NL7907216A - Optisch fokusfout-detektiestelsel. - Google Patents

Optisch fokusfout-detektiestelsel. Download PDF

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Publication number
NL7907216A
NL7907216A NL7907216A NL7907216A NL7907216A NL 7907216 A NL7907216 A NL 7907216A NL 7907216 A NL7907216 A NL 7907216A NL 7907216 A NL7907216 A NL 7907216A NL 7907216 A NL7907216 A NL 7907216A
Authority
NL
Netherlands
Prior art keywords
radiation
plate
plane
read
detector
Prior art date
Application number
NL7907216A
Other languages
English (en)
Dutch (nl)
Original Assignee
Philips 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 Nv filed Critical Philips Nv
Priority to NL7907216A priority Critical patent/NL7907216A/nl
Priority to US06/109,732 priority patent/US4358200A/en
Priority to DE19803035719 priority patent/DE3035719A1/de
Priority to GB8030828A priority patent/GB2059057B/en
Priority to FR8020505A priority patent/FR2466787B1/fr
Priority to AU62709/80A priority patent/AU6270980A/en
Priority to CA000361447A priority patent/CA1144792A/en
Priority to JP13243180A priority patent/JPS5657013A/ja
Priority to ES495326A priority patent/ES8105876A1/es
Priority to IT24923/80A priority patent/IT1132757B/it
Publication of NL7907216A publication Critical patent/NL7907216A/nl

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)
NL7907216A 1979-09-28 1979-09-28 Optisch fokusfout-detektiestelsel. NL7907216A (nl)

Priority Applications (10)

Application Number Priority Date Filing Date Title
NL7907216A NL7907216A (nl) 1979-09-28 1979-09-28 Optisch fokusfout-detektiestelsel.
US06/109,732 US4358200A (en) 1979-09-28 1980-01-04 Optical focussing-error detection system
DE19803035719 DE3035719A1 (de) 1979-09-28 1980-09-22 Optisches fokusfehlerdetektionssystem
GB8030828A GB2059057B (en) 1979-09-28 1980-09-24 Photo-electric focussing error detection
FR8020505A FR2466787B1 (fr) 1979-09-28 1980-09-24 Systeme optique pour la detection de defauts de focalisation
AU62709/80A AU6270980A (en) 1979-09-28 1980-09-25 Optical focussing - error detection system
CA000361447A CA1144792A (en) 1979-09-28 1980-09-25 Optical focussing-error detection system
JP13243180A JPS5657013A (en) 1979-09-28 1980-09-25 Focus error detector
ES495326A ES8105876A1 (es) 1979-09-28 1980-09-25 Un sistema optico de deteccion de error de enfoque
IT24923/80A IT1132757B (it) 1979-09-28 1980-09-25 Impianto ed apparecchiatura di revelazione degli errori di messa a fuoco ottica

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7907216 1979-09-28
NL7907216A NL7907216A (nl) 1979-09-28 1979-09-28 Optisch fokusfout-detektiestelsel.

Publications (1)

Publication Number Publication Date
NL7907216A true NL7907216A (nl) 1981-03-31

Family

ID=19833932

Family Applications (1)

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

Country Status (10)

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

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JPH0750532B2 (ja) * 1986-05-26 1995-05-31 日本電気株式会社 光ヘツド装置
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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DE3785118T2 (de) * 1986-09-02 1993-07-08 Fuji Photo Film Co Ltd Optischer wiedergabekopf.
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JPS63153732A (ja) * 1986-12-18 1988-06-27 Canon Electronics Inc 焦点検出装置
JPH0675307B2 (ja) * 1987-01-30 1994-09-21 富士写真フイルム株式会社 光磁気記録媒体用ピツクアツプ
JPH06101138B2 (ja) * 1987-03-19 1994-12-12 松下電器産業株式会社 光ヘツド装置
US4879706A (en) * 1987-07-29 1989-11-07 Laser Magnetic Storage International Company Method and apparatus for focus and tracking in an optical disk system
EP0539354B1 (en) * 1987-08-24 1997-06-04 Sharp Kabushiki Kaisha Optical pickup apparatus
EP0339722B1 (en) * 1988-04-26 1993-10-06 Koninklijke Philips Electronics N.V. Arrangement for optically scanning a magneto-optical carrier
US5066138A (en) * 1988-06-16 1991-11-19 Mitsubishi Denki Kabushiki Kaisha Optical head apparatus
NL8901245A (nl) * 1989-05-19 1990-12-17 Philips Nv Retrofokus objektieflens en optische aftastinrichting voorzien van een dergelijke lens.
CA2012401C (en) * 1989-05-26 1994-05-10 Anthony G. Dewey Focus-error detection using prism-enhanced spot size monitoring
JPH02311816A (ja) * 1989-05-27 1990-12-27 Sharp Corp ビーム変換装置
US5233444A (en) * 1989-07-25 1993-08-03 Olympus Optical Co., Ltd. Focus error detecting apparatus
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JP2684822B2 (ja) * 1990-06-06 1997-12-03 松下電器産業株式会社 光ピックアップヘッド装置
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US5245174A (en) * 1990-10-15 1993-09-14 Applied Magnetics Corporation Focus sensing apparatus utilizing a reflecting surface having variable reflectivity
JP2865223B2 (ja) * 1990-12-28 1999-03-08 松下電子工業株式会社 光ピックアップ用偏光板および光ピックアップ装置
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Also Published As

Publication number Publication date
IT1132757B (it) 1986-07-02
GB2059057A (en) 1981-04-15
DE3035719A1 (de) 1981-04-09
ES495326A0 (es) 1981-06-01
ES8105876A1 (es) 1981-06-01
FR2466787A1 (fr) 1981-04-10
JPS5657013A (en) 1981-05-19
IT8024923A0 (it) 1980-09-25
FR2466787B1 (fr) 1986-03-28
US4358200A (en) 1982-11-09
CA1144792A (en) 1983-04-19
GB2059057B (en) 1983-09-21
DE3035719C2 (pt) 1989-03-09
AU6270980A (en) 1981-04-09
JPH028379B2 (pt) 1990-02-23

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A1B A search report has been drawn up
A85 Still pending on 85-01-01
BV The patent application has lapsed