GB2022874A - Automatic Azimuth Correction of Magnetic Head Gaps - Google Patents

Automatic Azimuth Correction of Magnetic Head Gaps

Info

Publication number
GB2022874A
GB2022874A GB7918351A GB7918351A GB2022874A GB 2022874 A GB2022874 A GB 2022874A GB 7918351 A GB7918351 A GB 7918351A GB 7918351 A GB7918351 A GB 7918351A GB 2022874 A GB2022874 A GB 2022874A
Authority
GB
United Kingdom
Prior art keywords
magnetic head
azimuth correction
head gaps
signal
automatic azimuth
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
GB7918351A
Other versions
GB2022874B (en
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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
Priority claimed from NL7805801A external-priority patent/NL7805801A/en
Priority claimed from NL7805803A external-priority patent/NL7805803A/en
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB2022874A publication Critical patent/GB2022874A/en
Application granted granted Critical
Publication of GB2022874B publication Critical patent/GB2022874B/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
    • 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
    • G11B5/56—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 support for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering

Landscapes

  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

A method of, and apparatus for, detecting an angular deviation of an audio reproducing head and producing a signal for correcting the head position if required. In order to avoid the need to provide one or more additional tracks containing identical signals for use in detecting head deviation the upper and lower halves of an information track are scanned simultaneously and the time difference between the zero passages of the signals is determined and is used to derive a signal for the compensation of the angular error. <IMAGE>
GB7918351A 1978-05-29 1979-05-25 Automatic azimuth correction of magnetic head gaps Expired GB2022874B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7805801A NL7805801A (en) 1978-05-29 1978-05-29 MAGNET HEAD.
NL7805803A NL7805803A (en) 1978-05-29 1978-05-29 AZIMUTH CORRECTION OF CUTS.

Publications (2)

Publication Number Publication Date
GB2022874A true GB2022874A (en) 1979-12-19
GB2022874B GB2022874B (en) 1983-04-27

Family

ID=26645425

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7918351A Expired GB2022874B (en) 1978-05-29 1979-05-25 Automatic azimuth correction of magnetic head gaps

Country Status (10)

Country Link
AT (1) AT365355B (en)
AU (1) AU530671B2 (en)
CH (1) CH647613A5 (en)
DE (1) DE2920912A1 (en)
ES (1) ES8100518A1 (en)
FR (1) FR2427659B1 (en)
GB (1) GB2022874B (en)
IT (1) IT1118702B (en)
NO (1) NO151101C (en)
NZ (1) NZ190547A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119829A2 (en) * 1983-03-14 1984-09-26 Dolby Laboratories Licensing Corporation Improvements in apparatus for reproducing motion picture film photographic sound-tracks
US4517612A (en) * 1981-08-17 1985-05-14 U.S. Philips Corporation Reproducing apparatus with controlled gain output independent of tracking errors
US4525696A (en) * 1980-11-28 1985-06-25 Minnesota Mining & Manufacturing Company Driver for rotating a magnetic playback head

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3521437A1 (en) * 1983-11-29 1986-12-18 Sharp K.K., Osaka MULTI-TRACK MAGNETIC TAPE DEVICE AND METHOD FOR TRACKING ITS PLAYBACK HEADS
DE3546829C2 (en) * 1983-11-29 1992-11-19 Sharp K.K., Osaka, Jp Multi-track magnetic tape system with track alignment control
KR101141895B1 (en) 2004-12-31 2012-05-03 신세스 게엠바하 Intramedullary Nail

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2938962A (en) * 1955-07-12 1960-05-31 Konins Azimuth seeking reproducing head
US3246307A (en) * 1962-05-22 1966-04-12 Ibm Servo positioning system for magnetic disk file
NL154607B (en) * 1966-03-09 1977-09-15 Philips Nv MAGNETIC HEAD SYSTEM EQUIPPED WITH TWO MAGNETIC CONTROL CIRCUITS FOR CORRECT POSITIONING ON A TRACK.
US3526726A (en) * 1967-09-27 1970-09-01 Ampex Piezoelectric transducer assembly for positioning a magnetic record/reproduce head
US3678220A (en) * 1971-05-26 1972-07-18 Ibm Angulated positioning marks for moving web
US3900888A (en) * 1972-10-03 1975-08-19 Nakamichi Research Process for detecting and adjusting a vertical orientation of magnetic heads and apparatus therefor
NL7309590A (en) * 1973-07-10 1975-01-14 Philips Nv DEVICE FOR CONTROLLING THE POSITION OF A MAGNETIC HEAD WITH REGARD TO AN INFORMATION TRACK TO BE TRACKED.
GB1470735A (en) * 1975-06-18 1977-04-21 Ibm Servo positioning systems for magnetic disc recording
US4055849A (en) * 1976-04-15 1977-10-25 Eastman Kodak Company Magnetic head positioning and playback apparatus utilizing a split head for self-tracking and selective reproduction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525696A (en) * 1980-11-28 1985-06-25 Minnesota Mining & Manufacturing Company Driver for rotating a magnetic playback head
US4517612A (en) * 1981-08-17 1985-05-14 U.S. Philips Corporation Reproducing apparatus with controlled gain output independent of tracking errors
EP0119829A2 (en) * 1983-03-14 1984-09-26 Dolby Laboratories Licensing Corporation Improvements in apparatus for reproducing motion picture film photographic sound-tracks
EP0119829A3 (en) * 1983-03-14 1986-09-03 Dolby Laboratories Licensing Corporation Improvements in apparatus for reproducing motion picture film photographic sound-tracks

Also Published As

Publication number Publication date
GB2022874B (en) 1983-04-27
NZ190547A (en) 1982-03-16
ES480924A0 (en) 1980-11-01
IT1118702B (en) 1986-03-03
AT365355B (en) 1982-01-11
ATA392579A (en) 1981-05-15
CH647613A5 (en) 1985-01-31
DE2920912C2 (en) 1987-04-02
AU530671B2 (en) 1983-07-28
NO151101C (en) 1985-02-06
NO791725L (en) 1979-11-30
FR2427659A1 (en) 1979-12-28
ES8100518A1 (en) 1980-11-01
NO151101B (en) 1984-10-29
AU4748779A (en) 1979-12-06
DE2920912A1 (en) 1979-12-13
IT7968132A0 (en) 1979-05-25
FR2427659B1 (en) 1988-06-24

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19990524