SE7810132L - DEVICE FOR WRITTEN AND READING OF A VIDEO DISC ELEMENT AS A VIDEO DISC ELEMENT - Google Patents

DEVICE FOR WRITTEN AND READING OF A VIDEO DISC ELEMENT AS A VIDEO DISC ELEMENT

Info

Publication number
SE7810132L
SE7810132L SE7810132A SE7810132A SE7810132L SE 7810132 L SE7810132 L SE 7810132L SE 7810132 A SE7810132 A SE 7810132A SE 7810132 A SE7810132 A SE 7810132A SE 7810132 L SE7810132 L SE 7810132L
Authority
SE
Sweden
Prior art keywords
intensity
light
disk element
video disk
type
Prior art date
Application number
SE7810132A
Other languages
Swedish (sv)
Other versions
SE418916B (en
Inventor
J S Winslow
Original Assignee
Mca Disco Vision
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 Disco Vision filed Critical Mca Disco Vision
Priority to SE7810132A priority Critical patent/SE418916B/en
Publication of SE7810132L publication Critical patent/SE7810132L/en
Publication of SE418916B publication Critical patent/SE418916B/en

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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00453—Recording involving spectral or photochemical hole burning
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/36—Monitoring, i.e. supervising the progress of recording or 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
    • G11B7/12—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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

The invention concerns the method and apparatus for recording video information in the form of a frequency- modulated signal on a video disk element 10 and for recovery of the video information from the video disk element. The recording apparatus has a laser as a source 30 of a laser writing beam 29, 29' and an optical writing unit 40, 41 for directing the stationary laser writing beam against a moveable video disk element 10. The video disk element comprises a substrate 22, which carries a coating 26 that can be influenced by light on at least one surface 24. The optical writing unit 40, 41 focuses the beam into a tiny spot of light 42 with a diameter of around 1 micrometer on the coating layer 26 which can be influenced by light. The intensity of the focused spot can be altered under control by a light intensity modulating unit 44. This light intensity modulator 44 changes the intensity of the laser writing beam 29, 29' with respect to a predetermined threshold intensity, which is high enough to form a first type of markings 37 in the coated layer. The length of the first type of marking depends on the speed of movement of the video disk element 10 and the time during which the intensity of the writing laser exceeds the predetermined or material-dependent threshold intensity. When the intensity of the laser writing beam drops below the predetermined threshold intensity, the formation of the first type of marking 37 ceases. The intervening portions of the light-influenced coating layer that are situated between consecutive markings of the first type serve as a second type of marking 38. A motion control unit 28 rotates and translates the video disk element relative to the intensity-modulated writing light beam. In this way, a linear sequence of first and second markings is formed on the substrate. The first and the second markings 37, 38 have variable length and represent the frequency- modulated signal used for the recording. <IMAGE>
SE7810132A 1978-09-27 1978-09-27 Method for processing of information plus apparatus for information processing SE418916B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE7810132A SE418916B (en) 1978-09-27 1978-09-27 Method for processing of information plus apparatus for information processing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7810132A SE418916B (en) 1978-09-27 1978-09-27 Method for processing of information plus apparatus for information processing

Publications (2)

Publication Number Publication Date
SE7810132L true SE7810132L (en) 1980-03-28
SE418916B SE418916B (en) 1981-06-29

Family

ID=20335939

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7810132A SE418916B (en) 1978-09-27 1978-09-27 Method for processing of information plus apparatus for information processing

Country Status (1)

Country Link
SE (1) SE418916B (en)

Also Published As

Publication number Publication date
SE418916B (en) 1981-06-29

Similar Documents

Publication Publication Date Title
MX149614A (en) IMPROVEMENTS TO A MASTER DISC FOR INFORMATION RECORDING THROUGH LIGHT RADIATION
EP0077643B1 (en) Optical memory system providing improved focusing control
KR910003612A (en) Optical recorder
JPS57130240A (en) Optical information recording and reproducing device and information recording medium for it
ATE220238T1 (en) OPTICAL INFORMATION RECORDING MEDIUM
CA1100233A (en) Scanning light beam of changing size
EP0527539A2 (en) An optical memory medium
ATE105962T1 (en) OPTICAL RECORDING DEVICE AND OPTICAL DISK.
ATE172048T1 (en) MAGNETOPTICAL INFORMATION RECORDING AND PLAYBACKING DEVICE
CA1119296A (en) Information signal recording medium of the rotary type
ATE120024T1 (en) METHOD FOR REPRODUCING INFORMATION FROM A SELECTED TRACK OF A RECORDING DISC.
GB1509495A (en) Record disc and method of producing the same
SE7810132L (en) DEVICE FOR WRITTEN AND READING OF A VIDEO DISC ELEMENT AS A VIDEO DISC ELEMENT
SE7810128L (en) DEVICE FOR WRITING AND READING A VIDEO DISC ELEMENT AS A VIDEO DISC ELEMENT
KR880013126A (en) Optical disc master plate manufacturing method and manufacturing apparatus and optical disc
SE7810130L (en) DEVICE FOR WRITING AND READING A VIDEO DISC ELEMENT AS A VIDEO DISC ELEMENT
ATE39589T1 (en) METHOD AND APPARATUS FOR RECOVERING INFORMATION FROM A SELECTED TRACK ON A RECORDING DISK.
KR970002919A (en) Improved optical disc tracking control
JPS57103134A (en) Optical disk
JPS5919240A (en) Optical information recording system
JPS5562534A (en) Information signal recording method for original disc of grooveless information recording medium disc
JPS5769532A (en) Optical information recording and reproducing method
JPS5237404A (en) Optical recorder/player
IE36945B1 (en) Method for storing and reproducing data carrier for carrying out this method and method for manufacturing the carrier
JPS567244A (en) Optical recording and reproducing system

Legal Events

Date Code Title Description
NUG Patent has lapsed

Ref document number: 7810132-6

Effective date: 19891003

Format of ref document f/p: F