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JP2006186778

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DESCRIPTION JP2006186778
PROBLEM TO BE SOLVED: To provide a horizontal nondirectional omnidirectional small speaker
device having a small occupied floor area for installation. SOLUTION: A plurality of speaker
devices having a speaker attached to each side of a polygonal columnar casing with n sides are
offset at an angle of 180 / n around a vertical central axis and stacked to form an entire
circumference of a horizontal plane. While being able to realize a horizontal surface
nondirectional speaker device excellent in the balance of frequency components in position, it
becomes possible to reduce the installation floor area of the horizontal surface nondirectional
speaker device. In addition, by replacing the cone type speaker with a flat type speaker, it is
possible to further miniaturize the speaker box and to reduce the installation area. [Selected
figure] Figure 2
Nondirectional speaker device
[0001]
The present invention relates to a speaker device which is a man-machine interface of an audio
system, and more particularly to a means for realizing a non-directional, space-saving speaker
device in a horizontal plane.
[0002]
FIG. 1 is a conventional example of a horizontal nondirectional speaker apparatus according to
the prior art.
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1 (a) is an external perspective view, and FIG. 1 (b) is a cross-sectional view cut along a cutting
line C-C indicated by a dashed line in FIG. 1 (a), and acoustic orientation of the horizontal surface
of the speaker device FIG. 6 is a directional characteristic diagram schematically showing the
polarity by a vector diagram in a dashed line.
[0003]
For one of the four cone-shaped speakers 2 in FIG. 1B, the horizontal direction directivity
characteristic of the sound pressure level emitted from the cone-shaped speaker 2 will be
described by a vector diagram. The directivity of the low frequency band sound emitted from the
cone type speaker 2 is slow, and at the position equidistant from the cone type speaker 2, the
sound pressure level on the sound emission axis "X" and the sound pressure level There is no big
difference in the sound pressure level at the position of the direction "Y" or "Z" having an angle
from the sound axis "X".
[0004]
However, for voices in the middle / high frequency band exceeding 3000 Hz, as in the directivity
characteristic diagram shown by the dashed line in FIG. 1B, in directions “Y” and “Z” having
an angle from the sound emission axis “X” The sound pressure level indicates that the sound
pressure level decreases significantly with distance from the sound emission axis "X". In other
words, although the sound pressure level of the bass is high on the “Z” axis in the directivity
characteristic diagram shown by the chain line in FIG. 1 (b), the sound pressure level of the
middle / high frequency band voice is extremely low, It is recognized as a voice with poor
frequency component balance. Furthermore, in the corner direction of the nondirectional speaker
device 1 where the angle from the sound emission axis "X" becomes large, there is a region
where the sound pressure level of the voice of particularly high frequency band does not reach,
and as a nondirectional speaker device It shows sufficient directional characteristics.
[0005]
As means for realizing an omnidirectional speaker device, means is provided for disposing a
speaker on the outer surface of a spherical surface or on each side surface in a polygonal
prismatic housing. As an example, means by disposing and installing a large number of speakers
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2
on the outer surface of a sphere, means by making the circumferential side surface of the
enclosure into six faces and means by making three non-adjacent side faces into a speaker
mounting face, or Measures such as stacking the speaker boxes up and down have been devised.
[0006]
Each of the above-described means for realizing an omnidirectional speaker device has a
drawback that the housing size of the speaker box for housing a large number of speakers is
increased, and therefore a large installation space is required. doing. [Patent Document 1]
Japanese Patent Application Publication No. 2001-8284 "Spherical and cylindrical speaker
device" Japanese Utility Model Application Publication No. 1-133894 "Speaker device" Japanese
Patent Application Publication No. 11-155182 "Speaker system"
[0007]
As a conventional example of the horizontal direction non-directional speaker device, a technical
means has been applied, in which speakers are provided on each side of a polygonal prismatic
housing and the noise is emitted radially from the sound emission openings of the speakers. .
However, the sound emission axis going outward from the center of the speaker diaphragm has
been limited to the number of side surfaces of the housing that accommodates the speaker. For
this reason, in order to realize a more excellent horizontal surface omnidirectional speaker
device, the number of sides of the polygonal prismatic housing is increased, or a cylindrical
housing with an infinite number of polygonal prisms is used. Although it is possible by means of
arranging a large number of loudspeakers on each side of the casing, increasing the number of
sides of the polygonal prismatic casing increases the size of the casing of the loudspeaker device
and installs the loudspeaker device. There is a problem that the occupied floor area becomes
large.
[0008]
In the nondirectional speaker device, the vertical central axes of a plurality of speaker devices in
which the speakers are attached to the side surfaces of a polygonal columnar casing having n
sides are shared by 180 / n around the vertical central axis By offsetting and stacking at an angle
of?, It is possible to increase the sound emission axis from the speaker without increasing the
installation floor area of the speaker device, and the horizontal directivity can be significantly
improved.
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[0009]
In the nondirectional speaker device described above, the interior of the housing of the speaker
device in which the speakers are arranged vertically is not divided up and down, the internal
space is an integral housing, and the side is twisted around the vertical central axis By forming
with a continuous surface, it is possible to increase the volume of the resonance box in the
housing of the speaker device, and a bass reflex type speaker device using the principle of the
Helmholtz resonance box for emphasizing the audio output in the low frequency band It is
possible to enhance the emphasizing effect in the case of the above, and furthermore, it is
possible to realize a horizontal omnidirectional speaker device that brings about a novel
atmosphere also in terms of appearance design.
[0010]
In the above-mentioned nondirectional speaker device, the number of side surfaces of the
polygonal prismatic housing is not large. For example, a normal cone type loudspeaker
comprising a conical diaphragm in a triangular prismatic housing has a narrow internal space.
When housed in the triangular prismatic housing, permanent magnets and magnet yokes located
at the rear end of the speaker are component elements of the speaker, such as permanent
magnets and magnet yokes approaching each other or colliding with each other in a narrow
triangular prismatic housing It becomes impossible to accommodate.
[0011]
In such a case, the cone-type loudspeaker having a conical diaphragm is replaced with a planar
loudspeaker having a planar diaphragm, or the mounting position of the loudspeaker on each
side of the polygonal prismatic housing is By offsetting in the vertical direction, even in a narrow
triangular prism-shaped housing, it can be attached to each side and housed in the housing,
further downsizing of the housing size of the nondirectional speaker device As a result, the floor
space for installing the speaker device can be reduced, and the space saving effect can be further
enhanced.
[0012]
Horizontally omnidirectional with a small occupied floor area for installing the speaker devices
by offsetting the angles around a vertical central axis and stacking up a plurality of speaker
devices having speakers arranged on each side of a polygonal columnar casing Speaker device
can be realized.
[0013]
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In addition, by twisting the side surface of the speaker device in which the speakers are arranged
at the top and bottom around the vertical central axis and forming an integral continuous
surface, the speaker rear space in the speaker device is shared. It becomes possible to enhance
the audio output enhancement effect in the low frequency band when applied to a bass reflex
type speaker device using the Helmholtz resonance box principle for emphasizing the audio
output in the low frequency band, and further, the appearance design In addition, it is possible to
realize a horizontal nondirectional speaker device that produces a novel atmosphere.
[0014]
FIG. 2 shows a first embodiment according to the present invention, and FIG. 2 (a) shows a lower
square speaker device 12 and a lower speaker device in which a square speaker 2 is disposed on
four sides of a casing of the speaker device. The upper stage speaker device 11 having the same
shape as 12 shares the vertical central axis, is mounted, and the mutual angle between the lower
stage speaker device 12 and the upper stage speaker device 11 is offset 45 degrees around the
vertical central axis It is an external appearance perspective view of a directional speaker
apparatus.
[0015]
FIG.2 (b) is a cross-sectional view cut | disconnected along the cutting plane line DD shown with
a broken line in FIG. 2 (a).
In FIG. 2 (b), the directional characteristics of the medium / high frequency band sound emitted
from each cone-type speaker 2 are schematically shown by a chain line.
As a result of sharing and mounting the vertical central axis of the lower stage speaker device 12
and the upper stage speaker device 11 of the same shape, the horizontal directivity of the middle
/ high frequency band audio is as shown by a dashed line in FIG. FIG. 1B shows a characteristic in
which gaps of directivity characteristics of middle / high frequency band voices are filled by the
single rectangular speaker device 1 shown in FIG. 1B, and speaker devices 12 stacked in upper
and lower two stages and horizontal surfaces from the speaker device 11 It is possible to realize
an omnidirectional speaker device capable of listening to the same characteristic sound with
excellent balance of frequency components at any location, at the listening position where the
distances are equal above.
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[0016]
Further, in the embodiment of FIG. 2, the upper and lower speaker devices 11 and 12 are
rotatably coupled to each other, and provided with a structure capable of giving a click feeling or
being able to be locked. The same effect can be obtained even if it can be positioned and fixed by
[0017]
FIG. 3 is a connection diagram of the cone type loudspeakers 2 incorporated in the
nondirectional loudspeaker apparatus shown in FIG. 2 according to the first embodiment of the
present invention.
The drive voltage input to the input terminal 13 drives all the cone-type speakers 2
accommodated in the upper stage speaker device 11 in phase, and all the cone-type speakers
accommodated in the lower stage speaker device 12 similarly in phase .
Therefore, the density relationship of the sound pressure emitted from all the cone type speakers
2 of the upper and lower ends becomes the same phase.
[0018]
FIG. 4 shows a pole type speaker device 21 according to a second embodiment of the present
invention, and FIG. 4 (a) is an external perspective view, FIG. 4 (b) is an overhead view of a top
surface, and FIG. is there.
The pole-type speaker device 21 composed of four sides is provided with the cone-type speakers
2 at the upper and lower sides of all side surfaces, and a base stand 24 for installing the poletype speaker device 21 on the floor at the lower part. .
The pole-type speaker device 21 is constituted by a continuous surface in which the side surfaces
on which the cone-type speakers 2 are disposed at the top and bottom are integrally formed, and
the vertical center at the middle position of each cone-type speaker 2 disposed at the top It is
twisted at an angle of 45 degrees around the axis, and forms an upper side surface 22 and a
lower side surface 23 with the upper and lower torsion portions 20 as boundaries.
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[0019]
In the second embodiment of the present invention, as shown in FIG. 4 (b), the top surface
connected to the internal space of the pole type speaker device 21 is opened to the atmosphere
and serves as the bass reflex port 25 of the bass reflex type loudspeaker device. .
The sound emission axis from the bass reflex port 25 is not directed in the listening direction
around the pole type speaker device 21, but the voice in the low frequency band outputted from
the bass reflex port 25 is compared to the voice in the middle / high frequency band. Because
there is a slow directivity, there is no practical problem.
[0020]
FIG. 5 shows a comparative example of the present invention.
If the width dimension of the side surface of the polygonal pillar-shaped speaker device is the
same, the internal volume of the polygonal pillar-shaped speaker device formed by the side
surface is the smallest in the triangular prism-shaped speaker device, and FIG. FIG. 6 shows an
external perspective view of a triangular columnar speaker device 31. FIG. 5 (b) is a crosssectional view taken along a cutting line shown by a chain line E-E in FIG. 5 (a). The cone type
speaker 2 has a permanent magnet or magnet yoke as an element part at the rear, and the
element parts constituting the cone type speaker 2 collide with each other as shown by the
hatched area in FIG. 5 (b). It becomes impossible to arrange the cone-shaped speaker 2 on all the
side surfaces of the triangular pillar-shaped speaker device 31 on the same horizontal surface.
[0021]
In order to cope with the above problems, as shown in FIG. 6 as a third embodiment of the
present invention, the speaker attached to the side surface of the triangular prismatic speaker
device 32 is usually changed to a cone type speaker 2 which is often used. By using the flat
speaker 33 for driving the diaphragm, it can be accommodated in the housing of the triangular
prism-like speaker device 32 having a small inner volume.
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[0022]
If the width dimension of the side surface of the polygonal pillar-shaped speaker device is the
same, the internal volume is the smallest of the triangular prismatic speaker device, and the
cone-type speaker 2 constitutes a permanent magnet or magnet yoke as an element portion at
the rear, (B) In the area shown by oblique lines in the (b), it is impossible to arrange the cone type
speaker 2 on all the side surfaces of the triangular prismatic speaker device 31 on the same
horizontal surface.
In order to cope with this problem, as shown in FIG. 7A as a fourth embodiment of the present
invention, the attachment positions of the cone-shaped speakers 2 to the side surfaces of the
triangular prismatic speaker device 34 are offset in order in the vertical direction.
[0023]
In detail, as shown in the side development view of the triangular prismatic speaker device 34 in
FIG. 7B, the mounting positions of the cone-shaped loudspeakers 2 on each side of the triangular
prismatic speaker device 34 are sequentially offset in the vertical direction. As shown in FIG. 7
(c), the space within the triangular prismatic speaker box 34 with a small internal volume is
effectively utilized without colliding the permanent magnets and the magnet yokes at the rear of
each cone type loudspeaker 2, and the triangular prismatic speaker box As a result, it is possible
to realize a small horizontal non-directional speaker device with a small occupied floor area when
installing 34.
[0024]
In the present invention, an omnidirectional speaker device configured by a polygonal columnar
casing is described as an example, but the present invention is not limited to this, and a
cylindrical shape in which the number of sides of the polygonal columnar casing is infinite, It is
equally preferable to apply any of a pyramid shape, a cone shape, or a casing shape derived from
a polygonal column, such as a trapezoidal vertical cross section, to the casing of the speaker
device of the present invention.
[0025]
(A) is an external appearance perspective view of the Example of the nondirectional speaker
apparatus which attached the speaker to all the side surfaces of the square pillar-shaped speaker
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box, (b) is a cross-sectional view, and horizontal surface directivity characteristics.
In the first embodiment of the present invention, (a) is an external perspective view in which a
square pillar-shaped speaker box stacked in two stages is offset 45 degrees around a vertical
central axis, (b) is a cross sectional view, and a horizontal surface It is a directional characteristic.
It is a wiring diagram of the speaker in the nondirectional speaker apparatus shown in FIG. In a
second embodiment of the present invention, (a) is an external perspective view, (b) is a top view,
and (c) is a side view. (A) is an external appearance perspective view of the nondirectional
speaker apparatus which attached the cone-type speaker to all the side surfaces of the triangular
prism-shaped speaker box, (b) is a cross-sectional view. In the third embodiment of the present
invention, (a) is an external perspective view of a nondirectional speaker apparatus in which a
cone type speaker incorporated in the speaker box shown in FIG. 5 is replaced with a flat type
speaker, (b) is a cross section FIG. In the fourth embodiment of the present invention, (a) is an
external perspective view, (b) is a side developed view, and (c) is a cross section cut along a
cutting line indicated by a chain line F-F in (a). FIG.
Explanation of sign
[0026]
1: Speaker device 2: Cone type speaker 11: Upper speaker device 12: Lower speaker device 13:
Input terminal 20: Upper and lower twisting part 21: Pole type speaker device 22: Top side 23:
Bottom side 24: Stand base 25: Bass reflex port 31: Triangular speaker device 32: Triangular
speaker device 33: Flat speaker 34: Triangular speaker device
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