US4685012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head with anisotropy in plane of core ports
Assignee: US Philips Corp
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Filing: 1985-10-30
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Granted: 1987-08-04
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Expires: 2005-10-30
Abstract
Abstract A magnetic head having a core of a magnetizable material around a part of which a coil is provided. A transducing gap is formed between two core parts of a magnetically anisotropic, amorphous ferromagnetic metal. The core parts of a magnetically anisotropic, amorphous ferromagnetic material have a magnetic anisotropy direction induced by a thermal treatment in a magnetic field which is in the plane of the core parts and encloses an angle α with the direction in which magnetic flux traverses the core parts during operation. α preferably is equial to 90°. By these means an increased permeability in the MHz range is reached in combination with a minimum loss component.
Inventors
- 👤 Hendrik J. De Wit
- 👤 Marcel Brouha
- 👤 Ulrich E. Enz
- 👤 Kornelis Jager
- 👤 Albertus J. C. Van Der Borst
- 👤 Gijsbertus W. Turk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3176; G11B5/3179; G11B5/147; G11B5/187; G11B5/21
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A magnetic head having a core of a magnetizable material around a part of which a coil is provided, and comprising two laminar core parts of an amorphous ferromagnetic metal, said parts being coplanar and defining a transducing gap therebetween, characterized in that the core parts are of a magnetically anisotropic, amorphous ferromagnetic metal and have a magnetic anisotropy direction which is in the plane of the core parts and encloses an angle α with the direction in which magnetic flux traverses the core parts during operation, where 45°≦α≦90°.
Claim 2
Dependent Claim
89 words
A magnetic head having a core of a magnetizable material around a part of which a coil is provided, and comprising two laminar core parts of an amorphous ferromagnetic metal, said parts being coplanar and defining a transducing gap therebetween, characterized in that the core parts are of a magnetically anisotropic, amorphous ferromagnetic metal and have a magnetic anisotropy direction which is in the plane of the core parts and encloses an angle α with the direction in which magnetic flux traverses the core parts during operation, where 45°≦α≦90°.
Claim 3
Dependent Claim
12 words
A magnetic head as claimed in claim 1, characterized in that α=90°.
Claim 4
Dependent Claim
24 words
A magnetic head as claimed in claim 1, characterized in that the core parts consist of an iron, cobalt, boron and silicon-containing amorphous alloy.
Claim 5
Dependent Claim
24 words
A magnetic head as claimed in claim 2, characterized in that the core parts consist of an iron, cobalt, boron and silicon-containing amorphous alloy.
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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |