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DESCRIPTION JP2011055062

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DESCRIPTION JP2011055062
An object of the present invention is to effectively cause a velocity component entering from a
rear acoustic terminal to act on the back surface of a diaphragm on the front acoustic terminal
side. SOLUTION: Two capacitor elements 10 and 100 are provided, in which a diaphragm and a
fixed pole having a sound hole are disposed opposite to each other via a spacer ring, and fixed
poles 14 and 140 of the capacitor elements 10 and 100 are It is supported on both sides of the
insulating seat 15 having an opening 151 at the center, and both ends of the opening 151 are
covered with the acoustic resistance members 18 and 180 and between the fixed pole 14 and
140 and the insulating seat 15 In the variable directivity condenser microphone unit in which
the air chambers A1 and A2 of the volume are provided, the acoustic resistance members 18 and
180 are the tops of the inner surfaces of the insulating seats 15 facing the fixed poles 14 and
140 respectively. A conical surface 152 is formed with the rim of the skirt as a skirt, and the air
chambers A1 and A2 operate as acoustic transformers. [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, and more particularly, to a
technology for effectively causing a velocity component of collected sound waves to act on the
back surface side of a diaphragm to improve directional frequency response.
[0002]
Among the condenser microphones, a unit having an omnidirectional component requires an air
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chamber.
These include omnidirectional condenser microphones, unidirectional condenser microphones
and variable directional condenser microphones with side entry and back and forth diaphragms.
[0003]
Among these, in the unidirectional condenser microphone and the variable directivity condenser
microphone, it is necessary to take in the velocity component into the air chamber through a
predetermined acoustic resistance material. The configuration of this point will be described by
taking the variable directional condenser microphone unit shown in FIG. 4 as an example.
[0004]
For example, as described in Patent Document 1, the variable directional capacitor microphone
unit has, as a basic configuration, an insulating seat 15 made of a synthetic resin or the like, and
first and second supports supported on both sides of the insulating seat 15. And two capacitor
elements 10 and 100.
[0005]
Since capacitor elements 10 and 100 have the same configuration except that the arrangement is
symmetrical, one first capacitor element 10 will be described here, and the other reference for
second capacitor element 100 will be the corresponding reference The sign is shown in
parentheses.
[0006]
In the capacitor element 10 (100), the diaphragm 11 (110) stretched on the diaphragm ring 12
(120) and the fixed electrode 14 (140) are disposed to face each other via the spacer ring 13
(130). It consists of
[0007]
A thin air layer corresponding to the thickness of the spacer ring 13 (130) is provided between
the diaphragm 11 (110) and the fixed electrode 14 (140).
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Although not shown, a metal porous plate having a large number of sound holes (a hole through
which sound waves pass) is used for the fixed pole 14 (140).
[0008]
The capacitor element 10 (100) is fixed to the insulating seat 15 via the connection ring 17
(170) in a state where the resonator 16 (160) made of a metal plate is assembled on the front
side.
In the resonator 16 (160), an acoustic terminal hole 16a (160a) for taking in a sound wave is
formed, and an electrode terminal 19 (190) is attached.
[0009]
Both side surfaces of the insulating seat 15 are recessed in a dish shape, and an air chamber A1
(A2) is formed between the fixed electrode 14 (140) and the insulating seat 15.
The insulating seat 15 is provided with an opening (communication hole) 151 at its central
portion, and both ends of the opening 151 are covered with acoustic resistance members 18 and
180.
[0010]
Thus, the variable directional capacitor microphone unit includes the first unidirectional unit
consisting of the first capacitor element 10 and the second unidirectional unit consisting of the
second capacitor element 100 on the insulating seat 15. The configuration is acoustically
combined via the provided opening 151 and the acoustic resistance members 18 and 180, and
nondirectionality, unidirectionality, by the way of applying a voltage to each unidirectionality
unit, Either of bi-directionality can be selected (see, for example, Patent Document 2 in this
regard).
[0011]
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Here, in FIG. 4, assuming that there is a sound source on the side of the first condenser element
10, the velocity component of the collected sound wave is picked up by the diaphragm 110 of
the second condenser element 100 on the side of the rear acoustic terminal and The sound
pressure of the velocity component due to the vibration of the diaphragm 110 is as follows: air
chamber A2 → opening 151 having acoustic resistance members 18 and 180 at both ends → the
diaphragm 11 of the first capacitor element 10 via a path including air chamber A1. It will act on
the back.
[0012]
However, in the conventional variable directional condenser microphone unit, as shown in FIG. 4,
the air chamber A1 (A2) is formed as a substantially constant depth (recessed amount) on the
side surface of the insulating seat 15. When viewed from the acoustic resistance material 18 of
the opening 151 provided at the center of the insulating seat 15, the distance to the peripheral
portion of the diaphragm 11 is longer than the distance to the central portion of the diaphragm
11.
[0013]
Therefore, there is a problem that the diaphragm 11 of the first capacitor element 10 can not be
effectively operated by the velocity component of the collected sound wave.
This problem occurs not only in the above-described variable directional condenser microphone
unit but also in a unidirectional condenser microphone unit.
[0014]
JP, 2005-184347, A JP, 7-143,595, A
[0015]
Therefore, an object of the present invention is to effectively cause the velocity component
entering from the rear acoustic terminal to act on the back surface of the front acoustic terminal
side diaphragm in a unidirectional condenser microphone unit or a variable directional
condenser microphone unit. is there.
[0016]
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In order to solve the above problems, the present invention is provided with a capacitor element
formed by opposingly arranging a diaphragm tensioned to a diaphragm ring and a fixed pole
having a sound hole via a spacer ring, and the fixed pole Is supported by an insulating seat
having an opening at its center, and the opening is covered with an acoustic resistance material,
and an air chamber of a predetermined volume is provided between the fixed electrode and the
insulating seat, In the condenser microphone unit configured such that the velocity component of
the sound wave acting on the back surface of the diaphragm via the aperture of the sound wave
resistance member, the air chamber and the sound hole of the fixed pole, the fixed pole The inner
surface of the opposing insulating seat is characterized in that a conical surface is formed with
the acoustic resistance material at the top and the periphery of the insulating seat as a skirt.
[0017]
The present invention also includes first and second two capacitor elements formed by
opposingly arranging a diaphragm tensioned on a diaphragm ring and a fixed pole having a
sound hole via a spacer ring, The fixed poles of the first and second capacitor elements are
supported on both sides of an insulating seat having an opening at the center, and both ends of
the opening are covered with an acoustic resistance material, and the fixed poles are also fixed.
In a variable directivity condenser microphone unit, an air chamber having a predetermined
volume is provided between the first and second insulating seats, and the back sides of the
diaphragms of the first and second condenser elements are in acoustic communication. Each of
the inner surfaces of the insulating seat facing each fixed pole is characterized in that a conical
surface is formed with the acoustic resistance material at the top and the periphery of the
insulating seat as a skirt.
[0018]
According to the present invention, the air chamber is formed between the insulating seat and
the fixed pole, and has an air chamber into which the velocity component is taken in from the
opening formed at the center of the insulating seat via the acoustic resistance material. In the
condenser microphone unit operating as directivity, the inner surface of the insulating seat side
forming the air chamber is a conical surface having the acoustic resistance material as a top and
the periphery of the insulating seat as a skirt. The velocity component taken into the air chamber
from the opening through the acoustic resistance material effectively acts on the entire back
surface of the diaphragm, and the directional frequency response can be made favorable.
[0019]
Sectional drawing which shows embodiment which applied this invention to the condenser
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microphone unit of a variable directivity.
The disassembled sectional view of the above-mentioned condenser microphone unit.
The graph which shows the directional frequency response of the said capacitor | condenser
microphone unit.
FIG. 2 is a cross-sectional view showing a variable directivity condenser microphone unit
according to the prior art.
The graph which shows the directional frequency response of the condenser microphone unit by
said prior art.
[0020]
Next, embodiments of the present invention will be described with reference to FIGS. 1 to 3, but
the present invention is not limited thereto.
In the description of this embodiment, the same reference numerals are used for components
which do not require any modification from the conventional example described with reference
to FIG.
[0021]
Referring to FIGS. 1 and 2, the condenser microphone unit according to this embodiment is a
variable directional condenser microphone unit which can select any of nondirectionality,
unidirectionality, and bidirectionality according to an applied voltage. It has an electrically
insulating insulating seat 15 made of synthetic resin, ceramics or the like, and first and second
capacitor elements 10 and 100 supported on both sides of the insulating seat 15 as a basic
configuration.
[0022]
Since capacitor elements 10 and 100 have the same configuration except that the arrangement is
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symmetrical, one first capacitor element 10 will be described here, and the other reference for
second capacitor element 100 will be the corresponding reference The sign is shown in
parentheses.
[0023]
The capacitor element 10 (100) includes a diaphragm 11 (110) stretched in a state in which a
predetermined tension is applied to the diaphragm ring 12 (120), and a fixed pole 14 (140). It is
constituted by arranging facing to each other.
A thin air layer corresponding to the thickness of the spacer ring 13 (130) is provided between
the diaphragm 11 (110) and the fixed electrode 14 (140).
[0024]
For the diaphragm 11 (110), a thin film of synthetic resin having a metal (preferably gold) vapor
deposition film on one side is used.
For the fixed pole 14 (140), a metal perforated plate having a large number of sound holes (holes
through which sound waves pass) is used.
In addition, an electret dielectric film may be provided on the fixed pole 14 (140).
[0025]
The capacitor element 10 (100) is fixed to the insulating seat 15 via the connection ring 17
(170) in a state where the resonator 16 (160) made of a metal plate is assembled on the front
side.
[0026]
In the resonator 16 (160), an acoustic terminal hole 16a (160a) for taking in a sound wave is
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formed, and an electrode terminal 19 (190) is attached.
The electrode terminal 19 (190) is electrically connected to the metal deposition film of the
diaphragm 11 (110) through the resonator 16 (160) and the diaphragm ring 12 (120) made of
metal.
[0027]
The insulating seat 15 is provided with an opening (communication hole) 151 at its central
portion, and both ends of the opening 151 are covered with acoustic resistance members 18 and
180.
A nylon mesh, a non-woven fabric, a sponge material having open cells, or the like may be used
as the acoustic resistance material 18, 180.
[0028]
Both sides of the insulating seat 15 are recessed, and an air chamber A1 (A2) for taking in the
velocity component via the acoustic resistance material 18 (180) between the fixed pole 14
(140) and the insulating seat 15 is provided. Although formed, in the present invention, the side
surface (the inner surface facing the fixed electrode 14 (140)) of the insulating seat 15 forming
the air chamber A1 (A2) has a specific shape as follows.
[0029]
In other words, the air chamber A1 (A2) is a speaker cone-shaped acoustic wave as conical
surfaces 152 and 152 having the side surfaces of the insulating seat 15 as the top and the
periphery of the insulating seat 15 as the bottom. Operate as a transformer.
[0030]
In FIG. 1, assuming that there is a sound source on the side of the first condenser element 10, the
velocity component of the collected sound wave is picked up by the diaphragm 110 of the
second condenser element 100 on the side of the rear acoustic terminal.
[0031]
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Then, the sound pressure of the velocity component due to the vibration of the diaphragm 110
vibrates the first capacitor element 10 through a path including the air chamber A2 → the
opening 151 having the acoustic resistance members 18 and 180 at both ends → the air
chamber A1. The inner surface of the air chamber A1 on the insulation seat 15 side acts on the
back surface of the plate 11, and the air chamber A1 operates as an acoustic transformer with
the conical surface 152, so the velocity component taken from the acoustic resistance material
18 at the top is a diaphragm It can be effectively applied to the entire back of the 11th.
[0032]
In FIG. 1, when the sound source is present on the side of the second capacitor element 100, the
air chamber A2 operates as an acoustic transformer like the air chamber A1.
[0033]
For reference, the directional frequency response when the variable directional condenser
microphone unit according to this embodiment is unidirective is shown in the graph of FIG. 3,
and the variable directional condenser microphone unit of the conventional example of FIG. The
directional frequency response in the case of directivity is shown in the graph of FIG.
From the comparison of the two graphs, it can be seen that according to the present invention,
the 180 ° directional frequency response is improved by about 6 dB as compared with the
conventional example.
[0034]
As described above, the variable directional capacitor microphone unit includes the first
unidirectional unit comprising the first capacitor element 10 and the second unidirectional unit
comprising the second capacitor element 100. The invention is also applicable to uni-directional
condenser microphone units consisting of uni-directional units on only one side thereof.
In that case, the opening 151 of the insulating seat 15 becomes a rear acoustic terminal.
[0035]
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DESCRIPTION OF SYMBOLS 10 1st capacitor | condenser element 100 2nd capacitor |
condenser element 11,110 Diaphragm 12,120 Diaphragm ring 13,13 Spacer ring 14,140 Fixed
pole 15 Insulating seat 151 Opening 152 Conical surface 16,160 Resonator 17,170 Connection
ring 18, 180 Sound resistance material A1, A2 Air chamber
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