Patent ID: 8050443
Filing Date: 2011-11-01
Classification: H04R,H05K,Y02P

Abstract:
1. A microphone mounting structure, comprising: an electret condenser which comprises a back plate having an electret on an internal surface thereof and a diaphragm facing the electret at a distance therefrom; a circuit board which has a sound through-hole and external terminals on an external surface thereof; a capsule with an opening which houses the electret condenser and the circuit board so that the circuit board, at an internal surface thereof, faces the diaphragm at a distance therefrom and closes, at the external surface thereof, the opening of the capsule; and a mounting board which has a sound receiving through-hole and connection terminals on an internal surface thereof that are disposed to correspond to the respective external terminals and are configured to be brought into contact with the corresponding external terminals, wherein one of the external terminals has a ring shape and surrounds the sound through-hole; one of the connection terminals corresponding to the one external terminal has a ring shape and surrounds the sound receiving through-hole; either the external terminals or the connection terminals have a bump shape protruding from the external surface of the circuit board or the internal surface of the mounting board and the other terminals, the connection terminals or the external terminals, have a conductor pattern; and the circuit board is mounted on the mounting board such that the external terminals contact the corresponding connection terminals, so that the ring-shaped one external terminal and the corresponding ring-shaped one connection terminal that are in contact with each other form an enclosed space between the circuit board and the mounting board, and that the sound through-hole and the sound receiving through-hole are placed within the enclosed space at different locations not to overlap each other in a direction perpendicular to the circuit board, whereby the enclosed space constitutes a sound diffraction structure for sound waves communicating between the sound through-hole and the sound receiving through-hole.