DE68914615D1 - Fokusfehlerermittlungsschaltung. - Google Patents

Fokusfehlerermittlungsschaltung.

Info

Publication number
DE68914615D1
DE68914615D1 DE68914615T DE68914615T DE68914615D1 DE 68914615 D1 DE68914615 D1 DE 68914615D1 DE 68914615 T DE68914615 T DE 68914615T DE 68914615 T DE68914615 T DE 68914615T DE 68914615 D1 DE68914615 D1 DE 68914615D1
Authority
DE
Germany
Prior art keywords
detection circuit
error detection
focus error
focus
circuit
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 - Fee Related
Application number
DE68914615T
Other languages
English (en)
Other versions
DE68914615T2 (de
Inventor
Hitoshi Okada
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Application granted granted Critical
Publication of DE68914615D1 publication Critical patent/DE68914615D1/de
Publication of DE68914615T2 publication Critical patent/DE68914615T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
DE68914615T 1988-12-14 1989-12-12 Fokusfehlerermittlungsschaltung. Expired - Fee Related DE68914615T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63315673A JP2701392B2 (ja) 1988-12-14 1988-12-14 フオーカスエラー検出回路

Publications (2)

Publication Number Publication Date
DE68914615D1 true DE68914615D1 (de) 1994-05-19
DE68914615T2 DE68914615T2 (de) 1994-10-06

Family

ID=18068195

Family Applications (1)

Application Number Title Priority Date Filing Date
DE68914615T Expired - Fee Related DE68914615T2 (de) 1988-12-14 1989-12-12 Fokusfehlerermittlungsschaltung.

Country Status (5)

Country Link
US (1) US4992652A (de)
EP (1) EP0373607B1 (de)
JP (1) JP2701392B2 (de)
KR (1) KR0175292B1 (de)
DE (1) DE68914615T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2613118B2 (ja) * 1990-04-10 1997-05-21 富士写真フイルム株式会社 共焦点走査型顕微鏡
JP2716569B2 (ja) * 1990-04-25 1998-02-18 パイオニア株式会社 光学式情報読取り装置
JP2954404B2 (ja) * 1991-10-09 1999-09-27 株式会社日本コンラックス 光学的情報記録再生装置
US6252835B1 (en) 1996-09-19 2001-06-26 L G Electronics Inc Apparatus for automatically adjusting focus offset and method thereof in a disc player
KR100447663B1 (ko) * 1996-09-19 2004-11-08 엘지전자 주식회사 Cdp포커스오프셋자동조정장치및그방법
DE602005009722D1 (de) * 2004-08-27 2008-10-23 Koninkl Philips Electronics Nv System zum beschriften eines sichtbaren etiketts
JP2006185481A (ja) * 2004-12-27 2006-07-13 Toshiba Corp 光ディスク記録再生装置およびオフセット補正方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2271590B1 (de) * 1974-01-15 1978-12-01 Thomson Brandt
JPS5877036A (ja) * 1981-10-30 1983-05-10 Olympus Optical Co Ltd ピット中心検出方法
JPS58121139A (ja) * 1982-01-11 1983-07-19 Olympus Optical Co Ltd 自動フオ−カス制御装置
JPS58199307A (ja) * 1982-05-18 1983-11-19 Olympus Optical Co Ltd 合焦検出装置
JPS58208944A (ja) * 1982-05-31 1983-12-05 Sony Corp 光学ヘツド制御信号発生装置
JPS6070924U (ja) * 1983-10-19 1985-05-20 パイオニア株式会社 焦点誤差検出装置
JPS60119642A (ja) * 1983-11-30 1985-06-27 Ricoh Co Ltd 光情報記録再生装置
JPS60185230A (ja) * 1984-03-02 1985-09-20 Pioneer Electronic Corp 焦点誤差検出装置
DE3678311D1 (de) * 1985-02-15 1991-05-02 Hitachi Ltd Optisches plattengeraet.
DE3723923A1 (de) * 1987-05-09 1988-11-24 Thomson Brandt Gmbh Geraet zur wiedergabe von daten

Also Published As

Publication number Publication date
EP0373607A2 (de) 1990-06-20
KR0175292B1 (ko) 1999-04-15
DE68914615T2 (de) 1994-10-06
US4992652A (en) 1991-02-12
KR900010691A (ko) 1990-07-09
JPH02161623A (ja) 1990-06-21
JP2701392B2 (ja) 1998-01-21
EP0373607B1 (de) 1994-04-13
EP0373607A3 (de) 1991-08-07

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee