Microphone assembly

• US 20060067554A1
• Filed: 09/20/2005
• Published: 03/30/2006
• Est. Priority Date: 09/20/2004
• Status: Active Grant

• Current Assignee: Sonion Nederland BV
• Original Assignee: Sonion Nederland BV
• Inventors: Jorgensen, Martin Bondo, Rombach, Pirmin, Halteren, Aart Zeger Van
• Granted Patent: US 7,715,583 B2
• Time in Patent Office: Days
• US Class Current: 381/369
• CPC Class Codes: H04R 17/02 Microphones
• CPC Class Codes: H04R 19/005 using semiconductor materials

Abstract

A microphone assembly comprising a housing in which a transducer element is positioned. In the housing, an upper and a lower chamber are defined, the lower chamber extending at least at one edge of the transducer element and potentially to an upper side thereof. An element, such as a horse-shoe shaped element or a circular element, is provided for separating the upper side of the transducer element into the upper and lower chambers. The transducer element is fixed using flexible fixing means, and space is provided at one or more sides of the transducer element to take up thermal expansion and retraction of the housing and the transducer element.

Claims

1. A microphone assembly comprising:

a microphone casing comprising an internal surface and having a miniature transducer element disposed therein, the miniature transducer element being bounded by first and second oppositely arranged outer surfaces and a peripheral edge surface, the miniature transducer element comprising a pressure sensitive part; and

a first internal chamber delimited by the second outer surface of the miniature transducer element and the internal surface of the microphone casing,

wherein the first internal chamber extends around a portion of the peripheral edge surface of the miniature transducer element.

2. A microphone assembly according to claim 1, further comprising an attachment means adapted to attach the first outer surface of the miniature transducer element to the internal surface of the microphone casing, the attachment means comprising a layer of a flexible gluing agent.

3. A microphone assembly according to claim 2, wherein the first outer surface of the miniature transducer element abuts the internal surface of the microphone casing with the flexible gluing agent interposed there between.

4. A microphone assembly according to claim 1, wherein a distance of at least 50-1000 μ

m exists between the portion of the peripheral edge surface of the miniature transducer element and the internal surface of the microphone casing.

5. A microphone assembly according to claim 1, wherein a minimum distance of at least 50-1000 μ

m exists between each of at least two portions of the peripheral edge surface of the miniature transducer element and the internal surface of the microphone casing.

6. A microphone assembly according to claim 1, wherein the first internal chamber extends above a portion of the first outer surface of the transducer element.

7. A microphone assembly according to claim 6, wherein one or more attachment means have, in a plane of the pressure sensitive part, a horse-shoe shaped cross section or a circular cross section.

8. A microphone assembly according to claim 7, wherein the one or more attachment means comprises an acoustical seal between the first internal chamber and a second internal microphone chamber, the second internal microphone chamber extending above the pressure sensitive part of the miniature transducer element and being acoustically coupled to a sound inlet of the microphone casing.

9. A microphone assembly according to claim 8, wherein the miniature transducer element is positioned so that the sound inlet and the pressure sensitive part overlap, in the plane of the pressure sensitive part, and wherein the one or more attachment means encircle, in the plane of the pressure sensitive part, the sound inlet and the pressure sensitive part.

10. A microphone assembly according to claim 1, further comprising a substantially circular vent or opening connecting a first side of the pressure sensitive element with another side thereof, the vent or opening having diameter between about 3 and about 100 μ

m.

11. A microphone assembly according to claim 1, wherein a second internal chamber is delimited by the internal surface of the microphone casing and at least part of the first outer surface, including the pressure sensitive element of the miniature transducer element, the microphone assembly further comprising one or more electric or electronic components electrically connected to the miniature transducer element and being positioned in the second internal chamber.