FR2311326B2 - - Google Patents

Info

Publication number
FR2311326B2
FR2311326B2 FR7515433A FR7515433A FR2311326B2 FR 2311326 B2 FR2311326 B2 FR 2311326B2 FR 7515433 A FR7515433 A FR 7515433A FR 7515433 A FR7515433 A FR 7515433A FR 2311326 B2 FR2311326 B2 FR 2311326B2
Authority
FR
France
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
FR7515433A
Other versions
FR2311326A2 (fr
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
Priority claimed from FR7401283A external-priority patent/FR2271590B1/fr
Application filed by Thomson-Brandt SA filed Critical Thomson-Brandt SA
Priority to FR7515433A priority Critical patent/FR2311326A2/fr
Priority to US05/684,355 priority patent/US4079247A/en
Priority to GB19844/76A priority patent/GB1557210A/en
Priority to DE19762621319 priority patent/DE2621319C2/de
Priority to IT23270/76A priority patent/IT1062979B/it
Priority to JP51056426A priority patent/JPS6048949B2/ja
Publication of FR2311326A2 publication Critical patent/FR2311326A2/fr
Application granted granted Critical
Publication of FR2311326B2 publication Critical patent/FR2311326B2/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Recording Or Reproduction (AREA)
FR7515433A 1974-01-15 1975-05-16 Dispositif de focalisation et lecteur optique comportant un tel dispositif Granted FR2311326A2 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR7515433A FR2311326A2 (fr) 1974-01-15 1975-05-16 Dispositif de focalisation et lecteur optique comportant un tel dispositif
US05/684,355 US4079247A (en) 1975-05-16 1976-05-07 Optical focussing device
GB19844/76A GB1557210A (en) 1975-05-16 1976-05-13 Optical focusing device
DE19762621319 DE2621319C2 (de) 1974-01-15 1976-05-13 Einrichtung zum Fokussieren eines Leselichtbündels auf einen teilweise reflektierenden oder teilweise transparenten Informationsträger
IT23270/76A IT1062979B (it) 1975-05-16 1976-05-14 Dispositivo di focalizzazione e lettura ottica comportante un siffatto dispositivo
JP51056426A JPS6048949B2 (ja) 1975-05-16 1976-05-17 光ビームで情報を読み取る装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7401283A FR2271590B1 (fr) 1974-01-15 1974-01-15
FR7515433A FR2311326A2 (fr) 1974-01-15 1975-05-16 Dispositif de focalisation et lecteur optique comportant un tel dispositif

Publications (2)

Publication Number Publication Date
FR2311326A2 FR2311326A2 (fr) 1976-12-10
FR2311326B2 true FR2311326B2 (fr) 1979-01-05

Family

ID=26218134

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7515433A Granted FR2311326A2 (fr) 1974-01-15 1975-05-16 Dispositif de focalisation et lecteur optique comportant un tel dispositif

Country Status (2)

Country Link
DE (1) DE2621319C2 (fr)
FR (1) FR2311326A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8105579A (nl) * 1981-12-11 1983-07-01 Philips Nv Optisch fokusfoutdetektiestelsel.
FR2528605B1 (fr) * 1982-06-15 1987-11-20 Thomson Csf Procede et dispositif optique de focalisation d'un faisceau d'energie lumineuse sur un plan de reference d'un support d'information ainsi que ce support
JPS59221835A (ja) * 1983-05-31 1984-12-13 Sony Corp フオ−カス誤差検出装置
JPS629537A (ja) * 1985-07-08 1987-01-17 Pioneer Electronic Corp 光学式ピツクアツプ装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2212070A6 (fr) * 1972-08-25 1974-07-19 Thomson Csf

Also Published As

Publication number Publication date
FR2311326A2 (fr) 1976-12-10
DE2621319A1 (de) 1976-11-25
DE2621319C2 (de) 1982-04-15

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