Patent ID: 8189820
Filing Date: 2012-05-29
Classification: H04R

Abstract:
1. A microphone assembly comprising: a carrier having a first surface holding an electrical contact element; a silicon-based transducer comprising a displaceable diaphragm and an electrical contact element, said transducer being arranged at a distance above the first surface of the carrier; a conducting material electrically coupled between the electrical contact element of the carrier and the silicon based transducer; and an underfill agent disposed in a space between the silicon based transducer and the carrier, wherein said underfill agent has an underfill coefficient of thermal expansion (CTE) below 40 ppm/° C.; wherein the underfill agent comprises at least a first material or material composition having a first CTE, and a second material or material composition having a second CTE that is lower than the first CTE; and wherein the first material or material composition of the underfill agent is a first material composition comprising an organic polymer-based adhesive component, a catalyst and a hardner, and wherein the second material or material composition of the underfill agent comprises one or more filler materials.