Patent US3662119A successfully refreshed from Google Patents.
US3662119A
Expired / Lapsed
US
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Thin film magnetic transducer head
Assignee: International Business Machines Corp
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Filing: 1970-06-30
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Granted: 1972-05-09
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Expires: 1990-06-30
Abstract
Abstract A rectangular thin film transducer head includes a magnetic core composed of overlapping laminations of permalloy film joined together magnetically and electrically, near an air gap, at one end of the rectangle, between the two laminations, which gap couples flux to the magnetic recording medium. Two electrically parallel insulated thin film copper windings starting at the end opposite the gap are deposited about the core joining electrically at the end adjacent to the gap to a conductor coupled to both permalloy laminations which conduct return current through the legs of the core inside of the windings. Alternatively, a single series winding passes around the core and through the gap. The head is manufactured by means of photolithographic, vacuum, and thin film techniques.
Inventors
- 👤 Lubomyr T Romankiw
- 👤 George A Wardly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:21
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/31; G11B5/3109; G11B5/313; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49044; Y10T29/4906; Y10T29/49064
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
33 words
Apparatus in accordance with claim 1 wherein said windings are formed on separate layers and are generally in complementary chevron shaped patterns with one half of each chevron stripe on a separate layer.
Claim 2
Dependent Claim
46 words
A thin film transducer head comprising a plural layer integral core of magnetic material forming a gap between overlapping segments thereof, said core including a central space without magnetic material and thin film windings about said core, and current from said windings passing through said core.
Claim 3
Dependent Claim
54 words
A thin film transducer head comprising a plural layer integral core of magnetic material forming a gap between overlapping segments thereof, said core including a central space without magnetic material and thin film windings about said core, said windings being electrically connected in parallel, and said windings being connected in series with said core.
Claim 4
Dependent Claim
16 words
A head in accordance with claim 4 wherein current through said windings passes through said gap.
Claim 5
Dependent Claim
78 words
A thin film transducer head comprising a plural layer integral core of magnetic material forming a gap between overlapping segments thereof, said core including a central space without magnetic material and thin film windings about said core said windings being electrically connected in parallel, and electrical return current passing from the windings returns through the core passing through a winding for current flowing through an electrical circuit including the windings of the coil and the core in series.
Claim 6
Dependent Claim
62 words
A magnetic head comprising a magnetic core formed in a plurality of layers and joined at one point to form a unitary magnetic core having a gap, a plurality of windings electrically in parallel about said core connected to said core as an electrical return path for current flowing through an electrical circuit including said windings and said core connected in series.
Claim 7
Dependent Claim
55 words
A transducer head comprising a core of magnetic material including two arms with parallel windings about both of said arms with bridging connections between respective loops of the windings on each arm so as to provide alternate electrical paths around the core for improved reliability in the event of failure of at least one loop.
Claim 8
Dependent Claim
17 words
A transducer head in accordance with claim 8 whereiN said core comprises a plural layer integral core.
References Cited (Backward Citations)
US3344237A
Cited
US2978545A
Cited
US2933721A
Cited
US3513391A
Cited
US3480935A
Cited
FR1524322A
Cited
US3549825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |