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DESCRIPTION JP2008177697

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DESCRIPTION JP2008177697
The present invention provides a condenser microphone unit having a structure capable of
preventing in advance the problem of displacement of a damper in a process of fitting a fixed
pole to an insulating seat, and a condenser microphone using the same. A condenser microphone
unit 10 is disposed in a unit case 11 so as to face a diaphragm 13 and the diaphragm with a gap
therebetween, and the fixed pole 15 constituting a capacitor with the diaphragm, and Insulating
seat 16 disposed on the rear surface side of the fixed pole and supporting the fixed pole, an
annular acoustic resistance member 17 disposed on the front side of the insulating seat, the
acoustic resistance member from the front side to the insulating seat An annular damper 18 to
be pressed is at least incorporated and configured, and a fixing member 19 is further provided
which presses the damper 18 from the front side. [Selected figure] Figure 1
Condenser microphone unit and condenser microphone
[0001]
The present invention relates to a condenser microphone unit and a condenser microphone, and
more particularly to a technology for improving the variation in the value of acoustic resistance
that controls the directivity of a condenser microphone.
[0002]
The condenser microphone includes a condenser microphone unit that constitutes a type of
condenser in which a diaphragm that vibrates by sound waves and a fixed pole (also called a
“back pole”) are disposed opposite to each other via a spacer.
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The condenser microphone unit is assembled in a unit case, and further includes an FET (field
effect transistor) as an impedance converter and a circuit board on which the FET is mounted.
[0003]
In such a condenser microphone, there are mainly the following two methods of forming an
acoustic resistance that limits the sound wave guided to the diaphragm to impart desired
directivity. One of them is to arrange a plate connected to a diaphragm via a spacer with respect
to an insulating seat, and to form an acoustic resistance by a thin air layer corresponding to the
thickness of the spacer between the insulating seat and the plate. is there. The other is to dispose
the acoustic resistance member and a plate coupled to the diaphragm on the acoustic resistance
member so as to cover the sound communication hole with respect to the insulating seat.
[0004]
In condenser microphones provided with acoustic resistance such as the former, several means
for improving directivity have been proposed (see, for example, Patent Documents 1 and 2). In
addition, in the condenser microphone provided with such an acoustic resistance as the latter,
means for improving directivity is also proposed (see, for example, Patent Document 3).
[0005]
The basic configuration of the condenser microphone unit in the condenser microphone provided
with the above-mentioned acoustic resistance is as shown in FIG. In FIG. 5, the condenser
microphone unit 110 is configured by housing the following components in a cylindrical unit
case 111 with a bottom. The unit case 111 has a portion corresponding to the bottom portion
111a on the front side, and the bottom portion 111a is formed with a plurality of holes 122 for
introducing sound into the unit. In the unit case 111, a ring-shaped diaphragm holder 112 and
an outer peripheral edge are fixed to one end face of the diaphragm holder at a position closest
to the bottom 111a of the unit case 111 via the dustproof member 125. The diaphragm 113 is
disposed. Further, a fixed electrode 115 is disposed opposite to the diaphragm 113 via a spacer
114 which is a ring-shaped member. A gap corresponding to the thickness of the spacer 114 is
formed between the vibrating plate 113 and the fixed electrode 115 to constitute a kind of
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capacitor. Then, as the diaphragm 113 vibrates according to the sound introduced through the
hole 122, the capacitance of the capacitor changes, and the change of the capacitance is output
as a sound signal.
[0006]
In the unit case 111, an insulating seat, which is a fixed electrode support, is disposed on the rear
surface side of the fixed electrode 115. Insulating seat 116 is made of, for example, a synthetic
resin, and a circular recess is formed on the front side. The fixed pole 115 is fitted in this
recessed portion. A ring-shaped recess is also formed on the inner peripheral side of the recess in
the recess, and the ring-shaped acoustic resistance member 117 and the resilient damper 118
are fitted in the ring-shaped recess. It is done. A disc-shaped printed circuit board 121 is
disposed on the rear surface side of the insulating seat 116 and abuts on the outer peripheral
edge thereof. A folded portion 123 of the open end of the unit case 111 is located at the outer
periphery of the rear surface of the printed circuit board 121. The printed circuit board 121 is
pushed forward (upward in FIG. 5) by the pressing force of the folded portion 123. The insulating
sheet 116 is pushed by this pressing force, the fixed pole 115 is pushed through the damper
118, and the diaphragm 113 and the diaphragm holder 112 are further pressed against the
bottom surface 111a of the unit case 111 through the spacer 114. The respective members are
positioned and fixed in the unit case 111, respectively.
[0007]
A hole is formed in the central portion of the insulating seat 116 in the thickness direction, and
the small diameter portion of the contact 119 which is made of a metal such as copper and
whose diameter is different stepwise is fitted in this hole. On the printed circuit board 121, a field
effect transistor (hereinafter referred to as "FET") 120 constituting an impedance converter is
disposed at a position facing the contact 119. A part of the terminal 120 a of the FET 120 is bent
along the exterior of the FET 120 and abuts on the lower surface 119 b of the contact 119. On
the other hand, one of the other terminals 120 b is connected to a predetermined circuit pattern
of the printed circuit board 121 by soldering or the like. A coiled contact spring 124 is
compressed and disposed on the outer peripheral side of the upper end portion 119 a of the
contact 119. The contact spring 124 is interposed between the fixed pole 115 and the contact
119 and biases the contact 119 and the fixed pole 115 in a direction away from each other. By
this biasing force, the contact 119 is pressed against one of the terminals 120a of the FET 120,
and electrical conduction between the terminal 120a and the fixed electrode 115 is established.
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[0008]
In the condenser microphone unit 110 described above, the acoustic resistance member 117 is
pressed against the insulating seat 116 by the damper 118 to realize stable and non-uniform
acoustic resistance. Therefore, when the condenser microphone unit 110 is assembled, the
acoustic resistance member 117 and then the damper 118 are placed on the insulating seat 116,
and then the fixed pole 115 is fitted to the insulating seat 116. Thus, the damper 118 can be
sandwiched between the fixed pole 115 and the insulating seat 116 to apply a stable pressure to
the acoustic resistance member 117.
[0009]
However, as shown in FIG. 6, after the acoustic resistance member 117 is placed on the
insulating seat 116 and the damper 118 is placed on the acoustic resistance member 117, the
fixed electrode 115 is press-fit into the insulating seat 116 and both are fitted. There is a
disadvantage that the position of the damper 118 is shifted in the process of As a result, the
peripheral portion 118 a of the damper 118 may be pinched to the portion (fitting) where the
fixed pole 115 of the insulating seat 116 abuts. Therefore, the fixed pole 115 is attached in a
state of being inclined with respect to the insulating seat 116, resulting in a defect in sensitivity
and frequency response. In addition, since the acoustic resistance member 117 can not be
sufficiently pressed against the insulating seat 116, the acoustic resistance value becomes
inappropriate, resulting in a failure of the directional frequency response.
[0010]
Furthermore, in the condenser microphone, in order to ensure the electrical connection between
the fixed pole and the FET, a means using a ribbon wire has also been proposed (see, for
example, Patent Document 4). However, when electrically connecting a conductive part for
drawing out a signal from a fixed pole and the fixed pole with a contact spring or ribbon wire for
electrical connection, it is difficult to assemble because they are all small parts. In addition, since
the contact portion with the component is small, contact failure may easily occur if the contact
portion has a film such as oil and fat or an adhesive. Japanese Utility Model Application
Publication No. 59-76200 Japanese Utility Model Application Publication No. 63-187500
Japanese Utility Model Application Publication No. 7-29996 Patent Document Japanese Utility
Model Application Publication No. 4-50995
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[0011]
The present invention has been made in view of the above circumstances, and has used a
condenser microphone unit having a structure capable of preventing in advance the problem that
the damper is displaced in the step of fitting the fixed pole to the insulating seat. It aims at
providing a condenser microphone. Another object of the present invention is to provide a
condenser microphone unit capable of reliably connecting the fixed pole and the FET electrically,
and a condenser microphone using the same.
[0012]
A condenser microphone unit according to claim 1 of the present invention comprises a
diaphragm, a fixed pole which is disposed opposite to the diaphragm with a gap, and which
constitutes a capacitor with the diaphragm in a unit case. An insulating seat disposed on the rear
surface side of the fixed electrode and supporting the fixed electrode, an annular acoustic
resistance member disposed on the front surface side of the insulating seat, and an annular
member pressing the acoustic resistance member against the insulating seat from the front
surface side A condenser microphone unit including at least the damper according to claim 1,
further comprising: a fixing member configured to press the damper from the front side.
[0013]
A condenser microphone unit according to a second aspect of the present invention is
characterized in that in the first aspect, the fixing member is attached to the insulating seat.
[0014]
A condenser microphone unit according to a third aspect of the present invention is
characterized in that, in the first or second aspect, the fixing member presses the inner
peripheral edge portion of the damper.
[0015]
A condenser microphone unit according to a fourth aspect of the present invention is
characterized in that, in any one of the first to third aspects, the fixing member has conductivity.
[0016]
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The condenser microphone unit according to a fifth aspect of the present invention is
characterized in that, in the fourth aspect, the fixing member has a convex portion exposed from
the rear surface side of the insulating seat.
[0017]
A condenser microphone unit according to claim 6 of the present invention is characterized in
that, in any one of claims 1 to 5, the damper has conductivity.
[0018]
According to a seventh aspect of the present invention, there is provided a condenser
microphone comprising the condenser microphone unit according to any one of the first to sixth
aspects.
[0019]
According to the condenser microphone unit of the present invention, the fixing member is
provided with the annular damper which is pressed from the front side and temporarily fixed
before the fixing pole is fitted to the insulating seat.
Therefore, the annular acoustic resistance member disposed on the front side of the insulating
seat is pressed against the insulating seat by the damper, and the damper is reliably pressed by
the fixing member.
As a result, the possibility that the damper is displaced due to external impact or the like is
reduced, and the fixed pole is not attached to be inclined with respect to the insulating seat, and
the acoustic resistance against the insulating seat is reduced. The members can be pressed
sufficiently.
Therefore, it is possible to provide a condenser microphone unit having a structure capable of
preventing in advance the problem of displacement of the damper in the step of fitting the fixed
pole to the insulating seat, and a condenser microphone using the same.
[0020]
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Further, by mounting the fixing member to the insulating seat, the damper can be reliably
supported so as not to be separated from the insulating seat.
Therefore, after the damper is pressed by the fixing member, it is possible to further enhance the
pressing effect of the damper on the insulating seat and the displacement preventing effect of the
damper.
[0021]
Further, by pressing the inner peripheral edge portion of the damper, the fixing member can
press the damper against the insulating seat while being guided by the fixing member.
Therefore, the effect of preventing the displacement of the damper can be further enhanced.
Moreover, since the dimension in the width direction can be made smaller than that of the
damper, the structure is not bulky, and the material cost can be suppressed.
[0022]
Further, since the fixing member has conductivity, the fixing pole and the fixing member can be
electrically connected, and the fixing member can be electrically connected to the FET.
Therefore, the electrical connection between the fixed pole and the FET through the fixing
member can be effectively and simply and surely performed together with the prevention of the
displacement of the damper.
[0023]
In addition, the fixing member can have a direct electrical connection with the FET by having a
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convex portion exposed from the rear surface side of the insulating seat. Therefore, the electrical
connection between the fixing member and the FET can be reliably made, and the electrical
connection between the stationary pole and the FET can be enhanced.
[0024]
Furthermore, since the damper has conductivity, the fixed pole and the damper can be
electrically connected, and the damper and the fixing member can be electrically connected.
Therefore, the electrical connection between the fixed pole and the fixing member can be more
reliably made through the damper, and the electrical connection between the fixed pole and the
FET can be made more reliably.
[0025]
And, by providing the condenser microphone unit according to any one of claims 1 to 6, the
sensitivity and the frequency response do not deteriorate, and the electrical connection between
the fixed pole and the FET is ensured. It is possible to provide a condenser microphone that can
be implemented.
[0026]
Hereinafter, the present invention will be described in detail based on the drawings.
FIG. 1 is a longitudinal sectional view showing an example of the condenser microphone unit of
the present invention, and FIG. 2 is a developed view for explaining the structure of the main
components. As shown in FIG. 1, the condenser microphone unit 10 of the present embodiment
includes at least a diaphragm 13, a fixed electrode 15, an insulating seat 16, an acoustic
resistance member 17, and a damper 18 in a unit case 11. It is characterized in that it comprises
a fixing member 19 which is incorporated and configured to further press the damper 18 from
the front side.
[0027]
The unit case 11 has a cylindrical shape with a bottom, and a portion corresponding to the
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bottom 11 a is on the front side. Further, the bottom 11a of the unit case 11 is formed with a
plurality of holes 22 for introducing voice into the unit. The holes 22 may be a so-called front
mesh obtained by meshing the holes. Unit case 11 can be formed, for example, by drawing.
[0028]
The diaphragm 13 has an outer peripheral edge fixed to one end face of the ring-shaped
diaphragm support 12 and is disposed at a position closest to the bottom of the unit case 11 via
a dustproof member 25.
[0029]
The fixed pole 15 is disposed opposite to the vibrating plate 13 via a spacer 14 which is a ringshaped member.
A gap corresponding to the thickness of the spacer 14 is formed between the diaphragm 13 and
the fixed electrode 15 to constitute a kind of capacitor. In addition, the fixed electrode 15 uses,
for example, a metal disk-shaped member as a base material, and an electret plate is attached to
the opposite surface side to the diaphragm 13 on at least one surface side to constitute an
electret board . The spacer 14 is a ring-shaped member made of a thin resin, and is in close
contact with the outer peripheral edge of the rear end surface (lower end surface in FIG. 1) of the
diaphragm. Then, as the diaphragm 13 vibrates according to the sound introduced through the
hole 22, the capacitance of the capacitor changes, and the change of the capacitance is output as
an audio signal.
[0030]
The insulating seat 16 is a fixed electrode support which is disposed on the rear side of the fixed
electrode 15 and supports the fixed electrode 15. The insulating seat 16 is made of, for example,
an insulator such as a resin, and the shape of the outer periphery is cylindrical. In addition, a
circular first recessed portion 16a is formed on the front side, and the fixed pole 15 is fitted in
the first recessed portion 16a. Further, a ring-shaped second concave portion 16b is formed on
the inner peripheral side of the first concave portion 16a in the first concave portion 16a. The
acoustic resistance member 17 and the damper 18 are fitted in the ring-shaped second recessed
portion 16b. Further, a hole 16c is formed in the central portion of the insulating seat 16 in the
thickness direction, and the fixing member 19 is fitted in the hole 16c.
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[0031]
The acoustic resistance member 17 controls the damping and directivity of the acoustic
mechanical system, and is disposed on the front side of the insulating seat 16. The shape of the
acoustic resistance member 17 is annular. Further, the acoustic resistance may be set so that the
acoustic resistance of the acoustic resistance member 17 is ten times or more that of the damper
18.
[0032]
The damper 18 is a member that presses the acoustic resistance member 17 against the
insulating seat 16 from the front side. The damper 18 is elastic and has an annular shape.
Further, since the damper 18 is in contact with the fixed pole 15 and the fixed member 19, it is
preferable that the damper 18 be a conductive cloth having conductivity. Thus, when the damper
18 has conductivity, as shown in FIG. 3, electrical connection is enabled in the α region of the
damper 18 in contact with the fixed pole 15. Then, the electrical connection between the fixed
pole 15 and the fixed member 19 can be made more reliably through the damper 18.
[0033]
The fixing member 19 is a member that presses the damper 18 from the front side. As a result,
the possibility that the damper 18 is displaced may be reduced. Therefore, the fixed pole 15 is
not attached to be inclined with respect to the insulating seat 16, and the acoustic resistance
member 17 can be sufficiently pressed against the insulating seat 16. Preferably, the fixing
member 19 is attached to the insulating seat 16. When the fixing member 19 is attached to the
insulating seat 16 as described above, the damper 18 can be reliably supported so as not to be
undisturbed from the insulating seat 16. Then, the pressing effect of the damper 18 against the
insulating seat 16 and the positional shift preventing effect of the damper 18 can be further
enhanced.
[0034]
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Further, it is preferable that the fixing member 19 hold the inner peripheral edge portion of the
damper 18 as shown in the illustrated example. The location for pressing the damper 18 may not
be the entire inner peripheral edge, but may be at least a part. For example, the fixing member
19 may have a collar 19 a protruding outward at the upper end peripheral portion. Then, the
inner peripheral edge portion of the damper 18 can be pressed by the flange portion 19 a of the
fixing member 19. When the inner peripheral edge portion of the damper 18 is pushed by the
flange portion 19a in this manner, as shown in FIG. 4, the damper 18 is guided by the fixing
member 19 while the damper 18 is rotated by the flange portion 19a. Press the inner rim. Then,
the acoustic resistance member 17 can be sufficiently pressed against the insulating seat 16 by
the damper 18.
[0035]
The fixing member 19 is in contact with the fixed electrode 15 and a field effect transistor
(hereinafter referred to as “FET”) 20 described later. Therefore, it is preferable that the fixing
member 19 be made of a conductive metal material such as copper or stainless steel, a
conductive resin material mixed with a conductive material, or the like. Thus, when the fixing
member 19 has conductivity, as shown in FIG. 3, electrical connection can be made in the β
region of the fixing member 19 in contact with the fixing pole 15. Then, the electrical connection
between the fixed pole 15 and the FET 20 can be made more reliably through the fixing member
19. Therefore, the fixing member 19 can effectively and simply and electrically connect the fixed
pole 15 and the FET 20 together with preventing the displacement of the damper 18.
[0036]
Furthermore, it is preferable that the fixing member 19 have a convex portion 19 b exposed from
the rear surface side of the insulating seat 16. Thus, when the fixing member 19 has the convex
portion 19 b, as shown in FIG. 4, the convex portion 19 b can be fitted into the hole 16 c formed
in the central portion of the insulating seat 16. Then, the convex portion 19 b is exposed from
the rear surface side of the insulating seat 16, and the fixing member 19 can be electrically
connected directly and easily to the FET 20, and the connection can be surely performed.
[0037]
Further, a disc-shaped printed circuit board 21 is disposed on the rear surface side of the
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insulating seat 16, and the insulating seat 16 and the printed circuit board 21 are in contact with
each other at the outer peripheral edge portion. The folded portion 23 of the open end of the
unit case 11 is located at the outer peripheral edge of the rear surface of the printed circuit
board 21. The printed circuit board 21 is pushed forward (upward in FIG. 1) by the pressing
force of the folded portion 23. Further, the insulating seat 16 is pushed by the pressing force,
and the fixed pole 15 is pushed through the damper 18. Furthermore, the diaphragm 13 and the
diaphragm holder 12 are pressed against the bottom surface 11 a of the unit case 11 through
the spacer 14. Therefore, these members are respectively positioned and fixed in the unit case
11.
[0038]
On the printed circuit board 21, an FET 20 constituting an impedance converter is disposed at a
position facing the fixing member 19. A part of the terminal 20 a of the FET 20 is bent along the
exterior of the FET 20 and abuts on the lower surface convex portion 19 b of the fixing member
19. That is, the fixing member 19 is pressed against one terminal 20 a of the FET 20 by being
fitted into the hole 16 c formed in the central portion of the insulating seat 16, and electrical
conduction between the terminal 20 a and the fixing pole 15 is obtained. It is taking. On the
other hand, the other terminal 20 b of the FET 20 is connected to a predetermined circuit pattern
of the printed circuit board 21 by soldering or the like.
[0039]
The condenser microphone unit 10 described above is configured to be able to prevent in
advance the inconvenience that the damper 18 is displaced by using the fixing member 19. As a
result, the acoustic resistance member 17 is sufficiently pressed against the insulating seat 16,
and stable acoustic resistance without variation is realized. Therefore, when the condenser
microphone unit 10 is assembled, the acoustic resistance member 17 and then the damper 18
are mounted on the insulating seat 16, and then the damper 18 is temporarily fixed by the fixing
member 19. Then, the fixed electrode 15 is press-fit into the insulating seat 16 to fit them
together. As a result, the damper 18 is sandwiched between the fixed pole 15 and the insulating
seat 16 without being inclined, held in the correct posture, and a stable pressure can be applied
to the acoustic resistance member 17. Moreover, the cost per part for the fixing member 19 is
low, and the assembly process of the condenser microphone unit 10 can be facilitated.
[0040]
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In addition, by incorporating the condenser microphone unit having such a structure into a
microphone case provided with a windshield, a condenser microphone that does not cause a
defect in sensitivity and frequency response, and an electrical connection between a fixed pole
and an FET It is possible to provide a condenser microphone that can be reliably connected.
[0041]
It is a vertical side view showing an example of a condenser microphone unit concerning the
present invention in a simplified manner.
It is an exploded view explaining the structure of the main structure parts of the condenser
microphone unit shown in FIG. It is a longitudinal cross-sectional view explaining the electrical
connection condition of a fixed pole, a fixing member, and a damper. It is a longitudinal crosssectional side view explaining how to hold | suppress the damper by a fixing member. It is a
vertical side view which briefly shows an example of the conventional condenser microphone
unit. It is a vertical side view which briefly shows an example of the conventional condenser
microphone unit.
Explanation of sign
[0042]
DESCRIPTION OF SYMBOLS 10 capacitor microphone unit 11 unit case 12 diaphragm support
13 diaphragm 14 spacer 15 fixed pole 16 insulation seat 17 acoustic resistance member 18
damper 19 fixing member 20 field effect transistor (FET) 21 printed circuit board
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