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JP2005027020

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DESCRIPTION JP2005027020
An object of the present invention is to provide a speaker module capable of extending the reach
of sound while suppressing an increase in the number of speakers. A flat speaker unit 10 on one
side (arrow L direction) and a flat speaker unit 10 on the other side (arrow R direction) are
disposed substantially in the same direction (arrow F direction) and slightly inward. Attach the
equalizer 104 between the Plane waves are emitted from both diaphragms 16 in the vertical
direction, and the plane waves radiated from both diaphragms 16 are synthesized on the axis
between the two and sound can reach far. The equalizer 104 suppresses the interference
(cancellation) between the plane wave radiated from one diaphragm 16 in the unit and the plane
wave radiated from the other diaphragm 16 in the vicinity of the diaphragm, so that the sound is
generated on the middle axis of both diaphragms 16. The pressure level can be reliably
increased. [Selected figure] Figure 1
Speaker module and SR speaker system
[0001] The present invention relates to a speaker module and an SR speaker system in which a
plurality of speaker modules are connected, and relates to a speaker module capable of extending
a sound reach distance and an SR speaker system. 2. Description of the Related Art In a large
place such as a concert hall, SR (sound reinforcement) speakers are used to allow sounds to reach
distant places. Currently, most of the market for SR speakers is occupied by line array speaker
systems. In the conventional line array speaker system, for example, there is a type in which a
plurality of enclosures are vertically stacked, or a type in which a plurality of enclosures are
vertically stacked to be slightly curved at an angle of several degrees, etc. (For example, V-DOSC
system: see Non-Patent Document 1). [Non-Patent Document 1] Internet website of Japan MSI
Co., Ltd. (http://msi-japan.com. As of June 26, 2003) [0006] When trying to reach a further
distance by using the conventional line array speaker system, the number of speakers can be
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increased, and the amplifier However, it is expensive to increase the number of speakers, and
there is a limit in increasing the output of the amplifier in relation to the input resistance of the
speakers. The present invention has been made to solve the above problems, and it is an object of
the present invention to provide a speaker module capable of extending the sound reach distance
while suppressing an increase in the number of speakers, and an SR speaker system. It is.
SUMMARY OF THE INVENTION As a result of various experimental studies conducted by the
inventor, it is possible to extend the reach of sound by using a speaker that radiates a plane wave
as compared to the case of using a cone speaker. Furthermore, I found out that the reach of
sound can be further extended by combining a plurality of speakers optimally. The invention
according to claim 1 is made in view of the above-mentioned fact, and the first speaker provided
with a planar first diaphragm for emitting a plane wave, and a plane for emitting a plane wave
And a second speaker provided with a second diaphragm having the same shape, wherein the
first diaphragm and the second diaphragm are mutually adjacent and substantially identical to
each other. The first speaker and the second speaker are disposed so as to face in the direction
and inward with respect to the radiation direction side of the plane wave, and between the first
diaphragm and the second diaphragm Further, the present invention is characterized in that
interference prevention means is disposed for suppressing the interference between the plane
wave radiated from the first diaphragm and the plane wave radiated from the second diaphragm.
Next, the operation of the speaker module according to claim 1 will be described. A plane wave is
radiated from the first diaphragm of the first speaker in the vertical direction of the first
diaphragm, and the second diaphragm of the second speaker is a second diaphragm. A plane
wave is emitted in the vertical direction of. Here, since the first diaphragm and the second
diaphragm are adjacent to each other and directed in substantially the same direction and are
directed inward with respect to the radiation direction side of the plane wave, the first diaphragm
The sound pressure level is increased by combining the plane wave radiated from the plane wave
and the plane wave radiated from the second diaphragm on the axis between the first diaphragm
and the second diaphragm, so that they do not turn inward. Compared to the case, the sound can
reach far. If the first diaphragm and the second diaphragm are simply made to be adjacent to
each other and directed in substantially the same direction and inward with respect to the
radiation direction side of the plane wave, the first diaphragm Among the plane waves radiated
from the diaphragm, the plane wave radiated from near the end on the second diaphragm side
and the vicinity of the end on the first diaphragm side among the plane waves radiated from the
second diaphragm Of the sound pressure level on the axis between the first diaphragm and the
second diaphragm. Although the increase may be inhibited, in the present invention, the
interference preventing means suppresses the interference between the plane wave radiated
from the first diaphragm and the plane wave radiated from the second diaphragm, so that the
first vibration is generated. It is possible to ensure that the sound pressure level is increased on
the axis between the plate and the second diaphragm. come. The SR speaker system according to
claim 2 is characterized in that a plurality of the speaker modules according to claim 1 are
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connected such that the interference preventing means are arranged in a straight line. Next, the
operation of the SR speaker system according to claim 2 will be described. In the SR speaker
system according to the second aspect of the present invention, since the plurality of speaker
modules are arranged in a straight line, the sound can be made to reach farther. An SR speaker
system according to claim 3 is characterized in that a plurality of the speaker modules according
to claim 1 are arranged in a matrix on the same plane. In the SR speaker system according to the
third aspect of the present invention, since the plurality of speaker modules are arranged in the
form of a matrix, it is possible to reach far and wide range sound and extend the low range.
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will
be described with reference to FIGS. 1 to 11. As shown in FIG. 10, an MPA (Multi-Purpose-Array)
SR speaker system 102 according to the present embodiment is formed by connecting a plurality
of speaker modules 100 shown in FIG. 11 in a matrix. As shown in FIG. 11, the speaker module
100 is provided with a pair of flat speaker units 10 and a phase plug 104 described later.
(Configuration of Flat Speaker Unit) As shown in FIG. 1, the flat speaker unit 10 according to the
present embodiment includes a first yoke 12, a spacer 14, a diaphragm 16, a spacer 18, and a
second yoke 20 in order. As shown in FIG. 2, the first yoke 12 is made of a magnetic material,
and is formed in a rectangular flat plate elongated in the Y direction in the drawing. As shown in
FIGS. 2 and 3, on the diaphragm side surface of the first yoke 12, a tetragonal permanent magnet
M with the S pole directed to the diaphragm side and an N pole directed to the diaphragm side A
first magnet consisting of two rows of magnet rows of a first magnet row 22 and a second
magnet row 24 alternately arranged at fixed intervals in the X direction which is a direction
orthogonal to the Y direction with the permanent magnet M The groups 26 are provided in a
plurality of rows (eight rows in the present embodiment) at regular intervals in the Y direction.
As shown in FIG. 2, the magnetic pole surface on the diaphragm side of the permanent magnet M
of the first magnet array 22 and the magnetic pole surface on the diaphragm side of the
permanent magnet M of the second magnet array 24 adjacent thereto are , Polarity (S, N in the
figure) are different. As shown in FIG. 4, the second yoke 20 is made of a magnetic material, and
is formed in a rectangular flat plate elongated in the Y direction in the drawing. As shown in
FIGS. 3 and 4, on the diaphragm side surface of the second yoke 20, a permanent magnet M
having a south pole facing the diaphragm and a permanent magnet having a north pole facing
the diaphragm A second magnet group consisting of two magnet rows of a third magnet row 28
and a fourth magnet row 30 alternately arranged at fixed intervals in the X direction which is a
direction orthogonal to the magnet M with the magnet M 32 are provided in a plurality of rows
(seven rows in this embodiment) at regular intervals in the Y direction. As shown in FIG. 4, the
magnetic pole surface of the permanent magnet M on the diaphragm side of the third magnet
array 28 and the magnetic pole surface of the permanent magnet M on the diaphragm side of the
fourth magnet array 30 adjacent thereto are as follows: , Polarity (S, N in the figure) are different.
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As shown in FIG. 3, the first magnet group 26 and the second magnet group 32 are arranged at a
constant interval in the Y direction, and permanent magnets of the first magnet group 26 are
provided. The polarity is different between the pole surface on the diaphragm side of M and the
pole surface on the diaphragm side of the permanent magnet M of the second magnet group 32
adjacent thereto. Each magnetic pole surface of each permanent magnet M of the first magnet
group 26 is opposed to the portion of the second yoke 20 where the permanent magnet M is not
disposed. Each magnetic pole surface of each permanent magnet M is opposed to the portion of
the first yoke 12 where the permanent magnet M is not disposed. The permanent magnets M of
the first magnet group 26 and the permanent magnets M of the second magnet group 32 are
arranged at equal intervals in the arrow Y direction and the arrow X direction. As shown in FIGS.
2 and 5, in the vicinity of the center of the diaphragm-side surface of the first yoke 12, a first
magnet group 26 has a rectangular shape with its pole face facing the diaphragm. Four repelling
permanent magnets RM are arranged respectively. The repelling permanent magnets RM are
disposed at positions facing the permanent magnets M of the second yoke 20, and the polarity
on the diaphragm side is the permanent magnets M of the second yoke 20 facing the opposite
polarity. The repelling permanent magnet RM and the permanent magnet M of the second yoke
20 opposed thereto are set to repel each other. As shown in FIGS. 2 and 4, a large number of
holes 33 are formed in a matrix in each of the first yoke 12 and the second yoke 20. As shown in
FIGS. 1, 3 and 5, a planar diaphragm 16 is disposed between the first yoke 12 and the second
yoke 20 via the spacer 14 and the spacer 18. Each of the spacer 14 and the spacer 18 has a
rectangular frame shape, and the vicinity of the outer periphery of the diaphragm 16 is
sandwiched by the spacer 14 and the spacer 18. As shown in FIGS. 1, 2, 4 and 6, the first yoke
12 has a plurality of screw holes 12A and holes 12B along the outer periphery, and the spacer
14 has a plurality of holes 14A along the outer periphery. A plurality of holes 16A are formed
along the outer periphery of the diaphragm 16, a plurality of holes 18A along the outer
periphery of the spacer 18, and a hole 20A along the outer periphery of the second yoke 20. As
shown in FIGS. 3 and 5, the second yoke 20, the spacer 18, the diaphragm 16, the spacer 14, and
the first yoke 12 are provided with a hole 20A, a hole 18A, a hole 16A, and a hole 14A (see FIG.
In FIG. 3 and FIG. 5, the hole 34 is integrally fixed by being screwed into the screw hole 12A.
The holes 12 B of the first yoke 12 are used for attachment. The diaphragm 16 is spaced apart
from the respective pole faces of the permanent magnet M and the repelling permanent magnet
RM by the spacer 14 and the spacer 18. The diaphragm 16 is made of a polymer film such as
polyimide or polyethylene terephthalate. The vertical and horizontal dimensions of the flat
speaker unit 10 of this embodiment are about 340 mm × about 240 mm, and the vertical and
horizontal dimensions of the diaphragm 16 are about 300 mm × about 200 mm. As shown in
FIG. 6, a first conductor 36 and a second conductor 38 are respectively provided on one side of
the diaphragm 16 and on both sides of the central portion in the X direction. The pattern of the
first conductor 36 and the second conductor 38 is schematically shown in FIG. As shown in FIGS.
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7 and 8, the first conductor 36 and the second conductor 38 are parallel to each other, and as
shown in FIG. And the permanent magnet M, and extends in a zigzag manner from one side to the
other side in the Y direction along the longitudinal direction (the arrow Y direction) of the
magnet array. As shown in FIGS. 7 and 9, the first conductor 36 and the second conductor 38 are
connected such that current flows in the same direction (the direction of the current is shown in
FIG. 7). . The first conductor 36 and the second conductor 38 may be connected in series as
shown in FIG. 7 or may be connected in parallel. Such a first conductor 36 and a second
conductor 38 are formed by laminating, vapor depositing, adhering or the like a metal thin film
of copper or aluminum on the diaphragm 16 and etching this metal thin film Can be configured
by As shown in FIG. 8, in the first conductor 36 and the second conductor 38, a wide portion
linearly extending in the arrow X direction and a wide portion linearly extending in the arrow Y
direction are provided. In the widthwise central portion of the conductor, an elongated region 40
not provided with a metal thin film is provided along the extension direction of the conductor
(the direction orthogonal to the direction of the magnetic field), and the conductor is divided into
two in parallel. Thereby, it is possible to suppress the eddy current generated when the current
of high frequency flows. The number of divisions of the conductor may be three or more. Further,
a wide portion extending linearly in the arrow X direction of the first conductor 36 and the
second conductor 38 and a wide portion extending linearly in the arrow Y direction are each
with respect to the side of the permanent magnet M. It is parallel.
Further, the wide portion linearly extending in the arrow X direction and the wide portion
linearly extending in the arrow Y direction are connected at the shortest distance. (Structure of
Speaker Module) As shown in FIGS. 10 and 11, the pair of flat speaker units 10 are attached to
each other on the left and right of the frame 106 by means of bolts or the like (not shown). In
FIG. 10, the arrow A direction is the vertical direction. Here, the flat speaker unit 10 on one side
(arrow L direction) and the flat speaker unit 10 on the other side (arrow R direction) are disposed
substantially in the same direction (arrow F direction) and slightly inward. ing. In the present
embodiment, the angle (θ 1) between the diaphragm 16 of one flat speaker unit 10 (in the
direction of arrow L) and the diaphragm 16 of the other flat speaker unit 10 (in the direction of
arrow R) is, for example, It is about 2 to 5 degrees. A phase plug 104 extending in the vertical
direction is attached to the frame 106 between one flat speaker unit 10 and the other flat
speaker unit 10. As shown in FIGS. 10 and 11, the phase plug 104 of this embodiment is formed
in an isosceles triangular prism. The phase plug 104 is formed of a relatively hard material such
as wood, metal or synthetic resin. As shown in FIG. 11, in the phase plug 104 of this
embodiment, the height H is set to 80 mm, and the angle (θ2) is set to 30 °. (Operation) Next,
the operation of the present embodiment will be described. In the flat speaker unit 10, when
current I (the direction is shown by an arrow) flows in the first conductor 36 and the second
conductor 38 as shown in FIGS. 7 and 9, the first conductor 36 and the second conductor A force
(electromagnetic force) F (in this case, the direction of the force F on the second yoke 20 side)
acts on the conductor 38 in the direction of the magnetic field H and the direction orthogonal to
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the current I according to Fleming's left-hand rule. Further, when the current I is applied to the
first conductor 36 and the second conductor 38 in the direction opposite to that in FIGS. 7 and 9,
the first conductor 36 and the second conductor 38 A force F acting on the side of the yoke 12
acts. Therefore, the diaphragm 16 provided with the first conductor 36 and the second
conductor 38 flows by passing an electrical signal representing the sound to be generated to the
first conductor 36 and the second conductor 38. Vibrate in response to the electrical signal being
The sound generated by the vibration of the diaphragm 16 passes through the holes 33 formed
in the first yoke 12 and the second yoke 20 and is emitted to the arrow F direction side in FIG.
Since the diaphragm 16 is flat and vibrates in the direction perpendicular to the film surface, the
sound radiated from the diaphragm 16 is a plane wave. A plane wave is emitted from the flat
speaker unit 10 on one side (arrow L direction) in the vertical direction of the diaphragm 16, and
from the flat speaker unit 10 on the other side (arrow R direction) also in the vertical direction A
plane wave is emitted, and the plane waves emitted from both diaphragms 16 are synthesized on
the axis between the two, so that the sound can reach far. In addition, since the phase plug 104
suppresses the interference (cancellation) between the plane wave radiated from one diaphragm
16 in the unit and the plane wave radiated from the other diaphragm 16 in the vicinity of the
diaphragms, The sound pressure level can be reliably increased on the middle axis. In addition, a
speaker system using a cone speaker unit that emits a spherical wave requires a speaker box so
that the sound coming out to the rear side of the cone does not get in front, and in the case of a
large aperture speaker unit, in particular, the speaker box There is a problem that On the other
hand, in the flat speaker unit 10 that radiates a plane wave, the sound coming out to the back
side hardly turns forward, so basically no speaker box is required (in order to prevent the sound
from being emitted to the back side) Although a speaker box may be provided, since the capacity
is not required, the thickness of the speaker box may be thin. Therefore, the use of the speaker
module 100 according to this embodiment can achieve a significant weight reduction as
compared to a conventional speaker system using a cone speaker unit. The dimensions of the
diaphragm 16, the angle (θ1) between the diaphragm 16 of one flat speaker unit 10 and the
diaphragm 16 of the other flat speaker unit 10, the height H of the phase plug 104, and the
angle (θ2) It is not limited to the above embodiment. Further, in the above embodiment,
although a plurality of speaker modules 100 are connected in a matrix in the vertical and
horizontal directions, the present invention is not limited thereto, and a plurality of speaker
modules 100 may be connected linearly in the vertical direction. The speaker module 100 may
be used alone. Test Example FIG. 12 shows a measurement result comparing the case where the
phase plug 104 is present and the case where the phase plug 104 is not present.
For measurement, as shown in FIG. 12, the measurement microphone 108 is moved in the lateral
direction on the sound pressure measurement line separated from the speaker module 100 by
the distance L, and the relationship between the position in the width direction and the sound
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pressure level is graphed. Turned As shown in the graph of the measurement results, it can be
seen that the sound pressure level is higher with the phase plug 104. As described above,
according to the speaker module and the SR speaker system of the present invention, the reach
of sound compared to the conventional one can be achieved without increasing the output of the
amplifier or increasing the number of speakers. Have the excellent effect of being able to stretch.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a flat
loudspeaker according to a first embodiment of the present invention. FIG. 2 is a plan view of a
first yoke. 3 is a sectional view taken along line 3-3 of the flat loudspeaker shown in FIG. 1; FIG. 4
is a plan view of a second yoke. 5 is a cross-sectional view taken along line 5-5 of the flat speaker
shown in FIG. FIG. 6 is a plan view of the diaphragm. FIG. 7 is a schematic view of a first
conductor and a second conductor. FIG. 8 is a partially enlarged view of a first conductor and a
second conductor. FIG. 9 is a schematic view of a cross section of a part of the flat speaker. FIG.
10 is a perspective view of an SR speaker system according to an embodiment of the present
invention. FIG. 11 is a perspective view of a speaker module according to an embodiment of the
present invention. FIG. 12 is an explanatory view showing a measurement method of a speaker
module and measurement results. [Description of the code] 10 flat speaker unit 16 diaphragm
100 speaker module 102 MPASR speaker system 104 phase plug
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