US4625562A
Expired / Lapsed
US
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Amorphous magnetic alloy sensor
Assignee: Panasonic Holdings Corp
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Filing: 1984-11-01
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Granted: 1986-12-02
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Expires: 2004-11-01
Abstract
Abstract A stress or strain sensor including a magnetic circuit having at least a part constituted by an amorphous magnetic alloy. For detection of the inductance value of the sensor, a DC magnetic field is superposed on an AC magnetic field so that magnetic domains of the alloy tend to be aligned. The sensor output can be increased significantly over that of the conventional sensor in which only the AC magnetic field is employed, while hysteresis of the output is reduced. The temperature characteristic is also improved.
Inventors
- 👤 Ichiro Yamashita
- 👤 Hiroyuki Hase
- 👤 Yukihiko Ise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:48
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/16; G01L1/00; G01L1/12; G01L1/125; G01L1/127; Y; Y10; Y10S; Y10S73/00; Y10S73/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
An amorphous magnetic alloy sensor device comprising: a magnetic circuit including an amorphous magnetic alloy exhibiting magnetostriction, a strain being produced in said amorphous magnetic alloy when pressure is applied thereto; and, a coil for applying a magnetic field to said magnetic circuit, said magnetic field having an alternating magnetic field component on which is superimposed a direct current magnetic field component, the intensity of the magnetic field being greater than the field strength which results in maximum permeability of said amorphous magnetic alloy and less than the intensity inducing 95% of the saturation magnetization thereof, whereby a change in the inductance of said magnetic circuit corresponds to a change in the pressure applied to said amorphous magnetic alloy.
Claim 2
Dependent Claim
119 words
An amorphous magnetic alloy sensor device comprising: a magnetic circuit including an amorphous magnetic alloy exhibiting magnetostriction, a strain being produced in said amorphous magnetic alloy when pressure is applied thereto; and, a coil for applying a magnetic field to said magnetic circuit, said magnetic field having an alternating magnetic field component on which is superimposed a direct current magnetic field component, the intensity of the magnetic field being greater than the field strength which results in maximum permeability of said amorphous magnetic alloy and less than the intensity inducing 95% of the saturation magnetization thereof, whereby a change in the inductance of said magnetic circuit corresponds to a change in the pressure applied to said amorphous magnetic alloy.
References Cited (Backward Citations)
US3007063A
Cited
US4412454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |