US4489357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sensor having multilayered flux conductors
Assignee: US Philips Corp
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Filing: 1982-04-23
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Granted: 1984-12-18
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Expires: 2002-04-23
Abstract
Abstract A magnetic sensor (1) includes a magneto-resistive element (3) which magnetically bridges a gap (15) between two magnetic flux conductors (6,7). In order to reduce the noise level and higher harmonic distortion of the sensor, each of the flux conductors (6,7) includes at least two layers (16,18) of magnetically permeable materials having substantially the same composition between which a layer (17) is present which has a different composition.
Inventors
- 👤 Johannes A. C. Van Ooijen
- 👤 Robertus D. J. Verhaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3916; G11B5/3919; G11B5/3922; G11B5/3925; H; H10; H10N; H10N50/00; H10N50/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A magnetic sensor, comprising: an elongate and generally flat magneto-resistance element which has a magnetic anisotropy in which the easy axis of magnetization lies in the major plane of the element; two magnetically permeable components situated in one plane between which components a gap is present, the gap being bridged magnetically by the magneto-resistance element; a body of a magnetically permeable material disposed parallel to the two components, the body having one end coupled magnetically to an end of a first of the two components remote from the gap, an end of the second magnetically permeable component remote from the gap being adapted to be brought in a flux coupling relationship with an external magnetic field, characterized in that each magnetically permeable component includes at least two parallel layers of magnetically permeable materials each having substantially a first composition, and that an intermediate layer having a composition different from the first composition is present between the two parallel layers.
Claim 2
Dependent Claim
159 words
A magnetic sensor, comprising: an elongate and generally flat magneto-resistance element which has a magnetic anisotropy in which the easy axis of magnetization lies in the major plane of the element; two magnetically permeable components situated in one plane between which components a gap is present, the gap being bridged magnetically by the magneto-resistance element; a body of a magnetically permeable material disposed parallel to the two components, the body having one end coupled magnetically to an end of a first of the two components remote from the gap, an end of the second magnetically permeable component remote from the gap being adapted to be brought in a flux coupling relationship with an external magnetic field, characterized in that each magnetically permeable component includes at least two parallel layers of magnetically permeable materials each having substantially a first composition, and that an intermediate layer having a composition different from the first composition is present between the two parallel layers.
Claim 3
Dependent Claim
21 words
A sensor as claimed in claim 1, characterized in that the intermediate layer has a thickness not greater than 10 nm.
Claim 4
Dependent Claim
21 words
A sensor as claimed in claim 1 or 2, characterized in that the intermediate layer is formed of a non-magnetic material.
Claim 5
Dependent Claim
19 words
A sensor as claimed in claim 3, characterized in that the intermediate layer of non-magnetic material consists of Mo.
Claim 6
Dependent Claim
45 words
A sensor as claimed in claim 1 or 2, characterized in that the two parallel layers of magnetically permeable materials consist of a Ni--Fe alloy having a first Ni/Fe ratio, and that the intermediate layer consists of a Ni--Fe alloy having a second Ni/Fe ratio.
References Cited (Backward Citations)
US3921217A
Cited
JPS529413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |