US4396967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multielement magnetic head assembly
Assignee: International Business Machines Corp
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Filing: 1981-04-13
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Granted: 1983-08-02
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Expires: 2001-04-13
Abstract
Abstract A multielement magnetic head is formed with a closure section having a nonmagnetic ceramic substrate on which a thin layer of magnetic ferrite is deposited and processed. The thin ferrite layer is cut to define the separate transducing elements and data track separation. The closure section is joined to a wafer formed from a ferrite substrate and a thin film conductive coil means.
Inventors
- 👤 Armando J. Argumedo
- 👤 William W. Chow
- 👤 Lowell E. Dunn
- 👤 Billy R. Lakey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:31
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B5/29; G11B5/295; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49043; Y10T29/49048; Y10T29/49055; Y10T29/4906; Y10T29/49064
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
162 words
A multielement magnetic head assembly comprising a closure member including a hard ceramic substrate, two thin layers of ferrite material of substantially identical thickness adhered to one face of said substrate and separated by a space, one of said layers has a plurality of slots in a direction normal to said face of the substrate to form a plurality of substantially identical uniformly spaced thin ferrite elements, the other layer being devoid of such slots, a wafer including a ferrite substrate, a thin spacing layer of dielectric material adhered to one face of the ferrite substrate, a plurality of conductive coils deposited flatwise on the spacing layer, and electrical leads assoicated with each coil, said closure member and wafer being joined such that a respective one of the coils is disposed adjacent a corresponding one of the ferrite elements, and said space provides an exit path for the leads, said other layer serving as a spacer to maintain parallelism between said substrates.
Claim 2
Dependent Claim
162 words
A multielement magnetic head assembly comprising a closure member including a hard ceramic substrate, two thin layers of ferrite material of substantially identical thickness adhered to one face of said substrate and separated by a space, one of said layers has a plurality of slots in a direction normal to said face of the substrate to form a plurality of substantially identical uniformly spaced thin ferrite elements, the other layer being devoid of such slots, a wafer including a ferrite substrate, a thin spacing layer of dielectric material adhered to one face of the ferrite substrate, a plurality of conductive coils deposited flatwise on the spacing layer, and electrical leads assoicated with each coil, said closure member and wafer being joined such that a respective one of the coils is disposed adjacent a corresponding one of the ferrite elements, and said space provides an exit path for the leads, said other layer serving as a spacer to maintain parallelism between said substrates.
Claim 3
Dependent Claim
18 words
A multielement magnetic head assembly as in claim 1, wherein said ceramic substrate is made of barium titanate.
Claim 4
Dependent Claim
20 words
A multielement magnetic head assembly as in claim 1, wherein said ferrite elements are separated by glass filling the slots.
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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |