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DESCRIPTION JP2013187661

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DESCRIPTION JP2013187661
Abstract [Problem] The structure of a flat speaker with high efficiency, high performance, wide
design freedom and high practicability. A voice coil is formed by bending one strip-shaped
conductor in a zigzag along a magnetic path formed of a collection of square magnetic poles. A
zigzag coil is formed so that the winding directions of the four sides of one square are the same,
and the winding directions of adjacent squares are opposite to each other. A square-shaped
magnetic pole group, which fits in the square of the zigzag coil, is disposed on a flat plate of one
magnetic body. The adjacent magnetic poles are arranged or magnetized so as to have opposite
polarity. [Selected figure] Figure 1
Voice coil, magnetic circuit, magnetizing method, speaker and sound reproduction device
[0001]
Throughout the full text including claims, the contents in {} shall take precedence over the
contents outside {}. The terms defined in the claims are the same in the description. Ideal flat
speaker that voice coil that magnetic circuit
[0002]
What is important in a flat speaker is {securement of driving force} and {securement of rigidity of
diaphragm}. Although securing a driving force is relatively easy, a wide flat, high-rigidity
diaphragm has many difficult problems in the selection of materials and shape design. The
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design of the magnetic circuit of the flat speaker requires a high magnetic flux density when
driving force is required, so it requires the thickness of the material of the magnetic path, as well
as the performance of the permanent magnet, and the thickness and performance are always
There is a trade-off relationship.
[0003]
The present invention relates to the structure of a speaker in which driving forces are distributed
on a plane. There are the following first, second and third issues.
[0004]
The first issue relates to surface drive where the driving force is distributed in a planar manner,
securing high driving force with high linearity over a wide frequency range.
[0005]
The second issue is high efficiency surface drive.
Over the whole plane, {high density distributed coils} and {a high density distribution {crossing
with {high density magnetic flux density}}} {minimization of {inductance component of coil in
magnetic circuit}} .
[0006]
The third issue is productivity. {High efficiency {magnetic circuit, structure of magnetic path,
structure of magnetic pole}}, shape and winding technology of magnetic gap of magnetic circuit,
assembling method. As described above, the first, second and third problems must be solved by
including a plurality of factors which are always in a trade-off relationship. To that end, it is
necessary to expand the limit range of the trade-off conditions and to be able to meet the
requirements of product design and product planning.
[0007]
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For the first problem, use a coil in which a strip-like conductor is bent in a square zigzag shape.
The winding directions from the winding start to the winding end of the {square coil units of
zigzag coils} are configured to be opposite to each other. A magnetic pole is provided in each
rectangular block in a zigzag shape, and the adjacent magnetic poles are magnetized so as to
have opposite polarities.
[0008]
With respect to the second problem, by distributing small magnets, although the driving force is
small, the magnetic flux density of the magnetic gap of each magnetic circuit is efficiently
increased.
[0009]
For the third problem, the zigzag coil is not a rotary winding machine but a press machine.
In order to stabilize the zigzag shape, which is a weak point of the zigzag coil, the diaphragm is
provided with a groove for inserting the edge of the zigzag, and the zigzag coil and the
diaphragm are integrated.
[0010]
There are the following first to ninth effects. First, planar drive in which the driving force is
distributed in a planar manner. Since the winding directions of the adjacent coils and the
magnetic poles adjacent to each other have opposite polarities, the force generated by the
current flowing through the coils has the same direction in all the coil units. By increasing the
number of coil units per unit area, the driving force can be distributed in a planar manner to a
practically ideal level. As for the thin structure, since it is a surface drive close to an ideal,
increasing the area of the diaphragm frees the problem of securing rigidity imposed on the
material of the diaphragm. The area and surface shape can be freely designed without sacrificing
the reproduction characteristics. Since the radiation area of the diaphragm can be increased and
the stroke of vibration can be reduced, this method is suitable for thin form. Furthermore,
because the magnetic parts are small, even if the magnetic flux density of the magnetic gap is
designed to be high, the local maximum magnetic flux is small, so it is possible to make the
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magnetic circuit as thin as possible without sacrificing reproduction performance. is there.
[0011]
Second, a strong driving force can be obtained by densifying {distribution of coil} and
{distribution of region of strong magnetic flux density crossing coil} over the entire plane.
Furthermore, since the winding directions of the coils corresponding to the adjacent magnetic
poles are opposite to each other, both {{reciprocal inductance component} between adjacent coil
units} and {counter electromotive force component by moving coil}}. The energy conversion
efficiency is increased. In particular, the cancellation of mutual inductance components can
significantly improve the conversion efficiency in the high frequency region.
[0012]
Third, it enables the production of a coil by a pressing process. Since the length of the coil in the
same area can be made much longer than the length of the periphery of the combined magnetic
circuit, a coil design meeting the required specification can be made, and the selection range
becomes wide.
[0013]
Fourth, by increasing the density of the zigzag, the coil length in the same area can be made
much longer, and the energy conversion efficiency from electricity to sound can be greatly
improved.
[0014]
Fifth, since the coils can be dispersed in a plane, the heat generated by the copper loss can be
dispersed, and as a result, the limit of the input power due to a local temperature rise can be
extended.
[0015]
Sixth, the shape of the acoustic radiation surface can be freely selected because the driving force
can be distributed in a plane.
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[0016]
Seventh, since the driving force can be dispersed in a surface distribution, it is not necessary to
increase the bending strength of the diaphragm even if the area of the diaphragm is wide.
Therefore, when obtaining the same sound pressure, the vibration area can be increased and the
vibration amplitude can be designed to be small.
This makes it possible to design a thin speaker with high performance, in particular, which is
excellent in bass reproduction ability, and the application of the required shape is greatly
expanded according to the appearance design priority of the product.
[0017]
Eighth, since the total magnetic flux per unit magnetic pole can be reduced, the planar magnetic
path can be designed to be thin.
Combined with the effect of reducing the vibration amplitude by increasing the area, the degree
of freedom in appearance design is enhanced.
[0018]
Ninth, it is not necessary to introduce new equipment because many {small and same size}
magnetic parts can utilize surface mounting technology and equipment used in the electronic
circuit assembly process. The assembly is easy because the magnetizing process can be inserted
after the assembly of the magnetic parts. Since the diaphragm with a large area is bonded on one
side to the coil unit with a small area, the bending strength of the diaphragm becomes extremely
large and the quality is stabilized.
[0019]
Explanatory drawing of one example of basic structure of the present invention (a) top view, (b)
AA 'cross section, (c) BB' cross sectional view 1 explanatory drawing of magnetic flux distribution
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inside circle (a) FIG. (B) Description of one example of the conductor of the coil (a) in the case of
one conductor, (b) in the case of five conductors (A) Top view, (b) AA 'cross section, (c) BB' cross
section, (d) back view, (e) Enlarged view of 53 parts of circle (F) An enlarged view of a circle 54
part An explanatory view of an embodiment of a lead wire drawing portion of a voice coil (a) a
broken line before bending, (b) a first bending view, (c) completion after double bending Fig., (D)
winding side view, (e) winding end side view, an illustration of an embodiment of the magnetizing
method, (a) top view of magnetic pole, (b) AA 'side view, (c) B -B 'side view
[0020]
{Zig-zag coil having a structure shown in FIG. 1 (a) having a plurality of conductors shown in FIG.
3 (b)} and {diaphragm for fixing a voice coil with a lattice groove} shown in FIG. 4} 6 and the
driver of the speaker by {the combined magnetic circuit shown in FIG. 1} and {the lead wire
drawing structure of the voice coil shown in FIG. 5} by the magnetization method shown in FIG.
[0021]
The following is a detailed description using the drawings.
FIG. 1 is an embodiment for explaining the whole of the present invention.
X1 to X8 indicate the position of the horizontal axis in the description of the drawing, and Y1 to
Y8 indicate the positions of the vertical axis in the description of the drawing. The figure is an
explanatory view of driving force generation in which the magnetic pole is composed of eight
longitudinal rows and eight lateral rows, for a total of 64 magnetic poles and a coil unit. For
example, the central coordinates of the 21 magnetic poles are X 1 Y 1, and the central
coordinates of the 24 magnetic poles are X 8 Y 2. Fig.1 (a) is an upper side figure, FIG.1 (b)
shows the AA cross section of Fig.1 (a). FIG.1 (C) shows the BB 'cross section of FIG. 1 (a).
[0022]
1 is a zig-zag coil, 101 is its winding start, 102 is its winding end, 11 and 13 and 15 black circles
are the front direction when viewed from the drawing, and 12 and 14 and 16 white circles are
the reverse direction to the front. , 21 is S, 22 is N, 23 is N, and 24 is S, respectively. There are
60 other magnetic poles besides the above four. 31, 32, 33 and 34 are perpendicular magnetic
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paths. There are 60 vertical magnetic paths in addition to the above four. 4 is a planar magnetic
path. Arrows shown on four sides of each coil unit of the zigzag coil indicate the winding
direction.
[0023]
The coil material starts from the winding start 101 and turns three sides of the X1Y2 pole
clockwise, and then turns three sides of the X1Y3 pole counterclockwise sequentially, and lasts
three sides of the last X1Y1 pole counterclockwise It ends, and the winding end of 102 is
reached. The winding directions around the magnetic poles of the zigzag coil are all clockwise
when the magnetic pole is N, and are all counterclockwise when the magnetic pole is S. Thus, the
zigzag coil and the magnetic pole are configured such that the product of {direction of current
flowing through the zigzag coil} and {direction of magnetic flux crossing the zigzag coil}, that is,
generated driving force, is in the same direction.
[0024]
For example, with respect to the four sides around the magnetic pole N of X1Y2, although the
two sides of the zigzag coil are connected continuously, the other two sides are connected but
not continuous. However, the winding direction is the same clockwise on all four sides. For the
four sides around the magnetic pole S of X2Y2, the four sides of the zigzag coil are continuously
left-handed. Although the three sides around the magnetic pole N of X2Y3 are continuous, the
other one side is not continuous but all four sides of the zigzag coil are clockwise. One side of
x1Y1 has no coil, but the other three sides are continuous and left-handed. Thus, all N poles are
all clockwise and all S poles are counterclockwise. Therefore, the driving force by the current
from the winding start to the winding end is in the opposite direction of the planar magnetic path
in all coil units.
[0025]
A uniform magnetic field is generated in the air gap between adjacent magnetic poles, and the
current flowing through the zigzag coil produces a uniform driving force throughout the zigzag
coil. The portion that generates the magnetomotive force may be any of {magnetic pole, vertical
magnetic path, planar magnetic path}. As there are many difficulties in assembling the assembled
magnetic circuit after magnetization, the assembly process is simplified by magnetizing when
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assembly and adhesion are completed.
[0026]
FIG. 2 is an explanatory view of the magnetic flux distribution between the magnetic poles of the
circled portions {51 and 52} of FIG. 2 (a) shows the portion 51 of FIG. 1, and FIG. 2 (b) shows the
portion 52 of FIG. Reference numeral 201 denotes an N pole of X3Y4 coordinates in FIG. 1, and
the S pole of {202, 203, 204, 205} surrounds the four sides thereof. {206, 207, 208} are
magnetic poles of {N, S, N}, respectively. 4 is a horizontal magnetic path. 306, 307 and 308 are
vertical magnetic paths. A zigzag coil 1 intersects the magnetic flux between the magnetic poles.
Arrows indicate the direction of magnetic field lines. The magnetic flux from N to S seen from the
top is nearly parallel between the four sides, but bulges out of the gap in the space where the
corners of the four magnetic poles gather. Since the zigzag coil is approximately orthogonal to
the quarter circle portion in this portion, this quarter circle portion also produces a driving force
without significantly reducing the efficiency.
[0027]
The magnetic flux between the magnetic poles 206 and 207 is generated by a magnetic loop
whose magnetic path is a horizontal magnetic path of {306 and 307 vertical magnetic paths} and
4. The magnetic circuit of the present invention does not require a magnetic path with a large
cross-sectional area because small magnets are dispersed instead of a magnetic path that guides
the magnetic flux from a large single magnet, as in a general speaker magnetic circuit. .
Therefore, since it can be functioned with a thin plate-like planar magnetic path, it is suitable for
a thin speaker.
[0028]
FIG. 3 shows an embodiment of a zigzag coil conductor. FIG. 1 (a) is an explanatory view in the
case of one conductor. FIG. 1 and FIG. 1 (b) are explanatory views in the case of a plurality of
conductors. 1 is a bobbin of a zigzag coil, 110 is a conductor in the case of one zigzag coil
conductor, 101 is a winding start, and 102 is a winding end. Arrows indicate the winding
direction. 111, 112, 113, 114, and 115 are the first, second, third, fourth, and fifth conductors in
the case of a plurality of conductors. {111 winding end connects with 112 winding start} {112
winding end connects with 113 winding start} {113 winding end connects with 114 winding
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start} {114 winding end connects with 115 winding start} And one conductor. When the coil has
a low impedance, the number of conductors is reduced, and when the coil has a high impedance,
the number of conductors is increased.
[0029]
FIG. 4 shows an embodiment of a method of fixing the zigzag shape of the zigzag coil. FIG. 4A is a
top view of the state in which the zigzag coil is fixed to {a groove provided in a diaphragm}. 4 (b)
is a cross-sectional view taken along the line AA ', FIG. 4 (c) is a cross-sectional view taken along
the line BB', FIG. 4 (d) is a rear view, and FIG. FIG. 4 (f) is an enlarged view of a circled portion 54
of FIG. 4 (b). 1 is a zigzag coil, 6 is a diaphragm for fixing a voice coil with a lattice groove, 61 is a
groove provided for inserting the edge portion of the zigzag coil, and 62 is a sectional shape of
the groove. The zigzag coil is unstable in shape because it is a thin strip of material. Similarly, the
diaphragm can not maintain a flat surface because it has a shape closer to a film than a plate. The
strength is increased by providing the grooves in the longitudinal and lateral directions on the
diaphragm, and by integrating the zigzag coil in the grooves to integrate them, a strong
diaphragm is obtained. The edge of the zig-zag coil is inserted into and bonded to the groove 61
of the {diaphragm for voice coil fixing with a grating groove}, and {dimension and shape of the
zig-zag coil} and {bending strength of the diaphragm} are dramatically stabilized. Do. As a result,
the zigzag coil can be housed in the air gap between the magnetic poles with high accuracy, the
precise relative positional relationship with the magnetic poles is maintained, and the reliability
is increased. Further, since the rigidity of the diaphragm is secured in a wide range, good
reproduction characteristics can be obtained.
[0030]
FIG. 5 is an explanatory view of an embodiment for making it easy to draw the lead wire from the
zigzag coil. FIG. 5 (a) shows the folds at both ends of the zigzag coil. FIG. 5 (b) shows a state in
which the first fold is folded. FIG. 5C shows a state in which the second fold is folded. Fig. 5 (d) is
a left side view of (c), and Fig. 5 (e) is a right side view of (c). In this state, since the surfaces of
both ends of the zigzag coil are in parallel with {the surface of the diaphragm shown in FIG. 4},
the terminals can be adhered to the diaphragm from each other. As a result, the lead wire can be
drawn out for a cheap shape. The extraction of the lead wire from the strip coil is extremely
important in making a practical product. 1 is a zigzag coil, 101 is a winding, 102 is a winding
end, 131, 132 is a lead wire of a conductor, 121 and 122 are a 45 degree fold for {180 degree
bending angle}, 123 and 124 are {90 degree It is a 90 degree crease of bending angle}.
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[0031]
FIG. 6 is an explanatory view of an embodiment of a method of magnetizing a magnetic circuit, in
which a magnetomotive force is applied to eight vertical magnetic poles, ie, four magnetic pole
pairs, of the 64 magnetic poles of FIG. The example in the case of magnetizing Y1 to Y8 of the X8
axis | shaft of the magnet of a circuit at once is shown. FIG. 6A is a top view of the magnetic pole.
FIG. 6 (b) is a view seen from the direction of the AA of the magnetic path, showing the
relationship between the {magnetic path and {the magnetomotive force generating portion for
magnetization}}. FIG. 6C is a view as seen from the B-B 'direction of the magnetic path, and shows
the relationship between the magnetic path and the magnetomotive force generating portion for
magnetization. As in FIG. 1, X1 to X8 indicate the coordinates of the horizontal axis. Y1 to Y8
indicate the coordinates of the vertical axis as in FIG.
[0032]
21 and 22 are the same numbered magnetic poles of FIG. Reference numerals 31, 32, and denote
the vertical magnetic paths of the same numbers in FIG. Reference numerals 311, 312, 321, 322,
331, 332, 341, 342 denote vertical magnetic paths respectively corresponding to {Y1 to Y8 axes}
of {X8 axes} in FIG. Reference numerals 211, 212, 221, 222, 231, 232, 241 and 242 denote
magnetic poles corresponding to {Y1 to Y8 axes} of {X8 axes} in FIG. 71, 72, 73, 74 are
magnetizing yokes. 81, 82, 83, 84 are magnetizing coils. The arrow of the magnetizing coil
indicates the direction of the current when magnetized in the {X8 axis}. The current direction in
the case of magnetizing the {X2 axis, X4 axis, X6 axis} is the same as the X8 axis. The current
direction in the case of magnetizing {X1 axis, X3 axis, X5 axis, X7 axis} is opposite to that of the
X8 axis.
[0033]
In the case of FIG. 4, the magnetizing process is performed 8 times in 4 pairs, but {36
magnetizations in 1 pair}, or {2 magnetizations in 16 pairs}, or It can be selected arbitrarily
according to the conditions of the magnetizing equipment and production efficiency, such as {36
pairs per magnetization}. The principle of magnetization is not the essence of the invention of the
present invention, so the description is omitted. The essence of the present invention is to
magnetize the perpendicular magnetic path and the magnetic pole assembled on the planar
magnetic path so that adjacent magnetic poles have opposite magnetic poles. The magnetic
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material to be magnetized is any one of {a magnetic pole, a perpendicular magnetic path, a planar
magnetic path} {any one type or any two types or all}. The best method is selected depending on
conditions such as required {magnetic flux density of magnetic gap, cost of assembled magnet,
size and shape of assembled magnet, strength of assembled magnet} and the like.
[0034]
X1, X2, X3, X4, X5, X6, X7, X8 Position of the horizontal axis in the drawing Y1, Y2, Y3, Y4, Y5,
Y6, Y7, Y8 Position of the vertical axis in the drawing 1 Zigzag coil 101 Start of winding 102
Winding End 1001 Winding direction 11, 13 and 15 Winding direction as seen from the drawing
12, 14 and 16 Winding direction opposite to front 21 and 24 S magnetic pole 22 and 23 N
magnetic pole 31, 32, 33 and 34 Vertical magnetic path 4 Horizontal magnetic paths 51, 52
Enlarged areas 201, 206, 208 N magnetic poles 202, 203, 204, 205, 207 S magnetic poles 306,
307, 308 Vertical magnetic path 110 Conductor with one conductor of a zigzag coil 111, 112,
113, 114, 115 Conductors 53, 54 Enlarged area 6 Latticed grooved voice coil diaphragm 61
Grooved 6 Groove cross section 131, 132 Conductor lead 121, 122 45 for 45 degree creases for
180 degree bend angle 123, 124 90 degree fold for 90 degree bend angle 311, 312, 321, 322 ,
331, 332, 341, 342 Perpendicular magnetic paths 211, 212, 221, 222, 231, 232, 241, 242
Magnetic poles 71, 72, 73, 74 Magnetizing yokes 81, 82, 83, 84 Currents for magnetizing coil
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