Patent US4361860A successfully refreshed from Google Patents.
US4361860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer head and method of manufacturing the same
Assignee: Sony Corp
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Filing: 1980-02-25
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Granted: 1982-11-30
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Expires: 2000-02-25
Abstract
Abstract A magnetic transducer head employing magnetic alloys as a core material and a method of manufacturing the same are disclosed. A pair of core blocks made of magnetic alloys are bonded together by a glass to form an effective gap therebetween. A thin metal layer is formed on the surface of the core blocks which results in a transition layer of the metal accompanied with oxide of the metal between the core block and the glass upon heat treatment for glass bonding to strengthen the bonding.
Inventors
- 👤 Kazuo Nozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:02
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
167 words
A magnetic transducer head comprising a pair of core blocks made of magnetic alloy, an effective magnetic gap between said core blocks, glass bonding said core blocks together and a winding around at least one of said core blocks, a transition layer of a metal accompanied with an oxide of said metal between the surfaces of both of said pair of core blocks and said glass, and further comprising a pair of grooves formed at one end of said gap in the direction of a track width extending along the depth of said gap, said grooves being filled with said glass and said transition layer of metal formed on the surfaces of said grooves so as to be between said glass and both of said pair of core blocks and wherein said transition layer of metal is selected from the group consisting of Cu, Mo, T, and W and said glass containing PbO, B 2 O 3 , ZnO, Al 2 O 3 and SiO 2 .
Claim 2
Dependent Claim
167 words
A magnetic transducer head comprising a pair of core blocks made of magnetic alloy, an effective magnetic gap between said core blocks, glass bonding said core blocks together and a winding around at least one of said core blocks, a transition layer of a metal accompanied with an oxide of said metal between the surfaces of both of said pair of core blocks and said glass, and further comprising a pair of grooves formed at one end of said gap in the direction of a track width extending along the depth of said gap, said grooves being filled with said glass and said transition layer of metal formed on the surfaces of said grooves so as to be between said glass and both of said pair of core blocks and wherein said transition layer of metal is selected from the group consisting of Cu, Mo, T, and W and said glass containing PbO, B 2 O 3 , ZnO, Al 2 O 3 and SiO 2 .
Claim 3
Dependent Claim
12 words
A magnetic transducer according to claim 1 wherein said glass contains CuO.
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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |