US4356524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head
Assignee: Olympus Corp
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Filing: 1980-06-16
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Granted: 1982-10-26
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Expires: 2000-06-16
Abstract
Abstract A magnetic head comprises a core holder for holding a magnetic head element and including a first conductive region which is adapted to bear against the magnetic head element, and a shielding case which defines a second conductive region adapted to bear against the first conductive region and covering both the magnetic head element and the core holder to provide a magnetic shielding. In this manner, any static electricity developed on a magnetic tape is conducted to the ground potential of an instrument in which the magnetic head is mounted through the first and the second conductive region.
Inventors
- 👤 Seizo Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/11
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A magnetic head, comprising: a magnetic head element including a core having a magnetic gap defined therein and a coil disposed on the core, the gap serving a record/playback or erasure operation; a core holder for holding the magnetic head element, the core holder including a first conductive region which is integrally formed with and encloses a non-conductive member and which is adapted to bear against the magnetic head element; and a shielding case defining a second conductive region which bears against said first conductive region, the case covering the magnetic head element and the core holder to provide magnetic shielding; the arrangement being such that as the magnetic head element is engaged by a magnetic tape which has a conductive area, any static electricity developed on the magnetic tape is discharged through the first and the second conductive regions.
Claim 2
Dependent Claim
140 words
A magnetic head, comprising: a magnetic head element including a core having a magnetic gap defined therein and a coil disposed on the core, the gap serving a record/playback or erasure operation; a core holder for holding the magnetic head element, the core holder including a first conductive region which is integrally formed with and encloses a non-conductive member and which is adapted to bear against the magnetic head element; and a shielding case defining a second conductive region which bears against said first conductive region, the case covering the magnetic head element and the core holder to provide magnetic shielding; the arrangement being such that as the magnetic head element is engaged by a magnetic tape which has a conductive area, any static electricity developed on the magnetic tape is discharged through the first and the second conductive regions.
Claim 3
Dependent Claim
32 words
A magnetic head according to claim 1 in which the first conductive region is formed on the total surface of the core holder by electroless plating or spraying of a conductive paint.
Claim 4
Dependent Claim
16 words
A magnetic head according to claim 1 in which the shielding case comprises a conductive member.
Claim 5
Dependent Claim
37 words
A magnetic head according to claim 1, further including a first conductive leaf spring disposed between the magnetic head element and the core holder to bear against the both elements resiliently to provide an electrical interconnection therebetween.
Claim 6
Dependent Claim
36 words
A magnetic head according to claim 1, further including a second conductive leaf spring disposed between the core holder and the shielding case to bear against the both elements resiliently to provide an electrical interconnection therebetween.
Claim 7
Dependent Claim
120 words
A magnetic head, comprising: a magnetic head element including a core having a coil disposed thereon; a core holder for holding the magnetic head element; said core holder including a first conductive member in contact with said magnetic head element and said first conductive member encloses an internal body portion formed of non-conductive material; a second conductive member in contact with said first conductive member, said second conductive member providing a magnetic shield for said magnetic head element and said core holder, so that when the magnetic head element is engaged by a magnetic tape which has a conductive area, any static electricity developed on said magnetic tape is discharged through said first conductive member and said second conductive member.
Claim 8
Dependent Claim
120 words
A magnetic head, comprising: a magnetic head element including a core having a coil disposed thereon; a core holder for holding the magnetic head element; said core holder including a first conductive member in contact with said magnetic head element and said first conductive member encloses an internal body portion formed of non-conductive material; a second conductive member in contact with said first conductive member, said second conductive member providing a magnetic shield for said magnetic head element and said core holder, so that when the magnetic head element is engaged by a magnetic tape which has a conductive area, any static electricity developed on said magnetic tape is discharged through said first conductive member and said second conductive member.
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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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |