FR2335861A1 - Dispositif de focalisation et lecteur optique comportant un tel dispositif - Google Patents

Dispositif de focalisation et lecteur optique comportant un tel dispositif

Info

Publication number
FR2335861A1
FR2335861A1 FR7538495A FR7538495A FR2335861A1 FR 2335861 A1 FR2335861 A1 FR 2335861A1 FR 7538495 A FR7538495 A FR 7538495A FR 7538495 A FR7538495 A FR 7538495A FR 2335861 A1 FR2335861 A1 FR 2335861A1
Authority
FR
France
Prior art keywords
lens
projection system
point
objective
mirror
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
FR7538495A
Other languages
English (en)
French (fr)
Other versions
FR2335861B1 (enExample
Inventor
Claude Puech
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
Priority to FR7538495A priority Critical patent/FR2335861A1/fr
Publication of FR2335861A1 publication Critical patent/FR2335861A1/fr
Application granted granted Critical
Publication of FR2335861B1 publication Critical patent/FR2335861B1/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

Landscapes

  • Lenses (AREA)
FR7538495A 1975-12-16 1975-12-16 Dispositif de focalisation et lecteur optique comportant un tel dispositif Granted FR2335861A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7538495A FR2335861A1 (fr) 1975-12-16 1975-12-16 Dispositif de focalisation et lecteur optique comportant un tel dispositif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7538495A FR2335861A1 (fr) 1975-12-16 1975-12-16 Dispositif de focalisation et lecteur optique comportant un tel dispositif

Publications (2)

Publication Number Publication Date
FR2335861A1 true FR2335861A1 (fr) 1977-07-15
FR2335861B1 FR2335861B1 (enExample) 1978-08-18

Family

ID=9163795

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7538495A Granted FR2335861A1 (fr) 1975-12-16 1975-12-16 Dispositif de focalisation et lecteur optique comportant un tel dispositif

Country Status (1)

Country Link
FR (1) FR2335861A1 (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188276A1 (en) * 1985-01-16 1986-07-23 Hewlett-Packard Company Actuator apparatus for an optical data storage device
EP0213561A1 (de) * 1985-08-27 1987-03-11 Siemens Aktiengesellschaft Positioniereinrichtung für einen optischen Plattenspeicher

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2251876A1 (enExample) * 1973-11-16 1975-06-13 Thomson Brandt

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2251876A1 (enExample) * 1973-11-16 1975-06-13 Thomson Brandt

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188276A1 (en) * 1985-01-16 1986-07-23 Hewlett-Packard Company Actuator apparatus for an optical data storage device
EP0213561A1 (de) * 1985-08-27 1987-03-11 Siemens Aktiengesellschaft Positioniereinrichtung für einen optischen Plattenspeicher
US4768179A (en) * 1985-08-27 1988-08-30 Siemens Aktiengesellschaft Optical disc store scanning device with a plurality of scanning units

Also Published As

Publication number Publication date
FR2335861B1 (enExample) 1978-08-18

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Legal Events

Date Code Title Description
ST Notification of lapse