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Non-occludable transducers for in-the-ear applications

  • US 5,220,612 A
  • Filed: 12/20/1991
  • Issued: 06/15/1993
  • Est. Priority Date: 12/20/1991
  • Status: Expired due to Term
First Claim
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1. An electroacoustic transducer comprising, in combination,a casing having a wall of hollow tubular shape and diaphragm means substantially closing and sealing the casing near one end thereof, the casing being shaped for insertion in the ear to define a space generally bounded by the ear canal, the tympanic membrane and the diaphragm means, the diaphragm means comprising a central portion with its peripheral edge spaced from said wall and a thin, flexible film extending from said edge toward said wall to form a surround, the surround being formed inwardly of the casing interior to provide elastic stability to the surround under external pressure, andan electromechanical motor supported within the casing and having a vibratory member connected to said central portion,the transducer further having stop means adapted to limit the movement of said central portion inwardly of the casing to a substantially predetermined extent.

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