JPS55132537A - Track access system - Google Patents

Track access system

Info

Publication number
JPS55132537A
JPS55132537A JP3976779A JP3976779A JPS55132537A JP S55132537 A JPS55132537 A JP S55132537A JP 3976779 A JP3976779 A JP 3976779A JP 3976779 A JP3976779 A JP 3976779A JP S55132537 A JPS55132537 A JP S55132537A
Authority
JP
Japan
Prior art keywords
track
laser beam
eccentricity
moment
disc
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
JP3976779A
Other languages
Japanese (ja)
Other versions
JPS5747491B2 (en
Inventor
Hiroshi Horikawa
Shigeki Ogawa
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP3976779A priority Critical patent/JPS55132537A/en
Publication of JPS55132537A publication Critical patent/JPS55132537A/en
Publication of JPS5747491B2 publication Critical patent/JPS5747491B2/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
    • 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 Head For Track Selection And Changing (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To enable to follow the laser beam by shifting it to desired recording track, by performing the track servo control again at the moment when the desired track is shifted at the position of the laser beam by the eccentricity of disc of recording media. CONSTITUTION:The trigger pulse giving the timing of selection is produced with the positive direction selection pulse generator 11 producing pulses in synchronizing with the eccentricity of the disc 3 of the recording media or negative selection pulse generator 12 and the positive reference signal 15 or negative reference signal 16, the analog switch 7 is OFF, the integration is stopped with zero input to the differential integrator 8, and the polarizer 2 is fixed at the position. Next, the delay circuit 13 is controlled with RAM14 and track servo control is made at the moment when the desired recording track comes to the position of laser beam by the eccentricity, the switch 7 is ON, the deflector 2 is driven with the closed loop consisting of the compensation circuit 10 and the deflection drive circuit 9, and laser beam follows the track.
JP3976779A 1979-04-04 1979-04-04 Track access system Granted JPS55132537A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3976779A JPS55132537A (en) 1979-04-04 1979-04-04 Track access system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3976779A JPS55132537A (en) 1979-04-04 1979-04-04 Track access system

Publications (2)

Publication Number Publication Date
JPS55132537A true JPS55132537A (en) 1980-10-15
JPS5747491B2 JPS5747491B2 (en) 1982-10-09

Family

ID=12562078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3976779A Granted JPS55132537A (en) 1979-04-04 1979-04-04 Track access system

Country Status (1)

Country Link
JP (1) JPS55132537A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5984353A (en) * 1982-11-04 1984-05-16 Pioneer Electronic Corp Information reading device
WO1989001223A1 (en) * 1987-08-01 1989-02-09 Sony Corporation Track-jump device for a disc device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5984353A (en) * 1982-11-04 1984-05-16 Pioneer Electronic Corp Information reading device
US5079756A (en) * 1987-01-08 1992-01-07 Sony Corporation Track-jump device for a disc drive apparatus
WO1989001223A1 (en) * 1987-08-01 1989-02-09 Sony Corporation Track-jump device for a disc device
US5101390A (en) * 1987-08-01 1992-03-31 Sony Corporation Track-jump device for a disc drive apparatus

Also Published As

Publication number Publication date
JPS5747491B2 (en) 1982-10-09

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