JPH0447376B2 - - Google Patents

Info

Publication number
JPH0447376B2
JPH0447376B2 JP57140232A JP14023282A JPH0447376B2 JP H0447376 B2 JPH0447376 B2 JP H0447376B2 JP 57140232 A JP57140232 A JP 57140232A JP 14023282 A JP14023282 A JP 14023282A JP H0447376 B2 JPH0447376 B2 JP H0447376B2
Authority
JP
Japan
Prior art keywords
signal
reproduction
recording medium
optical
light
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 - Lifetime
Application number
JP57140232A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5930249A (ja
Inventor
Izumi Ichikawa
Hideaki Sato
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP57140232A priority Critical patent/JPS5930249A/ja
Priority to US06/521,347 priority patent/US4613964A/en
Publication of JPS5930249A publication Critical patent/JPS5930249A/ja
Publication of JPH0447376B2 publication Critical patent/JPH0447376B2/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
    • G11B7/12—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
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/22—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions
    • G11B20/225—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions for reducing wow or flutter
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
    • 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
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
JP57140232A 1982-08-12 1982-08-12 光学的情報再生装置 Granted JPS5930249A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP57140232A JPS5930249A (ja) 1982-08-12 1982-08-12 光学的情報再生装置
US06/521,347 US4613964A (en) 1982-08-12 1983-08-08 Optical information processing method and apparatus therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57140232A JPS5930249A (ja) 1982-08-12 1982-08-12 光学的情報再生装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP3338598A Division JPH0752510B2 (ja) 1991-12-20 1991-12-20 光学的情報記録装置

Publications (2)

Publication Number Publication Date
JPS5930249A JPS5930249A (ja) 1984-02-17
JPH0447376B2 true JPH0447376B2 (en]) 1992-08-03

Family

ID=15263975

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57140232A Granted JPS5930249A (ja) 1982-08-12 1982-08-12 光学的情報再生装置

Country Status (2)

Country Link
US (1) US4613964A (en])
JP (1) JPS5930249A (en])

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6150222A (ja) * 1984-08-16 1986-03-12 Pioneer Electronic Corp 光学式記録情報再生装置
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
EP0247829A1 (en) * 1986-05-26 1987-12-02 Pioneer Electronic Corporation Method and apparatus for correcting loop gain of a fine adjustment servo loop
JP3106750B2 (ja) * 1992-12-11 2000-11-06 松下電器産業株式会社 ディスク再生装置
JPH1165748A (ja) 1997-08-22 1999-03-09 Canon Inc 座標入力装置及びセンサ装着構造及び方法
JP4776832B2 (ja) * 2000-10-19 2011-09-21 キヤノン株式会社 座標入力装置、および、画像入力装置の座標板
JP2002236546A (ja) * 2001-02-08 2002-08-23 Canon Inc 座標入力装置及びその制御方法、コンピュータ可読メモリ
JP4590114B2 (ja) * 2001-02-08 2010-12-01 キヤノン株式会社 座標入力装置及びその制御方法、記録媒体
JP4789511B2 (ja) * 2004-06-04 2011-10-12 キヤノン株式会社 状況モニタリング装置及び状況モニタリングシステム
JP4455392B2 (ja) * 2005-04-15 2010-04-21 キヤノン株式会社 座標入力装置及びその制御方法、プログラム
JP2008040858A (ja) * 2006-08-08 2008-02-21 Hitachi Ltd 情報処理機器及び情報処理システム
US7635833B2 (en) * 2007-01-10 2009-12-22 Forza Silicon Electronic neutral density filter
JP5973849B2 (ja) 2012-03-08 2016-08-23 キヤノン株式会社 座標入力装置および座標入力装置に用いられるセンサバー
JP5875445B2 (ja) 2012-03-30 2016-03-02 キヤノン株式会社 座標入力装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5948447B2 (ja) * 1977-07-20 1984-11-27 ソニー株式会社 信号再生装置の利得補償回路
US4370679A (en) * 1978-03-27 1983-01-25 Discovision Associates Gain correction system for videodisc player apparatus
US4340950A (en) * 1979-10-12 1982-07-20 Universal Pioneer Corporation Video disc player

Also Published As

Publication number Publication date
JPS5930249A (ja) 1984-02-17
US4613964A (en) 1986-09-23

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