[go: up one dir, main page]

GB1462791A - Method and apparatus for recording video information - Google Patents

Method and apparatus for recording video information

Info

Publication number
GB1462791A
GB1462791A GB702174A GB702174A GB1462791A GB 1462791 A GB1462791 A GB 1462791A GB 702174 A GB702174 A GB 702174A GB 702174 A GB702174 A GB 702174A GB 1462791 A GB1462791 A GB 1462791A
Authority
GB
United Kingdom
Prior art keywords
recording
laser
record
reading
feb
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
GB702174A
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 to GB3912776A priority Critical patent/GB1462792A/en
Publication of GB1462791A publication Critical patent/GB1462791A/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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/1608—Error detection by comparing the output signals of redundant hardware
    • G06F11/1612—Error detection by comparing the output signals of redundant hardware where the redundant component is persistent storage
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/02—Analogue recording or reproducing
    • G11B20/06—Angle-modulation recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/22—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions
    • 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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • 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
    • G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements
    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Quality & Reliability (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Television Signal Processing For Recording (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

1462791 Television recording and playback MCA DISCO-VISION Inc 15 Feb 1974 [20 Feb 1973] 7021/74 Heading G5R A video recording made by a modulated laser beam is read by a second laser beam distinguished from the recording beam by having a different wavelength. As shown, a beam 40 from an argon ion laser 30 is modulated by video signals in a Pockels cell 32 and passes via a Glan prism 38 and a microscope objective lens 14 on an air bearing 16 to melt a pattern of holes in a bismuth film on a rotating record disc 18. A lower-power HeNe laser 52 sends a reading beam 54 through the same lens 14 at an angle to the recording beam so as to read the record about 2 Ám. downstream of the recording spot. A filter 66 stops any of the argon ion recording beam that may have been reflected from the record with the reading beam. The path of the reading beam includes a polarizing beam-splitter 56 and a quarter-wave plate 62, as described in Specification 1,462,792.
GB702174A 1973-02-20 1974-02-15 Method and apparatus for recording video information Expired GB1462791A (en)

Priority Applications (1)

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

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US33356073A 1973-02-20 1973-02-20

Publications (1)

Publication Number Publication Date
GB1462791A true GB1462791A (en) 1977-01-26

Family

ID=23303311

Family Applications (1)

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

Country Status (7)

Country Link
JP (12) JPS502415A (en)
CA (1) CA1013854A (en)
DE (6) DE2462835C2 (en)
FR (6) FR2218612B1 (en)
GB (1) GB1462791A (en)
IT (1) IT1008245B (en)
NL (5) NL7402289A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2951215A1 (en) * 1978-12-27 1980-07-03 Hitachi Ltd DEVICE FOR RECORDING INFORMATION
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
DE2949813A1 (en) * 1979-12-11 1981-06-19 Bts-Systementwicklungs Gmbh, 1000 Berlin DEVICE FOR RECORDING IMAGE AND SOUND INFORMATION PRESENT IN ELECTRICAL SIGNALS ON AN IMAGE DISK
EP0114082A2 (en) * 1983-01-14 1984-07-25 Koninklijke Philips Electronics N.V. Apparatus for recording and/or reading information by means of a radiation beam
EP0103994B1 (en) * 1982-08-23 1986-07-02 Hercules Incorporated Flavorings for sodium chloride substitutes
EP0102231B1 (en) * 1982-08-24 1988-11-02 Matsushita Electric Industrial Co., Ltd. Optical disk and method of recording and reproduction for the disk
EP0478989B1 (en) * 1990-10-01 1996-08-21 Blaupunkt-Werke GmbH Method of reading optical discs

Families Citing this family (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4225873A (en) * 1978-03-27 1980-09-30 Mca Disco-Vision, Inc. Recording and playback system
CA1074005A (en) * 1975-03-10 1980-03-18 James T. Russell Recording and playback system
AU520835B2 (en) * 1977-03-24 1982-03-04 World Development Laboratories Optical recording system and method
NL7802860A (en) * 1978-03-16 1979-09-18 Philips Nv REGISTRATION CARRIER BODY AND REGISTRATION CARRIER FOR OPTICAL INFORMATION AND DEVICE FOR REGISTRATION AND READ OUT.
EP0048041A3 (en) * 1978-03-27 1982-08-04 Discovision Associates Method and apparatus for writing a signal-information track by using a radiation beam
NL7901228A (en) * 1978-03-27 1979-10-01 Mca Disco Vision MOTHER MACHINE.
JPS54146613A (en) * 1978-05-10 1979-11-16 Hitachi Ltd Optical head
DK153609C (en) * 1978-09-22 1988-12-19 Discovision Ass PROCEDURE AND APPARATUS FOR WRITING A SIGNAL INFORMATION TRACK ON A PLATE
DK153610C (en) * 1978-09-22 1988-12-12 Discovision Ass PROCEDURE FOR WRITING A TRACK OF INFORMATION ON A PLATE
CH636212A5 (en) * 1978-10-17 1983-05-13 Mca Disco Vision Medium carrying recorded information
BE871326A (en) * 1978-10-23 1979-04-17 Mca Disco Vision METHOD AND DEVICE FOR RECORDING AND REPRODUCING A VIDEO SIGNAL.
JPS605926B2 (en) * 1978-11-22 1985-02-14 三菱電機株式会社 light modulator
US4264986A (en) * 1979-03-12 1981-04-28 Willis Craig I Information-recording process & apparatus
FR2453426A1 (en) * 1979-04-03 1980-10-31 Thomson Csf LIGHT INTENSITY MODULATOR IN INTEGRATED OPTICS AND INTEGRATED OPTICAL CIRCUIT COMPRISING SUCH A MODULATOR
FR2462758A1 (en) * 1979-08-03 1981-02-13 Thomson Csf OPTICAL DEVICE FOR ACCESSING A TRACK RUN BY AN INFORMATION CARRIER AND OPTICAL MEMORY SYSTEM COMPRISING SUCH A DEVICE
NL8101932A (en) * 1981-04-21 1982-11-16 Philips Nv DEVICE FOR RECORDING AND READING INFORMATION TRACKS IN AN OPTICAL RECORD CARRIER.
US4574371A (en) * 1982-02-20 1986-03-04 Olympus Optical Company Limited Apparatus for recording and reproducing information on an optical disc
JPS58147823A (en) * 1982-02-25 1983-09-02 Mitsubishi Electric Corp Detector of track shift
US4517667A (en) * 1982-06-10 1985-05-14 Xerox Corporation Direct read after write optical disk system
DE3303038C1 (en) * 1983-01-29 1983-11-24 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe Process for operating a filter unit for purifying air or gas streams and migrating bed filter unit for carrying out the process
JPS59191149A (en) * 1983-04-14 1984-10-30 Sanyo Electric Co Ltd Mechanism for controlling optical record
JPS59209042A (en) * 1983-05-12 1984-11-27 Yaskawa Electric Mfg Co Ltd Manufacture of laminated core of rotary electric machine with skew
JPS6096157A (en) * 1983-10-31 1985-05-29 Matsushita Electric Ind Co Ltd Rotor of squirrel-cage induction motor
JPS6129421A (en) * 1984-06-15 1986-02-10 Olympus Optical Co Ltd Detection of defect of optical recording medium
JPS61109239A (en) * 1984-11-01 1986-05-27 松下電工株式会社 Contact switch gear
JPS61184741A (en) * 1985-02-12 1986-08-18 Fujitsu Ltd optical recording and reproducing device
US4667256A (en) * 1985-11-25 1987-05-19 Eastman Kodak Company Circuit for electro-optic modulators
JPS62252876A (en) * 1986-04-23 1987-11-04 鹿島建設株式会社 freezer
JPH0614570B2 (en) * 1987-04-28 1994-02-23 シャープ株式会社 Optical output stabilizing method and photodetector used in the method
JPH0262734A (en) * 1988-08-30 1990-03-02 Hitachi Ltd Split type optical head
US5265079A (en) 1991-02-15 1993-11-23 Applied Magnetics Corporation Seek actuator for optical recording
US6141300A (en) 1989-06-20 2000-10-31 Discovision Associates Optical actuator including lens assembly with optical axis having symmetric suspensory forces acting thereon and optical disc system including same
US5729511A (en) 1991-02-15 1998-03-17 Discovision Associates Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal
US6069857A (en) 1991-02-15 2000-05-30 Discovision Associates Optical disc system having improved circuitry for performing blank sector check on readable disc
US5677899A (en) 1991-02-15 1997-10-14 Discovision Associates Method for moving carriage assembly from initial position to target position relative to storage medium
US6236625B1 (en) 1991-02-15 2001-05-22 Discovision Associates Optical disc system having current monitoring circuit with controller for laser driver and method for operating same
JPH04349236A (en) * 1991-05-27 1992-12-03 Pioneer Electron Corp Optical pick-up device
JP2555239B2 (en) * 1991-11-01 1996-11-20 株式会社日立製作所 Optical information recording / reproducing method
JPH071764U (en) * 1993-06-11 1995-01-13 ダイワ精工株式会社 Drag force adjuster for fishing reels
JPH07185243A (en) * 1993-12-24 1995-07-25 Nippon Spindle Mfg Co Ltd Dust collector
US5920539A (en) 1995-01-25 1999-07-06 Discovision Associates Apparatus and method for suppression of electromagnetic emissions having a groove on an external surface for passing an electrical conductor
US5748578A (en) 1995-01-25 1998-05-05 Discovision Associates Colpitts type oscillator having reduced ringing and improved optical disc system utilizing same
US6434087B1 (en) 1995-01-25 2002-08-13 Discovision Associates Optical disc system and method for controlling bias coil and light source to process information on a storage medium
US6091684A (en) 1995-01-25 2000-07-18 Discovision Associates Optical disc system and method for changing the rotational rate of an information storage medium
US6049518A (en) * 1995-08-31 2000-04-11 Sanyo Electric Co., Ltd. Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958258A (en) * 1953-09-21 1960-11-01 Technicolor Corp Optical projection of beam controlled object fields
NL243565A (en) * 1958-08-25 1900-01-01
US3328776A (en) * 1959-08-21 1967-06-27 Gen Electric Thermoplastic film tape recorder
US3234326A (en) * 1960-12-23 1966-02-08 Columbia Broadcasting Syst Inc Film recording reproducing apparatus
US3350503A (en) * 1962-03-21 1967-10-31 Minnesota Mining & Mfg Electron beam recording and reproducing system
US3361873A (en) * 1962-05-07 1968-01-02 Minnesota Mining & Mfg Disc recording system
US3365706A (en) * 1964-04-15 1968-01-23 Gilbert W. King Photo-optical data storage and retrieval system employing error detection and error location identification components
US3396266A (en) * 1964-05-25 1968-08-06 Ibm Optical information read-out system
US3368209A (en) * 1964-10-22 1968-02-06 Honeywell Inc Laser actuated curie point recording and readout system
US3444317A (en) * 1965-11-03 1969-05-13 Minnesota Mining & Mfg Electron beam recorder with frame rate conversion
US3474457A (en) * 1967-11-13 1969-10-21 Precision Instr Co Laser recording apparatus
DE1574687B2 (en) * 1968-02-06 1978-08-10 Robert Bosch Gmbh, 7000 Stuttgart Data carriers for information
US3530258A (en) * 1968-06-28 1970-09-22 Mca Technology Inc Video signal transducer having servo controlled flexible fiber optic track centering
US3657707A (en) * 1969-03-17 1972-04-18 Precision Instr Co Laser recording system with both surface defect and data error checking
US3579145A (en) * 1969-03-21 1971-05-18 Bell Telephone Labor Inc Modulator stabilization circuits
US3646568A (en) * 1969-04-03 1972-02-29 Rca Corp Beam control system
US3696344A (en) * 1970-02-19 1972-10-03 Energy Conversion Devices Inc Optical mass memory employing amorphous thin films
US3625617A (en) * 1970-07-15 1971-12-07 Honeywell Inc Kerr effect read-out system for an optical memory
DE2048430B2 (en) * 1970-10-02 1972-11-30 Licentia Patent-Verwaltungs-GmbH, 6000 Prankfurt METHOD FOR GENERATING PREFERABLY MECHANICALLY SCANABLE, RELIEF-LIKE RECESSES OR Bumps on the surface of an information carrier
DE2113717C3 (en) * 1971-03-22 1974-01-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Image-sound magnetic tape recorder
US3715740A (en) * 1971-08-30 1973-02-06 Honeywell Inc Optical mass memory
US3716845A (en) * 1972-03-09 1973-02-13 Honeywell Inc Optical memory with interferometer tracking
AR198680A1 (en) * 1972-09-02 1974-07-15 Philips Nv READING DEVICE OF A RECORDING CARRIER ON WHICH INFORMATION IS RECORDED ON AT LEAST ONE TRACK

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2951215A1 (en) * 1978-12-27 1980-07-03 Hitachi Ltd DEVICE FOR RECORDING INFORMATION
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
DE2949813A1 (en) * 1979-12-11 1981-06-19 Bts-Systementwicklungs Gmbh, 1000 Berlin DEVICE FOR RECORDING IMAGE AND SOUND INFORMATION PRESENT IN ELECTRICAL SIGNALS ON AN IMAGE DISK
EP0103994B1 (en) * 1982-08-23 1986-07-02 Hercules Incorporated Flavorings for sodium chloride substitutes
EP0102231B1 (en) * 1982-08-24 1988-11-02 Matsushita Electric Industrial Co., Ltd. Optical disk and method of recording and reproduction for the disk
EP0114082A2 (en) * 1983-01-14 1984-07-25 Koninklijke Philips Electronics N.V. Apparatus for recording and/or reading information by means of a radiation beam
EP0114082B1 (en) * 1983-01-14 1988-06-08 Koninklijke Philips Electronics N.V. Apparatus for recording and/or reading information by means of a radiation beam
EP0478989B1 (en) * 1990-10-01 1996-08-21 Blaupunkt-Werke GmbH Method of reading optical discs

Also Published As

Publication number Publication date
DE2462831C2 (en) 1983-03-24
JPS57147140A (en) 1982-09-10
FR2399088A1 (en) 1979-02-23
FR2218612A1 (en) 1974-09-13
JPS58161159A (en) 1983-09-24
NL8800809A (en) 1988-07-01
FR2218612B1 (en) 1980-03-07
FR2399087A1 (en) 1979-02-23
FR2399086A1 (en) 1979-02-23
FR2399089A1 (en) 1979-02-23
JPS5525889A (en) 1980-02-23
JPS6235170B2 (en) 1987-07-31
JPS571052B2 (en) 1982-01-09
JPS6224441A (en) 1987-02-02
JPS5732411B2 (en) 1982-07-10
JPS5732412B2 (en) 1982-07-10
FR2399090A1 (en) 1979-02-23
DE2462833C2 (en) 1983-02-10
NL8800808A (en) 1988-07-01
NL8800807A (en) 1988-07-01
JPS58161153A (en) 1983-09-24
JPS6224440A (en) 1987-02-02
JPS58161143A (en) 1983-09-24
DE2463376C2 (en) 1985-10-17
FR2399090B1 (en) 1982-12-03
JPS5736649B2 (en) 1982-08-05
JPS5525888A (en) 1980-02-23
FR2399089B1 (en) 1982-12-03
JPS5525892A (en) 1980-02-23
CA1013854A (en) 1977-07-12
JPS502415A (en) 1975-01-11
DE2403408B2 (en) 1978-06-29
JPS6338771B2 (en) 1988-08-02
DE2403408C3 (en) 1979-03-01
IT1008245B (en) 1976-11-10
FR2399086B1 (en) 1982-12-03
FR2399087B1 (en) 1982-12-03
FR2399088B1 (en) 1982-12-03
NL8800806A (en) 1988-07-01
DE2462835C2 (en) 1983-03-24
NL7402289A (en) 1974-08-22
DE2403408A1 (en) 1974-08-29
DE2462834C2 (en) 1988-08-18
JPS5525891A (en) 1980-02-23
JPS5525890A (en) 1980-02-23

Similar Documents

Publication Publication Date Title
GB1462791A (en) Method and apparatus for recording video information
JP2772514B2 (en) Device for recording electrical information signals
US4611318A (en) Method and apparatus for monitoring the storage of information on a storage medium
US4410969A (en) Optical information playback apparatus
US5412630A (en) Tracking system for optical disc memory using tracking error signals from main beam and auxiliary beams
US4502134A (en) Optical disc signal reproducing system with tilt immunization
US4583210A (en) Method and apparatus for storing and retrieving information
US4456914A (en) Method and apparatus for storing information on a storage medium
CA1189618A (en) Optical focussing-error detection array
GB1529954A (en) Optically readable records and reading apparatus therefor
EP0083193A1 (en) Apparatus for preformatting an optical disk
JPS5345506A (en) Information detecting apparatus
EP0005316A1 (en) Optical apparatus and process for recording information and record carrier formed by this apparatus; optical apparatus for retrieving the recorded information
JPH05210858A (en) Optical type data storage system having aberration compensation for reducing servo-crosstalk
US4123780A (en) Signal noise filtration for laser beam recording system
JPH0255849B2 (en)
JPH0412540B2 (en)
JPS6330701B2 (en)
JPS61220147A (en) Optical head
GB2033132A (en) Recording and playback
JPS61206925A (en) Optical recording and reproducing device
JPS6022738A (en) Optical disk
JPH03157820A (en) Optical reproducing device
EP0555037B1 (en) Magneto-optical information recording/reproducing apparatus
JP2672927B2 (en) Magneto-optical head

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