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JP2012060490

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DESCRIPTION JP2012060490
PROBLEM TO BE SOLVED: To prevent both noise generation due to an external electromagnetic
wave and noise generation due to discharge at the time of a tentacle in a gooseneck microphone.
A metal outer cylindrical body (21) having one end fixed to a support tube (30) and the other end
connected to a unit case (11) of a microphone unit in a unit holder (20) to which the microphone
unit (10) is connected The circuit board 23 is disposed in the body 21 and electrically connected
to the shield-covered wire 43 of the microphone cable 40 at one end, and is electrically
connected to the ground pattern 231 of the circuit board 23 at the other end. A first electrostatic
shield system extending from the unit case 11 through the outer cylinder 21 to the support tube
30 and the ground pattern 231 of the circuit board 23 through the inner cylinder 22. A cover
portion made of a synthetic resin formed in a cylindrical shape which has a double shield by a
second electrostatic shield system leading to the shield-covered wire 43 and covers the outer
cylinder 21 Equipped with a 25. [Selected figure] Figure 1
Gooseneck microphone
[0001]
The present invention relates to a gooseneck microphone in which a microphone unit is provided
on the distal end side of a flexible support tube including a flexible shaft, and more specifically,
noise generation due to extraneous electromagnetic waves and discharge due to tentacles The
present invention relates to a technique for preventing both noise generation.
[0002]
In the goose neck type microphone, the microphone unit is provided on the distal end side of the
flexible support tube including the flexible shaft, and the microphone unit can be easily brought
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close to the speaker's mouth, so it is preferably adopted for a meeting etc. It is done.
[0003]
In a gooseneck microphone, a condenser microphone unit is generally used as the microphone
unit.
In the case of the condenser microphone unit, since the impedance of the electrostatic
acoustoelectric converter in which the diaphragm and the fixed pole are disposed to face each
other is high, the impedance microphone is provided with an impedance converter made of a FET
(field effect transistor).
[0004]
By the way, in recent years, mobile phones are used everywhere, and may be used on conference
seats.
Although not recognized very much, mobile phones emit considerably strong electromagnetic
waves (in the range of several centimeters to several tens of centimeters, field strengths
comparable to tens of thousands of field strengths generated in the market by commercial power
sources) .
[0005]
Therefore, when the portable telephone is used near the condenser microphone unit, a high
frequency current due to the electromagnetic wave may enter the unit. Then, the high frequency
current is detected by the impedance converter in the unit, and a noise signal resulting therefrom
is superimposed on the voice signal and output from the microphone.
[0006]
Therefore, in the invention described in Patent Document 1, the unit case of the condenser
microphone unit is electrically connected to a support pipe (both made of metal) and grounded,
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and a shield cup is provided in the unit case, and the shield cup is The microphone cable is drawn
in, the shield sheath of the microphone cable is electrically connected to the shield cup, and the
impedance converter etc. is housed in the shield cup.
[0007]
According to this, since the unit case is grounded via the support tube and the unit case is
electrically connected to the shield coating of the microphone cable, noise generation due to the
external electromagnetic wave radiated from the portable telephone etc. is prevented can do.
[0008]
JP, 2008-153815, A
[0009]
However, noises output from the microphone include noise due to discharge at the time of the
tentacle in addition to noise due to extraneous electromagnetic waves.
[0010]
That is, when the speaker touches the microphone unit in order to bring the microphone unit
close to the mouth, spark discharge occurs when the potential difference between the speaker
and the microphone unit exceeds the breakdown electric field of air, thereby the microphone
Noise is output from.
In addition, even if spark discharge does not occur, noise may be output from the microphone as
well if rapid movement of charge occurs between the speaker and the microphone unit.
[0011]
In order to prevent the noise generation due to the discharge at the time of the tentacle, the unit
case may be made of a material whose charge does not move rapidly, for example, a polymer
material (plastic) having a high volume resistivity. The continuity of the electrostatic shield is
interrupted at the part of (b), and there is a possibility that the high frequency current due to the
external electromagnetic wave may enter the unit case from that part.
01-05-2019
3
[0012]
Therefore, an object of the present invention is to provide a gooseneck microphone having a
configuration capable of preventing both noise generation due to an external electromagnetic
wave and noise generation due to discharge at the time of a tentacle.
[0013]
In order to solve the above problems, the present invention is electrically connected to a
microphone unit formed by housing an electrostatic type acoustoelectric converter in a metal
unit case, and the output side of the acoustoelectric converter. A unit holder having a circuit
board on which an impedance converter is mounted, and a flexible metal supporting tube, the
unit holder being supported at one end of the supporting tube, and the microphone unit being
mounted on the unit holder A gooseneck microphone in which a microphone cable consisting of
a two-core shielded cable is inserted into the support tube and one end thereof is pulled into the
unit holder. The unit holder has one end electrically connected to the support tube. Is fixed with
mechanical connection, and the other end is electrically connected with the unit case of the
microphone unit. A cylindrical outer cylinder made of a metallic material to be joined and the
outer cylinder are disposed, one end side of the cylindrical outer cylinder is fixed to the shield
coating wire of the microphone cable with electrical connection, and the other side is the circuit
board A cylindrical inner cylinder made of a metal material disposed and electrically connected
to the ground pattern of the circuit board, and a cylindrically formed synthetic resin cover
member covering the outer cylinder; A first electrostatic shield system extending from the unit
case through the outer cylinder to the support tube; and a second electrostatic shield system
extending from the ground pattern of the circuit board through the inner cylinder to the shieldcovered wire It is characterized by being equipped.
[0014]
In the present invention, the outer cylinder integrally includes a large diameter cylindrical
portion connected to the unit case and a small diameter cylindrical portion fixed to the support
pipe, and the inner cylinder is provided with the circuit board. And the small diameter cylindrical
portion fixed to the shield covering wire, the outer diameter of the large diameter cylindrical
portion of the inner cylindrical body is substantially the same as the inner diameter of the large
diameter cylindrical portion of the outer cylindrical body. Preferably, the inner cylinder has the
same diameter and is coaxially supported in the outer cylinder.
[0015]
According to the present invention, in the unit holder to which the microphone unit is connected,
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one end side is fixed to the support tube with the electrical connection, and the other end side is
connected with the unit case of the microphone unit with the electrical connection. A cylindrical
outer cylinder made of a material and coaxially disposed in the outer cylinder in contact with the
outer cylinder, one end of which is fixed to the shield coating wire of the microphone cable with
electrical connection, and the other end And a cylindrical inner cylinder made of a metal material
electrically connected to the ground pattern of the circuit substrate, and a first electrostatic from
the unit case through the outer cylinder to the support tube A microphone by including a shield
system (mainly a high frequency system) and a second electrostatic shield system (mainly a low
frequency system) extending from the ground pattern of the circuit board through the inner
cylinder to the shield coated wire The flow of high frequency current due to the external
electromagnetic waves to can be reliably prevented.
In addition, since the unit holder to be touched by the speaker is covered with a synthetic resin
cover member which is a member with high volume resistivity, the movement of the charge at
the time of the touch becomes slow, and the noise at the time of the touch is noise It can also
prevent the occurrence.
[0016]
Further, the outer cylinder integrally includes a large diameter cylindrical portion connected to
the unit case and a small diameter cylindrical portion fixed to the support pipe, and the inner
cylinder is a large diameter cylindrical portion on which the circuit board is disposed The small
diameter cylindrical portion fixed to the shield covering wire is integrally formed, and the outer
diameter of the large diameter cylindrical portion of the inner cylindrical body is substantially
the same diameter as the inner diameter of the large diameter cylindrical portion of the outer
cylindrical body Since the inner cylinder is coaxially supported in the outer cylinder, the inner
cylinder can be easily incorporated in the outer cylinder without rattling.
[0017]
FIG. 2 is an exploded cross-sectional view of the main part of the gooseneck microphone
according to the present invention.
Sectional drawing which shows the assembly state of the said principal part.
[0018]
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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.
[0019]
With reference to FIGS. 1 and 2, the gooseneck microphone according to this embodiment
basically includes a microphone unit 10, a unit holder (microphone body) 20, and a support tube
30 having flexibility. A microphone cable 40 inserted into the support tube 30 and a connection
ring 50 for detachably connecting the microphone unit 10 and the unit holder 20 are provided.
[0020]
The microphone unit 10 is a condenser microphone unit formed by housing the electrostatic type
acoustoelectric converter 12 in a unit case 11.
The unit case 11 is cylindrical and made of a metal material such as aluminum or a brass alloy.
[0021]
In this embodiment, since the microphone unit 10 is unidirectional, the front acoustic terminal
111 is bored on the front end wall of the unit case 11, and on the rear end side of the peripheral
surface of the unit case 11, A rear acoustic terminal 112 is provided.
Further, on the inner peripheral surface of the unit case 11, a female screw 113 for connection is
formed.
[0022]
The electrostatic type acoustoelectric converter 12 includes a diaphragm 121 and a fixed
electrode 123, which are disposed opposite to each other with a slight air gap interposed
between electrically insulating spacer rings (not shown). ing.
[0023]
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The diaphragm 121 is made of a synthetic resin thin film having a metal deposition film on one
side opposite to the fixed electrode side, and is stretched on a metal diaphragm ring 122 with a
predetermined tension.
The metal deposition film is in contact with the diaphragm ring 122.
[0024]
For the fixed electrode 123, a metal plate such as aluminum is used.
The fixed electrode 123 is supported by an insulating seat 124 made of, for example, a synthetic
resin material.
In the fixed electrode 123 and the insulating seat 124, a large number of sound holes are bored
for causing the sound wave from the rear acoustic terminal 112 to act on the back side of the
diaphragm 121.
[0025]
An output terminal pin 125 of the microphone unit 10 is provided on the back side of the
insulating seat 124.
The output terminal pin 125 is connected to the fixed pole 123 through a wiring member (not
shown).
[0026]
The lock ring 13 is screwed into the unit case 11 using a female screw 113 for connection, and
the acoustoelectric converter 12 is firmly fixed in the unit case 11 by the lock ring 13.
[0027]
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Thus, the diaphragm ring 122 is in close contact with the front end wall of the unit case 11, and
the metal deposition film of the diaphragm 121 is conducted to the unit case 11 via the
diaphragm ring 122.
In this embodiment, the resonator 14 is put on the unit case 11.
[0028]
The unit holder 20 as a microphone body is a circuit board on which an outer cylinder 21 made
of a metal material, an inner cylinder 22 similarly made of a metal material, and an FET (field
effect transistor) 24 as an impedance converter are mounted. And a cover member 25 made of
synthetic resin, which is a member having a high volume resistivity.
[0029]
Further, the support tube 30 includes a flexible shaft 31 made of a steel wire rod, and the
microphone cable 40 is inserted into the support tube 30.
The support tube 30 may be entirely configured by the flexible shaft 31.
[0030]
Although only the front end side of the support tube 30 (flexible shaft 31) is shown in FIGS. 1
and 2, an output circuit or output of an audio signal is provided on the rear end side (base end
side) of the support tube 30 (not shown). A power module unit including a transformer or the
like is provided.
[0031]
For the microphone cable 40, a two-core shield coated wire having a feeder 41, a signal wire 42
and a shield coated wire 43 is used, one end of which is drawn into the unit holder 20 and the
other end connected to the power module portion It is done.
[0032]
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The outer cylindrical body 21 integrally includes a large diameter cylindrical portion 211 and a
small diameter cylindrical portion 212.
The large diameter cylindrical portion 211 has the same diameter as that of the unit case 11, and
a female screw 213 for connection is formed on the inner peripheral surface on the opening side,
and can be detachably attached to the unit case 11 via the connection ring 50. Connected to
[0033]
The connection ring 50 is made of metal and has an external thread 51 screwed to the internal
thread 113 of the unit case 11 and the internal thread 213 of the large diameter cylindrical
portion 211, and the upper external thread portion 511 in FIG. The lower external thread portion
512 is engaged with the internal thread 213 of the large diameter cylindrical portion 211,
thereby connecting the unit case 11 and the large diameter cylindrical portion 211.
[0034]
The small diameter cylindrical portion 212 of the outer cylindrical body 21 is fixed to one end
side of the flexible shaft 31 with electrical connection.
As the fixing method, pressure fitting or caulking or the like is preferable, but a conductive
adhesive may be used in combination.
Apart from this, the small diameter cylindrical portion 212 may be connected to one end side of
the flexible shaft 31 via a connection die not shown.
[0035]
The inner cylindrical body 22 also has the large diameter cylindrical portion 221 and the small
diameter cylindrical portion 222 integrally with the outer cylindrical body 21.
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It is preferable that both the outer cylindrical body 21 and the inner cylindrical body 22 be made
of a copper alloy such as brass having high conductivity.
[0036]
The outer diameter of the large-diameter cylindrical portion 221 of the inner cylindrical body 22
may be smaller than the inner diameter of the large-diameter cylindrical portion 211 of the outer
cylindrical body 21. In this embodiment, the inner cylinder is preferred as a preferred
embodiment. The outer diameter of the large-diameter cylindrical portion 221 is substantially the
same as the inner diameter of the large-diameter cylindrical portion 211 of the outer cylindrical
body 21, and the large-diameter cylindrical portions 211 and 221 contact each other. The
reference numeral 22 is coaxially supported in the outer cylinder 21. According to this, the inner
cylinder 22 can be easily incorporated into the outer cylinder 21 without rattling.
[0037]
The small-diameter cylindrical portion 222 of the inner cylindrical body 22 is fixed to the shieldcovered wire 43 of the microphone cable 40 with electrical connection.
As one example, in this embodiment, at one end side of the microphone cable 40, the shield
coated wire 43 is exposed and folded back, and the small diameter cylindrical portion 222 of the
inner cylinder 22 is covered on the folded back portion of the shield coated wire 43. The section
222 is crimped.
[0038]
The circuit board 23 is disposed at the opening end 223 of the large diameter cylindrical portion
221 of the inner cylindrical body 22.
In this embodiment, the circuit board 23 has the FET 24 as an impedance converter mounted on
one surface facing the microphone unit 10, and the output terminal pin 125 of the microphone
unit 10 is mounted on the gate electrode terminal thereof. A contactor 241 is provided which is a
leaf spring that comes in resilient contact.
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[0039]
The drain electrode terminal and the source electrode terminal (both not shown) of the FET 24
are provided on the other surface (back surface) of the circuit board 23. For example, the power
supply line 41 is connected to the drain electrode terminal. The signal line 42 is connected to the
terminal.
[0040]
In addition, a ground (ground) pattern 231 of the circuit board 23 is formed over the entire
circumference of the periphery of the other surface (rear surface) of the circuit board 23.
Contacts the open end 223 of the large diameter cylindrical portion 221 of the
[0041]
The cover member 25 made of synthetic resin is formed in a cylindrical shape that can cover the
entire outer cylinder 21 including the connecting portion between the outer cylinder 21 and the
unit case 11, and can slide on the flexible shaft 31. Is attached to
[0042]
First, the small diameter cylindrical portion 212 of the outer cylinder 21 is fixed to one end of
the flexible shaft 31, and then the small diameter cylindrical portion 222 of the inner cylinder 22
is fixed to the shield-covered wire 43 of the microphone cable 40. Do.
[0043]
Next, the feed line 41 of the microphone cable 40 and the signal line 42 are soldered to the
circuit board 23, and the circuit board 23 is disposed at the open end 223 of the large diameter
cylindrical portion 221 of the inner cylinder 22. Fit in the outer cylinder 21.
[0044]
Then, the lower half (the lower male screw portion 512) of the male screw 51 of the connection
ring 50 is screwed into the female screw 213 of the large diameter cylindrical portion 211 of the
outer cylindrical body 21.
The circuit board 23 is pressed against the opening end 223 of the large diameter cylindrical
portion 221 of the inner cylindrical body 22 by this screwing.
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[0045]
As a result, the unit holder 20 is assembled, and the female screw 113 of the unit case 11 is
screwed into the upper half (upper male screw portion 511) of the male screw 51 of the coupling
ring 50 to connect the microphone unit 10. The entire outer cylinder 21 is covered including the
connecting portion between the outer cylinder 21 and the unit case 11.
In this way, the microphone is assembled as shown in FIG.
[0046]
In this assembled state, the first electrostatic shield system (high frequency system) from the unit
case 11 through the outer cylinder 21 to the support tube 30 and the ground pattern 231 of the
circuit board 23 from the ground cylinder 231 through the inner cylinder 22 Since a double
shield is configured by the second electrostatic shield system (low frequency system) leading to
the shield coated wire 43, for example, even if the mobile phone is used in the vicinity of the
microphone, foreign matter into the unit holder 20 Inflow of high frequency current due to
electromagnetic waves is reliably prevented.
[0047]
In addition, since the unit holder 20 as the microphone body is covered with the synthetic resin
cover member 25 which is a member having a high volume resistivity, movement of charges
becomes slow even when touching the unit holder 20. Noise generation due to discharge at the
time of tentacles can also be prevented.
[0048]
Since a windscreen made of a sponge material or the like is usually covered on the microphone
unit 10 in order to prevent wind noise due to the air flow of an air conditioner or the like, almost
no charge movement occurs even when touching the windscreen Although not preferred, the
resonator 14 is preferably made of synthetic resin in consideration of the case where the
windscreen can not be covered.
[0049]
In the above embodiment, although the microphone unit 10 is attachable to and detachable from
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the unit holder 20 via the connection ring 50, an integral type in which the microphone unit 10
is integrated with the unit holder 20 is also included in the present invention.
[0050]
DESCRIPTION OF SYMBOLS 10 Microphone unit 11 Unit case 12 Electrostatic-type acousticelectric converter 20 Unit holder (microphone body) 21 Outer cylinder 22 Inner cylinder 211,
221 Large diameter cylindrical part 212, 222 Small diameter cylindrical part 23 Circuit board
231 Grounding pattern 24 FET (impedance converter) 25 cover member 30 support tube 31
flexible shaft 40 microphone cable 41 feed line 42 signal line 43 shield sheathed line 50
connection ring
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