JPS57208642A - Focus controller - Google Patents

Focus controller

Info

Publication number
JPS57208642A
JPS57208642A JP56094424A JP9442481A JPS57208642A JP S57208642 A JPS57208642 A JP S57208642A JP 56094424 A JP56094424 A JP 56094424A JP 9442481 A JP9442481 A JP 9442481A JP S57208642 A JPS57208642 A JP S57208642A
Authority
JP
Japan
Prior art keywords
signal
control
reflected light
focus
envelope curve
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.)
Granted
Application number
JP56094424A
Other languages
English (en)
Other versions
JPH0316694B2 (ja
Inventor
Masafumi Yokota
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56094424A priority Critical patent/JPS57208642A/ja
Priority to US06/388,505 priority patent/US4503324A/en
Priority to NL8202435A priority patent/NL8202435A/nl
Publication of JPS57208642A publication Critical patent/JPS57208642A/ja
Publication of JPH0316694B2 publication Critical patent/JPH0316694B2/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
    • G11B7/0948—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 specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
    • 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)
JP56094424A 1981-06-18 1981-06-18 Focus controller Granted JPS57208642A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP56094424A JPS57208642A (en) 1981-06-18 1981-06-18 Focus controller
US06/388,505 US4503324A (en) 1981-06-18 1982-06-14 Automatic focusing device
NL8202435A NL8202435A (nl) 1981-06-18 1982-06-16 Automatische focusseerinrichting.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56094424A JPS57208642A (en) 1981-06-18 1981-06-18 Focus controller

Publications (2)

Publication Number Publication Date
JPS57208642A true JPS57208642A (en) 1982-12-21
JPH0316694B2 JPH0316694B2 (ja) 1991-03-06

Family

ID=14109841

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56094424A Granted JPS57208642A (en) 1981-06-18 1981-06-18 Focus controller

Country Status (3)

Country Link
US (1) US4503324A (ja)
JP (1) JPS57208642A (ja)
NL (1) NL8202435A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169706A (ja) * 1984-02-14 1985-09-03 Olympus Optical Co Ltd 表面形状測定装置
JPS6448226A (en) * 1987-08-19 1989-02-22 Hitachi Ltd Optical disk device
US4890274A (en) * 1985-04-16 1989-12-26 Olympus Optical Co., Ltd. Optical information recording and reproducing apparatus
JPH0268318U (ja) * 1988-11-15 1990-05-23

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59157854A (ja) * 1983-02-28 1984-09-07 Sony Corp 光学式デイスク・プレ−ヤ−の制御装置
JPS59167858A (ja) * 1983-03-15 1984-09-21 Toshiba Corp 光学ヘツド
US4636625A (en) * 1984-09-06 1987-01-13 Ricoh Company, Ltd. Method and device for detecting focal point
US4774615A (en) * 1987-02-17 1988-09-27 Eastman Kodak Company Magneto-optic read-out method and apparatus with polarization correction means
JPS63228421A (ja) * 1987-03-17 1988-09-22 Minolta Camera Co Ltd 自動合焦装置
JPH01217731A (ja) * 1988-02-25 1989-08-31 Canon Inc 光学的情報記録再生装置
US4972075A (en) * 1988-08-02 1990-11-20 Minolta Camera Kabushiki Kaisha Automatic focusing system with dual diffraction gratings and converging means
US5062094A (en) * 1988-11-07 1991-10-29 Minolta Camera Kabushiki Kaisha Optical head for optical disk system
JPH0369025A (ja) * 1989-08-07 1991-03-25 Oki Electric Ind Co Ltd 光ディスク装置の焦点調整方法
US6285636B1 (en) * 1999-01-27 2001-09-04 Texas Instruments Incorporated Optical disc apparatus with lens position detection and control
JP2003203366A (ja) * 2002-01-09 2003-07-18 Texas Instr Japan Ltd 光ディスク用サーボエラー検出装置
TWI369508B (en) * 2006-12-12 2012-08-01 Nat Applied Res Laboratories Automatic focus device and method thereof
US8638437B2 (en) 2008-02-14 2014-01-28 J.A. Woollam Co., Inc. System and method of aligning a sample
US8064055B2 (en) * 2008-02-14 2011-11-22 J.A. Woollam Co., Inc. System and method of aligning a sample
US8983787B1 (en) 2008-12-12 2015-03-17 Martin M. Liphardt Method of evaluating data quality

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53100203A (en) * 1977-02-15 1978-09-01 Mitsubishi Electric Corp Optical reproducer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2251876B1 (ja) * 1973-11-16 1977-09-23 Thomson Brandt
US4079247A (en) * 1975-05-16 1978-03-14 Claude Bricot Optical focussing device
JPS54124705A (en) * 1978-03-20 1979-09-27 Teac Corp Optical reproducer
NL7904724A (nl) * 1979-06-18 1980-12-22 Philips Nv Optische aftastinrichting met fokusseerstelsel.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53100203A (en) * 1977-02-15 1978-09-01 Mitsubishi Electric Corp Optical reproducer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169706A (ja) * 1984-02-14 1985-09-03 Olympus Optical Co Ltd 表面形状測定装置
JPH056643B2 (ja) * 1984-02-14 1993-01-27 Olympus Optical Co
US4890274A (en) * 1985-04-16 1989-12-26 Olympus Optical Co., Ltd. Optical information recording and reproducing apparatus
JPS6448226A (en) * 1987-08-19 1989-02-22 Hitachi Ltd Optical disk device
USRE39013E1 (en) 1987-08-19 2006-03-14 Hitachi, Ltd. Method and apparatus for optical recording and reproducing with tracking servo reducing track offset
JPH0268318U (ja) * 1988-11-15 1990-05-23

Also Published As

Publication number Publication date
US4503324A (en) 1985-03-05
JPH0316694B2 (ja) 1991-03-06
NL8202435A (nl) 1983-01-17

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