DE69121478D1 - Fokussierungssystem für bewegliche Linse - Google Patents

Fokussierungssystem für bewegliche Linse

Info

Publication number
DE69121478D1
DE69121478D1 DE69121478T DE69121478T DE69121478D1 DE 69121478 D1 DE69121478 D1 DE 69121478D1 DE 69121478 T DE69121478 T DE 69121478T DE 69121478 T DE69121478 T DE 69121478T DE 69121478 D1 DE69121478 D1 DE 69121478D1
Authority
DE
Germany
Prior art keywords
focusing system
moving lens
lens
moving
focusing
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
DE69121478T
Other languages
English (en)
Other versions
DE69121478T2 (de
Inventor
Alan August Fennema
Spencer Donald Roberts
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of DE69121478D1 publication Critical patent/DE69121478D1/de
Application granted granted Critical
Publication of DE69121478T2 publication Critical patent/DE69121478T2/de
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
    • G11B7/085—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
DE69121478T 1990-06-04 1991-05-29 Fokussierungssystem für bewegliche Linse Expired - Fee Related DE69121478T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/533,305 US5128913A (en) 1990-06-04 1990-06-04 Acquiring focus in an optical system using a soft focus acquiring system

Publications (2)

Publication Number Publication Date
DE69121478D1 true DE69121478D1 (de) 1996-09-26
DE69121478T2 DE69121478T2 (de) 1997-02-13

Family

ID=24125378

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69121478T Expired - Fee Related DE69121478T2 (de) 1990-06-04 1991-05-29 Fokussierungssystem für bewegliche Linse

Country Status (4)

Country Link
US (1) US5128913A (de)
EP (1) EP0460859B1 (de)
JP (1) JP2682757B2 (de)
DE (1) DE69121478T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9000780A (nl) * 1990-04-03 1991-11-01 Nederland Ptt Werkwijze en inrichting voor het doorschakelen van dataeenheden.
JP3077771B2 (ja) * 1991-04-09 2000-08-14 ソニー株式会社 フォーカスサーボ装置
DE69322204T2 (de) * 1992-06-08 1999-06-17 Hewlett-Packard Co., Palo Alto, Calif. Bipolares System zur Erzeugung eines auf eine Platte eines Laufwerkes wirkenden Drehmoments zum Lösen festgefahrener Wandlerköpfe

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58101330U (ja) * 1981-12-25 1983-07-09 パイオニア株式会社 光学装置におけるフオ−カスサ−ボ引込装置
JPS5928828U (ja) * 1982-08-17 1984-02-22 パイオニア株式会社 情報検出用スポツト光の集束位置移動制御装置
JPS59183321A (ja) * 1983-04-01 1984-10-18 Canon Inc 蓄積型光電変換装置
JPS6077023U (ja) * 1983-11-01 1985-05-29 パイオニア株式会社 記録情報読取装置のフオ−カスレンズ移動制御装置
JPS6222244A (ja) * 1985-07-19 1987-01-30 Nippon Gakki Seizo Kk 光学式再生装置のフオ−カスサ−チ回路
JPS6326462A (ja) * 1986-07-16 1988-02-04 Sumitomo Heavy Ind Ltd 砥石軸駆動用モ−タプ−リの支持機構
JPS63217534A (ja) * 1987-03-04 1988-09-09 Fujitsu Ltd フオ−カス引込み回路
US5010538A (en) * 1987-05-25 1991-04-23 Oki Electric Industry Co., Ltd. Focus servo apparatus
JPH01192021A (ja) * 1988-01-28 1989-08-02 Mitsubishi Electric Corp 焦点自動引込装置
US5020045A (en) * 1988-12-19 1991-05-28 Eastman Kodak Company Focus acquisition servo system and associated method

Also Published As

Publication number Publication date
EP0460859A2 (de) 1991-12-11
JPH05217176A (ja) 1993-08-27
US5128913A (en) 1992-07-07
EP0460859A3 (en) 1992-04-01
EP0460859B1 (de) 1996-08-21
JP2682757B2 (ja) 1997-11-26
DE69121478T2 (de) 1997-02-13

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee