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US 2014/0176126 A1Published application
Magnetic Field Sensor Arrangements and Associated Methods
AssigneeAllegro MicroSystems, LLC
InventorsAndreas P. Friedrich, Nicolas Yoakim, Andrea Foletto
Life of this patent
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Abstract
Magnetic field sensor arrangements and methods provide a magnetic field sensor positioned proximate to a magnet with an axis of sensitivity aligned relative to the magnet in orientations that provide a good sensitivity and a mechanical difference from other arrangements.
Claims20
A magnetic field sensor arrangement comprising:
- a magnet having two parallel opposing surfaces separated by a magnet thickness and having at least one north pole disposed proximate to at least one south pole, wherein a line between a center of the at least one north pole and a center of the at least one south pole lies in an x-y plane surfaces;
- a magnetic field sensor comprising a magnetic field sensing element with a center and with at least one major response axis disposed in a major response plane intersecting the magnetic field sensing element, wherein the magnetic field sensor is disposed proximate to the magnet with the major response plane within forty-five degrees of perpendicular to the x-y plane.
A method of sensing a movement of an object, comprising:
- attaching to the object a magnet having two opposing surfaces separated by a magnet thickness and having at least one north pole disposed proximate to at least one south pole, wherein a line between a center of the at least one north pole and a center of the at least one south pole lies in an x-y plane;
- placing, proximate to the magnet, a magnetic field sensor comprising a magnetic field sensing element with a center and with at least one major response axis disposed in a major response plane intersecting the magnetic field sensing element, wherein the magnetic field sensor is disposed with the major response plane within forty-five degrees of perpendicular to the x-y plane.
Dependencies are inferred from the claim text.