MICROMACHINED RESONANT MAGNETIC FIELD SENSORS
First Claim
1. A micromachined magnetic field sensor comprising:
- a substrate;
a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem along a first axis; and
Lorentz force acting on the drive subsystem along a second axis in response to a magnetic field along a third axis;
a sense subsystem, the sense subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
wherein a portion of the sense subsystem moves along a fourth axis;
a coupling spring between the drive subsystem and the sense subsystem which causes motion of the sense subsystem in response to the magnetic field; and
a position transducer to detect the motion of the sense subsystem.
1 Assignment
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Accused Products
Abstract
A micromachined magnetic field sensor comprising is disclosed. The micromachined magnetic field comprises a substrate; a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate; a mechanism for providing an electrical current through the drive subsystem along a first axis; and Lorentz force acting on the drive subsystem along a second axis in response to a magnetic field along a third axis. The micromachined magnetic field sensor also includes a sense subsystem, the sense subsystem comprises a plurality of beams, and at least one anchor connected to the substrate; wherein a portion of the sense subsystem moves along a fourth axis; a coupling spring between the drive subsystem and the sense subsystem which causes motion of the sense subsystem in response to the magnetic field; and a position transducer to detect the motion of the sense subsystem.
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Citations
20 Claims
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1. A micromachined magnetic field sensor comprising:
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a substrate; a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem along a first axis; and
Lorentz force acting on the drive subsystem along a second axis in response to a magnetic field along a third axis;a sense subsystem, the sense subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
wherein a portion of the sense subsystem moves along a fourth axis;a coupling spring between the drive subsystem and the sense subsystem which causes motion of the sense subsystem in response to the magnetic field; and a position transducer to detect the motion of the sense subsystem. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A micromachined resonant magnetic field sensor comprising:
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a substrate; a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem along a first axis; and
Lorentz force acting on the drive subsystem along a second axis in response to a magnetic field along a third axis; anda position transducer to detect the motion of the drive subsystem; and a self-test actuator causes force acting on the drive subsystem along the second axis. - View Dependent Claims (11, 12)
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13. A micromachined resonant magnetic field sensor comprising:
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a substrate; a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem along a first axis; and
Lorentz force acting on the drive subsystem along a second axis in response to a magnetic field along a third axis a position transducer to detect the motion of the drive subsystem;a stiffness tuning block to change the stiffness of the drive subsystem in order to compensate manufacturing variation. - View Dependent Claims (14)
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15. A multi-axis magnetic field sensor system comprising:
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at least one micromachined magnetic field sensor comprising;
a substrate;
a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem along a first axis; and
Lorentz force acting on the drive subsystem along a second axis in response to a magnetic field along a third axis;
a sense subsystem, the sense subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
wherein a portion of the sense subsystem moves along a fourth axis, a coupling spring between the drive subsystem and the sense subsystem which causes motion of the sense subsystem in response to the magnetic field; and
a position transducer to detect the motion of the sense subsystem; andat least one magnetic field sensor that responds to a magnetic field perpendicular to the third axis. - View Dependent Claims (16, 17)
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18. A multi-axis magnetic field sensor system comprising:
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a substrate wherein a Z axis is normal to the plane of the substrate and an X-Y plane is parallel to the plane of the substrate. a Z-axis micromachined magnetic field sensor, wherein the Z axis micromachined magnetic field sensor comprises a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem in the X-Y plane; and
Lorentz force acting on the drive subsystem in the X-Y plane in response to a magnetic field along the Z axis;
a sense subsystem, the sense subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
wherein a portion of the sense subsystem moves in the X-Y plane;
a coupling spring between the drive subsystem and the sense subsystem which causes motion of the sense subsystem in response to the magnetic field; and
a position transducer to detect the motion of the sense subsystem;a X-axis micromachined magnetic field sensor, wherein the X-axis micromachined magnetic field sensor comprises a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem in the X-Y plane; and
Lorentz force acting on the drive subsystem along the Z-axis in response to a magnetic field along the X-axis;
a sense subsystem, the sense subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
wherein a portion of the sense subsystem moves along the Z-axis;
a coupling spring between the drive subsystem and the sense subsystem which causes motion of the sense subsystem in response to the magnetic field; and
a position transducer to detect the motion of the sense subsystem; anda Y-axis micromachined magnetic field sensor, wherein the Y-axis micromachined magnetic field sensor comprises a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem in the X-Y plane; and
Lorentz force acting on the drive subsystem along the Z-axis in response to a magnetic field along the Y axis;
a sense subsystem comprising a plurality of beams, and at least one anchor connected to the substrate;
wherein a portion of the sense subsystem moves along the Z-axis;
a coupling spring between the drive subsystem and the sense subsystem which causes motion of the sense subsystem in response to the magnetic field; and
a position transducer to detect the motion of the sense subsystem.
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19. A micromachined magnetic field sensor comprising:
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a substrate; a drive subsystem, the drive subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem along a first axis; and
Lorentz force acting on the drive subsystem along a second axis in response to a magnetic field along a third axis;a sense subsystem, the sense subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
wherein a portion of the sense subsystem moves along a fourth axis;a coupling spring between the drive subsystem and the sense subsystem which causes motion of sense subsystem in response to the magnetic field; a position transducer to detect the motion of the sense subsystem; and a self-test actuator causes force acting on the drive subsystem along the second axis.
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20. A micromachined magnetic field sensor comprising:
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a substrate; a drive subsystem, the drive subsystem comprises a plurality of beams, at least one anchor connected to the substrate;
a mechanism for providing an electrical current through the drive subsystem along a first axis; and
Lorentz force acting on the drive subsystem along a second axis in response to a magnetic field along a third axis;a sense subsystem, the sense subsystem comprises a plurality of beams, and at least one anchor connected to the substrate;
wherein a portion of the sense subsystem moves along a fourth axis;a coupling spring between the drive subsystem and the sense subsystem which causes motion of sense subsystem in response to the magnetic field; a position transducer to detect the motion of the sense subsystem; and a stiffness tuning block to change the stiffness of the sense subsystem in order to compensate manufacturing variation.
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Specification