DE19580491T1 - Methods of recording and playing back high density information - Google Patents

Methods of recording and playing back high density information

Info

Publication number
DE19580491T1
DE19580491T1 DE19580491T DE19580491T DE19580491T1 DE 19580491 T1 DE19580491 T1 DE 19580491T1 DE 19580491 T DE19580491 T DE 19580491T DE 19580491 T DE19580491 T DE 19580491T DE 19580491 T1 DE19580491 T1 DE 19580491T1
Authority
DE
Germany
Prior art keywords
recording
methods
high density
playing back
density information
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.)
Ceased
Application number
DE19580491T
Other languages
German (de)
Inventor
Takeshi Maeda
Hisataka Sugiyama
Hiroyuki Awano
Harukazu Miyamoto
Keikichi Andoo
Kouichirou Wakabayashi
Atsushi Saito
Takeshi Shimano
Junko Ushiyama
Osamu Komoda
Hideki Saga
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority claimed from PCT/JP1995/000542 external-priority patent/WO1995026548A1/en
Publication of DE19580491T1 publication Critical patent/DE19580491T1/en
Ceased 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
    • 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
    • G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
DE19580491T 1994-03-25 1995-03-24 Methods of recording and playing back high density information Ceased DE19580491T1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP5541994 1994-03-25
JP15079594 1994-07-01
PCT/JP1995/000542 WO1995026548A1 (en) 1994-03-25 1995-03-24 High density information recording and reproducing method

Publications (1)

Publication Number Publication Date
DE19580491T1 true DE19580491T1 (en) 1996-05-09

Family

ID=26396309

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19580491T Ceased DE19580491T1 (en) 1994-03-25 1995-03-24 Methods of recording and playing back high density information

Country Status (3)

Country Link
KR (1) KR100317766B1 (en)
CN (1) CN1124595C (en)
DE (1) DE19580491T1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005004122A1 (en) * 2003-07-03 2005-01-13 Koninklijke Philips Electronics N.V. Method and apparatus for reading and recording information on a rewritable record carrier

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2909770A1 (en) * 1978-03-16 1979-09-20 Philips Nv RECORDING CARRIERS AND RECORDING CARRIERS FOR OPTICAL DATA AND DEVICE FOR WRITING AND READING THE SAME
DE4006275A1 (en) * 1989-02-28 1990-09-13 Asahi Optical Co Ltd OBJECTIVE LENS SYSTEM OF RECORD / PLAY DEVICE FOR OPTICAL INFORMATION
US5093822A (en) * 1989-06-07 1992-03-03 Hitachi, Ltd. High-density magnetic recording and optical reproducing apparatus
JPH05250679A (en) * 1992-01-09 1993-09-28 Sanyo Electric Co Ltd Reproducing method and reproducing device for optical recording medium
US5410531A (en) * 1991-03-28 1995-04-25 Sanyo Electric Co., Ltd. Noise reduction in a multiplex recorded optical information system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2909770A1 (en) * 1978-03-16 1979-09-20 Philips Nv RECORDING CARRIERS AND RECORDING CARRIERS FOR OPTICAL DATA AND DEVICE FOR WRITING AND READING THE SAME
DE4006275A1 (en) * 1989-02-28 1990-09-13 Asahi Optical Co Ltd OBJECTIVE LENS SYSTEM OF RECORD / PLAY DEVICE FOR OPTICAL INFORMATION
US5093822A (en) * 1989-06-07 1992-03-03 Hitachi, Ltd. High-density magnetic recording and optical reproducing apparatus
US5410531A (en) * 1991-03-28 1995-04-25 Sanyo Electric Co., Ltd. Noise reduction in a multiplex recorded optical information system
JPH05250679A (en) * 1992-01-09 1993-09-28 Sanyo Electric Co Ltd Reproducing method and reproducing device for optical recording medium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Philips: Optical Components, Replicated optics, Product spezification, Sept. 1994 *

Also Published As

Publication number Publication date
CN1128078A (en) 1996-07-31
KR100317766B1 (en) 2002-04-24
CN1124595C (en) 2003-10-15
KR960702660A (en) 1996-04-27

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
8131 Rejection