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Micro-microphone

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Micro-microphone

Details

Inventors: Lenhard-Backhaus, Hugo; Pribyl, Richard;
Assignee: AKG Acoustics GmbH (Vienna, AT)
Primary Examiner: Kuntz; Curtis
Assistant Examiner: Ni; Suhan
Attorney, Agent or Firm: Kueffner; Friedrich

A micro-microphone, for attachment to the clothing or directly to the body of a user, has a housing with a housing mantle, an end plate connected to a first end of the housing mantle, and a bottom plate connected to the second end of the housing mantle. The housing mantle has one or more openings, each covered by a membrane positioned external to the housing mantle. The housing and the membranes thus define an inner hollow space inside the housing. A flaccid diaphragm is connected externally to a portion of the housing and encloses together with the portion of the housing a compensation chamber. The flaccid diaphragm seals the compensation chamber moisture-tightly. A component of high acoustic impedance connects the inner hollow space inside the housing to the compensation chamber. Pressure compensation is thus realized while moisture is excluded from the interior of the microphone.

DETAILED DESCRIPTION What is claimed is: 1.
A micro-microphone for attachment to the clothing or directly to the body of a user, the micro-microphone comprising: a housing having a housing mantle with a first end and a second end, an end plate connected to the first end, and a bottom plate connected to the second end; the housing mantle having one or more openings; one or more membranes positioned external to the housing mantle; each one of the membranes configured to cover one of the openings of the housing mantle and thus defining an inner hollow space inside the housing; a flaccid diaphragm connected externally to a portion of the housing and enclosing together with the portion of the housing a compensation chamber, wherein the flaccid diaphragm is configured to seal the compensation chamber moisture-tightly; a component of high acoustic impedance configured to connect the inner hollow space inside the housing to the compensation chamber.
2.
The micro-microphone according to claim 1, wherein the component of high acoustic impedance is a tube.
3.
The micro-microphone according to claim 2, wherein the tube has an inner diameter of approximately 70 .
mu.
m and a length of 3 to 4 mm.
4.
The micro-microphone according to claim 2, wherein the tube is made of a corrosion-resistant material.
5.
The micro-microphone according to claim 4, wherein the corrosion-resistant material is stainless steel or German silver.
6.
The micro-microphone according to claim 4, wherein the corrosion-resistant material is a plastic.
7.
The micro-microphone according to claim 1, wherein the component of high acoustic impedance is made of open-pore foamed material.
8.
The micro-microphone according to claim 1, wherein the flaccid diaphragm is made of polycarbonate, polyurethane, rubber or an elastomer.
9.
The micro-microphone according to claim 1, wherein the flaccid diaphragm is made of a metal foil.
10.
The micro-microphone according to claim 1, further comprising a ring member configured to fasten the flaccid diaphragm to the end plate

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