US4170788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head
Assignee: Pioneer Corp
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Filing: 1977-10-04
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Granted: 1979-10-09
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Expires: 1997-10-04
Abstract
Abstract A magnetic head for tape recorders and the like is manufactured with cores made of alloys of elements such as Al and Fe which have relatively large potential differences. In order to avoid the galvanic effect which may be produced by segregation and impurities in the alloys, a part of the tape sliding surface is made of an element such as Zn which is lower in galvanic potential than elements forming the cores, and that part of the tape sliding surface is made electrically conductive to the cores.
Inventors
- 👤 Komei Hashimoto
- 👤 Masahiro Komatsubara
- 👤 Shinji Yasuda
- 👤 Yutaka Masumoto
- 👤 Kazuhiko Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:01
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/147; G11B5/10; G11B5/187; G11B5/21; G11B5/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A magnetic head for a magnetic recording and reproducing instrument, such as a tape recorder, said head being of the type having a sliding surface including a magnetic core defining a gap, a shield plate, a core holder and a gap spacer, the improvement comprising at least one of said core holder and gap spacer being constructed of a material having a lower galvanic potential than the elements forming said magnetic core and said shield plate, and means electrically interconnecting said at least one of said core holder and gap spacer with said magnetic core and said shield plate.
Claim 2
Dependent Claim
99 words
A magnetic head for a magnetic recording and reproducing instrument, such as a tape recorder, said head being of the type having a sliding surface including a magnetic core defining a gap, a shield plate, a core holder and a gap spacer, the improvement comprising at least one of said core holder and gap spacer being constructed of a material having a lower galvanic potential than the elements forming said magnetic core and said shield plate, and means electrically interconnecting said at least one of said core holder and gap spacer with said magnetic core and said shield plate.
Claim 3
Dependent Claim
91 words
A magnetic head as claimed in claim 1 wherein said means electrically interconnecting is electrically conductive paint on the inside surface of the sliding surface of said magnetic head, said conductive paint including at least one part covering a part of said core and a part of said core holder, at least a second part covering a part of said shield plate and a part of said core holder and wherein said housing is formed of a material having a lower galvanic order than said magnetic core and said shield plate.
Claim 4
Dependent Claim
52 words
A magnetic head as claimed in claim 2 wherein said gap sapcer is formed of a material having a lower galvanic order than said magnetic core, and wherein said conductive paint further includes at least a third part covering a part of said gap spacer and a part of said magnetic core.
Claim 5
Dependent Claim
25 words
A magnetic head as claimed in claim 1 wherein said core holder has a lower galvanic order than said magnetic core and said shield plate.
Claim 6
Dependent Claim
25 words
A magnetic head as claimed in claim 1 wherein said gap spacer has a lower galvanic order than said magnetic core and said shield plate.
Claim 7
Dependent Claim
19 words
A magnetic head as claimed in claim 1 wherein said magnetic core and shield plate are made of Sendust.
Claim 8
Dependent Claim
19 words
A magnetic head as claimed in claim 1, wherein said magnetic core and shield plate are made of Alperm.
References Cited (Backward Citations)
US2928907A
Cited
US3578920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |