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JPS6128298

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DESCRIPTION JPS6128298
[0001]
FIELD OF THE INVENTION The present invention relates to a dynamic microphone unit mainly
used for vocals. Prior Art Configuration and Its Problem FIG. 1 is a side sectional view of a
conventional dynamic microphone unit. In FIG. 1, reference numeral 1 denotes a magnetic
circuit, and the magnetic circuit 1 is composed of a magnet 1a, a magnetic yoke 11) and a pole
piece 1c. 2 is a synthetic resin case integrally molding the magnetic circuit unit 1, 3 is an
equalizer, 4 is a rear case of synthetic resin, 5 is a diaphragm, 6 is a voice coil mounted on the
diaphragm 5, 7 is an acoustic resistance material is there. Since this dynamic microphone unit
has all the main components arranged at the top, the center of gravity is located at the top, and
when it is used as a finished dynamic microphone product, the output induced to the voice coil 6
by mechanical vibration As a result, it is difficult to take anti-vibration measures to reduce the
vibration resistance, resulting in a complicated structure, and a cost increase. In addition, there is
a disadvantage that the induced noise is also weak due to the influence of the external magnetic
field. SUMMARY OF THE INVENTION It is an object of the present invention to eliminate such
drawbacks and to make it easy to take anti-vibration measures as a finished dynamic microphone
product, and at the same time to provide an excellent dynamic microphone unit with a little
induction noise. . In order to achieve the above object, according to the present invention, a
balancer is fixed to a synthetic resin for integrally molding a magnetic circuit portion, and a ham
pack coil is wound around the balancer in the direction opposite to the voice coil. It has the
advantages of being easy to take anti-vibration measures and reducing inductive noise.
Description of the Embodiment An embodiment of the present invention will be described with
reference to FIG. In FIG. 2, reference numeral 8 is a magnetic circuit unit, and the magnetic
circuit unit 8 is composed of a magnet 8a1 magnetic yoke 81] and a pole piece 8C. 9 is a
synthetic resin integrally molding the magnetic circuit portion 8, 10 is an equalizer, 1 is a rear
case, 12 is an acoustic resistance material. 13 is a diaphragm, 14 is attached to the diaphragm
13-05-2019
1
13, and the voice coil iv disposed in the concave portion of the two-piece magnetic circuit unit 8,
1.5 halancer, 16 is wound around the balancer 15 in the opposite direction to the voice coil. It is
a packed ham pack coil. In this case, the balancer 15 fixed to the guide 9a of the synthetic resin 9
integrally molding the magnetic circuit 8 comprising the magnet 3a, the magnetic yoke 81) and
the pole piece 8c transfers the center of gravity of the dynamic microphone unit downward. , It is
easy to take anti-vibration measures as a finished product microphone.
In addition, inductive noise can be reduced by winding the output of the hampak coil 16
mounted on the outer periphery of the balancer 15 in a direction opposite to that of the voice
coil so as to cancel the output of the voice coil 14 and connecting in series. . The position of the
center of gravity of the balancer 15 can be set in a wide range by selecting the shape and the
material. Effects of the Invention The present invention is apparent from the above-mentioned
embodiments. "A configuration in which a balancer is fixed to a synthetic resin for integrally
molding a magnetic circuit portion, and a ham pack coil is wound around this balancer in the
opposite direction to the voice coil. Since it is 5 to 1, it is easy to take anti-vibration measures and
has the effect of reducing induced noise.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a side sectional view of a conventional dynamic microphone unit, and FIG. 2 is a side
sectional view of a dynamic microphone unit according to an embodiment of the present
invention.
8: magnetic circuit unit, 8a: magnet, 8b: magnetic yoke, 8C: pole piece, 9: synthetic resin, 10:
equalizer, 11: rear case, 12: · · · · · · Sound resistance material, 13 · · · diaphragm, 14 · · · voice coil,
5 · · · Balancer, 16 · · · Hampack coil. Name of agent Attorney Nakao Toshio and one other person
@1
13-05-2019
2
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