CA1241441A - Optically readable storage disc - Google Patents

Optically readable storage disc

Info

Publication number
CA1241441A
CA1241441A CA000473765A CA473765A CA1241441A CA 1241441 A CA1241441 A CA 1241441A CA 000473765 A CA000473765 A CA 000473765A CA 473765 A CA473765 A CA 473765A CA 1241441 A CA1241441 A CA 1241441A
Authority
CA
Canada
Prior art keywords
substrate
cover
balancing
recording layer
storage disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000473765A
Other languages
English (en)
French (fr)
Inventor
Leonardus P.J. Hoogeveen
Hendrikus W.C.M. Peeters
Aloysius M.J.M. Spruijt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Optical Storage International Holland
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 Optical Storage International Holland filed Critical Optical Storage International Holland
Application granted granted Critical
Publication of CA1241441A publication Critical patent/CA1241441A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/24018—Laminated discs
    • G11B7/24021—Laminated discs provided with a special shape or structure for centering or eccentricity prevention, e.g. alignment
    • 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
    • G11B7/24015—Air-sandwiched discs
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/211—Eccentric

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Packaging For Recording Disks (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Optical Recording Or Reproduction (AREA)
CA000473765A 1984-02-14 1985-02-07 Optically readable storage disc Expired CA1241441A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8400477A NL8400477A (nl) 1984-02-14 1984-02-14 Optisch uitleesbare geheugenschijf.
NL8400477 1984-02-14

Publications (1)

Publication Number Publication Date
CA1241441A true CA1241441A (en) 1988-08-30

Family

ID=19843489

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000473765A Expired CA1241441A (en) 1984-02-14 1985-02-07 Optically readable storage disc

Country Status (15)

Country Link
US (1) US4622661A (en])
JP (1) JPS60142833U (en])
KR (1) KR900011241Y1 (en])
BE (1) BE901720A (en])
CA (1) CA1241441A (en])
DD (1) DD232781A5 (en])
DE (1) DE3505014C2 (en])
ES (1) ES8606711A1 (en])
FR (1) FR2559608B1 (en])
GB (1) GB2154362B (en])
HK (1) HK82291A (en])
IT (1) IT1183233B (en])
NL (1) NL8400477A (en])
SG (1) SG50090G (en])
SU (1) SU1438632A3 (en])

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5130870A (en) * 1990-12-21 1992-07-14 Seagate Technology, Inc. Information storage disc balance weight
US6249509B1 (en) * 1994-09-29 2001-06-19 Tdk Corporation Optical device with protective cover
JPH1040578A (ja) * 1996-07-23 1998-02-13 Mitsubishi Chem Corp ディスク用基板
AUPP231598A0 (en) * 1998-03-13 1998-04-09 Mikoh Technology Limited A method of recording information ii
EP0985207A1 (en) * 1997-04-03 2000-03-15 Mikoh Corporation Limited Information recording method
WO1999005672A1 (en) * 1997-07-23 1999-02-04 Seagate Technology, Inc. Disk drive system, process and components thereof for improved disk stiffness
AU749161B2 (en) * 1998-03-13 2002-06-20 Mikoh Technology Limited Method of recording information
KR20000015452A (ko) * 1998-08-29 2000-03-15 윤종용 기울기 및 변위 보정수단을 가지는 광디스크
DE19850302A1 (de) * 1998-10-30 2000-05-04 Thomson Brandt Gmbh Ausgewuchtete Optische Disk
US6424488B1 (en) 1999-02-22 2002-07-23 Seagate Technology Llc Peripherally extending disc ring to limit disc deflection and to provide disc stack balancing
EP1043684A1 (de) * 1999-03-29 2000-10-11 OMD Productions AG Informationsträger
AUPQ132699A0 (en) * 1999-07-01 1999-07-22 Tsun, Ka Ho Compact disc improvements
JP2002251845A (ja) * 2001-02-21 2002-09-06 Internatl Business Mach Corp <Ibm> ディスクドライブ装置、ヘッドアセンブリ、ピボットベアリング
US7227717B1 (en) * 2001-06-18 2007-06-05 Seagate Technology Llc Asymmetric disk surface properties in one head disk drives
TW200832390A (en) * 2007-01-24 2008-08-01 Daxon Technology Inc Optical disc with enforced structure
US8228626B2 (en) 2007-03-20 2012-07-24 Oerlikon Trading Ag, Trubbach Color wheel with individual balancing masses along a guide
DE102007013899B4 (de) * 2007-03-20 2024-07-11 Oerlikon Trading Ag, Trübbach Verfahren zum Auswuchten eines Farbrades mit individuellen Auswuchtmassen entlang einer Führung

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1409568A (en) * 1921-05-10 1922-03-14 Pakeman Harry Record disk for graphophones and method of forming same
FR2180562A1 (en]) * 1972-04-21 1973-11-30 Le Sausse Robert
US3838464A (en) * 1972-10-24 1974-09-24 Nashua Corp Retaining ring for magnetic disc pack assembly
US3854347A (en) * 1973-08-15 1974-12-17 J Hellerich Dynamic balancing device for a computer disc memory
DE2344744C3 (de) * 1973-08-31 1978-06-08 Ullstein Av - Produktions- Und Vertriebsgesellschaft Mbh, 2000 Hamburg Transportschutz für einen plattenförmigen Informationsträger, insbesondere Bild- oder Bild-Ton-Platte
US4074282A (en) * 1976-05-13 1978-02-14 North American Philips Corporation Radiation-sensitive record with protected sensitive surface
DE2624380B1 (de) * 1976-05-31 1977-06-08 Polygram Gmbh Plattenfoermiger informationstraeger
DE2624375C3 (de) * 1976-05-31 1979-01-04 Polygram Gmbh, 2000 Hamburg Plattenförmiger Informationsträger für Bild- bzw. Videosignale
US4313190A (en) * 1979-01-15 1982-01-26 Discovision Associates Method for making a composite video disc
JPS5621835U (en]) * 1979-07-26 1981-02-26
US4300803A (en) * 1979-09-14 1981-11-17 Plumbium Manufacturing Corporation Adhesive vehicle wheel weight and method
JPS5774842A (en) * 1980-10-24 1982-05-11 Mitsubishi Electric Corp Optical information recording disk
JPS5786173A (en) * 1980-11-17 1982-05-29 Toshiba Corp Recorder and reproducer
US4376963A (en) * 1980-12-19 1983-03-15 International Business Machines Corporation Composite magnetic recording disk
JPS647448Y2 (en]) * 1981-01-20 1989-02-28
JPS57172541A (en) * 1981-04-15 1982-10-23 Toshiba Corp Information storage medium
JPS57172542A (en) * 1981-04-15 1982-10-23 Toshiba Corp Information storage medium
US4365258A (en) * 1981-05-18 1982-12-21 Eastman Kodak Company Optical disc unit, fabrication method and cooperating write and/or read apparatus
FR2524186B1 (fr) * 1982-03-23 1989-02-24 Thomson Csf Disque optique protege comprenant un element souple de fermeture
JPS5914176A (ja) * 1982-07-15 1984-01-25 Matsushita Electric Ind Co Ltd 信号記録体
NL8300478A (nl) * 1983-02-09 1984-09-03 Philips Nv Optisch uitleesbare geheugenschijf.

Also Published As

Publication number Publication date
JPH0333939Y2 (en]) 1991-07-18
FR2559608A1 (fr) 1985-08-16
SU1438632A3 (ru) 1988-11-15
ES8606711A1 (es) 1986-04-01
NL8400477A (nl) 1985-09-02
DD232781A5 (de) 1986-02-05
FR2559608B1 (fr) 1988-12-09
KR900011241Y1 (ko) 1990-12-22
GB8503679D0 (en) 1985-03-13
DE3505014A1 (de) 1985-08-14
IT8519459A0 (it) 1985-02-11
DE3505014C2 (de) 1994-11-03
BE901720A (fr) 1985-08-12
ES540287A0 (es) 1986-04-01
KR850009772U (ko) 1985-12-05
GB2154362A (en) 1985-09-04
IT1183233B (it) 1987-10-15
SG50090G (en) 1990-08-31
JPS60142833U (ja) 1985-09-21
GB2154362B (en) 1988-11-02
US4622661A (en) 1986-11-11
HK82291A (en) 1991-11-01

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Legal Events

Date Code Title Description
MKEX Expiry