JPS5269306A - Information reproduction device - Google Patents

Information reproduction device

Info

Publication number
JPS5269306A
JPS5269306A JP50143994A JP14399475A JPS5269306A JP S5269306 A JPS5269306 A JP S5269306A JP 50143994 A JP50143994 A JP 50143994A JP 14399475 A JP14399475 A JP 14399475A JP S5269306 A JPS5269306 A JP S5269306A
Authority
JP
Japan
Prior art keywords
reproduction device
information reproduction
width
disc
changing
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.)
Pending
Application number
JP50143994A
Other languages
Japanese (ja)
Inventor
Yoshisada Oshida
Susumu Sawano
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP50143994A priority Critical patent/JPS5269306A/en
Priority to NL7612070A priority patent/NL7612070A/en
Priority to DE19762649549 priority patent/DE2649549A1/en
Priority to FR7632725A priority patent/FR2330108A1/en
Priority to GB45173/76A priority patent/GB1545234A/en
Priority to US05/737,329 priority patent/US4125859A/en
Publication of JPS5269306A publication Critical patent/JPS5269306A/en
Pending 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE:To perform good reproduction free from waveform distortion over the entire disc region by changing the width of a disc radiation laser beam so that the width becomes larger on the inside circumference, in a reproduction device, etc. using photo video discs.
JP50143994A 1975-10-31 1975-12-05 Information reproduction device Pending JPS5269306A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP50143994A JPS5269306A (en) 1975-12-05 1975-12-05 Information reproduction device
NL7612070A NL7612070A (en) 1975-10-31 1976-10-29 DEVICE FOR READING INFORMATION.
DE19762649549 DE2649549A1 (en) 1975-10-31 1976-10-29 INFORMATION REPLAY DEVICE
FR7632725A FR2330108A1 (en) 1975-10-31 1976-10-29 INFORMATION RESTITUTION DEVICE
GB45173/76A GB1545234A (en) 1975-10-31 1976-10-29 Information play-back apparatus
US05/737,329 US4125859A (en) 1975-10-31 1976-11-01 Videodisc play-back apparatus with variable width beam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50143994A JPS5269306A (en) 1975-12-05 1975-12-05 Information reproduction device

Publications (1)

Publication Number Publication Date
JPS5269306A true JPS5269306A (en) 1977-06-09

Family

ID=15351826

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50143994A Pending JPS5269306A (en) 1975-10-31 1975-12-05 Information reproduction device

Country Status (1)

Country Link
JP (1) JPS5269306A (en)

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