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DESCRIPTION JP2013012882

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DESCRIPTION JP2013012882
Abstract: A condenser microphone unit capable of effectively preventing the occurrence of
natural vibration while enhancing the driving force of a diaphragm in a bidirectional component.
A diaphragm (2), a diaphragm ring (5) for holding the diaphragm (2) with a predetermined
tension, and a fixed pole (34) disposed opposite to the diaphragm (2) with a gap and constituting
a capacitor with the diaphragm (2). A condenser microphone unit 1 comprising: a unit case 10
accommodating the diaphragm ring 5, the diaphragm 2, and the fixed electrode 3, and a baffle
101 formed in a bowl shape on the outer peripheral edge of the unit case 10. The baffle 101 is
provided with electrostatic flocking 103 that prevents reflection of sound at least at an angle at
which the surface intersects with the surface and around the angle. [Selected figure] Figure 1
コンデンサマイクロホンユニット
[0001]
The present invention relates to a condenser microphone unit capable of effectively preventing
the occurrence of natural vibration as well as enhancing the driving force of a diaphragm in a
bidirectional component.
[0002]
The sound pressure gradient type condenser microphone unit has two acoustic terminals at the
front and the rear, takes in the sound pressure difference between these sound terminals, gives a
pressure difference to the front and back of the diaphragm, and performs acoustic-mechanical
conversion by this pressure difference. It is.
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1
In order to increase the sensitivity of such a condenser microphone unit, a large driving force for
the diaphragm is required, and in order to obtain a large driving force, it is sufficient to increase
the distance between the acoustic terminals.
[0003]
However, if the distance between the acoustic terminals is increased unavoidably, the high
frequency limit of the frequency response will be generated because the frequency at which the
driving force becomes zero occurs in the high frequency band where the half wavelength of the
sound wave becomes equal to the distance between the acoustic terminals. Lower the
[0004]
Therefore, as described in Patent Document 1, providing a leaky baffle made of an acoustic
resistive material between the acoustic terminals increases the frequency response of the middle
to high frequency to enhance the driving force to the diaphragm. Has been proposed.
If the diameter of the baffle is increased, the path for the sound waves to go around becomes
longer, so a long distance between the acoustic terminals can be secured.
[0005]
An example of a condenser microphone unit with a baffle is shown in FIG. The condenser
microphone unit 1 shown in FIG. 2 has a diaphragm 2 vibrating by sound waves and a fixed pole
(also referred to as a “back pole”) 3 disposed opposite to each other with a spacer 4
interposed therebetween. It is a kind of capacitor whose capacity changes. The diaphragm 2 is
attached to the holding ring 5 with a predetermined tension, and the sound coming from the
front acoustic terminal 6 on the front side (left of FIG. 2) of the diaphragm 2 and the rear side of
the diaphragm 2 ( It vibrates by the sound pressure difference of the sound which comes in from
the rear acoustic terminal 7 in the right of FIG.
[0006]
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2
An insulating seat 8 which is a fixed electrode support is disposed on the rear surface side of the
fixed electrode 3. Insulating seat 8 is made of, for example, a synthetic resin, and a circular
recessed portion 81 is formed on the front side (left side in FIG. 2). The fixed pole is fitted in the
recessed portion 81.
[0007]
A hole 82 is formed in the central portion of the insulating seat 8 in the thickness direction, and
a terminal member 9 is fitted in the hole 82. The terminal member 9 electrically connects the
fixed pole 3 and an FET (not shown) constituting an impedance converter.
[0008]
The insulating seat 8, the fixed electrode 3 fitted in the recessed portion 81 of the insulating seat
8, and the holding ring 5 to which the diaphragm 2 is attached are integrally assembled, and are
formed in a unit case 10 made of metal such as brass. Housed in
[0009]
A baffle 101 is formed on the outside of the unit case 10 in a bowl shape.
A sound wave conduction hole 102 is formed in the baffle 101, and when the sound wave passes
through the conduction hole 102, the sound wave from the front surface can wrap around to the
rear side of the microphone unit 10. By providing the baffle 101, the distance between the front
acoustic terminal 6 and the rear acoustic terminal 7 can be increased, and the sensitivity of the
condenser microphone unit 1 can be enhanced.
[0010]
In the condenser microphone unit 1 described above, when the diameter of the baffle 101 is
increased, a diffraction effect is generated at a low frequency, and the directional frequency
response is degraded.
[0011]
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The diffraction effect is a phenomenon that when an angle is present at the periphery of the
opening of the conduction hole 102 of the baffle 101, the sound wave is reflected by the angle,
the wavefront is disturbed, and the frequency characteristic is degraded.
Therefore, the diffraction effect can be reduced by eliminating the corner of the opening
periphery.
[0012]
The diffraction effect can also be reduced by attaching an acoustic resistance material such as a
sponge or a felt to the opening to cover the corner of the opening periphery. Furthermore, as
described in Patent Document 2, the first acoustic resistance material is attached to the opening,
and a second acoustic resistance value is smaller than that of the first acoustic resistance
material around the end of the baffle. By attaching the resistance material, the diffraction effect
can be more effectively reduced.
[0013]
Japanese Utility Model Application Publication No. 06-058696 Japanese Utility Model
Application Publication No. 06-077 394
[0014]
By the way, when the mechanical strength of the baffle is low, it may be vibrated by the sound
wave, which may damage the timbre.
Therefore, although it is preferable that the baffle plate is formed using a material having
mechanical strength such as a metal plate as described above, the metal plate having high
mechanical strength is likely to have natural vibration, so that damping is effectively performed.
There is a need to do. Moreover, in order to attach an acoustic resistance material, the part
equivalent to a glue margin is needed, and it becomes disadvantageous for the miniaturization of
a condenser microphone unit.
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[0015]
The present invention has been made in view of the above-described problems, and can increase
the driving force of the diaphragm in the bi-directional component and effectively reduce the
diffraction effect without using an acoustic resistance material. An object of the present invention
is to provide a condenser microphone unit capable of effectively preventing the occurrence of
natural vibration.
[0016]
A condenser microphone unit according to the present invention comprises: a diaphragm; a
diaphragm ring for holding the diaphragm with a predetermined tension; and a fixed pole which
is disposed opposite to the diaphragm with a gap and forms a capacitor with the diaphragm. In a
condenser microphone unit including a unit case for housing the diaphragm ring, the diaphragm
and the fixed electrode, and a baffle formed in a bowl shape on the outer peripheral edge of the
unit case, the baffle has at least a surface and a surface. The most important feature is that it has
flocked hairs that prevent reflection of sound at the corners where the lights meet and around
the corners.
[0017]
The present invention can provide a condenser microphone unit capable of effectively preventing
the occurrence of natural vibration while enhancing the driving force of the diaphragm in the
bidirectional component by applying electrostatic flocking to the baffle. .
[0018]
An example of a condenser microphone unit concerning the present invention is shown, (A) is a
longitudinal section, and (B) is a top view.
The example of the conventional condenser microphone unit is shown, (A) is a longitudinal crosssectional view, (B) is a top view.
[0019]
Hereinafter, embodiments of a condenser microphone unit according to the present invention
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will be described with reference to the drawings.
The same components as those of the conventional condenser microphone unit shown in FIG. 2
are denoted by the same reference numerals.
[0020]
As shown in FIG. 1, the condenser microphone unit 1 is a kind of a capacitor in which the
capacitance is changed by the vibration of the diaphragm 2 by arranging the diaphragm 2 and
the fixed electrode 3 vibrating by sound waves to face each other via the spacer 4 Has become a
capacitor.
The diaphragm 2 is attached to the holding ring 5 with a predetermined tension, and the sound
coming from the front acoustic terminal 6 on the front side (left of FIG. 2) of the diaphragm 2
and the rear side of the diaphragm 2 ( It vibrates by the sound pressure difference of the sound
which comes in from the rear acoustic terminal 7 in the right of FIG.
[0021]
An insulating seat 8 which is a fixed electrode support is disposed on the rear surface side of the
fixed electrode 3. Insulating seat 8 is made of, for example, a synthetic resin, and a circular
recessed portion 81 is formed on the front side (left side in FIG. 1). The fixed pole 3 is fitted in
the recessed portion 81.
[0022]
A hole 82 is formed in the central portion of the insulating seat 8 in the thickness direction, and
a terminal member 9 is fitted in the hole 82. The terminal member 9 is electrically connected to
an FET (not shown) that constitutes an impedance converter.
[0023]
The insulating seat 8, the fixed electrode 3 fitted in the recessed portion 81 of the insulating seat
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8, and the holding ring 5 to which the diaphragm 2 is attached are integrally assembled, and are
formed in a unit case 10 made of metal such as brass. Housed in
[0024]
A baffle 101 is formed on the outside of the unit case 10 in a bowl shape.
A conduction hole 102 is formed in the baffle 101, and the sound wave from the front surface
wraps around the rear side of the condenser microphone unit 1 by passing through the
conduction hole 102. Due to the presence of the baffle 101, the distance between the front
acoustic terminal 6 and the rear acoustic terminal 7 can be increased, and the sensitivity of the
condenser microphone unit 1 can be enhanced.
[0025]
On the surface of the baffle 101 and the inner circumferential surface of the conduction hole
102, electrostatic flocking 103 is applied. By applying electrostatic flocking 103 at these
positions, an infinite number of piles are rising around the angle at which the plane intersects the
plane and around the corner, so the sound wave traveling toward the corner is between the
infinite number of piles. And effectively prevent the diffraction of sound waves.
[0026]
Also, when electrostatic flocking 103 is applied to the conduction hole 102, as described above,
the sound wave is confined between the countless piles, and the sound wave coming toward the
corner around the conduction hole 102 is confined. While preventing the diffraction of the sound
wave coming toward the corner around the conduction hole, electrostatic flocking 103 has an
effect as an acoustic resistance. Therefore, it is not necessary to attach the acoustic resistance
material as in the conventional condenser microphone unit 1, and a space corresponding to a
glue margin required for attaching the acoustic resistance material can be omitted, and the
condenser microphone unit 1 can be miniaturized.
[0027]
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In addition, the cushioning property of the electrostatic bristles 103 can suppress the natural
vibration of the unit case 10, and the deterioration of the acoustic characteristics can be
effectively prevented.
[0028]
The range in which the electrostatic flocking is performed on the baffle 101 is sufficient if it is at
least an angle at which the surface intersects with the surface and the periphery thereof.
The same applies to the corner around the sound wave conduction hole 102, as long as
electrostatic flocking is applied to at least the corner and its periphery, if electrostatic flocking is
applied to the entire surface of the baffle including the corner and its periphery Good.
[0029]
DESCRIPTION OF SYMBOLS 1 capacitor microphone unit 2 diaphragm 3 fixed pole 4 spacer 5
holding ring 6 front acoustic terminal 7 rear acoustic terminal 8 insulation seat 81 recessed part
82 hole 9 terminal member 10 unit case 101 baffle 102 conduction hole 103 electrostatic
flocking
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