JPS57191848A - Optical disk recording and reproducing device - Google Patents

Optical disk recording and reproducing device

Info

Publication number
JPS57191848A
JPS57191848A JP7720781A JP7720781A JPS57191848A JP S57191848 A JPS57191848 A JP S57191848A JP 7720781 A JP7720781 A JP 7720781A JP 7720781 A JP7720781 A JP 7720781A JP S57191848 A JPS57191848 A JP S57191848A
Authority
JP
Japan
Prior art keywords
tracking
information
converted
beams
disk
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
JP7720781A
Other languages
Japanese (ja)
Other versions
JPH0459693B2 (en
Inventor
Hideji Kawabata
Masahiro Orukawa
Akira Muto
Yoshihiko Kudo
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP7720781A priority Critical patent/JPS57191848A/en
Publication of JPS57191848A publication Critical patent/JPS57191848A/en
Publication of JPH0459693B2 publication Critical patent/JPH0459693B2/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
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

PURPOSE:To track an optical disk securely and easily during recording, reproduction and erasure by recording tracking information on the magnetic film of a disk substrate, and then detecting the information optically. CONSTITUTION:In the magnetic thin film 7 provided over a discoid substrate 5, tracking information 8 is recorded by a heating means, and the disk further has a transparent protective layer 9. Light from a linear polarized beam source 10 including a laser is divided by a diffraction grating into beams for tracking, which are passed through a beam splitter 12 and then converged to a very small diameter by the optical pickup 13 including an objective lens before being caused to illuminate main information and the tracking information in the magnetic film. The tracking beams when reflected has the plane of polarization roated and are converted by an analyzer 14 into light and shade variation with excellent contrast, which is inputted to a photodetector 15, where it is converted into a signal 16 and fed back to an optical pickup 13.
JP7720781A 1981-05-20 1981-05-20 Optical disk recording and reproducing device Granted JPS57191848A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7720781A JPS57191848A (en) 1981-05-20 1981-05-20 Optical disk recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7720781A JPS57191848A (en) 1981-05-20 1981-05-20 Optical disk recording and reproducing device

Publications (2)

Publication Number Publication Date
JPS57191848A true JPS57191848A (en) 1982-11-25
JPH0459693B2 JPH0459693B2 (en) 1992-09-24

Family

ID=13627375

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7720781A Granted JPS57191848A (en) 1981-05-20 1981-05-20 Optical disk recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS57191848A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029955A (en) * 1983-07-29 1985-02-15 Toshiba Corp Optical information recording medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5661031A (en) * 1979-10-22 1981-05-26 Kokusai Denshin Denwa Co Ltd <Kdd> Optical magnetic recording medium
JPS5730132A (en) * 1980-07-29 1982-02-18 Sharp Corp Magnetooptical storage device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5661031A (en) * 1979-10-22 1981-05-26 Kokusai Denshin Denwa Co Ltd <Kdd> Optical magnetic recording medium
JPS5730132A (en) * 1980-07-29 1982-02-18 Sharp Corp Magnetooptical storage device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029955A (en) * 1983-07-29 1985-02-15 Toshiba Corp Optical information recording medium

Also Published As

Publication number Publication date
JPH0459693B2 (en) 1992-09-24

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