JPS618496B2 - - Google Patents

Info

Publication number
JPS618496B2
JPS618496B2 JP50142054A JP14205475A JPS618496B2 JP S618496 B2 JPS618496 B2 JP S618496B2 JP 50142054 A JP50142054 A JP 50142054A JP 14205475 A JP14205475 A JP 14205475A JP S618496 B2 JPS618496 B2 JP S618496B2
Authority
JP
Japan
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
JP50142054A
Other languages
Japanese (ja)
Other versions
JPS5265406A (en
Inventor
Giichi Tsunoda
Takeshi Maeda
Toshimitsu Myauchi
Kimio Tateno
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 JP50142054A priority Critical patent/JPS5265406A/ja
Publication of JPS5265406A publication Critical patent/JPS5265406A/ja
Publication of JPS618496B2 publication Critical patent/JPS618496B2/ja
Granted 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
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B2007/13727—Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
JP50142054A 1975-11-27 1975-11-27 Inforamtion reproduction device Granted JPS5265406A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50142054A JPS5265406A (en) 1975-11-27 1975-11-27 Inforamtion reproduction device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50142054A JPS5265406A (en) 1975-11-27 1975-11-27 Inforamtion reproduction device

Related Child Applications (2)

Application Number Title Priority Date Filing Date
JP61281750A Division JPS62157338A (ja) 1986-11-28 1986-11-28 半導体レ−ザ光学装置
JP61281751A Division JPS62157339A (ja) 1986-11-28 1986-11-28 情報再生装置

Publications (2)

Publication Number Publication Date
JPS5265406A JPS5265406A (en) 1977-05-30
JPS618496B2 true JPS618496B2 (enrdf_load_stackoverflow) 1986-03-14

Family

ID=15306328

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50142054A Granted JPS5265406A (en) 1975-11-27 1975-11-27 Inforamtion reproduction device

Country Status (1)

Country Link
JP (1) JPS5265406A (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5641A (en) * 1979-06-15 1981-01-06 Hitachi Ltd Processor for optical information
JPS5750335A (en) * 1980-09-09 1982-03-24 Mitsubishi Electric Corp Optical information reproducer
US4609813A (en) * 1985-03-18 1986-09-02 International Business Machines Corporation Optical systems employing ovate light beams
JPS62157339A (ja) * 1986-11-28 1987-07-13 Hitachi Ltd 情報再生装置

Also Published As

Publication number Publication date
JPS5265406A (en) 1977-05-30

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