FR2217770B1 - - Google Patents

Info

Publication number
FR2217770B1
FR2217770B1 FR7404460A FR7404460A FR2217770B1 FR 2217770 B1 FR2217770 B1 FR 2217770B1 FR 7404460 A FR7404460 A FR 7404460A FR 7404460 A FR7404460 A FR 7404460A FR 2217770 B1 FR2217770 B1 FR 2217770B1
Authority
FR
France
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
FR7404460A
Other versions
FR2217770A1 (fr
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
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2217770A1 publication Critical patent/FR2217770A1/fr
Application granted granted Critical
Publication of FR2217770B1 publication Critical patent/FR2217770B1/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
    • G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • G11B7/0903—Multi-beam tracking systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/06—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using magneto-optical elements
FR7404460A 1973-02-12 1974-02-11 Expired FR2217770B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7301929A NL7301929A (fr) 1973-02-12 1973-02-12

Publications (2)

Publication Number Publication Date
FR2217770A1 FR2217770A1 (fr) 1974-09-06
FR2217770B1 true FR2217770B1 (fr) 1981-09-04

Family

ID=19818183

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7404460A Expired FR2217770B1 (fr) 1973-02-12 1974-02-11

Country Status (9)

Country Link
US (1) US3899780A (fr)
JP (1) JPS5444180B2 (fr)
BE (1) BE810857A (fr)
CA (1) CA1017056A (fr)
DE (1) DE2403093A1 (fr)
FR (1) FR2217770B1 (fr)
GB (1) GB1450966A (fr)
NL (1) NL7301929A (fr)
SE (1) SE397599B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0061892B1 (fr) * 1981-03-26 1988-06-22 Sony Corporation Méthode d'enregistrement thermomagnétique
DE3483671D1 (de) * 1983-03-31 1991-01-10 Sony Corp Thermomagnetisches optisches aufzeichnungsverfahren.
US4558383A (en) * 1983-06-30 1985-12-10 International Business Machines Corporation Information storage disk transducer position control system using a prerecorded servo pattern requiring no alignment with the storage disk
US4893910A (en) * 1988-03-16 1990-01-16 Hewlett-Packard Company Magneto-optical recording system having medium with domainless control layer
US5208706A (en) * 1988-10-24 1993-05-04 Lemelson Jerome H Magnetic reproduction apparatus and method
US6118632A (en) * 1997-02-12 2000-09-12 International Business Machines Corporation Magnetic disk stack having laser-bump identifiers on magnetic disks
US6278419B1 (en) 1997-06-26 2001-08-21 Light Spin Ltd. Moving display

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631415A (en) * 1969-09-12 1971-12-28 Honeywell Inc Optical mass memory
US3742471A (en) * 1971-02-24 1973-06-26 Hitachi Ltd Bubble domain apparatus
US3731290A (en) * 1971-07-15 1973-05-01 Honeywell Inc Optical mass memory
US3810131A (en) * 1972-07-18 1974-05-07 Bell Telephone Labor Inc Devices employing the interaction of laser light with magnetic domains

Also Published As

Publication number Publication date
FR2217770A1 (fr) 1974-09-06
GB1450966A (en) 1976-09-29
JPS49114330A (fr) 1974-10-31
CA1017056A (en) 1977-09-06
JPS5444180B2 (fr) 1979-12-24
DE2403093A1 (de) 1974-08-15
NL7301929A (fr) 1974-08-14
US3899780A (en) 1975-08-12
BE810857A (fr) 1974-08-12
SE397599B (sv) 1977-11-07

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Legal Events

Date Code Title Description
ST Notification of lapse