JPS57212632A - Information recording medium and information recording device for it - Google Patents

Information recording medium and information recording device for it

Info

Publication number
JPS57212632A
JPS57212632A JP9669381A JP9669381A JPS57212632A JP S57212632 A JPS57212632 A JP S57212632A JP 9669381 A JP9669381 A JP 9669381A JP 9669381 A JP9669381 A JP 9669381A JP S57212632 A JPS57212632 A JP S57212632A
Authority
JP
Japan
Prior art keywords
recorded
information recording
track
light
light spot
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
JP9669381A
Other languages
Japanese (ja)
Inventor
Seiji Yonezawa
Ryuichi Koike
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9669381A priority Critical patent/JPS57212632A/en
Publication of JPS57212632A publication Critical patent/JPS57212632A/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
    • G11B7/08—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

  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

PURPOSE:To prevent the deviation between tracking signals even in case of an error in aligning optical systems, by providing an information-recordable blank area between tracking grooves where pulse signals differing in frequency are recorded alternately as the tracking signals. CONSTITUTION:Laser light radiated from a laser light source 1 forms a fine light spot 4 on a disk 3 through a condenser lens 2. On the disk 3, plural pulse signals differing in frequency are recorded concentrically and alternately as projecting and recessed or light and dark track grooves 5, 6 and 7, so the light spot 4 is dirfracted. Then, its diffracted reflected light is passed through a half-mirror 2' and photodetected by a photodetector 9, where it is transduced into an electric signal to compare the output levels of respective frequency components; and deviation from the center of a track 8 on which information is recorded is detected by an error signal, which is used to exercise control so that the light spot 4 is in the center of the blank track 8.
JP9669381A 1981-06-24 1981-06-24 Information recording medium and information recording device for it Pending JPS57212632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9669381A JPS57212632A (en) 1981-06-24 1981-06-24 Information recording medium and information recording device for it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9669381A JPS57212632A (en) 1981-06-24 1981-06-24 Information recording medium and information recording device for it

Publications (1)

Publication Number Publication Date
JPS57212632A true JPS57212632A (en) 1982-12-27

Family

ID=14171851

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9669381A Pending JPS57212632A (en) 1981-06-24 1981-06-24 Information recording medium and information recording device for it

Country Status (1)

Country Link
JP (1) JPS57212632A (en)

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