GB1573021A - Symmetrical astigmatic focus sensting system - Google Patents

Symmetrical astigmatic focus sensting system Download PDF

Info

Publication number
GB1573021A
GB1573021A GB54205/76A GB5420576A GB1573021A GB 1573021 A GB1573021 A GB 1573021A GB 54205/76 A GB54205/76 A GB 54205/76A GB 5420576 A GB5420576 A GB 5420576A GB 1573021 A GB1573021 A GB 1573021A
Authority
GB
United Kingdom
Prior art keywords
track
reading
path
spot
images
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
GB54205/76A
Other languages
English (en)
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 GB1573021A publication Critical patent/GB1573021A/en
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)
  • Automatic Focus Adjustment (AREA)
GB54205/76A 1975-12-31 1976-12-29 Symmetrical astigmatic focus sensting system Expired GB1573021A (en)

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 (1)

Publication Number Publication Date
GB1573021A true GB1573021A (en) 1980-08-13

Family

ID=24589236

Family Applications (1)

Application Number Title Priority Date Filing Date
GB54205/76A Expired GB1573021A (en) 1975-12-31 1976-12-29 Symmetrical astigmatic focus sensting system

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)

Families Citing this family (28)

* 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
FR2498341A1 (fr) * 1981-01-20 1982-07-23 Thomson Csf Dispositif optique detecteur d'ecart de focalisation et enregistreur lecteur optique comportant un tel dispositif
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
FR2536568A1 (fr) * 1982-11-18 1984-05-25 Sony Corp Appareil de detection de la position d'un lecteur optique
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

Also Published As

Publication number Publication date
CA1073255A (en) 1980-03-11
US4025949A (en) 1977-05-24
FR2337473A1 (fr) 1977-07-29
JPS608535B2 (ja) 1985-03-04
DE2659618C2 (de) 1986-08-28
FR2337473B1 (enExample) 1980-08-29
IT1065693B (it) 1985-03-04
JPS5285801A (en) 1977-07-16
DE2659618A1 (de) 1977-07-14

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19961228