CA1183261A - Focus initialization system for optical recording - Google Patents

Focus initialization system for optical recording

Info

Publication number
CA1183261A
CA1183261A CA000414437A CA414437A CA1183261A CA 1183261 A CA1183261 A CA 1183261A CA 000414437 A CA000414437 A CA 000414437A CA 414437 A CA414437 A CA 414437A CA 1183261 A CA1183261 A CA 1183261A
Authority
CA
Canada
Prior art keywords
signal
input
logic
focusing
output
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
Application number
CA000414437A
Other languages
English (en)
French (fr)
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.)
Magnetic Peripherals Inc
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
Application granted granted Critical
Publication of CA1183261A publication Critical patent/CA1183261A/en
Expired 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

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
CA000414437A 1981-12-31 1982-10-28 Focus initialization system for optical recording Expired CA1183261A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US336,245 1981-12-31
US06/336,245 US4446546A (en) 1981-12-31 1981-12-31 Focus initialization system for optical recording

Publications (1)

Publication Number Publication Date
CA1183261A true CA1183261A (en) 1985-02-26

Family

ID=23315207

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000414437A Expired CA1183261A (en) 1981-12-31 1982-10-28 Focus initialization system for optical recording

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
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
AU550579B2 (en) 1986-03-27

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Legal Events

Date Code Title Description
MKEC Expiry (correction)
MKEX Expiry