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Multitrack Probe Type Recording Transducer

IP.com Disclosure Number: IPCOM000097675D
Original Publication Date: 1961-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Flora, J: AUTHOR [+2]

Abstract

A thin magnetic film 1 of NiFe is deposited on an elongated, low permeability substrate 2 which has a longitudinal air gap 3. Film 1 has a substantially square loop hysterisis characteristic in the longitudinal direction (arrow 4). It has practically no remanent magnitization in the transverse direction (arrow 5). A pair of switching coils 6 and 7 are wound on each end of the transducer to provide opposing magnetic fields. These saturate film 1 in the longitudinal direction in their respective areas of influence.

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Multitrack Probe Type Recording Transducer

A thin magnetic film 1 of NiFe is deposited on an elongated, low permeability substrate 2 which has a longitudinal air gap 3. Film 1 has a substantially square loop hysterisis characteristic in the longitudinal direction (arrow 4). It has practically no remanent magnitization in the transverse direction (arrow 5). A pair of switching coils 6 and 7 are wound on each end of the transducer to provide opposing magnetic fields. These saturate film 1 in the longitudinal direction in their respective areas of influence.

A magnetic null (arrow 8) is therefore established in an incremental portion 9 of the film where the respective fields meet and return across the longitudinal gap
3. The width of the null 8 is controlled by the magnitude of the currents supplied to the coils 6 and 7. The location of null 8 is determined by the ratio of these currents. A read-write coil 10 is wound on the transducer to provide a magnetic field normal to the fields created by coils 6 and 7.

By establishing the correct current ratio, the magnetic null 8 is positioned in registry with a selected track on the magnetic record 11 for transfer of intelligence. Intelligence signals are recorded on the selected track by energizing the read-write coil 10 with appropriate data signals. Similarly, flux changes in the selected track on the record 11 are transmitted through the null area 8 to induce signals in read-write coil 10 to provide a read signal.

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