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JPH09163491

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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
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DESCRIPTION JPH09163491
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
elongated speaker for use in an audio device.
[0002]
2. Description of the Related Art The prior art will be described with reference to FIGS. 7 (a) to 7
(c). FIG. 7 is a block diagram of a conventional elongated speaker, FIG. 7 (a) is a plan view, FIG. 7
(b) is a sectional view in the major axis direction, and FIG. 7 (c) is a sectional view in the minor
axis direction. . In the figure, reference numeral 1 denotes an elongated diaphragm which
generates air vibration, and an edge 3 is joined to the outer peripheral portion thereof, and is
held by the frame 10 through the edge 3. A voice coil bobbin 6 is fixed to a central portion of the
diaphragm 1 and is vibratably held by the frame 10 via a damper 4.
[0003]
On the other hand, in the central recess of the frame 10, a magnetic circuit 11 comprising a yoke
7, a magnet 8 and a plate 9 is provided. Then, the voice coil 12 wound around the voice coil
bobbin 6 is held in the air gap of the magnetic circuit 11, and the voice coil bobbin 6 moves in a
piston by the drive current, and the diaphragm 1 vibrates in that direction. Sound waves are
emitted.
02-05-2019
1
[0004]
However, the above-mentioned conventional loudspeakers have the following problems. That is,
since the driving method of driving the central portion of the elongated diaphragm 1 (point
driving) is adopted, split resonance in the long axis direction is likely to occur. As a result, in the
middle and high frequencies, peaks and dips occur on the frequency characteristics of the
reproduced sound pressure, resulting in the deterioration of the sound quality. In addition, the
width of the drive system including the magnetic circuit 11 and the voice coil bobbin 6 becomes
smaller than the length of the short diameter of the speaker, and it is physically impossible to
make the aperture of the voice coil bobbin 6 large. Can not be too long.
[0005]
In addition, since the volume of the magnet 8 is also limited to a small size, the magnetic flux
density B of the air gap can not be sufficiently secured. As a result, the force coefficient (B × L)
of the drive system becomes small, making it difficult to increase the conversion efficiency.
[0006]
The present invention has been made in view of such conventional problems, and it is possible to
obtain a flat frequency characteristic in which split resonance does not easily occur and which
has a narrow width (elongated structure), and the conversion efficiency is enhanced. It is an
object of the present invention to obtain a speaker having an excellent sound quality, which can
reproduce a bass band by suppressing the frequency (f0) to a low level.
[0007]
The loudspeaker according to the present invention is a non-axisymmetric shape having a major
axis and a minor axis in plan view seen from the vibration direction, and at least a part of which
is a straight line parallel to each other in the major axis direction. A voice coil bobbin constituting
a part, a voice coil wound around the coil bobbin, a magnetic circuit for applying a magnetic flux
to the voice coil, and a slit provided in a straight portion of the voice coil bobbin wound around
the voice coil .
[0008]
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2
With this configuration, it is possible to prevent split resonance, flatten the frequency
characteristic, and improve the bass characteristic, and further suppress the change in shape of
the voice coil bobbin caused by the difference in thermal expansion coefficient between the voice
coil and the voice coil bobbin. is there.
[0009]
According to a first aspect of the present invention, there is provided a loudspeaker according to
a first aspect of the present invention, comprising: a non-axisymmetric diaphragm having a major
axis and a minor axis at least in plan view seen from the vibration direction; A bonded voice coil
bobbin, a voice coil wound around an outer peripheral surface of the voice coil bobbin, a
magnetic circuit for applying a magnetic flux for vibration to the voice coil, and a slit provided in
a voice coil winding portion of the voice coil bobbin Of the voice coil bobbin which is generated
by the difference in the thermal expansion coefficient of the voice coil and the voice coil bobbin.
It is possible to suppress the shape change.
[0010]
According to a second aspect of the present invention, there is provided a non-axisymmetric
diaphragm having at least a major axis and a minor axis in a plan view at least in a vibration
direction, a voice coil bobbin bonded to the diaphragm, and an outer periphery of the voice coil
bobbin. A voice coil wound around a surface, a magnetic circuit for applying a magnetic flux for
vibration to the voice coil, a box-shaped frame for housing the magnetic circuit, an outer
peripheral portion is connected to the frame, and an inner peripheral portion is The damper is
connected to the outer peripheral portion of the voice coil bobbin to hold the voice coil bobbin,
and can not only increase the rigidity of the voice coil but also prevent the occurrence of rolling.
Furthermore, since the damper is adhered to the entire circumference of the voice coil bobbin
and fixed to the frame, the damper can be softened, and since the corrugation can be made deep,
the linearity is improved.
[0011]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
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3
(First Embodiment) FIG. 1 is an exploded perspective view, FIG. 2 shows the structure of a voice
coil which is an essential part of the present invention, (a) is a plan view seen from the lower
side, (b) is It is a side view of a major axis direction.
In the figure, reference numeral 13 denotes a substantially track-type diaphragm which
generates air vibration, which is non-axisymmetric having a major axis direction and a minor axis
direction, and has a semi-cylindrical bulge in the vibration direction. .
The edge 15 is joined to the outer periphery of the diaphragm 13, and the outer periphery of the
edge 15 is held by the frame 22. The diaphragm 13 is also held by a damper 16 connected to the
frame 22 via a connecting member 17. Reference numeral 14 denotes a diaphragm reinforcing
paper provided on the back surface of the diaphragm 13.
[0012]
Further, a voice coil bobbin 18a having the same contour as the outer periphery of the
diaphragm 13 is fixed to the diaphragm 13, and a voice coil 19 is wound around the lower end.
The frame 22 is formed in a box shape, and the side surface thereof is bent in a rectangular
shape along the edge 15, and the bottom surface is in a rectangular shape. A yoke 21 and a
magnet 20 for forming a magnetic circuit are attached to the bottom of the frame 22. A voice coil
bobbin 18a is provided with a slit 18b, and the voice coil 19 is bonded to the voice coil bobbin
18a. Kraft paper, aluminum, resin or the like is used for the voice coil bobbin 18 a, and a copper
wire is mainly used for the voice coil 19.
[0013]
As described above, the voice coil bobbin 18a in which the voice coil 19 is wound using the
substantially track (longitudinal) diaphragm 13 and has the same long and narrow shape also
prevents split resonance, flattens frequency characteristics, and improves bass characteristics.
Further, since the slits 18b are provided in the winding portion of the voice coil 19 of the voice
coil bobbin 18a, deformation due to a difference in thermal expansion coefficient with the voice
coil bobbin 18a generated due to temperature rise of the voice coil 19 is prevented. The vibration
of the voice coil 19 can be correctly transmitted to the diaphragm 13, and the distortion of sound
can be reduced.
[0014]
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(Second Embodiment) FIG. 3 is an exploded perspective view, FIG. 4 shows the configuration of
the voice coil bobbin which is the main part, (a) is a plan view seen from the lower side, (b) is a
longitudinal direction It is a side view, FIG. 5 shows the structure of the voice coil bobbin which
is the principal part of an application example, (a) is the top view seen from lower side, (b) is a
side view of a major axis direction.
[0015]
In the description, the same parts as in Embodiment 1 will be assigned the same reference
numerals and explanations thereof will be omitted. The difference from Embodiment 1 is that the
outer periphery of voice coil bobbin 24 is replaced with damper 16 and connecting member 17.
The damper 23 is attached between the entire circumference and the frame 22.
The voice coil bobbin 24 is not provided with the slit 18 b like the voice coil bobbin 18 a of the
first embodiment.
[0016]
As described above, by providing the dampers 23 around the voice coil bobbins 24, the rigidity
of the voice coil bobbins 24 can be enhanced, and further, the dampers 23 are bonded to the
entire periphery of the voice coil bobbins 24 and fixed to the frame 22. Therefore, the degree of
flexibility of the damper 23 can be made softer, and the corrugation of the damper 23 can be
made deep, and the linearity is improved.
Furthermore, since the planar shape of the voice coil bobbin 24 seen from the vibration direction
is non-axisymmetric with a major axis and a minor axis, the distance from the center is
particularly long in the major axis direction, but the damper 23 is provided around the voice coil
bobbin 24. Since the dampers 23 are fixed to the frame 22, rolling can be prevented.
[0017]
5 (a) and 5 (b) are provided as dampers 25 at both ends of the voice coil bobbin 24 in the
longitudinal direction of the voice coil bobbin 24. The dampers 25 are also fixed to the frame 22
so that rolling can be prevented. It is possible.
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5
[0018]
(Third Embodiment) FIG. 6 is an exploded perspective view, and has features of the first
embodiment and the second embodiment.
[0019]
That is, the voice coil bobbin 18a is provided with the slit 18b similar to that of the first
embodiment, and the damper 23 similar to that of the second embodiment is provided (the
damper 16 and the connecting member 17 of the first embodiment are provided). Absent.).
[0020]
Therefore, in the third embodiment, the features of the first embodiment and the second
embodiment are combined, and the rigidity of the voice coil bobbin 18a can be enhanced by the
damper 23 provided on the outer periphery of the voice coil bobbin 18a. The slits 18b provided
in the voice coil bobbin 18a can suppress the deformation of the voice coil bobbin 18a even if
the temperature rises.
Furthermore, the occurrence of rolling can be suppressed, and the linearity can be improved.
[0021]
As described above, according to the present invention, in the case where the voice coil bobbin is
provided with the slit, it is possible to prevent split resonance, flatten the frequency characteristic
and improve the bass characteristic, and to increase the temperature rise of the voice coil. This
prevents deformation of the voice coil bobbin due to the vibration of the voice coil, correctly
transmits the vibration of the voice coil to the diaphragm, and makes it possible to reduce the
distortion of the sound.
[0022]
Brief description of the drawings
[0023]
1 is an exploded perspective view showing the structure of a speaker according to an
embodiment of the present invention
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6
[0024]
FIG. 2 (a) is a plan view showing the structure of the voice coil bobbin which is the main part of
FIG.
[0025]
3 is an exploded perspective view of the speaker according to the other embodiment
[0026]
FIG. 4 (a) is a plan view of the voice coil bobbin which is the main part
[0027]
FIG. 5 (a) is a plan view of a voice coil bobbin showing application of the embodiment of FIG.
[0028]
6 is an exploded perspective view of the other embodiment
[0029]
Fig.7 (a) The top view of the conventional speaker
[0030]
Explanation of sign
[0031]
13 diaphragm 16 damper 18a voice coil bobbin 18b slit 19 voice coil 20 magnet 21 yoke 22
frame 23 damper 24 voice coil bobbin 25 damper
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