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Earphone

  • US 5,396,563 A
  • Filed: 05/26/1994
  • Issued: 03/07/1995
  • Est. Priority Date: 06/03/1991
  • Status: Expired due to Term
First Claim
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1. An earphone comprising:

  • an earplug of sound insulating and flexible material for fitting in and shutting an external auditory meatus of an ear so as to acoustically isolate the external auditory meatus from outside the ear; and

    an elastic vibration generator positioned out of the external auditory meatus and responsive to an electric signal supplied thereto for generating and applying an elastic wave corresponding to the supplied electric signal to an outer end of the earplug inserted in the external auditory meatus, wherein said earplug transmits the elastic wave to an inner end of the earplug, and the inner end of the earplug vibrates at the frequency of the electric signal to permit air confined in a space between the inner end of the earplug and an ear drum of a user to vibrate so that a sound wave corresponding to the electric signal is transmitted to the ear drum.

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