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JP2008167111

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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 JP2008167111
PROBLEM TO BE SOLVED: To provide a speaker edge capable of preferable sound reproduction,
in which a reproduction frequency range is wide and the lowest resonance frequency f0 hardly
changes even when replacing from a conventional roll edge. SOLUTION: The speaker edge
according to the present invention has an inner circumferential joint joined to an outer
circumferential end of a cone type diaphragm, an outer circumferential joint joined to a frame,
and an inner circumferential joint and an outer circumferential joint. A movable portion formed
to extend from the inner circumferential joint to the outer circumferential side on an extension of
an inner circumferential shape line defining the cross sectional shape of the inner circumferential
joint in a sectional shape; 1 Movable part, and is formed extending from the first movable part to
the outer peripheral side out of the extension line of the inner peripheral shape wire in the cross
sectional shape, and connected to the outer peripheral joint in a waveform whose cross sectional
shape is bent And a movable portion. [Selected figure] Figure 1
Speaker edge and speaker diaphragm and speaker using the same
[0001]
The present invention relates to an edge used for a speaker for sound reproduction, a speaker
diaphragm using the same, and a speaker.
[0002]
In particular, in the case of an electrodynamic speaker, the speaker has an edge at the outer
peripheral end of the speaker diaphragm in order to center the speaker diaphragm connected to
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1
the voice coil on the inner peripheral side at a predetermined position and to enable good
vibration. Is provided.
The free edge generally used in a cone-shaped diaphragm is joined at its inner peripheral side to
the outer peripheral end of the cone-shaped diaphragm, its outer peripheral side is joined and
fixed to a frame, and is formed of flexible material between them. And a movable portion
elastically supporting the speaker diaphragm. Various studies have been made on the shape and
material of the speaker edge.
[0003]
The shape of the movable portion of the conventional speaker edge is typically a roll edge or a
corrugation edge, and various studies are made according to the frequency of the sound
reproduced by the speaker. That is, in the operation in the bass region where the displacement
amplitude of the speaker diaphragm is large, the shape of the movable portion of the edge is
devised to ensure the flexibility of the movable portion affecting the reproduction low frequency
limit frequency f0 of the speaker There are some which try to reduce non-linear distortion by
making it difficult to cause defects such as causing defects and improving linearity and
symmetry. On the other hand, in the operation in the middle to high range where the
displacement amplitude of the speaker diaphragm is small, the vibration in the cone type
diaphragm may propagate and be reflected at the edge, and peak dip may occur on the frequency
characteristic. The shape of the movable portion is formed in a linear portion along the shape of
a cone-shaped diaphragm to try to reduce this peak dip.
[0004]
Also, in the prior art, there is a combination of a roll shape and a corrugation shape as the shape
of the speaker edge. For example, there is one in which a fold is provided from the vicinity of the
top of the edge to the inner peripheral part on the diaphragm side (Patent Document 1). Further,
for example, there is one in which a corrugation having an asymmetrical shape in cross section is
provided on the arc of a convex edge (Patent Document 2). Further, for example, there is one in
which narrow grooves in the circumferential direction are formed in the curved portion of the
edge member (Patent Document 3).
[0005]
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2
Japanese Utility Model Laid-Open Publication No. 60-95792 (FIG. 3) Japanese Patent Laid-Open
Publication No. 63-90997 (FIGS. 1 and 2) Japanese Patent Laid-Open Publication No. 3-104499
(FIGS. 1 and 3)
[0006]
However, according to the speaker edge of the prior art and the speaker using the same, it is not
possible to simultaneously cope with the large displacement amplitude in the low range and the
correspondence to the peak dip in the frequency characteristic in the middle and high range.
There is enough point.
In particular, in the case of a small-aperture speaker, the edge for a conventional speaker may
affect the high frequency limit frequency where the speaker splits and vibrates, and its shape
must be devised.
[0007]
The present invention has been made to solve the above-mentioned problems of the prior art,
and the object thereof relates to an edge used for a speaker, and a speaker diaphragm and a
speaker using the same, having a wide reproduction frequency range, Even if the lowest
resonance frequency f0 is hard to change even when replacing from the conventional roll edge,
and even when the input signal with a large amplitude is applied to the voice coil, defects such as
noise are less likely to occur, and preferable voice reproduction is To provide a possible speaker
edge.
[0008]
The speaker edge according to the present invention is movable between an inner peripheral
joint joined to the outer peripheral end of the cone-shaped diaphragm, an outer peripheral joint
joined to the frame, and an inner peripheral joint and an outer peripheral joint. And the movable
portion is extended from the inner peripheral joint portion to the outer peripheral side on an
extension of an inner peripheral shape line defining the cross sectional shape of the inner
peripheral joint portion in the sectional shape The first movable portion formed and the outer
peripheral joint portion which is formed to extend from the first movable portion to the outer
peripheral side out of the extension line of the inner peripheral shape line in the sectional shape,
and the waveform whose sectional shape is bent And a second movable portion coupled thereto.
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[0009]
Preferably, in the speaker edge according to the present invention, the second movable portion is
extended so as to be substantially orthogonal to the first movable portion in the sectional shape
of the movable portion, and the first movable portion and the second movable portion are
connected The movable part ridge line substantially defined annularly by the part is formed so as
to project most to the front side.
[0010]
More preferably, in the speaker edge according to the present invention, in the cross-sectional
shape of the movable portion, the width W1 of the first movable portion is larger than the width
W2 of the second movable portion, and the first movable portion of the movable portion is The
annular area S1 which it has is larger than the annular area S2 which the 2nd movable part has.
[0011]
Further, the speaker diaphragm of the present invention includes the speaker edge of the present
invention, and a cone-shaped diaphragm in which the inner peripheral joint portion of the
speaker edge is joined to the outer peripheral end thereof.
[0012]
Furthermore, the speaker of the present invention comprises the speaker diaphragm of the
present invention.
[0013]
Hereinafter, the operation of the present invention will be described.
[0014]
The speaker edge according to the present invention is movable between an inner peripheral
joint joined to the outer peripheral end of the cone-shaped diaphragm, an outer peripheral joint
joined to the frame, and an inner peripheral joint and an outer peripheral joint. And a
substantially annular speaker edge.
The inner circumferential joint portion is joined to the outer peripheral end of the cone-shaped
diaphragm, and the force applied by the vibration of the cone-shaped diaphragm is transmitted.
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The outer peripheral fixing portion is substantially joined and fixed to the frame.
Therefore, the substantially annular movable portion formed between the inner circumferential
joint portion and the outer circumferential joint portion elastically supports the speaker
diaphragm.
In the speaker using the speaker diaphragm in which the speaker edge is joined, the vibration
system including the voice coil bobbin is centrally held at a predetermined position by the
speaker edge, and the driving force generated by the voice coil is added to deform the movable
portion. The vibration system can vibrate.
[0015]
Here, the movable portion of the speaker edge is composed of a first movable portion whose
cross-sectional shape is along the extension of the inner circumferential joint portion and a
second movable portion whose waveform is bent.
Specifically, the movable portion is a first movable portion formed extending from the inner
circumferential bonding portion to the outer circumferential side on an extension of an inner
circumferential shape line defining the cross sectional shape of the inner circumferential bonding
portion in the cross sectional shape And a second movable portion which is formed to extend
from the first movable portion to the outer peripheral side out of the extension line of the first
movable portion in the cross sectional shape, and which is connected to the outer peripheral joint
portion by a waveform whose cross sectional shape is bent. And.
[0016]
In the cross-sectional shape, the first movable portion extends from the inner circumferential
joint to the outer circumferential side on an extension of the inner circumferential shape line
defining the cross sectional shape of the inner circumferential joint joined to the outer
circumferential end of the cone-shaped diaphragm. To be formed.
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If the outer peripheral end of the cone-shaped diaphragm is a straight cone shape in a cross
sectional shape, the cross sectional shape of the inner peripheral bonding portion is a linear
inner peripheral shape line, and as a result, the first movable portion is a straight line It has a
cross section of
If the cross-sectional shape is a circular arc-shaped curved cone, the cross-sectional shape of the
inner circumferential joint portion is a circular arc-shaped inner circumferential shape line, and
as a result, the first movable portion has a circular arc-shaped cross section. Therefore, the
vibration propagating through the cone-shaped diaphragm becomes less likely to be reflected at
the boundary between the inner peripheral joint portion and the first movable portion, so in the
speaker using the speaker diaphragm having the speaker edge joined, It becomes difficult for the
peak dip due to the reflection at the edge to occur on the sound pressure frequency
characteristic.
[0017]
Further, in the cross-sectional shape, the second movable portion is a waveform whose crosssectional shape is bent and forms a corrugation. The second movable portion is formed so as to
extend out of the extension of the first movable portion and extend from the first movable
portion to the outer peripheral side. Preferably, the second movable portion has a sectional shape
of the movable portion, It extends so as to be substantially orthogonal to the first movable
portion. The movable part ridge line substantially defined annularly by the connection part of the
1st movable part and the 2nd movable part protrudes on the front side rather than the inner
circumference joint and the outer circumference joint, and protrudes on the most front side of
the speaker edge Formed as. Therefore, since the second movable portion elastically supports the
outer peripheral side of the first movable portion and is deformed in the front-rear direction by
the flexibility of the corrugation, it can correspond to a large displacement amplitude in the low
frequency range, Even when replacing from the roll edge, the lowest resonance frequency f0
hardly changes. In addition, even when an input signal having a large amplitude is applied to the
voice coil, a defect such as generation of noise does not easily occur.
[0018]
In the movable portion of the speaker edge, the width W1 of the first movable portion in the
sectional shape is larger than the width W2 of the second movable portion, and the annular area
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S1 of the first movable portion of the movable portion is The annular area S2 of the second
movable portion is larger. When the width W1 of the first movable portion is increased, the first
movable portion acts as a diaphragm that radiates a sound wave as the cone type diaphragm. In
the case of forming a speaker edge formed of a lightweight edge material impregnated with a
phenol resin on a fabric base, the first movable portion can improve the high frequency band
limit frequency characteristics. In particular, in the case of a small diameter speaker, the area of
the edge of the speaker is relatively larger than the area of the cone-shaped diaphragm, so the
influence of the annular area S1 of the first movable portion is increased. Depending on the
diameter of the speaker, if the width W1 of the first movable portion is larger than the width W2
of the second movable portion, the annular area S1 of the first movable portion should be larger
than the annular area S2 of the second movable portion. Can improve the high frequency
characteristics of the speaker.
[0019]
The shape of the second movable portion of the speaker edge may be a waveform in which the
cross-sectional shape is bent, may be a waveform in which a plurality of small radius rolls
continue, or may be a stepped waveform. . The movable part ridge line substantially defined in a
ring shape by the connection part between the first movable part and the second movable part
deviates from the extension of the first movable part so that it projects most to the front side of
the speaker edge. It may extend from the movable portion to the outer peripheral side. As a
result, in the speaker using the speaker edge according to the present invention, the
reproduction frequency range is wide, and the minimum resonance frequency f0 hardly changes
even when it is replaced from the conventional roll edge, and an input signal with a large
amplitude is applied to the voice coil. Even in such a case, defects such as generation of abnormal
noise are unlikely to occur, and preferable sound reproduction becomes possible.
[0020]
The speaker using the speaker edge according to the present invention has a wide reproduction
frequency range, and even when an input signal with a large amplitude is applied to the voice
coil, the minimum resonance frequency f0 changes even if it is replaced from the conventional
roll edge. It is hard to do, it is hard to produce defects, such as generating noise, and it can realize
the speaker which can perform desirable sound reproduction.
[0021]
According to the speaker edge of the present invention, the reproduction frequency range is
wide, and even if it is replaced from the conventional roll edge, the lowest resonance frequency
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f0 hardly changes, and even if an input signal with a large amplitude is applied to the voice coil,
An outer circumferential joint joined to a frame and an inner circumferential joint joined to an
outer circumferential end of a cone-shaped diaphragm, for the purpose of providing an edge for
a speaker capable of producing preferable sound reproduction without causing defects such as
generating sounds. A substantially annular speaker edge including a movable portion formed
between the inner peripheral joint portion and the outer peripheral joint portion, the movable
portion defining the sectional shape of the inner peripheral joint portion in the sectional shape
The first movable portion is formed extending from the inner circumferential joint portion to the
outer circumferential side on the extension of the circumferential line, and extends from the first
movable portion to the outer circumferential side out of the extension of the inner
circumferential shape line in the sectional shape Set up Made, and, by to have a second movable
portion connected to the outer peripheral joints in waveform whose cross section bends, were
achieved.
[0022]
Hereinafter, although the edge for speakers by the preferred embodiment of the present
invention, the speaker diaphragm using the same, and a speaker are explained, the present
invention is not limited to these embodiments.
[0023]
FIG. 1 is a cross-sectional view for explaining a speaker 1 using a speaker edge 10 according to a
preferred embodiment of the present invention.
The speaker 1 of this embodiment is a small-sized electrodynamic speaker with a diameter of 3
cm, and is provided with a circular cone type diaphragm 8, and an edge 10 described later is
joined to the outer peripheral end of the circular cone type diaphragm 8. .
[0024]
The speaker 1 additionally includes a magnetic circuit 2 comprising a pole, a magnet and a plate
and provided with a magnetic gap 3, a frame 4 attached to the magnetic circuit 2 and vibratably
supporting the cone diaphragm 8, and a magnetic gap 3, the bobbin 6 around which the voice
coil 5 is wound, the damper 7 having the outer peripheral end joined to the frame 4 and the
inner peripheral end joined to the bobbin 6, and the inner end on the upper end side of the
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bobbin 6 It has a cone-shaped diaphragm 8 which joins peripheral ends, and a dust cap 9 which
is joined to the cone-shaped diaphragm 8.
The tinsel wire and terminal for supplying the voice signal current to the voice coil 5 are omitted
in FIG.
[0025]
In the speaker 1, the voice coil 5 is disposed in the magnetic gap 2 in which a strong DC
magnetic field is generated, and when an audio signal current is supplied to the voice coil 5, the
front and back direction of the cone type diaphragm 8 (up and down arrows in FIG. Driving force
is generated, and a speaker vibration system including the voice coil 5, the bobbin 6, the damper
7, the cone-shaped diaphragm 8, the dust cap 9, and the edge 10 vibrates in the front-rear
direction.
That is, the speaker vibration system is vibratably supported by the damper 7 and the edge 10,
and as a result, a pressure change occurs in the air existing before and after the vibration, and
the audio signal current is converted into a sound wave (sound).
[0026]
The circular cone type diaphragm 8 is a paper diaphragm formed through a paper making
process, and the bobbin 6 and the dust cap 9 are joined by an adhesive. The circular cone-shaped
diaphragm 8 is a straight cone diaphragm that forms a concave surface that spreads forward as
going from the inner circumferential side to the outer circumferential side, and its cross-sectional
shape is substantially linear, and the outer diameter of the circular cone-shaped diaphragm 8 is
The diameter is about φ19 mm, and the inner diameter is about φ13 mm. The surface on the
front side of the circular cone-shaped diaphragm 8 to which the dust cap 9 is to be joined is on
the front side and the surface on the rear side of the circular cone-shaped diaphragm 8 to which
the bobbin 6 is disposed Will be the back side.
[0027]
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9
Since the speaker 1 of the present embodiment is a small-sized electrodynamic speaker provided
with a circular cone type diaphragm 8 with a diameter of 3 cm, the voice coil diameter is relative
to the outer diameter of the circular cone type diaphragm 8 It is big. Further, as shown in the
figure, the circular cone type diaphragm 8 is covered at the center side with the dust cap 9 and
hardly exposed from the front side. In such a small dynamical type speaker, the ratio of the dust
cap 9 and the edge 10 is high while the ratio of the circular cone type diaphragm 8 occupying
the entire effective area of the speaker vibration system is high, especially the edge 10 The
material and shape of this greatly affect the sound pressure frequency characteristics to be
reproduced.
[0028]
The edge 10 is formed by heat-pressing a phenolic resin-impregnated fabric substrate (thickness:
about 0.15 mm, 75 × 1 × per inch) to thermally cure the phenolic resin and cut it It is an edge
for a speaker which is cut and formed into a substantially annular shape. The edge 10 is formed
between an inner periphery joint portion 11 joined to the outer periphery end portion of the
cone-shaped diaphragm 8, an outer periphery joint portion 12 joined to the frame 4, and the
inner periphery joint portion 11 and the outer periphery joint 12 And a movable portion 13.
[0029]
The inner periphery joint portion 11 of the edge 10 is a short cone-shaped portion joined to the
outer peripheral end of the cone-shaped diaphragm 8 and forms a concave surface which
spreads forward as going from the inner peripheral side to the outer peripheral side. It is bonded
to the outer peripheral end from the rear side of the plate 8. The inner circumferential bonding
portion 11 defining the cross-sectional shape of the inner circumferential bonding portion 11 is a
straight line, and as a result, the inner circumferential bonding portion 11 has a shape along the
straight cone shape of the circular cone type diaphragm 8. Further, the outer periphery joint
portion 12 of the edge 10 is a flat portion joined to the frame 4 and the arrow sheet 17 is
adhered to the front side of the entire periphery. Arrow 17 is a ring-shaped thick paper having a
thickness of 0.6 mm, and maintains the shape of edge 10 formed of a material having elasticity
due to its strength.
[0030]
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10
The movable portion 13 of the edge 10 is composed of a first movable portion 14 having a linear
cross-sectional shape, and a second movable portion 15 having a corrugated cross-sectional
shape. That is, the movable portion 13 is formed to extend from the inner circumferential joint
portion 11 to the outer circumferential side on the extension of the inner circumferential joint
portion 11 in the cross sectional shape, and the first movable portion 14 in the cross sectional
shape And extending from the first movable portion 14 to the outer peripheral side out of the
extension line of the first movable portion 14, and the second movable portion 15 connected to
the outer peripheral joint portion 12 with a waveform whose cross-sectional shape is bent.
[0031]
Here, the second movable portion 15 is extended so as to be substantially orthogonal to the short
cone-shaped first movable portion 14 in the cross-sectional shape of the movable portion 13, in
other words, a surface of an inverted cone shape with corrugation Form. Therefore, the movable
part ridgeline 16 defined in a substantially annular shape by the connection part of the first
movable part 14 and the second movable part 15 is formed so as to project on the most front
side of the edge 10 thereof. That is, the movable part ridgeline 16 protrudes to the front side
relative to the inner circumferential joint portion 11 and the outer circumferential joint portion
12.
[0032]
The first movable portion 14 constituting the movable portion 13 of the edge 10 is formed to
extend from the inner circumferential bonding portion 11 to the outer circumferential side on
the extension of the inner circumferential bonding portion 11 in the cross-sectional shape. That
is, the first movable portion 14 is a short cone-shaped portion obtained by extending the inner
peripheral joint portion 11 joined to the circular cone type diaphragm 8, and the boundary with
the inner peripheral joint portion 11 is the cone type diaphragm 8. It is an outer peripheral end.
In the present embodiment, the first movable portion 14 of the edge 10 has a width W1 of about
3.8 mm and an annular area S1 of the first movable portion 14 of about 236 mm <2>.
[0033]
Further, the second movable portion 15 constituting the movable portion 13 of the edge 10 is
formed so as to be separated from the extension line of the first movable portion 14 and
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11
extended from the first movable portion 14 to the outer peripheral side in the sectional shape. Be
done. That is, in the second movable portion 15, the first movable portion 14 extending to the
front side of the circular cone-shaped diaphragm 8 is bent by about 90 degrees to the rear side
of the circular cone-shaped diaphragm 8. This is a reverse cone-shaped portion extended
substantially orthogonal to the movable portion 14. In the present embodiment, the width W2 of
the cross section of the second movable portion 15 of the edge 10 is about 1.7 mm, and the
annular area S2 of the second movable portion 15 is about 135 mm <2>. The second movable
portion 15 is formed so as to have a corrugated (roll radius r of about 0.3 mm) whose section
shape is bent, that is, corrugation, and is formed so as to be flexibly deformed in the front-rear
direction. . In addition, the roll which forms the waveform in the 2nd movable part 15 should just
be about 0.1 mm or more in the radius r.
[0034]
FIG. 2 is a view for explaining the relationship between the cross-sectional shape of the movable
portion 13 of the edge 10 and the annular area, FIG. 2 (a) is a plan view, and FIG. 2 (b) is a crosssectional view. It represents a part of the edge 10 of the direction. Assuming that the inner
diameter of the first movable portion 14 is R1, the radius of the movable portion ridgeline 16
that is the connection portion between the first movable portion 14 and the second movable
portion 15 is R2, and the outer diameter of the second movable portion 15 is R3. The width W1
in the shape is equal to (R2-R1), and the width W2 in the cross-sectional shape is equal to (R3R2). In the case of the circular cone-shaped diaphragm 8, the annular area S1 of the first movable
portion 14 is π · (R2 <2> -R1 <2>), and the annular area S2 of the second movable portion 15 is
π -It is (R3 <2> -R2 <2>).
[0035]
When the width W1 of the first movable portion 14 of the edge 10 is increased, the first movable
portion 14 acts as a diaphragm that radiates a sound wave like the circular cone diaphragm 8, so
the annular area of the first movable portion 14 If S1 is increased, the upper limit frequency
characteristics can be improved. When designing the cross-sectional shape of the movable
portion 13 of the edge 10, the dimensions of the conical diaphragm 8 and the frame 4 are set,
and the inner diameter R1 of the movable portion 13 and the outer diameter R3 of the movable
portion 13 can not be changed. There are many. Therefore, the cross-sectional shape of the
movable portion 13 of the edge 10 is designed by designing the dimension R2 that determines
the widths W1 and W2 in the cross-sectional shape. In order to make the annular area S1 of the
first movable portion 14 wider than the annular area S2 of the second movable portion 15, at
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least the width W1 of the first movable portion 14 located on the inner peripheral side is located
on the outer peripheral side. It has to be larger than the width W2 of the second movable portion
15. Furthermore, when the dimensions R1 and R3 are predetermined, by determining the widths
W1 and W2 in the cross-sectional shape so as to satisfy the dimension R2> √ ((R1 <2> + R3 <2>)
/ 2), the annular area S1> The annular area S2 can be satisfied.
[0036]
FIG. 3 is a graph showing the sound pressure frequency characteristics (1 W input / 1 m on axis)
of the speaker 1 including the circular cone type diaphragm 8 with an aperture of 3 cm and the
edge 10 of this embodiment. The horizontal axis is the frequency (Hz) of the audio signal, and the
vertical axis is the sound pressure level (SPL: dB). The lowest resonance frequency f0 is about
437 Hz, and the upper limit frequency fH is about 18 kHz. A wide reproduction frequency range
is secured from the lowest resonance frequency f0 to the high frequency band limit frequency
fH, and a relatively flat characteristic without significant peak dip is obtained. Further, at the time
of 1 W input, no noise or the like is generated from the edge 10.
[0037]
FIG. 4 is a cross-sectional view for explaining a speaker 100 using the conventional speaker edge
20 as a comparative example. The speaker 100 of this comparative example is a small-sized
electrodynamic speaker provided with a circular cone type diaphragm 8 having the same
diameter of 3 cm as the speaker 1 of Example 1, and the edge 20 described later is different from
the edge 10 of Example 1. Is common to the speaker 1 of the first embodiment. Therefore, the
description of the common parts will be omitted.
[0038]
The conventional speaker edge 20 is a speaker edge which is formed into a substantially annular
shape by heat-pressing a base material of a cloth impregnated with the same phenolic resin as
the edge 10 of Example 1 and thermally curing the phenolic resin. . The edge 20 is formed
between an inner circumferential joint 21 joined to the outer circumferential end of the coneshaped diaphragm 8, an outer circumferential joint 22 joined to the frame 4, and the inner
circumferential joint 21 and the outer circumferential joint 22. And a movable portion 23. The
inner circumferential joint portion 21 is a short cone-shaped portion joined to the outer
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13
peripheral end of the conical diaphragm 8 and is bonded to the outer peripheral end from the
rear side of the conical diaphragm 8. Further, the outer circumferential joint portion 22 is a flat
portion joined to the frame 4 and the arrow sheet 17 is adhered to the front side of the entire
circumference. The movable portion 23 of the edge 20 has a roll shape with a radius of 2 mm in
cross section. Therefore, the roll edge 20 vibratably supports the speaker vibration system, and
the movable portion 23 is flexibly deformed to vibrate in the front-rear direction.
[0039]
FIG. 5 is a graph showing the sound pressure frequency characteristics (at 1 W input / on 1 m
axis) of the speaker 100 provided with the circular cone type diaphragm 8 with an aperture of 3
cm and the edge 20 of the comparative example. The lowest resonance frequency f0 is about
437 Hz, which is the same as in the case of the speaker 1 of the present embodiment, and the
high limit frequency fH is about 10 kHz, which is lower than that of the speaker 1 of the present
embodiment. Although the speaker 100 of the comparative example has such a relatively flat
characteristic with no noticeable peak dip, the high frequency limit frequency fH is lowered, and
the reproduction frequency range is higher than that of the speaker 1 of this embodiment. Is
narrow. Note that no noise or the like is generated from the edge 20 when 1 W is input.
[0040]
In addition, when the audio signal power to be applied to the speaker 1 including the edge 10 of
the present embodiment and the speaker 100 including the edge 20 of the comparative example
is increased, the speaker 100 including the edge 20 of the comparative example is approximately
While noise starts to be generated from the edge 20 at 3.0 W input, in the speaker 1 having the
edge 10 of the present embodiment, the noise starts to be generated from the edge 20 at
approximately 8.0 W input, and an input larger than in the prior art It can be seen that distortion
is less likely to occur due to signal power.
[0041]
FIG. 6 is a cross-sectional view for explaining a speaker 101 using the speaker edge 30 according
to another preferred embodiment of the present invention.
The speaker 1a of the present embodiment is a small-sized electrodynamic speaker provided with
the circular cone type diaphragm 8 having the same diameter of 3 cm as the speaker 1 of the
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embodiment 1, and the edge 30 described later is different from the edge 10 of the embodiment
1. Is common to the speaker 1 of the first embodiment. Therefore, the description of the common
parts will be omitted.
[0042]
The edge 30 for a speaker according to the present embodiment is formed by heat pressing a
base of a cloth impregnated with the same phenolic resin as the edge 10 of Example 1, heat
curing the phenolic resin, and cutting by a cutting die to form a substantially annular shape. It is
a speaker edge molded into a shape. The edge 30 has a cross-sectional shape of the movable
portion 33 different from that of the edge 10 of the first embodiment. Specifically, the second
movable portion 35 is the same as the edge 10 of the first embodiment except that the crosssectional shape of the second movable portion 35 is different. The second movable portion 35 of
the edge 30 is a stepped corrugation having no deep roll, and is formed so as to be flexibly
deformed in the front-rear direction. Since the second movable portion 35 has a stepped shape
with a width of 1.7 mm and a height of 1.7 mm (three or more steps are preferable) in crosssectional shape, the edge 30 is a combination of concave and convex shapes fitted in the front
and rear direction It is easy to mold with a mold consisting of
[0043]
FIG. 7 is a cross-sectional view illustrating a speaker 102 using a speaker edge 40 according to
another preferred embodiment of the present invention. The speaker 102 of the present
embodiment is a small dynamic electrodynamic speaker provided with the circular cone
diaphragm 48 having the same aperture 3 cm as the speaker 1 of the embodiment 1 but having a
curved cone whose cross-sectional shape is an arc. The difference from the circular cone type
diaphragm 48 and the edge 40 described later with the edge 10 of the first embodiment is the
same as the speaker 1 of the first embodiment. Therefore, the description of the common parts
will be omitted.
[0044]
The circular cone type diaphragm 48 is a paper diaphragm formed through a paper making
process, and the bobbin 6 and the dust cap 9 are joined by an adhesive. The circular cone-shaped
diaphragm 48 is a curved cone diaphragm that forms a concave surface that spreads forward as
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going from the inner peripheral side to the outer peripheral side, and its cross-sectional shape is
an arc shape with a radius R = 150 mm. The outer diameter of is about 18 mm and the inner
diameter is about 13 mm. The circular cone-shaped diaphragm 48 may be a curved cone
diaphragm molded of resin.
[0045]
The speaker edge 40 of the present embodiment is formed by heat pressing a base material of a
cloth impregnated with the same phenolic resin as the edge 10 of Example 1, heat curing the
phenolic resin, and cutting by a cutting die to form a substantially annular shape It is a speaker
edge molded into a shape. The edge 40 is different from the edge 10 of the first embodiment in
the cross-sectional shapes of the inner circumferential joint portion 41 and the movable portion
43. Specifically, the inner circumferential bonding portion 41 is an arc whose inner
circumferential shape line has a radius R substantially the same as the cross-sectional shape of
the circular cone diaphragm 48. Therefore, the first movable portion 44 constituting the movable
portion 43 is also in the shape of a circular arc of radius R. Further, the cross-sectional shape of
the second movable portion 45 is a stepped corrugation chamfered with a small roll, and
similarly to the edge 10 of the first embodiment, the second movable portion 45 is formed so as
to be flexibly deformed in the front-rear direction.
[0046]
Of course, the speaker edge of the present invention is not limited to the above embodiment, and
may have other cross-sectional shapes. Even in a large-sized speaker with a large aperture, the
movable portion of the speaker edge extends from the inner circumferential joint to the outer
circumferential side on the extension of the inner circumferential shape line defining the cross
sectional shape of the inner circumferential joint in the cross sectional shape What is necessary
is just to be comprised from the 1st movable part formed, and the 2nd movable part of the
waveform whose cross-sectional shape is bent.
[0047]
Moreover, the edge for speakers of this invention is not limited when it forms with the
lightweight edge material which impregnated the phenol resin in the base material of the cloth of
the said Example. The material for forming the speaker edge may be, for example, one obtained
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by impregnating a woven or non-woven substrate with a thermosetting resin, or one impregnated
with a thermoplastic rubber, and then heat pressing it. Further, the sheet of elastomer may be
press-molded.
[0048]
Further, the speaker diaphragm and the speaker of the present invention are not limited to the
above embodiments. The magnetic circuit is not limited to the external magnet type magnetic
circuit illustrated in the description of the present embodiment, and may be an internal magnet
type magnetic circuit or a repulsion type magnetic circuit. In addition, the cone-shaped
diaphragm is not limited to a circular shape, and may be an oval or track-shaped cone-shaped
diaphragm.
[0049]
The speaker edge according to the present invention is not limited to a speaker used for home
stereo reproduction or multi-channel surround reproduction, but can also be applied to a speaker
used for portable electronic devices or car audio devices. .
[0050]
It is a sectional view explaining a speaker using edge for speakers by a preferred embodiment of
the present invention.
(Example 1) It is a figure explaining the relationship between the cross-sectional shape of the
movable part of the edge and the annular area according to a preferred embodiment of the
present invention. (Example 1) It is a graph showing the sound pressure frequency characteristic
of the speaker by a preferred embodiment of the present invention. (Example 1) It is sectional
drawing explaining the speaker using the edge for speakers of a comparative example.
(Comparative example) It is a graph showing the sound pressure frequency characteristic of the
speaker using the edge for speakers of a comparative example. (Comparison example) It is a
sectional view explaining a speaker using a speaker edge according to another preferred
embodiment of the present invention. (Example 2) FIG. 6 is a cross-sectional view for explaining a
speaker using a speaker edge according to another preferred embodiment of the present
invention. (Example 3)
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Explanation of sign
[0051]
Reference Signs List 1 speaker 2 magnetic circuit 3 magnetic air gap 4 frame 5 voice coil 6
bobbin 7 damper 8 cone type diaphragm 9 dust cap 10 speaker edge 11 inner circumferential
joint 12 outer circumferential joint 13 movable portion 14 first movable portion 15 second
movable portion Part 16 Movable part ridge line 17 Arrow sheet 20, 30, 40 Edge for speaker 48
Cone type diaphragm 100, 101, 102 Speaker
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