JP2006080819

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DESCRIPTION JP2006080819
The present invention relates to a speaker used for various audio devices, and it is an object of
the present invention to suppress auditory distortion and clip sound. A speaker according to the
present invention makes an edge 10A cross-sectional shape an ellipse, inclines the central axis of
the ellipse, and sets the inner diameter of the edge to the minor diameter side of the ellipse, and
between the edge center and the outer diameter of the ellipse. The voice coil 6 remains in the
magnetic circuit 1 and the braking force is sufficiently generated at a small amplitude where the
voice coil 6 is separated from the magnetic circuit 1 to reduce the braking force. In the case of
large amplitude, the movement is gradually suppressed to suppress distortion and clipping.
[Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used for various audio devices.
[0002]
In a speaker, the edge supports a cone body (diaphragm) and a vibrating part, and usually there
is no large change in flexibility during amplitude.
However, some speakers require an edge that is soft with small amplitude and that becomes
harder as the amplitude increases. This is because the voice coil stays in the magnetic circuit and
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the braking force is sufficiently generated at small amplitudes, while the voice coil is removed
from the magnetic circuit and the braking force is reduced at large amplitudes. The purpose is to
improve the sense of distortion, sound pressure, and volume of bass. FIG. 3 (a) is a cross-sectional
view of this type of speaker, and FIG. 3 (b) is an enlarged view of an edge portion which is a main
part.
[0003]
According to the drawing, reference numeral 1 denotes a magnetic circuit, which comprises a top
plate 3, a magnet 4 and a yoke 5. 6 is a voice coil, 7 is a damper for supporting the voice coil 6, 8
is a dust cap, 9 is a cone body (diaphragm), 10 is an edge fixed to the outer periphery of the cone
body 9, 2 is an edge outer periphery fixed Frame. R1 is the radius of the inner circumferential
cross section of the edge 10, R2 is the radius of the outer circumferential cross section of the
edge 10, and the cross section of the edge 10 is constituted by the inner large radius R1 and the
outer small radius R2. Since the inner side of the edge 10 is originally smaller in area than the
outer side and made of less material, it has a relatively high degree of flexibility. By combining a
large R1 here, the degree of flexibility is greatly increased. The outside of the edge 10 is
reversed, and the relative flexibility is reduced due to the combination of small R2 with many
construction materials. Therefore, with small amplitude, the inside of the highly flexible edge 10
is easily displaced, and when the displacement is shifted to the outside with low flexibility, the
amplitude is suppressed.
[0004]
In addition, as a prior art document regarding this above-mentioned speaker, patent document 1
is known, for example. JP-A-8-79885
[0005]
However, in the conventional example as described above, since the edge cross section is formed
with a concentrated constant of R1 and R2, the change in compliance is small mainly while R1 is
displaced, and a sudden change occurs when the displacement shifts to R2. Tends to For this
reason, there were problems such as insufficient effect of amplitude control and occurrence of
clipping sound due to sudden control. Although Patent Document 1 proposes a speaker edge in
which at least two roll portions are provided on the inner and outer circumferences and the inner
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circumferential side is larger than the outer circumferential side, the edge becomes large, and in
the speaker miniaturization request, Adoption has been limited due to the enlargement of the
speaker and the reduction of the effective area of vibration.
[0006]
In order to solve the above problems, the speaker of the present invention makes the shape of
the cross section of the edge an ellipse, and by tilting the central axis of the above-mentioned
ellipse, It comprises using the diaphragm which set the major-diameter side of the said ellipse
between.
[0007]
As a result, the voice coil stays in the magnetic circuit and the braking force is sufficiently
generated at small amplitudes, while the voice coil is removed from the magnetic circuit and the
braking force decreases at large amplitudes. This makes it possible to provide an excellent
speaker that solves the problem of lack of effects and sudden generation of clip sound due to
control.
[0008]
As described above, in the speaker according to the present invention, the voice coil remains in
the magnetic circuit and the movement is increased at a small amplitude where the braking force
is sufficiently generated, and the voice coil is removed from the magnetic circuit and the
movement is gradually increased at a large amplitude where the braking force decreases. Thus, it
is possible to provide a high-performance speaker capable of suppressing distortion in the sense
of hearing, sound pressure, and volume of bass.
[0009]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the description, the same parts as in the prior art will be assigned the same reference
numerals and explanations thereof will be omitted.
[0010]
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(Embodiment 1) FIG. 1 (a) is a side sectional view of a speaker showing an embodiment of a
speaker according to the present invention, and FIG. 1 (b) is an enlarged sectional view of an
edge which is the main part.
According to the figure, 1 is a magnetic circuit and is composed of a top plate 3, a magnet 4 and
a yoke 5, 6 is a voice coil, 7 is a damper, 8 is a dust cap, 9 is a cone body, 10A is an edge, A
frame 2 secures the outer periphery of the cone body 9 via the edge 10A.
10a is an extension of the ellipse formed by the edge 10A, and 10b is a relative angle between
the major axis of the ellipse formed by the edge 10A and the central axis of the speaker. In the
present embodiment, the cross-sectional shape of the edge 10A is a part of an ellipse connected
by 10a, and the minor axis is the inner diameter of the edge and the major axis is the edge center
and the edge by tilting the major axis at an angle of 10b with the speaker central axis. It is set
between the outer diameter. Therefore, the edge 10A rises at a steep angle from the outer
diameter to the major axis, and changes from the major axis to the minor axis as a loose curve,
reaching the inner diameter.
[0011]
As a result, the flexibility of the inner edge of the edge is increased and it is easy to move with
small amplitude, and the range is broadened by inclining the central axis of the ellipse. Lowers
and the amplitude is suppressed. At this time, since the cross-sectional shape of the edge
constantly changes, the change in the degree of flexibility is smooth and there is no clipping
sound, and the effect of the amplitude control is also large. That is, as in the present embodiment,
the point of the minor axis is set to the inner diameter of the edge, and the point that is parallel
to the speaker central axis by the curve outside the major axis is set to the outer diameter of the
edge. Change can be maximized. It is also possible to improve the durability of the edge while
maintaining the effect of the amplitude control by making the above-mentioned ellipse the basic
shape of the edge cross section and giving small R etc. to the inner diameter and outer diameter
of the edge.
[0012]
In addition, although the cross section of the edge 10A of this embodiment is an elliptical shape,
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it may be a shape similar to an ellipse, and the cross section curve may be a continuous diversion
curve. As a result, while maintaining the effect of amplitude control, it is possible to improve the
productivity of the mold and the degree of freedom in edge design.
[0013]
Second Embodiment Another embodiment of the present invention will be described with
reference to FIG. FIG. 2 shows a diaphragm which is an essential part of another embodiment,
wherein (a) is a top view, (b) is a Y-Y sectional view of (a), (c) is an XX of (a) FIG.
[0014]
12 is an edge, 13 is an uproll portion of the edge 12, 13a is an ellipse formed by the uproll
portion 13, 14 is a downroll portion of the edge 12, and 14a is an ellipse formed by the downroll
portion 14. There is. The combined edge 12 of the up roll 13 and the down roll 14 is
characterized by good front / rear symmetry of the amplitude, but the basic shape of this edge
cross section should be an ellipse (or a continuous continuous change curve similar to an ellipse)
As a result, the effect of the amplitude control of the first embodiment is added, and it is possible
to further improve the audible sound quality with a full range speaker or the like.
[0015]
The loudspeaker according to the present invention can be used for general loudspeakers that
use an edge that supports the diaphragm so as to move up and down.
[0016]
(A) a sectional view of the first embodiment of the speaker according to the present invention, (b)
an enlarged view of an edge portion which is the main portion (a) a top view of an amplitude
plate which is the main portion of the other embodiment b) Y-Y cross-sectional view of (a) of the
figure (c) XX cross-sectional view of (b) of the figure (a) Cross-sectional view of the conventional
speaker (b) enlargement of the edge portion which is the main part Figure
Explanation of sign
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[0017]
DESCRIPTION OF SYMBOLS 1 Magnetic circuit 2 Frame 6 Voice coil 9 Cone body (diaphragm)
10A Edge 10a Elliptical extension line 10b formed by the edge 10A Relative angle between the
major axis of the ellipse formed by the edge 10A and the speaker central axis 12 Edge 13 Edge
12 Up-roll portion 13a Extension line of the ellipse formed by the up-roll portion 13 Down-roll
portion 14a of the edge 12 Extension line of the ellipse formed by the down-roll portion 14
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