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DESCRIPTION JP2015033110

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DESCRIPTION JP2015033110
PROBLEM TO BE SOLVED: In an earphone in which a resonance sound is generated due to a
closed tube resonance generated in an ear canal by wearing, an resonance sound giving
discomfort can be silenced with a simple configuration, and an earphone with easy adjustment of
the silence amount. To provide. SOLUTION: A resonator 37 is provided in a part of a case lid 34
on the front side of a diaphragm 33 provided in the electroacoustic transducer 32 in the
earphone 30 in which a closed tube resonance occurs in the external ear canal by being attached
to the ear. The small space 38 provided in the case lid 34 and the air hole 40 connecting the
space 38 with the space 39 between the diaphragm 33 and the inner surface of the case lid 34
are formed. Yes. [Selected figure] Figure 1
イヤホン
[0001]
The present invention relates to an earphone that generates resonance sound due to closed tube
resonance generated in the ear canal when worn on the ear, so-called canal type earphone.
[0002]
FIG. 7 is a cross-sectional view of a so-called canal-type earphone 10 shown as the first
conventional example, and FIG. 8 is a front view of the same earphone 10.
As shown in the figure, in the earphone 10, an electroacoustic transducer (driver unit) 11 is
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disposed in the case main body 12, and a case lid 13 is covered and fixed to the case main body
12. In the case lid 13, the sound guiding tube 14 is integrally formed on one side, and the cord
holding portion 15 is integrally formed on the other side. The cord 16 held by the cord holder 15
is connected to the electro-acoustic transducer 11, and the cord 16 sends an audio current.
[0003]
The above-described earphone 10 is attached to the ear such that the attachment pad 17
provided on the sound introduction tube 14 is fitted to the entrance of the ear canal, and the
sound due to the vibration of the diaphragm 18 included in the electroacoustic transducer 11 is
detected. Listen. Therefore, in the case of such an earphone 10, in the state of being worn on the
human ear, the entrance of the ear canal is closed by the earphone 10 and the back of the ear
canal is closed by the tympanic membrane, thereby causing closed tube resonance in the ear
canal. , The resonance mode changes.
[0004]
FIG. 9 shows the frequency characteristic A1 of the earphone 10. As shown in the figure, a sound
pressure level portion A1Q in which the sound pressure level changes rapidly is generated in
frequency bands around 5 kHz including that. As a result, the above-described sound pressure
level portion A1Q causes the generation of resonance noise which is an unpleasant feeling.
[0005]
Therefore, various earphones have been developed in order to mute the above-mentioned
resonance sound, and an example thereof is shown as a second conventional example. FIG. 10
shows a canal type earphone 20 shown as the second prior art. The earphone 20 is configured to
input a sound wave generated from the diaphragm 22 of the electroacoustic transducer 21 to the
ear canal through the first sound introducing pipe 23a and the second sound introducing pipe
23b.
[0006]
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That is, by providing a phase difference of 180 degrees between the frequency of the sound
wave passing through the first sound conduction tube 23a and the frequency of the sound wave
passing through the second sound conduction tube 23b, the sound is sent from these sound
conduction tubes 23a and 23b. When the sound wave enters the ear canal, it is canceled out and
the resonance sound is silenced. In addition, in FIG. 10, 24 denotes a case, and 25 denotes a pad
for mounting.
[0007]
Patent No. 4681698 gazette
[0008]
The earphone 20 of the second conventional example described above is effective in silencing
the resonance sound, but only by providing the two sound guiding pipes 23a and 23b, the crosssectional diameter of the sound guiding pipe becomes small, and the sound quality is
deteriorated. Do.
Further, since the frequency of the earphone 20 can be determined by the length setting of the
sound guide tubes 23a and 23b, adjustment of muffling is difficult.
[0009]
Therefore, in the present invention, it is an object of the present invention to provide an
earphone capable of muffling a resonance sound giving an unpleasant feeling with a simple
configuration in consideration of the above-mentioned actual situation, and of facilitating
adjustment of the muffling amount.
[0010]
In order to achieve the above object, according to the present invention, in the earphone in which
resonance sound is generated due to closed tube resonance generated in the ear canal by being
attached to the ear according to the present invention, We propose an earphone characterized in
that a resonator is provided in a part of a housing case.
[0011]
As a second invention, in the earphone according to the first invention described above, the
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resonator includes a small space provided in the housing case, and a space between the
diaphragm and the inner surface of the housing case. The present invention proposes an
earphone characterized in that it comprises a vent hole communicated with the
[0012]
As a third invention, in the earphone according to the second invention described above, there is
proposed an earphone characterized in that a sound absorbing material such as urethane foam is
provided in the vacant room.
[0013]
As a fourth invention, an earphone according to any one of the first to third inventions described
above is provided with a plurality of resonators.
[0014]
According to the first aspect of the invention, since the resonator is provided in a part of the
housing case on the front side of the diaphragm provided in the electroacoustic transducer,
resonance noise generated by closed tube resonance generated in the ear canal is effectively
achieved by this resonator. Thus, it is possible to provide an earphone in which the cost increase
due to the addition of the noise reduction structure is suppressed.
[0015]
That is, as in the second aspect of the invention, the resonator can be easily formed by a small
space provided in the housing case and a vent hole communicating the space and the inside of
the housing case.
That is, by appropriately setting the volume of the small space, the length and diameter of the
vent hole, etc., the sound wave having closed tube resonance in the ear canal circulates
vigorously at the vent hole, and at this time the sound wave is generated by the friction at the
vent hole portion. A part of the energy of is converted to heat energy and muffles.
[0016]
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According to a third aspect of the present invention, a sound absorbing material such as foam
urethane is installed in an empty room forming a resonator.
That is, the muffling amount can be adjusted according to the interior amount of the sound
absorbing material.
[0017]
A fourth invention is characterized by an earphone provided with a plurality of resonators.
Although one resonator may be used, for example, by providing two resonators, the muffling
efficiency can be enhanced.
[0018]
It is sectional drawing of the earphone shown as 1st Embodiment.
It is a front view of the earphone shown as a 1st embodiment.
It is a frequency characteristic view of the earphone shown as a 1st embodiment.
It is sectional drawing of the earphone shown as 2nd Embodiment. It is a frequency characteristic
view of the earphone shown as a 2nd embodiment. It is a front view of the earphone shown as a
3rd embodiment. It is sectional drawing of the earphone shown as a 1st prior art example. It is a
front view of the earphone shown as a 1st prior art example. It is a frequency characteristic
figure of the earphone shown as a 1st prior art example. It is a sectional view of the earphone
shown as a 2nd prior art example.
[0019]
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Next, a first embodiment of the earphone according to the present invention will be described
with reference to the drawings. In the earphone 30 of this embodiment, as shown in the sectional
view of FIG. 1 and the front view of FIG. 2, the electroacoustic transducer (driver unit) 32 is
disposed in a dish-like case main body 31 formed of a synthetic resin material. It is set up. The
electroacoustic transducer 32 is of a known configuration provided with a diaphragm 33.
[0020]
Further, a case lid 34 formed of a synthetic resin material is covered on the case main body 31
described above. That is, a housing case is formed by the case main body 31 and the case lid 34,
and the electro-acoustic transducer 32 is provided inside the case. In addition, the case cover 34
has the sound guide tube 35 integrally formed on one side thereof and the cord holding portion
36 integrally formed on the other side, and in particular, the case cover 34 has a Helmholtz
resonator. 37 are provided.
[0021]
That is, on the outer surface of the case lid 34, a cavity 38 formed by a recessed groove 37a
surrounded by a circular wall and a cover 37b closing the recessed groove 37a, and a case on the
front side of the cavity 38 and the diaphragm 33 A resonator 37 formed by a vent (port) 40
communicating with the inner space 39 is provided.
[0022]
Further, a mounting pad 41 is fitted in the sound emitting portion of the sound guiding tube 35
provided on the case lid 34.
That is, it is configured as a so-called canal type earphone in which the pad 41 is inserted in close
contact with the entrance of the ear canal of the human ear and the earphone is mounted. The
pad 41 is formed of an elastic material, and is fitted exchangeably to the sound guide tube 35. In
addition, the cord 42 held in the cord holder 36 is electrically connected to the electro-acoustic
transducer 32 by a cord for sending an audio current to the electro-acoustic transducer 32.
[0023]
Although the above-described earphone 30 is worn on the human ear and listens to the sound
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due to the vibration of the diaphragm 33, closed tube resonance occurs in the ear canal because
the pad 41 is inserted and fitted at the entrance of the ear canal. The acoustic frequency of the
closed tube resonance is improved by the resonator 37, and the resonance sound based on the
closed tube resonance is silenced.
[0024]
That is, by appropriately designing the volume of the cavity 38 of the resonator 37, the length
and the diameter of the vent hole 40, and the like, resonance noise due to the closed tube
resonance frequency (frequency bands before and after 5 kHz including that) can be silenced.
Specifically, a sound wave having a closed tube resonance in the ear canal distributes violently at
the vent 40, and at this time, a part of the energy of the sound wave is converted into a thermal
energy by the friction at the portion of the vent 40 and a muffling action is performed.
[0025]
FIG. 3 shows a frequency characteristic diagram of the earphone 30 of the first embodiment
described above. In this characteristic diagram, the characteristic A2 of the solid line is the
frequency characteristic measured for the earphone 30 of the present embodiment, and the
characteristic A1 of the dotted line is the frequency characteristic measured for the conventional
earphone without the resonator. It is. As shown in the drawing, if the resonator 37 is not
provided, the sound pressure level portion A1Q which changes rapidly appears, but in the case of
the present embodiment provided with the resonator 37, the sound pressure level portion A2Q
(frequency around it including 5 kHz Improved like a band).
[0026]
FIG. 4 shows the earphone 50 according to the second embodiment. In the present embodiment,
a sound absorbing material 51 such as foam polystyrene is internally provided in a space 38
forming the resonator 37 so that the muffling amount of the resonator 37 can be adjusted. And
others have the same configuration as the earphone 20 of the first embodiment described above.
[0027]
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The sound absorbing material 51 removes the cover 37b and after the sound absorbing material
51 is installed in the recessed groove 37a, the cover 37b is fixed to the opening edge of the
recessed groove 37a with an adhesive or the like.
FIG. 5 shows a frequency characteristic A3 measured for the earphone 50 of the second
embodiment, which is improved as a sound pressure level portion A3Q.
[0028]
FIG. 6 shows the earphone 60 of the third embodiment, and in the present embodiment, the case
lid 34 is provided with two resonators 61a and 62b having the same configuration as the
resonator 37 described above. The configuration is the same as that of the first or second
embodiment. The present embodiment can further improve the adverse effect on the closed tube
resonance frequency.
[0029]
The present invention is applied to a so-called canal-type earphone, which generates resonance
sound due to closed tube resonance generated in the ear canal by being attached to the ear.
[0030]
Reference Signs List 30 earphone 31 case main body 32 electroacoustic transducer 33
diaphragm 34 case lid 35 sound conducting tube 37 resonator 38 cavity 40 air vent 50
earphone 51 sound absorbing material 60 earphone 61a, 62b resonator
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