ES2064763T3 - Regulacion automatica de enfoque. - Google Patents

Regulacion automatica de enfoque.

Info

Publication number
ES2064763T3
ES2064763T3 ES90913816T ES90913816T ES2064763T3 ES 2064763 T3 ES2064763 T3 ES 2064763T3 ES 90913816 T ES90913816 T ES 90913816T ES 90913816 T ES90913816 T ES 90913816T ES 2064763 T3 ES2064763 T3 ES 2064763T3
Authority
ES
Spain
Prior art keywords
focussing
recording medium
control loop
automatic approach
approach regulation
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
ES90913816T
Other languages
English (en)
Inventor
Friedhelm Zucker
Christian Buchler
Heinz-Jorg Schroder
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.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
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 Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Application granted granted Critical
Publication of ES2064763T3 publication Critical patent/ES2064763T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G11B7/0908—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
    • 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
    • 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

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Looms (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Eye Examination Apparatus (AREA)
  • Details Of Television Scanning (AREA)
  • Telescopes (AREA)
  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

ESTA INVENCION DESCRIBE UN DISPOSITIVO DE EXPLORACION OPTICA QUE EXPLORA LAS TRAYECTORIAS DE DATOS DE FRECUENCIA ULULADA DE UN MEDIO GRABADOR, REFLEJANDOSE EL RAYO DE LUZ DE EXPLORACION DESDE EL MEDIO DE GRABACION EN UN FOTODETECTOR DE CUATRO CUADRANTES (PD) CON CUATRO FOTODIODOS (A, B, C , D). PARA PODER COMPENSAR AUTOMATICAMENTE TENSIONES CONTRAPUESTAS PRODUCIDAS EN EL BUCLE DE CONTROL DE ENFOQUE, POR EJEMPLO POR FLUCTUACIONES DE TEMPERATURA, LA SEÑAL DE ENFOQUE, Y LA SEÑAL DE ERROR DE TRAYECTORIA, SE INTRODUCEN EN UN CIRCUITO MULTIPLICADOR (M). LA SALIDA DEL MULTIPLICADOR SE ALIMENTA A TRAVES DE UN FILTRO DE PASO INFERIOR (TP) Y COMO TENSION DE COMPENSACION PARA EL BUCLE DE CONTROL DE ENFOQUE.
ES90913816T 1989-10-28 1990-09-21 Regulacion automatica de enfoque. Expired - Lifetime ES2064763T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3936032A DE3936032A1 (de) 1989-10-28 1989-10-28 Fokusregelkreis

Publications (1)

Publication Number Publication Date
ES2064763T3 true ES2064763T3 (es) 1995-02-01

Family

ID=6392483

Family Applications (1)

Application Number Title Priority Date Filing Date
ES90913816T Expired - Lifetime ES2064763T3 (es) 1989-10-28 1990-09-21 Regulacion automatica de enfoque.

Country Status (14)

Country Link
EP (1) EP0500547B1 (es)
JP (1) JP2930715B2 (es)
KR (1) KR100251289B1 (es)
CN (1) CN1022518C (es)
AT (1) ATE114381T1 (es)
AU (1) AU6405190A (es)
DE (2) DE3936032A1 (es)
ES (1) ES2064763T3 (es)
FI (1) FI921879A0 (es)
HK (1) HK68795A (es)
HU (1) HU208588B (es)
MY (1) MY107278A (es)
TR (1) TR24658A (es)
WO (1) WO1991006949A1 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5978329A (en) * 1995-06-07 1999-11-02 Discovision Associates Technique for closed loop servo operation in optical disc tracking control
WO2002093568A1 (fr) * 2001-05-11 2002-11-21 Matsushita Electric Industrial Co., Ltd. Tete optique, enregistreur-lecteur de disque, et procede de pilotage d'un objectif
DE102005018461A1 (de) 2005-04-20 2006-10-26 Deutsche Thomson-Brandt Gmbh Fokusregelung für optischen Abtaster

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6070923U (ja) * 1983-10-19 1985-05-20 パイオニア株式会社 焦点誤差検出装置
JPS61269241A (ja) * 1985-05-24 1986-11-28 Sony Corp 光学ヘツド用焦点検出装置

Also Published As

Publication number Publication date
KR920704282A (ko) 1992-12-19
EP0500547A1 (de) 1992-09-02
JPH05501327A (ja) 1993-03-11
HU208588B (en) 1993-11-29
TR24658A (tr) 1992-03-01
HU9201300D0 (en) 1992-07-28
CN1051444A (zh) 1991-05-15
DE3936032A1 (de) 1991-05-02
AU6405190A (en) 1991-05-31
FI921879A (fi) 1992-04-27
DE59007781D1 (de) 1995-01-05
MY107278A (en) 1995-10-31
CN1022518C (zh) 1993-10-20
KR100251289B1 (ko) 2000-04-15
EP0500547B1 (de) 1994-11-23
FI921879A0 (fi) 1992-04-27
ATE114381T1 (de) 1994-12-15
HUT60874A (en) 1992-10-28
HK68795A (en) 1995-05-12
WO1991006949A1 (de) 1991-05-16
JP2930715B2 (ja) 1999-08-03

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