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FIELD OF THE INVENTION The present invention relates to a dynamic microphone having
directivity. Configuration of the conventional example and its problems Fig. 1 is a conventional
dynamic microphone? It shows. The configuration of this conventional example will be described
below with reference to FIG. In the figure, reference numeral 1 denotes a magnet, which is
coupled to a yoke 2. 3 is a pole piece, and the pole piece 3 is coupled with a magnet IK to form a
magnetic circuit. Reference numeral 5 denotes an imaging plate, and the diaphragm 5 is coupled
to the case 6. A movable wire ring 4 is coupled to the diaphragm 6. The yoke 2 is coupled to the
case 6. 7.9 is a sound hole. 8.10 is an acoustic resistance material, and the sound hole 7.9r is
covered by a case 6vc. 11 is a back room. Next, the operation of the above-described
conventional example will be described. The sound hole 7 gives the speed operation for obtaining
directivity, and the velocity component introduced from the sound confuster? It controls by the
acoustic resistance which the acoustic resistance material 8 has, and can obtain any directivity. In
order to obtain an arbitrary acoustic resistance, it is used as an acoustic resistance material such
as cloth or wire mesh, and it is adjusted by the size of the opening area of the sound hole 7.
However, in the above-mentioned conventional example, when the thickness of the case
increases and the length of the sound hole increases, the equivalent mass CM of the sound hole 7
increases, and the whole synthesized with the acoustic resistance material Because the frequency
dependency of the impedance (R j? M: R is the acoustic resistance of the acoustic resistance
material) increases, the directivity condition is broken when the frequency is high, and there is a
drawback that a good directivity can not be obtained. SUMMARY OF THE INVENTION The object
of the present invention is to eliminate the drawbacks of the above-mentioned prior art and to
provide a dynamic microphone having a good directivity. Constitution of the Invention Is the
Invention the Purpose? In order to achieve this, the inner diameter side and the outer diameter
side of the opening area t of the sound hole are formed differently, and the equivalent mass CM
of this sound hole is controlled to an arbitrary value so that case design can be easily performed.
Effects that can be DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an
embodiment of the present invention will be described below with reference to the drawings. In
FIG. 2, reference numeral 21 denotes a magnet, and the magnet 21 is coupled to the yoke 22. A
pole piece 23 is coupled to the magnet 21 to form a magnetic circuit. Reference numeral 26
denotes a diaphragm, and the diaphragm 25 is coupled to the case 26. A movable wire ring 24 is
coupled to the diaphragm 26. The yoke 22 is coupled to the case 26.
Reference numeral 27.29 is a sound hole, which has an opening area sound on the inner
diameter side larger than an opening area on the outer diameter side. Reference numeral 28.30
is an acoustic resistance material, which is coupled to the sound hole 27, 29i and the cover case
26. 31 is a back room. Next, the operation of the above embodiment f + 1 will be described. The
sound hole 2R gives a directional speed operation which can be obtained. The equivalent mass
('M) possessed by the sound hole 2T and the acoustic resistance (R) possessed by the acoustic
resistance material are impedances connected in series, and are expressed by (RRj?M). In this
practical example, with respect to the opening area of the case 26 on the outer diameter side of
the sound hole 2-7 for adjusting all the acoustic resistances, the opening area on the inner
diameter side? The equivalent mass CM) v of the sound hole is enlarged and reduced, and as
shown in FIG. 3, the directivity in the high region is improved as in the conventional directivity a
[as opposed to vc1800 directivity. . As described above, since the equivalent mass of the sound
hole 2 can be set to an arbitrary value without being limited by the thickness of the case 6, the
case design can easily be performed without restrictions such as size, shape, and strength. Have
the advantage of FIG. 4 is a sectional view of an essential part showing a second embodiment 1
of the present invention. A small hole 32 and a large hole 33 are combined to form a pit and an
acoustic resistance 28 is provided on the outside. Further, FIG. 6 shows the third embodiment of
the present invention, in which 28 acoustic resistance members are provided at the connecting
portion between the small holes 32 and the large holes 33. As shown in FIG. The present
invention is configured as described above, and the following effects can be obtained. (A) It is
possible to set the velocity component introduction part without being influenced by the case
design. (B) On the contrary, any impedance can be obtained easily without being taken by the
case design which can be obtained or the outer diameter side opening area of the sound hole 27.
Brief description of the drawings
1 is a cross-sectional view of a conventional dynamic microphone, FIG. 2 is a cross-sectional view
of a dynamic microphone according to an embodiment of the present invention, and FIG. 3 is an
example of frequency characteristics of the dynamic microphone of FIG.
The figure which shows, FIG. 4 and FIG. 5 are principal part sectional drawings of the sound hole
part of the other Example of this invention. 21 ...... magnet, 22 ...... yoke, 23 ...... pole piece, 24 ......
movable coil, 26 ...... diaphragm 26 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Sound resistance
material. Name of agent Attorney Nakao Toshio and one other person.
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