Patent ID: 6700986
Filing Date: 2004-03-02
Classification: H04R

Abstract:
A microphone characteristic adjustment device comprising:a microphone main unit that contains microphone elements in a hollow, cylindrical housing with a back surface thereof sealed, said housing including a diaphragm disposed on a front side thereof and openings formed in a peripheral wall portion thereof for communicating a space formed behind said diaphragm with an outside of said housing; packing formed of an elastic member, being fitted over or wound around a periphery of said microphone main unit for securing, openings being formed therein at locations corresponding to positions of the openings in said housing of said microphone main unit; and an adjustment ring, having a hollow, cylindrical shape to be fitted over a periphery of said packing, for rotating around the periphery of said packing while keeping in contact with the periphery of said packing to form a ventilation path for setting one of the openings in said packing to be communicated with the outside or not to be communicated.