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Wireless earplug with improved sensitivity and form factor

  • US 9,774,946 B2
  • Filed: 10/26/2016
  • Issued: 09/26/2017
  • Est. Priority Date: 08/31/2006
  • Status: Active Grant
First Claim
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1. A wireless communications earplug for use with a magnetic field transmitter, comprising:

  • a) a receiver comprising a coil of wire wound upon a bobbin of magnetic material; and

    b) a speaker having a case at least partially made of magnetic material, an acoustic output and an electrical input coupled to the wire of the receiver;

    wherein the bobbin of the receiver is mounted in sufficiently close proximity to the case of the speaker such that a measured inductance of the coil of the receiver is increased compared to an inductance of the coil of the receiver when the receiver is not mounted to the speaker, and the receiver is oriented such that flux lines passing through the speaker are directed to pass through the coil of the receiver.

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