JPS5589949A - Tracking servo unit in information read-out unit - Google Patents

Tracking servo unit in information read-out unit

Info

Publication number
JPS5589949A
JPS5589949A JP16389478A JP16389478A JPS5589949A JP S5589949 A JPS5589949 A JP S5589949A JP 16389478 A JP16389478 A JP 16389478A JP 16389478 A JP16389478 A JP 16389478A JP S5589949 A JPS5589949 A JP S5589949A
Authority
JP
Japan
Prior art keywords
tracking servo
signal
unit
detected
servo
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
JP16389478A
Other languages
Japanese (ja)
Other versions
JPS6051173B2 (en
Inventor
Takashi Okano
Yoshio Inamoto
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.)
Pioneer Video Corp
Pioneer Corp
Universal Pioneer Corp
Original Assignee
Pioneer Video Corp
Pioneer Electronic 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 Pioneer Video Corp, Pioneer Electronic Corp, Universal Pioneer Corp filed Critical Pioneer Video Corp
Priority to JP16389478A priority Critical patent/JPS6051173B2/en
Publication of JPS5589949A publication Critical patent/JPS5589949A/en
Publication of JPS6051173B2 publication Critical patent/JPS6051173B2/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

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)
  • Control Of Position Or Direction (AREA)

Abstract

PURPOSE:To enable to close the servo loop surely and stably at the start of operation of the tracking servo unit, by detecting the change in the phase relation between the tracking servo signal and reproduced RF signal. CONSTITUTION:In the tracking servo unit on the track Y of recording media with the information from the read-out means, the servo control spots E and F is produced for the error signal C corresponding to the distance from the center line of the track through the detection of the optoelectro converters 5, 6. The information read-out spot G is detected with the optoelectro converter 1 being RF signal and detected with the envelope detector 2. The output of envelope detection and the said error signal are detected for the phase difference and when the polarity of the phase difference is changed, the instruction signal which closes the servo loop of the tracking servo means is produced.
JP16389478A 1978-12-27 1978-12-27 Tracking servo device in information reading device Expired JPS6051173B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16389478A JPS6051173B2 (en) 1978-12-27 1978-12-27 Tracking servo device in information reading device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16389478A JPS6051173B2 (en) 1978-12-27 1978-12-27 Tracking servo device in information reading device

Publications (2)

Publication Number Publication Date
JPS5589949A true JPS5589949A (en) 1980-07-08
JPS6051173B2 JPS6051173B2 (en) 1985-11-12

Family

ID=15782820

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16389478A Expired JPS6051173B2 (en) 1978-12-27 1978-12-27 Tracking servo device in information reading device

Country Status (1)

Country Link
JP (1) JPS6051173B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580255A (en) * 1982-05-31 1986-04-01 Hitachi, Ltd. Servo circuit for a signal reproducing apparatus
JPS6185634A (en) * 1984-10-03 1986-05-01 Nakamichi Corp Optical recording and reproducing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580255A (en) * 1982-05-31 1986-04-01 Hitachi, Ltd. Servo circuit for a signal reproducing apparatus
JPS6185634A (en) * 1984-10-03 1986-05-01 Nakamichi Corp Optical recording and reproducing device

Also Published As

Publication number Publication date
JPS6051173B2 (en) 1985-11-12

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