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US 7,358,724 B2Granted
Integrated magnetic flux concentrator
AssigneeAllegro MicroSystems, LLC
InventorsWilliam P. Taylor, Richard Dickinson, Michael C. Doogue
Life of this patent
Estimating the term…
Abstract
A method and apparatus provide a substrate having a depression into which a magnetic material is disposed, forming a magnetic flux concentrator and/or a permanent magnet. A magnetic field sensing element can be disposed proximate to the depression.
Claims29
Apparatus, comprising:
- a substrate having first and second opposing surfaces;
- a magnetic field sensing element disposed on the first surface of the substrate, having first and second opposing magnetic field sensing element surfaces generally parallel to the first surface of the substrate;
- a depression disposed in the second surface of the substrate and generally aligned with the magnetic field sensing element, wherein the depression has a first depression surface generally parallel to the first surface of the substrate and adjacent to the magnetic field sensing element and a second depression surface adjacent to the first depression surface;
- and
- a magnetic material layer disposed on at least one of the first depression surface or the second depression surface.
2 more elements
Dependencies are inferred from the claim text.