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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a condenser
microphone according to the present invention. In the figure, 1 is a case, 2 is a diaphragm, 5 is a
back electrode, 6 is an insulating material, 7 is a weir, 9 is a nut, and 12 is a back air chamber. 1
75 1
[Detailed description of the invention] 2, l) Thinking ai ~. O-Yo 94 y-o, j Concave circle provides
an icrophone with a condenser that can be easily adjusted without sacrificing other
characteristics. An embodiment of this invention will be described with reference to the
drawings. In the case of 1.148-96935i-[12 l Fi cylindrical case, the upper part of the case 2 is
fixed with the diaphragm 2 at the upper surface thereof. 3. The surrounding lower surface is
positioned and attacked by the spacer 4. A back electrode 5 is fixed by an insulating material 6 at
a position separated by a mounting gap 10 by a spacer 4 on the back surface of the diaphragm 2.
The material of the insulating material 6 is, for example, a soft and elastic material such as
rubber or synthetic resin, and the sweat 7 is provided on the back of the O back electrode 5. -It
penetrates the center of the above-mentioned insulating material 6 located in the back. The
insulating material 6 Vi filter effect and the electrical insulation effect on the case 1 of the back
electrode 5 are combined. A screw is formed in the collar 7 of the back electrode 5, and a nut 9 is
screwed into a place where the screw protrudes from the insulating material 6 via a washer 8. In
the back air chamber surrounded by the back electrode 5 and the insulating material 6 in the
back air chamber surrounded by the back electrode 5 and the insulating material 6, the air vent
provided in the 11 Fi back electrode 5 (2) 4B-96936-03 Since the insulating material 6 is
compressed when this is tightened and the volume of the back air chamber 12 is reduced as a
result, the air resistance to the vibration of the diaphragm 2 increases and the microphone in a
state of low sensitivity When the nut 9 is gradually loosened, the volume of the back air chamber
12 is increased contrary to the above-mentioned case, the air resistance to the vibration of the
diaphragm 2 is reduced, and the sensitivity is increased. As described above, this invention can
provide a condenser microphone capable of freely adjusting the sensitivity characteristics within
a certain range with extremely simple operation. Since this adjustment has no effect on the
relationship between the position of the diaphragm 2 and the back pole 5 and the air flow
between the back air chamber 12 and the back of the microphone, the other characteristic of the
condenser microphone -t, that is, the frequency characteristic , There is an advantage that can be
performed without affecting the directional characteristics at all.
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description, jps4896936
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