US4953050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head with Ru containing soft magnetic alloy in gap
Assignee: Sony Corp
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Filing: 1990-01-10
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Granted: 1990-08-28
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Expires: 2010-01-10
Abstract
Abstract A magnetic head is disclosed which is formed by magnetic core halves constituted of an oxide magnetic material and soft magnetic thin films, wherein the boundary surfaces between the thin films and the oxide magnetic material runs substantially parallel to the gap surface in the vicinity of the magnetic gap. The soft magnetic thin films are soft magnetic thin films of the Fe-Ga-Si system consisting essentially of Fe, Ga and Si.
Inventors
- 👤 Tatsuo Kumura
- 👤 Heikichi Sato
- 👤 Yoshiyuki Kunito
- 👤 Yoshito Ikeda
- 👤 Etsuo Izu
- 👤 Masatoshi Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:20
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
A magnetic head in which a pair of magnetic core halves are abutted to each other, at least one of said core halves being formed by an oxide magnetic core portion and a soft magnetic alloy thin film portion provided on said oxide magnetic core portion, said soft magnetic alloy thin film portion being formed of a first film portion formed of an Fe-GA-Si system alloy containing a certain amount of Ru, and provided adjacent to said oxide magnetic core portion, and a second film portion formed of a soft magnetic alloy having different composition from said first film portion and facing to another magnetic core half to define a magnetic gap therebetween, the boundary surface between the Fe-Ga-Si system soft magnetic thin film and said oxide magnetic core portion being substantially parallel to a gap surface in the vicinity of the magnetic gap.
Claim 2
Dependent Claim
144 words
A magnetic head in which a pair of magnetic core halves are abutted to each other, at least one of said core halves being formed by an oxide magnetic core portion and a soft magnetic alloy thin film portion provided on said oxide magnetic core portion, said soft magnetic alloy thin film portion being formed of a first film portion formed of an Fe-GA-Si system alloy containing a certain amount of Ru, and provided adjacent to said oxide magnetic core portion, and a second film portion formed of a soft magnetic alloy having different composition from said first film portion and facing to another magnetic core half to define a magnetic gap therebetween, the boundary surface between the Fe-Ga-Si system soft magnetic thin film and said oxide magnetic core portion being substantially parallel to a gap surface in the vicinity of the magnetic gap.
Claim 3
Dependent Claim
28 words
A magnetic head according to claim 1, said second film portion being formed of an Fe-GA-Si system alloy containing a lesser amount of Ru than said certain amount.
References Cited (Backward Citations)
US4581080A
Cited
JPS58105422A
Cited
US4755899A
Cited
EP0149281A2
Cited
US4710243A
Cited
JPS61234509A
Cited
EP0198422A2
Cited
JPS6278805A
Cited
JPS6289312A
Cited
JPS62104108A
Cited
JPS62104105A
Cited
US4787004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |