JPS61206391U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention.
FIG. 2 is a sectional view showing a conventional example. In the figure, 1 is the housing, 2 is the grit, 3 is the sound wave introduction port, 4 is the back air chamber, 5 is the back electrode, 6 is the insulator, 7 is the diaphragm, 11 is the first acoustic resistor, and 13 is the through hole. , 14 is a second acoustic resistor, 15
17 is a disk body, 17 is an operating shaft, 18 is a lever, and 20 is an acoustic resistance variable means.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical housing with one end open as a sound receiving surface, a diaphragm disposed on the sound receiving surface side of the housing, and a rear side of the diaphragm. In a condenser microphone, back electrodes supported by insulating seats are arranged oppositely at a predetermined distance, and an air chamber of a predetermined volume is formed behind the insulating seats and communicating with the back side of the back electrodes, The side wall of the housing incorporates a velocity component that directly communicates with the back side of the back electrode without passing through the air chamber and over a shorter distance than when passing through the air chamber. A condenser microphone characterized by having a sound wave introduction port. (2) In claim (1) for utility model registration, the air chamber is formed by two cavity cups that are nested together to vary the volume while maintaining an airtight state, and communicates with the back side of the back electrode. A condenser microphone characterized in that an acoustic resistor whose acoustic resistance can be adjusted is provided at an end of a communicating path.