JPS57189348A - Auto-focus system of optical disk - Google Patents

Auto-focus system of optical disk

Info

Publication number
JPS57189348A
JPS57189348A JP56071341A JP7134181A JPS57189348A JP S57189348 A JPS57189348 A JP S57189348A JP 56071341 A JP56071341 A JP 56071341A JP 7134181 A JP7134181 A JP 7134181A JP S57189348 A JPS57189348 A JP S57189348A
Authority
JP
Japan
Prior art keywords
disk
focus
hpfs
reproducing
mirror
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.)
Pending
Application number
JP56071341A
Other languages
English (en)
Inventor
Kenji Kimura
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP56071341A priority Critical patent/JPS57189348A/ja
Priority to US06/375,305 priority patent/US4492856A/en
Priority to DE3218265A priority patent/DE3218265C2/de
Publication of JPS57189348A publication Critical patent/JPS57189348A/ja
Pending 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
    • G11B7/095—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 discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0956—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 discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G11B2007/0919—Critical angle methods
JP56071341A 1981-05-14 1981-05-14 Auto-focus system of optical disk Pending JPS57189348A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP56071341A JPS57189348A (en) 1981-05-14 1981-05-14 Auto-focus system of optical disk
US06/375,305 US4492856A (en) 1981-05-14 1982-05-05 Apparatus for effecting focus control for use in optical disc player
DE3218265A DE3218265C2 (de) 1981-05-14 1982-05-14 Fokussiereinrichtung für den Abtastlichtstrahl eines optischen Plattenspielers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56071341A JPS57189348A (en) 1981-05-14 1981-05-14 Auto-focus system of optical disk

Publications (1)

Publication Number Publication Date
JPS57189348A true JPS57189348A (en) 1982-11-20

Family

ID=13457696

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56071341A Pending JPS57189348A (en) 1981-05-14 1981-05-14 Auto-focus system of optical disk

Country Status (3)

Country Link
US (1) US4492856A (ja)
JP (1) JPS57189348A (ja)
DE (1) DE3218265C2 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008263834A (ja) * 2007-04-19 2008-11-06 Taiyo Kogyo Co Ltd 植物育成ユニットおよびそれを用いた多段式植物育成装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61177645A (ja) * 1985-01-31 1986-08-09 Fujitsu Ltd 焦点誤差制御装置
JPH01173441A (ja) * 1987-12-28 1989-07-10 Toshiba Corp 情報記録再生装置
DE4219311C2 (de) * 1991-06-13 1996-03-07 Sony Magnescale Inc Verschiebungsdetektor
US6285636B1 (en) * 1999-01-27 2001-09-04 Texas Instruments Incorporated Optical disc apparatus with lens position detection and control

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7708200A (nl) * 1976-07-28 1978-01-31 Hitachi Ltd Automatische scherpstellingsinrichting.
GB2057218B (en) * 1979-06-25 1984-02-29 Olympus Optical Co Detecting focussing error
US4358774A (en) * 1980-07-14 1982-11-09 Discovision Associates Apparatus and method for controlling focus in a recording system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008263834A (ja) * 2007-04-19 2008-11-06 Taiyo Kogyo Co Ltd 植物育成ユニットおよびそれを用いた多段式植物育成装置

Also Published As

Publication number Publication date
DE3218265C2 (de) 1985-11-28
DE3218265A1 (de) 1982-12-09
US4492856A (en) 1985-01-08

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