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JPH1098795

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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 JPH1098795
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
edge of a cone type speaker, and more particularly to a speaker edge suitable for a low frequency
reproduction speaker having a large aperture and requiring a large amplitude.
[0002]
2. Description of the Related Art The basic construction of a cone type loudspeaker consists of a
vibration system including a cone, a magnetic circuit and a frame for supporting them. FIG. 5 is a
block diagram showing a speaker structure, and FIG. 6 shows amplitude linearity characteristics
of the speaker. FIG. 7 is a cross-sectional view showing the shape of the conventional edge, where
(a) is a semicircular up roll shape, (b) is an arc up roll shape, (c) is a semicircular down roll shape,
d) is an arc type down roll shape.
[0003]
The vibration system includes a cone-shaped diaphragm 51, an edge 52 for supporting the outer
periphery of the diaphragm 51, a voice coil 53 for driving the diaphragm 51, and a damper 54
for supporting a voice coil bobbin 60 around which the voice coil 53 is wound. There is. The
magnetic circuit is composed of a pole piece 57 made of a ferromagnetic material (such as iron),
a plate 58 and a yoke 59 in order to efficiently focus the magnetic energy of the magnet 55 in
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the magnetic gap 56. The voice coil 53 is obtained by winding an electric wire around a thin
cylindrical voice coil bobbin 60. When an audio current flows through the electric wire, a driving
force is generated by an electromagnetic action with the magnetic force in the magnetic gap 56.
The driving force changes in proportion to the strength of the current, and the diaphragm 51
vibrates in response to the current flowing through the voice coil 53 to generate a sound wave. A
frame 61 having a substantially inverted conical shape is formed to support the vibration system,
magnetic circuit, etc., and the edge 52 and one end of the damper 54 are bonded.
[0004]
Although the diaphragm 51 vibrates due to the voice current flowing through the voice coil 53,
harmonic distortion is likely to occur when the amplitude thereof becomes large. As this factor,
there are linearity characteristics of the edge 52 and the damper 54 directly resulting from the
amplitude linearity characteristic of the speaker. The most common shape of the edge 52 is a
corrugation edge (belly shape) and a roll edge (arc shape). Among them, the roll edge has many
resonances of the edge itself and can be made high compliance, so it is often used for low band
reproduction, and it has a semicircular cross section in (a) cross section of FIG. b) A crosssectional arc shape that protrudes to the front of the speaker, (c) a cross-sectional semicircular
shape that protrudes to the rear of the speaker, (d) a cross-sectional arc shape that shows a
shape that protrudes to the rear of the speaker There are many.
[0005]
SUMMARY OF THE INVENTION The amplitude linearity characteristic of the speaker (the
relationship between the driving force of the voice coil 53 and the amplitude of the diaphragm) is
ideally linear displacement characteristics as shown in FIG. In the speaker edge structure as
described above, deviation from the ideal is caused due to the characteristics of the edge and the
non-linearity of other suspensions (dampers and the like) of the vibration system.
[0006]
The present invention is directed to an edge whose amplitude linearity characteristic is improved
by almost any damper in combination with the optimum design of the edge 52 which is one of
the suspensions of the vibration system.
[0007]
SUMMARY OF THE INVENTION The present invention achieves the above object and provides a
diaphragm bonding portion bonded to a diaphragm of a speaker, a frame bonding portion
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bonded to a speaker frame, and the diaphragm bonding portion. And a speaker edge which
elastically deforms the diaphragm from the elastically deformable roll portion between the frame
bonding portion and the frame bonding portion, the roll portion including the diaphragm
bonding portion and the frame bonding portion , And arc-shaped arc portions connecting the tips
of the first and second rising portions.
[0008]
In addition, the inclination angle of the first and second rising portions is approximately 80 °,
and the ratio of the width to the height of the roll portion is 8: 7, and the arc portion passes the
apex of the roll portion and the vibration is It is characterized in that it has a shape of a line
parallel to the plate bonding portion and the frame bonding portion, and a circular arc contacting
the first and second rising portions.
Further, it is characterized in that it is bonded to the diaphragm and the speaker frame so that
the roll portion protrudes in front of the speaker.
[0009]
In addition, it is characterized in that it is adhered to the diaphragm and the speaker frame so
that the roll portion protrudes to the rear of the speaker.
[0010]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing the shape of an edge according to a first embodiment of
the present invention.
Since the present embodiment is characterized in the shape of the edge, the configuration other
than the edge is the same as that of the speaker shown in FIG.
[0011]
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The edge 12 supporting the outer periphery of the diaphragm 51 of the speaker is made of the
same paper, cloth or resin such as urethane foam as the diaphragm 51, rubber, etc. and is fixed
to the diaphragm 51 and the frame 61 on both sides. A diaphragm bonding portion 121 and a
frame bonding portion 122 are horizontally projected from the point A and the point B at both
ends of the roll portion 123 (integral molding).
In addition, although a diaphragm may be expressed including an edge, in this specification, a
diaphragm is demonstrated as a thing which does not include an edge. And the cross-sectional
shape of the roll part 123 is formed in the reverse U-shape which the hem which connected the
straight line L1 and the straight line L2 and the circular arc 124 spread. Straight lines L1 and L2
are inclined at an inclination angle of 80 ° (a point perpendicular to the straight line connecting
the points A and B) from the points A and B which are connection points between the roll part
123 and the diaphragm bonding part 121 and the frame bonding part 122 The angle .alpha. The
arc 124 is formed by a part of a circle inscribed in a straight line L3 and straight lines L1 and L2
parallel to a straight line connecting the points A and B through the upper end (apex C) of the
edge 12. Further, the ratio of the dimension a between the point A and the point B to the
dimension b (height of the roll portion 123) to the straight line connecting the points A and B
and the vertex C is 8: 7. Is set as.
[0012]
Then, the diaphragm bonding part 121 is bonded to the outer periphery of the diaphragm 51 so
that the edge 12 has the roll part 123 protruding forward of the speaker, and the frame bonding
part 122 is bonded to the frame 61 to support the outer periphery of the diaphragm 51 Do. Next,
the characteristics of the speaker using the edge according to the present embodiment will be
described. FIG. 2 is a graph showing an amplitude linearity characteristic of a speaker using an
edge according to the present embodiment, in which (a) is combined with a damper with good
linearity and (b) is combined with a damper with poor linearity It shows. Also, FIG. 3 is a graph
showing the amplitude linearity characteristic of a conventional speaker using an edge, in which
(a) shows a combination with a damper with good linearity and (b) shows a combination with a
damper with poor linearity. ing.
[0013]
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The linearity characteristics of the speaker using the edge according to the present embodiment
shown in FIG. 2 are superior in linearity to the linearity characteristics of the speaker shown in
FIG. In particular, a significant difference can be seen in the linearity of the linearity
characteristic at large amplitude. And, even when used in combination with a damper with good
linearity characteristics, or when used in combination with a damper with poor linearity
characteristics, the use of the edge according to this embodiment results in the linearity of the
linearity characteristics being excellent. ing. Then, in the one-sided characteristic (+ P: amplitude
of vibration in the forward direction of the speaker, -P: amplitude of vibration in the backward
direction of the speaker), the linearity characteristics of the speaker using the conventional edge
differ depending on the vibration direction. In contrast, the linearity characteristic of the speaker
using the edge according to the present embodiment has little difference in the amplitude
characteristic in the vibration direction on both sides, and is effective for reduction of distortion. I
understand. Note that “PP” of the graph indicates the double-sided amplitude characteristic
(the sum of the amplitude of the vibration in the forward direction of the speaker and the
amplitude of the vibration in the rearward direction of the speaker, so-called PEAK TO PEAK).
[0014]
Next, a second embodiment of the present invention will be described. FIG. 4 is a cross-sectional
view showing the shape of an edge according to a second embodiment of the present invention.
Since the present embodiment is characterized in the shape of the edge, the configuration other
than the edge is the same as that of the speaker shown in FIG. The edge 42 supporting the outer
periphery of the diaphragm 51 of the speaker is formed of the same paper, cloth or resin such as
urethane foam as the diaphragm 51, and is fixed to the diaphragm 51 and the frame 61 on both
sides. A diaphragm bonding portion 421 and a frame bonding portion 422 are horizontally
projected from the point D and the point E at both ends of the roll portion 423 (integrally
formed). And the cross-sectional shape of the roll part 423 is formed in the U-shape which the
hem which connected the straight line L1 and the straight line L2 and the circular arc 424
spread. Straight lines L1 and L2 are inclined at an inclination angle of 80 ° (a line perpendicular
to a straight line connecting points D and E from points D and E which are connection points
between the roll portion 423 and the diaphragm bonding portion 421 and the frame bonding
portion 422. The angle .alpha. The arc 424 is formed by a part of a circle inscribed in a straight
line L3 and straight lines L1 and L2 parallel to a straight line connecting the point D and the
point E through the lower end (apex F) of the edge 42. Further, the arc 423 has a ratio of the
dimension c between the point D and the point E, the dimension d (height of the roll portion 423)
to the straight line connecting the point D and the point E and the vertex F is 8: 7. Is set as.
[0015]
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The diaphragm bonding part 421 is bonded to the outer periphery of the diaphragm 51 so that
the roll 423 of the edge 42 protrudes to the rear of the speaker, and the frame bonding part 422
is bonded to the frame 61 to support the outer periphery of the diaphragm 51 Do. According to
the present embodiment having the configuration as described above, the same characteristics as
those of the first embodiment shown in FIGS. 2 and 3 can be obtained.
[0016]
As described above, according to the speaker edge structure of the present invention, amplitude
linearity characteristics can be improved and harmonic distortion of the speaker can be reduced.
[0017]
Brief description of the drawings
[0018]
1 is a cross-sectional view showing the shape of the edge according to the first embodiment of
the present invention.
[0019]
2 is a graph showing the amplitude linearity characteristics of the speaker according to the
present embodiment.
[0020]
3 is a graph showing the amplitude linearity characteristics of the conventional speaker.
[0021]
4 is a cross-sectional view showing the shape of the edge according to a second embodiment of
the present invention.
[0022]
5 is a configuration diagram showing a speaker structure.
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[0023]
6 is a graph showing the amplitude linearity characteristics of the speaker.
[0024]
7 is a cross-sectional view showing the shape of the conventional edge.
[0025]
Explanation of sign
[0026]
12: Edge 121: Diaphragm bonding part 122: Frame bonding part 123: Roll part 124: Arc
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