Patent US756220A successfully refreshed from Google Patents.
Patent US3761641A successfully refreshed from Google Patents.
US3761641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head with demountable face part assembly
Assignee: Ampex Corp
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Filing: 1971-06-25
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Granted: 1973-09-25
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Expires: 1991-06-25
Abstract
Abstract The fabrication of a multi-track magnetic head assembly is disclosed wherein the assembly is initially formed in two distinct parts, a core housing part carrying a plurality of magnetic core elements and associated winding means, and a face part which carries the transducer pole tips and serves as the head-to-tape transducing surface. The union between the face part of the assembly and the core housing is formed by lapping the surfaces to be joined to a fine finish and assembling the parts such that the respective magnetic components engage one another to complete a magnetic circuit extending from the core element to the associated pole tips and thus through the transducing gaps defined thereby. In order to facilitate re-working of the assembly, the face part is secured to the core housing by only a strip of epoxy adhesive occupying a longitudinal groove in the surface of the core housing adjacent the mated surface of the face part. The face part may be removed for replacement by a simple cutting operation which releases the epoxy bond.
Inventors
- 👤 T Mlinaric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/193; G11B5/10; G11B5/133; G11B5/1335; G11B5/29; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49055
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
A magnetic head assembly comprising a core housing carrying a plurality of core members with winding means thereon and separated by a first plurality of magnetic shield members, said core members with winding means and first shield members joined together to form an integral assembly, and a face part carrying a plurality of pairs of magnetic pole pieces with each pair arranged to define a transducing gap with each pair separated by a second plurality of magnetic shield members, said pole pieces and second shield members joined together to form an integral assembly, said face part assembly and core housing assembly having mated planar surfaces at which portions of the core members and first shield members respectively engage registering portions of the pole pieces and second shield members to complete a shielded magnetic circuit extending through each transducing gap, a longitudinal groove formed in at least one of said planar surfaces underlying said transducing gaps, and an adhesive material filling said groove and demountably securing said core housing assembly to said face part assembly solely at the groOve region to allow the face part assembly to be replaced by removing the adhesive material in the groove.
Claim 2
Dependent Claim
196 words
A magnetic head assembly comprising a core housing carrying a plurality of core members with winding means thereon and separated by a first plurality of magnetic shield members, said core members with winding means and first shield members joined together to form an integral assembly, and a face part carrying a plurality of pairs of magnetic pole pieces with each pair arranged to define a transducing gap with each pair separated by a second plurality of magnetic shield members, said pole pieces and second shield members joined together to form an integral assembly, said face part assembly and core housing assembly having mated planar surfaces at which portions of the core members and first shield members respectively engage registering portions of the pole pieces and second shield members to complete a shielded magnetic circuit extending through each transducing gap, a longitudinal groove formed in at least one of said planar surfaces underlying said transducing gaps, and an adhesive material filling said groove and demountably securing said core housing assembly to said face part assembly solely at the groOve region to allow the face part assembly to be replaced by removing the adhesive material in the groove.
Claim 3
Dependent Claim
24 words
The magnetic head assembly of claim 1, further defined by said longitudinal groove being formed in the planar surface of said core housing assembly.
Claim 4
Dependent Claim
22 words
The head assembly as set forth in claim 2, wherein said longitudinal groove is further defined as having a V-shaped cross section.
Claim 5
Dependent Claim
33 words
The head assembly as defined in claim 3, said core members each being V-shaped and disposed in said housing with their troughs aligned so as to outline the location of said V-shaped groove.
Claim 6
Dependent Claim
46 words
The head assembly as defined in claim 4, wherein said V-shaped core members have an angle of the order of 90*, and said coil means comprises a pair of coils for each core member, each coil being wound around one leg of the V-shaped core member.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |