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Force-sensing stylus for use with electronic devices

  • US 9,983,696 B2
  • Filed: 09/28/2015
  • Issued: 05/29/2018
  • Est. Priority Date: 09/30/2014
  • Status: Active Grant
First Claim
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1. A stylus, comprising:

  • a housing;

    a tip portion at an end of the housing; and

    a force sensing device electrically connected with the tip portion to sense forces exerted on the tip portion in axial and radial directions, the force sensing device comprising;

    a first membrane extending radially from the housing to the tip portion; and

    a second membrane, axially separated from the first membrane and extending radially from the housing to the tip portion;

    wherein the force sensing device comprises a set of strain gauges on the first membrane, each of the set of strain gauges sensitive to axial and radial forces.

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