KR970048684A - 빔 포커스 제어 장치 및 방법 - Google Patents

빔 포커스 제어 장치 및 방법 Download PDF

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KR970048684A
KR970048684A KR1019960061019A KR19960061019A KR970048684A KR 970048684 A KR970048684 A KR 970048684A KR 1019960061019 A KR1019960061019 A KR 1019960061019A KR 19960061019 A KR19960061019 A KR 19960061019A KR 970048684 A KR970048684 A KR 970048684A
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South Korea
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signal
medium
control
generating
servo circuit
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KR1019960061019A
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KR100316135B1 (ko
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루드위그 세스코브스키
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데니스 피셀
디스커비젼 어소우쉬에이트
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    • 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
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • 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
    • G11B7/094—Methods and circuits for servo offset compensation
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
    • 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
    • G11B7/0909—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 by astigmatic methods
    • 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
    • G11B7/0916—Foucault or knife-edge methods

Abstract

본 발명의 목적은 폐루프 서보 동작을 이용하여 다층의 광 매체 상에서 포커스를 시프팅하기 위한 제어 장치 및 방법을 제공하는데 있다.비점수차 광 픽업의 출력들은 시간에 따라 가변하는 소정의 패턴에 따라 제어 신호 발생기에서 독립적으로 변형되어 서보 회로에서 발견된 외관 초점 옵셋을 변경시키는 의사 에러 신호가 발생된다.폐루프 모드인 동안 서보 회로는 광 매체의 제1정보층에서 제2정보층으로 시프트하는 외관 초점면을 추적한다.그후 제어 신호는 제거되고,서보회로는 제2정보 영역 상에서 포커스를 고정시킨다.

Description

빔 포커스 제어 장치 및 방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제2도는 본 발명의 바람직한 실시예에 따른 포커스 제어 회로의 개략적인 부분 블럭 다이어그램.

Claims (7)

  1. 다수의 정보 영역을 가지며 상기 정보 영역으로부터의 옵셋에 따라 변화하는 특성을 갖는 매체상으로 전달되는 방사 에너지 빔을 제어하는 방법에 있어서,상기 매체 상으로 방사 에너지 빔을 전달시키는 단계와, 상기 매체와 상기 빔 간의 상호 작용으로부터 생성되는 에너지를 감지하는 단계와,상기 특성을 나타내는 상기 감지된 에너지에 응답하여,제1 및 제2신호를 발생시키는 단계와,상기 제1신호를 제1소정의 방식으로 변형하는 단계와,상기 제2신호를 제2소정의 방식으로 변형하는 단계와,상기 변형된 제1신호 및 상기 변형된 제2신호에 폐루프 모드로 동작하는 서보 회로를 결합시키는 단계와,상기 서보 회로를 빔 조정 수단에 결합시키는 단계를 포함하며,상기 서보 회로와 상기 빔 조정 수단이 협동하여 상기 매체의 제1정보 영역에 대한 상기 빔의 최적화(optimization)를 상기 매체의 제2정보 영역에 대한 상기 빔의 최적화로 변화시키는 것을 특징으로하는 방사 에너지 빔의 제어 방법.
  2. 제1항에 있어서,상기 제1신호는 상기 제2신호와 직각 관계에 있는 것을 특징으로 하는 방사 에너지 빔의 제어 방법.
  3. 제1항 또는 제2항에 있어서,상기 제1신호는 상기 제2신호와는 독립적으로 발생되는 것을 특징으로 하는 방사 에너지 빔의 제어 방법.
  4. 제3항에 있어서,상기 제1 및 제2신호는 소정의 위상각으로 서로 옵셋되어 있는 평활하게 연속적인 파형을 갖는 것을 특징으로 하는 방사 에너지 빔의 제어 방법.
  5. 다층의 광 매체 상으로 전달되는 포커스된 광 빔의 초점을 제어하기 위해,상기 매체로부터 반사되는 광에 응답하며 제1 및 제2출력을 갖는 광 픽업과,포커스 에러 신호를 발생하는 회로와,상기 포커스 에러 신호에 응답하는 포커스 에러 서보 회로와,상기 포커스 에러 서보 회로에 응답하여 상기 초점을 상기 매체로 이동시키거나 상기 매체에서 멀어지도록 이동시키는 액츄에이터 구동기를 포함하는 장치에 있어서,상기 포커스 에러 신호를 발생시키는 회로는,제1 및 제2제어 신호를 발생시키는 제어 신호 발생기와,상기 광 픽업의 상기 제1출력 및 상기 제1제어 신호에 결합된 제1승산기와,상기 광 픽업의 상기 제2출력 및 상기 제2제어 신호에 결합된 제2승산기를 포함하는 것을 특징으로 하는 포커스된 광 빔의 초점을 제어하는 장치.
  6. 제5항에 있어서,상기 제1출력은 상기 제2출력과 직각 관계에 있는 것을 특징으로 하는 포커스된 광 빔의 초점을 제어하는 장치.
  7. 제5항 또는 제6항에 있어서,상기 제1 및 제2제어 신호는 소정의 위상각으로 서로 옵셋되어 있는 평활하게 연속적으로 파형을 갖는 것을 특징으로 하는 포커스된 광 빔의 초점을 제어하는 장치.
    ※ 참고사항: 최초출원 내용에 의하여 공개하는 것임.
KR1019960061019A 1995-12-06 1996-12-02 빔 포커스 제어 장치 및 방법 KR100316135B1 (ko)

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US56942095A 1995-12-06 1995-12-06
US08/569,420 1995-12-06

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US (1) US5978331A (ko)
EP (1) EP0777218B1 (ko)
JP (1) JP3216079B2 (ko)
KR (1) KR100316135B1 (ko)
CN (1) CN1077715C (ko)
AT (1) ATE201277T1 (ko)
BR (1) BR9605836B1 (ko)
CA (1) CA2192140C (ko)
DE (1) DE69612819T2 (ko)
ES (1) ES2112224T1 (ko)
HK (1) HK1001629A1 (ko)
MX (1) MX9606103A (ko)
MY (1) MY115226A (ko)
NO (1) NO319514B1 (ko)
SG (1) SG64410A1 (ko)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5689485A (en) 1996-04-01 1997-11-18 Discovision Associates Tracking control apparatus and method
JPH10283644A (ja) * 1997-04-02 1998-10-23 Sony Corp 焦点制御装置および方法、光ディスク装置
JP3758412B2 (ja) * 1999-04-08 2006-03-22 富士通株式会社 光記憶装置とフォーカスサーボ制御方法
JP3728390B2 (ja) * 1999-10-08 2005-12-21 パイオニア株式会社 フォーカスサーボ制御装置並びに情報再生装置及び情報記録装置
US6744711B1 (en) 2000-06-20 2004-06-01 Discovision Associates Method and apparatus for a high-speed search of an optical medium
JP2002304746A (ja) * 2001-04-05 2002-10-18 Pioneer Electronic Corp フォーカシング制御装置
EP1732071A1 (en) * 2005-06-09 2006-12-13 Sony Corporation Lens positioning method, cutting method, positioning method and cutting apparatus
JP2007035133A (ja) * 2005-07-26 2007-02-08 Sony Corp レンズ位置制御方法、レンズ位置制御装置、カッティング方法およびカッティング装置

Family Cites Families (164)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US32709A (en) * 1861-07-02 Soda-water apparatus
US32051A (en) * 1861-04-16 Lotjghlin
US32431A (en) * 1861-05-28 Improvement in cultivators
US32574A (en) * 1861-06-18 Wateb-elevator
US4893297A (en) 1968-06-06 1990-01-09 Discovision Associates Disc-shaped member
US3530258A (en) * 1968-06-28 1970-09-22 Mca Technology Inc Video signal transducer having servo controlled flexible fiber optic track centering
US3633038A (en) * 1970-05-01 1972-01-04 Newell Ind Transducer-positioning system using radiation-sensitive means
US3924062A (en) * 1972-10-24 1975-12-02 Mca Disco Vision Disc record with skipped standard video increments and continuous audio increments and a method and apparatus for reproduction
US3829622A (en) * 1972-10-24 1974-08-13 Mca Disco Vision Video disc player with variably biased pneumatic head
US3908076A (en) * 1972-10-24 1975-09-23 Mca Disco Vision Extended play videodisc recording system
US4809247A (en) 1972-10-24 1989-02-28 Discovision Associates Video disc head tracking apparatus
US3944727A (en) * 1972-10-24 1976-03-16 Mca Discovision, Inc. Video disc player with movable mirror for directing light beam onto reflective disc
US3908080A (en) * 1972-10-24 1975-09-23 Mca Disco Vision Method of making an extended play video disc record
US4282598A (en) * 1972-10-24 1981-08-04 Discovision Associates Video disc read back scanner
US4451913A (en) * 1972-10-24 1984-05-29 Discovision Associates Video disc read back scanner
US4703467A (en) * 1972-10-24 1987-10-27 Discovision Associates Video disc read back scanner
US3914541A (en) * 1972-12-11 1975-10-21 Mca Disco Vision Video disc player
US3794410A (en) * 1973-02-20 1974-02-26 Mca Disco Vision Articulated mirror
US4611318A (en) * 1973-02-20 1986-09-09 Discovision Associates Method and apparatus for monitoring the storage of information on a storage medium
US4583210A (en) * 1973-02-20 1986-04-15 Discovision Associates Method and apparatus for storing and retrieving information
US4225873A (en) * 1978-03-27 1980-09-30 Mca Disco-Vision, Inc. Recording and playback system
US4358802A (en) * 1973-10-01 1982-11-09 Mca Disco-Vision, Inc. Fluid cushion turntable for video disc player
US3932700A (en) * 1974-02-04 1976-01-13 Zenith Radio Corporation Focus tracking registration for optical reproducing systems
US3997715A (en) * 1974-03-25 1976-12-14 Mca Disco-Vision, Inc. Focusing system for videodisc player
AR205839A1 (es) * 1974-09-30 1976-06-07 Mca Disco Vision Servodisposicion para recorrer opticamente y leer simultaneamente un canal de informacion almacenado en un disco de video
GB1603596A (en) 1977-06-06 1981-11-25 Mca Disco Vision Optical transducer and focusing system
US4161752A (en) * 1977-06-28 1979-07-17 International Business Machines Corporation High density video disk having two pit depths
US4161753A (en) * 1977-07-08 1979-07-17 International Business Machines Corporation Video recording disk with interlacing of data for frames on the same track
USRE32051E (en) 1978-03-27 1985-12-17 Discovision Associates Tracking system and method for video disc player
US4456914A (en) * 1978-03-27 1984-06-26 Discovision Associates Method and apparatus for storing information on a storage medium
US4340955A (en) * 1978-03-27 1982-07-20 Discovision Associates Video disc player
US4358796A (en) * 1978-03-27 1982-11-09 Discovision Associates Spindle servo system for videodisc player
US4371899A (en) * 1978-03-27 1983-02-01 Discovision Associates Time base error correction system for player
US4332022A (en) 1978-03-27 1982-05-25 Discovision Associates Tracking system and method for video disc player
US4439848A (en) * 1978-03-27 1984-03-27 Discovision Associates Focusing system for video disc player
US4370679A (en) * 1978-03-27 1983-01-25 Discovision Associates Gain correction system for videodisc player apparatus
USRE32709E (en) 1978-03-27 1988-07-05 Discovision Associates Tracking system for video disc player
USRE32574E (en) 1978-06-30 1988-01-05 Discovision Associates Method and apparatus for information retrieval from an optically readable storage medium
US4375091A (en) * 1978-06-30 1983-02-22 Discovision Associates Method and apparatus for information retrieval from an optically readable storage medium
US4374323A (en) * 1978-06-30 1983-02-15 Discovision Associates Focusing apparatus for use in a system for recovering information from an optically-readable storage medium
NL7808638A (nl) * 1978-08-22 1980-02-26 Philips Nv Inrichting voor het uitlezen van een schijfvormige re- gistratiedrager.
US4190860A (en) * 1978-11-16 1980-02-26 Mca Discovision, Inc. Digital method and apparatus for rotating an information storage disc
USRE32431E (en) 1978-11-16 1987-06-02 Discovision Associates System for rotating an information storage disc at a variable angular velocity to recover information therefrom at a prescribed constant rate
US4228326A (en) * 1978-11-16 1980-10-14 Mca Discovision Inc. System for recording information on a rotatable storage disc, in a substantially uniform recording density
US4232201A (en) * 1978-11-24 1980-11-04 Mca Discovision, Inc. Dithered center tracking system
US4232337A (en) * 1978-12-13 1980-11-04 Mca Discovision, Inc. Method and apparatus for tracking an optically readable information track
US4236105A (en) * 1979-01-12 1980-11-25 Mca Discovision, Inc. Digital center tracking system
US4234837A (en) * 1979-01-12 1980-11-18 Mca Discovision, Inc. Digital center tracking system
US4310919A (en) * 1979-01-15 1982-01-12 Discovision Associates Optical video disc structure
US4367545A (en) * 1979-02-16 1983-01-04 Discovision Associates Video disc player
US4252327A (en) * 1979-02-16 1981-02-24 Mca Discovision, Inc. Video disc player
US4271334A (en) * 1979-04-06 1981-06-02 Discovision Associates Apparatus for correcting for temperature-induced tracking errors in a system for recovering information from a recording disc
GB2046979B (en) * 1979-04-17 1983-05-18 Burroughs Corp Recording and replay apparatus employing rotary media
US4397805A (en) * 1979-04-18 1983-08-09 Discovision Associates Method for making a video disc
US4337534A (en) * 1979-04-18 1982-06-29 Discovision Associates Solid state electro-optical track follower array
US4353090A (en) * 1979-06-20 1982-10-05 Discovision Associates Extended play video recording and reproducing system with selection of multiplexed audio
US4583131A (en) * 1979-08-15 1986-04-15 Discovision Associates Method and apparatus for stop-motion playback of a record disc
US5018020A (en) 1979-08-15 1991-05-21 Discovision Associates Record disc for storing separate video and audio information
US4445209A (en) * 1979-08-27 1984-04-24 Discovision Associates Dithered focusing systems
US4322837A (en) * 1979-08-27 1982-03-30 Discovision Associates Dithered center tracking system
US4357533A (en) * 1980-07-14 1982-11-02 Discovision Associates Focus detector for an optical disc playback system
US4358774A (en) * 1980-07-14 1982-11-09 Discovision Associates Apparatus and method for controlling focus in a recording system
US4347599A (en) * 1980-10-20 1982-08-31 Discovision Associates Spindle clamp assembly for a video recorder-playback machine
US4337538A (en) * 1980-10-20 1982-06-29 Discovision Associates Drive assembly for a video recorder-playback machine
US4488279A (en) * 1980-10-20 1984-12-11 Discovision Associates Video recorder-playback machine
US4467467A (en) * 1980-10-20 1984-08-21 Discovision Associates Video recorder-playback machine
US4450488A (en) * 1980-10-31 1984-05-22 Discovision Associates System for recording continuous-play and stop-motion signal
US4463389A (en) * 1980-10-31 1984-07-31 Discovision Associates System for recording and playing back continuous-play and stop-motion signals
US4980878A (en) 1981-02-02 1990-12-25 Discovision Associates Method and apparatus for scanning a recording medium for defects
US4571716A (en) * 1981-02-02 1986-02-18 Discovision Associates Method and apparatus for scanning a recording medium for defects
US4414655A (en) * 1981-03-31 1983-11-08 Discovision Associates Scanning beam control system
US4406000A (en) * 1981-03-31 1983-09-20 Discovision Associates Tracking system for optical record medium
JPS57181436A (en) * 1981-05-01 1982-11-08 Toshiba Corp Optical disc device
US4412743A (en) * 1981-09-08 1983-11-01 Discovision Associates Off-axis light beam defect detector
JPS5870434A (ja) * 1981-10-22 1983-04-26 Toshiba Corp 光学ヘツド
JPS5888874A (ja) * 1981-11-20 1983-05-27 Toshiba Corp 情報記録再生装置
NL8105346A (ko) * 1981-11-26 1983-06-16
US4796098A (en) 1981-12-04 1989-01-03 Discovision Associates Banded and interleaved video disc format with duplicate information stored at different disc locations
US4566090A (en) * 1981-12-10 1986-01-21 Discovision Associates Storage medium track pitch detector
US4759007A (en) * 1981-12-10 1988-07-19 Discovision Associates Storage medium track pitch detector
US4504939A (en) * 1981-12-10 1985-03-12 Discovision Associates Storage medium track pitch detector
US4648084A (en) * 1981-12-10 1987-03-03 Discovision Associates Storage medium track pitch detector
US4774699A (en) * 1981-12-21 1988-09-27 Discovision Associates Method and apparatus for positioning a read head to a selected track on a record disc
US4701898A (en) * 1981-12-21 1987-10-20 Discovision Associates Method and apparatus for locating a selected track on a record disc
US4445144A (en) * 1981-12-21 1984-04-24 Discovision Associates Method for detecting eccentricity in a video disc and in a video disc player
JPS58125242A (ja) * 1982-01-22 1983-07-26 Victor Co Of Japan Ltd 光学的情報信号再生装置のトラツキング誤差検出方式
US4727433A (en) * 1982-01-25 1988-02-23 Discovision Associates Video/audio coded data recovery from a record medium
US4638377A (en) * 1982-01-25 1987-01-20 Discovision Associates Selectable video/audio coded data recovery from a record medium
US4757393A (en) * 1982-01-25 1988-07-12 Discovision Associates Multiple variable rate audio message playback
US4703368A (en) * 1982-01-25 1987-10-27 Discovision Associates Multiple variable rate audio message recording and playback
DE3302918A1 (de) * 1982-01-28 1983-08-04 Ricoh Co., Ltd., Tokyo Optische aufzeichnungs- und/oder leseeinrichtung
US4477890A (en) * 1982-03-01 1984-10-16 Discovision Associates Mapping disc defect detector
US4536863A (en) * 1982-04-15 1985-08-20 Discovision Associates Method and apparatus for recovering information from a videodisc
US4706133A (en) * 1982-04-15 1987-11-10 Discovision Associates Method and apparatus for recovering information from a videodisc
US4751692A (en) * 1982-04-15 1988-06-14 Discovision Associates Method and apparatus for recovering information from a videodisc
US4845697A (en) 1982-04-15 1989-07-04 Discovision Associates Method of time limited searching for a track address on an optically read information disc
US4727532A (en) * 1982-04-15 1988-02-23 Discovision Associates Method and apparatus for recovering information from a videodisc
US4519004A (en) * 1982-06-01 1985-05-21 Discovision Associates Extended play videodisc
US4465977A (en) * 1982-06-04 1984-08-14 Discovision Associates Erroneous pulse sequence detector
US4499569A (en) * 1982-09-07 1985-02-12 Discovision Associates Writing beam focus monitor
JPS5956262A (ja) * 1982-09-27 1984-03-31 Toshiba Corp デイスク装置
US4516177A (en) * 1982-09-27 1985-05-07 Quantum Corporation Rotating rigid disk data storage device
US4514771A (en) * 1982-10-13 1985-04-30 Victor Technologies Inc. Method and apparatus for improving disk storage capacity
JPS59128519U (ja) * 1983-02-17 1984-08-29 株式会社東芝 位置検出装置
JPS59191144A (ja) 1983-04-14 1984-10-30 Sony Corp 光ピツクアツプのトラツキングサ−ボ回路
JPS6070923U (ja) 1983-10-19 1985-05-20 パイオニア株式会社 焦点誤差検出装置
US4590527A (en) * 1983-11-14 1986-05-20 Burroughs Corporation Positioning servomechanisms
US4607157A (en) 1984-02-09 1986-08-19 Xerox Corporation Automatic focus offset correction system
NL8400674A (nl) * 1984-03-02 1985-10-01 Philips Nv Inrichting voor het inschrijven en/of uitlezen van informatie in een spoor van een reflekterende registratiedrager, met een fokusregeling met verminderde spot offsetgevoeligheid.
JP2548106B2 (ja) * 1984-05-23 1996-10-30 ソニー株式会社 光学式デイスクプレ−ヤのトラツキング・サ−ボコントロ−ル装置
US4571712A (en) * 1984-07-06 1986-02-18 Storage Technology Partners Ii Beam alignment signal processing
JP2565485B2 (ja) * 1984-09-14 1996-12-18 オリンパス光学工業株式会社 光学的記録再生装置
JPS61129778A (ja) 1984-11-28 1986-06-17 Pioneer Electronic Corp デイスク再生方式
JP2786181B2 (ja) 1985-12-21 1998-08-13 ソニー株式会社 光ディスク装置
JPS62192031A (ja) 1986-02-19 1987-08-22 Olympus Optical Co Ltd 光学的記録再生装置
JPH052804Y2 (ko) 1986-05-21 1993-01-25
US5124964A (en) 1986-08-12 1992-06-23 Kabushiki Kaisha Toshiba Focus servo gain setting circuit for optical record disc reproducing apparatus
JPH0734288B2 (ja) 1986-09-24 1995-04-12 株式会社日立製作所 デイスク回転駆動装置
JPS6437773A (en) 1987-08-01 1989-02-08 Sony Corp Track jump device of disk device
JP2696822B2 (ja) 1987-01-22 1998-01-14 ソニー株式会社 トラツキングサーボ装置
US4779251A (en) * 1987-06-12 1988-10-18 Optimem Optical disk memory system with closed loop micro-jump between adjacent tracks
JPS6446270A (en) 1987-08-13 1989-02-20 Pioneer Electronic Corp Searching method in disk player
JPS6468814A (en) 1987-09-10 1989-03-14 Canon Kk Method and device for position control of moving object
US5267226A (en) 1987-12-03 1993-11-30 Canon Kabushiki Kaisha Optical information recording and reproducing apparatus with switchable spot-functions
JPH01208777A (ja) 1988-02-03 1989-08-22 Internatl Business Mach Corp <Ibm> デイスク装置のサーボ・パターンの書込み方法
US4950890A (en) 1988-07-13 1990-08-21 Creo Electronics Corp. Method and apparatus for correcting position errors using writable encoders
US5396477A (en) 1988-09-21 1995-03-07 Hitachi, Ltd. Light spot positioning method and optical disc memory apparatus employing the same
US4980876A (en) 1988-10-03 1990-12-25 Maxoptix Corporation Single stage track seek method
NL8802435A (nl) 1988-10-05 1990-05-01 Philips Nv Inrichting voor het aftasten van een registratiedrager, alsmede een regelschakeling voor toepassing in een dergelijke inrichting.
US5087973A (en) 1988-11-17 1992-02-11 Matsushita Electric Industrial Co., Ltd. Clamp signal processing apparatus
JP2785195B2 (ja) 1989-01-11 1998-08-13 ソニー株式会社 ディスク装置の光学式エンコーダ
JP2706294B2 (ja) 1989-01-25 1998-01-28 キヤノン株式会社 光学的情報記録再生装置
JP2734054B2 (ja) 1989-02-03 1998-03-30 ソニー株式会社 光ディスク装置のトラッキングエラー検出装置及びトラッキングエラー検出方法
JP2615488B2 (ja) 1989-02-07 1997-05-28 松下電器産業株式会社 光学式記録再生装置のトラッキング制御装置
US5251194A (en) 1989-04-17 1993-10-05 Mitsubishi Denki Kabushiki Kaisha Techniques for controlling beam position and focus in optical disk drives
DE3916462A1 (de) 1989-05-20 1990-11-22 Thomson Brandt Gmbh Verfahren zum spurspringen
JPH03129411A (ja) 1989-07-18 1991-06-03 Asahi Optical Co Ltd サーボ装置
US5270886A (en) 1989-08-07 1993-12-14 Antek Peripherals, Inc. Two motor servo system for a removable disk drive
JPH0766547B2 (ja) 1989-08-31 1995-07-19 富士通株式会社 光デイスク装置
JPH03100931A (ja) 1989-09-14 1991-04-25 Mitsubishi Electric Corp 光学式情報記録再生装置
JP2797579B2 (ja) 1989-12-28 1998-09-17 ソニー株式会社 目標トラック位置検索装置
JPH0756730B2 (ja) 1989-12-28 1995-06-14 パイオニア株式会社 スピンドルサーボ回路
US5319622A (en) 1990-02-09 1994-06-07 Ast Research, Inc. Control and information disk for disk recording system
US5138594A (en) 1990-04-20 1992-08-11 International Business Machines Corporation Reducing amplitude variations of optical disk readback signals and increasing reliability of track-crossing counts
US5257251A (en) 1990-05-25 1993-10-26 International Business Machines Corporation Single loop servo-positioning systems having means for changing the dynamic range of a position-error signal with speed of the relatively movable members
JP2870127B2 (ja) 1990-05-31 1999-03-10 ソニー株式会社 トラッキング制御方法
JP2802310B2 (ja) 1990-06-15 1998-09-24 パイオニア株式会社 光学式ディスクの記録装置
JP2563648B2 (ja) 1990-06-18 1996-12-11 松下電器産業株式会社 光学式記録再生装置
JP2793698B2 (ja) 1990-06-18 1998-09-03 株式会社リコー フオーカスオフセット補正方法
JPH0778890B2 (ja) 1990-10-03 1995-08-23 インターナシヨナル・ビジネス・マシーンズ・コーポレーシヨン ディスク記憶装置
CA2054880C (en) 1990-11-09 1997-07-08 Shigemi Maeda Information recording and reproducing device
JPH04254919A (ja) 1991-02-07 1992-09-10 Hitachi Ltd トラッキング制御方法及び装置
US5168356A (en) 1991-02-27 1992-12-01 General Electric Company Apparatus for segmenting encoded video signal for transmission
TW218427B (ko) * 1991-06-04 1994-01-01 Ibm
US5189293A (en) 1991-06-27 1993-02-23 U.S. Philips Corporation Optical scanning apparatus including beam focal point position control when out of focus range
JPH0581685A (ja) 1991-09-24 1993-04-02 Sony Corp 光学式デイスク装置
US5210726A (en) 1992-02-07 1993-05-11 Maxoptix Corporation Track seek method utilizing an ideal signal
DE69317831T2 (de) * 1992-08-04 1998-08-06 Sony Corp Wiedergabegerät
US5394385A (en) 1992-09-07 1995-02-28 Olympus Optical Co., Ltd. Optical information recording/reproducing apparatus for performing positioning of recording/reproducing spot by selection of pairs of photo detecting elements
US5294894A (en) 1992-10-02 1994-03-15 Compaq Computer Corporation Method of and apparatus for startup of a digital computer system clock
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
US5315372A (en) 1993-01-04 1994-05-24 Excel Precision, Inc. Non-contact servo track writing apparatus having read/head arm and reference arm
US5304953A (en) 1993-06-01 1994-04-19 Motorola, Inc. Lock recovery circuit for a phase locked loop
US5568461A (en) 1994-04-20 1996-10-22 Matsushita Electric Industrial Co., Ltd. Optical information recording and reproducing apparatus

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NO965149L (no) 1997-06-09
CN1077715C (zh) 2002-01-09
KR100316135B1 (ko) 2002-04-24
ATE201277T1 (de) 2001-06-15
MX9606103A (es) 1997-08-30
ES2112224T1 (es) 1998-04-01
CA2192140A1 (en) 1997-06-07
MY115226A (en) 2003-04-30
NO319514B1 (no) 2005-08-22
US5978331A (en) 1999-11-02
CN1155088A (zh) 1997-07-23
DE69612819D1 (de) 2001-06-21
EP0777218B1 (en) 2001-05-16
JPH09185828A (ja) 1997-07-15
CA2192140C (en) 2002-02-12
BR9605836A (pt) 1998-08-25
HK1001629A1 (en) 1998-07-03
SG64410A1 (en) 1999-04-27
BR9605836B1 (pt) 2009-08-11
NO965149D0 (no) 1996-12-03
DE69612819T2 (de) 2002-01-17
JP3216079B2 (ja) 2001-10-09
EP0777218A1 (en) 1997-06-04

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