FR2770324B1 - Procede et dispositif de fermeture de la boucle de focalisation d'un lecteur-enregistreur de disque optique - Google Patents

Procede et dispositif de fermeture de la boucle de focalisation d'un lecteur-enregistreur de disque optique

Info

Publication number
FR2770324B1
FR2770324B1 FR9713561A FR9713561A FR2770324B1 FR 2770324 B1 FR2770324 B1 FR 2770324B1 FR 9713561 A FR9713561 A FR 9713561A FR 9713561 A FR9713561 A FR 9713561A FR 2770324 B1 FR2770324 B1 FR 2770324B1
Authority
FR
France
Prior art keywords
recorder
closing
optical disc
disc drive
focusing loop
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 - Fee Related
Application number
FR9713561A
Other languages
English (en)
Other versions
FR2770324A1 (fr
Inventor
Daniel Bec
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.)
Art Tech Gigadisc ATG
Original Assignee
Art Tech Gigadisc ATG
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 Art Tech Gigadisc ATG filed Critical Art Tech Gigadisc ATG
Priority to FR9713561A priority Critical patent/FR2770324B1/fr
Publication of FR2770324A1 publication Critical patent/FR2770324A1/fr
Application granted granted Critical
Publication of FR2770324B1 publication Critical patent/FR2770324B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G11B7/08—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
    • G11B7/0945—Methods for initialising servos, start-up sequences
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
    • 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
    • G11B7/0908—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 focusing only
FR9713561A 1997-10-29 1997-10-29 Procede et dispositif de fermeture de la boucle de focalisation d'un lecteur-enregistreur de disque optique Expired - Fee Related FR2770324B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9713561A FR2770324B1 (fr) 1997-10-29 1997-10-29 Procede et dispositif de fermeture de la boucle de focalisation d'un lecteur-enregistreur de disque optique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9713561A FR2770324B1 (fr) 1997-10-29 1997-10-29 Procede et dispositif de fermeture de la boucle de focalisation d'un lecteur-enregistreur de disque optique

Publications (2)

Publication Number Publication Date
FR2770324A1 FR2770324A1 (fr) 1999-04-30
FR2770324B1 true FR2770324B1 (fr) 2000-01-28

Family

ID=9512781

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9713561A Expired - Fee Related FR2770324B1 (fr) 1997-10-29 1997-10-29 Procede et dispositif de fermeture de la boucle de focalisation d'un lecteur-enregistreur de disque optique

Country Status (1)

Country Link
FR (1) FR2770324B1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61122934A (ja) * 1984-11-16 1986-06-10 Matsushita Electric Ind Co Ltd 焦点位置制御装置
US4740679A (en) * 1985-02-27 1988-04-26 Olympus Optical Co., Ltd. Disc focus servo-circuit with ordered reference level setting means
US5077719A (en) * 1987-08-28 1991-12-31 Fujitsu Limited Optical disk access system
JPH0434734A (ja) * 1990-05-30 1992-02-05 Olympus Optical Co Ltd フォーカスサーボ異常検出装置
JPH06103533B2 (ja) * 1992-10-21 1994-12-14 インターナショナル・ビジネス・マシーンズ・コーポレイション フォーカス引き込み方法および光ディスク駆動装置
JP3610164B2 (ja) * 1996-05-31 2005-01-12 オリンパス株式会社 光ディスク装置の制御装置

Also Published As

Publication number Publication date
FR2770324A1 (fr) 1999-04-30

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Legal Events

Date Code Title Description
ST Notification of lapse