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JP2009260624

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2009260624
The present invention provides a speaker diaphragm that is easy to manufacture and has high
sound reproducibility. A coil 3 is printed on a diaphragm 2 made of resin. [Selected figure] Figure
2
Speaker diaphragm
[0001]
The present invention relates to a diaphragm for a speaker that converts an electrical signal into
sound.
[0002]
2. Description of the Related Art In recent years, with the miniaturization of devices such as
mobile phones, the demand for downsizing and thinning of speakers and headphones used for
such devices has increased, and at the same time improvement in sound reproducibility has been
desired.
[0003]
In the conventional speaker, Lorentz force is applied to the charge flowing through the voice coil
by a cylindrical voice coil attached to the diaphragm with an adhesive and a magnet disposed at a
position corresponding to the inside of the voice coil. And vibrate the voice coil and the
diaphragm.
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1
In such a speaker, weight reduction is achieved in order to improve the electroacoustic efficiency.
However, although it is possible to reduce the weight of the diaphragm, the adhesive for
connecting the voice coil can not sufficiently reduce the mass of the vibration system, and it is
difficult to sufficiently improve the electroacoustic conversion efficiency. The
[0004]
In order to solve such a problem, for example, a voice coil is formed directly on the movable part
of the diaphragm having the movable part and the fixed part by a subtractive method, and the
thickness of the fixed part is thicker than the movable part. There is a plate (see Patent
Document 1). Here, the subtractive method refers to a method of removing unnecessary portions
by etching unnecessary conductive portions from a diaphragm in which metal foils are spread
over the entire surface, and leaving a coil. In such a diaphragm, since the voice coil is formed
directly on the diaphragm, an adhesive is not necessary, which makes it possible to reduce the
weight of the vibration system and to improve the reproducibility of sound.
[0005]
Unexamined-Japanese-Patent No. 11-88982 (paragraph number 0008-0009)
[0006]
However, although the technique of Patent Document 1 can reduce the weight of the vibration
system, since the voice coil is formed by the subtractive method, the manufacturing process
becomes complicated since it passes through many manufacturing processes.
In addition, the environmental load associated with manufacturing also becomes large due to the
generation of wastes due to etching and the like. Furthermore, since many steps are required to
form a voice coil by the subtractive method, it is difficult to easily prototype various voice coil
patterns.
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2
[0007]
An object of the present invention is to provide a speaker diaphragm that is easy to manufacture
and has high sound reproducibility in view of the above-mentioned actual situation.
[0008]
In order to solve the above problems, in the speaker diaphragm of the present invention, a coil is
printed on a resin-made diaphragm.
[0009]
In this configuration, a diaphragm is formed of a resin, and a voice coil is directly formed on the
surface of the diaphragm by a printing technique using metal foil or metal paste.
Therefore, since the adhesive is unnecessary, the weight of the vibration system can be reduced,
and the sound reproducibility can be improved.
Furthermore, since the voice coil is formed by the printing technology, the manufacturing
process is simple, wastes and the like involved in the manufacturing can be reduced, and there is
an advantage that trial manufacture of various voice coil patterns can be easily performed.
[0010]
In one of the preferred embodiments of the speaker diaphragm according to the present
invention, the coil has a meandering structure from one of the radial directions of the diaphragm
to the other, along the one radial direction. Adjacent parts are formed substantially in parallel.
[0011]
By making the shape of the coil, the coil can be disposed on the entire surface of the diaphragm
while having a simple wiring pattern, so the Lorentz force generated by the action of the
magnetic force when the current flows flows on the entire surface of the diaphragm. It works and
the reproducibility of the sound is enhanced.
[0012]
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Furthermore, in one of the preferred embodiments of the speaker diaphragm according to the
present invention, the coil has a plurality of arc-shaped portions having different radii, and ends
of the plurality of arc-shaped portions are connected to each other. It is a single coil connecting
one point around the diaphragm to the center.
[0013]
Even with such a coil shape, Lorentz force can be exerted on the entire diaphragm as in the case
of the above-described diaphragm, and sound reproducibility can be improved.
[0014]
Furthermore, in one of the preferred embodiments of the speaker diaphragm of the present
invention, the coils are formed on the front surface and the back surface of the diaphragm, and
the coil of the front surface and the back surface in the planar direction of the diaphragm The
coils overlap and the current directions of the overlapping coils are the same.
[0015]
By forming the coils in this manner, Lorentz forces in the same direction act on the front and
back coils, so that the amplitude of the diaphragm can be increased, and the sound
reproducibility can be improved.
[0016]
First Embodiment Hereinafter, a first embodiment of the electro-acoustic transducer of the
present invention will be described using the drawings.
FIG. 1 is a perspective view of the electro-acoustic transducer in this embodiment, FIG. 2 is a top
view, FIG. 3 is a cross-sectional view, and FIG. 4 is a bottom view.
The electroacoustic transducer of this embodiment has a diaphragm 2 inside the frame 1, and a
voice coil 3 is formed on the surface of the diaphragm 2 by metal foil.
In addition, a corrugation 4 is formed at the peripheral portion E of the diaphragm 2 to reinforce
the diaphragm 2 to provide flexibility and to suppress peaks and dips in frequency
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characteristics.
[0017]
The rod-like magnet 7 is supported by the yoke 8, and the yoke 8 is supported by the frame 1.
In addition, on the bottom surface, a vent hole 9 is provided, and an acoustic resistance cloth 10
is stretched.
The acoustic resistance is intended to be flattened by the acoustic resistance cloth 10.
[0018]
The diaphragm 2 is formed of polyethylene terephthalate (PET) resin or the like.
The central portion C other than the peripheral portion E where the corrugation 4 is formed is
laminated with a polyimide resin such as polyetherimide (PEI) having high heat resistance and
high rigidity. With such a configuration, the thickness of the peripheral part E of the diaphragm 2
becomes thinner than that of the central part C, and the whole of the diaphragm 2 becomes easy
to vibrate, the amplitude becomes large, and the reproducibility of the sound It contributes to the
improvement.
[0019]
The wiring pattern of the voice coil 3 in this embodiment has a meandering structure from one
radial direction of the diaphragm 2 to the other as shown in FIG. The parts to be arranged are
aligned so as to be substantially parallel. The voice coil 3 is directly formed by metal paste
printing (screen printing, offset printing, inkjet printing, etc.) technology represented by silver.
However, the metal used is not limited to silver, and other metals may be used.
[0020]
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The wiring pattern of the voice coil 3 can be manufactured by CAD and can be formed directly on
the surface of the diaphragm 2 based on the CAD data, so that various wiring patterns can be
easily prototyped. Moreover, in the conventional subtractive method, etc., etching and cleaning
are required, the manufacturing process is complicated, and high environmental load due to
generation of waste etc. is a problem. According to the present invention, such a problem It
becomes possible to solve the point.
[0021]
The action portion 5 in the present invention is a portion of the voice coil 3 that is largely
affected by the Lorentz force, and in the case of the wiring pattern of FIG. 2, the linear portion of
the voice coil 3 aligned substantially parallel is the action portion It will be 5. A voice coil 3
(dotted line portion in FIG. 2) having the same shape is also formed on the back surface of the
diaphragm, and is connected to the surface through the through hole 11. In the present
embodiment, the voice coil 3 is formed on both sides of the diaphragm 2. However, the voice coil
3 may be formed on only one side.
[0022]
Here, referring to FIG. 3, as is apparent from the drawing, the bar-like magnet 7 is disposed at a
position corresponding to the gap 6 of the wiring pattern of the voice coil 3 of the present
embodiment. As shown in FIG. 5, the rod-like magnet 7 has magnetic poles in the vertical
direction with respect to the surface to be disposed. Therefore, the current direction of the action
unit 5 and the magnetic force direction from the magnet 7 are orthogonal to each other, and
Lorentz force acts on the charge flowing through the action unit 5. In the present embodiment,
although the rod-like magnet 7 shown in FIG. 5 is used, it is also possible to use a multipolar
magnet on a plane magnetized in stripes. In this case, it is more advantageous to use a rod-like
magnet because the magnetic force is weakened by the cancellation of the magnetic force.
Moreover, the number of linear parts of the voice coil 3 functioning as the action part 5 can be
changed as appropriate, and accordingly, the number of rod-like magnets 7 can also be changed.
[0023]
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Next, the operation principle of the electroacoustic transducer of the present embodiment will be
described using FIGS. 6 and 7. Hereinafter, in the figure, the symbol x indicates the action part 5
in which current flows from the front to the back with respect to the paper, and the mark ●
indicates the action part 5 in which current flows from the back to the paper with respect to the
paper. I assume. It can be seen from FIG. 6 that the current directions flowing in the adjacent
action parts 5 are different from each other. When current flows in the direction of (a) in FIG. 2,
current flows from the front to the back with respect to the action parts 5a, 5c and 5e, and in the
action parts 5b, 5d and 5f, from the back to the front A current will flow. At this time, a
downward Lorentz force (arrow in FIG. 6) acts on each action portion 5, and accordingly, the
diaphragm 2 is also subjected to a force in the same direction.
[0024]
On the other hand, FIG. 7 is a figure at the time of supplying an electric current to (b) direction of
FIG. In this case, current flows from the back to the front direction in the action parts 5a, 5c, 5e,
and current flows from the front to the back direction in the action parts 5b, 5d, 5f. However,
since the direction of the magnetic force is the same as that in FIG. 6, the Lorentz force that acts
is the upward direction opposite to that in FIG. 6 (arrow in FIG. 7). Accordingly, along with that,
the diaphragm 2 also receives an upward force.
[0025]
Second Embodiment Next, a second embodiment of the electro-acoustic transducer of the present
invention will be described. FIG. 8 is a top view of the electro-acoustic transducer in the second
embodiment, FIG. 9 is a cross-sectional view, and FIG. 10 is a bottom view. The present
embodiment differs from the first embodiment in the wiring pattern of the voice coil 3 and the
magnet 7.
[0026]
In the wiring pattern of the voice coil 3 in the second embodiment, as shown in FIG. 8, the voice
coil 3 has a plurality of arc-shaped portions, and the end portions of the plurality of arc-shaped
portions are connected to each other. In such a wiring pattern, the plurality of arc-shaped
portions function as the acting portion 5. In the present embodiment, as in the first embodiment,
the voice coil 3 is formed at the central portion C of the diaphragm 2 by the metal paste printing
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technique, and the voice of the surface of the diaphragm 2 is formed through the through holes
11. The coil 3 and the voice coil 3 on the back surface are connected.
[0027]
In the wiring pattern of the voice coil 3 of the present embodiment, as described above, the
action portion 5 is formed of five concentric circular arcs. Therefore, two doughnut-shaped
multipolar magnetized magnets 7a and 7b as shown in FIG. As shown in FIG. 11, each of the
multipolar magnetized magnets 7a and 7b has three magnetic poles in the radial direction, and
the magnetic poles are reversed to each other. In the present embodiment, two multipolar
magnetized magnets 7a and 7b are used, but the present invention is not limited to this. For
example, one multipolar magnetized magnet may be used, and it is also possible to use a toroidal
magnet having different magnetic poles in the vertical direction with respect to the surface to be
disposed. In the latter case, six donut shaped magnets 7 are required to correspond to the
pattern of the voice coil 3 of FIG. Here, the number of arcs of the voice coil 3 formed
concentrically can be changed as appropriate, and the magnetic pole characteristics and the like
of the magnet 7 used can be changed accordingly.
[0028]
12 and 13 are schematic views showing the operation principle of the electro-acoustic
transducer of the second embodiment. FIG. 12 shows the current direction, the magnetic force
direction, and the Lorentz force direction of each action portion 5 when a current is supplied in
the direction of (c) of FIG. In this case, a downward Lorentz force acts on each action portion 5.
On the other hand, FIG. 13 shows the directions of the current, the magnetic force and the
Lorentz force when the current in the direction of (d) of FIG. 8 flows, and the upward force acts
on each action portion 5 I understand.
[0029]
As described above, according to the electro-acoustic transducer of the present invention, the
Lorentz force due to the magnetic force acts on the voice coil formed over substantially the entire
surface of the central portion of the diaphragm to vibrate the entire diaphragm. Can.
Furthermore, since the peripheral portion of the diaphragm is formed thinner than the central
portion, the diaphragm is easily vibrated, and the amplitude of the diaphragm can be increased.
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As a result, the peaks and dips are reduced and the sound reproducibility is improved.
[0030]
In the above-described embodiment, the magnet is disposed on one side of the diaphragm, but in
actual use, the magnets are disposed on both sides of the diaphragm in order to enhance the
acoustic conversion efficiency.
[0031]
A perspective view of a first embodiment of a loudspeaker using a diaphragm according to the
invention A top view of a first embodiment of a loudspeaker using a diaphragm according to the
invention A cross section of a first embodiment of a loudspeaker using a diaphragm according to
the invention Bottom view of the first embodiment of the loudspeaker using the diaphragm
according to the present invention The figure showing the magnet used in the first embodiment
of the loudspeaker using the diaphragm according to the present invention The first of the
loudspeaker using the diaphragm according to the present invention The schematic diagram
showing the principle of operation of the embodiment The schematic diagram showing the
principle of operation of the first embodiment of the speaker using the diaphragm according to
the present invention The top view of the second embodiment of the speaker using the
diaphragm according to the present invention Sectional view of the second embodiment of the
loudspeaker using the diaphragm Bottom view of the first embodiment of the loudspeaker using
the diaphragm according to the present invention The magnet used in the second embodiment of
the loudspeaker using the diaphragm according to the present invention Schematic diagram
illustrating the operation principle of the second embodiment of the loudspeaker using the
diaphragm according to schematic diagram present invention showing the operation principle of
the second embodiment of the loudspeaker using the diaphragm according to the invention
Explanation of sign
[0032]
1: Frame 2: Diaphragm 3: Voice coil 4: Corrugation 5: Active part 6: Gap part 7: Magnet 8: Yoke
9: Air vent 10: Cross for acoustic resistance 11: Through hole C: Central part E: Peripheral part
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