JP2002291099

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DESCRIPTION JP2002291099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system used for audio equipment and the like.
[0002]
2. Description of the Related Art A speaker outputs sound by changing the pressure (sound
pressure) of ambient air by oscillating a diaphragm.
[0003]
When sound pressure is insufficient with one speaker, desired sound pressure can be obtained
by synthesizing output sounds of a plurality of speakers.
[0004]
FIG. 12 shows a top view of a conventional loudspeaker system 1200 in which four loudspeakers
are arranged.
In the speaker system 1200, the first speaker 1201, the second speaker 1202, the third speaker
1203, and the fourth speaker 1204 are disposed on the baffle plate 1210 which is a flat surface.
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[0005]
FIG. 13 is a correlation graph between the number of speakers and the increase in sound
pressure.
The sound pressure increase represents the difference between the synthetic sound pressure
output from an arbitrary number of speakers and the output sound pressure of the speaker alone
in dB. The graph shown in FIG. 13 is given by the following theoretical formula. Here, L is
assumed to be 70 dB.
[0006]
Table 1 shows specific numerical values given by theoretical formulas.
[0007]
As shown in FIG. 13 and Table 1, the sound pressure increases as the number of speakers
increases.
[0008]
However, when attempting to place the conventional speaker system 1200 having a plurality of
loudspeakers on a plane in this way in a space having a limited surface area, such as a car room,
a wall of a room or a tabletop, The number of speakers that can be set is limited, and as a result,
the sound pressure can not be increased.
[0009]
The present invention has been made in view of the above problems, and it is possible to
maintain the same surface area as in the case of using a single speaker while increasing the
sound pressure using a plurality of speakers It aims at providing a speaker system.
[0010]
A speaker system according to the present invention comprises a first speaker, a second speaker,
and the first speaker such that the first speaker and the second speaker face each other. A
speaker system comprising: a first spacer separating the second speaker, wherein the facing
surfaces of the first speaker and the second speaker output sounds of the same phase. Speaker
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and the second speaker are disposed, and the first speaker, the second speaker, and the first
spacer output from the facing surfaces of the first speaker and the second speaker A first sound
path may be formed through which the sound to be played passes.
[0011]
The first sound path may be formed such that the transmission direction of sound passing
through the first sound path is perpendicular to the amplitude direction of the first speaker and
the second speaker.
[0012]
The at least one baffle plate further includes at least one baffle plate, and a sound passing
through the first sound path is directed in a direction parallel to an amplitude direction of the
first speaker and the second speaker. May be formed.
[0013]
The at least one baffle plate further includes at least one baffle plate, and the sound passing
through the first sound path is directed in a direction perpendicular to the amplitude direction of
the first speaker and the second speaker. May be formed.
[0014]
A third speaker, and a second spacer separating the second speaker and the third speaker such
that the second speaker and the third speaker face each other, the second speaker And the
second speaker and the third speaker are disposed such that opposing surfaces of the second
speaker and the third speaker output sounds of the same phase, and the second speaker, the
third speaker, and the third speaker are disposed. The second spacer may form a second sound
path through which the sound output from the facing surfaces of the second speaker and the
third speaker may pass.
[0015]
The second sound path may be formed such that the transmission direction of sound passing
through the second sound path is perpendicular to the amplitude direction of the second speaker
and the third speaker.
[0016]
The at least one baffle plate further includes at least one baffle plate, and the sound passing
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through the second sound path is directed in a direction parallel to the amplitude direction of the
second speaker and the third speaker. May be formed.
[0017]
The at least one baffle plate further includes at least one baffle plate, and the sound passing
through the second sound path is directed in a direction perpendicular to the amplitude direction
of the second speaker and the third speaker. May be formed.
[0018]
The first sound path and the second sound path are formed such that the transmission direction
of the sound passing through the first sound path and the transmission direction of the sound
passing through the second sound path are opposite to each other. It may be
[0019]
The first speaker and the second speaker have the same structure, and the first speaker and the
second speaker include the surface of the first speaker and the second speaker. Or the back
surface of the first speaker and the back surface of the second speaker face each other, and the
first speaker and the second speaker have the same phase. The amplitude may be
[0020]
The first speaker and the second speaker have the same structure, and the first speaker and the
second speaker include the surface of the first speaker and the second speaker. Of the first
speaker and the front surface of the second speaker face each other such that the back surface of
the first speaker faces the back surface of the first speaker, and the first speaker and the second
speaker are in antiphase The amplitude may be
[0021]
Each of the first speaker and the second speaker is a piezoelectric speaker having a piezoelectric
element, and the polarization direction of the piezoelectric element of the first speaker is
opposite to the polarization direction of the piezoelectric element of the second speaker. The
phase of the electrical signal input to the first speaker may be the same phase as the phase of the
electrical signal input to the second speaker.
[0022]
The phase of the electrical signal input to the first speaker may be opposite to the phase of the
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electrical signal input to the second speaker.
[0023]
Each of the first speaker and the second speaker is connected to a frame, a diaphragm, a
piezoelectric element disposed on the diaphragm, the frame and the diaphragm, and the
diaphragm is A damper for supporting the diaphragm so as to enable linear amplitude, and an
edge formed to fill a gap between the diaphragm, the damper, and the frame, the damper also
serving as an electrode It is also good.
[0024]
The speaker may be an electrodynamic speaker.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0026]
1.
Structure of Speaker System The structure of the speaker system according to the present
invention will be described below.
[0027]
In the following description, unless otherwise stated, a piezoelectric speaker is used as a specific
example of the speaker that is a component of the speaker system.
However, the speaker of the present invention is not limited to the piezoelectric speaker.
Loudspeakers have diaphragms like electrodynamic speakers, electrostatic speakers,
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electromagnetic speakers, etc., and they should be placed in the same way as long as they are
speakers that generate sound in opposite phase on both sides of the diaphragm. Yes, you can get
the same effect.
[0028]
FIG. 1 is a figure for demonstrating the component of the speaker system 100 of this invention.
[0029]
The speaker system 100 according to the present invention comprises a first spacer 101, a
second speaker 103, a third speaker 105, and a first spacer 102 between the first speaker 101
and the second speaker 103. And a second spacer 104 between the second speaker 103 and the
third speaker 105.
[0030]
The first speaker 101, the second speaker 103, and the third speaker 105 are, for example,
piezoelectric speakers having the same physical structure.
[0031]
The first speaker 101 and the second speaker 103 are arranged such that the facing surfaces of
the first speaker 101 and the second speaker 103 output sounds of the same phase.
Similarly, the second speaker 103 and the third speaker 105 are arranged such that the facing
surfaces of the second speaker 103 and the third speaker 105 output the same phase sound.
[0032]
Thus, by arranging the first speaker 101, the second speaker 103, and the third speaker 105, the
phase of the sound output from the surface of the second speaker 103 facing the first speaker
101 is , The phase of the sound output from the surface of the first speaker 101 not facing the
second speaker 103 and the phase of the sound output from the surface of the third speaker 105
facing the second speaker 103 The phase is opposite to the phase of the sound output from the
surface of the second speaker 103 not facing the third speaker 105.
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[0033]
The first spacer 102 has a U or U shape in which a part of the ring is missing so that the
first speaker 101 and the second speaker 103 face each other when the speaker system 100 is
completed. The first speaker 101 and the second speaker 103 are separated.
Similarly, the second spacer 104 has a "U" or "U" shape with an annular portion missing, and
when the speaker system 100 is completed, the second speaker 103 and the third speaker 105
The second speaker 103 and the third speaker 105 are separated to face each other.
[0034]
In FIG. 1, the first spacer 102 and the second spacer 104 are arranged such that the annular
chipped portion of the first spacer 102 and the annular chipped portion of the second spacer
104 are on the opposite side. It is done.
[0035]
FIG. 2 is a diagram on the way of creating the speaker system 100 of the present invention.
[0036]
In FIG. 2, the first spacer 102 and the second spacer 104 shown in FIG. 1 are attached to the
second speaker 103.
[0037]
FIG. 3 is a view on the way of creating the speaker system 100 of the present invention.
[0038]
In FIG. 3, the first speaker 101 is attached to the first spacer 102 to which the second speaker
103 shown in FIG. 2 is attached, and the third spacer is attached to the second speaker 103 to
the third spacer 103. Speaker 105 is attached.
Thus, the speaker structure 150 is formed.
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By mounting at least one baffle plate (not shown in FIG. 3, refer to FIG. 4) to the speaker
structure 150, the speaker system 100 is completed.
[0039]
FIG. 4 shows a cross-sectional view of the loudspeaker system 100 of the present invention.
In the example shown in FIG. 4, the first baffle plate 121 is attached to the first speaker 101, and
the second baffle plate 122 is attached to the third speaker 105.
[0040]
The first speaker 101, the second speaker 103, and the third speaker 105 generate sounds by
amplitude.
Arrows displayed as amplitude direction in FIG. 4 indicate the amplitude directions of the
first speaker 101, the second speaker 103 and the third speaker 105.
The first speaker 101, the second speaker 103, and the third speaker 105 are disposed along the
amplitude direction.
[0041]
The first speaker 101, the second speaker 103, and the first spacer 102 form a first sound path
111 through which sounds output from the facing surfaces of the first speaker 101 and the
second speaker 103 pass. It is done.
[0042]
The second speaker 103, the third speaker 105, and the second spacer 104 form a second sound
path 112 through which sounds output from the facing surfaces of the second speaker 103 and
the third speaker 105 pass. It is done.
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[0043]
The first sound path 111 is formed such that the transmission direction of the sound passing
through the first sound path 111 and the amplitude direction of the first speaker 101 and the
second speaker 103 are perpendicular.
[0044]
The second sound path 112 is formed so that the transmission direction of the sound passing
through the second sound path 112 and the amplitude direction of the second speaker 103 and
the third speaker 105 are perpendicular.
[0045]
The first sound path 111 and the second sound path 112 so that the sound transmission
direction through the first sound path and the sound transmission direction through the second
sound path are opposite (180 degrees opposite). Is preferably formed.
Thus, if the transmission direction of the sound passing through the first sound path 111 is
opposite to the transmission direction of the sound passing through the second sound path 112,
then the transmission direction is different from that in the same direction or 90 degrees.
Installation of the speaker system 100 is facilitated.
[0046]
Note that the sound output from the facing surfaces of the first speaker 101 and the second
speaker 103 is a space defined by the first speaker 101, the second speaker 103, and the first
spacer 102. The sound path 111 of 1 is transmitted to the outside of the speaker system 100
from an annular chip portion of the first spacer 102.
[0047]
The sound output from the facing surfaces of the second speaker 103 and the third speaker 105
is a second space defined by the second speaker 103, the third speaker 105, and the second
spacer 104. The sound path 112 is transmitted to the outside of the speaker system 100 from
the annular notch of the second spacer 104.
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[0048]
In the speaker system 100, two sound paths (a first sound path 111 and a second sound path
112) are formed, and sounds of opposite phases are transmitted from the two sound paths.
This is because the second speaker 103 simultaneously outputs the sound of the opposite phase
from the two opposite sides (that is, the left side and the right side in FIG. 4) and the first speaker
101 and the second speaker 103. Are arranged so that the facing surfaces of the first speaker
101 and the second speaker 103 output the same phase sound, and the second speaker 103 and
the third speaker 105 This is because the facing surfaces of the second speaker 103 and the
third speaker 105 are arranged to output the same phase sound.
[0049]
In the present specification, for convenience, the surface on the left side with respect to the
paper surface is referred to as left surface and the surface on the right side with respect to
the paper surface is referred to as right surface .
[0050]
The sound output from the left side of the first speaker 101 is transmitted in a direction parallel
to the amplitude direction of the first speaker 101.
The sound output from the right side of the second speaker 103 and the sound output from the
left side of the third speaker are transmitted through the second sound path 112.
The sound transmitted through the second sound path 112 is directed by the second baffle plate
122 in a direction parallel to the amplitude direction of the second speaker 103 and the third
speaker 105 (ie, in the first speaker 101). It is directed in the same direction as the transmission
direction of the sound output from the left side.
Further, the phase of the sound output from the left face of the first speaker 101 and the phase
of the sound transmitted through the second sound path 112 are the same.
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[0051]
Therefore, the sound pressure is increased by combining the sound output from the left side of
the first speaker 101 and the sound transmitted through the second sound path 112.
The flow of these sounds is shown as a solid line 131 in FIG.
[0052]
The sound output from the right surface of the third speaker 105 is transmitted in a direction
parallel to the amplitude direction of the third speaker 105.
The sound output from the right side of the first speaker 101 and the sound output from the left
side of the second speaker 103 are transmitted through the first sound path 111.
The sound transmitted through the first sound path 111 is directed by the first baffle plate 121
in a direction parallel to the amplitude direction of the first speaker 101 and the second speaker
103 (ie, in the third speaker 105). It is directed in the same direction as the transmission
direction of the sound output from the right side.
Further, the phase of the sound output from the right surface of the third speaker 105 is the
same as the phase of the sound transmitted through the first sound path 111.
[0053]
Therefore, the sound pressure is increased by combining the sound output from the right surface
of the third speaker 105 and the sound transmitted through the first sound path 111.
The flow of these sounds is shown as a dashed line 132 in FIG.
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[0054]
The first baffle plate 121 and the second baffle plate 122 are provided such that the sound
indicated by the solid line 131 and the sound indicated by the broken line 132 do not mix.
As a result, the sound indicated by the solid line 131 and the sound indicated by the broken line
132 cancel each other, and the sound pressure is prevented from decreasing.
[0055]
The user of the speaker system 100 can listen to either the sound flow indicated by the solid line
131 or the sound flow indicated by the broken line 132.
[0056]
It should be noted that, in the present specification, the "direction of sound transmission" refers
to the basic direction of sound transmission, and does not mean that all sounds are transmitted
only in this direction.
The reason is that sound has the property of being transmitted while being diffracted or
reflected.
Therefore, the flow of sound indicated by the solid line 131 or the broken line 132 conceptually
shows the path of sound for the sake of convenience.
[0057]
FIG. 5 is a graph showing acoustic characteristics in a JIS box of the speaker system 100
according to the present invention and one speaker.
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The horizontal axis of the graph shown in FIG. 5 indicates the frequency, and the vertical axis
indicates the sound pressure.
[0058]
The solid line (A) of FIG. 5 shows the sound pressure frequency characteristic of the speaker
system 100, and the broken line (B) of FIG. 5 shows the sound pressure frequency characteristic
of one speaker (for example, the first speaker 101).
In the measurement of the acoustic characteristics, the voltage applied to each speaker is 3.3V.
[0059]
As understood from the comparison of the solid line (A) and the broken line (B) in FIG. 5, the
sound pressure from the speaker system 100 is high over almost the entire band as compared to
the sound pressure from one speaker.
The speaker system 100 outputs high sound pressure particularly in a low frequency band.
[0060]
The subsequent flow of the sound passing through the sound path can be freely set according to
the embodiment.
The speaker system 100 described with reference to FIGS. 1 to 4 shows an aspect in which sound
is transmitted from the two sound paths 111 and 112 in a direction parallel to the amplitude
directions of the three speakers 101, 103 and 105. However, the present invention is not limited
to this.
In the speaker system according to the present invention, sound may be transmitted from the
sound path in any direction, for example, in a direction perpendicular to the amplitude direction
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of the speaker.
[0061]
FIG. 6 shows a cross-sectional view of a loudspeaker system 600 in which sound is transmitted in
a direction perpendicular to the amplitude direction of the loudspeaker.
[0062]
The speaker system 600 includes three speakers (a first speaker 601, a second speaker 603, a
third speaker 605), and two spacers (a first spacer 602, a second spacer 604).
The first spacer 602 separates the first speaker 601 and the second speaker 603 so that the first
speaker 601 and the second speaker 603 face each other.
The second spacer 604 separates the second speaker 603 and the third speaker 605 so that the
second speaker 603 and the third speaker 605 face each other.
[0063]
The first speaker 601, the second speaker 603, and the third speaker 605 generate sounds by
amplitude.
Arrows displayed as amplitude direction in FIG. 6 indicate the amplitude directions of the
first speaker 601, the second speaker 603, and the third speaker 605.
The first speaker 601, the second speaker 603, and the third speaker 605 are disposed along the
amplitude direction.
[0064]
Similar to the speaker system 100, also in the speaker system 600, the first speaker 601, the
second speaker 603, and the first spacer 602 output from the facing surfaces of the first speaker
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601 and the second speaker 603. A first sound path 611 is formed through which the sound to
be played passes.
[0065]
The second speaker 603, the third speaker 605, and the second spacer 604 form a second sound
path 612 through which the sound output from the facing surface of the second speaker 603
and the third speaker 605 passes. It is done.
[0066]
The first sound path 611 is formed such that the transmission direction of the sound passing
through the first sound path 611 is perpendicular to the amplitude direction of the first speaker
601 and the second speaker 603.
[0067]
The second sound path 612 is formed such that the transmission direction of the sound passing
through the second sound path 612 is perpendicular to the amplitude direction of the second
speaker 603 and the second speaker 605.
[0068]
Note that the sound output from the facing surfaces of the first speaker 601 and the second
speaker 603 is a space defined by the first speaker 601, the second speaker 603, and the first
spacer 602. The 1st sound path 611 is transmitted to the outside of the speaker system 600
from the annular missing portion of the first spacer 602.
[0069]
The sound output from the facing surfaces of the second speaker 603 and the third speaker 605
is a second space defined by the second speaker 603, the third speaker 605, and the second
spacer 604. The sound path 612 is transmitted to the outside of the speaker system 600 from
the annular missing portion of the second spacer 604.
[0070]
The speaker system 600 also includes two baffles (a first baffle 621 and a second baffle 622).
[0071]
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The sound output from the left face of the first speaker 601 is directed by the first baffle plate
621 in a direction perpendicular to the amplitude direction of the first speaker 601.
The sound output from the right side of the second speaker 603 and the sound output from the
left side of the third speaker 605 are transmitted through the second sound path 612.
The sound transmitted through the second sound path 612 is directed in a direction
perpendicular to the amplitude direction of the second speaker 603 and the third speaker 605
by the second baffle plate 622 (ie, of the first speaker 601). It is directed in the same direction as
the transmission direction of the sound output from the left side.
The sound output from the left side of the first speaker 601 has the same phase as the sound
transmitted through the second sound path 612.
[0072]
Therefore, the sound pressure is increased by combining the sound output from the left face of
the first speaker 601 and the sound transmitted through the second sound path 612.
The flow of these sounds is shown as a solid line 631 in FIG.
[0073]
The sound output from the right surface of the third speaker 605 is transmitted by the second
baffle plate 622 in the direction perpendicular to the amplitude direction of the third speaker
605.
The sound output from the right side of the first speaker 601 and the sound output from the left
side of the second speaker 603 are transmitted through the first sound path 611.
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The sound transmitted through the first sound path 611 is in the direction perpendicular to the
amplitude direction of the first speaker 601 and the second speaker 603 (that is, the
transmission of the sound output from the right face of the third speaker 605). The same
direction as the direction).
The phase of the sound output from the right surface of the third speaker 605 and the phase of
the sound transmitted through the first sound path 611 are the same.
[0074]
Therefore, the sound pressure is increased by combining the sound output from the right surface
of the third speaker 605 and the sound transmitted through the first sound path 611.
The flow of these sounds is shown as dashed line 632 in FIG.
[0075]
The first baffle plate 621 and the second baffle plate 622 are provided so that the sound
indicated by the solid line 631 and the sound indicated by the broken line 632 do not mix.
As a result, the sound indicated by the solid line 631 and the sound indicated by the broken line
632 cancel each other, and the sound pressure is prevented from decreasing.
[0076]
Thus, the sound output from the speaker system may be in a direction perpendicular to the
amplitude direction of the speaker.
In this case, since the sound can be output in a direction other than the direction parallel to the
amplitude direction of the speaker system, the degree of freedom in the installation of the
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speaker system is increased.
[0077]
The number of speakers included in the speaker system of the present invention is not limited to
three, and the number of spacers included in the speaker system of the present invention is not
limited to two.
The speaker system according to the present invention may include n (n is an integer of 2 or
more) speakers and n-1 spacers.
[0078]
In this case, the even-numbered speakers and the odd-numbered speakers are arranged such that
the facing surfaces of the even-numbered speakers and the odd-numbered speakers output the
same phase sound.
By arranging the even-numbered speakers and the odd-numbered speakers in this way, sounds of
the same phase are synthesized, and the sound pressure is increased. As the number of
loudspeakers increases, the sound pressure is further increased because the sound of the same
phase is further synthesized (see FIG. 13).
[0079]
The following modes can be considered in order to output sounds in which the facing surfaces of
the even-numbered speaker and the odd-numbered speaker have the same phase.
[0080]
In the first mode, even-numbered speakers and odd-numbered speakers having the same
structure are used, and the surface of even-numbered speakers and the surface of odd-numbered
speakers face each other, or even The even-numbered speakers and the odd-numbered speakers
are disposed such that the back of the first speaker and the back of the odd-numbered speakers
face each other, and the even-numbered speakers and the odd-numbered speakers are the same.
This is an aspect in which amplitude is performed in phase.
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[0081]
As described above, in order to arrange the even-numbered loudspeakers and the odd-numbered
loudspeakers, for example, the first loudspeaker 101 (odd-numbered loudspeakers) and the
second loudspeaker having physically the same structure The surface of the first speaker 101
faces the surface of the second speaker 103 using the third speaker 105 (even-numbered
speaker) and the third speaker 105 (odd-numbered speaker), and the second speaker The first
speaker 101, the second speaker 103, and the third speaker 105 may be disposed so that the
back surface of the third speaker 103 faces the back surface of the third speaker 105.
[0082]
In order to make the even-numbered speakers and the odd-numbered speakers have the same
phase and amplitude, for example, electrical signals of the same phase may be input to the evennumbered speakers and the odd-numbered speakers.
[0083]
The second mode uses the even-numbered speakers and the odd-numbered speakers having the
same structure, and the front surface of the even-numbered speakers and the back surface of the
odd-numbered speakers face each other, or The even numbered speakers and the odd numbered
speakers are arranged so that the back of the first speaker and the front surface of the odd
numbered speakers face each other, and the even numbered speakers and the odd numbered
speakers This is an aspect in which amplitude is performed in reverse phase.
[0084]
As described above, in order to arrange the even-numbered loudspeakers and the odd-numbered
loudspeakers, for example, the first loudspeaker 101 (odd-numbered loudspeakers) and the
second loudspeaker having physically the same structure 103 (even-numbered sheet speaker)
and the third speaker 105 (odd-numbered sheet speaker), the front surface of the first speaker
101 and the back surface of the second speaker 103 face each other, and the second speaker
The first speaker 101, the second speaker 103, and the third speaker 105 may be disposed such
that the front surface 103 and the back surface of the third speaker 105 face each other.
[0085]
In order to make the even-numbered loudspeakers and the odd-numbered loudspeakers have
opposite phase amplitudes, for example, electrical signals of opposite phases may be input to the
even-numbered loudspeakers and the odd-numbered loudspeakers.
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[0086]
Alternatively, each of the even-numbered speaker and the odd-numbered speaker is a
piezoelectric speaker having a piezoelectric element, and the polarization direction of the
piezoelectric element of the even-numbered speaker is the polarization direction of the
piezoelectric element of the odd-numbered speaker The even-numbered speakers and the oddnumbered speakers may be arranged in the opposite direction to the above, and electric signals
of the same phase may be input to the even-numbered speakers and the odd-numbered speakers.
[0087]
In addition, the shape of a spacer is not limited to the 1st spacer 102 and the 2nd spacer 104
which were demonstrated with reference to FIGS.
The spacer according to the present invention is configured to separate even-numbered speakers
and odd-numbered adjacent speakers so as to face each other, and to prevent opposite-phase
sounds output from the respective speakers from being synthesized with each other. If it is
[0088]
The first sound path 111 and the second sound path 111 can be obtained by adjusting the
thickness of the first spacer 102 or the second spacer 104 or the width of the first sound path
111 or the second sound path 112. It is possible to change the acoustic characteristic outputted
from each of the sound paths 112.
[0089]
Furthermore, although the first spacer 102 and the second spacer 104 described with reference
to FIGS. 1 to 4 have the same shape, the present invention is not limited thereto.
The spacers of the speaker system according to the present invention may have different shapes
for the plurality of spacers used in one speaker system.
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[0090]
Moreover, when using the speaker which has a shape different from the thin-shaped speaker
mentioned above when producing the speaker system by this invention, it is preferable to use the
spacer according to the speaker.
[0091]
In the above description, although the U-shaped or U-shaped spacer is used, if the diaphragm has
another shape such as a round shape, a spacer suitable for the shape may be used.
[0092]
As described above, the even-numbered speakers and the odd-numbered speakers are disposed
so that the faces of the even-numbered speakers and the odd-numbered speakers face the same
phase, and the even-numbered speakers The even numbered speaker and the odd numbered
speaker adjacent to it use the spacer which separates the even numbered speaker and the odd
numbered speaker adjacent to each other so that the odd numbered speaker and the adjacent
odd numbered speaker face each other. And the spacer that separates the even-numbered
speakers from the odd-numbered speakers adjacent thereto, the sound path passing through the
sound output from the facing surface of the even-numbered speakers and the adjacent oddnumbered speakers is By forming, while having the same surface area as one speaker, a large
sound pressure can be obtained without the sound being canceled by the sound in antiphase. .
[0093]
2.
Speaker System Using a Speaker Separate from the Piezoelectric Speaker With reference to FIGS.
1 to 6, as a specific example of the speaker in the speaker system, the case where the speaker is
a piezoelectric speaker has been described.
However, as described above, the speaker is not limited to the piezoelectric speaker.
Here, a speaker system using an electrodynamic speaker will be described as another specific
example of the speaker.
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[0094]
FIG. 7 shows a cross-sectional view of a loudspeaker system 700 having an electrodynamic
loudspeaker.
[0095]
The speaker system 700 includes three speakers (a first speaker 701, a second speaker 703, and
a third speaker 705) and two spacers (a first spacer 702, a second spacer 704).
The first spacer 702 separates the first speaker 701 and the second speaker 703 so that the first
speaker 701 and the second speaker 703 face each other.
The second spacer 704 separates the second speaker 703 and the third speaker 705 such that
the second speaker 703 and the third speaker 705 face each other.
[0096]
The first speaker 701, the second speaker 703, and the third speaker 705 generate sounds by
amplitude.
Arrows displayed as amplitude direction in FIG. 7 indicate the amplitude directions of the
first speaker 701, the second speaker 703, and the third speaker 705.
The first speaker 701, the second speaker 703, and the third speaker 705 are disposed along the
amplitude direction.
[0097]
Similar to the speaker system 100, also in the speaker system 700, the first speaker 701, the
second speaker 703, and the first spacer 702 make it possible to output from the opposite
surface of the first speaker 701 and the second speaker 703. A first sound path 711 through
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which the sound to be played passes is formed.
[0098]
The second speaker 703, the third speaker 705, and the second spacer 704 form a second sound
path 712 through which the sound output from the facing surface of the second speaker 703
and the third speaker 705 passes. It is done.
[0099]
The first sound path 711 is formed such that the transmission direction of the sound passing
through the first sound path 711 is perpendicular to the amplitude direction of the first speaker
701 and the second speaker 703.
[0100]
The second sound path 712 is formed such that the transmission direction of the sound passing
through the second sound path 712 is perpendicular to the amplitude direction of the second
speaker 703 and the second speaker 705.
[0101]
The sound output from the facing surfaces of the first speaker 701 and the second speaker 703
is a first space defined by the first speaker 701, the second speaker 703, and the first spacer
702. The sound path 711 is transmitted to the outside of the speaker system 700 from the
annular chip of the first spacer 702.
[0102]
The sound output from the facing surfaces of the second speaker 703 and the third speaker 705
is a second space defined by the second speaker 703, the third speaker 705, and the second
spacer 704. The sound path 712 is transmitted to the outside of the speaker system 700 from
the annular chip of the second spacer 704.
[0103]
The sound output from the left face of the first speaker 701 is transmitted in a direction parallel
to the amplitude direction of the first speaker 701.
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The sound output from the right side of the second speaker 703 and the sound output from the
left side of the third speaker 705 are transmitted through the second sound path 712.
The sound transmitted through the second sound path 712 is directed by the second baffle plate
722 in a direction parallel to the amplitude direction of the second speaker 703 and the third
speaker 705 (ie, in the first speaker 701). It is directed in the same direction as the transmission
direction of the sound output from the left side.
Also, the phase of the sound output from the left face of the first speaker 701 and the phase of
the sound transmitted through the second sound path 712 are the same.
[0104]
Therefore, the sound pressure is increased by combining the sound output from the left side of
the first speaker 701 and the sound transmitted through the second sound path 712.
The flow of these sounds is shown as a solid line 731 in FIG.
[0105]
The sound output from the right side of the third speaker 705 is transmitted in a direction
parallel to the amplitude direction of the third speaker 705.
The sound output from the right side of the first speaker 701 and the sound output from the left
side of the second speaker 703 are transmitted through the first sound path 711.
The sound transmitted through the first sound path 711 is directed by the first baffle plate 721
in a direction parallel to the amplitude directions of the first speaker 701 and the second speaker
703 (ie, in the third speaker 705). It is directed in the same direction as the transmission
direction of the sound output from the right side.
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Further, the phase of the sound output from the right surface of the third speaker 705 and the
phase of the sound transmitted through the first sound path 711 are the same.
[0106]
Therefore, the sound pressure is increased by combining the sound output from the right surface
of the third speaker 705 and the sound transmitted through the first sound path 711.
The flow of these sounds is shown as a dashed line 732 in FIG.
[0107]
The first baffle plate 721 and the second baffle plate 722 are provided so that the sound
indicated by the solid line 731 and the sound indicated by the broken line 732 do not mix.
As a result, the sound indicated by the solid line 731 and the sound indicated by the broken line
732 cancel each other, and the sound pressure is prevented from decreasing.
[0108]
FIG. 8 is a graph showing acoustic characteristics of a speaker system 700 using an
electrodynamic speaker and a JIS box of one electrodynamic speaker.
The horizontal axis of the graph shown in FIG. 8 indicates the frequency, and the vertical axis
indicates the sound pressure.
[0109]
(A) of FIG. 8 shows the sound pressure frequency characteristic of the speaker system 700, and
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25
(B) of FIG. 8 shows the sound pressure frequency characteristic of one speaker. In the
measurement of the acoustic characteristics, the voltage applied to each of the dynamic speakers
is 0.89 V. Also, the impedance is 8 Ω.
[0110]
As understood from the comparison between the solid line (A) and the broken line (B) in FIG. 8,
as in the case of the piezoelectric speaker, even in the case of the electrodynamic speaker, the
sound pressure from the speaker system 700 is Compared to the sound pressure from an
electrodynamic speaker, it is high over almost the entire band.
[0111]
3.2 Speaker System Having Two Speakers With reference to FIGS. 1 to 8, a speaker system
comprising three speakers and two spacers has been described.
However, the speaker system according to the present invention is not limited to this. The
loudspeaker system according to the invention may comprise two loudspeakers and one spacer.
[0112]
FIG. 9 shows a cross-sectional view of a loudspeaker system 900 according to the invention,
comprising two loudspeakers and one spacer.
[0113]
In the speaker system 900, the first speaker 901, the second speaker 903, and the first speaker
901 and the second speaker 903 separate the first speaker 901 and the second speaker 903
such that the first speaker 901 and the second speaker 903 face each other. And a spacer 902.
[0114]
The first speaker 901 and the second speaker 903 generate sounds by amplitude.
The arrow indicated as
amplitude direction
in FIG. 9 indicates the amplitude direction of the
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first speaker 901 and the second speaker 903.
The first speaker 901 and the second speaker 903 are arranged along the amplitude direction.
[0115]
Similar to the speaker system 100, also in the speaker system 900, the first speaker 901, the
second speaker 903, and the first spacer 902 output from the facing surfaces of the first speaker
901 and the second speaker 903. A first sound path 911 of the sound to be played is formed.
[0116]
The first sound path 911 is formed so that the transmission direction of the sound passing
through the first sound path 911 is perpendicular to the amplitude direction of the first speaker
901 and the second speaker 903.
[0117]
Note that the sound output from the facing surfaces of the first speaker 901 and the second
speaker 903 is a space defined by the first speaker 901, the second speaker 903 and the first
spacer 902. The sound path 911 of 1 is transmitted to the outside of the speaker system 900
from the annular chip of the first spacer 902.
[0118]
The speaker system 900 also includes two baffles (a first baffle 921 and a second baffle 922).
[0119]
The sound output from the left surface of the first speaker 901 is transmitted in a direction
parallel to the amplitude direction of the first speaker 901.
The sound output from the right surface of the second speaker 903 is a direction parallel to the
amplitude direction of the second speaker 903 by the second baffle plate 922 (ie, the sound
output from the left surface of the first speaker 901). The same direction as the direction of
transmission).
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Further, the phase of the sound output from the left side of the first speaker 901 and the phase
of the sound output from the right side of the second speaker 903 are the same.
[0120]
Therefore, the sound pressure is increased by combining the sound output from the left surface
of the first speaker 901 and the sound output from the right surface of the second speaker 903.
The flow of these sounds is shown as a solid line 931 in FIG.
[0121]
The sound output from the right surface of the first speaker 901 and the sound output from the
left surface of the second speaker 903 are transmitted through the first sound path 911.
The sound transmitted through the first sound path 911 is directed by the first baffle plate 921
in a direction parallel to the amplitude direction of the first speaker 901 and the second speaker
903. The flow of these sounds is shown as a broken line 932 in FIG.
[0122]
The first baffle plate 921 and the second baffle plate 922 are provided so that the sound
indicated by the solid line 931 and the sound indicated by the broken line 932 do not mix. As a
result, the sound indicated by the solid line 931 and the sound indicated by the broken line 932
cancel each other out, and the sound pressure is prevented from decreasing.
[0123]
Thus, the present invention can be applied to a speaker system 900 including two speakers 901
and 903 and one spacer 902.
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[0124]
In the speaker system having three speakers, as in the speaker system 600 in which sound is
transmitted in the direction substantially perpendicular to the amplitude direction of the
speakers, the speaker amplitude direction also in the speaker system having two speakers A
speaker system is conceivable in which sound is output in a direction substantially perpendicular
to.
[0125]
FIG. 10 shows a cross-sectional view of a speaker system 1000 having two speakers and in which
sound is output from a direction perpendicular to the amplitude direction of the speakers.
[0126]
The speaker system 1000 is configured such that the first speaker 1001, the second speaker
1003, and the first speaker 1001 and the second speaker 1003 separate the first speaker 1001
and the second speaker 1003 so that they face each other. And one spacer 1002.
[0127]
The first speaker 1001 and the second speaker 1003 generate sounds by amplitude.
Arrows displayed as amplitude direction in FIG. 10 indicate the amplitude directions of the
first speaker 1001 and the second speaker 1003.
The first speaker 1001 and the second speaker 1003 are disposed along the amplitude direction.
[0128]
Similar to the speaker system 100, also in the speaker system 1000, the first speaker 1001, the
second speaker 1003, and the first spacer 1002 output from the facing surfaces of the first
speaker 1001 and the second speaker 1003. A first sound path 1011 of the sound to be played
is formed.
[0129]
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The first sound path 1011 is formed such that the transmission direction of the sound passing
through the first sound path 1011 and the amplitude direction of the first speaker 1001 and the
second speaker 1003 are perpendicular.
[0130]
Note that the sound output from the facing surfaces of the first speaker 1001 and the second
speaker 1003 is a space defined by the first speaker 1001, the second speaker 1003, and the
first spacer 1002. The sound path 1011 of 1 is transmitted to the outside of the speaker system
1000 from the annular cutout portion of the first spacer 1002.
[0131]
The speaker system 1000 also includes two baffles (a first baffle 1021 and a second baffle
1022).
The sound output from the left face of the first speaker 1001 is directed by the first baffle plate
1021 in a direction perpendicular to the amplitude direction of the first speaker 1001.
The sound output from the right surface of the second speaker 1003 is a direction perpendicular
to the amplitude direction of the second speaker 1003 by the second baffle plate 1022 (ie, the
sound output from the left surface of the first speaker 1001). It is directed in the same direction
as the transmission direction.
Further, the sound output from the left surface of the first speaker 1001 has the same phase as
the sound output from the right surface of the second speaker 1003.
[0132]
Therefore, the sound pressure is increased by combining the sound output from the left surface
of the first speaker 1001 and the sound output from the right surface of the second speaker
1003.
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The flow of these sounds is shown as a solid line 1031 in FIG.
[0133]
The sound output from the right side of the first speaker 1001 and the sound output from the
left side of the second speaker 1003 are transmitted through the first sound path 1011.
The sound transmitted through the first sound path 1011 is directed in a direction perpendicular
to the amplitude direction of the first speaker 1001 and the second speaker 1003. The flow of
these sounds is shown as a broken line 1032 in FIG.
[0134]
The first baffle plate 1021 and the second baffle plate 1022 are provided such that the sound
indicated by the solid line 1031 and the sound indicated by the broken line 1032 do not mix. As
a result, the sound indicated by the solid line 1031 and the sound indicated by the broken line
1032 cancel each other and the sound pressure is prevented from decreasing.
[0135]
Thus, the sound output from the speaker system 1000 having two speakers may be in a direction
perpendicular to the amplitude direction of the speakers.
[0136]
As described above, a spacer is disposed so that the two speakers face each other, and the two
speakers and the spacer form a sound path of the sound output from the facing surfaces of the
two speakers, thereby forming a single speaker While having the same surface area, a large
sound pressure can be obtained without the sound being canceled by the sound in antiphase.
[0137]
4.
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Structure of Piezoelectric Speaker Here, a piezoelectric speaker that can be used for the speaker
system of the present invention will be described.
[0138]
FIG. 11 is a top view showing the structure of the piezoelectric speaker 1100. As shown in FIG.
[0139]
The piezoelectric speaker 1100 includes an outer frame 1110, an inner frame 1120, diaphragms
1131 to 1134, and a piezoelectric element 1140 transmitting an amplitude to the diaphragms
1131 to 1134.
[0140]
The diaphragm 1131 is connected to the inner frame 1120 via the dampers 1151 and 1152.
The diaphragm 1132 is connected to the inner frame 1120 via the dampers 1153 and 1154.
The diaphragm 1133 is connected to the inner frame 1120 via the dampers 1155 and 1156.
The diaphragm 1134 is connected to the inner frame 1120 via the dampers 1157 and 1158.
[0141]
The inner frame 1120 is connected to the outer frame 1110 via the dampers 1161 to 1164. The
outer frame 1110 is fixed to a fixing member (not shown) of the piezoelectric speaker 1100.
[0142]
The dampers 1151 to 1158 and the dampers 1161 to 1164 are called
because of their shapes.
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butterfly dampers
[0143]
The dampers 1151 and 1152 support the diaphragm 1131 so that the diaphragm 1131 can be
linearly amplified.
Here, in the present specification, the diaphragm 1131 can be linearly amplified means that
the diaphragm 1131 maintains the state in which the surface of the diaphragm 1131 and the
reference surface are substantially parallel, and the diaphragm 1131 It is defined as amplitude
in a direction substantially perpendicular to the surface . The same definition applies to the
diaphragms 1132-1134. For example, it is assumed that the outer frame 1110 is fixed to the
same plane (reference plane) as the paper surface of FIG. In this case, the diaphragm 1131 is in
the direction in which the diaphragm 1131 is substantially perpendicular to the paper surface of
FIG. 11 while the plane of the diaphragm 1131 and the paper surface of FIG. Be supported to
swing.
[0144]
Similarly, the dampers 1153 and 1154 support the diaphragm 1132 so that the diaphragm 1132
can be linearly amplified, and the dampers 1155 and 1156 allow the diaphragm 1133 to be
linearly amplified. Supporting, the dampers 1157, 1158 support the diaphragm 1134 so that the
diaphragm 1134 can be linearly oscillated.
[0145]
The dampers 1161 to 1164 support the diaphragms 1131 to 1134 so that the diaphragms 1131
to 1134 can be linearly amplified at the same time.
[0146]
When the dampers (1151 to 1158, 1161 to 1164) are formed of metal, these dampers can be
used as electrode wiring.
The piezoelectric element 1140 is electrically connected to the diaphragm (1131 to 1134), and
the diaphragm (1131 to 1134) is electrically connected to the inner frame 1120 via the damper
(1151 to 1158), and the inner frame 1120 Are electrically connected to the outer frame 1110
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via the dampers (1161 to 1164).
Thus, it becomes possible to input a signal from the outer frame 1110 to the piezoelectric
element 1140.
[0147]
Piezoelectric speaker 1100 has an edge 1171 formed to prevent air from leaking from the gap
between diaphragms 1131 to 1134 and inner frame 1120, and air may leak from the gap
between inner frame 1120 and outer frame 1110. And an edge 1172 formed to prevent it. When
air leaks from the gap between the diaphragms 1131 to 1134 and the inner frame 1120 or the
gap between the inner frame 1120 and the outer frame 1110, sounds in antiphase generated
before and after the diaphragms 1131 to 1134 interfere with each other. This reduces the sound
pressure. The edges 1171 and 1172 are formed to prevent such air leaks, thereby preventing a
drop in sound pressure in a low frequency band in which characteristic degradation is
remarkable. As a result, according to the piezoelectric speaker 1100, it is possible to reproduce
sound in a frequency band lower than that of the conventional piezoelectric speaker.
[0148]
Furthermore, the edges 1171 and 1172 function as part of a support member that supports the
diaphragms 1131 to 1134. By supporting the peripheries of the diaphragms 1131 to 1134 by
the edges 1171 and 1172, the amplitude movement of the diaphragms 1131 to 1134 is
facilitated. If the edges 1171 and 1172 do not function as support members for the diaphragms
1131 to 1134 and only the dampers 1151 to 1158 and 1161 to 1164 function as support
members for the diaphragms 1131 to 1134, the diaphragms 1131 to 1134 Is likely to go wild in
a direction that is not desired in a particular frequency band. As a result, unnecessary resonance
is likely to occur.
[0149]
In the present embodiment, although the above-described speaker is used, the effect of
increasing the sound pressure does not change even if a piezoelectric element having a simple
structure in which a piezoelectric element is attached to a conventional single-plate metal
diaphragm is used. .
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[0150]
Although a rectangular diaphragm is used in the piezoelectric speaker 1100, the present
invention is not limited to this.
The shape of the diaphragm may be round.
[0151]
In such a piezoelectric speaker 1100, the diaphragm is supported so that the diaphragm can be
linearly oscillated, air is prevented from leaking from the gap between the diaphragm and the
frame, and the amplitude of the diaphragm is increased. The edge is formed as a support member
to keep it flatter. This makes it possible to reproduce sound in a lower frequency band as
compared to a conventional piezoelectric speaker.
[0152]
According to the speaker system of the present invention, the first speaker and the second
speaker are arranged such that the facing surfaces of the first speaker and the second speaker
output the same phase sound. The first speaker, the second speaker, and the first spacer form a
sound path of sound output from the facing surface of the first speaker and the second speaker.
As a result, it is possible to provide a speaker system capable of maintaining the same surface
area as the surface area when using a single speaker while increasing the sound pressure using a
plurality of speakers.
[0153]
Also, the speaker system of the present invention is not limited to one including two speakers
and one spacer. The speaker system of the present invention may include n speakers and n-1
spacers (n is an integer of 2 or more). According to such a speaker system, the even-numbered
speakers and the odd-numbered speakers are configured such that the faces of the evennumbered speakers and the odd-numbered speakers of the n number of speakers output the
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35
same phase sound. The even numbered speaker is arranged, and the even numbered speaker is
provided so that the even numbered speaker and the adjacent odd numbered speaker face each
other. A spacer is provided to separate the even numbered speaker and the adjacent odd
numbered speaker. An even numbered speaker and an odd numbered speaker adjacent to the
speaker by the eye speaker, an odd numbered speaker adjacent to it, and a spacer separating the
even numbered speaker and the odd numbered speaker adjacent to it A sound path is formed
through which the sound output from the opposite surface of As a result, it is possible to provide
a speaker system capable of maintaining the same surface area as the surface area when using a
single speaker while increasing the sound pressure using a plurality of speakers.
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