DE68906047D1 - Geraet und verfahren zum erreichen einer scharfeinstellung in einem optischen system. - Google Patents

Geraet und verfahren zum erreichen einer scharfeinstellung in einem optischen system.

Info

Publication number
DE68906047D1
DE68906047D1 DE8989850037T DE68906047T DE68906047D1 DE 68906047 D1 DE68906047 D1 DE 68906047D1 DE 8989850037 T DE8989850037 T DE 8989850037T DE 68906047 T DE68906047 T DE 68906047T DE 68906047 D1 DE68906047 D1 DE 68906047D1
Authority
DE
Germany
Prior art keywords
focus
reaching
optical system
optical
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
DE8989850037T
Other languages
English (en)
Other versions
DE68906047T2 (de
Inventor
Joseph Howard Dimatteo
Benjamin C Fiorino
Alan August Fennema
Julian Lewkowicz
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
Application granted granted Critical
Publication of DE68906047D1 publication Critical patent/DE68906047D1/de
Publication of DE68906047T2 publication Critical patent/DE68906047T2/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
DE89850037T 1988-02-12 1989-02-07 Gerät und Verfahren zum Erreichen einer Scharfeinstellung in einem optischen System. Expired - Fee Related DE68906047T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/155,390 US4998233A (en) 1988-02-12 1988-02-12 Acquiring focus in optical systems using a focus error signal and a laser drive signal

Publications (2)

Publication Number Publication Date
DE68906047D1 true DE68906047D1 (de) 1993-05-27
DE68906047T2 DE68906047T2 (de) 1993-10-28

Family

ID=22555235

Family Applications (1)

Application Number Title Priority Date Filing Date
DE89850037T Expired - Fee Related DE68906047T2 (de) 1988-02-12 1989-02-07 Gerät und Verfahren zum Erreichen einer Scharfeinstellung in einem optischen System.

Country Status (4)

Country Link
US (1) US4998233A (de)
EP (1) EP0328501B1 (de)
JP (1) JPH0624069B2 (de)
DE (1) DE68906047T2 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5101392A (en) * 1988-11-21 1992-03-31 Kabushiki Kaisha Toshiba Information recording apparatus
JP2774609B2 (ja) * 1989-09-18 1998-07-09 富士通株式会社 ディスク装置及びディスク制御方法
US5113384A (en) * 1989-09-25 1992-05-12 Hewlett-Packard Company Focus capture method for magneto-optic disk drives
JPH0719381B2 (ja) * 1989-10-04 1995-03-06 松下電器産業株式会社 フォーカス引き込み方式
JPH0485729A (ja) * 1990-07-27 1992-03-18 Nec Corp 光学的再生装置
US5233584A (en) * 1990-09-04 1993-08-03 International Business Machines Corporation Optical disk device using high and low data-sensing criteria plus device recalibration for error control
JPH05159327A (ja) * 1991-12-05 1993-06-25 Hitachi Ltd 光学式ディスクプレーヤにおけるフォーカスサーチ回路
US5564013A (en) * 1992-06-22 1996-10-08 Matsushita Electric Industrial Co., Ltd. Optical information recording and reproducing apparatus adapted to optically record and reproduce data in a sector, and method thereof
DE69425385T2 (de) * 1993-04-02 2001-02-15 Sony Corp., Tokio/Tokyo Servosystem zum Fokussieren und Verfahren zum Ermöglichen der Erfassung eines Fokussierungsservosystems
US8496705B2 (en) 1996-11-21 2013-07-30 DePuy Mitek, LLCR Method of anchoring autologous or artificial tendon grafts in bone
EP1006948B1 (de) 1996-11-21 2005-11-09 Ethicon, Inc. Vorrichtung zur befestigung von körpereigenen oder künstlichen sehnentransplantaten in knochen
KR100259972B1 (ko) * 1997-01-21 2000-06-15 윤종용 메모리 셀당 2개 이상의 저장 상태들을 갖는 불휘발성 반도체 메모리 장치
JP3563239B2 (ja) * 1997-07-10 2004-09-08 パイオニア株式会社 フォーカス制御装置
US7626899B2 (en) * 2003-08-06 2009-12-01 Chin-Yin Tsai Method for obtaining an optimum focusing point of an optical pickup unit and a servo system of an optical disk drive using this method

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949387A (en) * 1972-08-29 1976-04-06 International Business Machines Corporation Beam addressable film using amorphous magnetic material
FR2251876B1 (de) * 1973-11-16 1977-09-23 Thomson Brandt
US4190775A (en) * 1975-02-18 1980-02-26 Agency Of Industrial Science & Technology Optical memory playback apparatus
FR2304981A1 (fr) * 1975-03-21 1976-10-15 Thomson Brandt Dispositif d'enregistrement optique d'informations
US4439848A (en) * 1978-03-27 1984-03-27 Discovision Associates Focusing system for video disc player
NL7904724A (nl) * 1979-06-18 1980-12-22 Philips Nv Optische aftastinrichting met fokusseerstelsel.
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo
JPS5894143A (ja) * 1981-12-01 1983-06-04 Matsushita Electric Ind Co Ltd 光学的記録再生装置
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
US4446546A (en) * 1981-12-31 1984-05-01 Magnetic Peripherals Inc. Focus initialization system for optical recording
JPS58121137A (ja) * 1982-01-09 1983-07-19 Sony Corp 光学式デイスク再生装置のフオ−カス引込み回路
JPS58155527A (ja) * 1982-03-10 1983-09-16 Hitachi Ltd 光デイスクプレ−ヤのフオ−カス引き込み回路
EP0111010B1 (de) * 1982-06-04 1989-08-16 Sony Corporation Wiedergabegerät mit optischer scheibe
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
US4604739A (en) * 1984-04-16 1986-08-05 International Business Machines Corporation Optical focus detection employing rotated interference patterns
US4636625A (en) * 1984-09-06 1987-01-13 Ricoh Company, Ltd. Method and device for detecting focal point
DE3541002A1 (de) * 1984-11-20 1986-05-28 Olympus Optical Co., Ltd., Tokio/Tokyo Optisches informationsaufnahme- und -wiedergabespeichersystem
US4740679A (en) * 1985-02-27 1988-04-26 Olympus Optical Co., Ltd. Disc focus servo-circuit with ordered reference level setting means
US4701603A (en) * 1985-10-17 1987-10-20 Optical Disc Corporation Focus control system for optical information recorder or player
US4700056A (en) * 1985-11-13 1987-10-13 Optotech, Inc. Objective lens focus initialization system
EP0234594A3 (en) * 1986-02-28 1989-09-06 Kabushiki Kaisha Toshiba System capable of retrieving information from an optical memory
US4762986A (en) * 1986-03-10 1988-08-09 Canon Kabushiki Kaisha Automatic focussing system including in-focus position prediction means
JP2531942B2 (ja) * 1986-04-14 1996-09-04 ティアツク株式会社 光学式デイスク記録装置
JPS6313261A (ja) * 1986-07-02 1988-01-20 Japan Storage Battery Co Ltd 鉛電池の充電方法
US4789974A (en) * 1986-09-16 1988-12-06 Matsushita Electric Industrial Co., Ltd. Optical information recording/reproducing apparatus
US4841370A (en) * 1986-11-17 1989-06-20 Sanyo Electric Co., Ltd. Automatic focusing circuit for automatically matching focus in response to video signal
US4794581A (en) * 1987-06-25 1988-12-27 International Business Machines Corporation Lens support system enabling focussing and tracking motions employing a unitary lens holder

Also Published As

Publication number Publication date
JPH0624069B2 (ja) 1994-03-30
DE68906047T2 (de) 1993-10-28
EP0328501B1 (de) 1993-04-21
JPH01220129A (ja) 1989-09-01
EP0328501A1 (de) 1989-08-16
US4998233A (en) 1991-03-05

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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