| 摘要 |
PROBLEM TO BE SOLVED: To provide a condenser microphone that can achieve the reduction of a thickness and numbers of parts. SOLUTION: The condenser microphone forms an electret condenser with a diaphragm (4) whose spherical edge is fixed to one end face of a diaphragm ring (7), a conical frustum section (5A) whose center portion is protruded in the form of a frustum of a cone, and a back electrode (5) having a brim (5B) at its periphery, and is characterized by a structure in which the diaphragm ring is inserted and attached in a casing (2) having an opening while the diaphragm butt-contacts with the inner end face of the casing, a protruded portion of the form of a frustum of a cone is inserted in a ring of the inserted and attached diaphragm ring, one surface of the brim butt-contacts with the other end face of the diaphragm ring, a circuit board (6) is placed on the other surface of the brim, the circuit board has circuit devices positioned in a recess part on the rear side of the protruded portion, and the circuit board is fixed to the casing. COPYRIGHT: (C)2008,JPO&INPIT
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