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JPS5750335A - Optical information reproducer - Google Patents

Optical information reproducer

Info

Publication number
JPS5750335A
JPS5750335A JP55125613A JP12561380A JPS5750335A JP S5750335 A JPS5750335 A JP S5750335A JP 55125613 A JP55125613 A JP 55125613A JP 12561380 A JP12561380 A JP 12561380A JP S5750335 A JPS5750335 A JP S5750335A
Authority
JP
Japan
Prior art keywords
longer diameter
flux
property
condenser lens
flat light
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
JP55125613A
Other languages
Japanese (ja)
Other versions
JPS6256581B2 (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/en
Publication of JPS5750335A publication Critical patent/JPS5750335A/en
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)

Abstract

PURPOSE:To increase not only the crosstalk property but the space frequency property, by increasing the size of a flat light flux incident to a condenser lens in the direction of its longer diameter more that the effective aperture of the condenser lens. CONSTITUTION:A flat light flax 2a irradiated from a collimator lens 3 is turned into a flat light flux 2b via a polarized beam splitter 4, a 1/4 wavelength plate 5, etc. to be made incident to a condenser lens 9. Then an optical system is set up so that the size of the flux 2b in its longer diameter direction is larger than the effective aperture of the lens 9 and at the same time the longer diameter direction of the flux 2b is parallel to an information track 13. As a result, the longer diameter direction of a light spot 10 becomes orthogonal to the track 13. In such constitution, the spot 10 can be sufficiently stopped down to increase both the crosstalk property and the space frequency property.
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 true JPS5750335A (en) 1982-03-24
JPS6256581B2 JPS6256581B2 (en) 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 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6157320U (en) * 1984-09-20 1986-04-17
JPS6478441A (en) * 1987-09-18 1989-03-23 Sanyo Electric Co Optical pickup device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04365781A (en) * 1991-06-14 1992-12-17 Toshiba Corp Cage room for elevator

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5111021A (en) * 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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5111021A (en) * 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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6157320U (en) * 1984-09-20 1986-04-17
JPS6478441A (en) * 1987-09-18 1989-03-23 Sanyo Electric Co Optical pickup device

Also Published As

Publication number Publication date
JPS6256581B2 (en) 1987-11-26

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