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JP2006019854

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DESCRIPTION JP2006019854
PROBLEM TO BE SOLVED: In a condenser microphone including a microphone unit and an
output module unit connected by a microphone cord, the microphone code in the output module
unit is not interfered with the operation of soldering the microphone code to the circuit board of
the output module unit. Shorten the length to prevent noise generation due to electromagnetic
waves. SOLUTION: In a condenser microphone which connects a condenser microphone unit 10
and an output module unit 20 in which a circuit board 22 is accommodated in a shield case 21
via a microphone cord 30, it can be inserted in and removed from the shield case 21. The
connection fitting 110 for the microphone cord and the output connector 23 which are
detachably fitted in the distal end opening 21a of the shield case 21 are fixed to the circuit board
22 and the connection fitting 110 for the microphone cord is used as the circuit board 22. As
well as being able to be removed from the shield case 21. [Selected figure] Figure 1
コンデンサマイクロホン
[0001]
The present invention relates to a condenser microphone in which a condenser microphone unit
and an output module unit are connected by a dedicated microphone cord, and more particularly,
to a technology for preventing generation of high frequency current due to external
electromagnetic waves in the output module unit. It is.
[0002]
There are many types of condenser microphones according to applications. One of them is tie-pin
microphones that are used by attaching to clothes etc. and gooseneck microphones mainly used
for conferences as described in Patent Document 1 is there.
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1
[0003]
FIGS. 4 and 5 show prior art examples 1 and 2 of a tie pin type microphone, and FIG. 6 shows
prior art example 3 of a gooseneck type microphone.
In each of these drawings, (a) is an exploded view showing a state at the time of assembly work
of the output module part, and (b) is a cross-sectional view showing a state at the completion of
the assembly of the output module part.
[0004]
In these tie pin type and goose neck type condenser microphones, the condenser microphone
unit 10 and the output module unit 20 are separately configured in order to make the presence
of the microphone inconspicuous, and they are connected via the dedicated microphone cord 30
Be done.
[0005]
Among the capacitor microphone unit 10 and the output module unit 20 commonly included in
the first to third conventional examples, the capacitor microphone unit 10 includes the cartridge
case 11 made of, for example, aluminum, and the cartridge case 11 is used as a shield case. The
capacitor unit and the impedance converter which contain the diaphragm and fixed pole which
are not shown in figure are accommodated.
Usually, a FET (field effect transistor) is used for the impedance converter.
[0006]
The output module unit 20 includes a cylindrical shield case 21 made of, for example, a brass
alloy, and the circuit case 22 and the output connector 23 are accommodated in the shield case
21.
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2
Although not shown, an audio output circuit including a transformer, a low cut filter circuit, an
amplifier circuit and the like is mounted on the circuit board 22.
[0007]
The output connector 23 is fixed to one end of the circuit board 22 by screwing or the like, and
is disposed on the rear end side of the shield case 21 as the circuit board 22 is housed in the
shield case 21. The output module unit 20 may be called a power module unit.
[0008]
In the condenser microphone, generally, a 3-pin type output connector defined in EIAJ RC5236
Acceptor latch lock type round connector is used as the output connector 23. That is, the
output connector 23 includes a first pin for grounding (for shielding), a second pin used as a hot
side of a signal, and a third pin used as a cold side of a signal, and a phantom via a balanced
shield cable not shown. Connected to the power supply.
[0009]
Although not shown in detail, in the microphone cord 30, a power supply line for supplying
power to the condenser microphone unit 10, a signal line for transmitting an audio signal output
from the impedance converter to an audio output circuit of the circuit board 22, and these power
supply lines And a two-core shield-covered wire including a shield-covered wire which
electrostatically shields the signal line and is dropped to the ground.
[0010]
Among these, the shield-covered wire is connected to the capsule case 11 on the capacitor
microphone unit 10 side, and is connected to the shield case 21 and a ground circuit (not shown)
of the circuit board 22 on the signal input side of the output module unit 20.
Further, on the signal output side of the output module section 20, the first pin for grounding of
the output connector 23 is connected to the shield case 21 and the grounding circuit of the
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3
circuit board 22 as well as the shield covering wire.
[0011]
When connecting the microphone cord 30 to the circuit board 22 of the output module unit 20,
in the prior art example 1 of FIG. 4, as shown in FIG. 4A, the microphone cord is pulled out from
the shield case 21 as shown in FIG. After forming a retaining ball 31 at one end of the shield case
21 through the inside of the shield case 21, the circuit board 22 is soldered.
[0012]
Thereafter, as shown in FIG. 4 (b), the circuit board 22 is housed in the shield case 21 together
with the output connector 23.
In the prior art 1, a rubber bush 24 acting as a hook of the knot ball 31 is provided on the front
end side of the shield case 21.
[0013]
In Conventional Example 2 of FIG. 5, a cord connector 40 is used to connect the microphone cord
30 and the circuit board 22 of the output module unit 20. That is, one male connector member
41 included in the cord connector 40 is provided on the microphone cord 30 side, and the other
female connector member 42 is attached to the tip end of the shield case 21, and the female
connector member 42 and the circuit board 22 Are connected by the internal code 32.
[0014]
As shown in FIG. 5A, in the actual connection operation, one end of the internal cord 32 is
connected to the female side connector member 42 and then the female side connector member
42 is attached to the distal end side of the shield case 21. The other end is pulled out from the
shield case 21 and soldered to the circuit board 22. Thereafter, as shown in FIG. 5 (b), the circuit
board 22 is accommodated in the shield case 21 together with the output connector 23.
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[0015]
The prior art example 3 of FIG. 6 relates to a goose neck type microphone for supporting the
condenser microphone unit 10 with the flexible pipe 50. In this case, a base for fitting and fixing
the flexible pipe 50 to the tip end of the shield case 21. 25 will be prepared. The microphone
cord 30 is wired in the flexible pipe 50 and pulled out from the fixed end side thereof. A cord
insertion hole 25 a for inserting the microphone cord 30 into the shield case 21 is formed in the
base 25.
[0016]
In prior art example 3, in order to connect the microphone cord 30 to the circuit board 22 of the
output module section 20, as shown in FIG. 6A, the microphone cord 30 is inserted into the
shield case 21 through the cord insertion hole 25a of the base 25. In the inserted state, the fixed
end side of the flexible pipe 50 is fixed, for example, by press fitting into the base 25, and the
microphone cord 30 is soldered to the circuit board 22 outside the shield case 21. Thereafter, as
shown in FIG. 6B, the circuit board 22 is housed together with the output connector 23 in the
shield case 21.
[0017]
Unexamined-Japanese-Patent No. 9-229292
[0018]
Incidentally, when a strong electromagnetic wave is applied to the microphone cord 30, a high
frequency current due to the electromagnetic wave may enter the inside of the shield case 21
and be detected by an audio output circuit formed on the circuit board 22 to generate noise.
[0019]
In recent years, mobile phones are rapidly spreading, but when the mobile phones are used in
the vicinity of a microphone, considerably strong electromagnetic waves (for example, electric
field strength generated in the city by commercial radio waves within a range of several cm to
several 10 cm) In the field of microphones, mobile phone countermeasures are urgently needed
to receive electric field strengths that reach tens of thousands of times.
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[0020]
In particular, when the wiring length in the output module unit 20 of the microphone cord 30 is
long, the portion acts as an antenna, so that it becomes susceptible to the influence of
electromagnetic waves.
Therefore, in order to take measures against electromagnetic waves, it is preferable that the
wiring length in the output module unit 20 of the microphone cord 30 be as short as possible.
However, in the prior art example 1 described above, since the connection ball 31 for retaining is
required in the microphone cord 30, the wiring length in the output module section 20 can not
but be increased accordingly.
[0021]
Further, assuming that the internal cord 32 in the prior art example 2 is included in part of the
microphone cord 30, in the prior art examples 2 and 3 at the time of soldering or maintenance
(repair) the microphone cord 30 to the circuit board 22. Since the wiring length of the
microphone cord 30 in the output module section 20 needs to be longer than the axial length of
the shield case 21, it is necessary to pull out the shield case 21.
Because of this, noise generation due to electromagnetic waves is a particular problem in the
condenser microphones of the embodiments shown in the above-described conventional
examples 1 to 3.
[0022]
Therefore, the subject of the present invention is the soldering and maintenance work of the
microphone cord to the circuit board included in the output module part in the condenser
microphone in which the condenser microphone unit and the output module part are connected
by the dedicated microphone cord. The purpose is to shorten the microphone cord length in the
output module section without causing any problem.
[0023]
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6
In order to solve the above problems, according to the present invention, a capacitor microphone
unit including an impedance converter and a circuit board including an audio output circuit are
housed in a shield case, and an output connector is mounted on the rear end side of the shield
case. A capacitor microphone comprising an output module unit, wherein the capacitor
microphone unit and the output module unit are connected via a microphone cord, the output
connector being attached to one end of the circuit board, and the circuit The connection fitting
for the microphone cord detachably fitted into the tip opening of the shield case is integrally
attached to the other end of the substrate, and the circuit board is the output connector and the
connection fitting. And can be inserted into and removed from the shield case.
[0024]
According to a preferred first aspect of the present invention, a cord insertion hole for pulling out
the microphone cord to the circuit board side and a cord for fixing the microphone cord inserted
in the cord insertion hole in the metal fitting for connection are fixed A fixing means is provided
and applied to a tie pin type microphone.
In this case, the cord fixing means preferably comprises a plastically deformable sleeve which is
coaxial with the cord insertion hole and integrally formed with the connection fitting.
[0025]
Further, according to a preferred second aspect of the present invention, in the case where the
microphone cord is connected to the output module portion via a cord connector, one connector
member of the cord connector is held by the connection fitting. Applied to tie-pin microphones.
[0026]
Further, according to a preferred third aspect of the present invention, the metal fitting for
connection is provided with a cord insertion hole for drawing out the microphone cord to the
circuit board side, and a mouth ring on which one end of a flexible pipe is fitted and fixed. ,
Applied to gooseneck microphones.
[0027]
According to the present invention, the microphone cord length in the output module section can
be increased by attaching the connection fitting for the microphone cord to the circuit board and
making the connection fitting and the circuit board insertable into and removable from the shield
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case. Since it is sufficient to secure only the length required for soldering, noise generation due to
electromagnetic waves can be effectively prevented, and troubles in the soldering work and
maintenance work of the microphone cord to the circuit board can also be achieved. Absent.
[0028]
Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3,
but the present invention is not limited to this.
FIGS. 1 and 2 correspond to the prior art examples 1 and 2 of FIGS. 4 and 5 described in the first
and second embodiments of the tie pin type microphone.
FIG. 3 corresponds to the prior art example 3 of FIG. 6 described above in the third embodiment
of the gooseneck microphone.
[0029]
In the description of the first to third embodiments, the same reference numerals are used for the
components which do not require any particular modification to the conventional examples 1 to
3 described above.
Further, in FIGS. 1 to 3, (a) is an exploded view showing a state at the time of assembling the
output module portion, and (b) is a cross-sectional view showing a state at the completion of the
assembling of the output module portion.
[0030]
The condenser microphone according to the first embodiment of FIG. 1 is a tie pin type
microphone similar to the conventional example 1 of FIG. 4 in which the condenser microphone
unit 10 and the output module unit 20 are connected via the microphone cord 30. Unlike the
prior art example 1, the connection metal fitting 110 for connecting the microphone cord 30 to
the circuit board 22 in the output module unit 20 is provided.
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[0031]
The connection fitting 110 is made of a metal cylindrical body detachably fitted in the tip end
opening 21a of the shield case 21 included in the output module portion 20, and the cord
insertion hole 111 for the microphone cord 30 in its center. Is equipped.
In order to prevent the electromagnetic wave from entering the output module section 20, it is
preferable that the connection fitting 110 be precisely manufactured so as to fit in the tip
opening 21a with almost no gap.
[0032]
In addition, a plastically deformable sleeve 112 coaxial with the cord insertion hole 111 is
integrally formed on the connection fitting 110 as a cord fixing means of the microphone cord
30 so as to protrude on the front side of the connection fitting 110. It is done.
In addition, screwing, a washer clamp, etc. may be employ ¦ adopted as another example of a
cord fixing means.
[0033]
The output connector 23 is fixed to one end of the circuit board 22 by a screw or the like as in
the prior art example 1. However, in the first embodiment, the other end of the connection metal
fitting 110 is also fixed to the circuit board 22 ) And can be inserted into and removed from the
shield case 21 together with the circuit board 22.
[0034]
The connection fitting 110 has two radially threaded screw holes 113 and 114, one of which is
screwed to the circuit board 22 using one of the screw holes 113.
The other screw hole 114 is for fixing to the shield case 21. A rubber bush 24 is attached to the
front side of the connection fitting 110.
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[0035]
In this first embodiment, in order to connect the microphone cord 30 to the circuit board 22 of
the output module unit 20, as shown in FIG. 1A, the circuit board 22 is drawn out from the shield
case 21 and the microphone cord 30 is Are passed through the inside of the shield case 21 and
the cord insertion holes 111 of the connection fitting 110, and one end thereof is drawn onto the
circuit board 22 and soldered.
[0036]
At this time, the rubber bush 24 is removed, the sleeve 112 is crimped, and the microphone cord
30 is fixed to the connection fitting 110.
Therefore, it is not necessary to form the knot ball 31 as in the prior art example 1 on the
microphone cord 30. When the sleeve 112 is crimped, it is preferable to partially remove the
sheath of the crimped portion of the microphone cord 30 to expose the shield coating and
electrically connect it to the connection fitting 110.
[0037]
After completion of the soldering, as shown in FIG. 1B, the circuit board 22 is housed in the
shield case 21 and the connection fitting 110 is fitted in the tip end opening 21a of the shield
case 21 for connection. The metal fitting 110 and the output connector 23 are screwed to the
shield case 21 respectively. As described above, according to the first embodiment, the
microphone cord length in the output module unit 20 may be secured by the length required for
soldering. In addition, maintenance can be easily performed.
[0038]
Next, Example 2 of FIG. 2 will be described. The condenser microphone according to the second
embodiment is a tie pin type microphone similar to that of the prior art example 2 of FIG. 5 in
which the cord connector 40 is used to connect the microphone cord 30 and the circuit board 22
of the output module unit 20. The cord connector 40 for this type of microphone is, for example,
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10
a product number TB3M manufactured by Switchcraft.
[0039]
Also in the second embodiment, for example, one male connector member 41 included in the
cord connector 40 is connected to the microphone cord 30 side, and the other female connector
member 42 is provided on the output module portion 20 side. A point different from Example 2
is that the female connector member 42 is fixed to the circuit board 22 by the connection fitting
120.
[0040]
The connection fitting 120 is made of metal integrally including a cylindrical portion 121 for
holding the female connector member 42 and a base portion 122 disposed on one end side (rear
end side) of the cylindrical portion 121. Is detachably fitted in the distal end opening 21 a of the
shield case 21.
[0041]
When the male side connector member 41 is provided on the side of the output module portion
20, the male side connector member 41 is held in the cylindrical portion 121. In order to prevent
it from entering inside, it is preferable that the cylindrical portion 121 be precisely manufactured
so as to fit in the tip opening 21 a of the shield case 21 with almost no gap.
[0042]
The female connector member 42 is connected to the circuit board 22 via the three lead wires 43
instead of the inner cord 32 in the second prior art, but the three lead wires 43 are provided at
the center of the base portion 122. An insertion hole 123 is formed for inserting the
The internal cord 32 may be cut short and used instead of the three lead wires 43.
[0043]
Further, a screw hole 124 is bored in the base portion 122 along the radial direction, and the
connection fitting 120 is fixed to the circuit board 22 using the screw hole 124.
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The fixing position of the connection fitting 120 to the circuit board 22 is a side facing the
output connector 23 as in the connection fitting 110 in the first embodiment.
Although a screw hole 125 is also formed in the cylindrical portion 121, this is for fixing to the
shield case 21.
[0044]
According to the second embodiment, as shown in FIG. 2A, the female connector member 42 to
which the lead wire 43 is connected in advance is fitted to the cylindrical portion 121 of the
connection fitting 120 and the lead wire 43 is inserted into the insertion hole 123 And may be
pulled out onto the circuit board 22 and soldered.
[0045]
Then, as shown in FIG. 2 (b), with the circuit board 22 housed in the shield case 21 and the
connection fitting 120 fitted in the tip end opening 21 a of the shield case 21, the connection
fitting 120 is And screwing the output connector 23 to the shield case 21 completes the
assembly.
[0046]
As described above, in the second embodiment as well as the first embodiment, the wiring length
of the lead wire 43 in the output module unit 20 may be secured by the length required for the
soldering.
In addition, maintenance can be easily performed.
[0047]
Next, Example 3 of FIG. 3 will be described.
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The condenser microphone of the third embodiment is a goose neck type microphone supporting
the condenser microphone unit 10 by the flexible pipe 50 as in the conventional example 3 of
FIG. 6, but the metal fitting 130 for the flexible pipe 50 is a circuit board 22 It differs from the
prior art 3 in that it is provided on the side.
[0048]
The connection fitting 130 is formed of a metal cylinder detachably fitted in the tip end opening
21a of the shield case 21 and integrally includes a base 131 into which the fixed end side of the
flexible pipe 50 is fitted. A cord insertion hole 132 for the microphone cord 30 is bored in the
center. In order to prevent electromagnetic waves from entering the output module section 20, it
is preferable that the base 131 be precisely manufactured so as to fit in the tip opening 21a with
almost no gap.
[0049]
Further, two screw holes 133 and 134 are bored in the connection fitting 130 along the radial
direction, and the connection fitting 130 is fixed to the circuit board 22 using the one screw hole
133. The fixing position of the connection fitting 130 to the circuit board 22 is a side facing the
output connector 23 as in the connection fittings 110 and 120 in the first and second
embodiments. The other screw hole 134 is for fixing to the shield case 21.
[0050]
In this third embodiment, in order to connect the microphone cord 30 to the circuit board 22 of
the output module section 20, as shown in FIG. 3A, the flexible pipe 50 is pulled out with the
circuit board 22 pulled out from the shield case 21. Is inserted into the shield case 21 and the
fixed end of the flexible pipe 50 is fitted and fixed in the base 131 while inserting the
microphone cord 30 drawn out of the flexible pipe 50 into the cord insertion hole 132.
[0051]
Then, the end of the microphone cord 30 drawn out from the cord insertion hole 132 onto the
circuit board 22 is soldered to the circuit board 22, and then the circuit board 22 is placed in the
shield case 21 as shown in FIG. With the connection fitting 130 fitted in the distal end opening
21 a of the shield case 21, the connection fitting 130 and the output connector 23 are screwed
to the shield case 21.
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[0052]
As described above, also in the third embodiment, the microphone cord length in the output
module unit 20 may be secured by the length required for the soldering.
Therefore, since the portion to be the antenna in the output module unit 20 is eliminated, the
high frequency current due to the electromagnetic wave does not flow into the output module
unit 20 and the noise generation can be prevented.
In addition, since the operation as the microphone can be confirmed even in the state where the
shield case 21 is removed, assembly and repair can be easily performed.
[0053]
(A) An exploded view showing an output module part in Example 1 of the present invention, (b) is
a sectional view showing a state when the assembly of the output module part is completed. (A)
An exploded view showing an output module part in Example 2 of the present invention, (b) is a
sectional view showing a state at the completion of the assembly of the output module part. (A)
An exploded view showing an output module part in Example 3 of the present invention, (b) is a
sectional view showing a state at the completion of the assembly of the output module part. (A)
Exploded view showing the output module section in the conventional example 1, (b) is a
sectional view showing a state when the assembly of the output module section is completed. (A)
Exploded view showing an output module part in the prior art example 2, (b) is a cross-sectional
view showing a state when the assembly of the output module part is completed. (A) Exploded
view showing an output module part in the prior art example 3, (b) is a sectional view showing a
state when the assembly of the output module part is completed.
Explanation of sign
[0054]
DESCRIPTION OF SYMBOLS 10 capacitor microphone unit 20 output module part 21 shield case
21a tip opening 22 circuit board 23 output connector 30 microphone cord 40 cord connector 50
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flexible pipe 110, 120, 130 connection fitting 112 sleeve 121 cylindrical part 131 base
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