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DESCRIPTION JP2005184347

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DESCRIPTION JP2005184347
PROBLEM TO BE SOLVED: To adjust acoustic resistance in an assembled state in a variable
directional condenser microphone in which two condenser elements respectively including a
diaphragm and a fixed pole are combined. SOLUTION: Diaphragm supporting members 12a and
12b in which diaphragms 11a and 11b are stretched, spacer rings 13a and 13b, fixed poles 14a
and 14b having through holes 141, and insulating seats 15a having a through hole 152 at the
center A variable directional condenser microphone in which capacitor elements 10a and 10b,
which are integrally assembled by ring-shaped cases 16a and 16b in this order, are coupled via a
coupling ring 22 having female screws 221 with insulating seats 15a and 15b back to back. In
the above, the elastic resistance material 31 having elasticity is disposed between the insulating
seats 15a and 15b. [Selected figure] Figure 2
Variable directional condenser microphone
[0001]
The present invention relates to a variable directional capacitor microphone, and more
particularly to a variable directional capacitor microphone formed by combining two capacitor
elements each including a diaphragm and a fixed pole.
[0002]
In Patent Document 1, two capacitor elements each including a diaphragm and a fixed pole are
combined, and part of the sound pressure applied to one (rear) diaphragm is the back surface of
the other (forward) diaphragm A variable directional condenser microphone is disclosed which is
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adapted to be added to
The configuration will be described with reference to the cross sectional view in the assembled
state of FIG. 3 and the exploded cross sectional view of FIG.
[0003]
The variable directional capacitor microphone includes two capacitor elements, a first capacitor
element 10a and a second capacitor element 10b. Since each capacitor element 10a, 10b has the
same configuration, the first capacitor element 10a will be described here, and the corresponding
component of the second capacitor element 10b will be indicated by the subscript b.
[0004]
In the first capacitor element 10a, the diaphragm support member 12a stretched in a state where
the diaphragm 11a is applied with a predetermined tension, the spacer ring 13a, the fixed
electrode 14a and the insulating seat 15a are ringed in this order by the electrically insulating
material It is incorporated in the case 16a formed in the shape of a letter.
[0005]
In this case, the case 16a includes an inner edge flange 161 engaged with the peripheral edge of
the diaphragm support member 12a and a female screw 162 formed on the inner surface of the
body, and the female screw 162 and the female screw are screwed on the outer peripheral
surface of the insulating seat 15a. A mating male screw 151 is formed.
Therefore, by screwing the insulating seat 15a into the case 16a, the diaphragm 11a and the
fixed electrode 14a are firmly fixed in a state of facing each other through the spacer ring 13a.
[0006]
An electrode rod 121 is drawn out from the diaphragm support member 12a. Although only one
is shown in FIGS. 3 and 4, a large number of through holes 141 are formed in the fixed pole 14a.
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The insulating seat 15a is in the form of a bowl whose peripheral edge is raised to form an air
chamber of a predetermined volume with the fixed pole 14a, and a through hole 152 is formed
at the center of the bottom of the insulating seat 15a. ing. Both surfaces of the through hole 152
are covered with, for example, two acoustic resistance members 17a and 18a made of nylon
mesh.
[0007]
The first capacitor element 10a and the second capacitor element 10b have their insulating seats
15a and 15b back to back, and a connection ring 21 having a female screw 221 with the donutshaped gasket 21 disposed therebetween. Mutually coupled.
[0008]
That is, by screwing in the male screw 151 of the insulating seat 15a from one end side of the
coupling ring 21 and screwing the male screw 151 of the insulating seat 15b from the other end
side of the coupling ring 21, the capacitor elements 10a and 10b are connected via the coupling
ring 21. And are mutually coupled.
[0009]
According to this, the first air chamber A1 is formed between the fixed electrode 14a on the first
capacitor element 10a side and the insulating seat 15a, and the second air chamber A2 is formed
between the acoustic resistance members 17a and 18a. The space between the insulators 15a
and 15b is the space between the third air chamber A3 and the second capacitor element 10b,
the space between the acoustic resistance members 17b and 18b is the space between the fourth
air chamber A4, the fixed pole 14b and the insulation seat 15b The back surface side of the
diaphragm 14a and the back surface side of the diaphragm 14b are in acoustic communication
via the acoustic capacity connected in a ladder shape by the five air chambers A5.
[0010]
According to the conventional example of the above configuration, since the first capacitor
element 10a and the second capacitor element 10b can be operated independently before
coupling, the entire configuration can be achieved by selecting and combining capacitor elements
having similar specifications. It is possible to obtain a microphone with stable characteristics.
[0011]
Patent No. 3299829
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[0012]
The variable directional condenser microphone according to the above-described conventional
example is required to have cardioid directivity with good outputs when assembled into any of
the condenser elements 10a and 10b.
[0013]
Therefore, as described above, the acoustic resistances of the capacitor elements 10a and 10b
are adjusted in advance so as to become predetermined values and then the capacitor elements
10a and 10b are coupled. However, they are still satisfactory after assembly The desired
characteristics may not be obtained.
[0014]
In that case, although the acoustic resistance is to be adjusted again, since the acoustic resistance
can not be adjusted in the as-assembled state in the above-described conventional example, the
coupling ring 21 is removed and the respective capacitor elements 10a and 10b are
disassembled to obtain the acoustic resistance. I have to adjust it again.
Moreover, the adjustment may not be completed once.
[0015]
Therefore, it is an object of the present invention to be able to adjust the acoustic resistance in
the as-assembled state in a variable directional condenser microphone formed by combining two
condenser elements each including a diaphragm and a fixed pole. It is to do.
[0016]
In order to solve the above problems, the present invention provides a first diaphragm support
member on which a first diaphragm is stretched, a first spacer ring, a first fixed pole having a
through hole, and a first insulation having a through hole at the center The seat has a first
capacitor element integrally assembled by a ring-shaped first case in this order, a second
diaphragm support member on which a second diaphragm is stretched, a second spacer ring, and
a through hole A second fixed pole and a second insulating element having a through hole at the
center, including a second capacitor element integrally assembled by the ring-shaped second
case in this order; In a variable directional condenser microphone in which a condenser element
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is coupled via a connection ring having a female screw with the first insulating seat and the
second insulating seat back to back. Between the first insulation cylinder and said second
insulating seat, acoustic resistance member having elasticity at positions corresponding to the
through holes are bored in their center are characterized in that they are disposed.
[0017]
In the present invention, around the acoustic resistance material provided between the first
insulating seat and the second insulating seat, elasticity made of a rubber material or the like is
used to prevent sound leakage through the acoustic resistance material. It is preferable that the
gasket which has is arrange | positioned.
[0018]
In this case, in order to increase the degree of freedom of the amount of compression of the
acoustic resistance material regardless of the amount of compression of the gasket, it is possible
to increase the degree of freedom of the amount of compression around the through holes of the
first insulating seat and the second insulating seat. Preferably, a groove having a predetermined
depth for receiving a part of the periphery of the acoustic resistance material is formed.
[0019]
Moreover, the aspect by which the through-hole of the said insulating seat is further covered
with mesh-like acoustic resistance material is also included in this invention.
[0020]
According to the present invention, the amount of compression of the elastic acoustic resistance
material is varied according to the degree of tightening of each insulating seat with respect to the
connection ring, and accordingly, the acoustic resistance value can be adjusted.
Therefore, it is possible to adjust the acoustic resistance so that good directivity can be obtained
while each capacitor element is coupled (assembled) through the coupling ring.
[0021]
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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 sectional view in the assembled state corresponding to FIG. 3 above, and FIG. 2 is an
exploded sectional view corresponding to FIG. 4 above. The same reference numerals are used
for components that may be used.
[0022]
The variable directional capacitor microphone according to the present invention comprises, as
its basic configuration, a first capacitor element 10a and a second capacitor element 10b coupled
via a coupling ring 22.
Since the first capacitor element 10a and the second capacitor element 10b have the same
configuration as described in the above-described conventional example, the first capacitor
element 10a will be mainly described. Here, corresponding components of the second capacitor
element 10b are described. The reference symbols are indicated in parentheses for.
[0023]
That is, in the capacitor element 10a (10b), the diaphragm support member 12a (12b), the
spacer ring 13a (13b), and the fixed pole 14a (13b), in which the diaphragm 11a (11b) is
stretched under a predetermined tension. 14b) and the insulating seat 15a (15b) are
incorporated in this order into a case 16a (16b) formed in a ring shape by an electrically
insulating material.
[0024]
In this case, the case 16a (16b) includes an inner edge flange 161 engaged with the peripheral
edge of the diaphragm support member 12a (12b) and a female screw 162 formed on the inner
surface of the body, and the outer periphery of the insulating seat 15a (15b) An external thread
151 is formed on the surface to be engaged with the internal thread 162.
Therefore, by screwing the insulating seat 15a (15b) into the case 16a (16b), the diaphragm 11a
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(11b) and the fixed electrode 14a (14b) are firmly opposed to each other through the spacer ring
13a (13b). It is fixed.
[0025]
Electrode rods 121 are respectively drawn out from the diaphragm support member 12a (12b).
Although only one is shown in FIGS. 1 and 2, a large number of through holes 141 are formed in
the fixed pole 14a (14b).
The insulating seat 15a (15b) is formed in the shape of a bowl whose peripheral portion is raised
so that an air chamber of a predetermined volume is formed between the insulating pole 15a
(14b) and the insulating pole 15a (15b). A hole 152 is drilled.
[0026]
The first capacitor element 10a and the second capacitor element 10b having the configuration
described above are mutually engaged by screwing the male screws 151 and 151 with the
female screw 221 of the connection ring 21 with the insulating seats 15a and 15b back to back.
At this time, an acoustic resistance material 31 having a diameter larger than that of the through
hole 152 is coaxially disposed between the insulating seat 15a and the insulating seat 15b.
That is, the through holes 152 of the insulating seats 15 a and 15 b are covered with the acoustic
resistance material 31.
[0027]
The acoustic resistance material 31 is made of an elastic body having sponge-like open cells
whose acoustic resistance value changes depending on the amount of compression. As such an
acoustic resistance material, there is, for example, a urethane sponge product number HR50
manufactured by Bridgestone Corporation.
[0028]
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The acoustic resistance material 31 may be disposed over the entire surface between the
insulating seats 15a and 15b, but in order to prevent sound leakage through the acoustic
resistance material 31, elasticity made of, for example, a rubber material is provided around the
acoustic resistance material 31. Preferably, a gasket 32 is provided.
[0029]
According to this configuration, the compression amount of the acoustic resistance member 31,
that is, the acoustic resistance value can be made variable by the screw amount of the insulating
seats 15a and 15b with respect to the connection ring 21, so the first capacitor element 10a and
the second capacitor element In the assembled state of 10b, the acoustic resistance value
between the diaphragm 11a and the diaphragm 11b can be adjusted.
[0030]
When the gasket 32 is arranged around the acoustic resistance material 31, the gasket 32 is
harder than the acoustic resistance material 31. Therefore, when the gasket 32 is strongly
tightened, the acoustic resistance material 31 also has the same thickness as the gasket 32. And
the sound resistance value may not be obtained properly.
[0031]
In order to eliminate this relationship and increase the degree of freedom of the amount of
compression of the acoustic resistance member 31, as shown in FIG. 2, a predetermined diameter
of the acoustic resistance member 31 is received around the through holes 152 of the insulating
seats 15a and 15b. A groove 153 with a depth may be formed.
The groove 153 can also be used as a means for positioning the acoustic resistance material 31.
[0032]
Although not shown in FIGS. 1 and 2, an acoustic resistance material made of, for example, a
nylon mesh as described in the above-described conventional example may be provided on both
sides (or one side) of the through hole 152. Such embodiments are also included in the present
invention.
[0033]
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Sectional drawing at the time of the assembly of the variable directivity capacitor | condenser
microphone by this invention.
FIG. 2 is an exploded cross-sectional view of a variable directional capacitor microphone
according to the present invention.
Sectional drawing at the time of the assembly of the conventional variable directivity capacitor |
condenser microphone.
The disassembled sectional view of the conventional variable directivity condenser microphone.
Explanation of sign
[0034]
DESCRIPTION OF SYMBOLS 10a 1st capacitor | condenser element 10b 2nd capacitor |
condenser element 11a, 11b Diaphragm 12a, 12b Diaphragm support member 13a, 13b Spacer
ring 14a, 14b Fixing pole 15a, 15b Insulating seat 16a, 16b Case 121 Electrode rod 22
Connection ring 31 Elasticity Sound Resistant Material 32 Gaskets with
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