FR2337473A1 - Systeme de detection d'ecart de focalisation et lecteur optique video utilisant un tel systeme - Google Patents

Systeme de detection d'ecart de focalisation et lecteur optique video utilisant un tel systeme

Info

Publication number
FR2337473A1
FR2337473A1 FR7637334A FR7637334A FR2337473A1 FR 2337473 A1 FR2337473 A1 FR 2337473A1 FR 7637334 A FR7637334 A FR 7637334A FR 7637334 A FR7637334 A FR 7637334A FR 2337473 A1 FR2337473 A1 FR 2337473A1
Authority
FR
France
Prior art keywords
deviation detection
focus deviation
optical video
detection system
video reader
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.)
Granted
Application number
FR7637334A
Other languages
English (en)
French (fr)
Other versions
FR2337473B1 (enExample
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.)
Thomson-Brandt SA
Original Assignee
Thomson-Brandt SA
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 Thomson-Brandt SA filed Critical Thomson-Brandt SA
Publication of FR2337473A1 publication Critical patent/FR2337473A1/fr
Application granted granted Critical
Publication of FR2337473B1 publication Critical patent/FR2337473B1/fr
Granted 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
FR7637334A 1975-12-31 1976-12-10 Systeme de detection d'ecart de focalisation et lecteur optique video utilisant un tel systeme Granted FR2337473A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/645,490 US4025949A (en) 1975-12-31 1975-12-31 Symmetrical astigmatic focus sensing system

Publications (2)

Publication Number Publication Date
FR2337473A1 true FR2337473A1 (fr) 1977-07-29
FR2337473B1 FR2337473B1 (enExample) 1980-08-29

Family

ID=24589236

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7637334A Granted FR2337473A1 (fr) 1975-12-31 1976-12-10 Systeme de detection d'ecart de focalisation et lecteur optique video utilisant un tel systeme

Country Status (7)

Country Link
US (1) US4025949A (enExample)
JP (1) JPS608535B2 (enExample)
CA (1) CA1073255A (enExample)
DE (1) DE2659618C2 (enExample)
FR (1) FR2337473A1 (enExample)
GB (1) GB1573021A (enExample)
IT (1) IT1065693B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057339A1 (fr) * 1981-01-20 1982-08-11 Thomson-Csf Dispositif optique détecteur d'écart de focalisation et enregistreur-lecteur optique comportant un tel dispositif
FR2536568A1 (fr) * 1982-11-18 1984-05-25 Sony Corp Appareil de detection de la position d'un lecteur optique

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325987A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Dispositif de lecture optique d'un enregistrement
JPS5266405A (en) * 1975-11-29 1977-06-01 Victor Co Of Japan Ltd Optical recording system of information recording discs
GB1532345A (en) * 1976-06-25 1978-11-15 Hitachi Ltd Information play-back apparatus
NL7703077A (nl) * 1977-03-22 1978-09-26 Philips Nv Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager.
CA1131361A (en) * 1977-05-11 1982-09-07 Fumitaka Kotaka Focus servo device for use in optical read-out device of information
US4223348A (en) * 1977-09-12 1980-09-16 Olympus Optical Co., Ltd. Automatic focussing device
JPS54155832A (en) * 1978-05-30 1979-12-08 Canon Inc Focusing detector
JPS55927A (en) * 1978-06-16 1980-01-07 Pioneer Video Corp Focus servo unit of optical information reader
JPS6038771B2 (ja) * 1978-06-19 1985-09-03 パイオニア株式会社 光学式情報読取装置のサ−ボ装置
NL7907216A (nl) * 1979-09-28 1981-03-31 Philips Nv Optisch fokusfout-detektiestelsel.
NL8004892A (nl) * 1980-08-29 1982-04-01 Philips Nv Inrichting voor het verwerken van optische informatie en werkwijze voor het vervaardigen van een coma-correctieplaat zoals toegepast in een dergelijke inrichting.
JPS5744236A (en) * 1980-08-29 1982-03-12 Matsushita Electric Ind Co Ltd Optical information reproducer
JPS5774837A (en) * 1980-10-25 1982-05-11 Olympus Optical Co Ltd Signal detection system of optical information reproducing device
FR2502800A1 (fr) * 1981-03-24 1982-10-01 Thomson Csf Senseur optique d'asservissement de focalisation
US4458144A (en) * 1981-06-30 1984-07-03 Storage Technology Corporation Apparatus for reading information stored in a track pattern on a radiation reflecting record
NL8105579A (nl) * 1981-12-11 1983-07-01 Philips Nv Optisch fokusfoutdetektiestelsel.
JPS58220250A (ja) * 1982-06-16 1983-12-21 Ricoh Co Ltd 自動焦点合せ光学系
JPS58193335U (ja) * 1982-06-17 1983-12-22 パイオニア株式会社 フオ−カスエラ−検出装置
JPS6077022U (ja) * 1983-11-01 1985-05-29 パイオニア株式会社 焦点誤差検出装置
DE3340009A1 (de) * 1983-11-04 1985-05-15 Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., 3400 Göttingen Verfahren und einrichtung zum ermitteln des fokussierungszustandes eines abbildenden teilchenoptischen geraetes
JPS60185230A (ja) * 1984-03-02 1985-09-20 Pioneer Electronic Corp 焦点誤差検出装置
US4799210A (en) * 1986-11-05 1989-01-17 Unisys Corporation Fiber optic read/write head for an optical disk memory system
US5353272A (en) * 1992-12-29 1994-10-04 Eastman Kodak Company Apparatus and method for a modified half-aperture focus/tracking/data sensor system
DE19726581C5 (de) * 1997-06-23 2010-02-04 Sick Ag Verfahren zur Bestimmung der Fokuslage einer optoelektronischen Vorrichtung
DE102009049167A1 (de) * 2009-10-12 2011-05-05 Imos Gubela Gmbh Sicherheitslupe zur Vergrößerung und zur Vermeidung des Brennglaseffektes
US10001622B2 (en) * 2011-10-25 2018-06-19 Sanford Burnham Medical Research Institute Multifunction autofocus system and method for automated microscopy

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596101A (en) * 1969-11-05 1971-07-27 Canon Kk Optical systems for automatic focusing apparatus
FR2266932B1 (enExample) * 1973-03-02 1977-09-02 Thomson Brandt
JPS5016423A (enExample) * 1973-06-11 1975-02-21
FR2235448B1 (enExample) * 1973-06-29 1976-05-07 Thomson Brandt
FR2271590B1 (enExample) * 1974-01-15 1978-12-01 Thomson Brandt
NL7414776A (nl) * 1974-11-13 1976-05-17 Philips Nv Inrichting voor het uitlezen van een registra- tiedrager met een optische informatiestruktuur.
US3983317A (en) * 1974-12-09 1976-09-28 Teletype Corporation Astigmatizer for laser recording and reproducing system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057339A1 (fr) * 1981-01-20 1982-08-11 Thomson-Csf Dispositif optique détecteur d'écart de focalisation et enregistreur-lecteur optique comportant un tel dispositif
FR2536568A1 (fr) * 1982-11-18 1984-05-25 Sony Corp Appareil de detection de la position d'un lecteur optique

Also Published As

Publication number Publication date
CA1073255A (en) 1980-03-11
US4025949A (en) 1977-05-24
JPS608535B2 (ja) 1985-03-04
DE2659618C2 (de) 1986-08-28
GB1573021A (en) 1980-08-13
FR2337473B1 (enExample) 1980-08-29
IT1065693B (it) 1985-03-04
JPS5285801A (en) 1977-07-16
DE2659618A1 (de) 1977-07-14

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