Systems and methods for generating damped electromagnetically actuated planar motion for audio-frequency vibrations

  • US 10,659,885 B2
  • Filed: 10/03/2019
  • Issued: 05/19/2020
  • Est. Priority Date: 09/24/2014
  • Status: Active Grant
First Claim
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1. An apparatus for imparting motion to the skin of a user, the apparatus comprising:

  • a housing;

    a plurality of coils capable of carrying electrical current;

    a plurality of magnets arranged in operative proximity to the plurality of coils;

    a moving portion comprising an inertial mass and the plurality of magnets;

    a suspension comprising a plurality of flexures that guides the moving portion in a planar motion with respect to the housing and the plurality of conductive coils;

    wherein movement of the moving portion is damped by a ferrofluid in physical contact with at least the moving portion; and

    wherein the ferrofluid reduces at least a mechanical resonance within the frequency range of 40-200 Hz in response to electrical signals applied to the plurality of conductive coils.

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