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ES8105876A1 - Un sistema optico de deteccion de error de enfoque - Google Patents

Un sistema optico de deteccion de error de enfoque

Info

Publication number
ES8105876A1
ES8105876A1 ES495326A ES495326A ES8105876A1 ES 8105876 A1 ES8105876 A1 ES 8105876A1 ES 495326 A ES495326 A ES 495326A ES 495326 A ES495326 A ES 495326A ES 8105876 A1 ES8105876 A1 ES 8105876A1
Authority
ES
Spain
Prior art keywords
error detection
detection system
radiation
reflecting surface
focussing
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
Application number
ES495326A
Other languages
English (en)
Other versions
ES495326A0 (es
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of ES495326A0 publication Critical patent/ES495326A0/es
Publication of ES8105876A1 publication Critical patent/ES8105876A1/es
Expired 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

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

ELEMENTO OPTICO, DEFLECTOR DEL HAZ DE RADIACION E INTRODUCTOR DE ASTIGMATISMO, QUE FORMA PARTE DE UN SISTEMA OPTIMO DE DETECCION DE ERROR DE ENFOQUE. CONSISTE EN UN PRISMA TRIANGULAR DE UN MATERIAL TRANSPARENTE, SITUADO ENTRE LA FUENTE DE RADIACION Y EL SISTEMA DE OBJETIVO E INCLINADO RESPECTO AL EJE PRINCIPAL DEL HAZ DE RADIACION. LA CARA MAS PROXIMA A LA FUENTE DE RADIACION ES PARCIALMENTE REFLECTORA Y PUEDE SER UN ESPEJO SEMITRANSPARENTE. LA OTRA CARA PUEDE ESTAR RECUBIERTA DE UNA CAPA REFLECTORA. EXISTEN VARIANTES DE FORMA Y REALIZACION.
ES495326A 1979-09-28 1980-09-25 Un sistema optico de deteccion de error de enfoque Expired ES8105876A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7907216A NL7907216A (nl) 1979-09-28 1979-09-28 Optisch fokusfout-detektiestelsel.

Publications (2)

Publication Number Publication Date
ES495326A0 ES495326A0 (es) 1981-06-01
ES8105876A1 true ES8105876A1 (es) 1981-06-01

Family

ID=19833932

Family Applications (1)

Application Number Title Priority Date Filing Date
ES495326A Expired ES8105876A1 (es) 1979-09-28 1980-09-25 Un sistema optico de deteccion de error de enfoque

Country Status (10)

Country Link
US (1) US4358200A (es)
JP (1) JPS5657013A (es)
AU (1) AU6270980A (es)
CA (1) CA1144792A (es)
DE (1) DE3035719A1 (es)
ES (1) ES8105876A1 (es)
FR (1) FR2466787B1 (es)
GB (1) GB2059057B (es)
IT (1) IT1132757B (es)
NL (1) NL7907216A (es)

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JP2634797B2 (ja) * 1986-01-24 1997-07-30 日本電気株式会社 光ヘッド装置
JPH0630164B2 (ja) * 1985-12-16 1994-04-20 キヤノン株式会社 光ヘツド装置
FR2597249B1 (fr) * 1986-04-11 1988-06-17 Thomson Csf Dispositif de lecture optique de support d'enregistrement optique
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JP2975466B2 (ja) * 1991-11-18 1999-11-10 パイオニア株式会社 光学式情報再生装置
JP3246608B2 (ja) * 1991-11-18 2002-01-15 パイオニア株式会社 光学式情報再生装置
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Also Published As

Publication number Publication date
GB2059057B (en) 1983-09-21
FR2466787B1 (fr) 1986-03-28
JPH028379B2 (es) 1990-02-23
CA1144792A (en) 1983-04-19
NL7907216A (nl) 1981-03-31
GB2059057A (en) 1981-04-15
IT8024923A0 (it) 1980-09-25
ES495326A0 (es) 1981-06-01
JPS5657013A (en) 1981-05-19
US4358200A (en) 1982-11-09
DE3035719A1 (de) 1981-04-09
FR2466787A1 (fr) 1981-04-10
AU6270980A (en) 1981-04-09
IT1132757B (it) 1986-07-02
DE3035719C2 (es) 1989-03-09

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