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DESCRIPTION JPS6120492

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DESCRIPTION JPS6120492
[0001]
TECHNICAL FIELD The present invention relates to a nondirectional microphone using a boxshaped microphone case. Prior Art Configuration and Its Problem FIG. 1 shows a cross-sectional
view of a conventional nondirectional microphone. The configuration of this conventional
example will be described below with reference to FIG. In FIG. 1, 1 is a front part constituting a
microphone case, 2 is a back part, 3 is a microphone unit, 4 is a sound hole provided in the front
part 1 of the microphone case, and 5 is a wind pressure noise reduction. A filter material
provided inside the sound hole 4, 6 is a front air chamber provided between the sound hole 4 of
the front part 1 of the microphone case and the microphone unit 3 for controlling the frequency
characteristic, 7 is a detail Although not shown, an output cord connected to the microphone unit
3. Next, the operation of the above conventional example will be described. In FIG. 1, when a
sound wave is introduced from the sound hole 4 provided in the front part 1 of the microphone
case, the sound wave passes through the filter material 5 and reaches the microphone unit 3
through the front air chamber 6. And converted into an electrical signal, which is taken out by
the output code 7. On the other hand, considering the wind pressure noise, the wind pressure
applied to the sound hole 4 provided on the front surface portion IK of the microphone case is
reduced to some extent by the resistance component of the filter material 5, but the front air
chamber 6 is provided on the front surface portion IK of the case. Because it is sealed at a
portion other than the sound hole 4, it also reaches the diaphragm of the microphone unit 3 and
is greatly sensed as wind pressure noise. Therefore, in order to reduce wind pressure noise as
compared with the prior art, it has been practiced to reduce wind pressure by increasing the
mesh density of the button and the filter material 5 and increasing the resistance component.
However, when the resistance component of the filter material 5 is increased as described above,
it directly affects the acoustic characteristics, and therefore, the density of the filter material 5
can not be increased to a certain extent. As a result, there has been a problem that the reduction
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of wind pressure noise is greatly hindered. SUMMARY OF THE INVENTION The present invention
is an excellent nondirectional microphone which can effectively reduce the wind pressure noise
without sacrificing the acoustic characteristics with a simple configuration, which eliminates the
disadvantages of the prior art. The purpose is to provide According to the present invention, in
order to achieve the above object, a hollow air chamber of sufficient size is provided for the
microphone unit inside the microphone case, and the microphone unit is installed in the middle
of the air chamber, A sound hole is provided on each of the front surface of the case and at least
one other surface except the front surface, and the air pressure inside the air chamber due to the
wind pressure from the sound hole which has been exhausted is removed It is configured to
reduce wind pressure noise that leaves the microphone unit.
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, a front
surface portion constituting a 10-microphone case, 11 a rear surface portion constituting a
microphone case, and 12 a microphone unit. 13 is a sound hole provided on the front face
portion IK of the case, 14 is a filter material provided inside the sound hole 13. Reference
numeral 15 is a front air chamber formed between the microphone unit holder 19 and the front
surface of the microphone unit 12. Reference numeral 16 is a sound hole provided on the back
portion of the output code 217. Reference numeral 18 is a filter material provided inside the
sound hole 17. 20 h, a hollow air chamber respectively provided on the front and back of the
microphone unit holter 190, 21 is provided in the microphone unit holder 19 to provide air
permeability between the hollow air chambers 20, and the pressure difference between the front
and back of the microphone unit holder 19 is as much as possible. A through hole for preventing
the formation of air bubbles, 22 is another hollow air chamber isolated from the hollow air
chamber 20. Next, the operation of the above embodiment will be described. The wind pressure
applied to the sound hole 13 provided in the front face portion 10 of the case passes through the
filter material 14 and is applied to the hollow air chamber 20. However, through holes 21 are
provided in the microphone unit holder 19 so that no pressure difference occurs before and
after, and a hollow air chamber 20 provided in the rear of the unit holder 19 is provided in the
back face portion 11. The air pressure generated in the hollow air chamber 20 through the filter
material 18 rapidly escapes to the outside, and the pressure change in the hollow air chamber 20
is extremely large. Less. Accordingly, the pressure change is hardly applied to the microphone
unit 12 provided at the middle portion of the hollow air chamber 20, and the noise due to the
wind pressure is extremely reduced. In the present embodiment, the sound holes 17 are formed
in the back surface portion 11 of the microphone case, but the sound holes 17 may be formed in
at least one surface other than the front surface portion 10 of the microphone case. According to
the present invention, as is apparent from the above embodiments, the wind pressure applied
from the sound hole provided on the front surface of the microphone case is effectively removed
to the back through the hollow air chamber provided inside the microphone case. It has the
advantage that noise components due to wind pressure can be significantly reduced. According
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to the present invention, noise components due to wind pressure can be sufficiently reduced
even if filter materials with low mesh density are used as filter materials provided inside the
sound holes formed in the front and back portions of the microphone case. In general, it has the
advantage of being able to reduce the noise component without sacrificing acoustical properties.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a conventional nondirectional microphone, and FIG. 2 is a
cross-sectional view of the nondirectional microphone in an embodiment of the present
invention.
12 Microphone unit 13.17 Sound hole 14.18 Filter material 19 Microphone unit holder 20.22
Hollow air chamber 21 Through hole. Name of Agent Attorney Nakao Toshio Other 1 person
Figure 1 Figure 2
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