US4434445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head for high track density
Assignee: US Philips Corp
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Filing: 1981-11-02
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Granted: 1984-02-28
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Expires: 2001-11-02
Abstract
Abstract A magnetic head for writing and/or reading information in mutually parallel tracks of a magnetic recording medium includes a transducing gap having a depth of the same order of magnitude as the longest wavelength on the recording medium. The gap also has a slope of less than or equal to 45° relative to the head surface which faces the medium.
Inventors
- 👤 Alfred van Herk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:21
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; G11B5/187; G11B5/23; G11B5/48; G11B5/488
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
A magnetic head (31) for writing and/or reading information in parallel tracks on a magnetic recording medium (32) with high track density, comprising a magnetic core which includes two oppositely located parts (38, 39) enclosing a transducing gap (34) between them, around which core an electric winding (35) is provided, the head (31) further comprising means for reducing side fringing effects, characterized in that the reducing means includes the gap having a depth d which is of the order of magnitude of the longest wavelength on the recording medium (32), and also having a slope α oriented relative to the surface (33) facing the recording medium (32) such that α≦45°.
Claim 2
Dependent Claim
110 words
A magnetic head (31) for writing and/or reading information in parallel tracks on a magnetic recording medium (32) with high track density, comprising a magnetic core which includes two oppositely located parts (38, 39) enclosing a transducing gap (34) between them, around which core an electric winding (35) is provided, the head (31) further comprising means for reducing side fringing effects, characterized in that the reducing means includes the gap having a depth d which is of the order of magnitude of the longest wavelength on the recording medium (32), and also having a slope α oriented relative to the surface (33) facing the recording medium (32) such that α≦45°.
Claim 3
Dependent Claim
20 words
A multitrack magnetic head unit, comprising a plurality of juxtaposed magnetic heads of the type as claimed in claim 1.
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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |