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JPH05168091

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH05168091
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in automobiles and various other audio devices.
[0002]
2. Description of the Related Art In recent years, a large output audio amplifier capable of
applying a large input to a speaker used particularly for automobiles has come to be widely used,
and a demand for development of a high input resistant speaker has been increased.
[0003]
Hereinafter, a conventional speaker in which the radiation surface of the edge is covered with the
outer periphery of the diaphragm will be described with reference to the drawings.
FIG. 6 is a structural cross-sectional view of a conventional speaker of this type described in
Japanese Utility Model Laid-Open Publication No. 52-79925.
[0004]
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1
In FIG. 6, a magnetic circuit 5 is constituted by a lower plate 2 having a center pole 1, a ringshaped magnet 3 and a ring-shaped upper plate 4 and a frame 6 is coupled to the upper surface
of the magnetic circuit 5. Further, the suspension 9 is fixed to the frame 6 while holding the
middle portion of the voice coil 7 so that the lower portion of the voice coil 7 fits into the
magnetic gap 8 of the magnetic circuit 5 without being eccentric. Furthermore, the diaphragm
10 has a larger outer periphery so as to cover the radiation surface of the edge 11 and a flat
flange 12 is provided on the outer edge of the diaphragm 10. The upper portion of the voice coil
7 is coupled to the central portion of the diaphragm 10, and the dust cap 14 is fixed to the
central upper surface of the diaphragm 10.
[0005]
The operation of the loudspeaker configured as described above will be described below. First,
when an input signal is applied, the voice coil 7 moves according to Fleming's left hand rule, and
this force causes the diaphragm 10 to vibrate and radiate sound into the air. There is a place
where the movement of is opposite. This is referred to as reverse resonance of the edge, and if
the diaphragm 10 does not cover the radiation surface of the edge 11, it appears at a frequency
near 10 times the lowest resonance frequency of the speaker and dips in the sound pressure
level-frequency characteristic Will occur.
[0006]
In the case of this conventional example, the sound wave radiated from the edge 11 is blocked by
the outer peripheral part of the diaphragm 10, and only the sound wave radiated from the
diaphragm 10 is reproduced. The dip appearing in the pressure level-frequency characteristic
can be reduced.
[0007]
However, in the above-described conventional configuration, the amplitude of the diaphragm 10
in the vertical direction causes the flange 12 of the diaphragm 10 to abut against the edge 11, so
a large input can be made to the speaker. There was a problem that it could not be applied.
In order to solve this problem, it is necessary to increase the overall height of the diaphragm 10
to make the inclination angle θ small and to increase the vertical distance between the flange 12
and the edge 11. However, in this case, the overall height of the speaker is also increased, and
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there is a problem that it can not be realized particularly for a thin type such as a car speaker,
which requires high input resistance.
[0008]
In addition, when the shape of the diaphragm is an oval or an ellipse, the inclination angle of the
diaphragm is different in the circumferential direction, so that the mold for cutting the outer
periphery of the diaphragm is very complicated and expensive. The
[0009]
This case will be described in detail with reference to the drawings.
FIG. 7A is a cross-sectional view in the major axis direction of a speaker having an elliptical shape
when configured by the conventional method. In the figure, the configuration is the same as that
described in the prior art, but the edge 15 is formed into a roll shape, and the dust cap 16 is
changed to a shape to be covered on the upper surface of the voice coil 7. FIG.7 (b) is sectional
drawing of the short axis direction of the speaker. As can be seen by comparing the two figures,
the inclination angle α in the major axis direction of the diaphragm 17 is large and the
inclination angle β in the minor axis direction is small. Therefore, the height of the diaphragm
17 in the major axis direction The height Hβ in the minor axis direction is not the same as Hα.
That is, since the height of the diaphragm 17 is different in the circumferential direction, the
structure of the mold for cutting the outer periphery of the diaphragm 17 becomes complicated.
[0010]
The present invention solves the above-mentioned conventional problems. Even if a large input is
applied, the diaphragm and the edge do not contact to generate an abnormal sound, and
moreover, the shape of the diaphragm is an oval or an ellipse. An object of the present invention
is to provide a speaker with little influence of edge reverse resonance which can be easily
realized even in the shape.
[0011]
SUMMARY OF THE INVENTION In order to achieve the above object, the speaker of the present
invention is provided with a rising portion near the outer peripheral portion of the diaphragm
and a flat or rolled flange on the outside thereof to have the radiation surface of the edge The
inner periphery of the edge is coupled to the inside of the rising portion of the diaphragm so as
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3
to be covered with the diaphragm.
[0012]
With this configuration, the rising portion provided near the outer periphery of the diaphragm
secures a distance in the vertical direction between the edge and the outer periphery of the
diaphragm, so that the edge and the diaphragm do not contact to generate an abnormal sound. .
Further, in the case of a speaker having an oval or elliptical shape, the height of the diaphragm
can be made constant by changing the dimension of the rising portion provided near the
diaphragm in the circumferential direction. Thus, it is possible to easily manufacture an outer
peripheral cutting die of an oval or elliptical diaphragm.
[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) An embodiment of the
present invention will be described below with reference to the drawings.
In the case of being the same as the conventional example, the same number is given and the
detailed explanation is omitted. FIGS. 1A and 1B are structural cross-sectional views of a
loudspeaker according to a first embodiment of the present invention. In FIG. 1A, a magnetic
circuit 5 is constituted by a lower plate 2 having a center pole 1, a magnet 3 and an upper plate
4, and a suspension 9 is a voice coil 7 so that the lower portion of the voice coil 7 fits into the
magnetic gap 8 correctly. And hold it on the frame 6. Furthermore, the diaphragm 18 has a
larger outer periphery so as to cover the radiation surface of the edge 19, and a rising portion 20
is provided outside the position where the edge 19 and the diaphragm 18 are fixed. Are
equipped. In addition, the outer peripheral portion of the edge 19 is fixed to the frame 6 together
with the gasket 13, and the central portion of the diaphragm 18 and the voice coil 7 are coupled
to fix the dust cap 14. FIG. 1 (b) is an enlarged cross-sectional view around the outer periphery of
the diaphragm 18.
[0014]
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The operation of the loudspeaker configured as described above will be described below. First,
when an input signal is applied, the voice coil 7 moves according to Fleming's left-hand rule, and
the diaphragm 18 oscillates to radiate sound into the air. Also in this case, as described in the
conventional example, since the outer peripheral portion of the diaphragm 18 blocks the sound
wave emitted from the edge 19, the influence of the reverse resonance of the edge 19 is
suppressed and the dip appearing in the sound pressure level-frequency characteristic Can be
made smaller. Further, since the rising portion 20 provided on the diaphragm 18 secures a large
vertical distance between the flange 21 and the edge 19, a large input is applied, and even if the
diaphragm 18 vibrates largely, the flange 21 contacts the edge 19 No abnormal sound is
generated. Furthermore, the rising portions 20 and the flanges 21 function as bent ribs of the
diaphragm 18 and have an effect of increasing the mechanical strength of the diaphragm 18
against the piston movement and suppressing the high-frequency split resonance of the
diaphragm 18. The flat characteristic can be obtained by preventing the disturbance of the sound
pressure level-frequency characteristic.
[0015]
As described above, the rising portion 20 is provided near the outer periphery of the diaphragm
18 and the flange 21 is provided on the outer side thereof, and the inner periphery of the edge
19 is inside the rising portion 20 so that the radiation surface of the edge 19 is covered with the
diaphragm 18. By connecting the diaphragm to the diaphragm 18, the influence of the reverse
resonance of the edge 19 is suppressed and the flange 21 of the diaphragm 18 and the edge 19
contact to generate an abnormal sound even if a large input is applied. In addition, it is possible
to configure an excellent speaker having flat sound pressure level-frequency characteristics by
suppressing split resonance of the diaphragm 18. Here, it is added that the gap L between the
inside of the gasket 13 and the end of the flange 21 of the diaphragm 18 is preferably about 1 to
2 mm.
[0016]
Second Embodiment A second embodiment of the present invention will be described with
reference to the drawings. FIGS. 2 (a) and 2 (b) are structural cross-sectional views of a
loudspeaker in which the shape of the diaphragm is an oval according to a second embodiment
of the present invention. 2 (a) is a cross-sectional view in the long axis direction, and FIG. 2 (b) is
a cross-sectional view in the short axis direction. The basic configuration is the same as that of
FIG. 7, so only the differences will be described here. The dimension of the rising portion 23
provided on the elliptical diaphragm 22 is changed between H1 in the major axis direction and
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H2 in the minor axis direction to make the height H0 of the diaphragm 22 the same over the
entire circumference It is.
[0017]
Also in the operation of the speaker configured as described above, the influence of the reverse
resonance of the edge 19 is suppressed and the contact between the edge 19 and the flange 24
provided on the diaphragm 22 is avoided, as described in the first embodiment. The mechanical
strength of the diaphragm 22 can be increased to suppress split resonance to flatten the sound
pressure level-frequency characteristics. In the case of this embodiment, the height H0 of the
diaphragm 22 can be made the same by changing the dimension of the rising portion 23
provided on the diaphragm 22 over the entire circumference, so the die for cutting the outer
periphery of the diaphragm 22 can be easily made. It can be manufactured inexpensively, and
moreover, the maintenance of the mold can be made extremely simple.
[0018]
Here, experimental examples of the second embodiment of the present invention will be
described. In the test product, the dimensions of the diaphragm 22 are elliptical with 215.6 mm
on the major axis side and 146 mm on the minor axis side, and the dimensions of the rising
portion 23 change in the minor axis direction H2 = 3.5 mm in the major axis direction H1 = 3.1
mm And the height H0 of the diaphragm 22 was 45.5 mm. The sound pressure level-frequency
characteristic in this case is shown in FIG. In FIG. 3, the solid line is the characteristic of the
configuration of the second embodiment of the present invention, and the broken line is the
characteristic of the conventional configuration without the rising portion on the diaphragm. As
can be seen by comparing the two, the present invention provides the rising portion 23 in the
diaphragm 22 to increase the mechanical strength of the diaphragm 22 and suppress the split
resonance in the high region, resulting in a characteristic with less peak and dip. ing. Further,
according to the configuration of the present invention, although the lowest resonance frequency
is as low as 55 Hz, the flange 24 and the edge 19 do not hit even if 15 W of a sine wave signal is
applied. However, in the case of the conventional configuration, since the flange of the
diaphragm 17 and the edge 15 contact each other at 6.3 W and an abnormal sound is generated,
the input resistance can be more than doubled by the present invention.
[0019]
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6
Next, an example of the shape of the rising portion provided on the diaphragm and the flat
portion on the outside thereof will be described. FIG. 4 is an enlarged sectional view around the
outer periphery of the diaphragm showing another shape of the speaker in the present invention.
In the figure, a falling portion 26 smaller than the rising dimension is provided outside the rising
portion 25. With this configuration, the mechanical strength of the diaphragm 22 against the
piston movement is dramatically increased, so that the split resonance can be made extremely
small. FIG. 5 is an enlarged sectional view around the outer periphery of the diaphragm showing
another shape of the speaker in the present invention. In the shape of FIG. 5, a roll-shaped flange
28 is provided on the outside of the rising portion 27. When this shape is used, there is no flat
portion, so that it is particularly suitable for a large input speaker with almost no resonance at
the outer edge.
[0020]
As described above, according to the present invention, the rising portion is provided near the
outer periphery of the diaphragm and a flat or roll flange is provided outside the rising portion
so that the radiation surface of the edge is covered with the diaphragm. By combining the inner
circumference of the edge with the diaphragm on the inner side, the effect of reverse resonance
of the edge and split resonance of the diaphragm can be suppressed, and the sound pressure
level-frequency characteristics are flat, and a large input can be applied. Speaker can be realized.
Furthermore, even if the diaphragm has an oval shape or an oval shape, the height of the
diaphragm can be made the same over the entire circumference by changing the dimension of
the rising portion in the circumferential direction. Can be easily manufactured.
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