JPH0110750Y2 - - Google Patents

Info

Publication number
JPH0110750Y2
JPH0110750Y2 JP1983161697U JP16169783U JPH0110750Y2 JP H0110750 Y2 JPH0110750 Y2 JP H0110750Y2 JP 1983161697 U JP1983161697 U JP 1983161697U JP 16169783 U JP16169783 U JP 16169783U JP H0110750 Y2 JPH0110750 Y2 JP H0110750Y2
Authority
JP
Japan
Prior art keywords
light
focus error
photodetector
signal
error signal
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
JP1983161697U
Other languages
English (en)
Japanese (ja)
Other versions
JPS6070923U (ja
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 filed Critical
Priority to JP1983161697U priority Critical patent/JPS6070923U/ja
Priority to DE19843438260 priority patent/DE3438260A1/de
Priority to US06/662,037 priority patent/US4663750A/en
Priority to GB08426517A priority patent/GB2150385B/en
Publication of JPS6070923U publication Critical patent/JPS6070923U/ja
Application granted granted Critical
Publication of JPH0110750Y2 publication Critical patent/JPH0110750Y2/ja
Granted 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
    • G11B7/094—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
    • 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

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
JP1983161697U 1983-10-19 1983-10-19 焦点誤差検出装置 Granted JPS6070923U (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP1983161697U JPS6070923U (ja) 1983-10-19 1983-10-19 焦点誤差検出装置
DE19843438260 DE3438260A1 (de) 1983-10-19 1984-10-18 Fokussierungsfehlerdetektorvorrichtung fuer ein optisches aufzeichnungs- und wiedergabegeraet
US06/662,037 US4663750A (en) 1983-10-19 1984-10-18 Focus error detection device for an optical recording/playing back system
GB08426517A GB2150385B (en) 1983-10-19 1984-10-19 Video disc focussing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1983161697U JPS6070923U (ja) 1983-10-19 1983-10-19 焦点誤差検出装置

Publications (2)

Publication Number Publication Date
JPS6070923U JPS6070923U (ja) 1985-05-20
JPH0110750Y2 true JPH0110750Y2 (en]) 1989-03-28

Family

ID=15740140

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1983161697U Granted JPS6070923U (ja) 1983-10-19 1983-10-19 焦点誤差検出装置

Country Status (4)

Country Link
US (1) US4663750A (en])
JP (1) JPS6070923U (en])
DE (1) DE3438260A1 (en])
GB (1) GB2150385B (en])

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899327A (en) * 1985-02-04 1990-02-06 International Business Machines Corporation Focus servo loop correction
US4823330A (en) * 1985-02-04 1989-04-18 International Business Machines Corporation Focus servo loop off-set compensation
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
EP0234594A3 (en) * 1986-02-28 1989-09-06 Kabushiki Kaisha Toshiba System capable of retrieving information from an optical memory
JPH0760527B2 (ja) * 1986-09-17 1995-06-28 パイオニア株式会社 光学式ピックアップ装置
JP2597560B2 (ja) * 1986-12-25 1997-04-09 株式会社東芝 情報処理装置
JPS648563A (en) * 1987-06-30 1989-01-12 Toshiba Corp Track counter
JPS6433779A (en) * 1987-07-30 1989-02-03 Toshiba Corp Track access device
US4942563A (en) * 1987-09-30 1990-07-17 Kabushiki Kaisha Toshiba Signal processing apparatus and method capable of providing precise digital data
JPH0827961B2 (ja) * 1987-11-11 1996-03-21 日本電気ホームエレクトロニクス株式会社 ホログラム式光ヘッドの光検出器
US4937440A (en) * 1989-08-29 1990-06-26 Hewlett-Packard Company System and method for beam farfield shift focus compensation
DE3936032A1 (de) * 1989-10-28 1991-05-02 Thomson Brandt Gmbh Fokusregelkreis
US5978329A (en) 1995-06-07 1999-11-02 Discovision Associates Technique for closed loop servo operation in optical disc tracking control
KR100316135B1 (ko) 1995-12-06 2002-04-24 데니스 피셸 빔 포커스 제어 장치 및 방법
US5689485A (en) 1996-04-01 1997-11-18 Discovision Associates Tracking control apparatus and method
CN102980739B (zh) * 2012-10-30 2015-05-20 华中科技大学 基于四象限探测器的脉冲气体激光器腔内流场测量装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057833A (en) * 1974-10-03 1977-11-08 U.S. Philips Corporation Centering detection system for an apparatus for playing optically readable record carriers
NL7708200A (nl) * 1976-07-28 1978-01-31 Hitachi Ltd Automatische scherpstellingsinrichting.
JPS5642060A (en) * 1979-09-14 1981-04-20 Kubota Ltd Building material
JPS58125241A (ja) * 1982-01-20 1983-07-26 Matsushita Electric Ind Co Ltd 光学記録再生装置
NL8200208A (nl) * 1982-01-21 1983-08-16 Philips Nv Inrichting voor het uitlezen van een schijfvormige registratiedrager.

Also Published As

Publication number Publication date
GB8426517D0 (en) 1984-11-28
JPS6070923U (ja) 1985-05-20
GB2150385B (en) 1987-06-17
DE3438260A1 (de) 1985-05-15
US4663750A (en) 1987-05-05
GB2150385A (en) 1985-06-26

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