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JP2006237939

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DESCRIPTION JP2006237939
PROBLEM TO BE SOLVED: To obtain a back air chamber excellent in air tightness in a dynamic
microphone having a back air chamber (air chamber) of a predetermined volume communicated
with the rear of a diaphragm via an acoustic resistance material. A microphone unit 10 having a
diaphragm 11 having a voice coil 113 and a magnetic circuit 12 having a magnetic gap in which
the voice coil 113 is vibratable is supported, and the microphone unit 10 is supported from the
magnetic circuit side. And a cylindrical unit holder 20 having a back air chamber 20A
communicating with the back side of the diaphragm 11 via an acoustic resistance material,
wherein the back air chamber 20A is coaxially fitted coaxially in the unit holder 20 In the
dynamic microphone formed by the first cylindrical portion 22 and the second cylindrical
portion 23, a gasket formed in a ring shape for preventing sound wave leakage between the first
cylindrical portion 22 and the second cylindrical portion 23 Combine in an integrated manner
with 28 in between. [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 a back air chamber (air chamber) which determines the performance of the
dynamic microphone such as directivity, sensitivity and frequency response.
[0002]
Among the dynamic microphones, as described in Patent Document 1, since the non-directional
dynamic microphone is resistance control, an acoustic resistance material including a back air
chamber (air chamber), felt, etc. behind the diaphragm The acoustic resistance sets the frequency
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response and sensitivity.
[0003]
Further, in the unidirectional dynamic microphone, the sound wave entering from the rear
acoustic terminal is divided by the acoustic mass of the rear acoustic terminal and the acoustic
resistance and added to the rear of the diaphragm to set directivity.
Thus, in the dynamic microphone, the acoustic resistance provided at the portion communicating
with the back air chamber from the rear of the diaphragm plays an important role.
[0004]
In particular, in the case of a unidirectional dynamic microphone, in order to improve directional
frequency response, the acoustic resistance is composed of a plurality of back air chambers and
an acoustic resistance material acoustically coupled therebetween.
One example is described with reference to FIGS. 3 and 4. FIG. 3 is a cross-sectional view
showing the microphone unit 10 and the unit holder 20 included as main parts of the dynamic
microphone, and FIG. 4 is an exploded cross-sectional view thereof.
[0005]
According to this, the microphone unit 10 includes the diaphragm 11 and the magnetic circuit
12. The diaphragm 11 has a center dome 111 and a sub dome 112 integrally connected to the
center dome 111. A voice coil 113 is integrally attached to the center dome 111 by an adhesive
or the like.
[0006]
The magnetic circuit 12 includes a disc-shaped permanent magnet 121, a center pole piece 122
disposed on one pole side of the permanent magnet 121, and a tray-shaped tail yoke disposed on
the other pole of the permanent magnet 121. And a side yoke 124 disposed at the end of the tail
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yoke 123 and forming a magnetic gap with the center pole piece 122.
[0007]
The microphone unit 10 is supported by the unit holder 20 from the magnetic circuit 12 side.
The peripheral portion of the sub dome 112 is fixed to the unit holder 20 so that the voice coil
113 vibrates in the magnetic gap. In addition, in front of the diaphragm 11, a resonator 13
having a front acoustic terminal 131 is covered.
[0008]
Since this dynamic microphone is unidirectional, the unit holder 20 is provided with a rear
acoustic terminal 21 communicating with the rear (rear side) of the diaphragm 11 via a
predetermined acoustic resistance material 211. Further, a terminal plate 27 to which a lead wire
(not shown) of the voice coil 113 is connected is provided on an outer peripheral portion of the
unit holder 20.
[0009]
The unit holder 20 is formed in a cylindrical shape, and has a predetermined volume of back air
chamber (air chamber) 20A communicating with the rear space of the diaphragm 11 through a
sound hole 123a bored in the tail yoke 123 in the inside thereof. Is equipped.
[0010]
In this example, the back air chamber 20A is formed by the first cylindrical portion 22 and the
second cylindrical portion 23 coaxially fitted in the unit holder 20 in an airtight manner.
The first cylindrical portion 22 and the second cylindrical portion 23 have sound holes 221 and
231 to which acoustic resistance members 25 and 26 such as felt are attached on one side
respectively, and the other open end 222 , 232 are fitted in the unit holder 20 in a state where
the back air chambers 20A of a predetermined volume are formed inside.
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[0011]
In this example, a middle cylinder 30 having a back air chamber 30A is further connected to the
rear end side of the unit holder 20 as shown by the imaginary line in FIG. Therefore, this
dynamic microphone is provided with two air chambers of the first back air chamber 20A and
the second back air chamber 30A, and the space behind the diaphragm 11 is separated by the
first back air chamber 20A through the acoustic resistance material 25. The first back air
chamber 20A is in communication with the second back air chamber 30A through the acoustic
resistance member 26, and the acoustic mass and the acoustic resistance provide predetermined
directivity and directional frequency response.
[0012]
Finally, the unit holder 20 is supported together with the middle cylinder 30 in a cylindrical
microphone housing (microphone grip) (not shown) made of aluminum or brass alloy via a shock
mount member (not shown) made of a rubber elastic body. Ru.
[0013]
Japanese Utility Model Publication No. 6-48295
[0014]
In the dynamic microphone configured as described above, the back air chamber 20A is formed
by the first cylindrical portion 22 and the second cylindrical portion 23, but conventionally,
those open end portions 222 and 232 are bonded with an adhesive. To ensure the airtightness of
the joint.
[0015]
In that case, a rubber-based adhesive with an organic solvent is generally used, but this type of
adhesive reduces its volume by evaporation of the organic solvent (the thickness of the adhesive
shrinks), and in some cases, holes are opened, Airtightness between the butt open ends 222, 232
may not be maintained, and sound leakage may occur from the back air chamber 20A.
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In addition, it is necessary to fix the first cylindrical portion 22 and the second cylindrical portion
23 with a jig (not shown) until the adhesive is solidified, and there is a problem in terms of
productivity.
[0016]
Therefore, an object of the present invention is to provide a back air chamber having excellent
airtightness in a dynamic microphone having a back air chamber (air chamber) of a
predetermined volume communicated with the rear of the diaphragm via an acoustic resistance
material. .
[0017]
In order to solve the above problems, the invention according to claim 1 is a microphone unit
provided with a diaphragm having a voice coil and a magnetic circuit having a magnetic gap in
which the voice coil is disposed so as to be able to vibrate; And a cylindrical unit holder having a
back air chamber supported from the magnetic circuit side and internally communicating with
the back side of the diaphragm via an acoustic resistance material, wherein the back air chamber
is coaxial with the unit holder. In a dynamic microphone formed of a first cylindrical portion and
a second cylindrical portion which are airtightly fitted, the first cylindrical portion and the second
cylindrical portion are provided for preventing sound wave leakage between their butting end
surfaces. It is characterized in that the ring-shaped gaskets are integrally combined in a state of
sandwiching the gaskets.
[0018]
The invention according to claim 2 is characterized in that, in the above-mentioned claim 1, the
gasket is made of a rubber elastic body.
[0019]
The invention according to claim 3 is characterized in that, in the above-mentioned claim 1 or 2,
between the above-mentioned second cylindrical portion on the diamagnetic circuit side of the
above-mentioned first cylindrical portion and the above-mentioned second cylindrical portion,
and the above-mentioned unit holder A locking means is provided for fixing the second
cylindrical portion to the unit holder in a state where a predetermined pressing force is applied
to the gasket.
[0020]
In the invention according to a fourth aspect, in the third aspect, the locking means is elastically
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deformed in the locking hole formed on the unit holder side, and in the locking hole on the
second cylindrical portion side. And a locking claw formed to be fitted together.
[0021]
According to the invention as set forth in claim 1, the first cylindrical portion and the second
cylindrical portion forming the back air chamber sandwich the gasket formed in the ring shape
for preventing the sound wave leakage between the butting end faces thereof. By combining
them in an integrated manner in the state, it is possible to reliably prevent an airtight failure
between the first cylindrical portion and the second cylindrical portion.
[0022]
According to the second aspect of the present invention, the gasket is deformed (expanded) in
the radial direction, so that the joint portion between the first cylindrical portion and the second
cylindrical portion is used. Airtightness between the and the unit holder can also be ensured.
[0023]
The second cylindrical portion is fixed to the unit holder in a state where a predetermined
pressing force is applied to the gasket between the unit holder and the second cylindrical portion
on the diamagnetic circuit side of the first cylindrical portion and the second cylindrical portion
According to the third aspect of the present invention, it is not necessary to hold the second
cylindrical portion with a special jig until the adhesive solidifies (is dried).
In addition, airtightness can be ensured without using an adhesive in some cases.
[0024]
Further, as a locking means, a combination of a locking hole formed on the unit holder side and a
locking claw formed on the second cylindrical portion side so as to be fitted to the locking hole
with elastic deformation. According to the fourth aspect of the present invention, it is possible to
securely fix the second cylindrical portion to the unit holder by a so-called one-touch simple
operation of simply pushing the second cylindrical portion into the unit holder. it can.
[0025]
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Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2,
but the present invention is not limited thereto.
FIG. 1 is a cross-sectional view showing a microphone unit and a unit holder provided as main
parts of a dynamic microphone according to the present invention, and FIG. 2 is an exploded
cross-sectional view thereof corresponding to FIGS. The same reference numerals are used for
components that do not need to be changed.
[0026]
In the dynamic microphone of the present invention, the microphone unit 10 includes the
diaphragm 11 and the magnetic circuit 12, but the configuration of these may be the same as the
conventional example of FIGS. 3 and 4 described above.
[0027]
That is, the diaphragm 11 has a center dome 111 and a sub dome 112 integrally provided
around the center dome 111, and the voice coil 113 is integrally attached to the center dome
111 by an adhesive or the like.
[0028]
Further, the magnetic circuit 12 includes a disk-shaped permanent magnet 121, a center pole
piece 122 disposed on one of the pole sides of the permanent magnet 121, and a disc-like
member disposed on the other pole of the permanent magnet 121. It may be configured to
include the tail yoke 123 and the side yokes 124 disposed at the end of the tail yoke 123 and
forming a magnetic gap with the center pole piece 122.
[0029]
The microphone unit 10 is supported by the unit holder 20 from the magnetic circuit 12 side,
and the diaphragm 11 has the peripheral portion of the sub dome 112 fixed to the unit holder 20
so that the voice coil 113 vibrates in the magnetic gap. .
In addition, a resonator 13 having a front acoustic terminal 131 is covered so as to cover the
front of the diaphragm 11.
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[0030]
Since this dynamic microphone is unidirectional, the unit holder 20 is provided with a rear
acoustic terminal 21 communicating with the rear (rear side) of the diaphragm 11 via a
predetermined acoustic resistance material 211.
In addition, a terminal plate 27 to which a lead wire (not shown) of the voice coil 113 is
connected may be provided on the outer periphery of the unit holder 20.
[0031]
The unit holder 20 is formed in a cylindrical shape, and has a predetermined volume of back air
chamber (air chamber) 20A communicating with the rear space of the diaphragm 11 through a
sound hole 123a bored in the tail yoke 123 in the inside thereof. Is equipped.
The back air chamber 20A is formed of a first cylindrical portion 22 and a second cylindrical
portion 23 coaxially and airtightly fitted in the unit holder 20.
[0032]
The first cylindrical portion 22 and the second cylindrical portion 23 have sound holes 221 and
231 to which acoustic resistance members 25 and 26 such as felt are attached on one side
respectively, and the other open end 222 , 232 are butted in the unit holder 20 to form a back
air chamber 20A of a predetermined volume therein, but according to the present invention, the
open end 222 and the open end 232 In the meantime, a ring-shaped gasket 28 is sandwiched to
prevent sound waves from leaking between them.
[0033]
The gasket 28 may be, for example, a normal synthetic resin ring that does not have air
permeability, but is preferably a rubber elastic body that deforms in compression.
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According to this, when the first cylindrical portion 22 and the second cylindrical portion 23 are
strongly tightened, the gasket 28 expands in the radial direction, so that not only the joint
between the open end 222 and the open end 232 but also the joint thereof Airtightness between
the part and the unit holder 20 can also be ensured.
[0034]
Moreover, in order to strengthen the coupling between the first cylindrical portion 22 and the
second cylindrical portion 23, the second cylindrical portion 23 disposed on the side of the
demagnetizing circuit 12 of the both cylindrical portions 22 and 23 and the unit It is preferable
to provide a locking means for fixing the second cylindrical portion 23 to the unit holder 20 in a
state where a predetermined pressing force is applied to the gasket 28, with the holder 20.
[0035]
In this example, in order to obtain the locking means, the locking hole 201 is bored on the unit
holder 20 side, and the locking hole 201 is fitted on the second cylindrical portion 23 with
elastic deformation. Fixing the second cylindrical portion 23 to the unit holder 20 by so-called
simple one-touch operation of pressing the second cylindrical portion 23 into the unit holder 20
so as to form the claw 233. Can.
[0036]
When sandwiching the gasket 28 between the first cylindrical portion 22 and the second
cylindrical portion 23, an adhesive of organic solvent type may be used in combination as in the
conventional example.
In that case, by providing the locking means (201, 233), it is not necessary to hold down the
second cylindrical portion with a special jig until the adhesive is solidified (dried).
[0037]
In addition, even if the adhesive is fleshed out by evaporation of the organic solvent, the gap of
the fleshed portion is crushed by the pressing force of the locking means (201, 233), so that
good airtightness is ensured. it can.
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Further, by making the gasket 28 a rubber elastic body and providing the locking means (201,
233), the airtightness between the first cylindrical portion 22 and the second cylindrical portion
23 is secured without the adhesive. be able to.
[0038]
As mentioned above, although the principal part of the present invention was explained, the
middle cylinder 30 which has a back air room 30A is further connected to the rear end side of
the unit holder 20 as shown in the imaginary line of FIG. It may be done.
[0039]
Finally, the unit holder 20 is supported in a cylindrical microphone housing (microphone grip)
(not shown) made of aluminum or a brass alloy via a shock mount member (not shown) made of
a rubber elastic body. .
[0040]
Sectional drawing which shows the microphone unit and the unit holder with which the dynamic
microphone of this invention is equipped as a principal part.
The disassembled sectional view of FIG.
Sectional drawing which shows the microphone unit and unit holder with which the conventional
dynamic microphone is equipped as a principal part.
FIG. 4 is an exploded cross-sectional view of FIG.
Explanation of sign
[0041]
DESCRIPTION OF REFERENCE NUMERALS 10 microphone unit 20 unit holder 20 A back air
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chamber (air chamber) 201 locking hole 22 first cylindrical portion 221 sound hole 222 opening
end 25 acoustic resistance material 23 second cylindrical portion 231 sound hole 232 opening
end 233 locking claw 26 Sound Resistant Material 28 Gasket
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