US4100584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer head with narrow core structure
Assignee: Unisys Corp
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Filing: 1977-09-26
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Granted: 1978-07-11
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Expires: 1997-09-26
Abstract
Abstract In the manufacture of a transducer head, a plurality of elongated slots are formed in a non-magnetic substrate to receive magnetic cores having a transducing gap. A sealing composition bonds the cores in the slots and the cores are then laser trimmed to predetermined widths and at predetermined core-to-core spacings.
Inventors
- 👤 Michael Isaac Behr
- 👤 KoKo Gyi
- 👤 Werner Brutsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49048
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
143 words
A multiple magnetic head comprising: a non-magnetic base having a plurality of elongated apertures formed therethrough, said apertures extending in parallel and having center lines spaced equidistantly from each other; and a ferrite magnetic core member bonded in each one of said apertures and each including a core gap of 100μ inches or less extending in a plane normal to the center line of the apertures, said cores each having laser trepanned surface regions on both sides of the gap forming parallel slots, across said core gap, said slots being spaced apart to define a narrow core portion therebetween having an effective core width within the range of 0.5 mil-slots having a length greater than the length of said core gap and said slots having a long axis extending in parallelism with the center lines of said apertures and having skewed longitudinal ends.
Claim 2
Dependent Claim
143 words
A multiple magnetic head comprising: a non-magnetic base having a plurality of elongated apertures formed therethrough, said apertures extending in parallel and having center lines spaced equidistantly from each other; and a ferrite magnetic core member bonded in each one of said apertures and each including a core gap of 100μ inches or less extending in a plane normal to the center line of the apertures, said cores each having laser trepanned surface regions on both sides of the gap forming parallel slots, across said core gap, said slots being spaced apart to define a narrow core portion therebetween having an effective core width within the range of 0.5 mil-slots having a length greater than the length of said core gap and said slots having a long axis extending in parallelism with the center lines of said apertures and having skewed longitudinal ends.
Claim 3
Dependent Claim
17 words
The magnetic head of claim 1, wherein said skewed ends are oriented at an angle of 45°.
Claim 4
Dependent Claim
16 words
The magnetic head of claim 2, wherein said base is made of an electrically non-conductive material.
Claim 5
Dependent Claim
20 words
The magnetic head of claim 2, wherein said core is made of a ferrite material of the formula NiZnoFe 203.
Claim 6
Dependent Claim
23 words
The magnetic head of claim 2, wherein said core has an U-shaped configuration, the base of the U defining said laser trepanned portion.
Claim 7
Dependent Claim
13 words
The magnetic head of claim 2, wherein said bonding agent is an epoxy.
Claim 8
Dependent Claim
14 words
The magnetic head of claim 2, wherein said bonding agent is a glass sealant.
Claim 9
Dependent Claim
21 words
The magnetic head of claim 2, wherein said aperture is elongated, having a width greater than the width of said core.
Claim 10
Dependent Claim
13 words
The magnetic head of claim 2, wherein said aperture has a rectangular configuration.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |