US3753202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Displacement transducer
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1971-04-29
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Granted: 1973-08-14
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Expires: 1991-04-29
Abstract
Abstract A displacement transducer is comprised of an magnetoresistive element, or an elongated semiconductor member having the magnetoresistive effect. A pair of electrodes are affixed at both ends of this magnetoresistive element, and a third electrode at the center. While an electric current is made to flow therethrough from each of the pair of electrodes to the third electrode, an applied magnetic field is moved thereon toward either side of the third electrode to obtain an output voltage due to the magnetoresistive effect of the element. In another embodiment of the invention, wherein a plurality of metal boundaries are formed at intervals between a pair of electrodes at both ends of an magnetoresistive element, a leading end of an applied magnetic field is inclined to such a degree as to extend between at least two adjoining ones of the metal boundaries.
Inventors
- 👤 S Kataoka
- 👤 H Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:28
CPC Classifications
H; H10; H10N; H10N50/00; H10N50/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
A transducer for converting the relative displacement of a unidirectional magnetic field into an electrical signal comprising: two geometrically alike magnetoresistive portions; means for applying electrical energy to said magnetoresistive portions to effect current flow in opposite directions through both portions; means for applying a unidirectional magnetic field simultaneously to both said magnetresistive portions to vary the resistance thereof and coacting with said magnetoresistive portions to allow relative displacement between the unidirectional magnetic field and said magnetoresistive portions; and means connected to said magnetoresistive portions and responsive to the displacement of the unidirectional magnetic field relative thereto for developing an electrical signal having one polarity when the unidirectional magnetic field is displaced in one direction relative to said magnetoresistive portions from a given reference plane and having an opposite polarity when the unidirectional magnetic field is displaced in an opposite directionrelative to said magnetoresistive portions from said reference plane and having a magnitude proportional to the extent of displacement from said reference plane.
Claim 2
Dependent Claim
163 words
A transducer for converting the relative displacement of a unidirectional magnetic field into an electrical signal comprising: two geometrically alike magnetoresistive portions; means for applying electrical energy to said magnetoresistive portions to effect current flow in opposite directions through both portions; means for applying a unidirectional magnetic field simultaneously to both said magnetresistive portions to vary the resistance thereof and coacting with said magnetoresistive portions to allow relative displacement between the unidirectional magnetic field and said magnetoresistive portions; and means connected to said magnetoresistive portions and responsive to the displacement of the unidirectional magnetic field relative thereto for developing an electrical signal having one polarity when the unidirectional magnetic field is displaced in one direction relative to said magnetoresistive portions from a given reference plane and having an opposite polarity when the unidirectional magnetic field is displaced in an opposite directionrelative to said magnetoresistive portions from said reference plane and having a magnitude proportional to the extent of displacement from said reference plane.
Claim 3
Dependent Claim
38 words
A transducer according to claim 1; wherein said two magnetoresistive portions comprise two portions of a single magnetoresistive element each disposed on opposite sides of said reference plane which extends through the geometrical center of said magnetoresistive element.
Claim 4
Dependent Claim
49 words
A transducer according to claim 2; wherein said means for applying electrical energy and said means for developing an electrical signal include a pair of end electrodes each attached to one end of said magnetoresistive element, and a center electrode attached to said magnetoresistive element at its geometrical center.
Claim 5
Dependent Claim
35 words
A transducer according to claim 2, wherein said two magnetoresistive portions comprise two distinct magnetoresistive elements disposed in parallel relationship and having said reference plane extending through the geometrical centers of both said magnetroresistive elements.
Claim 6
Dependent Claim
51 words
A transducer according to claim 4; wherein said means for applying electrical energy and said means for developing an electrical signal include four end electrodes attached respectively to the four ends of said two magnetoresistive elements, and two center electrodes attached respectively to the geometrical centers of said two magnetoresistive elements.
Claim 7
Dependent Claim
26 words
A transducer according to claim 4; wherein said two magnetoresistive elements extend linearly in the directions of relative displacement between same and said unidirectional magnetic field.
Claim 8
Dependent Claim
30 words
A transducer according to claim 4; wherein said two magnetoresistive elements extend curvilinearly along a circular arc in the direction of relative displacement between same and said unidirectional magnetic field.
Claim 9
Dependent Claim
88 words
A transducer according to claim 4; wherein said means for applying electrical energy comprises four end electrodes attached respectively to the four ends of said two magnetoresistive elements, conductors connected to said end electrodes electriCally connecting said two magnetoresistive elements in parallel, and means for applying a voltage across said four electrodes; and wherein said means for developing an output signal comprises a pair of center electrodes attached respectively to the geometrical centers of said two magnetoresistive elements developing thereacross said output signal during use of the transducer.
Claim 10
Dependent Claim
26 words
A transducer according to claim 8; wherein said two magnetoresistive elements extend linearly in the directions of relative displacement between same and said unidirectional magnetic field.
Claim 11
Dependent Claim
30 words
A transducer according to claim 8; wherein said two magnetoresistive elements extend curvilinearly along a circular arc in the direction of relative displacement between same and said unidirectional magnetic field.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |