GB1186207A - Improvements in or relating to Data Recording Systems - Google Patents

Improvements in or relating to Data Recording Systems

Info

Publication number
GB1186207A
GB1186207A GB4776067A GB4776067A GB1186207A GB 1186207 A GB1186207 A GB 1186207A GB 4776067 A GB4776067 A GB 4776067A GB 4776067 A GB4776067 A GB 4776067A GB 1186207 A GB1186207 A GB 1186207A
Authority
GB
United Kingdom
Prior art keywords
diode
inch
light
maximum
film
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
GB4776067A
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.)
Norton Research Corp
Original Assignee
Norton Research Corp
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 Norton Research Corp filed Critical Norton Research Corp
Publication of GB1186207A publication Critical patent/GB1186207A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • 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
    • G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent
    • G11B7/0032—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent for moving-picture soundtracks, i.e. cinema
    • 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
    • G11B7/127—Lasers; Multiple laser arrays

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Led Devices (AREA)

Abstract

1,186,207. Optical recording. NORTON RESEARCH CORP. 20 Oct., 1967 [1 Nov., 1966; 22 Dec., 1966], No. 47760/67. Heading G5R. Sound or other data (e.g. television signals) is recorded on photographic film 10 by an electroluminescent junction diode 14 formed by a base crystal and a layer of opposite-type impurities, the diode emitting light 28 over an area at least 0.001 inch wide, measured in the direction of relative movement, and being spaced less than 0À004 inch from the film, the light striking the film having a peaked transmission (exposure) curve of width less than 0.003 inch at 80% maximum intensity and more than 0.002 inch at 50% maximum intensity. The diode is preferably of SiC with a P-type layer on an N-type base and the light-emitting edge polished. The diode current from unit 26 is such that maximum light corresponding to maximum signal intensity is still on the linear part of the exposure v. diode current curve. The gain of the amplifier stage may be linear but preferably increases with frequency to extend the upper frequency limit, e.g. to 7 kHz.
GB4776067A 1966-11-01 1967-10-20 Improvements in or relating to Data Recording Systems Expired GB1186207A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59133266A 1966-11-01 1966-11-01
US60385366A 1966-12-22 1966-12-22

Publications (1)

Publication Number Publication Date
GB1186207A true GB1186207A (en) 1970-04-02

Family

ID=27081121

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4776067A Expired GB1186207A (en) 1966-11-01 1967-10-20 Improvements in or relating to Data Recording Systems

Country Status (4)

Country Link
CH (1) CH471431A (en)
DE (1) DE1524968A1 (en)
GB (1) GB1186207A (en)
NL (1) NL6714798A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0444850A3 (en) * 1990-02-26 1992-08-26 Kabushiki Kaisha Toshiba Optical floppy disk system

Also Published As

Publication number Publication date
CH471431A (en) 1969-04-15
NL6714798A (en) 1968-05-02
DE1524968A1 (en) 1970-12-23

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees