US3639699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer having a composite magnetic core structure
Assignee: General Electric Co
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Filing: 1970-02-27
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Granted: 1972-02-01
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Expires: 1990-02-27
Abstract
Abstract A magnetic transducer for read-write applications is disclosed in which a composite core having two closely spaced legs is provided with each leg having one layer of magnetic material of higher permeability and lower saturation flux density than the second layer of that leg. The read-write conductor means is positioned between the two legs and is thereby inductively coupled to the core. The higher permeability layer is narrow in a direction perpendicular to both the length of the leg and the thickness of the layer, is adjacent the conductor means and is saturated at flux densities encountered in writing so that the wider lower permeability outer layers of the two legs are effective during writing and the higher permeability narrower layers are effective or dominant during reading. In a modification, a composite shim is employed in the gap of a more conventional stacked lamination head to obtain some of the advantages of the present invention.
Inventors
- 👤 Jerome J Tiemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:57
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3109; G11B5/313; G11B5/187; G11B5/245; G11B5/2452; G11B5/3143
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A read-write head comprising a magnetic core having a pair of legs in series magnetic relation, read-write conductor means inductively coupled to said legs and passing therebetween, each leg comprising two superimposed layers, each of a different magnetic material, the magnetic material of the layers closest to said conductor means have a substantially higher permeability and lower saturation flux density than the other layers.
Claim 2
Dependent Claim
64 words
A read-write head comprising a magnetic core having a pair of legs in series magnetic relation, read-write conductor means inductively coupled to said legs and passing therebetween, each leg comprising two superimposed layers, each of a different magnetic material, the magnetic material of the layers closest to said conductor means have a substantially higher permeability and lower saturation flux density than the other layers.
Claim 3
Dependent Claim
41 words
The read-write head of claim 1 wherein said one layer is physically narrower in a direction perpendicular both to the thickness of the layer and to the length of the leg of which it is a part than the other layer.
Claim 4
Dependent Claim
32 words
The read-write head of claim 1 wherein said one layer saturates at flux densities therein during writing so that the other layer of each leg provides the dominant magnetic circuit during writing.
Claim 5
Dependent Claim
71 words
A read-write head comprising a magnetic core having a pair of legs in series magnetic relation, read-write conductor means inductively coupled to said core and passing between the legs thereof, each leg comprising two superimposed layers, each of magnetic material having different initial permeability, the layers having higher permeability being adjacent said read-write conductor means so that the last-mentioned layers dominate the magnetic characteristics of said head during the read operation.
Claim 6
Dependent Claim
71 words
A read-write head comprising a magnetic core having a pair of legs in series magnetic relation, read-write conductor means inductively coupled to said core and passing between the legs thereof, each leg comprising two superimposed layers, each of magnetic material having different initial permeability, the layers having higher permeability being adjacent said read-write conductor means so that the last-mentioned layers dominate the magnetic characteristics of said head during the read operation.
Claim 7
Dependent Claim
46 words
The read-write head of claim 4 where the axis of easy magnetization of the layers adjacent said conductor being parallel to the width of said layers and the axis of easy magnetization of the other two layers being parallel to the length of said layers. core.
Claim 8
Dependent Claim
26 words
The read-write head of claim 4 wherein the width of the magnetic layers adjacent the read-write conductor means is narrower than the other of said layers.
Claim 9
Dependent Claim
106 words
A read-write head comprising a magnetic core having a stack of laminations of magnetic material terminating in spaced opposed pole faces defining a gap and a composite shim including a layer of magnetic material adjacent each pole face having a substantially higher permeability and lower saturation flux density than the magnetic material of said core and a layer of nonmagnetic material interposed between said layers of magnetic material, said composite shim having a lesser width dimension than that of the stack of laminations of said core for providing a narrower effective head during reading than during writing and read-write conductor means inductively coupled to said core.
Claim 10
Dependent Claim
106 words
A read-write head comprising a magnetic core having a stack of laminations of magnetic material terminating in spaced opposed pole faces defining a gap and a composite shim including a layer of magnetic material adjacent each pole face having a substantially higher permeability and lower saturation flux density than the magnetic material of said core and a layer of nonmagnetic material interposed between said layers of magnetic material, said composite shim having a lesser width dimension than that of the stack of laminations of said core for providing a narrower effective head during reading than during writing and read-write conductor means inductively coupled to said core.
References Cited (Backward Citations)
US3344237A
Cited
US2711945A
Cited
US3057967A
Cited
US3194894A
Cited
US3365709A
Cited
US3480736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |