JP2005229224

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DESCRIPTION JP2005229224
PROBLEM TO BE SOLVED: To prevent breakage of a lead wire and to prevent generation of
distortion in reproduced sound due to a rolling phenomenon (rolling) in an oblong speaker
device. SOLUTION: A diaphragm 5 having an oval or elliptical outer periphery in plan view, an
oval or oval voice coil 8 for driving the diaphragm 5, and an edge 7 joined to the outer periphery
of the diaphragm 5. , And the frame 4 to which the outer peripheral edge of the edge 7 is fixed,
and the lead wires 13 and 14 drawn from the voice coil 8 have edge surfaces along the minor
axis direction of the diaphragm 5. It is laid out so as to make it traverse, and slack is given.
[Selected figure] Figure 3
Oval speaker device and method of manufacturing the same
[0001]
The present invention relates to an oval speaker device employing a diaphragm and a voice coil
whose outer peripheral shape in plan view is oval or elliptical, and a method of manufacturing
the same.
[0002]
In general, the electrodynamic speaker device comprises a diaphragm of a perfect circle, a voice
coil of a perfect circle driving the diaphragm, an edge joined to the outer periphery of the
diaphragm, and a frame to which the outer peripheral edge of this edge is fixed And a magnetic
circuit on the frame accommodating the voice coil, and a lead wire drawn from the voice coil.
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Then, the lead structure drawn out from the voice coil is wired so as to cross the diaphragm and
the edge in the radial direction along the surface of the diaphragm or the edge, and is drawn out
from the outer peripheral edge of the edge It has become.
[0003]
In such a lead wire wiring structure, when the surface of the diaphragm or edge is linearly laid
out, abnormal amplitudes such as chattering may be generated due to the amplitude of the
diaphragm and edge during operation, or lead wire The bending load and the tensile load come
to act repeatedly, which causes the lead wire to break. Then, the manufacturing method of the
speaker which slacks and is wired is proposed (for example, refer patent document 1).
[0004]
On the other hand, recently, an oval speaker device in which a diaphragm having an oval or
elliptical outer shape in plan view is adopted as a diaphragm has attracted attention as one of the
electrodynamic speaker devices. In this oval speaker device, the outer peripheral shape of the
diaphragm in plan view is an oval or an oval, and therefore, it is possible to make the space
narrow in width as compared with a general speaker device using a circular diaphragm. Not only
it is easy to install, it also has an advantage that the diaphragm area can be increased and the
low-range reproduction can be improved because the diaphragm extends in the major axis
direction. In addition, when the diaphragm is a dome-shaped diaphragm in which the center is
raised from the peripheral edge, there is no confinement of high-tone components as compared
to the case of a cone-shaped cone in which the center is recessed inward. Since the radiation
angle is wide, the directivity is weak, and there is also an advantage that the freedom of
arrangement to a device etc. is improved.
[0005]
That is, the oval speaker device is extremely useful as a high-performance micro speaker
mounted on a mobile phone or a portable audio device, and is earnestly studied.
[0006]
Even in such an oval speaker device, as described above, the lead wire is slackened and wired so
that the amplitude of the edge does not cause generation of abnormal noise such as clatter or
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disconnection of the lead wire. It is useful for preventing abnormal noise such as chattering and
breakage of lead wires.
[0007]
Japanese Examined Patent Publication No. 8-223687
[0008]
However, in the case of the oval speaker device, as described below, the weight balance of the
vibration system is broken due to the weight of the lead wire, and a rolling phenomenon (rolling)
occurs, which causes distortion in the reproduced sound. The problem arises.
[0009]
For example, FIG. 1 shows an example of the wiring structure of the lead wire in the oval-scar
apparatus.
The edge 53 is joined to the outer periphery of the diaphragm 51 whose outer peripheral shape
in plan view shown in FIG. 1 is an oval.
The voice coil 52 for driving the diaphragm 51 is mounted in a groove formed on the outer
periphery of the diaphragm 51.
The voice coil 52 and the lead wires 54 and 55 are drawn from the voice coil 52 on the minor
axis 56 of the oval and are laid along the major axis direction of the oval on the edge 53 to the
outer peripheral edge of the edge 53 It has been derived.
Then, by forming the bent portions 54a and 55a in the middle of the wires of the lead wires 54
and 55, a slack that allows the amplitude of the edge 53 is given.
[0010]
However, in the above-described oval speaker device, although the breakage of the lead wires 54
and 55 can be prevented by the slack due to the bending portions 54a and 55a, the edge 53
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connected to the outer periphery of the diaphragm 51 has a wide major axis direction In the case
where lead wires are laid along the major axis direction as described above, the weight balance of
the vibration system is broken by the weight of the lead wire, and The ring phenomenon (rolling)
tends to occur, and the rolling phenomenon causes a problem that distortion occurs in the
reproduced sound.
[0011]
As a problem to be solved by the present invention, in an oval speaker device adopting a
diaphragm and a voice coil whose outer peripheral shape in plan view is an oval or an oval, a
lead wire is prevented from being broken and a rolling phenomenon is caused. One example is
the solution to the problem that distortion occurs in the reproduced sound due to (rolling).
[0012]
The oval speaker device according to claim 1 has a diaphragm in which an outer peripheral
shape in plan view is an oval or an oval, an oval or an oval voice coil for driving the diaphragm,
and an outer periphery of the diaphragm. An oblong speaker device having an edge to be joined
and a frame to which an outer peripheral edge of the edge is fixed, wherein a lead wire drawn
from the voice coil is an edge along a minor axis of the diaphragm. It is characterized in that it is
laid out so as to cross the surface, and is provided with slack.
[0013]
The diaphragm according to claim 2 is characterized in that the lead wire drawn from the voice
coil is wired so as to cross the edge surface along the minor axis direction, and slack is given. .
[0014]
The voice coil according to claim 3 is characterized in that the drawn lead wire is wired so as to
cross the edge surface along the minor axis direction of the diaphragm, and slack is given. .
[0015]
According to a fourth aspect of the present invention, there is provided a method of
manufacturing an oval speaker device, comprising: a diaphragm having an oval or elliptical outer
peripheral shape in plan view; an oval or oval voice coil for driving the diaphragm; A method of
manufacturing an oblong speaker device, comprising: an edge joined to an outer periphery; and a
frame to which an outer peripheral edge of the edge is fixed, wherein the lead wire is the voice
coil attached to the dome-shaped diaphragm. The end of the lead wire is connected to the end of
the winding, and after drawing out from the voice coil, a predetermined slack is added and wired
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so as to cross the edge surface along the minor axis of the diaphragm. It is characterized by
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the oval speaker device
according to the present invention will be described below in detail with reference to the
drawings.
FIG. 2 is a longitudinal sectional view of a model oval speaker device according to an
embodiment of the present invention, FIG. 3 is a plan view showing a wiring structure of lead
wires in an oval speaker device according to an embodiment of the present invention, FIG. 5 is a
plan view showing a wiring structure of lead wires in the first modification, and FIG. 5 is a plan
view showing a wiring structure of lead wires in the second modification.
[0017]
In the oval speaker device 10 according to the embodiment of the present invention, as shown in
the sectional view of FIG. 1, a magnetic circuit having a ring-shaped magnetic gap is constituted
by the disc-shaped pole plate 1, the magnet 2 and the yoke 3. Be done.
The magnetic gap is an air gap in a portion where the side surface of the pole plate 1 and the
yoke 3 face each other, and has a substantially even spacing over the entire circumference.
Further, the frame 4 is integrally formed outside the yoke 3 constituting the magnetic circuit.
[0018]
Further, above the pole plate 1 of the magnetic circuit, a dome-shaped diaphragm 5 having an
oval outer peripheral edge is disposed.
A recess 6 having a U-shaped cross section is provided in a ring shape at the outer peripheral
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edge of the diaphragm 5 and an edge 7 is provided at the outer peripheral edge of the recess 6.
Further, an edge mounting frame 7a having a horizontal surface is provided at the outer
peripheral edge of the edge 7.
[0019]
The diaphragm 5, the recess 6, the edge 7, and the edge attachment frame 7a are integrally
formed by heat and pressure molding, for example, one resin film or the like.
[0020]
The edge 7 elastically supports the diaphragm 5 and the recess 6 together, and the edge
attachment frame 7 a is attached to the engaging portion 4 a provided on the frame 4.
The voice coil 8 formed by winding an electric wire around a voice coil bobbin of an elliptical
cross section (or without the voice coil bobbin) corresponding to the outer peripheral shape of
the diaphragm 5 is formed in the recess 6 by the adhesive 9. It is glued.
Accordingly, the voice coil 8 is disposed and suspended in the magnetic gap of the magnetic
circuit together with the recess 6 by the edge 7.
[0021]
As shown in FIG. 3, a pair of lead wires 13 and 14 connected to both ends of the wire of the voice
coil 8 are drawn from the recess 6 to the speaker surface side at both ends of the major axis 11
of the voice coil 8 respectively. It is led out to the outer peripheral edge of the edge 7 by making
the slack 13a and 14a of the following, and making it cross on the edge 7 along the minor axis
direction of the diaphragm 5.
[0022]
In the manufacturing process of the oval speaker device 10, when connecting the ends of the
pair of lead wires 13 and 14 to the voice coil 8, the end of the lead wire is tangential to the outer
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periphery of the winding of the voice coil 8. Connect the lead wires to face.
As a result, the lead wire from the voice coil 8 is tangential to the voice coil 8 at the outer
peripheral portion of the voice coil 8, and the connecting portion of the lead wire is a bent
portion causing stress concentration or the like. As a result, the durability against tension or the
like acting on the lead wire can be improved.
[0023]
In the above long-circle speaker device 10, the lead wires 13 and 14 drawn from the voice coil 8
are provided with the slacks 13a and 14a at the portions crossing the edge 7, thereby making the
amplitude of the edge 7 at the time of speaker operation The expansion and contraction of the
slacks 13a and 14a can be absorbed to prevent disconnection of the lead wires 13 and 14 caused
by the amplitude of the edge 7.
[0024]
The lead wires 13 and 14 are structured to cross the edge 7 along the minor axis direction where
the width is narrow compared to the major axis direction and bending deformation is unlikely to
occur, and the weight of the lead wires 13 and 14 is the diaphragm 5 or the edge Even if it acts
on 7, since the balance of weight balance + compliance of the vibration system is not easily
broken, the occurrence of rolling on the diaphragm 5 and the edge 7 is suppressed, and highquality reproduction with less distortion becomes possible.
[0025]
The lead-out positions of the lead wires 13 and 14 on the outer periphery of the voice coil 8 are
not limited to the major axis 11 shown in FIG.
For example, FIG. 4 shows a modification 1 of the present embodiment.
As shown in FIG. 4, the lead-out positions of the lead wires 13 and 14 are set on the minor axis
12 of the voice coil 8 connected to the outer periphery of the diaphragm 5, and the lead along
the minor axis from the lead-out position. The lead wires 13 and 14 may be wired so that the
wires 13 and 14 cross the edge 7.
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[0026]
Further, the outer peripheral shape of the diaphragm 5 and the edge 7 in plan view may be an
elliptical shape as in the second modification shown in FIG.
[0027]
In the above embodiment, an example of the structure in which the voice coil is disposed in the
concave portion opened on the front side of the speaker has been described. However, the abovedescribed embodiment such as a structure in which the voice coil is mounted on the back side of
the dome-shaped diaphragm It is needless to say that the invention is not limited to the abovedescribed embodiment, and various changes can be made without departing from the scope of
the invention.
[0028]
As described above in detail, the oval speaker device 10 according to this embodiment has the
diaphragm 5 having an oval or oval outer peripheral shape in plan view, and an oval or oval
voice coil for driving the diaphragm 5. 8, the edge 7 joined to the outer periphery of the
diaphragm 5, and the frame 4 to which the outer peripheral edge of the edge 7 is fixed, and the
lead wires 13 and 14 drawn from the voice coil 8 have the minor diameter of the diaphragm The
wiring is made so as to cross the edge surface along the direction, and since slack is given,
disconnection of the lead wires 13 and 14 is prevented, and the reproduced sound is distorted by
the rolling phenomenon (rolling). Can be prevented.
[0029]
It is explanatory drawing of an example of the wiring structure of the lead wire in an oval
speaker apparatus.
It is a longitudinal cross-sectional view of the ellipse speaker apparatus of embodiment which
concerns on this invention.
It is a top view which shows the wiring structure of the lead wire in the ellipse speaker apparatus
of embodiment which concerns on this invention.
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It is a top view which shows the wiring structure of the lead wire in the modification 1 of the
ellipse speaker apparatus of embodiment which concerns on this invention. It is a top view which
shows the wiring structure of the lead wire in the modification 2 of the ellipse speaker apparatus
of embodiment which concerns on this invention.
Explanation of sign
[0030]
REFERENCE SIGNS LIST 4 frame 5 diaphragm 6 recessed portion 7 edge 8 voice coil 10 oval
speaker device 13 14 lead wire 13 a, 14 a slack 11 major axis 12 minor axis
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