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JP2014236261

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DESCRIPTION JP2014236261
Abstract: To provide a condenser microphone that increases the degree of freedom in circuit
board design. A unit case 1 holding a condenser microphone unit 2 and having a space 12
connected to the rear acoustic terminal 21 of the micro unit 2 and having an opening 13
connected to the space 12 formed in a peripheral wall, and the space 12 Volume conductive
member for reducing the volume of the space 12, a circuit board 4 disposed in the space 12 and
surrounded by the volume conductive member 3, and a rigid conductive member electrically
connecting the signal output end of the microphone unit 2 and the circuit board 4 And a body
15. The circuit board 4 is disposed in a posture crossing the central axis of the unit case 1, and
the rigid conductor 15 is slidably held with the volume limiting member 3 as a guide, or between
the rigid conductor 15 and the circuit board 4 or rigid An elastic conductor 16 is compressed
and interposed between the conductor 15 and the signal output end of the microphone unit 2.
[Selected figure] Figure 1
コンデンサマイクロホン
[0001]
The present invention relates to a condenser microphone capable of suppressing vibration of an
electronic circuit section even when used under high sound pressure and obtaining a high
frequency response and a high quality sound signal without incidental sound. .
[0002]
There is a microphone used under strong sound pressure in the vicinity of the instrument to pick
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1
up the instrument's playing sound.
As microphones used in the vicinity of a musical instrument, condenser microphones that are
easier to miniaturize than dynamic microphones are often used so as not to hinder the operation
of the performer or the visual field. The sound of a musical instrument picked up by a
microphone is often used for loudening (sometimes referred to as "PA") in a performance hall or
the like, and the directivity is often unidirectional. In the unidirectional condenser microphone,
an opening is provided on the side of the microphone case, and the opening is in communication
with the rear acoustic terminal of the condenser microphone unit. The above-mentioned opening
has a function of taking in the sound wave to the rear acoustic terminal of the condenser
microphone unit.
[0003]
Condenser microphones require electronic circuits, such as impedance converters, to lower the
output impedance of the microphone unit. This point is different from a dynamic microphone
that outputs a signal from both ends of a voice coil. The condenser microphone needs an
electronic circuit as described above, and needs to be made as small as possible. Therefore, a
circuit board on which electronic circuit components are mounted is incorporated near the rear
acoustic terminal of the microphone unit.
[0004]
When a condenser microphone having such a configuration is used in the vicinity of a musical
instrument or the like, a large sound pressure sound wave taken into the microphone case causes
the circuit board to vibrate. When the circuit board vibrates, the electronic circuit components
mounted on the circuit board vibrate, and incidental sounds other than the target sound to be
electroacoustically converted by the microphone unit are generated. When, for example, a film
capacitor is mounted on the circuit board, the film interval changes due to the vibration to
change the capacitance, which causes an incident sound. The capacitance changes due to the
vibration of the circuit board itself, which causes the generation of incidental noise. Since these
incidental sounds cause deterioration in sound quality, it is desirable to prevent electronic circuit
components from being vibrated by sound waves.
[0005]
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In the microphone unit case (hereinafter simply referred to as unit case ), there is a space
behind the rear acoustic terminal of the microphone unit leading to the opening of the unit case,
and the circuit board on which the above electronic circuit components are mounted I have
stored it. Since the space operates as an acoustic capacity, resonance occurs between the acoustic
mass of the space and the opening of the unit case. This resonance degrades the frequency
response of the microphone. If the volume of the space is large, the storage of the electronic
circuit component and the circuit board on which the electronic circuit component is mounted is
easy, but the impedance of the acoustic capacity is low, and resonance easily occurs in the main
sound collection frequency band.
[0006]
Therefore, to increase the impedance of the acoustic capacitance, it is necessary to reduce the
volume of the space. By reducing the volume of the space, the impedance of the acoustic
capacitance is increased, and the resonant frequency of the space is increased. Thus, if the
resonant frequency of the space is made higher than the upper limit of the main sound collecting
frequency band, the directional frequency response does not deteriorate in the frequency band
lower than the resonant frequency.
[0007]
There is known a condenser microphone in which a filling member functioning as an acoustic
resistance is disposed in the space to prevent resonance of the space of the microphone case
formed behind the rear acoustic terminal of the condenser microphone unit (see Patent
Document 1). ). The filling member used in the condenser microphone described in Patent
Document 1 is a plastic sintered body having innumerable continuous pores, and is disposed in
the space of the microphone case. The filling member functions as an acoustic resistance to the
sound wave entering the space from the opening of the side surface of the microphone case, and
prevents the resonance of the space.
[0008]
According to the invention described in Patent Document 1, the resonance prevention effect of
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the internal space of the microphone case is recognized. However, the invention described in
Patent Document 1 does not arrange the electronic circuit unit in the internal space of a small
volume of the microphone case, but prevents the electronic circuit unit from being vibrated by
the sound wave entering the microphone case. It is not a thing.
[0009]
Therefore, the inventor of the present invention has a condenser microphone unit, and a
microphone case which has a space connected to the rear acoustic terminal of the condenser
microphone unit and is formed on a peripheral wall and has an opening connected to the space.
A volume limiting member disposed in the space of the microphone case to reduce the volume of
the space; and an electronic circuit portion disposed in the space of the microphone case and
surrounded by the volume limiting member. And the volume limiting member also serves as a
shielding member for shielding the sound wave entering the space from the opening of the
microphone case from reaching the electronic circuit portion. , Previously filed a patent
application (Japanese Patent Application 2012-148150 Irradiation).
[0010]
According to the invention of the above patent application, the volume of the space of the
microphone case connected to the rear acoustic terminal of the microphone unit and the opening
of the microphone case becomes small, and the space is less likely to resonate, and good
frequency response characteristics can be obtained. .
Even if a large sound pressure sound wave enters the inside of the microphone case, the volume
restricting member shields the electronic circuit portion from reaching, so that there is also an
effect that generation of incidental sound due to vibration of the electronic circuit component is
eliminated.
[0011]
JP, 2011-9807, A
[0012]
In the embodiment of the condenser microphone described in the specification and drawings of
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the above patent application, one end of the circuit board on which the electronic circuit
component is disposed protrudes outward of the volume limiting member.
Then, one end of the circuit board is electrically connected to the signal output end of the
microphone unit through the conductive holding member. Therefore, it is necessary to make a
part of the circuit board project outward from the volume limiting member, which has a problem
that the degree of freedom in design is limited.
[0013]
An object of the present invention is to further improve the invention according to the above
patent application, and to provide a condenser microphone capable of enhancing the design
freedom of a circuit board on which electronic circuit components are disposed.
[0014]
A condenser microphone according to the present invention comprises: a condenser microphone
unit; a unit case which holds the condenser microphone unit and has a space connected to the
rear acoustic terminal of the condenser microphone unit and an opening connected to the space
is formed in a circumferential wall A volume limiting member disposed in the space of the unit
case to reduce the volume of the space by partitioning the space; and a volume limiting member
disposed in the space partitioned by the volume limiting member of the unit case And a rigid
conductor electrically connecting the signal output end of the condenser microphone unit and
the circuit board, wherein the circuit board has a substrate surface at the center of the unit case.
The rigid conductor is disposed in a posture crossing the axis, The elastic conductor is
compressed and interposed between the rigid conductor and the circuit board or between the
rigid conductor and the signal output end of the condenser microphone unit while being slidably
held with the volume limiting member as a guide. The most important feature is what you are
doing.
[0015]
Since the volume limiting member reduces the volume of the space in the unit case, the space is
less likely to resonate, and good frequency response characteristics can be obtained.
Even if a large sound pressure sound wave enters the unit case, the volume restriction member
shields the sound pressure from reaching the circuit board, thereby eliminating the generation of
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incidental sound due to the vibration of the electronic circuit component.
Since the electrical connection between the microphone unit and the circuit board is made via a
slidable rigid conductor, the circuit board does not require a special structure for conduction
with the rigid conductor, and the circuit board design Upper freedom is increased.
[0016]
It is a longitudinal section showing an example of a condenser microphone concerning the
present invention. It is a disassembled longitudinal cross-sectional view which shows the
principal part of the said Example.
[0017]
Hereinafter, an embodiment of a condenser microphone according to the present invention will
be described with reference to FIG. 1 and FIG.
[0018]
In FIGS. 1 and 2, reference numeral 1 denotes a microphone unit case.
The unit case 1 has a substantially cylindrical case main body 11 and a head case 23 which is
put on the tip opening of the case main body 11. The inside of the case body 11 is a space 12.
The condenser microphone unit 2 is housed in the head case 23. Condenser microphone unit 2
holds diaphragm 18 which vibrates upon receiving a sound wave, fixed pole 20 oppositely
disposed with a predetermined gap between diaphragm 18 and these members in head case 23
An insulating support 24 is provided. An appropriate number of openings 13 are formed in the
peripheral wall of the case main body 11, the space 12 in the case main body 11 communicates
with the opening 13, and the space 12 is open to the outside of the microphone from the
opening 13. The directivity of the condenser microphone unit 2 is unidirectional.
[0019]
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The vibrating plate 18 and the fixed electrode 20 constitute a capacitor, and when the vibrating
plate 18 vibrates, the capacitance of the capacitor is changed to perform electroacoustic
conversion. An opening 19 for introducing a sound wave to the microphone unit 2 is formed in
the head case 23. The opening 19 is a front acoustic terminal. The counter electrode 20 is
formed with an appropriate number of holes penetrating the counter electrode 20 in the
thickness direction to communicate the back side space of the diaphragm 18 to the outside of the
microphone unit 2, and these holes are rear acoustic terminals 21 constitute. The space 12 inside
the case body 11 communicates with the rear acoustic terminal 21 and also communicates with
the opening 13 as described above.
[0020]
Inside the case body 11, the circuit board 4 is fixed so that the board surface, that is, the
mounting surface of the electronic circuit component is directed in a direction crossing the
central axis of the case body 11, more specifically, in a direction orthogonal to the center line.
ing. The inside of the case body 11 is divided into upper and lower parts by the circuit board 4 in
FIGS. 1 and 2. Of the inside of the case body 11 divided into two, the upper inside is the space
12. On the circuit board 4, a volume limiting member 3 formed in a hemispherical shape is
disposed in a posture of projecting upward. The outer periphery of the volume limiting member
3 is closely fixed to the upper surface of the circuit board 4 by screwing the set screw
penetrating the outer peripheral edge of the volume limiting member 3 and the circuit board 4
into the flat support portion of the case main body 11 There is. In order to improve the
airtightness of the internal space of the volume limiting member 3, it is preferable to interpose a
sealant that seals a gap between the outer peripheral edge of the volume limiting member 3 and
the circuit board 4.
[0021]
With the above configuration, a hemispherical sealed space surrounded by the circuit board 4
and the volume limiting member 3 is formed. The volume limiting member 3 divides the space
12, and the enclosed space occupies a large volume of the space 12 to reduce the volume of the
space 12. The volume limiting member 3 is also formed in a size not to shield the opening 13 of
the case main body 11, and the volume limiting member 3 surrounds the circuit component
mounting surface of the circuit board 4.
[0022]
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The volume limiting member 3 has a cylindrical guide portion 31 at its central portion. The guide
portion 31 is integrally formed along the central axis of the volume limiting member 3. The rodshaped rigid conductor 15 is held by the guide portion 31. The rigid conductor 15 can slide
along the central axis of the volume limiting member 3 and in the longitudinal direction of the
rigid conductor 15 using the guide portion 31 as a guide. The rigid conductor 15 is cylindrical
and both ends in the longitudinal direction are hemispherical.
[0023]
The rigid conductor 15 electrically connects the fixed electrode 20, which is a signal output end
of the condenser microphone unit 2, and a predetermined electrode pattern of the circuit board
4. An elastic conductor 16 made of, for example, a conductive cloth is compressed and
interposed between the rigid conductor 15 and a predetermined electrode pattern of the circuit
board 4. Therefore, the rigid conductor 15 is urged toward the fixed electrode 20 by the
repulsive force of the elastic conductor 16, and electrically and securely connects the fixed
electrode 20 and the predetermined electrode pattern of the circuit board 4. The elastic
conductor 16 may be interposed between the rigid conductor 15 and the signal output end of the
condenser microphone unit, or may be disposed at both ends of the rigid conductor 15. A recess
22 for receiving the rigid conductor 15 is formed at the center of the fixed electrode 20 with
which the upper end of the rigid conductor 15 is in contact.
[0024]
The material of the volume limiting member 3 is a material that is electrically insulating and
difficult to pass sound waves. Although resin, more specifically, polycarbonate (PC) material is
used in this embodiment, other equivalent materials may be used. In order to hold the rigid
conductor 15 slidably, a minute gap is generated between the outer peripheral surface of the
rigid conductor 15 and the inner peripheral surface of the guide portion 31. When a sound wave
from the outside enters the internal space of the volume limiting member 3 through the gap, the
circuit component of the circuit board 4 is vibrated, so the sealing material is interposed in the
gap to seal the gap. Instead of the sealing material, a lubricant such as a sealant or grease may be
interposed.
[0025]
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The electronic circuit components mounted on the circuit board 4 constitute a processing circuit
for outputting an output signal of the condenser microphone unit 2 as a microphone output
signal. More specifically, the electronic circuit unit 5 includes an FET for converting the output
impedance of the condenser microphone unit 2, and as necessary, includes a buffer amplifier, a
signal processing circuit for balanced output, and the like. The diaphragm 18 constitutes the
other electrode for outputting the signal of the microphone unit. The diaphragm 18 is electrically
connected to a predetermined circuit pattern formed on the circuit board 4 through the unit case
1.
[0026]
The volume limiting member 3 not only reduces the volume of the space 12 but also serves as a
shielding member for shielding sound waves, and the sound waves entering the space 12 from
the opening 13 reach the electronic circuit components of the circuit board 4 It also works to
shield the The volume limiting member 3 also serves as a damping member of the circuit board
4.
[0027]
The lower half of the case body 11 of the unit case 1 is a cylindrical portion 32. An intermediate
cylinder 42 is positioned on the outer peripheral side of the cylindrical portion 32 at a constant
interval, and the upper and lower portions of the cylindrical portion 32 are connected to the
intermediate cylinder 42 via dampers 41 and 43, respectively. A cylindrical interposing member
44 forming a part of the microphone case is positioned on the outer peripheral side of the
intermediate cylinder 42 at a predetermined distance from the outer periphery of the
intermediate cylinder 42, and the interposition of the dampers 41 and 43 is The intermediate
cylinder 42 and the interposing member 44 are coupled to each other. The interposing member
44 is configured to be connectable to a cylindrical grip (not shown) that constitutes another part
of the microphone case. Thus, the unit case 1 is buffered by the interposition of the dampers 41
and 43 and incorporated in the microphone case.
[0028]
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The front mesh 45 is attached to the interposing member 44. The front mesh 45 is placed on the
condenser microphone unit 2 and the unit case 1 at an appropriate interval. In the illustrated
embodiment, the front mesh 45 is attached to the interposing member 44 by screwing a female
screw formed on the inner periphery of the front mesh 45 into an external thread formed on the
outer periphery of the interposing member 44. The front mesh 45 can pass sound waves from
the outside.
[0029]
According to the embodiment of the condenser microphone described above, a large volume of
the space 12 inside the unit case 1 to which the rear acoustic terminal 21 of the condenser
microphone unit 2 communicates is occupied by the volume restriction member 3. As a result,
the volume of the space 12 is reduced, resonance of the space 12 is unlikely to occur, and the
resonance frequency is increased even if resonance occurs. Therefore, good frequency response
can be obtained in the general voice frequency band.
[0030]
Further, the volume limiting member 3 also serves as a shielding member that shields the sound
wave entering the space 12 from the opening 13 of the unit case 1 from reaching the circuit
board 4. Even if the sound wave of high sound pressure enters the space 12, the volume
restriction member 3 can block the sound wave of high sound pressure entering the electronic
circuit component mounted on the circuit board 4. Therefore, it is possible to prevent the
vibration of the electronic circuit component due to the sound wave of the large sound pressure,
and it is possible to obtain the condenser microphone with high sound quality without generating
the incidental sound due to the vibration of the electronic circuit component.
[0031]
Since the signal output end of the microphone unit 2 and the circuit board 4 are electrically
connected by the rigid conductor 15 slidably held by the volume limiting member 3, the
electrical connection structure of the circuit board 4 is a special structure do not have to.
Therefore, the design freedom of the circuit board 4 on which the electronic circuit component is
disposed can be enhanced. In addition, the elastic conductor 16 is compressed and interposed
between the rigid conductor 15 and the circuit board 4 or between the rigid conductor 15 and
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the signal output end of the microphone unit 2, whereby the microphone unit 2 and the circuit
board 4 are provided. It is possible to make an electrical connection with
[0032]
Since the elastic conductor 16 is interposed between the rigid conductor 15 and the signal
output end of the circuit board 4 or the microphone unit 2, the above-mentioned signal output
end is obtained even if the rigid conductor 15 or the like has dimensional variations. And the
circuit board 4 can be reliably conducted. By compressing and interposing the elastic conductor
16 between the rigid conductor 15 and the signal output end of the circuit board 4 or the
microphone unit 2, it is possible to suppress the vibration of the circuit board 4 or the like.
[0033]
In the illustrated embodiment, the case body 11 constituting the unit case 1 and the head case
23 are connected by the engagement of male and female screws, and as described above, the
front mesh 45 is attached to the interposing member 44 with male and female screws. Are
connected by the fitting of In this way, since the head case 23 can be easily attached to and
detached from the unit case 1 with the front mesh 45 removed from the interposing member 44,
the microphone unit 2 can be easily replaced. By replacing the microphone unit 2, the electrical
connection relationship between the microphone unit 2 and the circuit board 4 is not broken,
and the connection relationship can be maintained simply by mounting the microphone unit 2 on
the unit case 1.
[0034]
The condenser microphone according to the present invention can obtain an audio signal with
high sound quality even if a sound wave of high sound pressure enters, and is particularly
suitable as a microphone used in the vicinity of a musical instrument that emits a large sound.
However, the present invention is not limited to use under a large sound, and can be used under
any conditions, and has the advantage that the sound quality is not impaired even if a sound
wave of a large sound happens to enter.
[0035]
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DESCRIPTION OF SYMBOLS 1 unit case 2 capacitor microphone unit 3 volume restriction
member 4 circuit board 11 case main body 12 space 13 opening 15 rigid conductor 16 elastic
conductor 18 diaphragm 20 fixed electrode 21 rear acoustic terminal 23 head case 24 insulating
support 31 guide portion
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