JPS57176547A - Optical recorder - Google Patents

Optical recorder

Info

Publication number
JPS57176547A
JPS57176547A JP56059409A JP5940981A JPS57176547A JP S57176547 A JPS57176547 A JP S57176547A JP 56059409 A JP56059409 A JP 56059409A JP 5940981 A JP5940981 A JP 5940981A JP S57176547 A JPS57176547 A JP S57176547A
Authority
JP
Japan
Prior art keywords
light
optical
vsl
modulated
information signal
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.)
Granted
Application number
JP56059409A
Other languages
English (en)
Other versions
JPS6161451B2 (ja
Inventor
Ichiro Ueno
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.)
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Victor Company of Japan Ltd
Nippon Victor KK
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 Victor Company of Japan Ltd, Nippon Victor KK filed Critical Victor Company of Japan Ltd
Priority to JP56059409A priority Critical patent/JPS57176547A/ja
Publication of JPS57176547A publication Critical patent/JPS57176547A/ja
Publication of JPS6161451B2 publication Critical patent/JPS6161451B2/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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • 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)
JP56059409A 1981-04-20 1981-04-20 Optical recorder Granted JPS57176547A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56059409A JPS57176547A (en) 1981-04-20 1981-04-20 Optical recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56059409A JPS57176547A (en) 1981-04-20 1981-04-20 Optical recorder

Publications (2)

Publication Number Publication Date
JPS57176547A true JPS57176547A (en) 1982-10-29
JPS6161451B2 JPS6161451B2 (ja) 1986-12-25

Family

ID=13112445

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56059409A Granted JPS57176547A (en) 1981-04-20 1981-04-20 Optical recorder

Country Status (1)

Country Link
JP (1) JPS57176547A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59227044A (ja) * 1983-06-07 1984-12-20 Matsushita Electric Ind Co Ltd 記録ビ−ム監視装置
EP0195227A2 (en) * 1985-03-20 1986-09-24 Hitachi, Ltd. Magneto-optical disc memory

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59227044A (ja) * 1983-06-07 1984-12-20 Matsushita Electric Ind Co Ltd 記録ビ−ム監視装置
EP0195227A2 (en) * 1985-03-20 1986-09-24 Hitachi, Ltd. Magneto-optical disc memory
EP0195227A3 (en) * 1985-03-20 1989-07-19 Hitachi, Ltd. Magneto-optical disc memory

Also Published As

Publication number Publication date
JPS6161451B2 (ja) 1986-12-25

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