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JP2003304591

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DESCRIPTION JP2003304591
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus having various electroacoustic transducers.
[0002]
2. Description of the Related Art A conventional loudspeaker apparatus will be described with
reference to a cross-sectional view of FIG.
[0003]
In the figure, reference numeral 101 denotes a piezoelectric ceramic formed in a substantially
spherical shape, and an internal electrode 102 is formed inside the piezoelectric ceramic 101,
and an external electrode 103 is formed outside the piezoelectric ceramic 101.
In this speaker device, when a voltage is applied through the lead wires 104 and 105
respectively connected to the inner electrode 102 and the outer electrode 103, the piezoelectric
ceramic 101 performs a breathing movement by the piezoelectric effect, and the sound waves
are radiated radially. The directivity has been reproduced uniformly in all directions.
[0004]
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1
However, in the above-mentioned speaker device, the piezoelectric ceramic itself is very hard due
to its material, and since it is structurally hard because its shape is substantially spherical, the
reproduction limit of the bass region is limited. It has a problem that it is difficult to set a certain
lowest resonance frequency to a low frequency.
[0005]
The present invention solves the above-mentioned problem, and can provide a speaker device
which can lower the lowest resonance frequency, widen the reproduction band, and has wide
directivity.
[0006]
[Means for Solving the Problems] In order to solve the above-mentioned problems, the speaker
device according to claim 1 of the present invention is a solid having a substantially spherical
shape and a solid having the substantially spherical shape with a space therebetween. And the at
least one electroacoustic transducer acoustically coupled to the space in the space, and the sound
from the substantially spherical diaphragm is provided. To realize a nondirectional speaker.
[0007]
The invention of the speaker according to claim 2 of the present invention realizes that a stable
sound space is created by arranging a spacer between the substantially spherical solid and the
diaphragm according to claim 1 It is a thing.
[0008]
The invention of the speaker according to claim 3 of the present invention is substantially
spherical by making the distance between the substantially spherical solid and the diaphragm
according to claim 1 larger toward the portion closer to the electroacoustic transducer. It makes
it possible to propagate sound more efficiently in the solid of the shape and the space of the
diaphragm.
[0009]
The invention of the speaker according to claim 4 of the present invention is characterized in
that the arrangement distance of the spacer disposed between the substantially spherical solid
and the diaphragm according to claim 1 is increased as it approaches the electroacoustic
transducer. This makes it possible to transmit sound more efficiently in the space of the
substantially spherical solid and the diaphragm.
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2
[0010]
According to a fifth aspect of the present invention, there is provided a speaker according to the
fifth aspect of the present invention, wherein the surface of the substantially spherical solid
according to the first aspect comprises at least one or more in a direction connecting the center
of the substantially spherical solid The provision of the grooves makes it possible to make the
acoustic radiation from the diaphragm more uniform.
[0011]
The invention of the speaker according to claim 6 of the present invention realizes that the sound
pressure frequency characteristic is further broadened by using a polymer film for the
substantially spherical diaphragm according to claim 1 It is.
[0012]
The invention of a loudspeaker according to claim 7 of the present invention makes it possible to
further reduce the lowest resonance frequency by using the polymer film according to claim 6 as
an elastomer.
[0013]
The invention of the speaker according to claim 8 of the present invention is that the
electroacoustic transducer according to claim 1 is connected to the space between the
substantially spherical solid and the diaphragm and housed in a cabinet, Interference of the
sound radiated from the back of the electroacoustic transducer is eliminated to enable stable
sound reproduction.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker device
according to the present invention will be described below with reference to FIGS.
[0015]
(First Embodiment) FIG. 1 is a cross-sectional view of a speaker apparatus according to an
embodiment of the present invention, and the first embodiment will be mainly described.
[0016]
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3
According to the figure, 1 is a solid having a substantially spherical shape, and a diaphragm 2
having a substantially spherical shape is disposed to cover the solid 1, and the diaphragm 2 is
connected to the electroacoustic transducer 3 through the space connecting member 4.
Combined with
The substantially spherical solid 1 is held by the support member 6.
The electro-acoustic transducer 3 is mounted on the baffle plate 5 so that the sound on the back
side does not interfere with the sound on the front side.
[0017]
Generally, an electrodynamic speaker is used as the electroacoustic transducer 3, but in principle,
other electroacoustic transducing such as an electromagnetic type is also possible.
[0018]
In the configuration as described above, when a signal is applied to the electroacoustic
transducer 3, the diaphragm of the electroacoustic transducer 3 vibrates.
This vibration vibrates the air in the space between the substantially spherical solid 1 and the
substantially spherical diaphragm 2 to vibrate the substantially spherical diaphragm 2 so that
sound waves are emitted from the diaphragm 2. become.
The sound wave is radiated in all directions because the shape of the diaphragm 2 is
substantially spherical.
Thus, an omnidirectional speaker can be realized.
[0019]
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4
As to the frequency characteristics of the reproduced sound pressure in this case, the lowest
resonance frequency which is the lower limit of the bass range is determined by the lowest
resonance frequency of the electroacoustic transducer 3 or the substantially spherical diaphragm
2 and the supporting method thereof. The lower one of the frequencies is determined.
The lowest resonance frequency of the electroacoustic transducer 3 can be freely selected
because there are various transducers from several tens of Hz to several kHz.
Therefore, the bass range limit is determined at the mechanical resonance frequency determined
by the substantially spherical diaphragm 2 and the supporting method thereof.
[0020]
Therefore, by making the plate thickness of the substantially spherical diaphragm 2 thin and
making it soft, it is possible to lower the mechanical resonance frequency which is the low
frequency range limit.
[0021]
(Embodiment 2) FIG. 2 is a cross-sectional view of another embodiment of the speaker device of
the present invention, and the second embodiment will be mainly described.
The same parts as in the first embodiment will be assigned the same reference numerals and
explanations thereof will be omitted.
[0022]
According to this figure, the difference from the first embodiment is that the substantially
spherical diaphragm 2 is supported by the spacer 7 on the substantially spherical solid 1.
As a result, the gap between the substantially spherical solid 1 and the substantially spherical
diaphragm 2 can be stably maintained.
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[0023]
Therefore, when the substantially spherical diaphragm 2 radiates a sound, generation of an
abnormal sound can be suppressed by coming into contact with the substantially spherical solid
1 by vibration.
Further, since the space which is the gap is also an element which determines the frequency
characteristic acoustically, it is possible to stabilize the acoustic characteristic by keeping the gap
stable.
[0024]
(Third Embodiment) FIG. 3 is a cross-sectional view of another embodiment of the speaker device
according to the present invention, and the third embodiment will be mainly described.
The same parts as in the first embodiment will be assigned the same reference numerals and
explanations thereof will be omitted.
[0025]
According to this figure, the difference from the first embodiment is that the gap between the
substantially spherical solid 1 and the substantially spherical diaphragm 2 is larger on the side
closer to the electroacoustic transducer 3.
[0026]
The sound radiated from the front surface of the electroacoustic transducer 3 is transmitted to
the space in the substantially spherical diaphragm by the connecting member 4.
[0027]
Therefore, by adopting the configuration as in the present embodiment, matching of acoustic
impedance can be further achieved at the coupling portion from connecting member 4 to the
space in the substantially spherical diaphragm, and as a result, the efficiency is high. Sound
conversion is possible.
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[0028]
(Fourth Embodiment) FIG. 4 is a cross-sectional view of another embodiment of the speaker
device according to the present invention, and the fourth embodiment will be mainly described.
The same parts as in the second embodiment will be assigned the same reference numerals and
explanations thereof will be omitted.
[0029]
According to this figure, the difference from the second embodiment is that the spacer 7 is
disposed closer to the electroacoustic transducer 3 with a gap.
[0030]
With this configuration, a wide range of spacer spacing can allow for more bass range
reproduction.
Originally, at very low frequencies, it is difficult to make the directivity wide and to make the
sound pressure high. Therefore, the above configuration makes it possible to achieve both the
reproduction of the bass region and the expansion of the directivity.
[0031]
(Fifth Embodiment) FIG. 5 is a cross-sectional view for explaining the shape of a substantially
spherical solid surface which is an essential part of another embodiment of the speaker device
according to the present invention, and FIG. The fifth aspect is mainly described.
The same parts as in the first embodiment will be assigned the same reference numerals and
explanations thereof will be omitted.
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[0032]
According to the figure, the difference from the first embodiment is that the groove 8 is at least
one in the direction connecting the center of the substantially spherical solid 1 and the
electroacoustic transducer 3 on the surface of the substantially spherical solid 1. The above is
provided.
[0033]
The space between the substantially spherical solid 1 and the substantially spherical diaphragm
2 is one parameter that determines the upper limit of the frequency characteristic of the sound
pressure.
By reducing the volume, the upper limit can be set to a high frequency.
In order to reduce the volume, it is necessary to reduce the gap between the substantially
spherical solid 1 and the substantially spherical diaphragm 2.
However, if this gap is made smaller, it becomes difficult to transmit the acoustic vibration
emitted from the electroacoustic transducer 3 to the whole of the substantially spherical
diaphragm 2 due to the viscous resistance of air.
[0034]
In the present embodiment, by providing at least one or more grooves in a direction connecting
the center of the substantially spherical solid 1 and the electroacoustic transducer 3, the
electroacoustic transducer 3 can be formed without increasing the volume of the gap. It becomes
possible to transmit the acoustic vibration emitted from the front to the substantially front of the
substantially spherical diaphragm 2 and to make it possible to simultaneously achieve the high
directivity of the omnidirectionality and the sound pressure frequency characteristic. is there.
[0035]
(Sixth Embodiment) Another embodiment of the speaker device according to the present
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8
invention uses a polymer film as the material of the substantially spherical diaphragm 2 in FIG. 6
will be described.
Although it has been described in the first embodiment that the critical frequency characteristics
of the low frequency range are determined by the substantially spherical diaphragm 2 and the
supporting method thereof, the polymer film is generally a thin, light and soft material. By using
it for the material of the substantially spherical diaphragm 2, it is possible to lower the threshold
frequency of the low frequency range.
[0036]
(Seventh Embodiment) In another embodiment of the speaker device according to the present
invention, the polymer film of the substantially spherical diaphragm 2 according to the sixth
embodiment is an elastomer, and the seventh embodiment will be mainly described. It is a thing.
[0037]
Elastomers are generally soft and stretchable materials, so that it is possible to easily lower the
limit frequency of the low range.
[0038]
(Embodiment 8) Another embodiment of the loudspeaker apparatus of the present invention will
be described with reference to the sectional view of FIG.
The present embodiment mainly describes claim 8, and the same parts as in the first embodiment
will be assigned the same reference numerals and explanations thereof will be omitted.
[0039]
According to this figure, the difference from the first embodiment is that an enclosure 9 is
provided on the back side of the electroacoustic transducer 3.
[0040]
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9
With this configuration, it is possible to realize interference with the radiation sound emitted
from the substantially spherical diaphragm 2 with a more compact size by the radiation sound
from the back surface of the electroacoustic transducer 3.
Note that various types of enclosures, such as a closed type and a phase inverted type, which are
generally used for a speaker device, can be adopted as this enclosure.
[0041]
As described above, according to the speaker device of the present invention, the substantially
spherical diaphragm and the substantially spherical diaphragm disposed so as to cover the solid
with a gap between the substantially spherical solid and the substantially spherical solid are
more preferable. By electrically coupling the electro-acoustic transducer with the internal space,
the acoustically coupled space and the substantially spherical diaphragm are acoustically driven,
and from the substantially spherical diaphragm Since the sound waves are emitted, broad
directivity reproduction is realized.
[0042]
Brief description of the drawings
[0043]
1 is a cross-sectional view of an embodiment of the speaker device of the present invention
[0044]
2 is a cross-sectional view of the other embodiment
[0045]
3 is a sectional view of the other embodiment
[0046]
4 is a cross-sectional view of the other embodiment
[0047]
5 is a cross-sectional view for explaining the shape of the solid surface which is an essential part
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10
of the other embodiment
[0048]
Fig. 6 Cross section in the same horizontal direction
[0049]
7 is a cross-sectional view of another embodiment of the speaker device of the present invention
[0050]
Fig. 8 Cross-sectional view of the conventional speaker device
[0051]
Explanation of sign
[0052]
Reference Signs List 1 solid spherical 2 diaphragm 3 electroacoustic transducer 4 connecting
member 5 baffle plate 6 supporting member 7 spacer 8 groove 9 enclosure
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