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DESCRIPTION JP2016082568

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DESCRIPTION JP2016082568
Abstract: The present invention provides an acoustic system that can be installed on the upper
part of a listener who is not easily disturbed without damaging the inside of a room. An acoustic
system includes a planar speaker (210) outputting directional sound waves, a frame (220)
supporting the speaker (210), and a support fixed movably in a space having a floor (110) and
supporting the frame (220). And a unit 230. The support 230 supports the frame 220 such that
the speaker 210 outputs an acoustic wave towards the floor 110. [Selected figure] Figure 1
Sound system
[0001]
The present invention relates to acoustic systems. In particular, the present invention relates to a
movably installed acoustic system.
[0002]
Conventionally, headphones are used in the case of a silent instrument where only the performer
(listener) listens to the playing sound, such as an electric violin, electric guitar, or electronic
piano that can not mute the resonance piano that resonates with vibrations generated by the
strings. I had to wear and play. However, when the headphones are worn for a long time, the
listener may feel uncomfortable because the headphones compress the ear or the head, and
sometimes the listener may feel pain. In addition, when listening to the performance sound
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through the headphones, since the sound is transmitted directly from the ear or head, it sounds
different from the sound transmitted through the space and being heard like an actual
performance sound.
[0003]
As described above, an acoustic system has been developed in which only the listener can listen
to the performance sound without wearing the headphones. For example, Patent Document 1
discloses an acoustic system in which a performance sound is transmitted only to the listener by
installing a flat speaker having directivity going straight on in the side direction of the listener.
[0004]
JP, 2011-215187, A
[0005]
However, in the sound system described in Patent Document 1, since the speaker is fixed to the
wall, the listener can only listen in a limited area of the room in which the sound system is
installed.
Therefore, it was necessary to decide the place to play in accordance with the audible area. In
addition, when moving the place to play in the room or playing in another room, the installation
jig for the sound system needs to be installed in the room, and the inside of the room will be
scratched. There was a problem that.
[0006]
The present invention has been made in view of such problems, and it is an object of the present
invention to provide an acoustic system that can be installed on the upper part of a listener who
does not easily get in the way without damaging the inside of a room.
[0007]
According to an embodiment of the present invention, there is provided an acoustic system
including: a planar speaker outputting directional sound waves; a frame supporting the speaker;
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and a support portion movably fixed in a space having a floor and supporting the frame And the
support portion supports the frame such that the speaker outputs sound waves toward the floor.
[0008]
According to the sound system of the present invention, the sound system can be installed on the
upper part of the listener who is not easily disturbed without damaging the inside of the room.
[0009]
BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the whole
structure of the sound system which concerns on Embodiment 1 of this invention.
It is sectional drawing which looked at the acoustic system which concerns on Embodiment 1 of
this invention from the direction of A of FIG.
It is the side view which looked at the acoustic system which concerns on Embodiment 1 of this
invention from the direction of B of FIG.
It is a functional block diagram showing a function of an acoustic system concerning
Embodiment 1 of the present invention. It is sectional drawing of the acoustic system concerning
the modification of Embodiment 1 of this invention. It is sectional drawing of the acoustic system
which concerns on Embodiment 2 of this invention. It is sectional drawing of the acoustic system
concerning the modification of Embodiment 2 of this invention. It is sectional drawing of the
acoustic system which concerns on Embodiment 3 of this invention. It is sectional drawing of the
acoustic system which concerns on Embodiment 4 of this invention. It is sectional drawing of the
acoustic system which concerns on Embodiment 5 of this invention. It is sectional drawing of the
acoustic system concerning the modification of Embodiment 5 of this invention. It is sectional
drawing of the acoustic system which concerns on Embodiment 6 of this invention. It is a
perspective view which shows the structure of the speaker in the sound system which concerns
on Embodiment 6 of this invention. It is sectional drawing of the sound system which concerns
on the modification of Embodiment 6 of this invention. It is a perspective view which shows the
structure of the speaker in the sound system which concerns on the modification of Embodiment
6 of this invention. It is sectional drawing of the sound system which concerns on the
modification of Embodiment 6 of this invention. It is a perspective view which shows the
structure of the speaker in the sound system which concerns on the modification of Embodiment
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6 of this invention. It is a figure which shows the outline | summary of the evaluation sample
shape of the Example of this invention. It is a figure explaining the evaluation method of the
example of the present invention. It is a figure which shows the evaluation result of the Example
of this invention. It is a figure which shows the evaluation result of the Example of this invention.
It is a figure which shows the simulation result of the Example of this invention. It is a figure
which shows the simulation result of the Example of this invention.
[0010]
Hereinafter, an acoustic system according to the present invention will be described with
reference to the drawings. However, the acoustic system of the present invention can be
implemented in many different modes, and is not construed as being limited to the description of
the embodiments shown below. Note that in the drawings referred to in this embodiment, the
same portions or portions having similar functions are denoted by the same reference numerals,
and the description thereof will not be repeated.
[0011]
<First Embodiment> An outline of a sound system according to a first embodiment of the present
invention will be described with reference to FIGS. In FIG. 1 to FIG. 4, a planar planar speaker (a
flat surface speaker (plane) which is disposed above a player (listener) who plays a muffling
instrument such as an electric violin and has directivity to go straight toward the listener A sound
system having a speaker) will be described.
[0012]
[Configuration of Sound System 10] FIG. 1 is a perspective view showing the entire configuration
of a sound system according to Embodiment 1 of the present invention. In FIG. 1, an acoustic
system 10 according to Embodiment 1 of the present invention is installed in a room 100
provided with a floor 110 and a ceiling 120. Here, although the room 100 shown in FIG. 1 is
surrounded by walls 130 in all directions, the acoustic system 10 can be used in a room where
the wall 130 is not provided. Further, as shown in FIG. 1, the acoustic system 10 is movably fixed
inside the room 100 by a flat speaker 210 outputting a sound wave 213 having directivity, a
frame 220 supporting the flat speaker 210, and a frame And a support portion 230 for
supporting the support 220. Here, the support 230 supports the frame 220 such that the flat
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speaker 210 outputs the sound wave 213 toward the floor 110. In FIG. 1, the support portion
230 is connected to the first support member 231 supporting the frame 220 and the first
support member 231, installed between the floor 110 and the ceiling 120, and fixing the
acoustic system 10. And a support member 232. In addition, the second support member 232
includes an upper pad 233 disposed at the upper end and a lower pad 234 disposed at the lower
end. Although the second support member 232 is installed between the floor 110 and the ceiling
120 in FIG. 1, the second support member 232 may be installed between the opposing walls 130.
That is, pads provided at both ends of the second support member 232 may be fixed to the
respective surfaces of the opposing walls 130. Here, the flat speaker 210 is installed above the
listener's head. In other words, the planar speaker 210 is disposed such that the listener is
positioned in the direction normal to the plane of the planar speaker 210. Further, the support
portion 230 is provided with a signal receiving device 240 including an amplifier. Here, although
the signal receiving device 240 exemplifies the configuration installed on the second support
member 232, the present invention is not limited to this configuration. For example, even if the
signal receiving device 240 is installed on the first support member 231 Good. Detailed
structures and functions of these members will be described later.
[0013]
Further, in FIG. 1, an example in which a player (listener) 300 plays the electric violin 310 will be
described. The electric violin is an electric musical instrument that uses an electronic circuit in
the sound unit, and is not provided with a resonance cylinder that resonates with the vibration
generated by rubbing a string with a bow. Instead of not resonating, the electric violin is
equipped with a signal transmitter 320 which includes a pick-up which detects vibrations and
converts them into electrical signals. Although FIG. 1 illustrates the acoustic system according to
the present invention by exemplifying an electric violin, it can be applied to other silent
instruments such as an electric guitar and an electronic piano. The acoustic system according to
the present invention can also be applied to a device that outputs sound as an electrical signal.
[0014]
The detailed structure and function of each member included in the acoustic system 10 will be
described with reference to FIG. FIG. 2 is a cross-sectional view of the acoustic system according
to the first embodiment of the present invention as viewed from the direction of A in FIG. As
shown in FIG. 2, the flat speaker 210 is disposed on one side of the vibrating portion 211
generating the sound wave and one side of the vibrating portion 211, and blocks the sound wave
output from the one side of the vibrating portion 211. And a sound insulation unit 212. Here, the
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vibrating portion 211 is an electrostatic type speaker, and has a structure in which a sheet-like
vibrating film is sandwiched between a pair of planar electrodes. A conductive film such as
aluminum is used for the vibrating film of the vibrating section 211, and the vibrating film is
operated by electrostatic force generated by applying a voltage to one of the pair of planar
electrodes. An AC voltage of a fixed frequency is applied to the pair of planar electrodes, and the
vibrating membrane vibrates at the frequency to output a sound wave. In such a vibration unit
211, the sound wave to be output becomes a planar wave front. Therefore, the sound wave 213
output from the vibration unit 211 has strong directivity in the normal direction 214 of the
surface of the vibration film. The frequency band of the sound wave output from the vibration
unit 211 is determined according to the size and the shape of the above-described vibration film.
For example, in order to output the lowest sound (196 Hz) in the tone range of a violin, the size
of the vibrating portion 211 is required to be at least B2 size (515 × 728 mm), preferably A0
size (841 × 1189 mm) It is good that it is above. Here, in the vibrating portion 211, an
insulating layer may be provided between the vibrating membrane and the pair of planar
electrodes.
[0015]
The frame 220 supports the vibration unit 211 and the sound insulation unit 212 by supporting
the vibration unit 211 and the outer peripheral end of the sound insulation unit 212. The frame
220 may be supported so as to cover all the outer peripheral end portions of the vibrating
portion 211 and the sound insulating portion 212, or only a part of the outer peripheral end
portions of the vibrating portion 211 and the sound insulating portion 212 may be supported. .
In the frame 220, an opening 221 is provided on the side opposite to the side on which the
sound insulation portion 212 of the vibrating portion 211 is disposed. The sound wave 213
generated by the vibration unit 211 is output to the outside of the frame 220 through the
opening 221. In FIG. 2, the frame member is not provided at the center of the frame 220, but the
frame member is provided at a part of the opening 221 of the flat speaker 210 for the purpose of
improving the frame strength and supporting power of the flat speaker 210. It may be provided.
For example, a frame member may be provided in the form of a lattice or a honeycomb at the
opening 221 of the frame 220 in FIG. Of course, the shape of the frame member provided in the
opening 221 of the frame 220 is not limited to these shapes, and may be other various shapes.
[0016]
Here, part or all of the flat speaker 210 and the frame 220 may have translucency. For example,
a conductive resin or the like can be used as the vibrating portion 211 of the flat speaker 210.
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Furthermore, as the frame 220, a highly translucent resin material such as acrylic can be used. In
addition, a hole or a notch that transmits light may be provided in the flat speaker 210 and a part
of the frame 220. With the above-described configuration, it is possible to suppress that the light
of the illumination installed on the ceiling is blocked by the acoustic system. As another
configuration, a light source such as an LED or an organic EL may be disposed below the frame
220. With such a configuration, it is possible to compensate for the light of the illumination
blocked by the acoustic system and to provide more light to the listener.
[0017]
The first support member 231 of the support portion 230 includes a connection portion 236
connected rotatably and movably to the frame 220 and a connection portion 235 connected
rotatably and movably to the second support member 232. The second support member 232 of
the support portion 230 extends and contracts in the longitudinal direction of the second
support member 232, and is fixed to the room 100 by pressing the floor 110 and the ceiling
120. In other words, the support portion 230 is fixed inside the chamber 100 by partially
expanding and contracting. Also, in other words, the support portion 230 has the upper pad 233
(first fixing portion) and the lower pad 234 (second fixing portion), and the distance between the
upper pad 233 and the lower pad 234 is variable. 233 is fixed to the ceiling 120 (first surface),
and the lower pad 234 is fixed to the floor 110 (second surface). The structure for varying the
distance between the first fixing portion and the second fixing portion can be realized with
various structures. For example, a telescopic pipe structure such as an antenna or a baton, an
axial structure having a telescopic function by a rod-like member, an outer shell structure having
a telescopic function with a monocoque shell structure, or the like may be used. Although FIG. 2
illustrates the configuration in which the upper pad 233 contacts the ceiling 120 and the lower
pad 234 contacts the floor 110, between the upper pad 233 and the ceiling 120 or between the
lower pad 234 and the floor 110. Other structures may be held between them.
[0018]
Moreover, in FIG. 2, the state which the 1st support member 231 rotationally moved centering
on the connection part 235 is shown with a dashed-two dotted line. The rotationally movable
area of the first support member 231 includes a range in which the plane of the flat speaker 210
and the plane of the floor 110 are parallel. In other words, the support portion 230 movably
supports the frame 220 in a predetermined range including a range in which the plane of the flat
speaker 210 and the plane of the floor 110 are parallel. Moreover, it is also possible to make the
1st support member 231 and the 2nd support member 232 parallel when accommodating. In
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addition, in the first support member 231, the connection portion 235 may slide in the
longitudinal direction of the second support member 232. Further, the distance between the
connection portion 235 and the frame 220 may be variable. Further, the first support member
231 and the frame 220 may be rotationally moved about the second support member 232.
However, the first support member 231 need not necessarily be rotationally moved, and may be
fixed to the second support member 232, for example. Moreover, although the 1st support
member 231 and the 2nd support member 232 illustrated the structure which is a separate
member in FIG. 2, it is not limited to this structure, For example, the 1st support member 231
and the 2nd support member 232 are integrated. It may be formed of Here, the flat speaker 210
may be disposed parallel to the floor 110 or may be disposed at an incline. At this time, the
listener may be disposed so as to be located in the normal direction 214 of the surface of the flat
speaker 210.
[0019]
Although FIG. 2 illustrates the structure in which the sound insulation unit 212 is disposed above
the vibration unit 211, the present invention is not limited to this structure. For example, the
frame 220 arranged above the vibration unit 211 has a sound insulation function. In the case
where the ceiling 120 has a sound insulation function, the sound insulation unit 212 may not be
provided if there is no problem in use even if a sound wave is output upward.
[0020]
FIG. 3 is a side view of the acoustic system according to the first embodiment of the present
invention as viewed from the direction of B in FIG.
As shown in FIG. 3, the frame 220 is supported by the first support member 231 so as to be
rotatable about the connection portion 236. In FIG. 3, a state in which the frame 220 is
rotationally moved about the connection portion 236 is indicated by a two-dot chain line. Here,
the rotationally movable area of the flat speaker 210 and the frame 220 includes a range in
which the plane of the flat speaker 210 and the plane of the floor 110 are parallel. In other
words, the support portion 230 movably supports the frame 220 in a predetermined range
including a range in which the plane of the flat speaker 210 and the plane of the floor 110 are
parallel. Moreover, it is also possible to make the 1st support member 231 and the 2nd support
member 232 parallel when accommodating. However, the flat speaker 210 and the frame 220 do
not necessarily have to be rotationally moved, and may be fixed to the first support member 231,
for example. Here, the planar speaker 210 may be disposed parallel to the floor 110 or may be
disposed so as to be inclined such that the listener is located in the normal direction 214 of the
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surface of the planar speaker 210.
[0021]
The functions of the signal receiving apparatus 240 and the signal transmitting apparatus 320
will be described in detail with reference to FIG. FIG. 4 is a functional block diagram showing
functions of the audio system according to the first embodiment of the present invention. In FIG.
4, the functional block diagram of each of the signal receiver 240 and the signal transmitter 320
is shown. As shown in FIG. 4, the signal receiving apparatus 240 includes an amplifier circuit
241 connected to the flat speaker 210, a D / A converter 242, and a communication unit 243.
The signal transmission device 320 further includes a pickup 321, an amplifier circuit 322, an A
/ D converter 323, and a communication unit 324. Although FIG. 1 and FIG. 4 illustrate the
configuration in which the communication units 243 and 324 wirelessly communicate with each
other, the communication units 243 and 324 may be connected to each other by wires to
perform wired communication. Further, FIG. 4 exemplifies a configuration in which digital
communication is performed by converting the played sound into digital, but the present
invention is not limited to this configuration. For example, analog communication is performed as
an analog signal without converting the played sound into digital. It may be a configuration to be
performed. When performing analog communication, the signal transmission device 320 may
have a carrier wave oscillation circuit or a modulation circuit instead of the A / D converter 323.
In addition, when performing analog communication, the signal receiving apparatus 240 may
have a tuning circuit or a demodulation circuit instead of the D / A converter 242. Also, analog
communication may be performed by frequency modulation (FM) or may be performed by
amplitude modulation (AM).
[0022]
Next, operations of the signal receiving apparatus 240 and the signal transmitting apparatus 320
will be described using FIG. 4. First, the sound played by the musical instrument is collected by
the pickup 321 and converted into an electric signal. The electric signal obtained by the
conversion is amplified in amplitude by the amplifier circuit 322 and converted into a digital
signal by the A / D converter 323. Then, the converted digital signal is transmitted from the
communication unit 324 to the communication unit 243 by wireless communication. Next, the
digital signal received by the communication unit 243 is converted by the D / A converter 242
into an analog signal. After being converted into an analog signal, the amplitude is amplified by
the amplifier circuit 241 and output from the flat speaker 210.
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[0023]
Here, in the first embodiment, the configuration in which the pickup is used as a member for
picking up the sound of the musical instrument has been illustrated, but the present invention is
not limited to this configuration. For example, in the case of using a normal musical instrument
from which sound is output by playing, a microphone may be used instead of the pickup. The
microphone may be, for example, a stand-type microphone that can be installed in front of a
listener, or a pin microphone that can be attached to an instrument. When these microphones are
used, a circuit for suppressing howling may be further provided in the signal reception device
240.
[0024]
As described above, according to the sound system according to the first embodiment of the
present invention, the sound system can be installed on the upper part of the listener who does
not easily get in the way without damaging the inside of the room. By installing an acoustic
system on top of the listener, more natural instrumental sound can be provided. For example, in
the case of a violin, by emitting sound from above the listener's head, it is possible to provide the
listener with a sense of near localization when playing an acoustic violin. In addition, since the
speaker does not easily enter the field of view, the listener can be provided with an open feeling.
In addition, since the flat speaker according to the present invention is lighter than a
conventional cone-type speaker, the flat speaker can be disposed above the listener by using a
lightweight and simple supporting portion. In addition, since the sound insulation unit 212 is
disposed on the ceiling 120 side of the flat speaker 210, the sound wave output from the
vibrating unit 211 to the direction of the ceiling 120 can be blocked, so the influence of the
reflection by the ceiling 120 is reduced. Can provide the listener with a more natural playing
sound. In addition, since the orientation of the planar speaker 210 is variable, the orientation of
the planar speaker 210 can be finely adjusted to be suitable for the listener without removing the
sound system, and can be compactly stored when not in use. . Further, by arranging the signal
receiving device 240 separately from the flat speaker 210 and arranging the signal receiving
device 240 near the floor 110 of the support portion 230, the weight of the member arranged
above the listener can be further reduced.
[0025]
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Modification of Embodiment 1 FIG. 5 is a cross-sectional view of an acoustic system according to
a modification of Embodiment 1 of the present invention. As shown in FIG. 5, even if the support
portion 230 of the acoustic system 11 according to the modification of the first embodiment is a
place other than the floor 110, it can be fixed to a plane parallel to the surface of the ceiling 120.
In FIG. 5, the lower pad 234 can also be disposed on a foundation 250 disposed on the floor 110.
Here, the base 250 may be a table, a chair, and a shelf as long as it can be stably disposed on the
floor 110. The upper surface of the base 250 (the surface facing the ceiling 120) is preferably
substantially parallel to the ceiling 120, but may not be parallel as long as the support 230 can
be fixed. Further, by making the upper pad 233 and the lower pad 234 movable, even if the
upper surface of the base 250 is not parallel to the ceiling 120, it can be attached. Further,
although FIG. 5 illustrates the configuration in which the base 250 is disposed as a structure
between the floor 110 and the lower pad 234, a structure may be disposed between the ceiling
120 and the upper pad 233. Also, structures may be disposed both between the floor 110 and
the lower pad 234 and between the ceiling 120 and the upper pad 233.
[0026]
Second Embodiment The outline of a sound system according to a second embodiment of the
present invention will be described with reference to FIGS. 6 and 7. Embodiment 2 describes an
acoustic system in which an acoustic system is attached to a hook rosette or a hook ceiling to
which a light or the like can be attached.
[0027]
[Configuration of Sound System 20] FIG. 6 is a cross-sectional view of a sound system according
to Embodiment 2 of the present invention. In the acoustic system 20 shown in FIG. 6, since the
flat speaker 210 and the frame 220 can be the same as those of the acoustic system 10 shown in
FIG. 2, the detailed description is omitted here. In FIG. 6, the ceiling 120 is provided with a
hooked ceiling 260 that enables attachment of illumination and the like and electrode supply. A
support 270 supporting the frame 220 is removably attached to the hook ceiling 260. Here, the
flat speaker 210 outputs an acoustic wave by the power supplied from the hook ceiling 260.
More specifically, the signal receiving device 240 is fixed to the support portion 270, and the
signal receiving device 240 is operated by the power supplied from the hook ceiling 260 so that
the sound wave is output from the flat speaker 210. That is, the support portion 270 has a metal
terminal (blade), and the blade is inserted into the hole (blade holder) of the hooking ceiling 260
and twisted in one direction to fit the blade and the blade holder, The hook ceiling 260 and the
support portion 270 are physically and electrically connected. Here, although the configuration
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for attaching the sound system 20 to the hook ceiling 260 is illustrated in FIG. 6, the sound
system 20 may be attached to the hook rosette. Further, in order to change the orientations of
the flat speaker 210 and the frame 220, the support portion 270 may have a movable portion.
[0028]
As described above, according to the sound system according to the second embodiment of the
present invention, a listener who is not easily disturbed by damaging the inside of the room by
attaching the sound system using the equipment provided in the room in advance. An acoustic
system can be installed on top of the By installing an acoustic system on top of the listener, more
natural instrumental sound can be provided. In addition, since the flat speaker 210 is attached to
be able to supply an electrode from the hooking ceiling 260, there is no need to prepare a
separate power supply. In other words, attachment of the sound system and power supply can be
performed simultaneously.
[0029]
Modification of Embodiment 2 FIG. 7 is a cross-sectional view of an acoustic system according to
a modification of Embodiment 2 of the present invention. The acoustic system 21 shown in FIG. 7
is similar to the acoustic system 20 shown in FIG. 6, but the acoustic system 21 has a duct rail
280 and a plurality of connectors 281 between the support 270 and the hooking ceiling 260.
The acoustic system 20 differs from the acoustic system 20 in that the support portion 270, the
frame 220, and the flat speaker 210 are connected to each of the plurality of connectors 281.
[0030]
In the acoustic system 21 shown in FIG. 7, since the flat speaker 210, the frame 220, and the
signal receiving device 240 can be the same as those of the acoustic system 10 shown in FIG. 2,
detailed description will be omitted here. In FIG. 7, the duct rail 280 has a metal terminal (blade),
and the blade is inserted into the hole (blade holder) of the hooking ceiling 260 and twisted in
one direction to fit the blade and the blade holder. Thus, the hooking ceiling 260 and the duct
rail 280 are physically and electrically connected. Further, the plurality of connectors 281 are
slidably connected to the duct rail 280, and the terminals provided on the respective connectors
281 are supplied with electric power from the hooking and sealing 260. Further, a support
portion 270 for supporting the frame 220 is detachably attached to the connector 281. In
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addition, the support portion 270 is attached to the terminal portion of the connector 281 and
has a connection portion capable of supplying an electrode. That is, by attaching the connection
portion of the support portion 270 to the terminal portion of the connector 281, the support
portion 270 and the connector 281 are physically and electrically connected. Here, although FIG.
7 illustrates the configuration for attaching the sound system 21 to the hook ceiling 260, the
sound system 20 may be attached to the hook rosette.
[0031]
Although FIG. 7 exemplifies a configuration in which different support portions 270 are attached
to a plurality of connectors 281, the present invention is not limited to this configuration, for
example, a configuration in which one support portion is attached to a plurality of connectors
281 Alternatively, one frame may be supported by a plurality of supports 270. In this way, one
support is attached to the plurality of connectors 281, or one frame is supported by the plurality
of supports, so that even one large support or frame can be stabilized. Can be fixed.
[0032]
Third Embodiment The outline of a sound system according to a third embodiment of the present
invention will be described with reference to FIG. In the third embodiment, an acoustic system is
provided above the listener with two planar speakers that output sound waves having directivity
going straight toward the listener, and a stereo speaker that outputs different sounds from the
respective speakers. Will be explained.
[0033]
[Configuration of Sound System 30] FIG. 8 is a cross-sectional view of a sound system according
to Embodiment 3 of the present invention. The acoustic system 30 shown in FIG. 8 is similar to
the acoustic system 10 shown in FIG. 3, but differs from the acoustic system 10 in that the
acoustic system 30 includes flat speakers 210A and 210B. As shown in FIG. 8, the flat speaker
210A of the sound system 30 outputs the first sound to one side (for example, the right ear) of
the listener, and the flat speaker 210B is connected to the other side (for example, the left ear) of
the listener. It is arranged to output 2 sounds. That is, in the support unit 230, the frame 220 is
such that the flat speaker 210A outputs the first sound toward one side of the listener and the
flat speaker 210B outputs the second sound toward the other side of the listener. Support.
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Further, as shown in FIG. 8, the flat speaker 210A and the frame 220A are supported by the first
support member 231A so as to be rotationally movable around the connecting portion 236A, and
the flat speaker 210B and the frame 220B are around the connecting portion 236B. It is
rotatably supported by the first support member 231B. The rotationally movable area of the flat
speakers 210A and 210B includes a range in which each surface is parallel to the surface of the
floor 110, and parallel to the first support members 231A and 231B and the second support
member 232 when stored. You can also. Here, the flat speaker 210A is disposed such that the
normal direction of the face of the flat speaker 210A is located on one side of the listener, and
the flat speaker 210B is normal to the face of the flat speaker 210B on the other side of the
listener The directions may be arranged to be located.
[0034]
The flat speaker 210A and the flat speaker 210B may divide the sound of the musical instrument
played by the listener into left and right and output. Further, the flat speaker 210A may output
the sound of the instrument played by the listener, and the flat speaker 210B may output a
sound different from the instrument played by the listener. For example, a performance song or
the performance of another player may be output from the flat speaker 210B. Note that the
performance of the listener, the performance of another performer, the performance music, and
the like may be distinguished from each other and may be output from both the flat speaker
210A and the flat speaker 210B. Moreover, although the sound system in which two flat
speakers were installed was illustrated in FIG. 8, three or more speakers may be installed. For
example, the plurality of speakers may be disposed in the left-right direction on the paper surface
of FIG. 8 or may be disposed in the front-rear direction of FIG.
[0035]
As described above, according to the sound system of the third embodiment of the present
invention, the sound system can be installed on the upper part of the listener who does not easily
get in the way without damaging the inside of the room. By installing an acoustic system on top
of the listener, more natural instrumental sound can be provided. In addition, since different
sounds are output from each of the flat speaker 210A and the flat speaker 210B, various sounds
can be provided to the listener.
[0036]
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Fourth Embodiment The outline of a sound system according to a fourth embodiment of the
present invention will be described with reference to FIG. In the fourth embodiment, an acoustic
system will be described in which a curved planar speaker (curved surface speaker) is installed
and the sound output from the curved loudspeaker is concentrated on the listener.
[0037]
[Configuration of Sound System 40] FIG. 9 is a cross-sectional view of a sound system according
to Embodiment 4 of the present invention. The acoustic system 40 shown in FIG. 9 is similar to
the acoustic system 10 shown in FIG. 3, but differs from the acoustic system 10 in that the
acoustic system 40 has a curved speaker 400 and a frame 410. As shown in FIG. 9, the frame
410 is provided with an opening 411, and the surface provided with the opening 411 is curved
so as to be concave. That is, in FIG. 9, the curved surface of the curved speaker 400 has a
concave shape in the direction of the floor 110. The sound waves output from the curved
speaker 400 to the outside of the frame 410 through the opening 411 gradually move while
being concentrated, so a sound wave having a higher density than the output surface of the
curved speaker 400 is formed. That is, the density of the sound wave is higher in the vicinity of
the listener than in the vicinity of the output surface of the curved speaker 400, and the sound
becomes larger.
[0038]
In FIG. 9, the curved surface speaker 400 and the frame 410 illustrate the configuration in which
the surface side provided with the opening 411 has a concave shape, but is not limited to this
configuration, for example, the surface provided with the opening 411 has a convex shape You
may have. Since the surface provided with the opening 411 has a convex shape, the sound wave
output from the speaker travels while being spread, so that a plurality of listeners can listen.
[0039]
As described above, according to the sound system of the fourth embodiment of the present
invention, the sound system can be installed on the upper part of the listener who does not easily
get in the way without damaging the inside of the room. By installing an acoustic system on top
of the listener, more natural instrumental sound can be provided. In addition, since the curved
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surface speaker 400 has a convex shape in the ceiling direction, the sound wave can be
concentrated on the listener, and the sound output from the curved surface speaker 400 is
sufficiently large for the listener even if the sound is small. Sound can be provided. Furthermore,
since the sound waves reflected by the floor 110 gradually spread and the density of the sound
waves decreases, it is possible to make the sound leaking to the outside smaller than the sound
transmitted to the listener.
[0040]
Fifth Embodiment The outline of a sound system according to a fifth embodiment of the present
invention will be described with reference to FIGS. 10 and 11. FIG. In the fifth embodiment, an
acoustic system is described in which a support that supports the speaker and the frame is
supported only on the floor 110 side. In addition, although the example in which the acoustic
system was installed in the space in which the ceiling is not provided was shown in FIG.10 and
FIG.11, of course, you may install in the inside of the room which has a floor and a ceiling.
[0041]
[Configuration of Sound System 50] FIG. 10 is a cross-sectional view of a sound system according
to Embodiment 5 of the present invention. In the sound system 50 shown in FIG. 10, the flat
speaker 210 and the frame 220 are supported by an arched support 440 connected to the
plurality of lower pads 234. That is, the acoustic system 50 is movably fixed in the space having
the floor. FIG. 11 is a cross-sectional view of an acoustic system according to a modification of
Embodiment 5 of the present invention. In the acoustic system 51 shown in FIG. 11, the flat
speaker 210 and the frame 220 are supported by a curved support 450 connected to the lower
pad 234. That is, the acoustic system 51 is movably fixed in the space having the floor. Here, the
lower pad 234 of the sound system 51 extends in the direction in which the flat speaker 210 and
the frame 220 are installed. Further, the signal receiving device 240 is installed on the opposite
side of the flat speaker 210 and the side where the frame 220 is installed. In this way, the weight
of the flat speaker 210 and the frame 220 can prevent the sound system 51 from tilting or
falling down. Also in FIGS. 10 and 11, the frame 220 may be supported so as to be rotationally
movable with the support portions 440 and 450 so that the range in which the surface of the flat
speaker 210 and the surface of the floor 110 are parallel is included. . Further, in order to make
the directions of the flat speaker 210 and the frame 220 variable, the support portions 440 and
450 may have movable portions.
11-04-2019
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[0042]
As described above, according to the sound system of the fifth embodiment of the present
invention, the sound system can be installed on the upper part of the listener who does not easily
get in the way without damaging the inside of the room. By installing an acoustic system on top
of the listener, more natural instrumental sound can be provided. Further, since the sound system
can be installed without using the ceiling 120, the sound system can be installed even in a room
where the ceiling is very high and it is difficult to install on the ceiling, for example.
[0043]
[Configuration of Sound System 60] FIG. 12A is a cross-sectional view of a sound system
according to Embodiment 6 of the present invention. 12B is a perspective view showing the
configuration of the speaker in the acoustic system according to Embodiment 6 of the present
invention. In FIG. 12A, the first support member 231, the frame 220, and the flat speaker 210
are shown enlarged. Further, in FIG. 12B, the frame 220 and the first support member 231 are
omitted. In the acoustic system 60 shown in FIG. 12 (FIG. 12A and FIG. 12B), the flat speaker 210
has a vibrating portion 211 and a sound insulating portion 212.
[0044]
Between the vibration part 211 and the sound insulation part 212, the support | pillar 214 which
hold | maintains both space | interval is arrange | positioned. That is, the vibration unit 211 and
the sound insulation unit 212 are connected by the support 214. A space 216 is provided
between the vibration unit 211 and the sound insulation unit 212 by the support 214. As shown
in FIG. 12B, the support posts 214 are disposed in the vicinity of the corner portions of the
vibrating portion 211 and the sound insulating portion 212 (planar speaker 210). Moreover, as
shown to FIG. 12A, the opening part 222 is provided in the side of the flame | frame 220. As
shown in FIG. That is, the space 216 is connected to the external space in the side direction (the
side direction of the flat speaker 210). In other words, part of the sound wave emitted from the
vibration unit 211 in the direction of the sound insulation unit 212 is transmitted from the side
surface of the space 216 to the external space.
[0045]
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17
Here, although FIG. 12 illustrates the configuration in which the support posts 214 are disposed
in the vicinity of the corner of the flat speaker 210, the present invention is not limited to this
configuration. For example, the support posts 214 may be disposed near the side portions of the
flat speaker 210. Further, in the case where the planar shape of the flat speaker 210 is circular,
the supports 214 may be arranged at intervals, and the arrangement position of the supports
214 can be freely designed. In addition, if it is not necessary to perform sound insulation on the
ceiling side, the sound insulation unit 212 and the support 214 may not be provided.
[0046]
As described above, according to the sound system of the sixth embodiment of the present
invention, the sound system can be installed on the upper part of the listener who does not easily
get in the way without damaging the inside of the room. In addition, a space 216 is provided
between the vibration unit 211 and the sound insulation unit 212, and the side surface of the
space 216 is open, so that the sound wave emitted from the vibration unit 211 in the floor
direction and the sound wave emitted in the ceiling direction And the sound waves traveling to
the side direction of the speaker 210 can be weakened. Therefore, a more directional sound
system can be obtained. The above effects are particularly noticeable in sound waves of about 1
kHz or less, which are low in directivity and close to spherical waves.
[0047]
Modification 1 of Embodiment 6 FIG. 13A is a cross-sectional view of an acoustic system
according to a modification 1 of Embodiment 6 of the present invention. FIG. 13B is a perspective
view showing the configuration of the speaker in the acoustic system according to Variation 1 of
Embodiment 6 of the present invention. The acoustic system 61 shown in FIGS. 13A and 13B
(FIG. 13) is similar to the acoustic system 60 shown in FIG. 12 except that the acoustic system 61
is integrally formed with the frame 220 and the sound insulation portion 224. It differs from the
sound system 60.
[0048]
As shown in FIG. 13A, the vibrating unit 211 is supported by the frame 220. On the ceiling side
of the vibrating portion 211, a sound insulating portion 224 integrally formed with the frame
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220 is disposed. The frame 220 and the sound insulation part 224 are connected by a flat
connection part 226 provided with an opening 222. As shown in FIG. 13B, the connection
portion 226 is disposed so as to surround the periphery of the vibrating portion 211. That is, the
connection portions 226 are disposed on the four surfaces around the vibrating portion 211.
[0049]
Here, although FIG. 13 illustrates the configuration in which the frame 220, the sound insulation
unit 224, and the connection unit 226 are integrally formed, the present invention is not limited
to this configuration. For example, the frame 220, the sound insulation portion 224, and the
connection portion 226 may be formed as individual parts, and they may be bonded or joined.
Further, although FIG. 13 illustrates the configuration in which the connection portion 226 is
disposed on four surfaces around the vibration portion 211, the present invention is not limited
to this configuration, and at least one surface of the vibration portion 211 is disposed Just do it.
[0050]
Modification 2 of Sixth Embodiment FIG. 14A is a cross-sectional view of an acoustic system
according to a second modification of the sixth embodiment of the present invention. FIG. 14B is
a perspective view showing a configuration of a speaker in an acoustic system according to
Variation 2 of Embodiment 6 of the present invention. The acoustic system 62 shown in FIGS.
14A and 14B (FIG. 14) is similar to the acoustic system 61 shown in FIG. 13, but in the acoustic
system 62, the connection portion 226 is disposed on one side of the vibrating portion 211. The
other directions are different from the acoustic system 61 in that they are open.
[0051]
As shown in FIG. 14, the frame 220 and the sound insulation unit 224 are connected only by the
connection unit 226 disposed on one side of the vibrating unit 211. In other words, it can be said
that the sound insulation portion 224 is supported by the frame 220 in a cantilever structure.
[0052]
11-04-2019
19
Although FIG. 14 illustrates the configuration in which the opening portion 222 is provided in
the connection portion 226, the present invention is not limited to this configuration. For
example, the frame 220 and the sound insulation unit 224 may be connected by the connection
unit 226 in which the opening 222 is not provided. Moreover, although the structure which the
flame | frame 220 and the sound insulation part 224 were connected only by the connection part
226 was illustrated in FIG. 14, it is not limited to this structure. For example, a support 214
shown in FIG. 12 may be further disposed between the frame 220 and the sound insulation
portion 224.
[0053]
As mentioned above, according to the sound system concerning the modification of Embodiment
6 of the present invention, a sound system can be installed in the upper part of the listener who
does not get in the way easily, without damaging the inside of a room. Further, since the acoustic
system can be configured with fewer members, the assembly can be simplified, and the cost of
the acoustic system can be reduced.
[0054]
Here, in the first to sixth embodiments, although the support portions 230, 270, 440, 450
illustrate the configuration in which the side portions or the upper portions of the frames 220,
410 are supported, for example, two horizontally extending or two adjacent ones Further
supports may be arranged, with the frame being bridged between them. That is, two or more
adjacent horizontally extending supports may support the frame from below. In addition, the
structure may be such that the frame is supported from below at two or more places by
branching one support part 230, 270, 440, 450. Here, in the case where the second support
member 232 is installed between the opposing walls 130, the first support member 231 may not
be provided. For example, two disposed close to each other between the opposing walls 130 The
frame may be bridged between one or more second support members 232.
[0055]
Hereinafter, the acoustic system according to the sixth embodiment of the present invention is
manufactured, and the results of evaluating the directivity of the sound wave emitted from the
vibration unit will be specifically described. Here, Example 1 below is the result of an evaluation
11-04-2019
20
sample using the acoustic system 60 according to Embodiment 6, and Example 2 has a shape in
which the end portions of the vibrating portion 211 and the sound insulating portion 212 are
covered with the side surface 228 It is a result of evaluation sample.
[0056]
FIG. 15 is a view showing an outline of an evaluation sample shape of the embodiment of the
present invention. FIG. 15 (A) shows the evaluation sample shape of Example 1, and FIG. 15 (B)
shows the evaluation sample shape of Example 2. Here, in FIG. 15, for convenience of
explanation, only the vibration unit 211, the sound insulation unit 212, and the frame 220 are
displayed (the sound insulation unit in FIG. 15 (B) is disposed inside the frame 220).
[0057]
As shown in FIG. 15, the evaluation samples of Example 1 and Example 2 were designed to have
the same outer dimensions. That is, the difference between Example 1 and Example 2 shown in
FIG. The outer dimensions of the evaluation sample are 750 mm in length, 535 mm in width, and
60 mm in depth. Here, since the thickness in the depth direction of the vibration unit 211 and
the sound insulation unit 212 is 5 mm, the distance between the vibration unit 211 and the
sound insulation unit 212 is 50 mm. The dimensions of the vibrating portion 211 exposed from
the frame 220 are 650 mm in length and 435 mm in width. Here, the sound insulation part 212
and the flame | frame 220 were produced using the corrugated-cardboard.
[0058]
FIG. 16 is a diagram for explaining an evaluation method of the embodiment of the present
invention. As shown in FIG. 16, the evaluation of the embodiment was performed by installing
the microphones 500 at two places and measuring the magnitude of the sound emitted from the
flat speaker 210. The microphone 500-1 is installed at a position 500 mm away from the end of
the flat speaker 210 in the middle of the vibration unit 211 and the sound insulation unit 212.
Further, the microphone 500-2 is installed at a position 500 mm below the center of the
vibrating portion 211. Sound with a frequency of 100 Hz to 1000 Hz was output to the vibration
unit 211, and the volume was measured by the microphone 500.
11-04-2019
21
[0059]
FIG. 17 and FIG. 18 show the evaluation results of the embodiment of the present invention. FIG.
17 shows sound volume data measured by the microphone 500-1, and FIG. 18 shows sound
volume data measured by the microphone 500-2. In FIG. 17 and FIG. 18, solid line data (data
510, 530) are the evaluation results of the first embodiment, and dotted line data (data 520,
540) are the evaluation results of the second embodiment.
[0060]
As shown in FIG. 17, it was confirmed that the data 510 tends to have a smaller sound pressure
than the data 520. That is, the first embodiment can suppress the volume of the sound emitted in
the side direction of the flat speaker 210 smaller than the second embodiment. This is because it
is easier for the first embodiment which is opened laterally to be emitted sideward than the
second embodiment which is closed to the side, but the sound wave diffracted from the upper
side of the flat speaker to the side This is because the sound waves diffracted from the lower side
to the side weaken as a result. On the other hand, as shown in FIG. 18, it is confirmed that the
data 530 and the data 540 have substantially the same magnitude regardless of the frequency,
and for the sound emitted in the normal direction of the flat speaker 210, Example 1 and It was
confirmed that there was almost no difference from Example 2. That is, it was confirmed that
there is almost no difference between the first embodiment and the second embodiment as to the
sound pressure emitted from the flat speaker 210 to the listener side. Here, the volume of the
second embodiment is smaller than that of the first embodiment in a part of the low frequency
region of FIG. In addition, a specific spectrum (a spectrum in which peaks and valleys appear
alternately) appears in the region from 400 Hz to 1000 Hz in FIG. These are due to the influence
of reflection and the like in the measurement environment, and are not essentially the results due
to the difference between Example 1 and Example 2.
[0061]
FIGS. 19 and 20 show computer simulation results of acoustic radiation characteristics according
to the embodiment of the present invention. The simulation was performed by using a 2 m × 4
m two-dimensional space as an analysis region and arranging a flat speaker 210 in the middle
between the lower end and the upper end as shown in the drawing. The numerical values shown
in the figure indicate the sound pressure level at each observation point. A boundary between
different sound pressure levels is a line indicating approximately intermediate values of adjacent
11-04-2019
22
sound pressure levels. The sound pressure level is shown by an absolute value in FIGS. That is,
the sound pressure level 64 of FIG. 19 and the sound pressure level 64 of FIG. 20 are the same
sound pressure level.
[0062]
When the simulation results of Example 1 and Example 2 are compared, it is confirmed that
Example 1 is suppressed lower than Example 2 at the sound pressure level in the side direction
of the flat speaker 210. On the other hand, the sound pressure level on the sound insulation
portion 212 side of the flat speaker 210 (that is, the back side of the flat speaker 210) is lower in
the second embodiment than in the first embodiment.
[0063]
From the above results, it was found that the evaluation sample of Example 1 had higher
directivity than the evaluation sample of Example 2. Therefore, it has been found that the
structure shown in the first embodiment is suitable for realizing the planar speaker 210 with
high directivity.
[0064]
On the other hand, when it was desired to suppress the sound leakage to the rear surface side of
the flat speaker 210, it was found that the flat speaker 210 having the side surface 228 can be
considered as one of the realization methods as shown in the second embodiment.
[0065]
In addition, this invention is not limited to said embodiment, It is possible to change suitably in
the range which does not deviate from the meaning.
[0066]
10, 11, 20, 21, 30, 40, 50, 51, 60, 61, 62: sound system, 100: room, 110: floor, 120: ceiling, 130:
wall, 210: flat speaker, 211: vibrating part , 212, 224: sound insulation part, 214: post, 216:
space, 220, 410: frame, 222: opening, 226: connection part, 230, 270, 440, 450: support part,
231: first support member, 232: second support member, 233: upper pad, 234: lower pad, 235,
236: connection portion, 240: signal receiving device, 241, 322: amplifier circuit, 242: D / A
11-04-2019
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converter, 243: communication unit, 250 : Mounting, 260: Hook and ceiling, 280: Duct rail, 281:
Connector, 310: Electric violin, 320: Signaling Communication device, 321: sound pickup unit,
323: A / D converter, 324: pickup, 400: curved surface speaker, 500: microphone, 510, 520,
530, 540: data
11-04-2019
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