KR900016955A - 정보기록 매체 - Google Patents

정보기록 매체 Download PDF

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KR900016955A
KR900016955A KR1019900005334A KR900005334A KR900016955A KR 900016955 A KR900016955 A KR 900016955A KR 1019900005334 A KR1019900005334 A KR 1019900005334A KR 900005334 A KR900005334 A KR 900005334A KR 900016955 A KR900016955 A KR 900016955A
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South Korea
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atomic
aluminum alloy
layer
metal layer
hafnium
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KR1019900005334A
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기요다까 신도
고이찌 이가라시
구니히꼬 미즈모또
히데히꼬 하시모또
Original Assignee
다께바야시 쇼오고
미쓰이 세끼유 가가꾸 고오교오 가부시끼가이샤
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Publication of KR900016955A publication Critical patent/KR900016955A/ko

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
    • G11B5/66—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several 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
    • 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
    • G11B2007/24304—Metals or metalloids group 2 or 12 elements (e.g. Be, Ca, Mg, Zn, Cd)
    • G—PHYSICS
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    • 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
    • G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
    • G—PHYSICS
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    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • 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
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    • 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
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    • 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
    • G11B7/253—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
    • G11B7/2534—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 polycarbonates [PC]
    • 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
    • G11B7/2538—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 polycycloolefins [PCO]
    • 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
    • G11B7/2578—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
    • 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
    • G11B7/2585—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 based on aluminium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9265—Special properties
    • Y10S428/928—Magnetic property
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • Y10T428/12743—Next to refractory [Group IVB, VB, or VIB] metal-base component

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  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Holo Graphy (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

내용 없음

Description

정보기록 매체
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명의 일실시예에 의한 정보기록매체의 개략 단면도.
제2도는 본 발명의 다른 실시예에 의한 정보기록매체의 개략단면도.

Claims (10)

  1. 기판상에 기록층과 금속층을 갖으며, 상기 금속층이 하프늄 및 니오븀중에서 선택한 1이상의 원소를 함유하는 알루미늄합금으로 구성되어 있고. 상기 원소의 함량은 알루미늄합금층을 구성하는 총원자에 대해 0. 1∼10원자%인 것을 특징으로 하는 정보기록매체.
  2. 기판상에 기록층과 금속층을 갖으며, 상기 금속충이 알루미늄합금으로 구성되어 있고, 상기 알루미늄합금은 알루미늄 합금층을 구성하는 총원자에 대해 하프늄 0. 1∼9.5원자%, 크로뮴 0. 1∼5원자%를 함유하고 있으며 상기 하프뮴과 크로뮴의 합계함량은 10원자%미만인 것을 특징으로 하는 정보기록매체.
  3. 기판상에 기록층과 금속층을 갖으며, 상기 금속층이 알루미늄합금으로구성되어 있고, 상기 알루미늄합금은 알루미늄합금층을 구성 하는 총원자에 대해 하프늄 0.1∼9.5원자%, 크로뮴 0. 1∼5원자%, 티타늄 0.1-9.5원자%를 함유하고 있으며, 상기 하프툼, 크로뮴 및 티타늄의 합계함량은 10원자%미만인 것을 특징으로 하는 정보기록 매체.
  4. 기판상에 기록층과 금속층을 갖으며, 상기 금속층이 알루미늄합금으로 구성되어 있고, 상기 알루미 늄합금은 알루미늄합금층을 구성하는 총원자에 대해 하프늄0.5-5원자%, 티타늄0.5-5원자%를 함유하고 있으며, 상기 하프늄과 티타늄의 합게함량은 1∼5. 5원자%인 것을 특징으로 하는 정보기록매체.
  5. 기판상에 기록층과 금속층을 갖으며, 상기 금속층이 알루미능합금으로 구성 되어 있고, 상기 알루미늄합금은 알루미늄합금층을 구성하는 총원자에 대해 하프늄 0.1-10원자%. 마그네슘 0.1~9.5원자%를 함유하고 있으며, 상기 하프늄, 마그네슘및 티타늄의 합계함량은 15원자%미만인 것을 특징으로 하는 정보기록매체.
  6. 기판상에 기록층과금속층을 갖으며, 상기 금속층이 알루미늄합금으로 구성되어 있고, 상기 알루미늄합금은 알루미늄합금층을 구성하는 총원자에 대해 하프늄 0. 1-10원자%, 마그네슘 0. 1∼10원자%, 티타늄 0. 1-10원자%를 함유하고 있으며, 상기 하프눔, 마그네슘 및 티타늄의 합계함랑은 15원자%미만인 것을 특징으로 하는 정보기록 매체.
  7. 기판상에 기록층과 금속층을 갖으며, 상기 금속층이 알루미늄 합금으로 구성되어 있고, 상기 알루미늄합금은 알루미늄합금층을 구성하는 총원자에 대해 하프늄 0. 1-10원자%, 크로뮴 10원자%이하, 마그네슘 0. 1-10원자%를 함유하고 있으며, 상기 하프늄, 크로뮴 및 마그네슘의 합계함량은 15원자%미만인 것을 특징으로 하는 정보기록 매체.
  8. 기판상에 기록층과 금속층을 갖으며, 상기 금속층이 알루미늄합금으로구성되어 있고, 상기 알루미늄합금은 알루미늄합금층을 구성하는 총원자에 대해 하프늄0. 1∼10원자%, 마그네슘 1-10원자%, 티타늄 0. 1-10원자% 및 크롬뮴 10원자%미만을 함유하고 있으며, 상기 하프늄, 마그네슘 및 크로뮴의 합계함량은 15원자%미만 인것을 특징으로 하는 정보기록매체.
  9. 제1항∼10항중 어느 한항에서, 상기 기록층이 광자기기록층인 정보기록매체.
  10. 제1항∼8항중 어느 한항에서, 상기 금속층의 두께가 100∼5,000A 인 정보기록 매체.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019900005334A 1989-04-17 1990-04-17 정보기록 매체 KR900016955A (ko)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP1-97206 1989-04-17
JP9720689 1989-04-17
JP1-129554 1989-05-23
JP12955389 1989-05-23
JP12955489 1989-05-23
JP1-129553 1989-05-23
JP15753289 1989-06-20
JP1-157532 1989-06-20

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KR900016955A true KR900016955A (ko) 1990-11-14

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KR1019900005334A KR900016955A (ko) 1989-04-17 1990-04-17 정보기록 매체

Country Status (8)

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US (1) US5032470A (ko)
EP (1) EP0393576B1 (ko)
KR (1) KR900016955A (ko)
AT (1) ATE141436T1 (ko)
CS (1) CS190990A2 (ko)
DE (1) DE69028032T2 (ko)
PL (1) PL284812A1 (ko)
RU (1) RU1835086C (ko)

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
DE3880642T2 (de) * 1987-12-08 1993-11-18 Mitsui Petrochemical Ind Zusammensetzung , mit aktiven Strahlen härtbar, und Medium für die optische Registrierung mit dieser gehärteten Zusammensetzung.
CA2017226A1 (en) * 1989-05-23 1990-11-23 Kiyotaka Shindo Information recording media
US5500301A (en) * 1991-03-07 1996-03-19 Kabushiki Kaisha Kobe Seiko Sho A1 alloy films and melting A1 alloy sputtering targets for depositing A1 alloy films
EP0541376B1 (en) * 1991-11-07 1998-06-03 Toray Industries, Inc. Optical recording medium
US5948497A (en) * 1992-10-19 1999-09-07 Eastman Kodak Company High stability silver based alloy reflectors for use in a writable compact disk
US5972461A (en) * 1998-01-06 1999-10-26 Imation Corp. Rewritable optical data storage disk having enhanced flatness
US6238763B1 (en) 1998-01-06 2001-05-29 Imation Corp. Rewritable optical data storage disk having enhanced flatness
JP4193185B2 (ja) * 2006-07-12 2008-12-10 独立行政法人産業技術総合研究所 無色透明にできる反射型調光薄膜材料

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5720933A (en) * 1980-07-14 1982-02-03 Toshiba Corp Information recording carrier
NL8102283A (nl) * 1981-05-11 1982-12-01 Philips Nv Optisch uitleesbare informatieschijf met een reflectielaag gevormd uit een metaallegering.
DE3425578A1 (de) * 1984-07-11 1986-01-16 Polygram Gmbh, 2000 Hamburg Optisch auslesbarer plattenfoermiger informationstraeger hoher speicherdichte
JPS61156550A (ja) * 1984-12-27 1986-07-16 Matsushita Electric Ind Co Ltd 光熱磁気記録担体
JPS6267750A (ja) * 1985-09-19 1987-03-27 Sumitomo Metal Mining Co Ltd 光磁気デイスク
JPH0719396B2 (ja) * 1985-12-09 1995-03-06 ソニー株式会社 情報記録媒体
JPS62172545A (ja) * 1986-01-23 1987-07-29 Hitachi Maxell Ltd 光磁気記録媒体
JPS62177721A (ja) * 1986-01-31 1987-08-04 Nec Corp 磁気記録体
US4740430A (en) * 1987-02-18 1988-04-26 American Telephone And Telegraph Company, At&T Bell Laboratories Magneto-optic memory

Also Published As

Publication number Publication date
PL284812A1 (en) 1991-02-25
EP0393576B1 (en) 1996-08-14
DE69028032D1 (de) 1996-09-19
ATE141436T1 (de) 1996-08-15
CS190990A2 (en) 1991-09-15
RU1835086C (ru) 1993-08-15
EP0393576A3 (en) 1991-12-18
EP0393576A2 (en) 1990-10-24
DE69028032T2 (de) 1997-01-23
US5032470A (en) 1991-07-16

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