Linear angular sensor with magnetoresistors
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0582690
(2000-06-29)
|
우선권정보 |
FR-0000018 (1998-01-05) |
국제출원번호 |
PCT/FR99/00001
(1999-01-04)
|
국제공개번호 |
WO99/35469
(1999-07-15)
|
발명자
/ 주소 |
- Vieux-Rochaz, Line
- Vaudaine, Marie-Helene
- Cuchet, Robert
- Braisaz, Thierry
|
출원인 / 주소 |
- Commissariat a l'Energie Atomique
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
7 |
초록
▼
At least two magnetoresistors laid out perpendicularly are used. These magnetoresistors are installed in a bridge, the measurement signal being taken from the mid-point of the bridge. This signal is linear over a very wide range. Application to measurement of the orientation of a magnetic field or t
At least two magnetoresistors laid out perpendicularly are used. These magnetoresistors are installed in a bridge, the measurement signal being taken from the mid-point of the bridge. This signal is linear over a very wide range. Application to measurement of the orientation of a magnetic field or the angular position of an object.
대표청구항
▼
1. A linear angular sensor constituted by two magnetoresistors of a material with giant magnetoresistance effect and with isotropic response, said magnetoresistors being positioned perpendicularly to one another, wherein each of said two magnetoresistors is in the form of a tape, each of said magnet
1. A linear angular sensor constituted by two magnetoresistors of a material with giant magnetoresistance effect and with isotropic response, said magnetoresistors being positioned perpendicularly to one another, wherein each of said two magnetoresistors is in the form of a tape, each of said magnetoresistors having a shape anisotropy such that its response in a magnetic field is anisotropic, said magnetoresistors being connected in series and forming a bridge with two ends and a midpoint, said midpoint providing a substantially linear signal over an angular range of 90°, a power supply means being connected at the ends of the bridge, and means for measuring the unbalance of the bridge being connected at the midpoint of the bridge. 2. A linear angular sensor comprising a first sensor as claimed in claim 1, said first sensor having two first magnetoresistors, forming a first bridge with two first ends and a first midpoint, and comprising a second sensor as claimed in claim 1, said second sensor having two second magnetoresistors forming a second bridge with two second ends and a second midpoint, said first ends of said first bridge being connected with said second ends of said second bridge, said first and second magnetoresistors forming a Wheatstone bridge, the power supply means powering said Wheatstone bridge between said first and second connected ends, and the measurement means being connected between said first and second midpoints. 3. A linear angular sensor according to claim 2, wherein each magnetoresistor is in the form of a folded tape. 4. A linear angular sensor according to claim 2, wherein the magnetoresistors are laid out in a square. 5. A linear angular sensor according to claim 4, comprising four connection pads arranged at the four corners of the square formed by the magnetoresistors, each magnetoresistor being connected to two of said pads at its ends. 6. A linear angular sensor according to claim 2, and further comprising at least one resistance made of a magnetoresistive material placed in series between the power supply means and one of the ends of the bridge, the sensitivity of this magnetoresistive material to the magnetic field being at least as good as the sensitivity of the magnetoresistors of the bridge. 7. A linear angular sensor according to claim 2, and further comprising a resistance made of a magnetoresistive material placed in parallel with the measurement means between the two midpoints, the sensitivity of this magnetoresistive material to the magnetic field being at last as good as the sensitivity of the magnetoresistors in the bridge. 8. A linear angular sensor according to claim 1, wherein the magnetoresistors are made from a stack of layers selected from the group consisting of FeNi/Ag, Fe/Cr, Fe/Cu and NiFe/Cu. 9. A linear angular sensor according to claim 1, wherein anisotropy shape is achieved by etching. 10. A linear angular sensor according to claim 1, wherein the signal is linear within 5% over said angular range of 90°.
이 특허에 인용된 특허 (7)
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Jeffers Frederick J. (Escondido CA) Smith Neil (San Diego CA), Apparatus and method for measurement of magnetic remanence-thickness product of thin magnetic layers.
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Dovek Moris M. (San Carlos CA) Fontana ; Jr. Robert E. (San Jose CA) Speriosu Virgil S. (San Jose CA) Spong Jaquelin K. (San Jose CA), Bridge circuit magnetic field sensor having spin valve magnetoresistive elements formed on common substrate.
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Glassey Eugene A. (San Diego CA), Gas weights compensation method for liquid depth gauging system.
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Pant Bharat B. ; Wan Hong, Magnetic field sensor for isotropically sensing an incident magnetic field in a sensor plane.
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Grnberg Peter (Jlich DEX), Magnetic field sensor with ferromagnetic thin layers having magnetically antiparallel polarized components.
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Tchertkov Igor ; Klinkhamer Jon, Magnetoresistive displacement sensor and variable resistor using a moving domain wall.
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Brockmuller Uwe (Oberwerrn DEX) Muller Achim (Dittelbrunn DEX), Rotational speed-detecting device with rod-shaped sensor.
이 특허를 인용한 특허 (7)
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Aimuta, Kyohei; Mita, Masahiro, Angle detection apparatus and position detection apparatus.
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Wan,Hong, Dual axis magnetic sensor.
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Govari,Assaf; Altmann,Andres Claudio; Ephrath,Yaron, Magnetic sensor assembly.
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Dressler, Cyril; Fermon, Claude; Pannetier-Lecoeur, Myriam; Cyrille, Marie-Claire; Campiglio, Paolo, Magnetoresistance element with an improved seed layer to promote an improved response to magnetic fields.
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Campiglio, Paolo; Cadugan, Bryan; Fermon, Claude; Lassalle-Balier, Rémy, Magnetoresistance element with improved response to magnetic fields.
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Fermon, Claude; Pannetier-Lecoeur, Myriam; Cyrille, Marie-Claire; Dressler, Cyril; Campiglio, Paolo, Magnetoresistance element with improved response to magnetic fields.
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Fermon, Claude; Campiglio, Paolo; Cadugan, Bryan, Spin valve magnetoresistance element with improved response to magnetic fields.
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