.
  • Incomplete oxides of transition metals include, in addition to incomplete oxides of one type of transition metal, those added with a second transition metal, those added with multiple types of transition metals, and those other than transition metals Any of the elements to which other elements are added are included in the scope of the present invention.
  • At least one of the above-mentioned transition metals, A 1 and the like can be used. In this case, it is considered that a part of one transition metal atom in the crystal structure is partially replaced by another transition metal atom. Whether or not it is an incomplete oxide will be determined based on whether or not the content is insufficient.
  • the crystal grains of the incomplete oxide of the transition metal become small, so that the boundary between the recorded portion and the unrecorded portion becomes clearer. More specifically, noise characteristics are improved by adding the above elements to the transition metal incomplete oxide at 10 atomic% or more, and good reproduction signals can be obtained by adding 20 atomic% or more. Can be. However, if the proportion of the added element in the incomplete oxide of the transition metal is too high, the optical change amount becomes small, so that a sufficient SN ratio as a recording medium cannot be obtained, and the modulation degree cannot be obtained. Disadvantages occur. Therefore, the ratio is preferably 50 atomic% or less.
  • a conventionally known material used for an ordinary optical recording medium can be used, and for example, plastics such as a polystyrene resin, an acrylic polymer, and glass are preferable.
  • the degree of oxidation of the incomplete oxide of the transition metal can be controlled by changing the oxygen gas concentration in the vacuum atmosphere.
  • sputtering multiple substrates can be obtained by constantly rotating the substrate on different types of sputtering targets. Mix transition metals of different types. The mixing ratio is controlled by changing the input power of each sputter.
  • a target composed of an incomplete oxide of a transition metal containing a desired amount of oxygen in advance is used.
  • a recording layer made of an incomplete oxide of a transition metal can be similarly formed.
  • a recording layer made of an incomplete oxide of a transition metal can be easily formed by a vapor deposition method other than the sputtering method.
  • the recording layer uses an incomplete oxide of a transition metal as a recording material. Irradiation forms a pit (recorded portion), causing a difference in optical characteristics between the pit and the unrecorded portion.
  • the optical disk on which the pits are recorded is irradiated with reproduction light having a wavelength of 600 nm or less
  • the pits, which are the recording portions transmit the reproduction light and exhibit a low reflectance
  • the pits, which are the recording portions exhibit low reflectance. Since the original optical properties of imperfect oxides of transition metals are maintained, A sufficient reflectance is obtained. By detecting the difference in the light reflectance, the information signal can be reproduced.
  • the optical recording medium using the incomplete oxide of the transition metal for the recording layer can use short-wavelength light having a wavelength of 600 nm or less for recording and reproduction, and has excellent recording and reproduction characteristics. Is obtained. Therefore, it is possible to provide a new optical recording method for achieving higher density recording.
  • the present invention is not particularly limited to a detailed structure as long as the optical recording medium includes a substrate and a recording layer.
  • a substrate, a recording layer, and a protective layer may be provided in this order, and a reflective layer for supplementing reflectance may be provided on the recording layer.
  • an intermediate layer for adjusting recording / reproducing characteristics may be added to the upper surface and the Z or lower surface of the recording layer.
  • a disc having at least two substrates and a recording layer may be bonded to each other to form a two-layer structure, a structure in which this disc is bonded to a disk-shaped protective substrate having the same shape, or a multilayer structure. Is also possible.
  • the present invention is not limited to a structure in which recording and reproduction are performed by irradiating a laser beam from the substrate side, and a structure in which a thin protective layer formed on a recording layer is used as a light transmitting layer may be used.
  • An optical disk was actually manufactured in order to confirm the effects of the present invention, and recording and reproduction were performed.
  • an optical disk was obtained by uniformly forming a recording layer made of an incomplete oxide of W on a sufficiently smoothed optical disk substrate by a sputtering method.
  • sputtering was performed in a mixed atmosphere of argon and oxygen using a sputtering target consisting of a simple substance of W, and the oxygen gas concentration was changed to remove incomplete oxides of W.
  • the degree of oxidation was controlled.
  • the obtained optical disk was set in an optical disk recording / reproducing apparatus using a GaN laser diode having a wavelength of 405 nm as a light source, and the irradiation power was higher than that which caused an irreversible change in the recording layer.
  • the recording light was irradiated to form a pit.
  • pits of different sizes were formed by changing the recording power or pulse width of the recording light.
  • a clear pit pattern was formed as shown in Fig. 1.
  • the width and length of the pit after recording varied with the power and pulse width of the recording light source. For example, a short and narrow pit can be formed by lowering the recording power. More specifically, the pit formed in the leftmost column in Fig. 1 has a width and length of 0.25 m, both of which are smaller than the pit width of a conventional optical disk. It becomes fine.
  • an incomplete oxide of a transition metal as a recording material, recording and reproduction can be performed with light having a wavelength of 600 nm or less, and good recording and reproduction can be performed.
  • An optical recording medium having characteristics can be provided.
  • optical recording medium of the present invention by using the optical recording medium of the present invention, light having a short wavelength of 600 nm or less can be used for recording and reproduction, and good recording and reproduction characteristics can be obtained. It is possible to provide a new optical recording method for realizing density recording.

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

L'invention concerne un support d'enregistrement optique sur lequel des informations peuvent être enregistrées ou à partir duquel des informations peuvent être reproduites à l'aide d'une lumière de longueur d'onde inférieure ou égale à 600 nm. Le support présente d'excellentes caractéristiques d'enregistrement et de reproduction. Il comprend une couche d'enregistrement formée sur un substrat, la couche d'enregistrement contenant un matériau d'enregistrement à base d'oxyde de métal de transition. Des informations peuvent être enregistrées sur le support d'enregistrement optique ou reproduites à partir du support d'enregistrement optique à l'aide d'une lumière de longueur d'onde inférieure ou égale à 600 nm. L'invention concerne également un procédé d'enregistrement optique destiné à l'enregistrement d'informations avec une densité supérieure.
PCT/JP2003/001307 2002-02-22 2003-02-07 Support et procede d'enregistrement optique WO2003070479A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002046065A JP2003237242A (ja) 2002-02-22 2002-02-22 光記録媒体及び光記録方法
JP2002-46065 2002-02-22

Publications (1)

Publication Number Publication Date
WO2003070479A1 true WO2003070479A1 (fr) 2003-08-28

Family

ID=27750615

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/001307 WO2003070479A1 (fr) 2002-02-22 2003-02-07 Support et procede d'enregistrement optique

Country Status (3)

Country Link
JP (1) JP2003237242A (fr)
TW (1) TW200401281A (fr)
WO (1) WO2003070479A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1890733B (zh) * 2003-12-01 2011-09-14 索尼株式会社 光盘用母盘的制造方法以及光盘用母盘
US7952984B2 (en) 2004-04-22 2011-05-31 Tdk Corporation Optical recording medium and method of recording and reproducing of optical recording medium
US8124211B2 (en) 2007-03-28 2012-02-28 Ricoh Company, Ltd. Optical recording medium, sputtering target, and method for manufacturing the same
JP2008276900A (ja) 2007-04-02 2008-11-13 Ricoh Co Ltd 追記型光記録媒体

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5262441A (en) * 1975-11-18 1977-05-23 Matsushita Electric Ind Co Ltd Information recording
JPS54133134A (en) * 1978-04-06 1979-10-16 Canon Inc Recording medium
JPS5715148B2 (fr) * 1972-01-31 1982-03-29
JPS59177540A (ja) * 1983-03-29 1984-10-08 Nippon Telegr & Teleph Corp <Ntt> 光学記録材料
JPS59177539A (ja) * 1983-03-29 1984-10-08 Nippon Telegr & Teleph Corp <Ntt> 光学記録用薄膜とその製造方法
JPS60118629A (ja) * 1983-11-30 1985-06-26 Res Dev Corp Of Japan ゲルマニウム−モリブデン系非晶質化合物材料及びその製造法
JPS6180531A (ja) * 1984-09-26 1986-04-24 Fujitsu Ltd 光記録媒体
US5691091A (en) * 1995-06-07 1997-11-25 Syracuse University Optical storage process
WO1999020472A1 (fr) * 1997-10-17 1999-04-29 Kabushiki Kaisha Toyota Chuo Kenkyusho Dispositif a memoire
WO2000004536A1 (fr) * 1998-07-14 2000-01-27 Kabushiki Kaisha Toyota Chuo Kenkyusho Element de memoire
US6045889A (en) * 1997-09-25 2000-04-04 Kabushiki Kaisha Toyota Chuo Kenkyusho Recording medium

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5715148B2 (fr) * 1972-01-31 1982-03-29
JPS5262441A (en) * 1975-11-18 1977-05-23 Matsushita Electric Ind Co Ltd Information recording
JPS54133134A (en) * 1978-04-06 1979-10-16 Canon Inc Recording medium
JPS59177540A (ja) * 1983-03-29 1984-10-08 Nippon Telegr & Teleph Corp <Ntt> 光学記録材料
JPS59177539A (ja) * 1983-03-29 1984-10-08 Nippon Telegr & Teleph Corp <Ntt> 光学記録用薄膜とその製造方法
JPS60118629A (ja) * 1983-11-30 1985-06-26 Res Dev Corp Of Japan ゲルマニウム−モリブデン系非晶質化合物材料及びその製造法
JPS6180531A (ja) * 1984-09-26 1986-04-24 Fujitsu Ltd 光記録媒体
US5691091A (en) * 1995-06-07 1997-11-25 Syracuse University Optical storage process
US6045889A (en) * 1997-09-25 2000-04-04 Kabushiki Kaisha Toyota Chuo Kenkyusho Recording medium
WO1999020472A1 (fr) * 1997-10-17 1999-04-29 Kabushiki Kaisha Toyota Chuo Kenkyusho Dispositif a memoire
WO2000004536A1 (fr) * 1998-07-14 2000-01-27 Kabushiki Kaisha Toyota Chuo Kenkyusho Element de memoire

Also Published As

Publication number Publication date
JP2003237242A (ja) 2003-08-27
TW200401281A (en) 2004-01-16

Similar Documents

Publication Publication Date Title
JP3866016B2 (ja) 光情報媒体およびその再生方法
EP1215669B1 (fr) Support d&#39;enregistrement d&#39;informations optiques, son procédé de fabrication, et procédé et appareil d&#39;enregistrement d&#39;informations sur celui-ci
KR100770808B1 (ko) 광기록매체, 이의 제조방법, 광기록매체 상에 데이터를기록하는 방법 및 데이터 재생방법
KR100734641B1 (ko) 광기록매체, 광기록/재생장치, 광기록장치 및 광재생장치,광기록매체용 데이터 기록/재생 방법 및 데이터 기록방법및 데이터 재생 방법
KR100685061B1 (ko) 광기록매체 및 이를 제조하기 위한 방법, 및 광기록매체상에 데이터를 기록하기 위한 방법 및 광기록매체로부터데이터를 재생하는 방법
US20060245339A1 (en) Optical recording medium and process for producing the same, and data recording method and data reproducing method for optical recording medium
KR100770806B1 (ko) 광기록매체와 그 제조방법 및 광기록매체에 대한 데이터기록방법 및 데이터 재생방법
TWI356413B (en) Recordable optical recording medium and recording
KR100770807B1 (ko) 광기록매체 및 이를 제조하는 방법, 광기록매체에 대한데이터기록방법 및 데이터재생방법
JP2002133712A (ja) 光学的情報記録媒体とその製造方法、記録再生方法及び記録再生装置
JPWO2004032130A1 (ja) 光学的情報記録媒体とその製造方法
JP2006281751A (ja) 追記型光記録媒体
WO2003070479A1 (fr) Support et procede d&#39;enregistrement optique
CN100412971C (zh) 一次性写入光记录介质
JP3752177B2 (ja) 追記型光学的情報記録媒体、その製造方法
JP2005022409A (ja) 光学情報記録媒体とその製造方法
JPWO2008053792A1 (ja) 情報記録媒体、その製造方法および情報記録媒体を形成するためのスパッタリングターゲット
JPH04298389A (ja) 光記録媒体およびその製造方法
JP2010097682A (ja) 光メディア用スパッタリングターゲット、その製造方法、ならびに、光メディア、およびその製造方法
WO2007061021A1 (fr) Support d’enregistrement optique enregistrable son et procédé de fabrication
JP2004284018A (ja) 光記録媒体
JP4412273B2 (ja) 光記録媒体およびその製造方法
TW200841337A (en) Optical information recording medium
JP2006294249A (ja) 光情報媒体
JP2948899B2 (ja) 光記録媒体および光記録方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT SE SI SK TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase