US3764756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head assembly with irregularly shaped aperture structure
Assignee: Potter Instrument Co Inc
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Filing: 1971-10-13
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Granted: 1973-10-09
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Expires: 1991-10-13
Abstract
Abstract In the manufacture of magnetic head assemblies, an irregularly shaped elongated aperture is formed in a nonmagnetic base to receive a magnetic core having a transducing gap. The aperture has a plurality of sidewalls which lie in two parallel planes spaced from each other by the width of the core, at least one portion of the aperture has a width, in a direction normal to the parallel planes, which is greater than the thickness of the core. The core is inserted between the sidewalls in the slot defined thereby, so that its gap is located in a portion of the aperture wider than the core. The remaining vacant portions of the aperture are filled with a transparent sealing composition which bonds the core to the base and permits a view of the mounted core. The base is then machined to reduce the gap to a predetermined critical height as determined by optical measurement.
Inventors
- 👤 J Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/105; G11B5/127; G11B5/187; G11B5/1871; G11B5/48; G11B5/58; G11B5/60; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
85 words
A method of positioning a flat magnetic core with a transducing gap in a base to form a magnetic head assembly, comprising the steps of forming an irregularly shaped elongated aperture through the base having nonfacing parallel sidewalls which define a slot within said aperture with the same width as the core, said aperture being wider than said slot at said nonfacing sidewalls, inserting the core into said slot between said sidewalls, and filling the remaining vacant portions of said aperture with a bonding material.
Claim 2
Independent Claim
85 words
A method of positioning a flat magnetic core with a transducing gap in a base to form a magnetic head assembly, comprising the steps of forming an irregularly shaped elongated aperture through the base having nonfacing parallel sidewalls which define a slot within said aperture with the same width as the core, said aperture being wider than said slot at said nonfacing sidewalls, inserting the core into said slot between said sidewalls, and filling the remaining vacant portions of said aperture with a bonding material.
Claim 3
Dependent Claim
28 words
The method of claim 1, further comprising the step of removing a portion of said base and said core to reduce said transducing gap to an optimum height.
Claim 4
Dependent Claim
48 words
The method of claim 1, wherein said bonding material is transparent, and further comprising the step of removing portions of said base and core until said transducing gap is reduced to a predetermined critical height as determined by optically viewing said transducing gap through said transparent bonding material.
Claim 5
Dependent Claim
12 words
The method of claim 3, wherein said transparent bonding material is glass.
Claim 6
Dependent Claim
49 words
The method of claim 4, wherein the step of filling said vacant portions with glass includes the steps of placing glass in said vacant portions and then heating the assembly to the melting point of the glass so that it flows into sealing contact with the core and base.
Claim 7
Dependent Claim
75 words
The method of claim 3, wherein the slot into which the core is inserted is defined by three sidewalls of the aperture formed in the base, two of the sidewalls being spaced from each other and lying in a first plane, the other sidewall being located between the two coplanar sidewalls and lying in a second plane parallel to the first plane and spaced therefrom by a distance equal to the width of the core.
Claim 8
Independent Claim
145 words
A method of positioning a flat magnetic core with a transducing gap in a base to form a magnetic head assembly, comprising the steps of forming an irregularly shaped aperture through the base having sidewalls lying in two parallel planes spaced from each other by the width of the core and having at least one wider portion in which the width of said aperture in a direction normal to said planes is greater than the width of the core, inserting the core between said sidewalls such that the transducing gap is located in said wider portion of said aperture, filling the remaining vacant portions of said aperture with a transparent bonding material to fix the core in the base, and machining the base until the transducing gap is reduced to a predetermined critical height as determined by viewing the gap through said transparent bonding material.
Claim 9
Independent Claim
145 words
A method of positioning a flat magnetic core with a transducing gap in a base to form a magnetic head assembly, comprising the steps of forming an irregularly shaped aperture through the base having sidewalls lying in two parallel planes spaced from each other by the width of the core and having at least one wider portion in which the width of said aperture in a direction normal to said planes is greater than the width of the core, inserting the core between said sidewalls such that the transducing gap is located in said wider portion of said aperture, filling the remaining vacant portions of said aperture with a transparent bonding material to fix the core in the base, and machining the base until the transducing gap is reduced to a predetermined critical height as determined by viewing the gap through said transparent bonding material.
Claim 10
Dependent Claim
83 words
A magnetic head assembly, comprising a flat magnetic core forming a transducing Gap of critical height, and a base with an irregularly shaped aperture formed therethrough having a plurality of nonfacing sidewalls lying in two parallel planes spaced from each other by a distance equal to the thickness of said core, said aperture being wider than said core at said nonfacing sidewalls, said core being fixed to said base between said sidewalls in the slot defined thereby, with said gap in said slot.
Claim 11
Dependent Claim
83 words
A magnetic head assembly, comprising a flat magnetic core forming a transducing Gap of critical height, and a base with an irregularly shaped aperture formed therethrough having a plurality of nonfacing sidewalls lying in two parallel planes spaced from each other by a distance equal to the thickness of said core, said aperture being wider than said core at said nonfacing sidewalls, said core being fixed to said base between said sidewalls in the slot defined thereby, with said gap in said slot.
Claim 12
Dependent Claim
29 words
The assembly of claim 8, wherein the portions of said aperture not occupied by said core are filled with a bonding material to fix said core to said base.
Claim 13
Dependent Claim
11 words
The assembly of claim 9, wherein said bonding material is transparent.
Claim 14
Dependent Claim
22 words
The assembly of claim 10, wherein said gap is visible through a portion of said aperture filled with said transparent bonding material.
Claim 15
Dependent Claim
12 words
The assembly of claim 10, wherein said transparent bonding material is glass.
Claim 16
Dependent Claim
47 words
The assembly of claim 8, wherein said aperture has two spaced sidewalls in one plane contacting said core at its ends on one side and another sidewall located between the two coplanar sidewalls in the other plane contacting said core at its middle on the other side.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |