JPS51117005A - Tracking absorption equipment - Google Patents

Tracking absorption equipment

Info

Publication number
JPS51117005A
JPS51117005A JP50041334A JP4133475A JPS51117005A JP S51117005 A JPS51117005 A JP S51117005A JP 50041334 A JP50041334 A JP 50041334A JP 4133475 A JP4133475 A JP 4133475A JP S51117005 A JPS51117005 A JP S51117005A
Authority
JP
Japan
Prior art keywords
absorption equipment
tracking
tracking absorption
signal
equipment
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
JP50041334A
Other languages
Japanese (ja)
Other versions
JPS5925287B2 (en
Inventor
Moriji Izumida
Takeshi Maeda
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 JP50041334A priority Critical patent/JPS5925287B2/en
Publication of JPS51117005A publication Critical patent/JPS51117005A/en
Publication of JPS5925287B2 publication Critical patent/JPS5925287B2/en
Expired 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
    • G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0953—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for eccentricity of the disc or disc tracks

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To make it possible for a light spot to be absorbed into a track even if eccentricity is large by adding a signal of eccentric quantity and direction to a tracking servo-signal.
JP50041334A 1975-04-07 1975-04-07 information reproducing device Expired JPS5925287B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50041334A JPS5925287B2 (en) 1975-04-07 1975-04-07 information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50041334A JPS5925287B2 (en) 1975-04-07 1975-04-07 information reproducing device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2704984A Division JPS59171036A (en) 1984-02-17 1984-02-17 Track crossing detecting method of light spot

Publications (2)

Publication Number Publication Date
JPS51117005A true JPS51117005A (en) 1976-10-14
JPS5925287B2 JPS5925287B2 (en) 1984-06-16

Family

ID=12605611

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50041334A Expired JPS5925287B2 (en) 1975-04-07 1975-04-07 information reproducing device

Country Status (1)

Country Link
JP (1) JPS5925287B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5492155A (en) * 1977-12-29 1979-07-21 Matsushita Electric Ind Co Ltd Retrieval device
JPS5658140A (en) * 1979-10-13 1981-05-21 Pioneer Video Corp Tracking servo device for information reader
JPS5658141A (en) * 1979-10-16 1981-05-21 Pioneer Video Corp Tracking servo read-in device for information reader
JPS5764337A (en) * 1980-10-01 1982-04-19 Matsushita Electric Ind Co Ltd Track retrieval device
JPS5862837A (en) * 1981-10-12 1983-04-14 Nippon Columbia Co Ltd Disk reproducing device
JPS60121535A (en) * 1984-07-31 1985-06-29 Matsushita Electric Ind Co Ltd Detector for track crossing direction or shift amount of light beam

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5492155A (en) * 1977-12-29 1979-07-21 Matsushita Electric Ind Co Ltd Retrieval device
JPS5658140A (en) * 1979-10-13 1981-05-21 Pioneer Video Corp Tracking servo device for information reader
JPS5658141A (en) * 1979-10-16 1981-05-21 Pioneer Video Corp Tracking servo read-in device for information reader
JPS5764337A (en) * 1980-10-01 1982-04-19 Matsushita Electric Ind Co Ltd Track retrieval device
JPS5862837A (en) * 1981-10-12 1983-04-14 Nippon Columbia Co Ltd Disk reproducing device
JPS60121535A (en) * 1984-07-31 1985-06-29 Matsushita Electric Ind Co Ltd Detector for track crossing direction or shift amount of light beam

Also Published As

Publication number Publication date
JPS5925287B2 (en) 1984-06-16

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