JPS56165936A - Optical information reproducer - Google Patents

Optical information reproducer

Info

Publication number
JPS56165936A
JPS56165936A JP6867380A JP6867380A JPS56165936A JP S56165936 A JPS56165936 A JP S56165936A JP 6867380 A JP6867380 A JP 6867380A JP 6867380 A JP6867380 A JP 6867380A JP S56165936 A JPS56165936 A JP S56165936A
Authority
JP
Japan
Prior art keywords
waveguides
information
photodetectors
floating head
tracks
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
JP6867380A
Other languages
Japanese (ja)
Inventor
Takao Hiuga
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP6867380A priority Critical patent/JPS56165936A/en
Publication of JPS56165936A publication Critical patent/JPS56165936A/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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To make construction simple and maintenance easy by projecting light spots to an optical information carrier by the use of waveguides, and allowing the waveguide for information detection to follow up information tracks according to the unbalance of the quantity of return light to the waveguides for deviation detection. CONSTITUTION:Beams of light from light sources 1a-1c respectively pass through condenser lenses 2, polarizers 3 and 1/4 wavelength plates 4, are conducted to a waveguide 5a for information detection and waveguides 5b, 5c for deviation detection, and are projected from a floating head 7 onto information tracks 6. The reflected beams thereof again pass through the waveguides 5a-5c, the 1/4 wavelength plates 4 and the polarizers 3 and enter photodetectors 8. Of the photodetectors 8, the outputs of the photodetectors 8b and 8c are inputted to a differential amplifier 9, the output whereof is inputted to an electrostrictive vibrator 10, then the floating head pressing member 12 mounted to the leading end of a connecting rod 12a is driven, by which a floating head 7 is vibrated in the direction intersecting orthogonally with the tracks 6 and the recording information is detected from the photodetector 8a.
JP6867380A 1980-05-22 1980-05-22 Optical information reproducer Pending JPS56165936A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6867380A JPS56165936A (en) 1980-05-22 1980-05-22 Optical information reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6867380A JPS56165936A (en) 1980-05-22 1980-05-22 Optical information reproducer

Publications (1)

Publication Number Publication Date
JPS56165936A true JPS56165936A (en) 1981-12-19

Family

ID=13380460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6867380A Pending JPS56165936A (en) 1980-05-22 1980-05-22 Optical information reproducer

Country Status (1)

Country Link
JP (1) JPS56165936A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5954046A (en) * 1982-09-22 1984-03-28 Canon Inc Method and device for detecting focus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5470004A (en) * 1977-11-15 1979-06-05 Toshiba Corp Optical information reader

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5470004A (en) * 1977-11-15 1979-06-05 Toshiba Corp Optical information reader

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5954046A (en) * 1982-09-22 1984-03-28 Canon Inc Method and device for detecting focus
JPH0439131B2 (en) * 1982-09-22 1992-06-26

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