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DESCRIPTION JP2013118496

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DESCRIPTION JP2013118496
Abstract: The present invention provides a line array speaker that reduces the interference of
back pressure between adjacent speakers. A cone-shaped line array speaker in which three or
more speaker units for vibrating a diaphragm by a magnetic circuit unit are attached in parallel
in a row in a longitudinal direction of a rectangular baffle plate 2. Each of the aluminum die-cast
frames 10 having the openings 10a and 10a at the upper and lower sides, the openings 10a and
10a are not provided at least on one side of the speaker unit in the arranging direction, or the
frame 10 of the speaker unit The openings 10a and 10a on the side surfaces in the parallel
direction are smaller in area than the openings 10a and 10a on the other side surfaces. [Selected
figure] Figure 3
ラインアレイスピーカ
[0001]
The present invention relates to a line array speaker including three or more speaker units.
[0002]
Humans grasp the acoustic space by the difference between the magnitude and time of the sound
input to the two ears.
A sound pressure difference is provided to the sound waves emitted from the left and right
speaker units by making the left and right speaker units perceive the sound recorded in stereo by
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utilizing this, and the sound is generated from the position between the speaker units. A method
of perceiving it as if it were present is used.
[0003]
However, due to the fact that sound waves emitted from the left and right speaker units are
attenuated according to the distance, and the propagation time of each sound wave is different, a
sound pressure difference or time difference exists depending on the position. Therefore, for
example, when the sound wave is set on the basis of the listener on the central line equidistant
from the two left and right speaker units installed, the listener at a position other than the central
line can obtain the desired effect by the method described above. The problem of not being done
arises.
[0004]
As a method for solving this problem, there is, for example, WFS (Wave Field Synthesis) which is
one of wavefront synthesis techniques (Non-Patent Document 1). WFS is a technology capable of
reproducing the wave front itself of sound waves by superimposing sound waves respectively
driven by different signals and emitted from the respective speaker units, and perceiving the
sound source at the intended position in a wide range. As a speaker used for WFS, there is a line
array speaker in which three or more speaker units are juxtaposed in a row as shown in Patent
Document 1.
[0005]
FIG. 9 is a schematic view showing a conventional line array speaker. The conventional line array
speaker is provided with an opening in the frame of each speaker unit for releasing a back
pressure generated when sound is emitted by a cone-shaped diaphragm. In such a speaker unit,
the back pressure is released not only in the vibration direction of the diaphragm but also in the
direction in which the speaker units are arranged in the direction perpendicular to the vibration
direction. Interference between back pressure is remarkable. The interference between the back
pressures of the adjacent speaker units causes a problem that a desired wavefront is not
synthesized. Furthermore, a sound wave of a specific frequency is amplified to increase the
amplitude of the diaphragm to cause distortion, and interference between back pressures causes
a problem that the sound wave of a specific frequency is attenuated.
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[0006]
JP 2007-235709 A
[0007]
Berghout, De Bries, Vogel (A. J. Berkhout, D. de Vries, and P. Vogel), "Acoustic control by wave
field synthesis" (Netherlands), 93 (5) Edition, Journal of the Economic Society of America (J.
Acoust.
Soc), May 1993, p. 2764-2778.
[0008]
The object of the present invention is made in view of the subject mentioned above, and is
providing the line array speaker which reduces the interference of the back pressure by the
adjoining speakers.
[0009]
The line array speaker according to the present invention is a line array speaker in which three
or more cone-shaped speaker units are juxtaposed in a line, and the frame of the speaker unit is
not provided with an opening on at least one side in the juxtaposition direction It is characterized
by
[0010]
According to the present invention, since the opening is not provided in at least one of the
juxtaposition direction sides of the frames, the back pressure of the juxtaposition direction
component of the back pressure generated when the speaker unit emits sound is blocked. The
interference of the back pressure by the adjacent speaker unit can be reduced.
[0011]
The line array speaker according to the present invention is a line array speaker in which three
or more cone-type speaker units are juxtaposed in a line, the frame of the speaker unit has an
opening on the side in the juxtaposing direction side more than an opening on the other side It is
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characterized in that the area is small.
[0012]
According to the present invention, it is possible to reduce the interference of the back pressure
on the side in the parallel direction since the openings on the side on the side in the parallel
direction of the frame are smaller in area than the openings on the other side.
In addition, the air resistance of the diaphragm can be reduced by releasing the back pressure
also from the side in the parallel arrangement direction, and sound emission by the diaphragm
can be favorably performed.
[0013]
The line array speaker according to the present invention is characterized in that the speaker
unit includes a magnetic circuit unit, a hole is provided in the frame, and a signal terminal of the
magnetic circuit unit is attached to the hole.
[0014]
According to the present invention, by providing the terminal of the electrode on the frame, there
is no need to provide a terminal plate for blocking the opening.
Therefore, the back pressure can be released without blocking the opening.
[0015]
The line array speaker according to the present invention is characterized in that the holes are
provided on side surfaces of the frame in the side-by-side direction.
[0016]
According to the present invention, since the holes are provided on the side surface in the side in
the direction of arrangement in the frame, it is possible to effectively utilize the side surface in
the direction of the side in the direction of arrangement of the frame.
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[0017]
According to the present invention, since the frame of the speaker unit is not provided with an
opening on at least one side in the side-to-side direction, interference of the back pressure can be
reduced.
In addition, since the opening on the side in the parallel direction side has a smaller area than the
opening on the other side, the interference of back pressure can be similarly reduced.
[0018]
It is a schematic diagram which shows the line array speaker which concerns on 1st
Embodiment.
It is a typical top view of the speaker unit concerning a 1st embodiment.
It is a typical rear view of the speaker unit concerning a 1st embodiment.
It is a typical longitudinal section showing a speaker unit concerning a 1st embodiment.
It is a block diagram showing an acoustic device using a line array speaker. It is a schematic rear
view which shows the line array speaker which concerns on 2nd Embodiment. It is a block
diagram showing an acoustic device using a line array speaker. It is a typical rear view showing
the line array speaker concerning a 3rd embodiment. It is a schematic diagram which shows the
conventional line array speaker.
[0019]
First Embodiment FIG. 1 is a schematic view showing a line array speaker according to a first
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embodiment. In FIG. 1, reference numerals 1, 1, 1... Are cone-type speaker units, which are
attached so as to be juxtaposed in the longitudinal direction of the rectangular baffle plate 2. As
shown in FIG. The baffle plate 2 is a front surface of a rectangular parallelepiped housing 3 that
accommodates the speaker units 1, 1, 1. The housing 3 is installed such that the longitudinal
direction of the baffle plate 2 is horizontal.
[0020]
2 and 3 are a schematic top view and a back view of the speaker unit 1 according to the first
embodiment, and FIG. 4 is a schematic longitudinal sectional view showing the speaker unit 1
according to the first embodiment. is there. In the figure, 10 is a frame made of a steel plate and
has a substantially frusto-conical cylindrical shape. On the side surface of the frame 10,
trapezoidal openings 10a and 10a are provided at two positions on the upper and lower sides of
the speaker unit 1 so as to extend in the circumferential direction of 90 degrees. On the other
hand, the opening 10a is not provided on the side surface on the side in the parallel arrangement
direction.
[0021]
An inner edge of an edge 11 a made of a foamed rubber is adhered to a ring-shaped outer
surface of the large diameter side of the diaphragm 11 made of a cone-shaped pulp. The outer
edge of the edge 11 a is fixed along the large diameter inner side surface of the frame 10. Thus,
the frame 10 vibratably supports the diaphragm 11 via the edge 11 a.
[0022]
Here, for each speaker unit 1, a plane including the central axis passing through the small
diameter center and the large diameter center of the diaphragm 11 and including a plane
perpendicular to the parallel direction and a central axis perpendicular to the plane is
respectively Assume two planes rotated 45 degrees around the central axis. Of the side surfaces
of the frame 10 belonging to a total of four regions partitioned by such two surfaces, the two
sides including the vertical direction are the upper and lower sides, and the two sides including
the parallel direction sides are the parallel arrangement side.
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[0023]
On the small diameter side of the frame 10, the front surface of an annular, soft iron top plate 12
is fixed. The front surface of the annular magnet 17 is fixed to the rear surface of the top plate
12. A voice coil 13 in which a copper wire is wound around a cylindrical bobbin is fitted so as to
be concentric and movable on the top plate 12 and the magnet 17. The yoke 14 comprises a disc
portion and a cylindrical portion extending from the center of one surface of the disc portion.
The cylindrical portion of the yoke 14 is internally fitted to the voice coil 13. On the other hand,
the rear surface of the magnet 17 is fixed to one surface of the disk portion of the yoke 14.
[0024]
The side surface on the front end side of the voice coil 13 is adhered to the inner surface of the
diaphragm 11 on the small diameter side, and the voice coil 13 and the diaphragm 11 form a
funnel shape. The small diameter of the diaphragm 11 is closed by a thin dust cap 15. The inner
edge of the annular corrugation damper 16 is bonded to the side surface on the front end side of
the voice coil 13, and the outer edge is bonded to the inner surface on the smaller diameter side
in the frame 10.
[0025]
Furthermore, two holes 10b, 10b aligned in the circumferential direction are provided on one
side of the parallel installation direction of the frame 10, and the terminals 18 and 19 are
attached to the two holes 10b, 10b respectively. ing. The terminal 18 is connected to the copper
wire forming the voice coil 13 via a flexible wire. Also, the terminals 18 are insulated from the
frame 10. The terminal 19 is a ground side terminal and is in contact with the frame 10.
[0026]
FIG. 5 is a block diagram showing an acoustic device using a line array speaker. In the sound
device according to the present embodiment, sound signals are input from the external sound
source 4 to the delay modules 5, 5,. The delay time and the amplification factor based on the
virtual sound source position are individually set for each of the corresponding speaker units 1,
1, 1 to the delay modules 5, 5, 5. Delay by the delay time. The delayed acoustic signals are
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amplified by the same number of amplifiers 6, 6, 6 ... as the delay modules 5, 5, 5 ... respectively,
and then to the terminals 18, 18, 18 ... in the same number of speaker units 1, 1, 1 ... It is output.
The acoustic signal is input to generate an electromagnetic force in the voice coil 13. The
vibrating plate 11 vibrates and emits noise due to the force generated by the electromagnetic
force and the magnetic force generated by the magnet 17. On the other hand, when the
diaphragm 11 vibrates, a back pressure is generated in the direction perpendicular to the
diaphragm 11. The back pressure is released from the frame 10 by the openings 10 a, 10 a, and
the sidewise component of the back pressure parallel direction is blocked by the side surface of
the frame 10.
[0027]
According to the present embodiment, the interference of the back pressure can be reduced by
not providing the opening on the side surface of the frame 10 of the speaker unit 1 on the side in
the parallel direction. Moreover, since the frame 10 in the present embodiment has no opening
on the side surface in the parallel direction, the strength of the frame 10 is increased.
Accordingly, the deflection generated in the frame 10 during the sound emission is reduced, so
the vibration of the baffle plate 2 is also reduced. This can suppress the deterioration of the
sound quality.
[0028]
Furthermore, according to the present embodiment, by providing the holes 10b and 10b in the
frame 10 and providing the terminals 18 and 19 of the electrodes in the holes 10b and 10b,
there is no need to provide a terminal plate for blocking the opening 10a. Furthermore, the side
surface in the parallel installation direction in the frame 10 has a larger area than the upper and
lower sides. Therefore, by providing the holes 10 b and 10 b on the side surface of the frame 10
on the side along the installation direction, the side surface on the side along the installation
direction can be effectively used.
[0029]
The material of the frame 10 may be a steel plate or a metal such as an aluminum alloy, or may
be a resin material such as an ABS resin, a polypropylene resin, or a polycarbonate resin. The
diaphragm 11 may be made of resin or metal, and the edge 11a may be made of urethane or
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cloth. The voice coil 13 may be a material other than copper, such as aluminum. There is no
limitation in particular about the structure of the magnetic circuit part which consists of the
voice coil 13, the yoke 14, the magnet 17, and the top plate 12, You may be another structure.
[0030]
The openings 10a and 10a on the upper and lower sides may have a circumferential width of 90
degrees or less. There is no limitation on the number and shape of the openings 10a. The shape
of the diaphragm 11 may be a conical elliptical cone shape. The shape of the frame 10 may be a
substantially elliptic cone shape or a substantially polygonal pyramid cylindrical shape.
[0031]
Second Embodiment A second embodiment will be described. FIG. 6 is a schematic rear view
showing the line array speaker according to the second embodiment. In the line array speaker
according to the present embodiment, in addition to the openings 10a and 10a on the upper and
lower sides of the speaker unit 1, the opening 10a is provided only on one side in the parallel
direction.
[0032]
In order to properly emit sound from the individual speaker units 1, it is desirable that the total
area of the openings 10a be large so that the back pressure can be released without resistance.
Further, if there is no opening on the side of the direction parallel to the frame 10 of one of the
two speaker units 1 1 adjacent to each other, interference of the back pressure can be reduced.
In the present embodiment, in addition to the openings 10a and 10a on the upper and lower
sides, the opening 10a is provided on one side of the frame 10 in the parallel direction, and the
other side has no opening.
[0033]
However, in this case, since the shape of the frame 10 is asymmetrical, the deflection of the
diaphragm 11 at the time of sound emission is not constant, and the sound emission is disturbed.
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The disturbance of this sound emission is mainly due to the high-tone component. FIG. 7 is a
block diagram showing an audio apparatus using a line array speaker. In this case, LPFs (Low
Pass Filter) 7, 7, 7... Are provided between the amplifiers 6, 6, 6... Of the acoustic device and the
speaker units 1, 1, 1. Therefore, the high-pitched part may not be emitted.
[0034]
According to the present embodiment, in addition to the openings 10a and 10a on the upper and
lower sides of the frame 10, the interference of the back pressure can be reduced by providing
the openings 10a only on one side in the parallel direction. In addition, the air resistance of the
diaphragm 11 can be reduced by releasing the back pressure also from the side in the parallel
arrangement direction, and sound emission by the diaphragm 11 can be favorably performed.
[0035]
Third Embodiment A third embodiment will be described. FIG. 8 is a schematic rear view showing
a line array speaker according to a third embodiment. In the third embodiment, in addition to the
openings 10a and 10a on the upper and lower sides of the frame 10 in the speaker unit 1, the
openings 10a and 10a are provided on the side in the parallel direction. The openings 10a, 10a
on the side along the parallel direction have a circumferential width of 20 degrees.
[0036]
According to the present embodiment, the openings 10a and 10a on the side along the
arrangement direction are smaller in area than the openings 10a and 10a on the upper and
lower sides. Therefore, the frame 10 can reduce the interference of the back pressure in the
direction of parallel arrangement between the adjacent speaker units 1 and 1. In addition, since
the back pressure is released from the side of the frame 10 in parallel direction by the openings
10a and 10a and the air resistance of the diaphragm 11 is reduced, sound emission by the
diaphragm 11 can be favorably performed. There is no limitation on the number and shape of
the upper and lower openings 10a.
[0037]
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It should be understood that the embodiments disclosed herein are illustrative in all respects and
not restrictive. The scope of the present invention is indicated not by the meaning described
above but by the claims, and is intended to include all the modifications within the meaning and
scope equivalent to the claims. For example, the array speaker according to the present
embodiment may be used to generate an acoustic beam that emits sound in a specific direction
with strong directivity as well as WFS, or may be used for wavefront synthesis other than WFS.
Further, the housing 3 may be installed such that the longitudinal direction of the baffle plate 2
is the vertical direction.
[0038]
Reference Signs List 1 speaker unit 2 baffle plate 3 housing 4 sound source 5 delay module 6
amplifier 7 LPF 10 frame 10a opening 10b hole 11 diaphragm 11a edge 12 top plate 13 voice
coil 14 yoke 15 dust cap 16 corrugation damper 17 magnet 18 terminal 19 terminal
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