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JP2011166645

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DESCRIPTION JP2011166645
PROBLEM TO BE SOLVED: It is not necessary to apply a sealing material to a deep position in a
grip case, simplify the assembly work and repair work of the dynamic microphone, make the
whole grip case an air chamber, and stabilize nondirectional components even to low tones
Provide a dynamic microphone obtained by SOLUTION: A cylindrical grip housing 2, a
microphone unit 3 supported on one end side of the grip housing 2, and the microphone unit 3
are connected, and the other end side of the microphone unit 3 of the grip housing 2 And the
ring-shaped elastic body 5 is attached to the connector 4, and the connector attachment portion
2b inside the grip housing 2 is provided with a shoulder 2a which is an inclined surface. The
ring-shaped elastic body 5 of the connector 4 is joined to the inclined surface of the shoulder 2a
to seal the inside of the grip housing 2. [Selected figure] Figure 1
ダイナミックマイクロホン
[0001]
The present invention relates to a dynamic microphone, and more particularly, to the
configuration of an air chamber in a grip housing included in a part of an acoustic circuit of a
dynamic microphone unit.
[0002]
Dynamic microphones generally attach an acoustic resistance to the rear of the diaphragm to
obtain an omnidirectional component.
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1
As described in Patent Document 1, an air chamber is one of the factors that determine the
frequency characteristics of a dynamic (electrodynamic) microphone. In order to operate the
acoustic resistance in a wide frequency band, an air chamber is provided behind the acoustic
resistance. Further, in order to operate the acoustic resistance up to the bass, it is necessary to
increase the capacity of the air chamber to lower the reactance due to the acoustic capacity. In a
hand-held microphone such as for vocals, the air chamber is usually provided in a cylindrically
formed grip housing. One example is described with reference to FIG.
[0003]
The hand-held dynamic microphone 17 includes a grip housing 2 formed in a die-cast cylindrical
shape. The microphone unit 3 is supported on one end side of the grip housing 2. Although not
shown, the microphone unit 3 includes a diaphragm to which a voice coil is attached and a
magnetic generation circuit having a magnetic gap, and the voice coil is disposed so as to be able
to vibrate through the diaphragm in the magnetic gap. It is done. The microphone unit 3 is
attached to one end side of the grip housing 2 via the connection portion 12 in a state where the
rear end side is airtightly inserted into the connection portion 12.
[0004]
A connector mounting portion 2 b is integrally formed on the other end side of the grip housing
2, and the connector 4 is mounted in the connector mounting portion 2 b. The microphone unit 3
and the connector 4 are connected by the lead wire 8. The inside of the grip housing 2 is hollow
and acts as an air chamber 10 of the microphone unit 3.
[0005]
The volume of the air chamber 10 is preferably large in order to improve the sound quality of the
low range. Also, in order to obtain good directivity, it is necessary to prevent air from entering
the air chamber 10 from the outside. Therefore, in the prior art, after the microphone unit 3 and
the connector 4 are connected by the lead wire 8, in the dynamic microphone 17, the
microphone housing 2 and the connector 4 in the grip housing 2 are connected by the sealing
material 11 such as silicon sealant. The four sides are sealed to make the air chamber 10 airtight.
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2
[0006]
However, as shown in FIG. 4, since the dynamic microphone 17 needs to apply the sealing
material 11 at a deep position in the grip housing 2, assembly work and repair work are difficult.
Particularly in the case of repair work, it is difficult to remove the connector 4. Therefore, in the
dynamic microphone described in Patent Document 1, a cavity sleeve provided with a
microphone unit is used. Between the cavity sleeve and the grip housing, an elastic component
that doubles as a shock mount is provided to ensure air tightness of the cavity sleeve and an air
chamber is provided. However, the volume of the cavity sleeve is smaller than that when the
entire grip housing is used for the air chamber, so there is a problem in order to stably obtain the
omnidirectional component up to the bass.
[0007]
JP 2005-277652 A
[0008]
The present invention eliminates the need to apply a sealing material to a deep position in the
grip case, simplifies the assembly and repair work of the dynamic microphone, makes the entire
grip case an air chamber, and reduces non-directional components to more low frequencies. An
object of the present invention is to provide a dynamic microphone which can be obtained stably.
[0009]
The dynamic microphone according to the present invention is mounted on a cylindrical grip
housing, a microphone unit supported on one end side of the grip housing, and the opposite end
side of the microphone unit of the grip housing and connected to the microphone unit A discshaped elastic body attached to the connector, and the connector attachment portion inside the
grip housing is provided with a shoulder which is an inclined surface, and the ring-shaped elastic
body of the connector The most important feature is that the inside of the grip housing is sealed
by being joined to the inclined surface of the shoulder.
[0010]
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3
According to the present invention, the ring-shaped elastic body of the connector is joined to the
sloped surface of the shoulder of the grip case to seal the inside of the grip case, and the entire
grip case is an air chamber, so that no bass is omnidirectional. It is possible to obtain a dynamic
microphone which can stably obtain the sex component.
In addition, since it is not necessary to apply the sealing material at a deep position in the grip
housing, the assembly work and the repair work of the dynamic microphone can be simplified.
[0011]
FIG. 1 is a longitudinal sectional view showing an embodiment of a dynamic microphone
according to the present invention.
It is a disassembled longitudinal cross-sectional view which shows the example of one assembly
process of the said Example.
It is a longitudinal cross-sectional view which shows the example of another assembly process of
the said Example. It is a longitudinal cross-sectional view which shows the example of the
conventional dynamic microphone.
[0012]
Hereinafter, an embodiment of a dynamic microphone according to the present invention will be
described with reference to the drawings. The present invention is not limited to the
configurations of the embodiments described below. The same reference numerals are given to
members having the same configuration as that of the conventional dynamic microphone shown
in FIG.
[0013]
In FIG. 1, the dynamic microphone 1 includes a cylindrical grip housing 2, a microphone unit 3
whose rear end is supported on one end side (upper end side in FIG. 1) of the grip housing 2, and
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4
the grip housing 2. The connector 4 is mounted on the opposite side of the support of the
microphone unit 3 and is electrically connected to the microphone unit 3 as a main component.
A ring-shaped elastic body 5 is attached to the connector 4. At the upper end portion of the
mounting portion of the connector 4 located inside the grip housing 2, a shoulder 2a which is an
inclined surface is provided. The shoulder 2 a is formed along the entire inner circumferential
surface of the grip housing 2 to form a conical surface whose diameter gradually increases from
the bottom to the top. The ring-shaped elastic body 5 attached to the connector 4 is joined to the
conical inclined surface of the shoulder 2a. Therefore, the inside of the grip housing 2 is sealed
by the ring-shaped elastic body 5. The inside of the sealed cavity is used as an air chamber 10
included as a part of the acoustic circuit of the microphone unit 3.
[0014]
The microphone unit 3 has a cylindrical shape and a crowned front end, and the rear end is
airtightly inserted into the connecting portion 12, and the grip housing 2 is formed via the
cylindrical connecting portion 12. It is attached to one end side of the housing by a suitable
method such as press fitting, screwing or bonding. A spherical head case 9 whose inside is
hollow and whose lower part is open is covered at the tip of the grip case 2 on the side of the
microphone unit 3 in order to protect the microphone unit 3 and fixed to the grip case 2 by an
appropriate method It is done. The grip housing 2 gradually decreases in diameter toward the
connector 4 side.
[0015]
Thus, in the connector mounting portion 2 b on the inner peripheral side of the grip housing 2,
the inner peripheral surface of the grip housing 2 and the connector base 6 are sealed by the
ring-shaped elastic body 5, and the back of the microphone unit 3 is A sealed space 10 is formed.
Therefore, since it is not necessary to apply the sealing material 11 at a deep position in the grip
housing 2 as in the conventional example shown in FIG. 4, the work of assembling and repairing
the dynamic microphone 1 is simplified. be able to. Further, the ring-shaped elastic body 5 of the
connector 4 is joined to the inclined surface of the conical shoulder 2 a of the grip housing 2 to
make the inside of the grip housing 2 airtight, and the air chamber in which the entire inside of
the grip housing 2 is sealed. By setting it to 10, it is possible to obtain the dynamic microphone 1
which can stably obtain the nondirectional component up to the bass.
[0016]
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5
The shoulder 2a formed by the conical surface of the grip housing 2 is formed in a step shape in
the longitudinal cross section by reducing the inner diameter of the grip housing 2, and the
diameter is sequentially increased upward in the cylindrical grip housing 2 It inclines to the
direction to enlarge. The opposite end side of the microphone unit 3 is a connector mounting
portion 2b. The outer diameter of the ring-shaped elastic body 5 is larger than the inner diameter
of the connector mounting portion 2b, and the inner diameter of the connector mounting portion
2b is smaller than the outer diameter of the ring-shaped elastic body 5 and larger than the outer
diameter of the connector base 6 It is designed large. By designing in this manner, the connector
4 can be easily fitted into the connector attachment portion 2b at the time of assembly, and the
ring-shaped elastic body 5 of the connector 4 is joined to the inclined surface of the shoulder 2a
to facilitate the inside of the grip housing 2 It can be sealed. In addition, the formation method of
the inclined surface of the shoulder 2a is arbitrary. Further, the size of the inner diameter of the
connector attachment portion 2b and the outer diameter of the ring-shaped elastic body 5 are
not limited to those described above, and the ring-shaped elastic body 5 is joined to the inclined
surface of the shoulder 2a Anything can be selected as long as it is airtight. The attachment
portion of the elastic body 5 to the connector 4 can also be adhered to an appropriate position as
long as the inside of the grip housing 2 can be airtight, and may be provided, for example, on the
outer peripheral portion of the connector base 6.
[0017]
The connector 4 is a connector specified by EIAJ RC-5236 “Latch-lock type round connector for
audio equipment”, that is, a first pin (not shown) for grounding on a cylindrical connector base
6 made of an electrical insulator, and a signal It is possible to use a 3-pin type connector 4 in
which three pins of pin 2 14 used as the hot side of pin 3 and pin 3 of pin 3 15 used as the cold
side of signals are pierced. In addition to the three pins, the connector 4 is provided with a male
screw 7 capable of projecting and retracting in the radial direction of the base 6 and a grounding
terminal plate having female screw holes (not shown). It is electrically connected to the 1st pin
for grounding by the connection fitting etc.
[0018]
The elastic body 5 is bonded to the outer peripheral portion of the printed circuit board 13 on
the upper surface of the connector base 6. A male screw 7 is provided on the side surface of the
connector base 6, and a hole 2c in which the male screw 7 is inserted is provided in the
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6
connector attachment portion 2b. By doing this, by unwinding the male screw 7, the shoulder of
the male screw 7 presses the inner peripheral surface of the grip housing 2, and the pressing
portion between the shoulder of the male screw 7 and the inner peripheral surface of the grip
housing 2 On the opposite side of the connector base 6, the connector base 6 is pressed against
the inner peripheral surface of the grip housing 2, and the connector 4 is fixed to the connector
mounting portion 2b. The grip housing 2 and the terminal plate 16 for grounding are electrically
connected by inserting a driver (not shown) through the hole 2c and rewinding the male screw 7
to abut the inner surface of the connector connection portion 2b from the connector base 6 . In
addition, as a fixing method of the connector 4, not only the above-mentioned thing but an
appropriate structure can be selected. The microphone unit 3 may be the same as that used in
the conventional example described with reference to FIG. That is, since the microphone unit 3 is
of a dynamic type (electrodynamic type), the inside thereof includes a diaphragm to which a
voice coil is attached and a magnetic generation circuit having a magnetic gap. The voice coil is
disposed vibratably through the diaphragm.
[0019]
When attaching the connector 4 to the grip housing 2, as shown in FIG. 2, the connector 4 is
inserted into the connector attachment portion 2 b from the opening on the microphone unit 3
attachment side of the grip housing 2. Furthermore, as shown in FIG. 3, the ring-shaped elastic
body 5 attached to the connector 4 is joined to the ring-shaped elastic body 5 on the shoulder 2
a formed of a conical surface provided on the connector attachment portion 2. Until the inner
circumference of the grip housing 2 is sealed. Thus, the air chamber 10 is formed in the grip
housing 2. The outer diameter of the ring-shaped elastic body 5 is larger than the inner diameter
of the connector mounting portion 2b, and the inner diameter of the connector mounting portion
2b is smaller than the outer diameter of the ring-shaped elastic body 5, and the outer diameter of
the connector base 6 It is designed to be larger than. Therefore, the connector 4 can be easily
fitted in the connector attachment part 2b. In addition, the ring-shaped elastic body 5 of the
connector 4 is joined to the inclined surface of the shoulder 2a, whereby the inside of the grip
housing 2 can be easily sealed. Further, by unwinding the male screw 7, the shoulder of the male
screw 7 presses the connector mounting portion 2b, and the connector 4 is fixed to the
connector mounting portion 2b. According to the sealing structure of the outer periphery of the
connector 4 and the inner peripheral surface of the grip housing 2 described above, a sealing
material such as a silicone sealant is not necessary, but in some cases, a sealing material may be
used in combination.
[0020]
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7
In the actual assembling operation, after the microphone unit 3 and the connector 4 are
connected in advance by the lead wire 8, the microphone unit 3 and the connector 4 are attached
to the grip housing 2 as described above. In the final assembly process of the microphone, a head
case 9 made of, for example, mesh metal for protecting the microphone unit 20 is placed.
[0021]
Thus, the dynamic microphone 1 shown in FIG. 1 is finally assembled. Then, for example, even if
the connector 4 is broken due to a drop impact or the like, the dynamic microphone can be easily
obtained because there is no sealing material 11 such as silicon sealant for sealing the air
chamber 10 as in the conventional example shown in FIG. 1 can be disassembled and repaired,
and assembly after repair is easy. Also in the assembly after repair, the ring-shaped elastic body
5 of the connector 4 is joined to the inclined surface of the shoulder 2 a of the grip housing 2 to
seal the inside of the grip housing 2, and the entire grip housing 2 is an air chamber 10. By doing
this, it is possible to obtain the dynamic microphone 1 capable of stably obtaining the
nondirectional component up to the bass.
[0022]
As mentioned above, although an example of embodiment of this invention was described, this
invention is not limited to the structure of this Example, A design change can be carried out in
the range which does not deviate from the technical idea described in the claim. For example, the
configuration of the connector 4 of the dynamic microphone 1 and the shape of the grip housing
2 according to the above embodiment of the present invention are not limited to dynamic
microphones requiring nondirectional components, and may be used for other dynamic
microphones. Good.
[0023]
DESCRIPTION OF SYMBOLS 1 dynamic microphone 2 grip housing 2a shoulder 2b connector
mounting part 2c hole 3 microphone unit 4 connector 5 elastic body 6 connector base 7 male
screw 8 lead wire 9 head case 10 air chamber 11 sealing material 12 connection part 13 printed
circuit board 14 2 Pin 15 3rd pin 16 Grounding terminal board
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