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JP2006303778

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DESCRIPTION JP2006303778
An eccentric speaker device having an eccentric main diaphragm, and a speaker device capable
of improving disturbance of frequency characteristics in a wide band even when an auxiliary
diaphragm is provided. An eccentric speaker device 31 receives a vibration from a voice coil 15
driven by a magnetic circuit 20 to reproduce sound and a main diaphragm 1B eccentric to the
center of the voice coil 15, and a main vibration. It is provided extending in the sound radiation
direction from the central portion of the plate 1B, and reproduces the sound of the area that
supplements the main diaphragm 1B, and has a sub-diaphragm 3B eccentric to the center of the
voice coil 15. [Selected figure] Figure 1
Eccentric speaker device
[0001]
The present invention relates to an eccentric speaker device having an eccentric diaphragm in
which a central axis is eccentric to a center of a voice coil.
[0002]
With regard to the problem that the characteristics deteriorate due to the divided resonance of
the diaphragm, conventionally, the shape of the diaphragm is not coaxial with the voice coil, or
the right cone is cut at an oblique plane not perpendicular to the axis There has been proposed
an eccentric speaker device equipped with a so-called eccentric diaphragm (eccentric cone)
which is shaped or shaped.
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1
In the eccentric speaker device having such a feature, since the distance from the voice coil to
the periphery of the diaphragm is uneven, split resonance at the natural frequency does not
occur, and degradation of reproduction sound quality can be resolved. (See, for example, Patent
Document 1).
[0003]
On the other hand, conventionally, there has been proposed a speaker device in which a
secondary diaphragm (sub cone) is provided to achieve a wide band. Among them, a full band
type speaker device called a so-called full range speaker has many excellent points. In this fullband speaker device, since all the sound is emitted from the same sound source, the fundamental
sound and the overtone of the same sound or musical instrument sound are separately emitted
from the speakers at different positions divided for each frequency. It is possible to completely
eliminate the instability of the sound field localization at the time of stereo reproduction due to
the unnaturalness of coming, the characteristic near the crossover frequency and the disturbance
of the phase (for example, see Patent Document 2).
[0004]
JP, 2000-354289, A JP, 2001-346284, A
[0005]
However, in the above-described eccentric speaker device, in the case where an auxiliary
diaphragm is provided in an attempt to widen the bandwidth, resonance may occur in a high
frequency band reproduced by the auxiliary diaphragm to cause disturbance in frequency
characteristics.
[0006]
The present invention has been made to solve the above-described problems, and in an eccentric
speaker device having a main diaphragm in which the central axis is eccentric, resonance occurs
in a high frequency band even when a sub diaphragm is provided. It is an object of the present
invention to provide a speaker device which can improve the disturbance of the frequency
characteristic in a wide band without the noise.
[0007]
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2
In order to solve the problems described above and achieve the object, the speaker device
according to the present invention receives vibration from a voice coil driven by a magnetic
circuit to reproduce sound and is eccentric with respect to the center of the voice coil. In the
speaker device having the main diaphragm, the sound emission direction is provided extending
from the central portion of the main diaphragm to reproduce the sound of the area compensating
the main diaphragm and to be decentered with respect to the center of the voice coil. And an
auxiliary diaphragm.
[0008]
Here, with the main diaphragm which is eccentric to the center of the voice coil, the shape of the
diaphragm is a shape which is not coaxial with the voice coil or a straight cone is cut at an
oblique plane which is not orthogonal to the axis It refers to a so-called eccentric diaphragm
which is shaped or includes all diaphragms whose central axes are offset with respect to the
center of a circle or ellipse formed by the outer peripheral edge of the diaphragm.
[0009]
Hereinafter, embodiments of the speaker device according to the present invention will be
described in detail.
The present invention is not limited by the embodiment.
In the following, the outline and features of the speaker device of the present invention will be
described as an embodiment, and then an example of the speaker device will be described.
[0010]
Embodiment An eccentric speaker device according to the present embodiment includes a main
diaphragm that receives vibration transmitted from a voice coil driven by a magnetic circuit to
reproduce sound and is eccentric with respect to the center of the voice coil, and It is provided
extending in the sound radiation direction from the central portion of the diaphragm, and
reproduces the sound of the area that supplements the main diaphragm, and has an auxiliary
diaphragm that is eccentric to the center of the voice coil.
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Therefore, in the case of an eccentric speaker device having a main diaphragm in which the
central axis is eccentric, for example, even when the auxiliary diaphragm is provided for the
purpose of achieving a wider band, both the main diaphragm and the auxiliary diaphragm are
with respect to the central axis. The shape is asymmetric, and in addition to the resonance
dispersion effect of the main diaphragm, the resonance dispersion effect in a high frequency
region by the sub diaphragm is also added, and the disturbance of the frequency characteristic
can be improved in a wide band.
[0011]
In addition, since the eccentric speaker device of the present embodiment is provided to close the
hole in the central portion of the sub-diaphragm, and further has a center cap for reproducing
the sound in the area that supplements the main diaphragm, the band is further broadened. Since
the center cap is also decentered with respect to the center of the voice coil, the resonance
dispersion effect in the high frequency region is further added, and the disturbance of the
frequency characteristic can be further improved in a wide band.
In addition, since the main diaphragm and the sub diaphragm are decentered so that the
directivity is inclined in the same direction, the directivity of the speaker device can be largely
inclined.
Furthermore, the directivity may be further greatly inclined by making the eccentric direction of
the center cap coincide with the eccentric direction of the main diaphragm and the sub
diaphragm. Thus, for example, when it is desired to radiate sound in a direction inclined with
respect to the mounting surface of the speaker device, as in the case of installing the speaker
device in a cabin of a vehicle, the sound is transmitted in a sharp direction with respect to the
mounting surface It can be emitted. On the contrary, the inclination of directivity can be reduced
by making the directions of eccentricity different from each other.
[0012]
The eccentricity of the main diaphragm and the auxiliary diaphragm is not limited to matching
the directions as described above, but a combination of both eccentric vectors (the direction and
the size of the eccentricity) is a desired direction and size. It may be Thereby, the directivity of
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the speaker device can be controlled. Not only the main diaphragm and the sub-diaphragm, but
also the center cap may be made to have a desired direction and size by combining three
eccentric vectors. By adjusting the mutual eccentricity vectors, the pointing direction can be
directed in any direction. That is, the pointing direction can be freely controlled.
[0013]
Furthermore, in more detail, since the three diaphragms of the main diaphragm, the sub
diaphragm, and the center cap are different in the frequency band of the sound to be reproduced,
that is, the sub diaphragm is a region of a frequency band higher than the main diaphragm.
Because the frequency range of the sound to be reproduced is different, such as the frequency
range of the center cap that is higher than that of the auxiliary diaphragm, the directivity
characteristics of each frequency range can be controlled by adjusting the amount of eccentricity.
it can.
[0014]
Further, in the eccentric speaker device of the present embodiment, the auxiliary diaphragm and
the center cap are integrally formed.
Therefore, the timbre of the sound to be reproduced is unified, and together with the
improvement of the deterioration of the characteristics due to the split resonance, the sense of
reality can be improved. Hereinafter, preferred embodiments of the present invention will be
described with reference to the drawings.
[0015]
First Embodiment FIG. 1 is a cross-sectional view of an eccentric speaker device having an
eccentric main cone according to a first embodiment, and an integrally formed eccentric subcone and a center cap provided in the eccentric speaker device. In FIG. 1, a cone type speaker
device 31 of this embodiment is a vibration comprising a main cone 1B which is an eccentric
main diaphragm, a sub cone 3B which is an eccentric auxiliary diaphragm, a center cap 2A, a
voice coil bobbin 17 and a voice coil 15. The magnetic circuit 20 has a structure and a yoke 13, a
magnet 11 and a top plate 12.
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[0016]
A top plate 12 and a yoke 13 made of a magnetic material such as iron are attached to the front
and back sides of the ring-shaped magnet 11. A center pole 14 integrated with the yoke 13 is
disposed in the center of the front surface of the yoke 13. A magnetic gap g is formed between
the outer peripheral surface of the center pole 14 and the inner peripheral surface of the top
plate 12. That is, the magnet 11, the top plate 12, the yoke 13 and the center pole 14 constitute
a magnetic circuit 20 forming a magnetic gap g between the outer peripheral surface of the
center pole 14 and the inner peripheral surface of the top plate 12. A frame 16 is attached to the
front of the top plate 12.
[0017]
Furthermore, on the opposite side to the magnet 11 which is the front of the top plate 12, a
substantially eccentric trumpet-shaped main cone 1B which is a main diaphragm is disposed with
the large diameter portion forward in the sound radiation direction (forward). It is set up. The
central axis of the main cone 1B is eccentric to the central axis O of the magnetic circuit 20 and
the voice coil 15 by a distance E. A substantially eccentric trumpet-shaped sub cone 3B is
disposed with its large diameter portion facing forward so as to extend in the forward direction
from the central hole of the main cone 1B. The sub cone 3B has a conical small diameter portion
connected to the small diameter portion of the main cone 1B, and the opposite large diameter
portion extends to the middle portion of the main cone 1B. The sub cone 3B vibrates together
with the main cone 1B, and reproduces a high-band sound that can not be reproduced by the
main cone 1B. The central axis of the sub cone 3B is offset from the central axis O of the
magnetic circuit 20 and the voice coil 15 by a distance F.
[0018]
A small diameter dome-shaped center cap 2A is provided to close the hole in the central portion
of the sub cone 3B. The sub-cone 3B and the center cap 2A are integrally molded and made of
either the same material as paper or fiber. The central axis of the center cap 2A coincides with
the central axis O. The center cap 2A vibrates together with the main cone 1B in the same
manner as the sub cone 3B, and reproduces a higher-band sound that can not be reproduced by
the main cone 1B or the sub cone 3B. The center cap 2A also contributes to dustproofing of the
inside of the speaker device 31 and improvement of the rigidity of the central portion of the
main cone 1B.
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[0019]
Furthermore, a cylindrical voice coil bobbin 17 is disposed with its central axis aligned with the
main cone 1B and the center cap 2A. The voice coil bobbin 17 is supported from the frame 16 by
an elastic spider 18 so as to be movable back and forth along the central axis. A center cap 2A
molded integrally with the sub-cone 3B is connected to and supported by the voice coil bobbin
17 at the peripheral edge portion. The main cone 1B is supported by fixing the circular
peripheral edge of the conical large diameter portion to the outer peripheral edge of the frame
16 and connecting the conical small diameter portion to the sub cone 3B.
[0020]
The voice coil 15 is wound around the outer peripheral surface of the voice coil bobbin 17. The
voice coil bobbin 17 is disposed such that the voice coil 15 is positioned at a predetermined
position in the gap g.
[0021]
In the eccentric speaker device 31 having such a configuration, the sub cone 3B is eccentric to
the central axis O by the distance F. With this configuration, in an eccentric speaker device
having a main cone 1B whose central axis is eccentric, resonance does not occur in a high
frequency band even when the sub cone 3B is provided, for example, for the purpose of
achieving a wide band. In addition to the resonance dispersion effect of the main cone 1B, the
resonance dispersion effect in the high frequency region by the sub cone 3B is also added, and
the disturbance of the frequency characteristic can be improved in a wide band.
[0022]
Since the main cone 1B and the sub cone 3B are eccentric, the pointing direction of the eccentric
speaker device 31 can be largely inclined. The inclination of the directivity can be reduced by
making the directions of the eccentricity of the main cone 1B and the sub cone 3B different from
each other, contrary to that of the present embodiment. Moreover, inclination can also be
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eliminated by mutually adjusting. Furthermore, by adjusting the vectors (the direction and the
magnitude of the eccentricity) of mutual eccentricity of the main cone 1B and the sub cone 3B, it
is possible to turn the pointing direction in any direction. That is, the pointing direction can be
freely controlled. Since the sub cone 3B and the center cap 2A are integrally formed, the timbre
of the sound to be reproduced is unified, and it is possible to improve the sense of presence
coupled with the improvement of the deterioration of the characteristics due to the split
resonance.
[0023]
Second Embodiment FIG. 2 is a cross-sectional view of an eccentric speaker device having an
eccentric main cone according to a second embodiment and an integrally formed eccentric subcone and an eccentric center cap provided in the eccentric speaker device. In FIG. 2, in the
eccentric speaker device 32 of the present embodiment, the central axis of the main cone 1B is
eccentric to the central axis O of the magnetic circuit 20 and the voice coil 15 by a distance E.
The central axis of the sub cone 3B is eccentric to the central axis O by a distance F. The central
axis of the center cap 2B is eccentric to the central axis O by a distance D. The sub cone 3B and
the center cap 2B are integrally formed of the same material and manufactured.
[0024]
In the eccentric speaker device 32 of the present embodiment, since the main cone 1B, the sub
cone 3B and the center cap 2B are both eccentric, it is possible to further reduce the
deterioration of the characteristics due to the split resonance.
[0025]
Furthermore, in the eccentric speaker device 32 of this embodiment, the directivity of the main
cone 1B, the sub cone 3B, and the center cap 2B is eccentrically inclined in the same direction, so
that the directivity direction of the speaker device 36 is largely inclined. Can.
The inclination of directivity can be reduced by making the directions of eccentricity of the main
cone 1B, the sub cone 3B and the center cap 2B different from each other, contrary to those of
this embodiment. In addition, the inclination can be eliminated by adjusting the mutual
eccentricity. Furthermore, the directivity direction can be directed in any direction by adjusting
the vectors of mutual eccentricity of the main cone 1B, the sub cone 3B and the center cap 2B.
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8
That is, the pointing direction can be freely controlled.
[0026]
Furthermore, in more detail, since the three diaphragms of the main cone 1B, the sub cone 3B
and the center cap 2B are different in the frequency band of the sound to be reproduced, that is,
the sub cone 3B is a region of the frequency band higher than the main cone 1B. Since the
frequency band of the sound to be reproduced is different, as in the region of the frequency band
higher than that of the sub cone 3B, the center cap 2B controls the directivity characteristics of
each frequency band by adjusting the amount of eccentricity. You can also.
[0027]
In addition, although the shape of the center cap 2B of a present Example is a convex shape with
respect to the radiation | emission direction of an acoustic, even if it is a concave shape with
respect to the radiation | emission direction of an acoustic, the same effect may be acquired. Can.
[0028]
Fourth Embodiment FIG. 3 is a cross-sectional view of an eccentric speaker device having an
eccentric main cone according to a third embodiment.
In the eccentric speaker device 34 of this embodiment, no center cap is provided as compared
with that of the first embodiment.
The other points are the same as those of the first embodiment. As a result, although the sound
band reproduced by the center cap is eliminated, an effect substantially similar to that of the first
embodiment can be obtained except for this point.
[0029]
(Fourth Embodiment) FIG. 4 is a cross-sectional view of an eccentric speaker device having a
bending type eccentric main cone of a fourth embodiment and an integrally formed eccentric
sub-cone and a center cap which are equipped in the eccentric speaker device. The main cones of
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Examples 1 to 3 described above were all roughly trumpet-shaped diaphragms, but as in the
present embodiment, the main cones have a shape in which the trumpet-shaped cone is bent in
the middle of the radial direction The same effect can be obtained even with
[0030]
In FIG. 4, in the eccentric speaker device 34 of this embodiment, the central axis of the main cone
4B is eccentric to the central axis O of the magnetic circuit 20 and the voice coil 15 by the
distance E. The central axis of the sub cone 3B is eccentric to the central axis O by a distance F.
The sub cone 3B and the center cap 2A are integrally molded and manufactured.
[0031]
In the present embodiment, the main cone 4B and the sub cone 3B are decentered so that the
directivity is inclined in the same direction. According to this configuration, substantially the
same effect as that of the first embodiment can be obtained.
[0032]
(Fifth Embodiment) FIG. 5 is a cross-sectional view of an eccentric speaker device having a
bending type eccentric main cone according to a fifth embodiment, and an integrally formed
eccentric sub-cone and an eccentric center cap provided on the eccentric speaker device. In FIG.
5, in the eccentric speaker device 35 of the present embodiment, the central axis of the main
cone 4B is eccentric to the central axis O of the magnetic circuit 20 and the voice coil 15 by the
distance E. The central axis of the sub cone 3B is eccentric to the central axis O by a distance F.
The central axis of the center cap 2B is eccentric to the central axis O by a distance D. The sub
cone 3B and the center cap 2B are integrally molded and manufactured.
[0033]
Furthermore, in the speaker device 35 according to the present embodiment, the directivity of
the main cone 4B, the sub cone 3B and the center cap 2B is eccentrically inclined in the same
direction, so that the directivity direction of the speaker device 35 can be greatly inclined. it can.
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The inclination of directivity can be reduced by making the directions of eccentricity of the main
cone 4B, the sub cone 3B, and the center cap 2B different from each other, contrary to that of the
present embodiment. In addition, the inclination can be eliminated by adjusting the mutual
eccentricity. Furthermore, the directivity direction can be directed in any direction by adjusting
the mutual eccentricity vectors of the main cone 4B, the sub cone 3B and the center cap 2B. That
is, the pointing direction can be freely controlled.
[0034]
In addition, although the shape of the center cap 2B of a present Example is a convex shape with
respect to the radiation | emission direction of an acoustic, even if it is a concave shape with
respect to the radiation | emission direction of an acoustic, the same effect may be acquired. Can.
[0035]
Sixth Embodiment FIG. 6 is a cross-sectional view of an eccentric speaker device having a
bending type eccentric main cone of a sixth embodiment.
In the eccentric speaker device 36 of this embodiment, no center cap is provided as compared
with that of the fourth embodiment. The other points are the same as those of the fourth
embodiment. As a result, although the sound band reproduced by the center cap is eliminated, an
effect substantially similar to that of the fourth embodiment can be obtained except for this
point.
[0036]
By being provided with an eccentric diaphragm in which the central axis is eccentric with respect
to the center of the voice coil, the present invention is suitably applied to a speaker device in
which frequency characteristics deterioration due to split resonance is suppressed and directivity
is controlled. In particular, it is suitably applied to an on-vehicle speaker device installed in a
passenger compartment of a vehicle.
[0037]
FIG. 1 is a cross-sectional view of an eccentric speaker device having an eccentric main cone of
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11
Example 1 and an integrally formed eccentric sub-cone and a center cap provided in the
eccentric speaker device.
It is a cross-sectional view of the eccentric speaker apparatus which has an eccentric main cone
of Example 2, and the integrally formed eccentric sub cone and eccentric center cap which are
equipped in this eccentric speaker apparatus. FIG. 10 is a cross-sectional view of an eccentric
speaker device having an eccentric main cone according to a third embodiment. It is a crosssectional view of the eccentric speaker apparatus which has the bending-type eccentric main
cone of Example 4, and the integrally molded eccentric sub cone and center cap which are
equipped with this eccentric speaker apparatus. It is a cross-sectional view of the eccentric
speaker apparatus which has a bending type | mold eccentric main cone of Example 5, and the
integrally formed eccentric sub cone and eccentric center cap which are equipped with this
eccentric speaker apparatus. FIG. 16 is a cross-sectional view of an eccentric speaker device
having a bending type eccentric main cone of a sixth embodiment.
Explanation of sign
[0038]
1B Eccentric main cone (main diaphragm) 2A Uncentered center cap 2B Eccentric center cap 3B
Eccentric sub-cone (sub diaphragm) 4B Eccentric bending main cone (main diaphragm) 11
Magnet 12 Top top plate 13 Yoke 14 Center pole 15 Voice coil 16 Frame 17 Voice coil bobbin
18 Spider O Magnetic circuit and central axis of voice coil g Magnetic gap
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