Patent US4052749A successfully refreshed from Google Patents.
US4052749A
Expired / Lapsed
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Thin film magnetic head
Assignee: Panasonic Holdings Corp
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Filing: 1976-05-19
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Granted: 1977-10-04
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Expires: 1996-05-19
Abstract
Abstract A thin film magnetic head includes a magnetic core formed by first and second magnetic layers with at least one winding of conductor layer provided therebetween. Separating layers are provided to electrically isolate the conductor layer from its neighboring layers. The separating layers are semiconductor layers.
Inventors
- 👤 Noboru Nomura
- 👤 Kenji Kanai
- 👤 Nobuyuki Kaminaka
- 👤 Norimoto Nouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:12
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/17; G11B5/40
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
114 words
A thin film magnetic head comprising: first and second magnetic layers forming magnetic cores, said first and secod magnetic layers being magnetically connected at first ends thereof and forming a gap between second ends thereof; at least one conductor layer positioned between said first and second magnetic layers, said conductor layer comprising winding means through which current flows during use of the magnetic head; said at least one conductor layer having on each of two opposite sides thereof a separating layer means for separating and electrically isolating said conductor layer from adjacent layers; and said separating layer means on at least one side of said at least one conductor layer including a semiconductor layer.
Claim 2
Dependent Claim
114 words
A thin film magnetic head comprising: first and second magnetic layers forming magnetic cores, said first and secod magnetic layers being magnetically connected at first ends thereof and forming a gap between second ends thereof; at least one conductor layer positioned between said first and second magnetic layers, said conductor layer comprising winding means through which current flows during use of the magnetic head; said at least one conductor layer having on each of two opposite sides thereof a separating layer means for separating and electrically isolating said conductor layer from adjacent layers; and said separating layer means on at least one side of said at least one conductor layer including a semiconductor layer.
Claim 3
Dependent Claim
24 words
A thin film magnetic head as claimed in claim 1, wherein said separating layer means including a semiconductor layer further includes an insulator layer.
Claim 4
Dependent Claim
24 words
A thin film magnetic head as claimed in claim 2, wherein said semiconductor layer is positioned between said insulator layer and said conductor layer.
Claim 5
Dependent Claim
58 words
A thin film magnetic head as claimed in claim 2, wherein said insulator layer is positioned between said semicoducor layer and said conductor layer, and said insulator layer has a thickness such as to allow heat generated in said conductor layer during use of the magnetic head to be dissipated through said insulator layer to said semiconductor layer.
Claim 6
Dependent Claim
23 words
A thin film magnetic head as claimed in claim 2, wherein said insulator layer comprises an oxidized surface region of said semiconductor layer.
Claim 7
Dependent Claim
22 words
A thin film magnetic head as claimed in claim 2, wherein said insulator comprises a nitrified surface region of said semiconductor layer.
Claim 8
Dependent Claim
31 words
A thin film magnetic head as claimed in claim 2, wherein said insulator layer comprises an oxidized surface region of said conductor layer on the surface thereof facing said semiconductor layer.
Claim 9
Dependent Claim
38 words
A thin film magnetic head as claimed in claim 2, wherein said semiconductor layer comprises a Si layer, and said insulator layer comprises a Si 3 N 4 layer provided between said Si layer and said conductor layer.
Claim 10
Dependent Claim
31 words
A thin film magnetic head as claimed in claim 1, wherein said separating layer means on both sides of said conductor layer each comprises a semiconductor layer and an insulating layer.
Claim 11
Dependent Claim
36 words
A thin film magnetic head as claimed in claim 9, wherein a first said insulator layer comprises an oxidized surface region of said conductor layer on a first surface thereof facing a first said semiconductor layer.
Claim 12
Dependent Claim
38 words
A thin film magnetic head as claimed in claim 10, wherein a second said insulator layer comprises an oxidized surface region on the surface of a second said semiconductor layer facing a second surface of said conductor layer.
Claim 13
Dependent Claim
37 words
A thin film magnetic head as claimed in claim 10, wherein a second said insulator layer comprises a nitrified surface region on the surface of a second semiconductor layer facing a second surface of said conductor layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |