JPS619842A - Optical disc tracking system - Google Patents

Optical disc tracking system

Info

Publication number
JPS619842A
JPS619842A JP13008384A JP13008384A JPS619842A JP S619842 A JPS619842 A JP S619842A JP 13008384 A JP13008384 A JP 13008384A JP 13008384 A JP13008384 A JP 13008384A JP S619842 A JPS619842 A JP S619842A
Authority
JP
Japan
Prior art keywords
signal
tracking
frequencies
frequency
make accurate
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
JP13008384A
Other languages
Japanese (ja)
Inventor
Hisashi Yamada
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP13008384A priority Critical patent/JPS619842A/en
Publication of JPS619842A publication Critical patent/JPS619842A/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
    • G11B7/0901—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 track following only
    • 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
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track

Abstract

PURPOSE:To make accurate tracking possible even in case of a large spot by multiplexing a tracking signal with a bit signal or changing the frequency of a carrier wave for every tracking to multiplex a signal which discriminates an adjacent track and detecting the signal of the adjacent track. CONSTITUTION:The tracking signal is multiplexed with a signal having a certain spectrum width and is recorded in the state where the latter signal is recorded, and the tracking signal is detected to perform tracking. The tracking signal has the frequency changed for every track, and the signal having three frequencies at least is required for the purpose of making signals of adjacent tracks different from each other. If five frequencies are prepared, signals of adjacent tracks are always different in frequency to make accurate control possible; and further, detectors 41-45 of frequencies f1-f5 are provided after addition of auxiliary beams, and individual combinations are compared by comparators 51-55 to make accurate control possible.
JP13008384A 1984-06-26 1984-06-26 Optical disc tracking system Pending JPS619842A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13008384A JPS619842A (en) 1984-06-26 1984-06-26 Optical disc tracking system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13008384A JPS619842A (en) 1984-06-26 1984-06-26 Optical disc tracking system

Publications (1)

Publication Number Publication Date
JPS619842A true JPS619842A (en) 1986-01-17

Family

ID=15025571

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13008384A Pending JPS619842A (en) 1984-06-26 1984-06-26 Optical disc tracking system

Country Status (1)

Country Link
JP (1) JPS619842A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62239342A (en) * 1986-04-08 1987-10-20 Nec Corp Optical disk medium
JPH02134729A (en) * 1988-11-16 1990-05-23 Matsushita Electric Ind Co Ltd Recording and reproducing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5764336A (en) * 1980-10-02 1982-04-19 Fujitsu Ltd Track signal recording system of optical disk device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5764336A (en) * 1980-10-02 1982-04-19 Fujitsu Ltd Track signal recording system of optical disk device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62239342A (en) * 1986-04-08 1987-10-20 Nec Corp Optical disk medium
JPH02134729A (en) * 1988-11-16 1990-05-23 Matsushita Electric Ind Co Ltd Recording and reproducing device

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