FR2336761A1 - Video disc player scanning system - has deflector providing coherent beam with selected optical axis - Google Patents

Video disc player scanning system - has deflector providing coherent beam with selected optical axis

Info

Publication number
FR2336761A1
FR2336761A1 FR7539751A FR7539751A FR2336761A1 FR 2336761 A1 FR2336761 A1 FR 2336761A1 FR 7539751 A FR7539751 A FR 7539751A FR 7539751 A FR7539751 A FR 7539751A FR 2336761 A1 FR2336761 A1 FR 2336761A1
Authority
FR
France
Prior art keywords
optical axis
coherent beam
deflector
scanning system
optical
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
FR7539751A
Other languages
French (fr)
Other versions
FR2336761B1 (en
Inventor
Claude Puech
Francois Le Carvennec
Jean-Pierre Huignard
Jean-Pierre Herriau
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 FR7539751A priority Critical patent/FR2336761A1/en
Publication of FR2336761A1 publication Critical patent/FR2336761A1/en
Application granted granted Critical
Publication of FR2336761B1 publication Critical patent/FR2336761B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/7605—Television signal recording on discs or drums
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/106—Scanning systems having diffraction gratings as scanning elements, e.g. holographic scanners
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • 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
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/89—Television signal recording using holographic recording
    • H04N5/90—Television signal recording using holographic recording on discs or drums

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)

Abstract

The optical scanning system employs a laser light source (1). An optical deflector (3), receives the light from the source and provides a coherent beam with an optical axis lying along one of several predetermined directions. The selected optical axis is determined by a control signal supplied to the deflector (3). This has a pre-recorded hologram (6) and provides a read-out beam focussed on a given point along the optical axis of the read-out beam, depending on the optical axis of the coherent beam. Pref. the deflector (3) comprises an acousto-optical transducer receiving a variable frequency control signal to determine the direction of the coherent beam.
FR7539751A 1975-12-24 1975-12-24 Video disc player scanning system - has deflector providing coherent beam with selected optical axis Granted FR2336761A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7539751A FR2336761A1 (en) 1975-12-24 1975-12-24 Video disc player scanning system - has deflector providing coherent beam with selected optical axis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7539751A FR2336761A1 (en) 1975-12-24 1975-12-24 Video disc player scanning system - has deflector providing coherent beam with selected optical axis

Publications (2)

Publication Number Publication Date
FR2336761A1 true FR2336761A1 (en) 1977-07-22
FR2336761B1 FR2336761B1 (en) 1980-04-04

Family

ID=9164169

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7539751A Granted FR2336761A1 (en) 1975-12-24 1975-12-24 Video disc player scanning system - has deflector providing coherent beam with selected optical axis

Country Status (1)

Country Link
FR (1) FR2336761A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5894465A (en) * 1997-01-07 1999-04-13 Rrad-Rite Corporation Transmissive data storage media and an optical head using holographic or acousto-optical deflection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5894465A (en) * 1997-01-07 1999-04-13 Rrad-Rite Corporation Transmissive data storage media and an optical head using holographic or acousto-optical deflection

Also Published As

Publication number Publication date
FR2336761B1 (en) 1980-04-04

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Legal Events

Date Code Title Description
ST Notification of lapse