NL7312738A - Information recording system using an optical structure - has intensity varied laser light beam source and information recorded by time interval durations - Google Patents

Information recording system using an optical structure - has intensity varied laser light beam source and information recorded by time interval durations

Info

Publication number
NL7312738A
NL7312738A NL7312738A NL7312738A NL7312738A NL 7312738 A NL7312738 A NL 7312738A NL 7312738 A NL7312738 A NL 7312738A NL 7312738 A NL7312738 A NL 7312738A NL 7312738 A NL7312738 A NL 7312738A
Authority
NL
Netherlands
Prior art keywords
light beam
laser light
time interval
recording system
beam source
Prior art date
Application number
NL7312738A
Other languages
Dutch (nl)
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Priority to NL7312738A priority Critical patent/NL7312738A/en
Publication of NL7312738A publication Critical patent/NL7312738A/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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

The recorded information is retained in the form of variable time intervals between optical records at two levels of intensity. The input information is generated by a laser source of 300kHz with an intensity variation of about 15% fed to the record track through a half-silvered mirror and lens. The return reflection from the track may be reflected to an electronic detector circuit. The record is in the form of a rotating sensitive member with the laser light beam impinging at a more-or-less constant angle. Several track records may be made in a concentric or semi-concentric manner.
NL7312738A 1973-09-14 1973-09-14 Information recording system using an optical structure - has intensity varied laser light beam source and information recorded by time interval durations NL7312738A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7312738A NL7312738A (en) 1973-09-14 1973-09-14 Information recording system using an optical structure - has intensity varied laser light beam source and information recorded by time interval durations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7312738A NL7312738A (en) 1973-09-14 1973-09-14 Information recording system using an optical structure - has intensity varied laser light beam source and information recorded by time interval durations

Publications (1)

Publication Number Publication Date
NL7312738A true NL7312738A (en) 1975-03-18

Family

ID=19819610

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7312738A NL7312738A (en) 1973-09-14 1973-09-14 Information recording system using an optical structure - has intensity varied laser light beam source and information recorded by time interval durations

Country Status (1)

Country Link
NL (1) NL7312738A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2371743A1 (en) * 1976-11-18 1978-06-16 Sony Corp METHOD AND APPARATUS FOR PRODUCING A ROTARY RECORDING MEDIA

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2371743A1 (en) * 1976-11-18 1978-06-16 Sony Corp METHOD AND APPARATUS FOR PRODUCING A ROTARY RECORDING MEDIA

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