Patent US5142768A successfully refreshed from Google Patents.
US5142768A
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Method for making magnetic head with enhanced poletip
Assignee: International Business Machines Corp
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Filing: 1991-05-02
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Granted: 1992-09-01
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Expires: 2011-05-02
Abstract
Abstract An interleaved bi-directional magentic tape head for contact recording can have a poletip enhanced by providing a thin film of a soft magnetic material deposited onto a magnetic ferrite substrate. The second pole piece is a thin film of the soft magnetic material. A closure block of a non-magnetic ceramic encloses the layers together with leveling insulation layers and a deposited activating conductor turns. The stripe poletip deposited onto the magnetic ferrite extends for a distance just short of the first conductor turn and provides a balancing of the saturation moment of the pole pieces and provides for better recording capability, especially when operating in a trailing magnetic ferrite mode.
Inventors
- 👤 Joseph A. Aboaf
- 👤 Edward V. Denison
- 👤 Vincent N. Kahwaty
- 👤 Gerald Steving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3103; G11B5/3106; G11B5/3109; G11B5/313; G11B5/3143; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/49043; Y10T29/49044
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
A method of making a magnetic head comprising the steps of: obtaining a substrate of a magnetic ferrite; depositing a stripe of a magnetic material adjacent an edge of the obtained substrate to form at least a portion of a first pole piece; depositing a gap producing insulating material over the deposited stripe and the substrate to form a magnetic gap layer; depositing an electrically conductive material on the deposited insulating material to form conductor turns for the magnetic head, the first turn starting immediately adjacent the stripe as covered by the gap insulating material; depositing an insulating material over the deposited conductive material forming the conductor turns; depositing a magnetic material over the deposited gap producing insulating material and the conductor insulating material to form a second pole piece; depositing a support insulating layer material over the deposited magnetic material adjacent a portion of the second pole piece; depositing a leveling layer of insulating material over the deposited support insulating layer and the remaining portion of the deposited second pole piece material; and bonding a closure block of non-magnetic ceramic material to the deposited leveling layer.
Claim 2
Independent Claim
187 words
A method of making a magnetic head comprising the steps of: obtaining a substrate of a magnetic ferrite; depositing a stripe of a magnetic material adjacent an edge of the obtained substrate to form at least a portion of a first pole piece; depositing a gap producing insulating material over the deposited stripe and the substrate to form a magnetic gap layer; depositing an electrically conductive material on the deposited insulating material to form conductor turns for the magnetic head, the first turn starting immediately adjacent the stripe as covered by the gap insulating material; depositing an insulating material over the deposited conductive material forming the conductor turns; depositing a magnetic material over the deposited gap producing insulating material and the conductor insulating material to form a second pole piece; depositing a support insulating layer material over the deposited magnetic material adjacent a portion of the second pole piece; depositing a leveling layer of insulating material over the deposited support insulating layer and the remaining portion of the deposited second pole piece material; and bonding a closure block of non-magnetic ceramic material to the deposited leveling layer.
Claim 3
Dependent Claim
25 words
A method as defined in claim 1 further including, after the step of obtaining a substrate, the step of depositing an undercoat layer of alumina.
Claim 4
Dependent Claim
34 words
A method as defined in claim 1 wherein the step of depositing a stripe of magnetic material, deposits a stripe having a width of approximately 12 micrometers and a thickness of approximately 5000 Angstroms.
Claim 5
Dependent Claim
24 words
A method as defined in claim 1 wherein the distance between the stripe of magnetic material and the first turn is approximately 2 micrometers.
Claim 6
Dependent Claim
25 words
A method as defined in claim 1 further comprising the step of depositing an undercoat layer between the substrate and the stripe of magnetic material.
References Cited (Backward Citations)
US5016341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |