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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are longitudinal sectional views of a
condenser microphone according to the present invention. In the figure, 1 is a case, 2 moving
plates, 5 is a back electrode, 6 is an insulating material, and 9 is a set screw.
DETAILED DESCRIPTION OF THE INVENTION The present invention can freely convert the
directivity characteristics of a microphone between omnidirectionality and unidirectionality, and
yet has high dust resistance. Condenser microphone-Example 1 of this invention About-If Cf &
dA, it will provide the rooster rooster. FIG. 1 shows a first embodiment of the present invention,
in which 1 is a case of a cylindrical shape. Above the inside of the case 1 ', the diaphragm 2 has
its circumferential concave upper surface vibrating ring 5 (1 48-70628-02 The lower surface is
surrounded by the spacer 4 and positioned and fixed for a second. A back electrode 5 is fixed by
an insulating material 6 in a place separated by a spacer 4 by a spacer 4 on the back surface of
the vibration 2. A weir 7 protrudes from the back surface of the back electrode 5, and the weir 7
penetrates the center of the above-mentioned insulating material 6 located on the back surface of
the back electrode 5. The insulating material 6 is backed with porous plastic, and has an
electrical insulating effect on the case IK as well as a filtering effect on the back electrode 5. As a
material of this insulating material 6, even if it is a thing other than a porous plastic, if it is
porous, it can be used. . Between the back electrode 5 and the insulating material 6, a chamber 8
of an appropriate volume is formed. At the lower end portion of the case 10, a female screw is
engraved 9, and a II-song-like set screw 9 is screwed into the inside to hold the insulating
material 6. In the microphone configured in this way, the insulating material 6 can be easily
exchanged 1: if the set screw 9 is collectively removed. If various different ones are prepared, it is
possible to select the ratio between the sound pressure sensitivity from the front of the
diaphragm 2 and the sound pressure sensitivity from the rear of the diaphragm 2. Therefore,
microphones Ij, i can be obtained by freely converting directivity characteristics between
omnidirectionality and unidirectionality. The second embodiment shown in FIG. 2 corresponds to
the second embodiment of the present invention, which is a modification of the first embodiment.
Therefore, the second embodiment shown in FIG. A common symbol is attached to, and the
description of the structure of this part is omitted. The back of the back electrode 5 has a collar
7a provided with a male screw protruding, and this collar 7a is either tl penetrating the insulator
6 as in the example of @ 1 or stacked on the back of the insulation mA The two disks 10.11
provided are also pierced (tightened with a 1 ° nut 12). The odd # 5 [the holes 10a and 11a of
the wedges 10a and 11a have a constant interval in the circumferential direction respectively in
the first disc 10.11. When the disc 10 ° 11 is relatively rotated, the hole 10m and the hole
11110 change in degree and the acoustic resistance from the back of the slope 2h changes, so
that it is more effective than the first embodiment 11 The directional characteristics can be
Since this device was configured as described above, set screw! By loosening, it is possible to
freely replace several different types of insulating materials with different dimensions of W and
obtain directivity characteristics according to the application. In addition, since the back of the
entire microphone is completely covered with the insulating material 6, the dust resistance can
be enhanced.