US4317147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sandwich type magnetoresistive read head
Assignee: International Business Machines Corp
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Filing: 1979-12-20
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Granted: 1982-02-23
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Expires: 1999-12-20
Abstract
Abstract A magnetoresistive head assembly comprises a silicon substrate, a magnetoresistive element mounted on the substrate, and sapphire members formed around said substrate in a sandwich type configuration. The portion of the head which interacts in transducing relation with a magnetic medium is so configured as to realize improved wear characteristics as well as good heat dissipation with low thermal noise.
Inventors
- 👤 Gerald A. Daughenbaugh
- 👤 Philip W. Koob
- 👤 Arthur E. Moxley
- 👤 Joseph E. Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:37
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/187; G11B5/255
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A magnetoresistive head assembly consisting of a silicon substrate having two sides; a magnetoresistive element disposed on one side of said silicon substrate; a first sapphire member bonded to said one side of said silicon substrate and said magnetoresistive element; and a second sapphire member bonded to the other side of said silicon substrate whereby a sandwich configuration is formed so that said assembly realizes improved wear life, improved heat dissipation characteristics and improved ease in manufacture.
Claim 2
Dependent Claim
77 words
A magnetoresistive head assembly consisting of a silicon substrate having two sides; a magnetoresistive element disposed on one side of said silicon substrate; a first sapphire member bonded to said one side of said silicon substrate and said magnetoresistive element; and a second sapphire member bonded to the other side of said silicon substrate whereby a sandwich configuration is formed so that said assembly realizes improved wear life, improved heat dissipation characteristics and improved ease in manufacture.
Claim 3
Dependent Claim
17 words
A magnetoresistive head assembly as in claim 1, wherein said head assembly has a spherical contoured face.
Claim 4
Dependent Claim
29 words
A magnetoresistive head assembly as in claim 2, wherein said magnetoresistive element is located at the centerline defined at the junction of said silicon substrates and first sapphire member.
Claim 5
Dependent Claim
47 words
A magnetoresistive head assembly as in claim 3, wherein the thickness of said silicon substrate r is determined by the relationship r <√2Rh where R is the radius of the head and h is the depth of the magnetoresistive element below the apex of the spherical surface.
Claim 6
Dependent Claim
36 words
A magnetoresistive head assembly as in claim 3, wherein the distance from said magnetoresistive element measured along a line perpendicular to said centerline to said spherical face is greater than the thickness of said silicon substrate.
Claim 7
Dependent Claim
16 words
A magnetoresistive head assembly as in claim 1, including a capacitor wired to said magnetoresistive element.
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) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |