Patent US3577191A successfully refreshed from Google Patents.
US3577191A
Expired / Lapsed
US
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Magnetic head assembly with sidebar
Assignee: International Business Machines Corp
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Filing: 1968-08-05
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Granted: 1971-05-04
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Expires: 1988-08-05
Abstract
Abstract A magnetic head assembly, useful for noncontact magnetic recording, is formed to provide an inner cavity, wherein a thin magnetic core is fixed against a cavity wall. A magnetic sidebar, to which electrical coils are mounted, is secured adjacent to the core to complete the magnetic circuit.
Inventors
- 👤 Eduard E Haertlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:46
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
A magnetic head assembly comprising: a nonmagnetic housing having a cavity formed therein, said cavity having two opposing walls; a U-shaped magnetic core including two L-shaped portions with a nonmagnetic gap disposed between the ends of the facing base portions of each L: said magnetic core having one of its U-shaped faces bonded to and supported by one of said walls for accurately positioning said core in said cavity; a magnetic sidebar positioned against and abutting the other Ushaped face of said core disposed away from said nonmagnetic gap for closing a magnetic circuit through said U-shaped magnetic core and said magnetic sidebar; and resilient means for securing said sidebar against said other ushaped face of said core.
Claim 2
Dependent Claim
118 words
A magnetic head assembly comprising: a nonmagnetic housing having a cavity formed therein, said cavity having two opposing walls; a U-shaped magnetic core including two L-shaped portions with a nonmagnetic gap disposed between the ends of the facing base portions of each L: said magnetic core having one of its U-shaped faces bonded to and supported by one of said walls for accurately positioning said core in said cavity; a magnetic sidebar positioned against and abutting the other Ushaped face of said core disposed away from said nonmagnetic gap for closing a magnetic circuit through said U-shaped magnetic core and said magnetic sidebar; and resilient means for securing said sidebar against said other ushaped face of said core.
Claim 3
Dependent Claim
15 words
A magnetic head assembly as in claim 1, including electrical coils coupled to said sidebar.
Claim 4
Dependent Claim
30 words
A magnetic head assembly as in claim 1, wherein said bonding material has a coefficient of thermal expansion substantially the same as that of said core and said nonmagnetic housing.
Claim 5
Dependent Claim
14 words
A magnetic head assembly as in claim 1, wherein said bonding material is glass.
Claim 6
Dependent Claim
31 words
A magnetic head assembly as in claim 1, wherein said nonmagnetic housing has an air bearing surface at which the nonmagnetic gap is disposed, for transducing relation with a magnetic medium.
Claim 7
Dependent Claim
55 words
The magnetic head assembly set forth in claim 1, wherein said resilient means wedgingly extend between the other of said opposing walls of said cavity and said other U-shaped face of said core and against said magnetic sidebar for holding said sidebar against said core and for maintaining said core fixedly against said cavity wall.
Claim 8
Dependent Claim
22 words
A magnetic head assembly as in claim 6, including recesses formed at the ends of said sidebar for accommodating said resilient means.
Claim 9
Dependent Claim
15 words
A magnetic head assembly as in claim 6, wherein said resilient means comprise elastomeric clamps.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |