JPS6256581B2 - - Google Patents

Info

Publication number
JPS6256581B2
JPS6256581B2 JP55125613A JP12561380A JPS6256581B2 JP S6256581 B2 JPS6256581 B2 JP S6256581B2 JP 55125613 A JP55125613 A JP 55125613A JP 12561380 A JP12561380 A JP 12561380A JP S6256581 B2 JPS6256581 B2 JP S6256581B2
Authority
JP
Japan
Prior art keywords
light beam
condenser lens
axis direction
light
recording medium
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
JP55125613A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5750335A (en
Inventor
Mitsushige Kondo
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP55125613A priority Critical patent/JPS5750335A/ja
Publication of JPS5750335A publication Critical patent/JPS5750335A/ja
Publication of JPS6256581B2 publication Critical patent/JPS6256581B2/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
    • G11B7/135—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
    • G11B7/1398—Means for shaping the cross-section of the beam, e.g. into circular or elliptical cross-section

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
JP55125613A 1980-09-09 1980-09-09 Optical information reproducer Granted JPS5750335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55125613A JPS5750335A (en) 1980-09-09 1980-09-09 Optical information reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55125613A JPS5750335A (en) 1980-09-09 1980-09-09 Optical information reproducer

Publications (2)

Publication Number Publication Date
JPS5750335A JPS5750335A (en) 1982-03-24
JPS6256581B2 true JPS6256581B2 (enrdf_load_stackoverflow) 1987-11-26

Family

ID=14914417

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55125613A Granted JPS5750335A (en) 1980-09-09 1980-09-09 Optical information reproducer

Country Status (1)

Country Link
JP (1) JPS5750335A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04365781A (ja) * 1991-06-14 1992-12-17 Toshiba Corp エレベータのかご室

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6157320U (enrdf_load_stackoverflow) * 1984-09-20 1986-04-17
JPH07105060B2 (ja) * 1987-09-18 1995-11-13 三洋電機株式会社 光ピックアップ装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5111021A (ja) * 1974-07-17 1976-01-28 Daido Steel Co Ltd Modoshuhoho
JPS5265406A (en) * 1975-11-27 1977-05-30 Hitachi Ltd Inforamtion reproduction device
JPS5318A (en) * 1976-06-24 1978-01-05 Mitsubishi Electric Corp Optical video disc reproduction unit
JPS5391759A (en) * 1976-12-27 1978-08-11 Mansei Kogyo Kk Optics to obtain equal direction spot from various direction light beam
JPS5445156A (en) * 1977-09-16 1979-04-10 Hitachi Ltd Optical system
JPS5589924A (en) * 1978-12-27 1980-07-08 Toshiba Corp Optical information reproduction unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04365781A (ja) * 1991-06-14 1992-12-17 Toshiba Corp エレベータのかご室

Also Published As

Publication number Publication date
JPS5750335A (en) 1982-03-24

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