Patent US4128248A successfully refreshed from Google Patents.
Patent US4593334A successfully refreshed from Google Patents.
US4593334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film transducer
Assignee: International Business Machines Corp
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Filing: 1983-05-02
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Granted: 1986-06-03
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Expires: 2003-05-02
Abstract
Abstract A film transducer head design is formed on a substrate where the first yoke layer and electric terminal strip that connects the coil center pad to the head exterior are formed at the same time followed by successive layers that form the transducer gap, coil insulation, coil, coil insulation and the second yoke layer. This sequence allows the coil to be tested immediately after deposition of the coil material and at a time in the fabrication sequence when it can be reworked or replaced if a discontinuity (open) or shorted turn(s) is (are) identified.
Inventors
- 👤 Nathaniel C. Anderson
- 👤 Larry E. Daby
- 👤 Gene A. Johnson
- 👤 Patrick M. McCaffrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:26
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3109; G11B5/313; G11B5/3133; G11B5/3163; G11B5/3166
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
202 words
A thin film transducer for recording and reading magnetic transitions on a magnetic recording medium, said transducer comprising: two layers of magnetic material deposited on a substrate and forming a yoke structure comprising a pole tip region and a back gap region; non-magnetic material deposited between said two layers except at a back gap region, said non-magnetic material forming a transducer gap at the pole tip region; a flat conductor coil including a plurality of deposited substantially helical turns, at least respective one portions of which are disposed between the two layers of the yoke structure, with a helical coil terminal end within the helical turns; a conductor member substantially coplanar with the first deposited of said yoke layers and in electrical contact with said helical coil terminal end within the helical turns, extending to a location beyond the periphery of said flat conductor coil and disposed between respective second portions of said flat conductor coil helical turns and said substrate; and insulating material electrically insulating said conductor coil from said yoke structure and said flat conductor coil helical turns from said conductor member; wherein said first deposited of said layers and said conductor member are formed simultaneously of a common material.
Claim 2
Dependent Claim
202 words
A thin film transducer for recording and reading magnetic transitions on a magnetic recording medium, said transducer comprising: two layers of magnetic material deposited on a substrate and forming a yoke structure comprising a pole tip region and a back gap region; non-magnetic material deposited between said two layers except at a back gap region, said non-magnetic material forming a transducer gap at the pole tip region; a flat conductor coil including a plurality of deposited substantially helical turns, at least respective one portions of which are disposed between the two layers of the yoke structure, with a helical coil terminal end within the helical turns; a conductor member substantially coplanar with the first deposited of said yoke layers and in electrical contact with said helical coil terminal end within the helical turns, extending to a location beyond the periphery of said flat conductor coil and disposed between respective second portions of said flat conductor coil helical turns and said substrate; and insulating material electrically insulating said conductor coil from said yoke structure and said flat conductor coil helical turns from said conductor member; wherein said first deposited of said layers and said conductor member are formed simultaneously of a common material.
Claim 3
Dependent Claim
137 words
A thin film transducer head mounted on a substrate which includes a yoke comprising first and second layers extending from a pole tip transducing gap to a back region including a back gap at which at which said yoke layers are in intimate contact; a coil extending through and electrically insulated from said yoke intermediate said transducing gap and said back gap and having an inner terminal end; an electric terminal strip substantially coplanar with said first yoke layer and isolated therefrom; said electric terminal strip electrically connected to said coil inner terminal end, extending between said coil and said substrate to a location beyond the periphery of said coil and electrically insulated from the overlying convolutions of said coil wherein said first yoke layer and said electric terminal strip are formed simutaneously of a common material.
Claim 4
Dependent Claim
137 words
A thin film transducer head mounted on a substrate which includes a yoke comprising first and second layers extending from a pole tip transducing gap to a back region including a back gap at which at which said yoke layers are in intimate contact; a coil extending through and electrically insulated from said yoke intermediate said transducing gap and said back gap and having an inner terminal end; an electric terminal strip substantially coplanar with said first yoke layer and isolated therefrom; said electric terminal strip electrically connected to said coil inner terminal end, extending between said coil and said substrate to a location beyond the periphery of said coil and electrically insulated from the overlying convolutions of said coil wherein said first yoke layer and said electric terminal strip are formed simutaneously of a common material.
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) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |