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JPS63120597

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DESCRIPTION JPS63120597
[0001]
FIELD OF THE INVENTION The present invention relates to a close-talking dynamic microphone
that reduces the effects of ambient noise and is mainly used for speech and vocals. Prior Art FIG.
3 is a side sectional view of a conventional close talk type dynamic microphone, and FIG. 4 shows
its output frequency characteristics. Magnetic yoke 1, pole piece 2, magnet 3, acoustic resistance
material 5, equalizer 6 , In a close talk type dynamic microphone composed of the diaphragm 7,
the voice coil 8 and the terminal plate 9, when used near the speaker's mouth, the two-page
output frequency characteristic 12 against the ambient noise and the talk The S / N is improved
only by the portion indicated by the difference 14 with the output frequency characteristic 13
for the voice of the person. However, in the above-mentioned conventional close talk type
dynamic microphone, as shown by the output frequency characteristic 13, the voice of the
speaker is picked up at a high level up to a low frequency band. As a result, the sound quality
tends to be unclear, and it is effective only for applications with high ambient noise, and can not
be used for multiple purposes. It is an object of the present invention to eliminate such
drawbacks and to obtain a close-talking dynamic microphone that can be used for multiple
purposes. Means for Solving the Problems In order to achieve the above object, the present
invention is to provide a small hole having an additional mass communicating with an air
chamber inside the diaphragm on a part of a sound hole piece attached to a pole piece. is there.
Operation The present invention has the following effects and effects by the above configuration.
That is, a part of the sound hole piece affixed to the pole piece (a small hole having an additive
mass communicating with the air chamber inner surface air chamber is provided to attenuate the
low frequency output frequency characteristic which causes unclear sound quality And an output
frequency characteristic level of 150 to 300 (Hz), which is an important frequency band in a
microphone for vocals, can be increased. Embodiment 1 FIG. 1 shows the configuration of an
embodiment of the present invention, and FIG. 2 shows the output frequency characteristic in an
13-05-2019
1
embodiment of the present invention. In FIG. 1, 1 is a magnetic yoke, 2 is a pole piece, 3 is a
magnet, 4 is a sound hole piece attached to the pole piece 2, 5 is an acoustic resistance material
attached to the sound hole piece 4, 6 is Equalizer, 7 is a diaphragm, 8 is a voice coil attached to
diaphragm 7, 9 is a terminal plate, and 10 is a diaphragm formed of pole piece 2, sound hole
piece 4, acoustic resistance member 5, and diaphragm 7. The inner air chamber 11 is a small
hole communicating with the inner air chamber 10 of the diaphragm formed by the sound hole
piece 4 and the pole piece 2. In FIG. 2, 12 is an output in the front direction of the plane wave
sound source. The frequency characteristic, 13 is an output frequency characteristic in the front
direction in the spherical wave sound source (close talk).
In this case, the additional mass of the small hole 11 formed by the sound hole piece 4 and the
pole piece 2 provides resonance at an intermediate frequency of 150 to 300 (Hz) which is an
important frequency band in the microphone for vocals. By controlling the acoustic resistance of
the small hole 11 formed by the hole piece 4 and the pole piece 2, the output of 150 to 300 (Hz)
of the output frequency characteristic 13 in the front direction in the spherical wave sound
source (close talk) It is possible to obtain a close-talking dynamic microphone in which the level
is increased and the output level in the low frequency band which causes unclear sound quality is
attenuated. Effect of the Invention As is apparent from the above-mentioned embodiments, the
present invention is such that small holes provided in a part of the sound hole piece and having
an additional mass communicate with the air chamber inside the diaphragm, Realize a closetalking dynamic microphone not only used as a speech microphone, but also suitable as a vocal
microphone without losing the effect of the close-talking micro five-page phone to reduce the
effect That car can.
[0002]
Brief description of the drawings
[0003]
Fig. 1 shows a close-talking type dieto magnetic yoke according to an embodiment of the present
invention 2 pole piece 3 magnet 4 sound hole piece 5 acoustic resistance material 10 ...
diaphragm inner surface air chamber, 11 ... small hole.
Name of agent Attorney Nakao Toru 11 people from the number /-, 9 notation Yof Figure 2
13-05-2019
2
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