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JPS573230A - Recorder and reproducer for optical information - Google Patents

Recorder and reproducer for optical information

Info

Publication number
JPS573230A
JPS573230A JP7544380A JP7544380A JPS573230A JP S573230 A JPS573230 A JP S573230A JP 7544380 A JP7544380 A JP 7544380A JP 7544380 A JP7544380 A JP 7544380A JP S573230 A JPS573230 A JP S573230A
Authority
JP
Japan
Prior art keywords
recording
wavelength
light
disk
lambda2
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
JP7544380A
Other languages
Japanese (ja)
Inventor
Hiroo Ukita
Susumu Yonezawa
Akinori Watabe
Kikuji Kato
Shuzo Fukunishi
Manabu Yamamoto
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP7544380A priority Critical patent/JPS573230A/en
Publication of JPS573230A publication Critical patent/JPS573230A/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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • 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
    • G11B7/0908—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 for focusing only

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To achieve recording of high quality stably at a high speed by using two light sources differing in wavelength for recording and focus control, and by using a recording medium having high absorptivity for the wavelength of the recording light source. CONSTITUTION:Recording light of wavelength lambda2 from a laser diode 102 is written on a disk 1 by way of a beam splitters 82 and 81, and an objective lens 6. Focus control light of wavelength lambda2 from a laser diode 102, on the other hand, is passed through beam splitters 83 and 81 and the objective lens 6 and focused on the disk 1 via a lens actuator 7. Its reflected light is photodetected by a couple of photodetectors 203, whose outputs are inputted to a differential amplifier 11, thereby driving the lens actuator 7 on the basis of the differential output. For the disk, a recording material which absorbs light of wavelength lambda2 well and reflects the other light of wavelength lambda1 is used. Thus, recording of high quality is achieved stably in a short time.
JP7544380A 1980-06-06 1980-06-06 Recorder and reproducer for optical information Pending JPS573230A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7544380A JPS573230A (en) 1980-06-06 1980-06-06 Recorder and reproducer for optical information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7544380A JPS573230A (en) 1980-06-06 1980-06-06 Recorder and reproducer for optical information

Publications (1)

Publication Number Publication Date
JPS573230A true JPS573230A (en) 1982-01-08

Family

ID=13576387

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7544380A Pending JPS573230A (en) 1980-06-06 1980-06-06 Recorder and reproducer for optical information

Country Status (1)

Country Link
JP (1) JPS573230A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5155721A (en) * 1986-09-13 1992-10-13 Omron Tateisi Electronics Co. Optical data storage accessing apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50158699A (en) * 1974-05-13 1975-12-22
JPS54107708A (en) * 1978-02-13 1979-08-23 Toshiba Corp Optical information recorder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50158699A (en) * 1974-05-13 1975-12-22
JPS54107708A (en) * 1978-02-13 1979-08-23 Toshiba Corp Optical information recorder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5155721A (en) * 1986-09-13 1992-10-13 Omron Tateisi Electronics Co. Optical data storage accessing apparatus

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