US4192985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of integrated magnetic head structures
Assignee: Siemens AG
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Filing: 1977-09-15
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Granted: 1980-03-11
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Expires: 1997-09-15
Abstract
Abstract A method for a definitive fixing of the breadth of magnetic layers in the vicinity of the end face of a recording carrier, which breadth determines the track breadth, in which an integrated magnetic head structure is carried on a substrate and has a large number of thin magnetic, non-magnetic, insulating and electrically conductive layers stacked one upon an another, and in which originally broader magnetic layers are partially worn down by ion bombardment, the zones not to be worn down being first covered with a mask. Ion bombardment is carried out at right angles to the thin layers, i.e. at right angles to the plane of the substrate, with the mask suitably disposed.
Inventors
- 👤 Winfried Berghof
- 👤 Alfred Pichler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:14
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/14; G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3163; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048; Y10T29/49052
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
In a process of producing a magnetic head structure in which a magnetic pole piece of alternate magnetic and non-magnetic layers has an end face milled by ion bombardment at right angles to the face, from an original breadth to a smaller breadth which determines the track breadth, the improvement for definitive fixing of the smaller breadth comprising the steps of: masking the head structure perpendicular to the end face and parallel to the planes of the layers to expose areas to be removed; and bombarding the exposed areas through the mask at right angles to the planes of the layers.
Claim 2
Dependent Claim
101 words
In a process of producing a magnetic head structure in which a magnetic pole piece of alternate magnetic and non-magnetic layers has an end face milled by ion bombardment at right angles to the face, from an original breadth to a smaller breadth which determines the track breadth, the improvement for definitive fixing of the smaller breadth comprising the steps of: masking the head structure perpendicular to the end face and parallel to the planes of the layers to expose areas to be removed; and bombarding the exposed areas through the mask at right angles to the planes of the layers.
Claim 3
Dependent Claim
60 words
The improved process of claim 1, wherein the step of masking is defined as coating the entire magnetic head structure, with the exception of the areas to be removed, with a titanium coating, and the step of bombarding the exposed areas is further defined as bombarding the coated head with ions to remove the magnetic material in the exposed areas.
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) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |