Magnetic field cancellation for strain sensors
First Claim
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1. An electronic device comprising:
- an enclosure housing a display;
a cover sheet positioned over the display and forming an external surface of the electronic device;
a magnetic interference source positioned within the enclosure; and
a strain-sensing layer positioned beneath the cover sheet and comprising;
a substrate comprising an upper surface and a lower surface;
a first strain-sensing element comprising;
a first upper resistive structure comprising a first set of conductive traces and coupled to the upper surface of the substrate; and
a first lower resistive structure comprising a second set of conductive traces aligned along an axis passing perpendicular through the substrate with the first set of conductive traces and coupled to the lower surface of the substrate; and
a second strain-sensing element positioned adjacent the magnetic interference source and comprising;
a second upper resistive structure comprising a third set of conductive traces and coupled to the upper surface of the substrate; and
a second lower resistive structure comprising a fourth set of conductive traces and coupled to the lower surface of the substrate;
whereinat least a portion of the fourth set of conductive traces does not align along the axis with the third set of conductive traces.
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Abstract
A strain-responsive sensor incorporating a strain-sensitive element is disclosed. The strain-sensitive element includes a matched-pair of resistive structures disposed on opposite sides of a substrate. One resistive structure is coupled to a crossover, either a physical crossover or a soft crossover, such that current within the resistive structures of the matched pair flows in the same direction. In addition, one resistive structure of the matched pair has a different loop area than the other resistive structure.
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Citations
15 Claims
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1. An electronic device comprising:
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an enclosure housing a display; a cover sheet positioned over the display and forming an external surface of the electronic device; a magnetic interference source positioned within the enclosure; and a strain-sensing layer positioned beneath the cover sheet and comprising; a substrate comprising an upper surface and a lower surface; a first strain-sensing element comprising; a first upper resistive structure comprising a first set of conductive traces and coupled to the upper surface of the substrate; and a first lower resistive structure comprising a second set of conductive traces aligned along an axis passing perpendicular through the substrate with the first set of conductive traces and coupled to the lower surface of the substrate; and a second strain-sensing element positioned adjacent the magnetic interference source and comprising; a second upper resistive structure comprising a third set of conductive traces and coupled to the upper surface of the substrate; and a second lower resistive structure comprising a fourth set of conductive traces and coupled to the lower surface of the substrate;
whereinat least a portion of the fourth set of conductive traces does not align along the axis with the third set of conductive traces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification