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JP2015213214

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DESCRIPTION JP2015213214
An object of the present invention is to prevent generation of vibration noise in a composite
microphone provided with first and second unidirectional microphone units having different
electroacoustic conversion systems. A composite microphone is provided with a unidirectional
dynamic microphone unit 10 and a unidirectional condenser microphone unit 30, and the
diaphragms 16 and 32 of the two microphone units are coaxially arranged. Is configured. The
sound inlet 18a of the front acoustic terminal in the dynamic microphone unit 10 is provided
forward in the axial direction, and the sound inlet 18c of the rear acoustic terminal in the
condenser microphone unit 30 is the front of the dynamic microphone unit 10. It is provided in
the state orthogonal to the said axial direction toward the outer peripheral direction of the
condenser microphone unit 30 in the outer side of an acoustic terminal. [Selected figure] Figure
2
Composite microphone
[0001]
The present invention relates to a composite microphone provided with a plurality of
microphone units having different electroacoustic conversion systems.
[0002]
When collecting a musical instrument, microphones different in electroacoustic conversion
system, for example, a condenser type microphone and a dynamic type microphone may be
collected side by side.
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According to this, sound waves from the same sound source can be collected by the microphones
of different conversion methods with unique sound quality. Therefore, by appropriately mixing
these audio signals, it becomes possible to obtain an audio signal that makes use of the
characteristics of each microphone, or an audio signal that is more in line with the actual
situation. As described above, most of the sound collection methods using a plurality of
microphones of different conversion methods are used for sound collection of bass drums and
the like.
[0003]
In this case, the diaphragms of the two microphones are preferably arranged equidistant from
the sound source, so that the phases of the signals output from the respective microphone units
can be matched. Therefore, when the microphone units are arranged side by side so that the
diaphragms of the two microphones are equidistant from the sound source, the sound waves
from the direction of 90 degrees with respect to the directional axis of the microphone units
differ according to each microphone unit It will be taken in from the acoustic terminal of the
position. Therefore, when the microphone is rotated about the directional axis of the microphone,
there arises a problem that the frequency response and the tone change.
[0004]
In order to solve the above-mentioned technical problems, the present applicant is a composite
type in which a unidirectional condenser microphone as a second microphone unit is disposed in
front of the unidirectional dynamic microphone as a first microphone unit. A microphone has
been proposed earlier, which is disclosed in Patent Document 1.
[0005]
FIG. 3 is a cross-sectional view of the composite microphone disclosed in Patent Document 1. As
shown in FIG.
As shown in FIG. 3, a condenser microphone unit 60 as a second microphone unit is attached in
front of the dynamic microphone unit 50 as a first microphone unit. Thus, a composite
microphone is configured by two microphone units 50 and 60 having different electroacoustic
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2
conversion systems.
[0006]
The dynamic microphone unit 50 includes a diaphragm 51 including a center dome 51a and a
sub dome 51b, and the voice coil 52 attached along the boundary between the center dome 51a
and the sub dome 51b includes a magnetic circuit 54 including a magnet 53. Are arranged in the
magnetic gap G of The dynamic microphone unit 50 is provided with a cylinder member 57
which forms a rear acoustic terminal 55 and an air chamber 56 of a predetermined capacity on
the side and back sides of the magnetic circuit 54 in order to form unidirectionality. The sound
wave from the rear acoustic terminal 55 is configured to act on the back side of the diaphragm
51.
[0007]
Further, on the front side of the diaphragm 51, a resonator 58 for improving the high frequency
characteristic of the dynamic microphone unit 50 is disposed, and in the resonator 58, a plurality
of openings 59 are annularly arranged. Therefore, in this embodiment, the opening 59 provided
in the resonator 58 constitutes a front acoustic terminal of the dynamic microphone unit 50.
[0008]
The condenser microphone unit 60 is attached to the front side of the central portion of the
resonator 58 so as to project forward. In the condenser microphone unit 60, the diaphragm 61
and the fixed electrode 62 are disposed in the unit case 63 in a state where the diaphragm 61
and the fixed electrode 62 face each other, and impedance conversion is performed by the FET
64 connected to the fixed electrode 62 to extract an audio signal.
[0009]
The condenser microphone unit 60 is provided with openings communicating with the back
surface with respect to the insulator 65 and the substrate 66 in order to form unidirectionality,
and a plurality of openings 67 formed in the substrate 66. Constitute a rear acoustic terminal of
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the condenser microphone unit 60. Further, an opening 68 for releasing the front surface of the
diaphragm 61 to the external space is formed on the front side of the unit case 63, and the
opening 68 constitutes a front acoustic terminal of the condenser microphone unit 60.
[0010]
According to the composite microphone of the configuration shown in FIG. 3, the condenser
microphone unit 60 as the second microphone unit is disposed immediately in front of the front
acoustic terminal 59 of the dynamic microphone unit 50 as the first microphone unit. In this
case, preferably, when the radius of the first microphone unit 50 is ad, the second microphone
unit 60 is disposed in the range from the front acoustic terminal 59 of the first microphone unit
50 to the front 0.61 × ad. Ru.
[0011]
According to this configuration, the second microphone unit is disposed in the area of air
vibrating in the same phase as the diaphragm of the first microphone unit, and as a result, the
diaphragms of the first and second microphone units are in phase. It will vibrate. Therefore, as
shown in FIG. 3, even if the diaphragms 51 and 61 of the first and second microphone units are
offset from each other, the phases of the signals output from the microphone units 50 and 60
should be matched. Can.
[0012]
Patent No. 4912034 gazette
[0013]
By the way, it is known that the unidirectional dynamic microphone as the first microphone unit
described above has a property in which an omnidirectional component and a bidirectional
component are combined.
Since the bi-directional component of the unidirectional dynamic microphone is mass control, the
resonant frequency of the diaphragm is set near the lower limit of the sound collection band.
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And, at this resonance frequency, the vibration speed of the diaphragm becomes high.
[0014]
When the diaphragm receives vibration due to the sound wave, the sound wave is simultaneously
applied to the unidirectional condenser microphone as the second microphone unit, so that the
following problems do not occur. However, when vibration is applied to, for example, the abovementioned cylinder member 57 or the like that constitutes the outer case of the dynamic
microphone unit 50, uni-directionality as compared to the diaphragm 61 of the unidirectional
directivity condenser microphone unit 60. The diaphragm 51 of the dynamic microphone unit 50
is largely displaced near its resonance frequency. The reason is that the mass of the diaphragm
of the dynamic microphone reaches 10 times or more with respect to the condenser microphone.
[0015]
When the diaphragm 51 of the dynamic microphone unit 50 is displaced by the vibration applied
to the cylinder member 57 or the like described above, the air in front of the diaphragm vibrates
in the same manner as the diaphragm 51. The sound wave of the diaphragm 61 of the is applied
to the rear acoustic terminal 67 of the unidirectional condenser microphone unit 60.
[0016]
In particular, according to the composite microphone of the configuration shown in FIG. 3, since
the rear acoustic terminal 67 of the unidirectional condenser microphone unit 60 is in front of
and immediately in front of the diaphragm 51 of the dynamic microphone unit 50 The sound
signal from the condenser microphone unit 60 also generates vibration noise due to the vibration
of the cylinder member 57 described above.
[0017]
That is, in the single unit of the condenser microphone unit 60, vibration noise is unlikely to
occur.
However, according to the configuration including the dynamic microphone unit 50 and the
condenser microphone unit 60 as in the composite microphone shown in FIG. 3, noise due to
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vibration (displacement) of the diaphragm of the dynamic microphone 50 is also transmitted to
the condenser microphone 60. As a result, vibrational noise is generated from the condenser
microphone 60 as well.
[0018]
The present invention has been made focusing on the above-mentioned problems, and in a
composite microphone provided with first and second unidirectional microphone units having
different electroacoustic conversion systems, a diaphragm of the first microphone unit It is an
object of the present invention to provide a composite type microphone which can prevent
generation of vibration noise in a signal output of a second microphone unit by sound waves
generated by the vibration of.
[0019]
The composite microphone according to the present invention, which was made to solve the
above-mentioned problems, is a composite type in which the electroacoustic conversion system is
different, and each of which comprises a first microphone unit and a second microphone unit
having single directivity. A microphone, wherein a diaphragm of the second microphone unit is
coaxially disposed in front of a diaphragm of the first microphone unit, and a sound wave
introduction port of a front acoustic terminal in the first microphone unit is a first microphone.
An axial forward direction of the microphone unit is provided, and a sound wave introduction
port of the rear acoustic terminal in the second microphone unit is outside the front acoustic
terminal of the first microphone unit, and an outer peripheral direction of the second
microphone unit Provided in a state of being orthogonal to the axial direction toward To.
[0020]
In this case, it is preferable that the diameter of the diaphragm of the second microphone unit is
set smaller than the diameter of the diaphragm of the first microphone unit.
[0021]
And in a preferred embodiment, the second microphone unit is attached to a central portion of a
resonator disposed facing the diaphragm of the first microphone unit, and the resonator is
formed in the resonator so as to surround the second microphone unit. Each of the plurality of
openings constitutes the sound wave introduction port of the front acoustic terminal in the first
microphone unit.
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In addition, each opening formed from the back surface of the second microphone unit toward
the peripheral portion of the resonator through the sound conduit in the resonator constitutes
the sound wave introduction port of the rear acoustic terminal in the second microphone unit.
Form is made.
[0022]
In this case, the openings forming the sound wave introduction port of the front acoustic
terminal in the first microphone unit are arranged along the circumferential direction of the
resonator, and in the second microphone unit between the openings in the resonator A
configuration in which the sound conduits communicating with the rear acoustic terminals are
arranged radially can be suitably employed.
[0023]
Preferably, a dynamic microphone unit is used as the first microphone unit, and a condenser
microphone unit is used as the second microphone unit.
[0024]
According to the composite microphone of the present invention, the diaphragm of the second
microphone unit is coaxially disposed in front of the diaphragm of the first microphone unit.
Then, the sound wave introduction port of the front acoustic terminal in the first microphone
unit is provided forward in the axial direction of the first microphone unit.
On the other hand, the sound wave introduction port of the rear acoustic terminal in the second
microphone unit is disposed outside the front acoustic terminal of the first microphone unit, and
is orthogonal to the axial direction toward the outer peripheral direction of the second
microphone unit Provided in a state of
[0025]
Therefore, even if the diaphragm of the first microphone unit receives displacement and the
01-05-2019
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diaphragm of the first microphone unit is displaced, the sound wave of the diaphragm of the first
microphone unit accompanying this is transmitted through the front acoustic terminal of the first
microphone unit to the second microphone It can be effectively blocked from joining the rear
acoustic terminals of the unit.
Therefore, it is possible to provide a composite microphone that can prevent excessive vibration
noise from being superimposed on the signal output of the second microphone unit by the sound
wave due to the vibration of the diaphragm of the first microphone unit.
[0026]
FIG. 2 is a front view of the composite microphone according to the present invention as viewed
from the front in the axial direction.
It is sectional drawing of the state seen in the arrow direction from the AA in FIG.
It is sectional drawing which showed an example of the conventional composite type
microphone.
[0027]
A composite microphone according to the present invention will be described based on the
embodiments shown in FIG. 1 and FIG. In this composite type microphone, a uni-directional
dynamic microphone unit 10 is used as a first microphone unit, and a uni-directional condenser
microphone unit 30 is used as a second microphone unit. The diaphragm of the condenser
microphone unit 30 is coaxially disposed in front of the diaphragm of the dynamic microphone
unit 10, and the condenser microphone unit 30 in front of the diaphragm of the dynamic
microphone unit 10 in the rear is arranged. The diameter of the diaphragm is set small.
[0028]
First, the dynamic microphone unit 10 as a first microphone unit is provided with a unit frame
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11 that constitutes a part of a magnetic circuit. In this embodiment, the unit frame 11 functions
as an outer yoke. An annular inner yoke 12 is disposed in the central hole of the unit frame 11,
and an annular magnet 13 is disposed on the inner yoke 12. Further, an annular pole piece 14 is
mounted on the magnet 13.
[0029]
The outer peripheral surface of the inner yoke 12 is in close contact with the unit frame 11,
while an annular gap is formed between the outer peripheral surface of the pole piece 14 and the
inner peripheral surface of the unit frame 11. The gap forms a magnetic gap G of a magnetic
circuit including the magnet 13.
[0030]
A cylindrical member 15 is fixed to the outer periphery of the upper end portion of the unit
frame 11, and the outer peripheral edge of the diaphragm 16 is attached to the inner peripheral
edge of the upper end portion of the cylindrical member 15.
The diaphragm 16 is composed of a center dome 16a and a sub dome 16b, and a voice coil 17 is
attached along the back surface of the boundary portion between the center dome 16a and the
sub dome 16b. It is housed inside.
[0031]
The cylindrical member 15 is formed with a flange 15a toward the inner peripheral side of the
upper end portion, and in this flange 15a, openings 15b penetrating the flange 15a vertically are
formed at a plurality of circumferential positions There is. The opening 15 b communicates with
the back surface of the diaphragm 16, and thus the opening 15 b constitutes a rear acoustic
terminal of the unidirectional dynamic microphone unit 10.
[0032]
A resonator 18 is disposed on the front surface of the diaphragm 16 so as to face the diaphragm
16. The resonator 18 is attached to the inner periphery of the front end portion of the cylindrical
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member 15 described above. The uni-directional condenser microphone unit 30 as the second
microphone unit is attached to the front of the central portion of the resonator 18. The resonator
18 serves not only to protect the diaphragm 16 but also to form an air chamber in a gap with the
diaphragm 16 and to improve the frequency response of the high frequency range by the
resonance of the air chamber.
[0033]
In this embodiment, the resonator 18 is used to improve the frequency response in the high
frequency range, but instead of this resonator, a member for simply attaching the second
microphone unit 30 may be disposed. Therefore, in this specification, including the mounting
members of the second microphone unit 30, these will be called resonators.
[0034]
In the resonator 18, as shown in FIG. 1, a plurality (five in this embodiment) of circular openings
18a are formed at equal intervals along the circumferential direction so as to surround the
second microphone unit 30. The opening 18 a constitutes a sound wave introduction port of the
front acoustic terminal of the first microphone unit 10.
Therefore, the sound wave introduction port 18 a of the front acoustic terminal in the first
microphone unit 10 is formed forward in the axial direction of the first microphone unit 10.
[0035]
A lid 19 is fitted in and attached to the opening of the rear end portion of the unit frame 11,
thereby forming an air chamber 20 in the unit frame 11. The acoustic resistor 21 is
accommodated in the air chamber 20.
[0036]
The unidirectional condenser microphone unit 30, which constitutes the second microphone unit,
is attached to the center of the front surface of the resonator 18 as described above. In the
condenser microphone unit 30, the diaphragm 31 and the fixed electrode 32 are disposed in the
01-05-2019
10
unit case 33 in a state where the diaphragm 31 and the fixed electrode 32 face each other, and
the axis passing through the center of the diaphragm 31 is the vibration of the dynamic
microphone unit 10 as described above. In order to coincide with the axis passing through the
center of the plate 16, that is, both are arranged coaxially.
[0037]
Then, an FET 34 is connected to the fixed electrode 32 and impedance conversion is performed
by the FET 34 so that an audio signal of the condenser microphone unit 30 is extracted. In the
unit case 33, the insulator 35 and the substrate 36 are disposed on the back of the fixed
electrode 32, and in the insulator 35 and the substrate 36, sound conducting holes
communicating with the back of the diaphragm 31 are formed respectively. ing.
[0038]
A rear acoustic terminal is formed on the condenser microphone unit 30 via a sound conduit,
which will be described later, formed in the resonator 18 in order to form unidirectionality, and
on the front side of the unit case 33. An opening 38 is formed to release the front surface of the
diaphragm 31 to the external space, and the opening 38 constitutes a front acoustic terminal of
the condenser microphone unit 30.
[0039]
In the above-described resonator 18, a sound conduit 18b is formed which continues to the back
of the condenser microphone unit 30.
As shown in FIG. 1, the sound conduits 18 b are formed radially between the openings 18 a that
constitute the front acoustic terminals of the first microphone unit 10. And each opening 18c of
the sound conduit 18b formed toward the peripheral part of the resonator 18 constitutes the
sound wave introduction port of the rear acoustic terminal in the second microphone unit.
[0040]
That is, according to the composite microphone shown in FIGS. 1 and 2, the sound wave
introduction port 18 a of the front acoustic terminal in the first microphone unit 10 is provided
forward in the axial direction of the first microphone unit 10. On the other hand, the sound inlet
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18c of the rear acoustic terminal in the second microphone unit 30 is orthogonal to the axial
direction of the second microphone unit 30 outside the front acoustic terminal of the first
microphone unit 10 It is provided in the state.
[0041]
With this configuration, even if the diaphragm 16 of the first microphone unit 10 is displaced
due to vibration, the sound wave of the diaphragm of the first microphone unit accompanying
this is applied to the rear acoustic terminal 18c of the second microphone unit 30. Can be
effectively blocked.
As a result, it is possible to prevent the vibration noise from being superimposed on the signal
output of the second microphone unit 30 by the sound wave generated by the vibration of the
diaphragm 16 of the first microphone unit 10, as described in the column of the effect of the
invention described above. The same function and effect can be obtained.
[0042]
10 1st microphone unit (dynamic microphone unit) 11 unit frame (outside yoke) 12 inner yoke
13 magnet 14 pole piece 15 cylindrical member 15a flange 15b opening (rear acoustic terminal
of first microphone unit) 16 diaphragm 17 voice coil 18 resonator 18a opening (front acoustic
terminal of first microphone unit) 18b sound conduit 18c opening (rear acoustic terminal of
second microphone unit) 30 second microphone unit (condenser microphone unit) 31 diaphragm
32 fixed electrode 33 unit case 34 FET 38 opening (Front acoustic terminal of the second
microphone unit) G Magnetic gap
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