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JPH0479597

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DESCRIPTION JPH0479597
[0001]
FIELD OF THE INVENTION The present invention relates to a line type directional dynamic
microphone whose main application is sound collection and louding. Prior Art FIG. S shows a side
sectional view of a conventional line type directional dynamic microphone, and the microphone
unit 3 is held and fixed by the microphone body case 1 and the front case 2, and the front case
72 has an acoustic resistance phase 5. The sound tube 4 to which the attachment is fixed is
attached, and the outer case 76 is fixed to the front case 72 by the front ring 7 to which the front
net 8 is attached and fixed. SUMMARY OF THE INVENTION In the line type directional dynamic
microphone having the above-mentioned configuration, the front case 2, the microphone unit 3
and the acoustic tube 4 are attached by the air chamber 11 formed by a part, the second In the
output frequency characteristics shown in the figure, the output frequency characteristics 14
from the front direction of the line type directional dynamic microphone and the directivity
characteristics 15 which is the output frequency characteristics to the sound pressure from the
rear direction show high pitches as shown by the broken lines. The high-frequency band portion
of the directional characteristics is degraded due to the generation of acoustic resonance in the
section (3 to 5 KHz), and such a line type directional dynamic microphone is used as a part of a
loudspeaker In such a case, there is a drawback that howling in the high-pitched range is likely to
occur. An object of the present invention is to eliminate such a drawback and to obtain a line
type directional dynamic microphone which is less likely to generate noise when used as a part
of a loudspeaker. Means of Solving the Problems In order to achieve the above object, according
to the present invention, an air chamber formed by a front case, a microphone unit and an
acoustic tube base and a small hole connecting a free sound field are connected to the acoustic
tube and the microphone unit. Provided in the department. Operation The present invention has
the following nine effects by the above configuration. That is, the air chamber is formed by
providing the front case and the microphone output at the junction of the sound tube and the
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1
microphone unit with a small hole having a small equivalent mass leading to the free sound field
from the air chamber formed by the sound tube base. According to the above, part of the acoustic
energy in the above can be emitted to the free sound field through the small holes to suppress
the acoustic resonance and prevent the deterioration of the directivity characteristic in the highpitched area. Embodiment 1 FIG. 1 shows the configuration of an embodiment of the present
invention, and FIG. 2 shows the output frequency characteristic. 1 is a main body case of a
microphone, 2 is a front case, 3 is a microphone unit, 4 is an acoustic tube clamped and fixed to
the front case 2, 51-1: an acoustic resistance material adhesively fixed to the acoustic tube 4, 6 is
an acoustic An outer case intended to protect the tube 4 and the acoustic resistance member 5, a
front ring 7 for fixing the outer case 6 by fastening and fixing the tip to the acoustic tube 4, 8 is
adhesively fixed to the front ring 7 Front net, 9 (beam line, 10 is an output connector fixed to the
main case 1, 11 is an air chamber formed by the front case 2, the microphone unit 3 and the
acoustic pipe 4, 12 is free from the air chamber 11 It is a small hole provided in the rq ′ + 1
surface case 2 that follows the sound field.
In this case, a portion of the energy in the air chamber 11 is provided by providing a small hole
12 with a small equivalent mass leading to the outside (free sound field) of the front case 2 on
the inner surface of the front case 2 in contact with the microphone unit 3. Is emitted from the
small hole into the free sound field, and the output frequency characteristic becomes the one
having the frontality 14 and the directivity characteristic 15 shown by the solid line in FIG. 2 and
there is no acoustic resonance in the high region and the entire frequency range of the
microphone output In the above, it is possible to obtain a line-type directional dynamic
microphone with excellent directivity. As is clear from the above embodiments, the present
invention is a line type directional dynamic that is excellent in directivity characteristics over the
entire frequency range of the microphone output and is hard to generate howling when used as a
part of a loudspeaker. A microphone can be realized
[0002]
Brief description of the drawings
[0003]
1 is a side sectional view of a line type directional dynamic microphone according to an
embodiment of the present invention, FIG. 2 is an output frequency characteristic view of the line
type directional dynamic microphone, and FIG. 3 is a side section of the conventional line type
microphone FIG.
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1······················································································
· · · , 6 ... outer case, end ... ... front ring, 8 ... front net, 11 ... air chamber, 12 ... small hole.
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