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JP2017118385

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DESCRIPTION JP2017118385
Abstract: To provide a stable electromagnetic shield. A bottomed cylindrical microphone case 10,
a microphone unit 20 housed in the microphone case, and a cord bush 70 into which a
microphone cord 30 to which an audio signal from the microphone unit is output are inserted
The cord bush is attached to the opening of the microphone case to form a communication
passage 73h for communicating the outside of the microphone case with the inside of the
microphone case, is accommodated in the microphone case, and covers the communication
passage from the front. A member 50, comprising: a microphone. [Selected figure] Figure 1
マイクロホン
[0001]
The present invention relates to a microphone.
[0002]
Among the microphones, for example, a condenser microphone includes a diaphragm that
vibrates by a sound wave from a sound source, and a fixed electrode that constitutes a condenser
between the diaphragm and the diaphragm.
The capacitance of the capacitor changes as the diaphragm vibrates. The condenser microphone
outputs an audio signal according to the amount of change in capacitance of the condenser. The
audio signal is output to an external device such as a mixer or a speaker connected to the
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condenser microphone.
[0003]
Various directivity is set to the condenser microphone. Unidirectionality is one of the directivity.
Unidirectional condenser microphone (hereinafter referred to as "microphone") ) Picks up sound
waves in a specific direction (eg forward).
[0004]
FIG. 5 is a right side cross-sectional view of the conventional microphone.
[0005]
The microphone M picks up a sound wave from a sound source.
The microphone M includes a microphone case M10, a microphone unit M20, a code bush M30,
a microphone code M40, and a metal mesh M50.
[0006]
Here, the front of the microphone M is the direction (left side in the drawing) of the microphone
M directed to the sound source side at the time of sound collection. The rear of the microphone
M is the opposite direction (right side of the drawing).
[0007]
The microphone case M10 accommodates the microphone unit M20, a part of the front end side
of the microphone cord M40, and the metal mesh M50. The material of the microphone case
M10 is, for example, a metal such as a brass alloy. The shape of the microphone case M10 is a
bottomed cylindrical shape. A front sound hole M11h is formed on the bottom which is the front
surface of the microphone case M10. The front sound hole M11h introduces a sound wave from
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a sound source into the inside of the microphone case M10. A rear sound hole M12h is formed
on the circumferential surface of the microphone case M10. The rear sound hole M12h
introduces a sound wave from a sound source into the inside of the microphone case M10.
[0008]
The microphone unit M20 outputs an audio signal according to the sound wave from the sound
source.
[0009]
The cord bush M30 prevents the disconnection of the microphone cord M40.
The material of the cord bush M30 is an elastic material such as rubber. The shape of the cord
bush M30 is a truncated cone. In the cord bush M30, an insertion hole M31h is formed on the
central axis of the cord bush M30. The microphone code M40 is inserted into the insertion hole
M31 h.
[0010]
The microphone code M40 connects the microphone unit M20 and an external device (for
example, a speaker) not shown. The microphone cord M40 is a two-core shield wire including a
power supply wire M41, a signal wire M42, and a shield-covered wire (not shown). The power
supply line M41 supplies power to the microphone unit M20. The signal line M42 outputs the
audio signal output from the microphone unit M20 to an external device. The shield sheathing
wire is grounded to the ground. In FIG. 5, the shielded wire is not shown because it overlaps with
the power supply line M41.
[0011]
The metal mesh M50 prevents the inflow of foreign matter and electromagnetic waves into the
inside of the microphone case M10. That is, the metal mesh M50 constitutes a part of an
electromagnetic shield that prevents electromagnetic waves. The material of the metal mesh M50
is a metal such as stainless steel. The metal mesh M50 is a plain weave mesh body.
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[0012]
The metal mesh M50 is housed in the microphone case M10 together with the microphone unit
M20 and a part of the front end side of the microphone cord M40 connected to the microphone
unit M20. The metal mesh M50 is attached to the inner circumferential surface of the
microphone M10 and covers the rear sound hole M12h from the inside of the microphone case
M10. The cord bush M30 is fitted in the opening of the microphone case 10 and closes the
opening of the microphone case M10 from the rear. The microphone case M10 is screwed to the
cord bush M30.
[0013]
By the way, in recent years, with the spread of mobile phones, the microphone M may receive
strong electromagnetic waves from the mobile phones. When electromagnetic waves flow into
the inside of the microphone case M10, noise may be generated.
[0014]
So far, by covering a sound hole for introducing sound waves into the inside of the microphone
case with a metal mesh and configuring a part of the electromagnetic shield, there is a
technology that prevents the electromagnetic wave from the sound hole from flowing into the
microphone case It is proposed (for example, refer patent document 1).
[0015]
JP 2011-176613
[0016]
However, when the area of the metal mesh M50 in contact with the inner peripheral surface of
the microphone case M10 is small, the electrical connection between the inner peripheral surface
of the microphone case M10 and the metal mesh M50 tends to be unstable.
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If the contact between the metal mesh M50 and the microphone case M10 is unstable, the
electromagnetic shield of the microphone M becomes unstable.
As a result, the electromagnetic waves may flow into the inside of the microphone case M10
from the rear sound hole M12h. At this time, the microphone M may generate noise.
[0017]
The present invention has been made to solve the problems of the prior art as described above,
and it is an object of the present invention to provide a stable electromagnetic shield.
[0018]
The present invention comprises a bottomed cylindrical microphone case, a microphone unit
housed in the microphone case, and a cord bush into which a microphone cord to which an audio
signal from the microphone unit is output is inserted, The bush includes a communication
passage attached to the opening of the microphone case and communicating the outside of the
microphone case with the inside of the microphone case, and is accommodated in the
microphone case and includes an acoustic transmitting member covering the communication
passage from the front. A microphone characterized by
[0019]
According to the present invention, a stable electromagnetic shield can be provided.
[0020]
FIG. 1 is a right side cross-sectional view showing an embodiment of a microphone according to
the present invention.
It is a perspective view of the fixing member with which the microphone of FIG. 1 is provided.
It is a rear view of the code bush with which the microphone of FIG. 1 is provided.
It is a rear view of the microphone of FIG. It is right side view sectional drawing of the
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conventional microphone.
[0021]
Hereinafter, embodiments of a microphone according to the present invention will be described
with reference to the drawings.
[0022]
Microphone First, the configuration of the microphone according to the present invention will be
described.
[0023]
Configuration of Microphone FIG. 1 is a right side sectional view showing an embodiment of the
microphone according to the present invention.
FIG. 2 is a perspective view of a fixing member provided in the microphone of FIG.
[0024]
The microphone 1 picks up a sound wave from a sound source.
The microphone 1 is, for example, a unidirectional condenser microphone (hereinafter referred
to as a "microphone"). )である。
[0025]
Here, the front of the microphone is the direction of the microphone directed to the sound source
side at the time of sound collection (left side of the drawing). The back of the microphone is the
opposite direction (right side of the drawing).
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[0026]
The microphone 1 includes a microphone case 10, a microphone unit 20, a microphone cord 30,
a cord connecting member 40, an acoustic transmission member 50, a fixing member 60, and a
cord bush 70.
[0027]
The microphone case 10 accommodates the microphone unit 20, the cord connecting member
40, the sound transmitting member 50, and the fixing member 60.
The microphone case 10 is made of, for example, a brass alloy and has a bottomed cylindrical
shape. A sound hole 10 h is formed on the bottom which is the front surface of the microphone
case 10. The sound hole 10 h introduces a sound wave from a sound source into the inside of the
microphone case 10.
[0028]
The microphone unit 20 outputs an audio signal according to the sound wave from the sound
source. The microphone unit 20 includes a unit case 21, an electroacoustic transducer 22, an
insulating seat 23, an impedance transducer 24, and a circuit board 25.
[0029]
The unit case 21 accommodates the electroacoustic transducer 22, the insulating seat 23, the
impedance transducer 24, and the circuit board 25. The unit case 21 has a cylindrical shape with
a bottom. A sound hole 21 h is formed on the bottom surface which is the front surface of the
unit case 21. The sound holes 21 h introduce the sound waves introduced into the inside of the
microphone case 10 into the inside of the unit case 21. The electroacoustic converter 22, the
insulating seat 23, the impedance converter 24 and the circuit board 25 are accommodated in
the unit case 21 from the opening of the unit case 21. The circuit board 25 closes the opening of
the unit case 21.
[0030]
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The electroacoustic transducer 22 has a diaphragm that vibrates in response to the sound wave
from the sound source, and a fixed electrode that constitutes a capacitor between the diaphragm
and the diaphragm. The diaphragm and the fixed pole are disposed opposite to each other via a
spacer (not shown).
[0031]
The insulating seat 23 supports the fixed pole of the electroacoustic transducer 22.
[0032]
The impedance converter 24 is an impedance converter of the electroacoustic converter 22.
The impedance converter 24 is electrically connected to the fixed pole of the electroacoustic
transducer 22 and the circuit board 25.
[0033]
The circuit board 25 is electrically connected to the impedance converter 24 and the microphone
cord 30. The circuit board 25 is provided with lead wiring for each of a not-shown gate electrode,
a drain electrode, and a source electrode of the impedance converter 24.
[0034]
The microphone cord 30 connects the microphone unit 20 to an external device (for example, a
speaker). The microphone cord 30 is a two-core shield wire including a power supply wire 31, a
signal wire 32, and a shield-covered wire (not shown). For example, the power supply line 31
supplies power to the microphone unit 20. The signal line 32 outputs the audio signal output
from the impedance converter 24 to an external device. The shield sheathing wire is grounded to
the ground. The shielded wire is exposed at the front end of the microphone cord 30. The
exposed shield-covered wire is folded back to form a shield-covered wire exposed portion 33
covering the outer peripheral surface of the front end of the microphone cord 30.
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[0035]
The cord connecting member 40 is connected to the microphone cord 30. The material of the
cord connecting member 40 is a conductive material such as metal. The cord connecting member
40 includes a small diameter cylindrical portion 41 and a large diameter cylindrical portion 42.
[0036]
The small diameter cylindrical portion 41 fixes the microphone cord 30. The shape of the small
diameter cylindrical portion 41 is cylindrical. A projection 41 a is formed on the outer peripheral
surface of the rear end of the small diameter cylindrical portion 41 over the entire
circumference. The protrusion 41 a is engaged with the insertion hole of the cord bush 70
described later.
[0037]
The shape of the large diameter cylindrical portion 42 is cylindrical. The inner diameter of the
large diameter cylindrical portion 42 is larger than that of the small diameter cylindrical portion
41. A projection 42 a is formed on the outer peripheral surface of the front end of the large
diameter cylindrical portion 42 over the entire circumference. The protrusion 42 a abuts on the
inner circumferential surface of the microphone case 10.
[0038]
A stepped portion 43 is formed between the small diameter cylindrical portion 41 and the large
diameter cylindrical portion 42. The stepped portion 43 connects the small diameter cylindrical
portion 41 and the large diameter cylindrical portion 42. The shape of the step 43 is ring-shaped
in plan view. In the step portion 43, a plurality of through holes (communication holes) 43h are
formed at equal intervals along the circumferential direction. The through holes 43 h will be
described later.
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[0039]
The number and positions of the through holes 43 h are not limited to the present embodiment.
That is, for example, the through holes 43 h may be formed unevenly distributed along the
circumferential direction of the stepped portion 43.
[0040]
The sound transmitting member 50 prevents the inflow of foreign matter and electromagnetic
waves into the inside of the microphone case 10. That is, the sound transmitting member 50
constitutes a part of an electromagnetic shield that prevents electromagnetic waves. The sound
transmitting member 50 may also serve as a sound resistance material. The material of the sound
transmitting member 50 is a conductive metal that transmits sound waves. The sound
transmitting member 50 is, for example, a conductive cloth. In addition, the sound transmitting
member 50 may be formed, for example, in a ring shape having a central hole at the center in a
plan view. At this time, the inner diameter of the sound transmitting member 50 is larger than
the inner diameter of the small diameter cylindrical portion 41.
[0041]
The fixing member 60 fixes the sound transmitting member 50 inside the microphone case 10
and covers a part of the opening of the microphone case 10. The fixing member 60 prevents the
cord connecting member 40 and the sound transmitting member 50 stored in the microphone
case 10 from coming out of the microphone case 10. The fixing member 60 is disposed on the
rear side of the sound transmitting member 50. The fixing member 60 has a plate shape, and
includes a ring portion 61 and a contact portion 62. The fixing member 60 is, for example, a CR
type snap ring. The ring portion 61 is in the shape of a ring having an insertion hole 61 h at the
center. The contact portion 62 radially extends from the peripheral edge of the ring shape
obliquely rearward. The ring portion 61 is integrally formed with the contact portion 62. The
contact portion 62 contacts the inner peripheral surface of the microphone unit 10.
[0042]
The cord bush 70 prevents the microphone cord 30 from being broken. The shape of the cord
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bush 70 is a truncated cone. A communication groove 71 along the central axis of the cord
bushing 70 is formed on the outer peripheral surface of the cord bushing 70. An insertion hole
72 h is formed on the central axis of the cord bush 70. The microphone cord 30 is inserted into
the insertion hole 72h.
[0043]
FIG. 3 is a rear view of the cord bush 70. The communication grooves 71 are formed at six places
at equal intervals along the circumferential direction of the cord bush 70. The communication
groove 71 will be described later.
[0044]
The number and positions of the communication grooves 71 are not limited to the present
embodiment. That is, for example, the communication groove 71 may be formed to be unevenly
distributed along the central axis of the cord bush 70.
[0045]
Return to FIG. The inner diameter of the front half of the insertion hole 72h is larger than the
inner diameter of the rear half of the insertion hole 72h. The small diameter cylindrical portion
41 is inserted into the front half of the insertion hole 72h. The microphone cord 30 is inserted
through the rear half of the insertion hole 72h. Further, a locking groove is formed over the
entire circumference on the inner peripheral surface of the rear end of the front half of the
insertion hole 72h. The locking groove engages with the projection 41 a of the small diameter
cylindrical portion 41.
[0046]
● Method of manufacturing microphone 1
[0047]
Next, a method of manufacturing the microphone 1 will be described with reference to FIG.
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[0048]
First, the sound transmitting member 50 and the fixing member 60 are attached to the cord
connecting member 40.
The small diameter cylindrical portion 41 of the cord connecting member 40 is inserted from the
front into the center hole of the sound transmitting member 50 and the insertion hole 61 h of
the fixing member 60.
The sound transmitting member 50 is disposed between the step 43 and the fixing member 60.
The sound transmitting member 50 covers the through hole 43 h of the step 43 from the rear.
[0049]
Next, the shield-covered wire exposed portion 33 of the microphone cord 30 is inserted into the
small diameter cylindrical portion 41. At this time, the power supply line 31 of the microphone
code 30 and the signal line 32 of the microphone code 30 are exposed from the front end of the
microphone code 30 in advance. In this state, the small diameter cylindrical portion 41 is
crimped by a tool or the like not shown. Therefore, the inner circumferential surface of the small
diameter cylindrical portion 41 is in close contact with the shield-covered wire exposed portion
33. As a result, the shield-covered wire exposed portion 33 is fixed to the small diameter
cylindrical portion 41. The shield-covered wire exposed portion 33 is electrically connected to
the small diameter cylindrical portion 41.
[0050]
Next, the small diameter cylindrical portion 41 is attached to the cord bush 70. The small
diameter cylindrical portion 41 is inserted into the front half of the cord bush 70. The protrusion
41 a of the small diameter cylindrical portion 41 engages with the locking groove of the cord
bush 70. As a result, the cord connecting member 40 is fixed to the cord bush 70. At this time,
the sound transmission member 50 is sandwiched between the step 43 and the fixing member
60. That is, the front surface of the sound transmitting member 50 abuts on the rear surface of
the step 43 so as to cover the through hole 43 h of the step 43. The front surface of the fixing
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member 60 abuts on the rear surface of the sound transmitting member 50. The fixing member
60 is disposed between the sound transmitting member 50 and the cord bush 70. The contact
portion 62 of the fixing member 60 is disposed so as to be located between the communication
groove 71 and the communication groove 71 of the cord bush 70. The communication groove 71
is disposed so as to be located between the contact portion 62 and the contact portion 62. The
front surface of the cord bush 70 abuts on the rear surface of the fixing member 60. That is, the
sound transmitting member 50 is fixed by the cord bush 70 in a state of being in close contact
with the rear surface of the step 43 and the front surface of the fixing member 60. As a result,
the sound transmitting member 50 covers the through hole 43 h from the rear.
[0051]
Then, the power supply line 31 and the signal line 32 are attached to the circuit board 25 of the
microphone unit 20.
[0052]
Next, the microphone unit 20, the power supply line 31, the signal line 32, the cord connection
member 40, the sound transmission member 50 and the fixing member 60 are accommodated in
the microphone case 10.
At this time, from the front of the microphone case 10, the microphone unit 20, the power supply
line 31 of the microphone cord 30, the signal line 32, the cord connection member 40, the sound
transmission member 50, and the fixing member 60 are arranged. The cord bush 70 is fitted in
the opening of the microphone case 10 to close the opening of the microphone case 10. That is,
the cord bush 70 is attached to the opening of the microphone case 10.
[0053]
FIG. 4 is a rear view of the microphone 1. The front half of the communication groove 71 of the
cord bush 70 faces the inner peripheral surface of the microphone case 10 (see FIG. 1). A
communication passage 73 h is formed by the inner peripheral surface of the microphone case
10 and the communication groove 71. The communication passage 73 h causes the outside of
the microphone case 10 to communicate with the inside of the microphone case 10.
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[0054]
The communication passage 73h is formed by the communication groove 71 of the cord bush 70
and the microphone case 10. However, in the present invention, the communication passage for
communicating the outside of the microphone case 10 with the inside of the microphone case 10
is the cord bush It may be formed solely of That is, in this case, the communication passage is a
hole formed by penetrating the cord bush in the front-rear direction.
[0055]
Return to FIG. The protrusion 42 a of the large diameter cylindrical portion 42 abuts on the inner
peripheral surface of the microphone case 10. At this time, a space in which the microphone unit
20 is accommodated inside the microphone case 10 (hereinafter, referred to as a “space S”. Is
formed by the microphone case 10, the large diameter cylindrical portion 42, the stepped
portion 43, and the microphone cord 30).
[0056]
The communication passage 73 h causes the space S to communicate with the outside of the
microphone case 10. That is, the outside of the microphone case 10 communicates with the
space S via the space between the communication passage 73 h and the contact portion 62 of the
fixing member 60, the sound transmission member 50 and the through hole 43.
[0057]
The outer peripheral surface of the sound transmitting member 50 abuts on the inner peripheral
surface of the microphone case 10. The inner circumferential surface of the sound transmitting
member 50 abuts on the outer circumferential surface of the small diameter cylindrical portion
41. That is, the sound transmitting member 50 electrically connects the microphone case 10, the
small diameter cylindrical portion 41, the stepped portion 43, and the fixing member 60. The
sound transmitting member 50 covers the communication passage 73 h from the front.
[0058]
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The contact portion 62 of the fixing member 60 contacts the inner peripheral surface of the
microphone case 10 and is electrically connected to the microphone case 10.
[0059]
Thus, the microphone case 10, the cord connecting member 40, the sound transmitting member
50, and the fixing member 60 are electrically connected to each other.
The sound transmitting member 50 covers the through hole 43 h and the communication
passage 73 h. Further, the sound transmitting member 50 is sandwiched between the step 43
and the fixing member 60. That is, the sound transmitting member 50 stabilizes the electrical
connection with each member. The microphone case 10, the cord connecting member 40, the
sound transmitting member 50, and the fixing member 60 constitute an electromagnetic shield
of the microphone 1 to realize a stable electromagnetic shield.
[0060]
The sound wave from the sound source is introduced into the inside of the microphone case 10
through the communication passage 73h of the cord bush 70, the space between the contact
portions 62 of the fixing member 60, the sound transmission member 50, and the through hole
43h. Then, the microphone unit 20 is reached. That is, the communication path 73h functions as
a hole for introducing a sound wave to the back side of the diaphragm in order to realize
unidirectionality.
[0061]
According to the embodiment described above, the sound transmitting member 50 covering the
through hole 43 h and the communication passage 73 h is held between the cord connecting
member 40 and the fixing member 60 and fixed inside the microphone case 10. Ru. That is, the
microphone case 10 constituting the electromagnetic shield of the microphone 1, the cord
connection member 40, the sound transmission member 50, and the fixing member 60 realize
stable electrical connection. As a result, the electromagnetic wave from the communication
passage 73 h is shielded by the electromagnetic shield and does not flow into the inside of the
microphone case 10. Therefore, the microphone 1 does not generate noise. That is, the
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microphone 1 provides a stable electromagnetic shield.
[0062]
Reference Signs List 1 microphone 10 microphone case 10 h sound hole 20 microphone unit 21
unit case 21 h sound hole 22 electroacoustic transducer 23 fixed pole 24 impedance converter
25 circuit board 30 microphone cord 31 power line 32 signal line 33 shield coated wire exposed
portion 40 code connection Member 41 Small diameter cylindrical portion 41a Projection 42
Large diameter cylindrical portion 42a Projection 43 Step 43h Through hole (communication
hole) 50 Sound transmitting member 60 Fixing member 61 Ring portion 61h Insertion hole 62
Contact portion 70 Code bush 71 Communication groove 72h Insertion hole 73h communication
passage S space
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