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JP2011019087

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DESCRIPTION JP2011019087
A condenser microphone in which a capsule part is replaceable in a microphone body, and ferrite
beads can be incorporated with good workability into the microphone body side. A capsule body
(10) comprising: a microphone body (20) having an electronic circuit including an impedance
converter; and a capsule portion (10) having an electrostatic type acoustoelectric converter (12)
and detachably connected to the microphone body (20). The first connection terminal portion 14
for the acoustoelectric transducer 12 is disposed substantially at the center of the connection
end side of the microphone, and the electrically insulating support base 22 is provided at the
connection end side of the microphone main body 20. A second connection terminal 25 for the
electronic circuit is disposed substantially at the center of the platform 22, and along with the
connection of the capsule unit 10 to the microphone body 20, the first connection terminal 14
and the second connection terminal 25 The ferrite bead 26 is disposed around the second
connection terminal 25 in the condenser microphone in which the two contact each other.
[Selected figure] Figure 2
コンデンサマイクロホン
[0001]
The present invention relates to a condenser microphone capable of appropriately replacing a
capsule unit with a microphone body according to a desired directivity, and more particularly to
an electromagnetic shielding technique at a connecting portion thereof.
[0002]
01-05-2019
1
The condenser microphone incorporates an electronic circuit including an impedance converter
in the microphone since the impedance of the electrostatic type acoustoelectric converter
included in the microphone unit is extremely high.
An FET (field effect transistor) is usually used for the impedance converter.
[0003]
Therefore, when a high frequency current due to an external electromagnetic wave (in particular,
an electromagnetic wave emitted from a mobile phone) is added to the electronic circuit, it may
be detected by an impedance converter (FET) to generate audio frequency noise.
[0004]
Although this problem is solved by ensuring the shielding of the microphone case, for example,
in a model in which the capsule unit (microphone unit) is replaceable with respect to the
microphone main body as described in Patent Document 1, Since the electrical connection is
made at the mechanically coupled portion, the high frequency current is easily introduced into
the microphone housing from the coupling portion.
[0005]
By attaching a ferrite bead to the gate of the FET, it is possible to prevent the flow of high
frequency current into the FET.
[0006]
Japanese Patent Application Publication No. 2007-28027
[0007]
However, attaching a ferrite bead to the gate of the FET not only takes time for assembly work,
but also because the gate part of the FET has a high impedance, vibration noise occurs when the
ferrite bead is mechanically vibrated, Insufficient electrical insulation may cause leakage noise.
[0008]
In addition, since the gate of the FET directly affects the sound quality, it is better not to have a
ferrite bead in an environment where noise due to high frequency current does not occur.
01-05-2019
2
[0009]
Therefore, an object of the present invention is to provide a condenser microphone in which the
capsule part is replaceable with respect to the microphone main body, and ferrite beads can be
detachably incorporated on the microphone main body with good workability.
[0010]
In order to solve the above problems, the present invention includes a microphone body having
an electronic circuit including an impedance converter, and a capsule unit having an electrostatic
type acoustoelectric transducer and detachably connected to the microphone body. A first
connection terminal for the acoustoelectric transducer is disposed substantially at the center of
the connection end of the capsule unit, and an electrically insulating support base is provided at
the connection end of the microphone body. A second connection terminal for the electronic
circuit is disposed substantially at the center of the support base, and the first connection
terminal and the second connection terminal are connected with the connection of the capsule
unit to the microphone main body. In the condenser microphone in which the part and the part
are in contact with each other, ferrite beads are arranged around the second connection terminal
part.
[0011]
According to a preferred aspect of the present invention, the support base is formed with a
storage groove in which the ferrite bead is removably stored.
[0012]
In addition, it has an elastic body which acts on the ferrite bead elastically and prevents the
vibration of the ferrite bead in the storage groove.
[0013]
Further, it is preferable that the elastic body is formed of a cushion pad formed in an annular
shape, and is provided on the groove bottom of the storage groove and / or on the connection
end side of the capsule portion.
[0014]
According to the present invention, the ferrite bead is disposed around the second connection
terminal portion included in the signal path from the acoustoelectric converter of the capsule
portion to the electronic circuit of the microphone main body, thereby causing the extraneous
01-05-2019
3
electromagnetic wave. The high-frequency current can be prevented from flowing into the
electronic circuit, and the ferrite bead can be incorporated into the microphone body with good
workability.
[0015]
In addition, by forming a storage groove in the support base on which the ferrite bead is
removably stored, the ferrite bead is reliably insulated from the second connection terminal
portion, so that not only leakage noise does not occur, Under circumstances where noise due to
high frequency current does not occur, the ferrite bead can be easily removed.
[0016]
Further, by providing an elastic body that elastically acts on the ferrite bead to prevent the
vibration of the ferrite bead in the storage groove, vibration noise due to the vibration of the
ferrite bead can be eliminated.
[0017]
Sectional drawing which shows the assembly state of the condenser microphone of this
invention.
Sectional drawing which isolate | separates and shows the capsule part and microphone body
which are included in this invention.
[0018]
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.
[0019]
With reference to FIGS. 1 and 2, the present invention is a condenser microphone which
comprises a microphone capsule (capsule portion) 10 and a microphone body 20, and can
replace the microphone capsule 10 according to the desired directivity. is there.
[0020]
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The microphone capsule 10 includes a capsule casing 11 made of a metal cylinder.
Since the microphone capsule 10 is unidirectional, the capsule casing 11 is provided with a front
acoustic terminal 111 and a rear acoustic terminal 112.
[0021]
In the capsule housing 11, an electrostatic type acoustoelectric converter 12 is housed.
The acoustoelectric transducer 12 may be a transducer formed by opposingly arranging a
diaphragm tensioned to a diaphragm ring and a fixed electrode supported by an insulating seat
via a separator ring.
[0022]
An external thread 113 as one connecting means is formed on the outer periphery of the capsule
casing 11 on the connection end 11 a side.
In addition, a sealing member 13 is provided at an opening on the connection end 11 a side of
the capsule casing 11.
[0023]
A conductive contact pin (first connection terminal portion) 14 is provided at approximately the
center of the sealing member 13 so as to be movable back and forth.
In this embodiment, the sealing member 13 is provided with first and second two sealing plates
131 and 132, and a spring storage portion 133 is formed on the mating surface.
01-05-2019
5
[0024]
In the spring accommodating portion 133, a compression coil spring 141 is accommodated
which biases the conductive contact pin 14 in the direction of pushing the conductive contact pin
14 toward the microphone main body 20 side.
In addition, on the inner first sealing plate 131, a relay pin 142, which is disposed in the spring
storage portion 133 at one end and contacts the compression coil spring 141, is implanted.
[0025]
The other end of the relay pin 142 is electrically connected to the fixed pole in the
acoustoelectric converter 12 via a predetermined wiring member 143.
Therefore, the conductive contact pin 14 is electrically connected to the fixed pole via the
compression coil spring 141, the relay pin 142 and the wiring member 143, and acts as a lead
electrode of the fixed pole.
[0026]
When the conductive contact pin 14 itself is a conductive contact pin with a compression coil
spring, the sealing member 13 is a single sealing plate, and the conductive contact pin with a
compression coil spring is inserted through the sealing member 13. May be
[0027]
The microphone body 20 is also referred to as an output module portion, an audio signal output
portion, or a preamplifier portion, and includes a cylindrical microphone housing 21 made of a
metal material such as brass alloy.
[0028]
On the side of the connection end 21 a of the microphone housing 21, a female screw 211 is
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6
formed as the other connecting means to be a counterpart of the male screw 113.
An electrically insulating support base 22 is provided at a position deeper than the female screw
211 on the connection end 21 a side of the microphone housing 21.
[0029]
An output connector 23 is attached to the rear end side (opposite to the connecting end 21 a) of
the microphone housing 21.
For the output connector 23, a 3-pin type output connector defined in EIAJ RC-5236 "Acoustic
equipment latch lock circular connector" is preferably used.
[0030]
A circuit board 24 is supported between the support base 22 and the output connector 23.
Although not shown, the circuit board 24 is provided with an electronic circuit including an FET
(field effect transistor) as an impedance converter, a low cut circuit and the like, and an output
transformer and the like are also mounted.
[0031]
At substantially the center of the support base 22, a terminal pin (second connection terminal
portion) 25 which is a counterpart of the conductive contact pin 14 is provided.
The terminal pin 25 is connected to the gate of the FET via a lead wiring (not shown).
[0032]
Thereby, when the microphone capsule 10 is connected to the microphone body 20, the fixed
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7
pole of the acoustoelectric converter 12 is connected to the gate of the FET through the signal
path including the conductive contact pin 14 and the terminal pin 25.
[0033]
In the present invention, the ferrite bead 26 is disposed around the terminal pin 25 in order to
prevent the high frequency current caused by the external electromagnetic wave entering from
the connection portion from flowing into the gate of the FET through the signal path.
[0034]
In this case, it is preferable that the accommodation groove 221 of the ferrite bead 26 be formed
in the support base 22 and the ferrite bead 26 be detachably accommodated in the
accommodation groove 221.
[0035]
According to this, since the terminal pin 25 and the ferrite bead 26 are surely insulated, not only
the leakage noise does not occur but also the ferrite bead can be easily made in the environment
where the noise due to the high frequency current does not occur. It can be removed.
[0036]
In addition, at the time of connection shown in FIG. 1, the ferrite bead 26 is pressed by the
sealing member 13 of the microphone capsule 10, but in order to more effectively prevent
mechanical vibration, the groove bottom of the storage groove 221 has, for example, It is
preferable to arrange the formed cushion pad (elastic body) 222.
[0037]
The cushion pad 222 may be provided on the sealing member 13 side of the microphone capsule
10 or may be provided on both the groove bottom of the storage groove 221 and the sealing
member 13.
According to this, vibration noise due to mechanical vibration of the ferrite bead 26 can be
reliably prevented.
01-05-2019
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[0038]
The material of the ferrite bead 26 is preferably Mn-Zn ferrite, Ni-Zn ferrite, carbonyl iron dust
or the like, but since the cutoff frequency differs depending on the material of the ferrite bead
26, several types of ferrite beads 26 of different materials are prepared. It is good to be able to
select suitably.
[0039]
As another embodiment, the conductive contact pin 14 may be on the side of the microphone
body 20, and the terminal pin 25 may be on the microphone capsule 10.
Further, the microphone body 20 does not necessarily have to include the output connector 30,
and may be in a form described in, for example, Patent Document 1.
[0040]
DESCRIPTION OF REFERENCE NUMERALS 10 microphone capsule 11 capsule housing 111 front
acoustic terminal 112 rear acoustic terminal 113 male screw 12 acoustoelectric converter 13
sealing member 131, 132 sealing plate 14 conductive contact pin 20 microphone main body 21
microphone housing 211 female screw 22 support base 221 Storage groove 222 Cushion pad 23
Output connector 24 Circuit board 26 Ferrite bead
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