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JPH11275677

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DESCRIPTION JPH11275677
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic-electric conversion device such as a microphone, in particular a dynamic microphone.
[0002]
2. Description of the Related Art A dynamic microphone for vocals, which is a kind of
microphone as an acoustic-electric conversion device, is generally used by hand and is
configured as a unidirectional microphone, Sound pressure from the outside is applied to a part
of the rear side of the diaphragm.
[0003]
As shown in FIG. 5, this conventional unidirectional dynamic microphone is composed of a
diaphragm 4 to which a microphone unit has a wedge-shaped magnetic circuit 2 and a voice coil
3, an equalizer 5, and a chamber 6.
[0004]
Of the microphone unit 1, the wedge-shaped magnetic circuit 2 is located in the center of the
bottom surface 7b of the frame yoke 7 having a concaved cross section and the flange 7a formed
on the outer peripheral portion, and the through hole 8a is formed in the central axis direction.
The upper side of the cylindrical shape has an N-pole (or S-pole) at the upper side and the
magnet 8 is magnetized at the lower side at the S-pole (or N-pole), and the upper side of the
magnet 8 and the upper side of the frame yoke 7 are fixed. The rigidity ring 9 is engaged with
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the circumference to support the upper side of the magnet 8 and a ring-shaped plate 10 having a
circular opening 10a larger in diameter than the outer diameter of the magnet 8 is inserted in
the opening of the frame yoke 7 It is configured to form a magnetic gap g with the magnet 8.
[0005]
A plurality of openings 11 are formed in the flange portion 7 a of the frame yoke 7, and a
plurality of openings 12 are also formed in the bottom surface 7 b, and the opening 12 a located
at the center of the openings 12 is a central through hole of the magnet 8. In communication
with 8a, the stiffness ring 9 is also formed with an opening 13 so that the hollow portion of the
frame yoke 7 can be ventilated.
[0006]
A diaphragm 4 to which a voice coil 3 is attached is disposed on the upper surface side of the
frame yoke 7 of the wedge-shaped magnetic circuit 2 configured as described above, that is, on
the front side.
In the diaphragm 4, the voice ring 3 is inserted into the magnetic gap g between the magnet 8
and the plate 10 at the front peripheral edge of the flange portion 7a of the frame yoke 7 with
the diaphragm ring 14 attached to the outer periphery thereof. It is joined in the state of
[0007]
The equalizer 5 is covered from the front surface side of the diaphragm 4 to the outer peripheral
surface side of the frame yoke 7. An opening 15 is formed in the front surface 5 a of the
equalizer 5 facing the diaphragm 4, and the peripheral surface 5 b is the frame yoke 7. It is
formed to extend rearward from the outer periphery of the flange 7a.
[0008]
Further, the air chamber 6 is formed in a box shape by an elastic material such as rubber, and
fitted and fixed to the rear portion of the frame yoke 7, and is communicated with the hollow
portion of the frame yoke 7 through the opening 12 of the bottom surface 7b. .
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Although not shown, a lead wire is connected to the voice coil 3, and the lead wire is connected
to an output terminal attached to the outside of the air chamber 6.
[0009]
And, on the opening side of the air chamber 6, that is, on the lower surface side of the bottom
surface portion 7b of the frame yoke 7, a damper resistance paper 16 as an acoustic resistor is
attached.
[0010]
In the microphone unit configured as described above, when the sound pressure due to the
sound from the front side is applied to the diaphragm 4 through the opening 15 of the equalizer
5, the diaphragm 4 vibrates, and the voice coil 3 becomes magnetic of the magnetic circuit 2 by
this vibration. It is reciprocated in the axial direction in the air gap g, a current proportional to
the sound pressure flows through the voice coil 3, and the current is output through the lead-out
line to convert voice and the like into an electric signal.
The vibration of the diaphragm 4 is caused by the sound pressure of the air on the rear surface
side of the diaphragm 4 from the through holes 8a of the frame yoke 7 and the magnet 8
through the opening 12 of the bottom portion 7b to give resistance to the passing air. It will be
performed by repeating inflow and outflow into the air chamber 6 through the paper 16.
[0011]
The microphone unit 1 has a structure in which sound pressure from the outside is also applied
to a part of the rear side of the diaphragm 4 to constitute a unidirectional microphone.
That is, sound pressure is applied to the vicinity of the outer periphery which is a part of the rear
surface side of the diaphragm 4 through the opening 11 formed in the flange portion 7 a of the
frame yoke 7.
[0012]
When the air permeability of the opening 11 of the flange portion 7a is good, the diaphragm 4 is
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easily vibrated, and the microphone becomes a velocity type so that it becomes bi-directional, so
the flange portion 7a passes through the opening 11 The directional resistance paper 17 which
consists of a non-woven paper etc. as an acoustic resistor which gives resistance to the air is
stuck, and a unidirectional microphone is comprised.
[0013]
Also, in the microphone unit 18 of the other conventional unidirectional dynamic microphone
shown in FIG. 6, a directional resistance foam 19 is used instead of the directional resistance
paper 17 in the microphone unit 1 shown in FIG. 5 described above. .
[0014]
That is, the directional resistance foam 19 is formed of a foamed resin material in a desired
thickness and in a ring shape having the same inner diameter as the outer diameter of the frame
yoke 7, and the directional resistance foam 19 is inserted into the outer periphery of the frame
yoke 7. And the outer peripheral surface side of the foam 19 is covered with the peripheral
surface 5b of the equalizer 5, thereby giving resistance to the air passing through the opening 11
to the diaphragm 4 A single directional microphone is configured to be able to apply sound
pressure.
[0015]
SUMMARY OF THE INVENTION In the microphone unit of the conventional unidirectional
dynamic microphone configured as described above, air passing through an opening for applying
an external sound pressure to the rear surface side of the diaphragm is detected. A directional
resistance paper made of non-woven paper or the like, and a directional resistance foam made of
a foamed resin material are used as the acoustic resistance material for giving resistance.
Unnecessary resistance causes the sound to be absorbed too much, making it difficult to achieve
a flexible sound quality.
[0016]
The present invention has been made in view of the foregoing, and it is an object of the present
invention to significantly improve sound quality in an acoustic-electric conversion device, in
particular, a unidirectional dynamic microphone.
[0017]
SUMMARY OF THE INVENTION In order to achieve the above object, an acoustoelectric
converter according to the present invention is an acoustic resistor that provides resistance to air
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passing by sound pressure through an opening disposed opposite to a diaphragm. Is formed by
pressing a wire mesh formed by weaving a metal wire of a required thickness.
[0018]
Further, in this configuration, an acoustic resistor provided in an opening for applying an
outward sound pressure to a required portion on the rear side of the diaphragm is formed by
pressing a metal mesh formed by weaving a metal wire.
[0019]
Furthermore, in the above-described configuration, the wire mesh formed by pressing is formed
by pressing the contact portions of at least the metal wires with each other and pressing them
with a required contact surface to form an acoustic resistor.
[0020]
In the acoustic-electric conversion device configured as described above, the sound quality is
improved without giving resistance more than necessary in the middle to high frequency and
with almost no vibration generated in the metal mesh itself.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to FIGS.
[0022]
In this embodiment, the acoustic-electric conversion device according to the present invention is
configured as a single directional dynamic microphone, and FIG. 1 shows a microphone unit.
[0023]
The microphone unit of this embodiment is configured substantially the same as the microphone
unit shown in FIG. 5 and FIG. 6 described above, so the corresponding members are given the
same reference symbols and redundant description will be omitted.
[0024]
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Reference numeral 20 in FIG. 1 indicates the entire microphone unit of this embodiment.
In this microphone unit 20, an acoustic resistor 21 for giving resistance to the passing air is
formed by a wire mesh.
[0025]
In a normal wire mesh, a metal wire is woven and formed, and when this wire mesh is used as the
acoustic resistor 21 as it is, when sound pressure is applied to the wire mesh, the metal wire
vibrates due to vibration of sound pressure. Although a phenomenon such as ringing occurs and
the sound quality is impaired, in this embodiment, a wire mesh is formed by pressing with a
required pressure.
[0026]
That is, in this embodiment, as shown in FIG. 3A, the wire mesh is woven using relatively thick
vertical and horizontal metal wires 22a and 22b constituting the wire mesh 22, and the wire
mesh is required from the upper and lower surface directions. By pressing with pressure, the
longitudinal and lateral metal wires 22a and 22b are brought into close contact with each other
while the contact area between the longitudinal and lateral metal wires 22a and 22b increases,
and the wire mesh 22 shown in FIG. 3B is formed.
In this wire mesh 22, the vibration of the longitudinal and lateral metal wires 22a and 22b is
significantly reduced, and the distance between the meshes is narrowed by the pressing of the
metal wires 22a and 22b, and passes as shown in FIG. An acoustic resistor 21 is formed which
can provide the required resistance to air.
[0027]
The wire mesh 22 thus formed is used as the acoustic resistor 21 of the microphone unit 20 in
this embodiment.
That is, in the microphone unit 20 according to this embodiment, as shown in FIG. 1, the wire
mesh 22 described above is used as an acoustic resistor instead of the damper resistance paper
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16 and the directional resistance paper 17 provided in the conventional microphone unit 1
described above. It is used as 21.
[0028]
In particular, in this embodiment, the directional resistor described above is provided as a
directional resistor that provides resistance to air passing through the opening 11 formed in the
flange portion 7a of the frame yoke 7 in order to apply sound pressure from behind to the
diaphragm 4 of the microphone unit 20. The required directional resistance is obtained by using
the acoustic resistor 21 formed of the metal mesh 22 and the conventional non-woven fabric
whose directional resistance at the mid frequency is indicated by the broken line a as shown in
FIG. It can be seen that it is reduced compared to the case of using a directional resistance paper
made of paper or the like, and the reduction in the directional resistance improves the sound
quality.
[0029]
In this experiment, only the directional resistance was examined, but the damper resistor 26
provides resistance to the air passing through the bottom surface 7b side opening 12 of the
frame yoke 7 by the sound pressure from the front side of the diaphragm 4 of the microphone
unit 20. By using the acoustic resistor 21 formed of the above-described wire mesh 22 as
described above, it is possible to reproduce a sound with better sound omission.
[0030]
Next, to describe the method of assembling the microphone of this embodiment, first, the method
of manufacturing the microphone unit 20 will be described.
[0031]
The voice coil 3 is bonded with an adhesive to the diaphragm 4 to which the diaphragm ring 14
is attached using a jig (not shown), and after drying of the adhesive, the diaphragm 4 is removed
together with the voice coil 3 from the jig.
[0032]
Next, the magnet 8 and the stiffness ring 9 are bonded with an adhesive and dried in the frame
yoke 7.
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A horizontal flange 7a is formed on the frame yoke 7, a plurality of openings 11 are formed in
the flange 7a, and a plurality of openings 12 are also formed on the bottom 7b.
The magnet 8 has a cylindrical shape having a through hole 8a in the central axis direction, and
is magnetized to the N pole (or S pole) on the upper side and the S pole (or N pole) on the lower
side. A vertical attachment surface portion 9a is formed with substantially the same diameter as
the inner peripheral diameter of the frame yoke 7, and the inner peripheral diameter is formed in
a ring shape with approximately the same diameter as the outer peripheral diameter of the
magnet 8. A plurality of openings are formed in the plane portion 9b. 13 is formed.
[0033]
The magnet 8 is communicated on the central portion of the bottom surface 7b of the frame yoke
7 formed in this manner, and the through hole 8a is communicated with the central opening 12a
of the opening 12 and adhered by an adhesive. In a state in which the stiffness ring 9 is fitted on
the inner peripheral side to the magnet 8 on the inner side, it is adhered by an adhesive and
dried at the mounting surface portion 9a.
Further, a ring-shaped plate 10 having a circular opening 10a larger than the outer diameter of
the magnet 8 is fitted and fixed on the inner periphery of the mouth of the frame yoke 7 to form
a magnetic gap g with the magnet 8. .
[0034]
On the other hand, the diaphragm 4 to which the voice coil 3 is adhered is adhered and fixed in
the equalizer 5.
The equalizer 5 is formed substantially in a lid shape by the front surface portion 5a and the
peripheral surface portion 5b, and a plurality of openings 15 are formed in the front surface
portion 5a. Inside the equalizer 5, the diaphragm 4 is interposed via the diaphragm ring 14 The
diaphragm ring 14 is fitted and fixed to the inside of the peripheral surface portion 5 b of the
equalizer 5 with an adhesive.
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After drying the adhesive, the equalizer 5 is fitted to the front side of the frame yoke 7 and the
voice coil 3 adhered to the diaphragm 4 is inserted into the aforementioned magnetic gap g on
the frame yoke 7 side. 5b is adhered and fixed to the peripheral surface of the flange portion 7a
of the frame yoke 7 by an adhesive.
[0035]
After the adhesive is dried, the lead (not shown) of the voice coil 3 is soldered to the output
terminal (not shown), and the lead is fixed with the adhesive.
After drying of the adhesive, the magnetic circuit is magnetized.
[0036]
Thereafter, the acoustic resistor 21 as a damper resistor formed by the wire mesh 22 described
above is adhered to the back surface side of the bottom surface 7b where the opening 12 of the
frame yoke 7 is formed by an adhesive.
As the damper resistor, a conventional damper resistance paper made of non-woven paper or the
like used may be used.
[0037]
Then, it is formed between the outer peripheral surface of the frame yoke 7 and the inner
peripheral surface of the peripheral surface 5 b of the equalizer 5 on the back surface side of the
flange 7 b of the frame yoke 7 and formed by the above-mentioned wire mesh 22 as a directional
resistor. The acoustic resistor 21 is bonded with an adhesive.
[0038]
Thus, after bonding the damper resistor and the directional resistor to the frame yoke 7 side, the
air chamber 6 formed in a box shape by an elastic material such as rubber is fitted to the back
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surface side of the frame yoke 7 and bonded It is fixed by the agent and is communicated
between the inside of the frame yoke 7 and the opening 12 of the bottom surface 7b.
A flange 6 a is formed on the outer peripheral surface side of the air chamber 6.
[0039]
The microphone unit 20 is completed by the above manufacturing process.
The microphone unit 20 is assembled by a head grill 31 and a grip 32 in which a wind screen
made of, for example, a foam is placed inside, and the microphone 30 is assembled.
In assembling the microphone 30, the flange 6 a of the air chamber 6 of the microphone unit 20
is sandwiched between the head grill 31 and the grip 32 so that the microphone unit 20 is built
in a stationary state.
Attach an on / off switch with a microphone wire normally used to the grip 32 with a screw or
the like, and solder fix the output terminal of the microphone unit 20 to the lead wire drawn
from the upper side of the grip 32 .
[0040]
As mentioned above, although embodiment of this invention was described, this invention is not
limited to this embodiment, It can change variously in the range which does not deviate from the
meaning of this invention.
[0041]
For example, the shape and the like of each member can be arbitrarily changed in accordance
with the shape and the like of the entire microphone.
Also, as a damper wire which is an acoustic resistor, and a metal wire of a wire mesh forming a
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directional resistor, a wire which can be press-worked with relatively high tensile strength such
as iron wire, stainless steel, aluminum wire etc. can be used It is a thing.
Further, as a material for forming the air chamber, not only rubber but also a synthetic resin
material having elasticity can be used.
[0042]
The present invention is not limited to microphones, and can be applied to various acousticelectric conversion devices.
[0043]
As described above, according to the acousto-electric conversion device of the present invention,
a metal wire is used to weave an acoustic resistor that provides resistance to air passing through
an opening formed opposite to a diaphragm by sound pressure. The wire mesh to be formed is
pressed and formed, so that the metal wire forming the wire mesh is pressed against each other
and the contact area is large and the pressure contact area is large without giving resistance
more than necessary in the middle and high frequency. Therefore, vibration is difficult to occur,
and therefore, the sound quality can be improved and the acoustic-electric conversion can be
performed well.
[0044]
Also, the acoustic resistor can be easily formed by pressing a wire mesh formed by weaving a
metal wire, and there is almost no increase in cost as compared with the conventional one, and
the cost of the entire device is increased. Is also advantageous.
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