JPS57113463A - Locked-track resetting device of recorded-information reader - Google Patents

Locked-track resetting device of recorded-information reader

Info

Publication number
JPS57113463A
JPS57113463A JP18817780A JP18817780A JPS57113463A JP S57113463 A JPS57113463 A JP S57113463A JP 18817780 A JP18817780 A JP 18817780A JP 18817780 A JP18817780 A JP 18817780A JP S57113463 A JPS57113463 A JP S57113463A
Authority
JP
Japan
Prior art keywords
track
locked
amplifier
period
level
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
JP18817780A
Other languages
Japanese (ja)
Inventor
Toshihiko Hosaka
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.)
YUNIBAASARU PAIONIA KK
Pioneer Video Corp
Universal Pioneer Corp
Original Assignee
YUNIBAASARU PAIONIA KK
Pioneer Video Corp
Universal Pioneer 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 YUNIBAASARU PAIONIA KK, Pioneer Video Corp, Universal Pioneer Corp filed Critical YUNIBAASARU PAIONIA KK
Priority to JP18817780A priority Critical patent/JPS57113463A/en
Publication of JPS57113463A publication Critical patent/JPS57113463A/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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • 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
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To release a locked track securely by applying an offset signal with a prescribed level to the servo loop of a tracking servo means once detecting a locked track phenomenon. CONSTITUTION:Once a locked-track phenomenon occurs, a track error signal (a) outputted from an amplifier 8 varies greatly, and a reproduced RF envelope signal (c) outputted from an envelope detector 15 drops in level greately down nearly to zero during the period. This is compared with a reference level by a comparator 16, which generates a comparison output (e) with a high level during the period. Therefore, a switch 19 turns on during this period, and an offset voltage by an amplifier 18 is applied as disturbance to a servo loop through the amplifier 8. As a result, a tracking mirror 12 is driven forcibly to achieve reproduction from a track that it is following up at that time.
JP18817780A 1980-12-29 1980-12-29 Locked-track resetting device of recorded-information reader Pending JPS57113463A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18817780A JPS57113463A (en) 1980-12-29 1980-12-29 Locked-track resetting device of recorded-information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18817780A JPS57113463A (en) 1980-12-29 1980-12-29 Locked-track resetting device of recorded-information reader

Publications (1)

Publication Number Publication Date
JPS57113463A true JPS57113463A (en) 1982-07-14

Family

ID=16219106

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18817780A Pending JPS57113463A (en) 1980-12-29 1980-12-29 Locked-track resetting device of recorded-information reader

Country Status (1)

Country Link
JP (1) JPS57113463A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345352A1 (en) * 1987-08-01 1989-12-13 Sony Corporation Track-jump device for a disc device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345352A1 (en) * 1987-08-01 1989-12-13 Sony Corporation Track-jump device for a disc device

Similar Documents

Publication Publication Date Title
JPS54143109A (en) Optical information device
JPS6479942A (en) Information processor
JPS57113463A (en) Locked-track resetting device of recorded-information reader
ES8204868A1 (en) Optical focusing device with two controls
JPS5794913A (en) Data relieving method for error track
MY104528A (en) Optical disc servo apparatus.
JPS5542304A (en) Tracking mirror protector of optical information reader
JPS5242319A (en) Tracking control system for video signal reproduction set
JPS5273708A (en) Tracking control device of magnetic picture recording and reproducing apparatus
JPS575187A (en) Recorder
JPS55157127A (en) Automatic tracking unit
JPS5637866A (en) Disk player
JPS5280803A (en) Automatic focusing device
JPS5468208A (en) Automatic gain control system
JPS57181432A (en) Optical type disc reproducer
JPS6430030A (en) Optical disk device
JPS5798139A (en) Optical recorder and reproducer
JPS5573942A (en) Begining-of-tape setter for recording
JPS5733416A (en) Automatic gain control processing system
JPS5397324A (en) Recorded information reproducer
JPS5750323A (en) Video signal recording and reproducing device
JPS6421773A (en) Magnetic disk device
JPS5564641A (en) Magnetic recorder
JPS5792442A (en) Optical information recorder and reproducer
JPS5714903A (en) Digital servo device