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Directional/omnidirectional hearing aid microphone with support

  • US 4,142,072 A
  • Filed: 09/12/1977
  • Issued: 02/27/1979
  • Est. Priority Date: 11/29/1976
  • Status: Expired due to Term
First Claim
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1. A hearing aid with an outer front opening and an outer rear opening which are connectable to the respective sides of a membrane in a microphone within the housing of the hearing aid for directional use, and with mechanical means for closing the outer rear opening for omnidirectional use, in which said closing means is formed and arranged so as in the closing position thereof to establish a narrow acoustically dimensioned sound passageway from the outer opening not closed to the side of the membrane corresponding to the closed outer opening, and wherein the microphone is resiliently suspended within the housing and the microphone is provided with a rigid support at a place opposite the rear port of the microphone.

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