Patent US4176384A successfully refreshed from Google Patents.
US4176384A
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Magnetic recording head assembly defining precision gaps
Assignee: Yang Electromagnetic Systems Inc
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Filing: 1978-05-15
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Granted: 1979-11-27
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Expires: 1998-05-15
Abstract
Abstract A magnetic head assembly includes read/write pole elements having tip structure flush with slide surfaces on separate mounts, the latter mounting erase poles having ends at opposite sides of the read/write pole tip structure. Separate coils may be located about the erase poles; and notches may be located in the mounts at opposite sides of the read/write pole elements to provide a controlled throat dimension.
Inventors
- 👤 Charles S. Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:46
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/1871; G11B5/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
In a unitary magnetic head assembly, the combination comprising (a) read/write poles having opposite sides defining upright, parallel vertical planes, said poles having tips, (b) two ceramic blocks respectively abutting said opposite sides and being in mutual registration, the blocks having local recesses therein extending laterally away from said upright opposite sides and the blocks having upright inner surfaces adjacent said recesses and respectively facing laterally toward said opposite sides, (c) and two erase poles respectively carried by said blocks, said erase poles having inner surfaces flush with the respective block inner surfaces thereby to define gaps between the erase pole inner surfaces and the read/write pole opposite sides, whereby the gap widths are defined by the widths of the recesses in the blocks, (d) the blocks having bottom slide surfaces, the erase poles having ends flush with said slide surfaces, and the read/write poles having tips flush with said slide surfaces.
Claim 2
Dependent Claim
152 words
In a unitary magnetic head assembly, the combination comprising (a) read/write poles having opposite sides defining upright, parallel vertical planes, said poles having tips, (b) two ceramic blocks respectively abutting said opposite sides and being in mutual registration, the blocks having local recesses therein extending laterally away from said upright opposite sides and the blocks having upright inner surfaces adjacent said recesses and respectively facing laterally toward said opposite sides, (c) and two erase poles respectively carried by said blocks, said erase poles having inner surfaces flush with the respective block inner surfaces thereby to define gaps between the erase pole inner surfaces and the read/write pole opposite sides, whereby the gap widths are defined by the widths of the recesses in the blocks, (d) the blocks having bottom slide surfaces, the erase poles having ends flush with said slide surfaces, and the read/write poles having tips flush with said slide surfaces.
Claim 3
Dependent Claim
11 words
The combination of claim 1 including fused glass filling said gaps.
Claim 4
Dependent Claim
34 words
The combination of claim 2 wherein the blocks have notches therein directly above said recesses and extending away from said read/write poles to greater extent then the recesses, and fused glass filling said notches.
Claim 5
Dependent Claim
26 words
The combination of claim 1 wherein the erase poles have free ends projecting above the levels of said blocks, and separate coils about said erase poles.
Claim 6
Dependent Claim
13 words
The combination of claim 1 wherein said erase pole ends have parallelogram shapes.
Claim 7
Dependent Claim
28 words
The combination of claim 1 including a housing having an end opening, said blocks located in said opening, and plastic material about said opening and embedding said blocks.
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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |