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JP2011015249

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DESCRIPTION JP2011015249
An object of the present invention is to arrange a plurality of small and thin speaker units on a
diaphragm of each unit surface of an omnidirectional speaker approximating a spherical sound
source with a dodecahedron unit face by regular pentagonal unit surfaces and drive the entire
surface to eliminate divided vibrations. Enables piston vibration. A speaker unit of each unit
surface is formed of a flat magnetic circuit forming a plurality of annular magnetic gaps, and a
plurality of voice coils supported by a film-like diaphragm opposite to the magnetic gaps. In the
most linear development view of the unit plane, one of the voice coils in each unit plane is
divided into two, and the first voice coil of the first unit plane to the 72th C-shaped voice coil of
the twelfth unit plane The other divided from the other end of the C to the first voice coil from
the other end of the C to the first voice coil is sequentially connected by one writing, all voice
coils are connected in series, and the signal wire is attached to the first voice coil, The connected
sides of each unit surface are bent and the adjacent sides are joined to form a dodecahedron.
[Selected figure] Figure 1
Omnidirectional speaker
[0001]
A point sound source which is an ideal of a nondirectional speaker is approximated by a small
spherical sound source, and the spherical sound source itself is approximated by a polyhedral
sound source by polygonal unit planes. The present invention relates to a compact nondirectional
speaker capable of selecting a dodecahedron having a regular pentagon as a unit face as a
polyhedron in view of practicality and driving the entire twelve diaphragms respectively.
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[0002]
For a speaker or a speaker unit aiming at approximation of an ideal point sound source, nondirectionality and compactness are essential requirements, and in particular, one of the present
inventors previously proposed in Japanese Patent Application No. 2009-088946. The compact
and thin type “full drive speaker” provides a speaker unit that can be arranged in high density
with a large number on the diaphragm surface, and is applied to a polyhedron to realize a
compact nondirectional speaker. It is useful. On the other hand, even if it is considered that the
number of faces is extremely increased as a polyhedron approximating a spherical sound source,
or it becomes theoretically approximating a sphere, there are technical problems and cost
problems in the actual manufacturing aspect. Many are not suitable for practical use. Conversely,
even if a triangle is selected as the smallest unit plane, for example, when the above-mentioned
high-density array type speaker unit is adopted, the number of usable units is limited, and the
degree of filling decreases, which is unsuitable. From these various points, it is advantageous to
adopt a dodecahedron having a unit face of regular pentagon, which is conventionally used
widely.
[0003]
Conventional non-directional speakers that approximate a spherical sound source with a
dodecahedron can be roughly classified into the following three types. In (1), a pentagonal unit
surface is regarded as a baffle plate and one speaker unit is attached thereto, and (2) is a
diaphragm as a diaphragm on a pentagonal unit surface, and a voice coil from its inner surface
And (3) are not a film but an elastic diaphragm with an edge attached to the unit surface and
driven by a voice coil and a circular magnetic circuit from the inner surface.
[0004]
These conventional speakers have the following problems. In the case of (1), the outer
circumference circle of the speaker unit is a circle having a smaller diameter or an inscribed
circle of a unit plane pentagon, and the remaining pentagon outside this circle remains as an
undriven area, The directivity characteristics of the speaker unit in each unit plane will be
reflected in the overall characteristics, and therefore both miniaturization and non-directionality
can not be realized.
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2
[0005]
In the cases of (2) and (3), the height of the magnetic circuit and the vibration system is limited
due to the restriction of the space inside the unit plane, so that the use of a large diameter voice
coil can not be performed. Therefore, the drive of the diaphragm is limited to the central region,
and the region that enables the piston oscillation is narrowed. Moreover, the vibration mode in
the case of (2) and (3) is likely to produce divided vibration, in which case the external shape of
the speaker has directivity even if it is nondirectional, and the quality as a sound source of
spherical sound source approximation Will fall.
[0006]
As a result, in any of these cases (1) to (3), the speaker is miniaturized to such an extent that it
can be said to be a nondirectional spherical sound source, and a speaker having a sufficient
piston vibration area is not realized. Furthermore, in any case, it is necessary to individually
assemble the speaker elements housed in 12 pentagonal unit planes and wire them inside while
assembling them into a dodecahedron, making the production complicated and expensive.
Become.
[0007]
Unexamined-Japanese-Patent No. 2006-311349
[0008]
In the present invention, as a problem to be solved, divided vibration is eliminated by arranging a
plurality of small and thin speaker units on each of the diaphragms of the unit surface to drive
the entire surface, and piston vibration is enabled. An object of the present invention is to
provide a compact nondirectional speaker which approximates a spherical sound source by a
dodecahedron with a pentagonal unit plane.
[0009]
The omnidirectional speaker according to claim 1 according to the present invention is a
dodecahedron having a regular pentagon as a unit plane, and each unit plane has a plurality of
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flat magnetic circuits each forming an annular magnetic gap, and a unit plane. A frame having a
pentagonal outer shape and holding a plurality of magnetic circuits in the plane, and a plurality
of circular voice coils respectively formed corresponding to the respective magnetic gaps and
sequentially connected by connecting wires A diaphragm having a pentagonal outer shape of a
unit plane and carrying a plurality of voice coils facing each other of a magnetic gap and carrying
the voice coil, and an end point of connection of the voice coil of each unit plane is a voice coil of
an adjacent unit plane The voice coil is connected in series via a bridge wire at the starting point
of to connect all twelve voice coils.
According to a second aspect of the present invention, in the nondirectional speaker according to
the first aspect, the magnetic gap of the magnetic circuit and the voice coil are respectively the
center of the regular pentagonal unit plane and the center of the line connecting each vertex to
the center. It is characterized in that it consists of six pieces arranged concentrically to each
other.
According to a third aspect of the present invention, in the nondirectional speaker according to
the first aspect, each unit surface of the dodecahedron is formed by integrating a diaphragm
carrying a voice coil with a frame holding a magnetic circuit. Do. According to a fourth aspect of
the present invention, in the nondirectional speaker according to the first aspect, the
dodecahedron is constituted by a unit surface consisting of a frame for holding a magnetic circuit
and covered with a diaphragm for carrying a voice coil. It is characterized by According to a fifth
aspect of the present invention, in the nondirectional speaker according to the second aspect, at
least the diaphragm carrying the voice coil is connected to the adjacent unit plane only on one
side in the developed state of all unit planes. The voice coil of all unit planes connected on two
sides with the unit planes other than the second, and one start end obtained by dividing one of a
pair of signal lines in the circumferential direction of the first voice coil of the first unit plane The
second to sixth voice coils are then connected one after another by one of a pair of connecting
wires, and one end of the sixth voice coil is divided into first and second ends. Of the seventh
voice coil of the second unit plane via one of a pair of bridges across the connecting side of the
unit planes of the second unit plane, and so on in the same manner. The 71st voice coil of the
12th unit plane from the 7th voice coil Of the 71st voice coil is connected to one end of the Cshaped 72nd voice coil by connecting one end of the 71st voice coil to the other end of the 71st
voice coil. Fold back, connect the other end of the 72nd voice coil to the other divided start of the
71st voice coil, and thereafter connect the other of the 71st to the first voice coils in turn into a
pair of connecting wires The other end of the first voice coil is connected to the other of the pair
of signal wires, and the other end of the first voice coil is connected in a one-stroke pattern. I
assume.
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[0010]
By enabling the arrangement of multiple, preferably six, small and thin speaker units at high
density with respect to the diaphragm in each unit face of a dodecahedral regular pentagon, the
entire surface drive of the diaphragm becomes possible, and it is used The divided vibration in
the band can be easily eliminated, and as a result, the diaphragm of the twelve surfaces can
perform piston vibration in a wide band, and a high quality, wide band nondirectional speaker
approximating a spherical sound source can be realized.
[0011]
The use of a thin speaker unit reduces the depth dimension of each unit surface, enabling the
realization of a significantly smaller dodecahedron speaker as a whole, and at the same time a
small dodecahedron for ultra high frequency range is realized. obtain.
[0012]
If a voice coil is formed as a flexible coil by printed wiring in a single-stroke pattern on a
diaphragm forming a unit surface of 12 consecutive faces, wiring connection work inside the
dodecahedron of the unit surface becomes unnecessary, and If a diaphragm is attached on a
frame with a magnetic circuit forming a dihedron, or if the diaphragm and magnetic circuit are
integrated into one unit, assembling the dodecahedron completes everything including the
connection operation.
[0013]
FIG. 1 is a perspective view of a dodecahedron-corrected nondirectional speaker having a regular
pentagonal unit face according to an embodiment of the present invention.
(A) of FIG. 2 is a plan view of the inner side of the magnetic circuit of the unit face of the
dodecahedron in the embodiment of FIG. 1, (B) is a side view thereof.
FIG. 3 is a developed view adopted for the dodecahedron in the embodiment of FIG. 1, and the
voice coil, which is originally concealed by the diaphragm and is disposed six by six in each unit
plane of the regular pentagon, has the connection mode It is represented by a solid line to clarify
the
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FIG. 4 shows the construction principle of a small and thin speaker unit used in the present
invention, in which (A) is a plurality of connected magnetic gaps, (B) is a corresponding voice coil
connected ((A) C) shows the combined state of the magnetic gap and the voice coil, respectively.
FIG. 5 is an enlarged sectional view showing the speaker unit constituting the unit face of the
dodecahedron in the embodiment of FIG.
[0014]
In the present invention, how to combine and use the small and thin speaker unit of the abovementioned “full-area drive speaker” of the above-mentioned invention with a dodecahedron
whose unit face is a regular pentagon as shown in FIGS. 1 to 3 Although the subject matter of the
present invention is the subject of the present invention, an outline of the configuration of the
full drive speaker unit will be described with reference to FIG. 4 before the present invention is
clarified.
[0015]
In FIG. 4, (A) is a plurality of circular magnetic gaps MG arranged in a connected arrangement,
the outside of the double circle represents a circular hole of a flat magnet or yoke, and the inner
concentric circle represents a flat pole piece or magnet.
(B) is a plurality of circular voice coils VC made of copper wire, for example, corresponding to the
magnetic gap MG, and all the coils are divided into upper and lower halves except the voice coil
at the left end is C-shaped and adjacent The upper half of the coil is connected to the upper half,
and the lower half is connected from the right to the front of the left via a pair of parallel copper
wires, and the front near the left is C-shaped at the left Connect to both ends of the spiral coil.
That is, after one of the upper and lower halves is traced sequentially from one of the right end
connecting wires of the right end coil and a U-turn is made with the left end C-shaped coil, the
other upper and lower halves are sequentially traced to the other of the right connecting wires
All voice coils are connected in series by a so-called one-stroke pattern. The rightmost connection
line is used as a signal input / output line. (C) shows a state in which the row of the magnetic gap
MG and the row of the voice coil VC face each other. In practice, the voice coil VC is printed on a
diaphragm made of, for example, a PI film, placed on a magnetic gap MG with a non-woven fabric
interposed therebetween, and the periphery of the diaphragm is bonded to a frame to form a
speaker unit.
[0016]
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With the above configuration, the full drive speaker unit used in the present invention
significantly extends the effective wire length of the voice coil per area, and by combining a
plurality of small and thin magnetic circuits and the voice coil, the area and shape of the
diaphragm The degree of freedom is increased, and the overall thickness can be sufficiently
reduced.
[0017]
As described above, in the embodiment according to the present invention, a dodecahedron
having a regular pentagon as a unit plane which can keep the degree of filling of the speaker unit
high is adopted as an approximation of a spherical sound source, and its perspective view is
shown in FIG.
Each of the regular pentagonal unit surfaces 10 whose surface is the diaphragm 1 carries a total
of six circular voice coils VC, one at the center and five on the line connecting the center and
each apex of the pentagon. As shown in FIG. 2A, the six annular magnetic gaps MG formed by the
magnetic circuits 5 and 6 face each other on the inner surface side of the unit surface 10 in a
concentric relationship with the voice coil VC. Details of the configuration of the speaker unit
forming the unit surface 10 will be described later with reference to FIG.
[0018]
A dodecahedron is formed by the unit plane of the developed view form shown in FIG. There are
several types of pentagonal arrays in the dodecahedron deployment, but the closest to a straight
line is a nearly S-shaped deployment, that is, the pentagons on both sides are only one side and
the other pentagons are The developed view of FIG. 3 joined to each adjacent pentagon on two
sides is adopted when it is intended to connect a total of 72 voice coils in series in the one-stroke
pattern described for FIG. 4 one after another. It is.
[0019]
The voice coils VC-1 to VC-72 are connected as follows. Connect one of the pair of signal lines
SL-1 to one of the starting ends of the first voice coil VC-1 on the diaphragm 1-1 of the first unit
surface 10 divided into two in the circumferential direction; The two divided ones of the sixth
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voice coil VC-6 are sequentially connected by one of the pair of connection lines CL, and the two
divided ends of the sixth voice coil VC-6 are the first and second ends. The seventh voice coil VC7 on the second diaphragm 1-2 via one of a pair of bridging wires BL straddling the joint side
between the diaphragms 1-1 and 1-2 of the unit plane. Connect to the beginning of one of the
two halves, and repeat the same connection, repeating the seventh voice coil VC-7 of the second
diaphragm 1-2 to the 71st voice of the last twelfth diaphragm 1-12. The 71st voice coil VC-71 is
connected by one of a pair of connecting wires sequentially up to one divided starting end of the
coil VC-71. One end of the two halves is connected to one end of the last 72nd voice coil VC-72
that is C-shaped without 2 minutes, and the connection is folded back, and the 72th C-shaped
voice coil VC-72 The other end of the 71st voice coil VC-71 is connected to the other divided
start end of the 71st voice coil VC-71, and thereafter the other half of the 71st to the first voice
coil VC-71 to VC-1 is divided in order, The other end of the first voice coil VC-1 is connected to
the other of the pair of signal lines SL, and the other end of the first voice coil VC-1 is connected
to the other of the pair of connection lines CL via the other of the pair of bridge lines BL. Thus, all
the voice coils VC-1 to VC-72 of the twelve diaphragms 1-1 to 1-12 are connected in series as a
one-turn coil. The developed view of FIG. 3 thus shows twelve diaphragms in which all 72 voice
coils including all 12 unit planes 10 are connected in series.
[0020]
The 12 voice coils VC-1 to VC-72 are printed on the surface of the diaphragm made of, for
example, a PI film in the pattern of the developed view of FIG. 1-1 to 1-12 are formed and
combined with a flat magnetic circuit MC with the configuration of each unit surface 10 shown in
the exploded enlarged cross sectional view of FIG. The six annular magnetic gaps MG face each
other concentrically as described with reference to FIG. 4 (C).
[0021]
The flat magnetic circuit MC may be either of an inner magnet type or an outer magnet type, and
six disk-shaped magnetic cores or center poles disposed at the center of each regular pentagonal
unit surface 10 and at the midpoint between the center and each apex angle. The six annular
magnetic gaps MG are formed by the yoke plate 5 and the yoke plate or magnet plate 6 having
six round holes concentrically accommodating each of these.
In FIG. 5, the six voice coils VC and the six magnetic gaps MG are all shown linearly expanded.
Preferably, for example, the non-woven fabric 4 is brought into contact with the opening side of
the magnetic gap MG, the frame 3 is mounted on each edge of the pentagon, and the diaphragm
1 carrying the voice coil VC is attached to the upper surface thereof. 10 are formed. The side
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surface of each side of the unit surface 10 is chamfered at an angle of 116.6 degrees with
respect to the extended game with the diaphragm 1 side as a surface, which facilitates the
formation of a dodecahedron. The length of one side of pentagonal unit face 10 is about 20 mm,
the diameter of magnetic gap is 8.8 to 6.5 mm, the height of magnetic circuit is about 2 mm, the
amplitude of diaphragm is added, and the total height is about 2.5 mm However, it is possible to
make it even smaller. If the diameter of the magnetic gap is further reduced, the number of
speaker units for each unit plane, that is, the number of driving points can be increased.
[0022]
Note that after a dodecahedron is formed by integrating only the magnetic circuit MC and the
frame 3 as the unit surface 10, a diaphragm in the state of the developed view of FIG. 3 may be
attached to the surface. Also, the development pattern of the dodecahedron is not limited to that
of FIG. 3, and other similar or approximate patterns may be adopted. The point is that the pattern
may be any pattern that can be easily assembled in a dodecahedron by connecting all twelve
voice coils in series with a single stroke through a bridge wire that straddles the connecting side
between adjacent unit faces.
[0023]
10 unit plane VC voice coil VC-1 to VC-72 1st voice coil to 72nd voice coil CL connection wire BL
bridge wire SL-1 signal wire SL-2 signal wire MG magnetic gap MC magnetic circuit 1 diaphragm
1-1 to 1-12 1st diaphragm 12th diaphragm 3 frame 4 non-woven fabric 5 core or center pole 6
yoke plate or magnet plate
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