GB1462792A - Apparatus for reading video information - Google Patents

Apparatus for reading video information

Info

Publication number
GB1462792A
GB1462792A GB3912776A GB3912776A GB1462792A GB 1462792 A GB1462792 A GB 1462792A GB 3912776 A GB3912776 A GB 3912776A GB 3912776 A GB3912776 A GB 3912776A GB 1462792 A GB1462792 A GB 1462792A
Authority
GB
United Kingdom
Prior art keywords
video information
feb
laser
plate
video disc
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
GB3912776A
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.)
Discovision Associates
Original Assignee
MCA Discovision Inc
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 MCA Discovision Inc filed Critical MCA Discovision Inc
Priority claimed from GB702174A external-priority patent/GB1462791A/en
Publication of GB1462792A publication Critical patent/GB1462792A/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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/128—Modulators
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
    • G02F1/0327—Operation of the cell; Circuit arrangements
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/048—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using other optical storage elements

Abstract

1462792 Optical playback of video disc records MCA DISCO-VISION Inc 15 Feb 1974 [20 Feb 1973] 39127/76 Divided out of 1462791 Heading G5R A laser 52 emits a playback beam 54 which passes through a polarizing device 56, as shown a plane-polarizing beam-splitter, and a polarization-shifting plate 62, e.g. a quarter-wave plate, and is reflected from a video disc record 18 back through the plate 62 which by its double rotation action on the beam 54 prevents passage of the beam back through the polarizing device 56 to the laser 52.
GB3912776A 1973-02-20 1974-02-15 Apparatus for reading video information Expired GB1462792A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US33356073A 1973-02-20 1973-02-20
GB702174A GB1462791A (en) 1973-02-20 1974-02-15 Method and apparatus for recording video information

Publications (1)

Publication Number Publication Date
GB1462792A true GB1462792A (en) 1977-01-26

Family

ID=26241098

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3912776A Expired GB1462792A (en) 1973-02-20 1974-02-15 Apparatus for reading video information

Country Status (1)

Country Link
GB (1) GB1462792A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028111A1 (en) * 1979-10-22 1981-05-06 Discovision Associates Apparatus and method for optically recording an information signal with reduced second harmonic distortion and a record so made
DE3500646A1 (en) * 1984-01-11 1985-07-18 Canon Denshi K.K., Chichibu, Saitama RECORD TESTING DEVICE
US4989198A (en) * 1987-04-28 1991-01-29 Sharp Kabushiki Kaisha Beam control device utilizing beam having a specific direction of polarization to control a laser used in an optical memory system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028111A1 (en) * 1979-10-22 1981-05-06 Discovision Associates Apparatus and method for optically recording an information signal with reduced second harmonic distortion and a record so made
DE3500646A1 (en) * 1984-01-11 1985-07-18 Canon Denshi K.K., Chichibu, Saitama RECORD TESTING DEVICE
US4989198A (en) * 1987-04-28 1991-01-29 Sharp Kabushiki Kaisha Beam control device utilizing beam having a specific direction of polarization to control a laser used in an optical memory system

Similar Documents

Publication Publication Date Title
GB1146844A (en) Transducing system
SE7501465L (en)
GB1448239A (en) Apparatus arrnaged to play back recorded information
GB1372082A (en) Record and playback apparatus for pulse width modulated record
FR2399088A1 (en) APPARATUS AND METHOD FOR RESTITUTING A MODULE FREQUENCY SIGNAL STORED ON AN INFORMATION STORAGE ELEMENT
SE7510783L (en) OPTICAL MONITORING SERVICE AND CONTEMPORARY READING OF AN INFORMATION CHANNEL ON A VIDEO DISC
GB1285999A (en) Recorder and reproducer system
GB1453444A (en) Video and audio programme recording and reproducing system
GB1293776A (en) Erasing signals from magnetic discs
GB1408767A (en) Optical data storage devices
GB1362578A (en) Information storage systems
GB1462792A (en) Apparatus for reading video information
GB1283179A (en) Magnetic disk data storage device
GB1442218A (en) Rotating disc reader
GB1313227A (en) Information storage devices
ES396425A1 (en) Sound records and reproducing apparatus
ES427804A1 (en) Optical recording
GB1482267A (en) Reading head
GB1110810A (en) Apparatus for reproducing recorded information by beam scanning
GB1321676A (en) Holographic apparatus
GB1352569A (en) Recording and reproduction of sound
GB1490223A (en) Apparatus for optically reading a record carrier
GB1134049A (en) Turntable braking mechanism for recording apparatus
GB1372421A (en) Information record and apparatus for producing same
GB1363268A (en) Magnetic recording and/or reproducing apparatus

Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19940214