SE8304295L - LASER SYSTEM FOR READING DATA - Google Patents

LASER SYSTEM FOR READING DATA

Info

Publication number
SE8304295L
SE8304295L SE8304295A SE8304295A SE8304295L SE 8304295 L SE8304295 L SE 8304295L SE 8304295 A SE8304295 A SE 8304295A SE 8304295 A SE8304295 A SE 8304295A SE 8304295 L SE8304295 L SE 8304295L
Authority
SE
Sweden
Prior art keywords
data
prerecorded
particulate matter
disk
light
Prior art date
Application number
SE8304295A
Other languages
Swedish (sv)
Other versions
SE8304295D0 (en
Inventor
J Drexler
Original Assignee
Drexler Tech
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 Drexler Tech filed Critical Drexler Tech
Publication of SE8304295D0 publication Critical patent/SE8304295D0/en
Publication of SE8304295L publication Critical patent/SE8304295L/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
    • 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
    • G11B7/08—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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • 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
    • 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0033—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with cards or other card-like flat carriers, e.g. flat sheets of optical film

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Lasers (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

In a system for recovering data, both prerecorded (e.g. servo track) and user data, from a reflective optical data storage medium, with the further capability of distinguishing data from foreign particulate matter on a data disk 65, a pair of detectors 71, 77 measures the fraction of light 73 (e.g. infrared laser light) reflected from and the fraction of light 75 transmitted through the data disk 65 and, knowing the fraction of light absorbed by the disk 65 distinguishes user data from prerecorded data and particulate matter. Third detector T2 samples laser 61 output the data disk 65 has different optical characteristics for prerecorded and user data, the prerecorded information being black, highly absorptive silver, while the user data consists of pits or relatively high transmissivity in a reflective field. Particulate matter is recognized by intermediate reflectivity and transmissivity. The optical characteristics of the material are enhanced or exaggerated so that the two types of data and particulate matter can be distinguished. Record carrier constructions are detailed (Figures 2, 3, 4), as are materials (silver halide emulsion type) and processing thereof. A pattern may be located in layer (29) for security purposes. A quarter wave plate is used in the (Figure 7) system. <IMAGE>
SE8304295A 1982-08-09 1983-08-05 LASER SYSTEM FOR READING DATA SE8304295L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US40671982A 1982-08-09 1982-08-09

Publications (2)

Publication Number Publication Date
SE8304295D0 SE8304295D0 (en) 1983-08-05
SE8304295L true SE8304295L (en) 1984-02-10

Family

ID=23609170

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8304295A SE8304295L (en) 1982-08-09 1983-08-05 LASER SYSTEM FOR READING DATA

Country Status (5)

Country Link
JP (1) JPS5952436A (en)
CA (1) CA1200609A (en)
DE (1) DE3328368A1 (en)
GB (1) GB2126406B (en)
SE (1) SE8304295L (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4570252A (en) * 1982-08-09 1986-02-11 Drexler Technology Corporation Optical data retrieval system using multi-spectral light sources
WO1986002767A1 (en) * 1984-10-29 1986-05-09 Ncr Corporation Optical data reader
JP2552109B2 (en) * 1985-11-08 1996-11-06 セイコーエプソン株式会社 Optical recording / reproducing device
EP0242118B1 (en) * 1986-04-09 1992-01-22 Canon Kabushiki Kaisha An optical information medium and apparatus for reading information from, and/or writing information on, such a medium

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145758A (en) * 1977-10-25 1979-03-20 Drexler Technology Corporation Error checking method and apparatus for digital data in optical recording systems

Also Published As

Publication number Publication date
GB2126406B (en) 1986-12-17
JPS5952436A (en) 1984-03-27
SE8304295D0 (en) 1983-08-05
DE3328368A1 (en) 1984-02-09
GB8320087D0 (en) 1983-08-24
GB2126406A (en) 1984-03-21
CA1200609A (en) 1986-02-11

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Legal Events

Date Code Title Description
NAV Patent application has lapsed

Ref document number: 8304295-2

Effective date: 19880603