JPS57120275A - Tracking servo lead-in system of recorded information reader - Google Patents

Tracking servo lead-in system of recorded information reader

Info

Publication number
JPS57120275A
JPS57120275A JP56006904A JP690481A JPS57120275A JP S57120275 A JPS57120275 A JP S57120275A JP 56006904 A JP56006904 A JP 56006904A JP 690481 A JP690481 A JP 690481A JP S57120275 A JPS57120275 A JP S57120275A
Authority
JP
Japan
Prior art keywords
pickup
signal
point
detection signal
tracking 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
JP56006904A
Other languages
Japanese (ja)
Other versions
JPH0121552B2 (en
Inventor
Hiroyuki Hirano
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 Corp
Original Assignee
Pioneer Corp
Pioneer Electronic 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 Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP56006904A priority Critical patent/JPS57120275A/en
Priority to JP56006905A priority patent/JPS57120276A/en
Publication of JPS57120275A publication Critical patent/JPS57120275A/en
Publication of JPH0121552B2 publication Critical patent/JPH0121552B2/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
    • G11B7/085—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
    • G11B7/08517—Methods for track change, selection or preliminary positioning by moving the head with tracking pull-in only

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)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To lead a pickup to a tracking servo system stably by reducing the movement speed of the pickup while the pickup moves from some point between recording tracks to the center of one recording track. CONSTITUTION:After a tracking error signal D is passed through an LPF18, zero-cross detection 19 is performed to generate a detection signal E. The detection signal E is generated synchronously when spot light 1 crosses the nearly center point of a recording track and when it crosses a point between recording tracks. A comparision output C generated when an envelope signal B of a carrier has a constant value and more and the detection signal E are inputted to a timing control circuit 20 to generate a control signal F for the control of a selection switch 14. In an area where servocontrol increases the relative speed between the tracks and pickup, phase characteristics of a servo loop are inverted through the selection of the selection switch 14 to decrease the relative speed.
JP56006904A 1981-01-19 1981-01-19 Tracking servo lead-in system of recorded information reader Granted JPS57120275A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56006904A JPS57120275A (en) 1981-01-19 1981-01-19 Tracking servo lead-in system of recorded information reader
JP56006905A JPS57120276A (en) 1981-01-19 1981-01-19 Tracking servo lead-in system of recorded information reader

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56006904A JPS57120275A (en) 1981-01-19 1981-01-19 Tracking servo lead-in system of recorded information reader
JP56006905A JPS57120276A (en) 1981-01-19 1981-01-19 Tracking servo lead-in system of recorded information reader

Publications (2)

Publication Number Publication Date
JPS57120275A true JPS57120275A (en) 1982-07-27
JPH0121552B2 JPH0121552B2 (en) 1989-04-21

Family

ID=26341126

Family Applications (2)

Application Number Title Priority Date Filing Date
JP56006905A Granted JPS57120276A (en) 1981-01-19 1981-01-19 Tracking servo lead-in system of recorded information reader
JP56006904A Granted JPS57120275A (en) 1981-01-19 1981-01-19 Tracking servo lead-in system of recorded information reader

Family Applications Before (1)

Application Number Title Priority Date Filing Date
JP56006905A Granted JPS57120276A (en) 1981-01-19 1981-01-19 Tracking servo lead-in system of recorded information reader

Country Status (1)

Country Link
JP (2) JPS57120276A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57147168A (en) * 1981-03-05 1982-09-10 Matsushita Electric Ind Co Ltd Jumping scanner
JPS5938936A (en) * 1982-08-28 1984-03-03 Sony Corp Servo control circuit of information reproducer
JPS59185077A (en) * 1983-04-05 1984-10-20 Pioneer Electronic Corp Tracking servo lock-in device
JPS62170081A (en) * 1985-12-10 1987-07-27 ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Method and apparatus for searching track of disc-like rotaryinformation carrier
JPS6356883A (en) * 1986-08-28 1988-03-11 Matsushita Commun Ind Co Ltd Positioning method
EP0296338A2 (en) * 1987-06-25 1988-12-28 Mitsubishi Denki Kabushiki Kaisha Optical disc system

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58143472A (en) * 1982-02-22 1983-08-26 Hitachi Ltd Tracking servo controller of recording information reproducing device
JPS59171087A (en) * 1983-03-18 1984-09-27 Pioneer Electronic Corp Tracking servo leading-in system
JP2500417Y2 (en) * 1983-11-01 1996-06-05 パイオニア株式会社 Tracking servo retractor
JPS60256927A (en) * 1984-06-01 1985-12-18 Nippon Gakki Seizo Kk Read controller of optical disc reproducing device
JPS6185635A (en) * 1984-10-02 1986-05-01 Yokogawa Hokushin Electric Corp Optical disc device
JPH09136266A (en) * 1995-09-13 1997-05-27 Wakui Seisakusho:Kk Wrench for bolt with polygonal hole
US7186190B1 (en) 2002-11-08 2007-03-06 Taylor Made Golf Company, Inc. Golf club head having movable weights
US8206244B2 (en) 2008-01-10 2012-06-26 Adams Golf Ip, Lp Fairway wood type golf club

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598893B2 (en) * 1975-03-17 1984-02-28 株式会社日立製作所 information reproducing device
JPS5433724A (en) * 1977-08-20 1979-03-12 Utsumi Denki Seisakushiyo Yuug Afterrrecording and compilation system and apparatus for movie

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57147168A (en) * 1981-03-05 1982-09-10 Matsushita Electric Ind Co Ltd Jumping scanner
JPH039554B2 (en) * 1981-03-05 1991-02-08 Matsushita Electric Ind Co Ltd
JPS5938936A (en) * 1982-08-28 1984-03-03 Sony Corp Servo control circuit of information reproducer
JPH0526253B2 (en) * 1982-08-28 1993-04-15 Sony Corp
JPS59185077A (en) * 1983-04-05 1984-10-20 Pioneer Electronic Corp Tracking servo lock-in device
JPH0154794B2 (en) * 1983-04-05 1989-11-21 Pioneer Electronic Corp
JPS62170081A (en) * 1985-12-10 1987-07-27 ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Method and apparatus for searching track of disc-like rotaryinformation carrier
JPS6356883A (en) * 1986-08-28 1988-03-11 Matsushita Commun Ind Co Ltd Positioning method
EP0296338A2 (en) * 1987-06-25 1988-12-28 Mitsubishi Denki Kabushiki Kaisha Optical disc system

Also Published As

Publication number Publication date
JPH0121552B2 (en) 1989-04-21
JPS634271B2 (en) 1988-01-28
JPS57120276A (en) 1982-07-27

Similar Documents

Publication Publication Date Title
JPS57120275A (en) Tracking servo lead-in system of recorded information reader
EP0189187B1 (en) Magnetic-optical disc memory system
US4544872A (en) Tracking servo control system for an information read-out system
JPS5658141A (en) Tracking servo read-in device for information reader
JPS6464125A (en) Optical recording and reproducing method
ES8400833A1 (en) Apparatus for reading a disk-shaped record carrier
JPS57176568A (en) Relative movement controller between pickup and recording track for information reader
JPS6479942A (en) Information processor
JPS5313309A (en) Optically reproducing unit
KR900003004B1 (en) Disk player
JPS5538686A (en) Tracking controller of optical information reader
JPS5532239A (en) Reproducing device
EP0441969A4 (en) Seek circuit of optical disk
US5235577A (en) Information recording and/or reproducing apparatus for timing switching of a jumping pulse from an intermittently detected tracking signal
AU585764B2 (en) Apparatus for enabling an autotrack circuit of an optical disc reading apparatus during the positioning of a read beam
JPS5764337A (en) Track retrieval device
JPH02105336A (en) Tracking servo device
MY116645A (en) Improved optical disc tracking control
JPS6427036A (en) Optical information recording and reproducing device
JPS57103165A (en) Disk player
KR0175405B1 (en) A track counting algorithm of compact disc player
JPS5532240A (en) Reproducing device
JPS57172532A (en) Writing system for optical disk
JPS56148745A (en) Optical recorder and reproducer
JPS5744234A (en) Optical servo device