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1. WO1989009467 - RECORDING SYSTEM HAVING HEAD TRANSDUCERS WITH CONTROLLED SKEW

Publication Number WO/1989/009467
Publication Date 05.10.1989
International Application No. PCT/US1989/001053
International Filing Date 14.03.1989
Chapter 2 Demand Filed 13.11.1989
IPC
G11B 20/22 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
20Signal processing not specific to the method of recording or reproducing; Circuits therefor
22for reducing distortions
G11B 5/48 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads relative to record carriers
G11B 5/58 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads relative to record carriers
58with 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
G11B 5/584 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads relative to record carriers
58with 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
584for track following on tapes
CPC
G11B 20/225
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
20Signal processing not specific to the method of recording or reproducing; Circuits therefor
22for reducing distortions
225for reducing wow or flutter
G11B 5/488
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads ; or head supports; relative to record carriers
488Disposition of heads
G11B 5/58
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads ; or head supports; relative to record carriers
58with 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
G11B 5/584
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads ; or head supports; relative to record carriers
58with 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
584for track following on tapes
Applicants
  • CARLISLE MEMORY PRODUCTS GROUP INCORPORATED [US]/[US]
Inventors
  • EGGEBEEN, James, A.
Agents
  • STEVENS, Richard, L.
Priority Data
171,75522.03.1988US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) RECORDING SYSTEM HAVING HEAD TRANSDUCERS WITH CONTROLLED SKEW
(FR) SYSTEME D'ENREGISTREMENT AYANT DES TRANSDUCTEURS DE TETE AVEC OBLIQUITE COMMANDEE
Abstract
(EN)
A magnetic recording system using a dual layer magnetic medium with the servo tracks (30, 32) in the servo layer (26) being recorded at a first azimuth and the data tracks (38) in the data layer (28) being recorded at a different azimuth than the servo tracks (30, 32) to avoid interference between the servo and data information. The servo tracks (30, 32) are recorded with one of two frequencies, with adjacent servo tracks (30, 32) having different frequencies. The servo tracks (30, 32) are read by a first transducer (46) having the same azimuth as the servo tracks (30, 32) to generate a positioning error to control transducer position. The servo information is also used to control synchronization during reading and writing by the data transducer (48).
(FR)
Le système d'enregistrement magnétique décrit dans la présente invention utilise un support magnétique à double couche dont les servo-pistes (30, 32) de la servo-couche (26) sont enregistrées à un premier azimut et dont les pistes de données (38) de la couche de données (28) sont enregistrées à un azimut différent de celui des servo-pistes (30, 32) pour éviter des interférences entre des informations d'asservissement et les informations de données. Les servo-pistes (30, 32) sont enregistrées à l'une des deux fréquences, les servo-pistes adjacentes (30, 32) ayant des fréquences différentes. Les servo-pistes (30, 32) sont lues par un premier transducteur (46) ayant le même azimut que les servo-pistes (30, 32) pour générer une erreur de positionnement afin de commander la position du transducteur. Les informations d'asservissement sont également utilisées pour commander la synchronisation pendant la lecture et l'écriture par le transducteur de données (48).
Also published as
Latest bibliographic data on file with the International Bureau