JPS57172536A - Information recording and reproducing device - Google Patents

Information recording and reproducing device

Info

Publication number
JPS57172536A
JPS57172536A JP56056647A JP5664781A JPS57172536A JP S57172536 A JPS57172536 A JP S57172536A JP 56056647 A JP56056647 A JP 56056647A JP 5664781 A JP5664781 A JP 5664781A JP S57172536 A JPS57172536 A JP S57172536A
Authority
JP
Japan
Prior art keywords
track
light spot
light
semiconductor laser
recording
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
JP56056647A
Other languages
Japanese (ja)
Inventor
Shigeru Arai
Koichi Ogawa
Akira Minami
Itaru Shibata
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56056647A priority Critical patent/JPS57172536A/en
Publication of JPS57172536A publication Critical patent/JPS57172536A/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
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • 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

Landscapes

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

Abstract

PURPOSE:To stabilize the additional writing of a device records and reproduces information by using a couple of light sources, by providing a recording and a reproduction part corresponding to said couple of light sources, and swiching the recording part and reproduction part selectively. CONSTITUTION:Adjacent tracks on a disk D are irradiated with light beams from a semiconductor laser S through lenses L1 and L2. The semiconductor laser S generates two light beams. When a playback signal is detected while driving circuits D1 and D2 are both set in playback mode M, one light spot starts illuminating a final track and a playback signal detected by the other light spot is absent, so it is evident that this track is the final track. Then, the driving circuit D2 is placed in recording mode R and the semiconductor laser is controlled according to information to be recorded to irradiate the track with the light spot, thus controlling the focusing of the light spot and a shift in irradiation position.
JP56056647A 1981-04-15 1981-04-15 Information recording and reproducing device Pending JPS57172536A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56056647A JPS57172536A (en) 1981-04-15 1981-04-15 Information recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56056647A JPS57172536A (en) 1981-04-15 1981-04-15 Information recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS57172536A true JPS57172536A (en) 1982-10-23

Family

ID=13033135

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56056647A Pending JPS57172536A (en) 1981-04-15 1981-04-15 Information recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS57172536A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2552576A1 (en) * 1983-09-26 1985-03-29 Philips Nv METHOD FOR RECORDING INFORMATION IN A MAGNETO-OPTICAL INFORMATION MEDIUM, DEVICE FOR IMPLEMENTING THE METHOD, AND MAGNETO-OPTICAL INFORMATION MEDIUM FOR USE IN A DEVICE FOR IMPLEMENTING THE METHOD

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2552576A1 (en) * 1983-09-26 1985-03-29 Philips Nv METHOD FOR RECORDING INFORMATION IN A MAGNETO-OPTICAL INFORMATION MEDIUM, DEVICE FOR IMPLEMENTING THE METHOD, AND MAGNETO-OPTICAL INFORMATION MEDIUM FOR USE IN A DEVICE FOR IMPLEMENTING THE METHOD

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