JPS56156971A - System for locating magnetic head - Google Patents

System for locating magnetic head

Info

Publication number
JPS56156971A
JPS56156971A JP5762280A JP5762280A JPS56156971A JP S56156971 A JPS56156971 A JP S56156971A JP 5762280 A JP5762280 A JP 5762280A JP 5762280 A JP5762280 A JP 5762280A JP S56156971 A JPS56156971 A JP S56156971A
Authority
JP
Japan
Prior art keywords
pulses
servo
error signals
detected
tracks
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
JP5762280A
Other languages
Japanese (ja)
Inventor
Etsuro Yamazaki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5762280A priority Critical patent/JPS56156971A/en
Publication of JPS56156971A publication Critical patent/JPS56156971A/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
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

PURPOSE:To demodulate position error signals with high sensitivity and high stability by deriving the position error signals from position pulses of respective tracks when the levels of synchronizing pulses detected from plural servo tracks are below prescribed values. CONSTITUTION:Four kinds of servo tracks are formed in the servo sector provided on a data disc surface, and a synchronizing pulse bit cell and a position pulse bit cell having prescribed phase and polarity are disposed in each track. The index pulses indicating the begining of the servo sectors are detected 12, and a synchronizing pulse detecting circuit 13 is operated by the detected outputs. When the absolute value of the synchronizing pulse is below reference voltage VR, -VR, the operation of a gate circuit 14 operating at prescribed periods is stopped. Position error signals are formed 17-19 by taking the differences in the positive and negative peak holding values of the position pulses obtained from the respective servo tracks in the state that there are no gate pulses.
JP5762280A 1980-04-30 1980-04-30 System for locating magnetic head Pending JPS56156971A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5762280A JPS56156971A (en) 1980-04-30 1980-04-30 System for locating magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5762280A JPS56156971A (en) 1980-04-30 1980-04-30 System for locating magnetic head

Publications (1)

Publication Number Publication Date
JPS56156971A true JPS56156971A (en) 1981-12-03

Family

ID=13060971

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5762280A Pending JPS56156971A (en) 1980-04-30 1980-04-30 System for locating magnetic head

Country Status (1)

Country Link
JP (1) JPS56156971A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5798885A (en) * 1994-06-06 1998-08-25 Fujitsu Limited Head positioning control for disk apparatus using peak detection, polarity detection and sector mark detection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5798885A (en) * 1994-06-06 1998-08-25 Fujitsu Limited Head positioning control for disk apparatus using peak detection, polarity detection and sector mark detection
US5963398A (en) * 1994-06-06 1999-10-05 Fujitsu Limited Disk apparatus with voice coil motor
US6016547A (en) * 1994-06-06 2000-01-18 Fujitsu Limited Data processing apparatus with program allocating section for selectively allocating programs in first and second memory
US6137646A (en) * 1994-06-06 2000-10-24 Fujitsu Limited Disk apparatus using coincidence detection to generate variable sector pulses

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