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JP2015220665

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DESCRIPTION JP2015220665
An electrodynamic electroacoustic transducer is provided that accurately and easily mounts a
diaphragm assembly including a diaphragm and a voice coil to a unit housing. A peripheral edge
portion of a diaphragm (6) is curved upward while forming a lower convex portion (6a)
downward toward an end portion side thereof, and an opening edge portion of a unit housing (9)
is a lower convex of the diaphragm. A support base 9b is formed in contact with the lower part,
and a recess 9a is formed on the inner side so that the peripheral edge 6b of the diaphragm can
be engaged. The portion is supported by the support base portion of the unit housing, so that the
peripheral end is engaged with the recess of the unit housing with an upward elastic force.
[Selected figure] Figure 1
Electrokinetic electroacoustic transducer, diaphragm thereof, and method of manufacturing
electrokinetic electroacoustic transducer
[0001]
The present invention relates to an electrodynamic electroacoustic transducer, a diaphragm
thereof, and a method of manufacturing the electrodynamic electroacoustic transducer, for
example, an electrodynamic electroacoustic transducer applied to a dynamic headphone or a
dynamic microphone, and The present invention relates to a diaphragm and a method of
manufacturing an electrodynamic electroacoustic transducer.
[0002]
Dynamic headphones and dynamic microphones are electrodynamic electroacoustic transducers
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that convert electric signals into sound waves or convert sound waves into electric signals using
the law of electromagnetic induction.
FIG. 3 shows a cross-sectional view of the dynamic microphone unit. As illustrated, the
microphone unit 50 includes a magnetic circuit in which the disk-shaped pole piece 51 and the
magnet 52 which are stacked are surrounded by the yoke 53. Further, a gap is formed between
the pole piece 51 and the yoke 53. The cylindrical voice coil 55 attached to the diaphragm 54 is
disposed in the gap so as to be capable of moving up and down.
[0003]
The yoke 53 is held at the top of a cylindrical unit housing 57. At the lower part of the unit
housing 57, a unit frame 58 having an air chamber inside is held. Further, the diaphragm 54 is
covered by a unit cap (resonator) 59 having a plurality of front acoustic terminals 59a. In the
microphone unit 50 configured as described above, when the diaphragm 54 vibrates due to the
sound wave, the voice coil 55 vibrates up and down simultaneously. As a result, an electromotive
force is generated in the coil, and the microphone unit 50 outputs an audio signal based on a
sound wave. The configuration of such a dynamic microphone is disclosed, for example, in Patent
Document 1.
[0004]
JP, 2013-141189, A
[0005]
FIG. 4 is a cross-sectional view of a state before the diaphragm 54, the voice coil 55, and the
resonator 59 are attached to the unit housing 57. As shown in FIG.
In general, the diaphragm 54 is manufactured by pressure heating and molding a plastic film.
Then, the voice coil 55 is attached to the diaphragm 54 (referred to as a diaphragm assembly
56), and the diaphragm assembly 56 is attached to the unit housing 57.
[0006]
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When the diaphragm assembly 56 is attached to the unit housing 57, the outer diameter of the
diaphragm 54 needs to be smaller than the inner diameter of the housing 57. Therefore, a
predetermined gap (about 0.1 to 0.4 mm) is provided between the outer diameter of the
diaphragm 54 and the inner diameter portion of the unit housing 57. Also, in this mounting
operation, the edge of the diaphragm is adhered to the peripheral edge of the unit housing 57
using an adhesive. Therefore, it is necessary to hold down the edge of the vibrating portion from
above using a weight until the adhesive solidifies.
[0007]
However, when the diaphragm is pressed by the weight, there is a problem that distortion occurs
in the diaphragm. Furthermore, this distortion is a cause of the eccentricity between the center of
the diaphragm 54 and the center of the unit housing 57, and the voice coil 55 comes into contact
with the magnetic circuit side, which hinders accurate attachment of the diaphragm assembly 56.
there were. Further, in the diaphragm pressed by the weight, the weight does not contact
uniformly with the peripheral portion of the diaphragm. Therefore, the diaphragm 54 and the
unit housing 57 are fixed in a state where the diaphragm 54 is stressed. In the microphone, this
stress reduces the low frequency response. In the case of headphones, this stress was the cause
of the generation of chattering noise.
[0008]
The present invention has been made focusing on the above-described points, and in the
electrodynamic electroacoustic transducer, the electrodynamics, in which the diaphragm
assembly including the diaphragm and the voice coil can be accurately attached to the unit
housing with ease. It is an object of the present invention to provide a method of manufacturing
an electroacoustic transducer, a diaphragm thereof, and an electrodynamic electroacoustic
transducer.
[0009]
In order to solve the above-mentioned problems, an electrodynamic electroacoustic transducer
according to the present invention comprises a unit housing for accommodating a magnetic
circuit, and a diaphragm attached to the opening edge of one end of the unit housing, An
electrodynamic electroacoustic transducer in which a voice coil is provided on the lower surface
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side of a diaphragm, and the peripheral edge portion of the diaphragm is curved upward while
forming a lower convex portion toward the end side thereof. And a support base portion which
abuts on the lower convex portion of the diaphragm is formed at the opening edge of the unit
housing, and a concave portion to which the peripheral end of the diaphragm can be engaged is
formed on the inner side surface. The diaphragm is supported by the support base portion of the
unit housing at its peripheral edge by the lower convex portion, so that the peripheral edge
portion is in the recess of the unit housing in a state of having an upward elastic force. Engage
Characterized in that there.
The recess formed in the opening edge of the unit housing is an annular recess formed along the
circumferential direction of the unit housing, and the engaging portion formed in the peripheral
portion of the diaphragm is: Preferably, it is the peripheral end of the diaphragm.
[0010]
According to such a configuration, the diaphragm is firmly fixed to the unit housing in order to
engage the peripheral end with the recess of the unit housing with the peripheral edge of the
diaphragm having an upward elastic force. Can. In addition, since the diaphragm is not distorted
and deformed, the center of the diaphragm and the center of the unit housing can be
automatically aligned, and the diaphragm can be attached in a state where the stiffness is stable.
In addition, since there is no stress due to the deformation of the diaphragm, the low frequency
response of the microphone does not decrease. In addition, when the present configuration is
applied to headphones, it is possible to prevent the generation of noise caused by stress.
Furthermore, unlike the prior art, there is no need for a gap for disposing the weight between the
diaphragm and the peripheral portion of the unit housing. Therefore, the effect that the effective
area of the diaphragm can be made larger than that of the conventional configuration can also be
obtained.
[0011]
Further, in a state in which an engaging portion formed on the peripheral edge of the diaphragm
is engaged with a recess formed on the opening edge of the unit housing, the peripheral edge of
the diaphragm is formed of the unit housing It may be fixed to the opening edge by an adhesive.
For example, in the case where the electrodynamic electroacoustic transducer of the present
invention is applied to a dynamic headphone, the diameter of the diaphragm is increased, and
hence the amplitude is also increased. Therefore, in addition to the engagement between the
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diaphragm and the unit housing, it is preferable to fix the diaphragm to the unit housing using an
adhesive as described above. Also in this case, since the diaphragm is fixed by engagement with
the unit housing, it is not necessary to fix the diaphragm with a weight as in the prior art until
the adhesive is solidified.
[0012]
Further, in order to solve the above-mentioned problems, a diaphragm according to the present
invention is the diaphragm used for the electrodynamic electroacoustic transducer, and is
characterized in that it is attached to the unit housing.
[0013]
Further, in order to solve the problems described above, a method of manufacturing an
electrodynamic electroacoustic transducer according to the present invention includes a unit
housing for accommodating a magnetic circuit, and a diaphragm attached to an opening edge of
one end of the unit housing. And the voice coil is provided on the lower surface side of the
diaphragm, wherein the peripheral portion of the diaphragm is projected downward toward the
end portion thereof. Forming an indentation on at least a part of the opening edge of the unit
housing, and engaging a portion engageable with the indentation on the peripheral edge of the
diaphragm. The method is characterized in that the method includes the step of forming and the
step of engaging the engaging portion formed on the peripheral edge of the diaphragm with the
recess formed on the opening edge of the unit housing.
According to such a method, the diaphragm is firmly fixed to the unit housing in order to engage
the peripheral end with the recess of the unit housing in a state where the peripheral edge of the
diaphragm is given an upward elastic force. it can. Further, since the diaphragm is not distorted
and deformed by this, the center of the diaphragm and the center of the unit housing can be
automatically aligned, and the diaphragm can be attached in a state where the stiffness is stable.
In addition, since there is no stress due to the deformation of the diaphragm, the low frequency
response of the microphone does not decrease. In addition, when the present configuration is
applied to headphones, since there is no stress due to deformation of the diaphragm, generation
of a rattling noise can be prevented. Furthermore, unlike the prior art, since a gap for arranging
the weight between the diaphragm and the peripheral portion of the unit housing is not required,
the effect that the effective area of the diaphragm can be larger than that of the conventional
configuration can be obtained. it can.
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[0014]
In an electrodynamic electroacoustic transducer, an electrodynamic electroacoustic transducer
that facilitates accurate attachment to a unit housing of a diaphragm assembly comprising a
diaphragm and a voice coil, and the diaphragm thereof, and electrodynamic electroacoustic
transducer A method of manufacturing the transducer can be obtained.
[0015]
FIG. 1 is a cross-sectional view of a dynamic microphone unit to which the electrodynamic
electroacoustic transducer according to the present invention is applied.
FIG. 2 is a cross-sectional view for explaining a process of attaching a diaphragm to a unit
housing in the dynamic microphone unit of FIG. FIG. 3 is a cross-sectional view of a conventional
dynamic microphone unit. FIG. 4 is a cross-sectional view for explaining a process of attaching a
diaphragm to a unit housing in the dynamic microphone unit of FIG.
[0016]
Hereinafter, embodiments of the present invention will be described based on the drawings. In
the following embodiments, a dynamic microphone unit will be described as an example of the
electrodynamic electroacoustic transducer of the present invention. FIG. 1 is a cross-sectional
view of a dynamic microphone unit to which the electrodynamic electroacoustic transducer
according to the present invention is applied. The dynamic microphone unit 1 of FIG. 1 includes a
magnetic circuit. This magnetic circuit is configured by stacking the disk-shaped pole piece 2 and
the magnet 3 and the bottom and the side of these are surrounded by the yoke 4. A
predetermined gap 5 is formed between the pole piece 2 and the yoke 4. Further, a plurality of
sound holes 4 a are formed on the bottom surface of the yoke 4.
[0017]
Further, on the pole piece 2, a diaphragm 6 made of, for example, a plastic film is disposed. A
cylindrical voice coil 7 is attached to the lower surface of the diaphragm 6. The diaphragm
assembly 8 is constituted by the diaphragm 6 and the voice coil 7. Further, the voice coil 7 is
disposed so as to be able to vibrate up and down in the gap 5.
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[0018]
The diaphragm 6 is attached to an opening edge on one end side of the cylindrical unit housing
9. Specifically, as shown in the exploded view of FIG. 2, the peripheral edge portion of the
diaphragm 6 has a shape curved upward while forming the lower convex portion 6 a downward
toward the end side thereof. ing. On the other hand, at the opening edge portion on one end side
of the unit housing 9, a support base portion 9b extended in a convex shape (rib shape) upward
along the opening is formed. Further, an annular recess 9a is formed on the inner surface of the
opening edge outside the support 9b. The annular recess 9 a is engageable with the peripheral
end 6 b of the diaphragm 6.
[0019]
Thus, the lower convex portion 6 a of the diaphragm 6 is supported by the support base 9 b of
the unit housing 9, and the peripheral end 6 b (engagement portion) of the diaphragm 6 is the
upper peripheral portion of the unit housing 9. 9a is engaged. Moreover, thereby, the said
peripheral edge part 6b is engaged with the said recessed part 9a in the state which had elastic
power upwards with the said lower convex part 6a as a fulcrum. Therefore, the diaphragm 6 is
firmly fixed to the opening edge of the unit housing 9.
[0020]
A magnetic circuit composed of the yoke 4 and the like is held at the upper portion of the unit
housing 9. The diaphragm 6 is attached to the unit housing 9 so as to cover the magnetic circuit.
In the lower part of the unit housing 9, a unit frame 10 having an internal space is inserted.
Sound holes 10a and 10b are bored on the upper and lower surfaces of the unit frame 10 to
function as rear acoustic terminals. The inner space of the unit frame 10 may be an air chamber,
but may be filled with a damper material to make it possible to change the acoustic resistance. A
disk-shaped unit cap (resonator) 11 is provided to cover the diaphragm 6 attached to the unit
housing 9. The unit cap 11 is provided with a front acoustic terminal 11 a composed of a
plurality of sound holes.
[0021]
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Subsequently, in the dynamic microphone unit 1 configured as described above, a process of
attaching the diaphragm 6 to the unit housing 9 will be described. First, as shown in FIG. 2, the
diaphragm 6 is shaped and cut so that its peripheral portion curves upward while forming the
lower convex portion 6a downward toward the end (peripheral end 6b) . On the other hand, in
the unit housing 9, a support base 9 b is formed inside the opening edge at one end, and a
reverse ridge-like recess 9 a is formed on the outside inner side surface. The cut size of the
diaphragm 6 is determined so that the peripheral end 6 b of the diaphragm 6 abuts on the recess
9 a of the unit housing 9.
[0022]
Next, the lower convex portion 6a provided on the peripheral edge of the diaphragm 6 is brought
into contact with the support base 9b provided on the opening edge of the unit housing 9, and as
shown in FIG. 20 is used to hold the peripheral portion of the diaphragm 6 down. Further, the
peripheral end 6 b is inserted into and engaged with the recess 9 a of the unit housing 9.
[0023]
According to such a mounting structure, the diaphragm 6 is engaged with the unit housing 9 in
order to engage the peripheral end 6 b with the recess 9 a of the unit housing 9 in a state where
the peripheral edge of the diaphragm 6 has an upward elastic force. It can be fixed firmly.
Moreover, since the diaphragm 6 is not distorted and deformed by this, the center of the
diaphragm 6 and the center of the unit housing 9 can be automatically aligned. Furthermore,
since the diaphragm 6 and the unit housing 9 do not have eccentricity, the diaphragm 6 can be
attached in a state in which the stiffness is stable. In addition, since there is no stress due to the
deformation of the diaphragm 6, the lowering of the low frequency response of the microphone
does not occur. Further, also in the case where the present configuration is applied to
headphones, similarly, since there is no stress due to the deformation of the diaphragm 6,
generation of a rattling noise can be prevented. Furthermore, since the gap for arranging the
weight between the diaphragm 6 and the peripheral portion of the unit housing 9 is not required
as in the prior art, the effective area of the diaphragm 6 can be larger than the conventional
configuration. You can get it.
[0024]
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In the embodiment, the diaphragm 6 is attached only by the engagement between the diaphragm
6 and the unit housing 9 without using an adhesive. However, the electrodynamic electroacoustic
transducer according to the present invention is not limited to that form. For example, in the case
where the electrodynamic electroacoustic transducer of the present invention is applied to a
dynamic headphone, the diameter of the diaphragm is increased, and hence the amplitude is also
increased. Therefore, in addition to the engagement between the diaphragm and the unit
housing, it is preferable to use an adhesive to fix the diaphragm to the unit housing. Also in this
case, since the diaphragm is fixed by engagement with the unit housing, it is not necessary to fix
the diaphragm with a weight as in the prior art until the adhesive is solidified.
[0025]
In the embodiment, the recess 9a provided at the opening edge of the unit housing 9 is an
annular recess formed in the circumferential direction along the inner peripheral surface, but this
recess is formed, for example, in the circumferential direction. A plurality may be provided at
equal intervals along the line. Further, in this case, in accordance with the arrangement of the
concave portion of the unit housing 9, a convex portion that can be engaged with the peripheral
end of the diaphragm 6 may be formed.
[0026]
Further, in the above embodiment, the elasticity of the peripheral portion of the diaphragm 6
changes due to the height difference between the position of the recess 9a at the opening edge of
the unit housing 9 and the position of the support base 9b. Along with this, the stiffness of the
diaphragm 6 also changes. Therefore, the low frequency response can be made variable by the
difference in height between the recess 9a of the unit housing 9 and the support 9b.
[0027]
Moreover, in the said embodiment, although the dynamic microphone unit was demonstrated to
the example as an electrodynamic electroacoustic transducer based on this invention, it can
apply not only to it but a dynamic headphone.
[0028]
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Moreover, in the said embodiment, although the unit housing 9 was made into cylindrical shape,
it is not limited to the shape.
That is, any housing may be used as long as it has an opening to which the diaphragm can be
attached and can accommodate the magnetic circuit. For example, the housing may have a disk
shape as employed in headphones.
[0029]
Reference Signs List 1 dynamic microphone (electrodynamic electro-acoustic transducer) 2 pole
piece 3 magnet 4 yoke 5 gap 6 diaphragm 6a lower convex portion 6b peripheral edge 7 voice
coil 8 diaphragm assembly 9 unit housing 9a recess 9b support base 10 unit Frame 11 unit cap
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