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US 11,662,258 B2Granted
Force sensor integrated on substrate
AssigneeWiliot, Ltd.
InventorsYaron Elboim, Eylon Gersten
Life of this patent
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Abstract
A Internet of Things (IoT) tag for measuring transmitted force applied on the IoT tag, including a substrate, a force sensor integrated on the substrate, and a sensing circuit integrated on the substrate and configured to output a digital word measurement in response to an applied force on the force sensor.
Claims2
An Internet of Things (IoT) tag for measuring transmitted force applied on the IoT tag, comprising:
- a substrate;
- a force sensor integrated on the substrate;
- a plurality of antennas printed on the substrate, the plurality of antennas including at least a transmitter antenna connected to an integrated circuit (IC), and a harvester antenna connected to the integrated circuit;
- and
- a sensing circuit integrated on the substrate and configured to output a digital word measurement in response to an applied force on the force sensor, wherein the sensing circuit further comprises:
- an oscillating circuit;
- and
- a sensor logic configured to:
- determine a frequency from a pulse signal outputted from the oscillating circuit;
- correspond the determined frequency with the applied force;
- and
- compute the applied force based on the determined frequency,
- wherein the sensor logic is further configured to include a counter and a flip-flop circuit;
- wherein the force sensor comprises a sensing layer, a conductive layer, and a spacer layer between the sensing layer and the conductive layer;
- wherein the sensing layer comprises at least a film including conductive sub-micrometer sized particles, wherein the particles contact the conductive layer upon application of the force on the sensing layer;
- wherein the conductive layer includes a metallic conductor and the metallic conductor comprises any one of conductive ink or nano-material ink that is printed on the substrate;
- wherein the metallic conductor comprises conductive metallic material that is formed on the substrate by etching;
- wherein the spacer layer comprises a plastic film;
- wherein the oscillating circuit includes a ring oscillator having a plurality of inverters;
- wherein the sensing circuit further comprises a memory to store the digital word measurement;
- wherein the frequency is determined based on one of a resistance or a capacitance measured by the force sensor;
- wherein the substrate comprises a polyester film;
- wherein the force sensor is placed any of:
- on top of the IC or around the IC;
- wherein the Integrated Circuit (IC) and the force sensor are included in a die;
- and
- wherein a form factor of the IoT tag is package-less.
24 more elements
A force sensing device comprising:
- a substrate;
- and
- a sensor integrated on the substrate, the sensor comprises a sensing layer, a conductive layer, and a spacer between the sensing layer and the conductive layer, wherein the sensing layer comprises at least a film including sub-micrometer sized particles;
- a sensing circuit integrated on the substrate and configured to output a digital word measurement in response to an applied force on the sensor, wherein the sensing circuit further comprises:
- an oscillating circuit;
- and
- a sensor logic configured to:
- determine a frequency from a pulse signal outputted from the oscillating circuit;
- correspond the determined frequency with the applied force;
- and
- compute the applied force based on the determined frequency,
- wherein the sensor logic is further configured to include a counter and a flip-flop circuit;
- wherein the sensing layer includes an outer ring surrounding an inner area;
- wherein the particles include non-conductive particles arranged on the outer ring and conductive particles arranged on the inner area;
- wherein the spacer is arranged along the outer ring;
- wherein the conductive layer includes electrodes arranged within an inner area of the conductive layer;
- and
- wherein the conductive particles contact the conductive layer upon the application of the force on the sensing layer.
15 more elements
Dependencies are inferred from the claim text.