AU550579B2 - Focusing control system - Google Patents

Focusing control system

Info

Publication number
AU550579B2
AU550579B2 AU91376/82A AU9137682A AU550579B2 AU 550579 B2 AU550579 B2 AU 550579B2 AU 91376/82 A AU91376/82 A AU 91376/82A AU 9137682 A AU9137682 A AU 9137682A AU 550579 B2 AU550579 B2 AU 550579B2
Authority
AU
Australia
Prior art keywords
control system
focusing control
focusing
control
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
AU91376/82A
Other languages
English (en)
Other versions
AU9137682A (en
Inventor
Christopher Miller
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.)
Control Data Corp
Original Assignee
Magnetic Peripherals Inc
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 Magnetic Peripherals Inc filed Critical Magnetic Peripherals Inc
Publication of AU9137682A publication Critical patent/AU9137682A/en
Application granted granted Critical
Publication of AU550579B2 publication Critical patent/AU550579B2/en
Anticipated expiration legal-status Critical
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
    • 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
    • G11B7/09—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
AU91376/82A 1981-12-31 1982-12-09 Focusing control system Ceased AU550579B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/336,245 US4446546A (en) 1981-12-31 1981-12-31 Focus initialization system for optical recording
US336245 1981-12-31

Publications (2)

Publication Number Publication Date
AU9137682A AU9137682A (en) 1983-07-07
AU550579B2 true AU550579B2 (en) 1986-03-27

Family

ID=23315207

Family Applications (1)

Application Number Title Priority Date Filing Date
AU91376/82A Ceased AU550579B2 (en) 1981-12-31 1982-12-09 Focusing control system

Country Status (6)

Country Link
US (1) US4446546A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0083838B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS58121144A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AU (1) AU550579B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1183261A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE3271458D1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (21)

* 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
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
WO1983004329A1 (en) * 1982-06-04 1983-12-08 Sony Corporation Optical disc reproducer
JPH0677326B2 (ja) * 1982-07-24 1994-09-28 パイオニア株式会社 情報読取装置のフォ−カスサ−ボ装置
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
JPS59116942A (ja) * 1982-12-23 1984-07-06 Olympus Optical Co Ltd オ−トフォ−カス装置
US4740679A (en) * 1985-02-27 1988-04-26 Olympus Optical Co., Ltd. Disc focus servo-circuit with ordered reference level setting means
JPH0736233B2 (ja) * 1985-04-16 1995-04-19 オリンパス光学工業株式会社 光学的情報記録再生装置
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
JPS62188031A (ja) * 1986-02-13 1987-08-17 Csk Corp 焦点整合位置検出方式
US4878211A (en) * 1986-05-26 1989-10-31 Pioneer Electronic Corporation Method and apparatus for correcting the loop gain of a servo loop in accordance with measurements during open-loop operation
JPH0695425B2 (ja) * 1987-04-15 1994-11-24 パイオニア株式会社 デイスク検出方式
US4879706A (en) * 1987-07-29 1989-11-07 Laser Magnetic Storage International Company Method and apparatus for focus and tracking in an optical disk system
US4998233A (en) * 1988-02-12 1991-03-05 International Business Machines Corporation Acquiring focus in optical systems using a focus error signal and a laser drive signal
US5020045A (en) * 1988-12-19 1991-05-28 Eastman Kodak Company Focus acquisition servo system and associated method
EP0463068A1 (en) * 1989-03-17 1992-01-02 Optical Recording Corporation Optical recording and/or playback system
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
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
CN101335022B (zh) * 2007-06-26 2011-01-05 宏阳科技股份有限公司 光驱的聚焦回路变异的校正方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2251876B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1973-11-16 1977-09-23 Thomson Brandt
US3932700A (en) * 1974-02-04 1976-01-13 Zenith Radio Corporation Focus tracking registration for optical reproducing systems
NL182257C (nl) * 1974-12-23 1988-02-01 Philips Nv Inrichting voor het uitlezen van een vlakke reflekterende registratiedrager waarop informatie is aangebracht in een optisch uitleesbare struktuur.
FR2330062A1 (fr) * 1975-10-31 1977-05-27 Thomson Brandt Dispositif de recherche de focalisation et lecteur optique comportant un tel dispositif
NL7703077A (nl) * 1977-03-22 1978-09-26 Philips Nv Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager.
JPS5830263Y2 (ja) * 1977-08-29 1983-07-04 三洋電機株式会社 光学式ディスク再生機の自動焦点深索装置
JPS54124705A (en) * 1978-03-20 1979-09-27 Teac Corp Optical reproducer
JPS5514580A (en) * 1978-07-19 1980-02-01 Pioneer Video Corp Focus servo unit
GB2027881B (en) * 1978-07-19 1983-04-27 Universal Pioneer Corp In-focus detecting device
JPS5538639A (en) * 1978-09-07 1980-03-18 Pioneer Video Corp Servo drawing-in unit for focus lens of optical information reader
FR2458126A1 (fr) * 1979-05-31 1980-12-26 Thomson Brandt Systeme de commande de changement de face lue pour un lecteur optique de support d'information et lecteur optique comportant un tel systeme

Also Published As

Publication number Publication date
AU9137682A (en) 1983-07-07
CA1183261A (en) 1985-02-26
US4446546A (en) 1984-05-01
JPS58121144A (ja) 1983-07-19
EP0083838B1 (en) 1986-05-28
EP0083838A3 (en) 1983-10-26
DE3271458D1 (en) 1986-07-03
EP0083838A2 (en) 1983-07-20
JPH0339334B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1991-06-13

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