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DESCRIPTION JP2008104021

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DESCRIPTION JP2008104021
PROBLEM TO BE SOLVED: To provide a damper in which stress is not concentrated on a specific
part of a support arm and is not broken, while balancing design of stress in the damper and
optimum design of resonance frequency in a speaker. SOLUTION: The damper for a speaker
according to the present invention has an inner peripheral side in which arm portions of a
plurality of support arms are connected to an outer peripheral side main arm portion in which
one end is connected to an outer peripheral connection portion and one end is connected to an
inner peripheral connection portion. A main arm portion and a main arm connecting portion
connecting the other ends of the outer peripheral side main arm portion and the inner peripheral
side main arm portion, and the centers of the outer peripheral side main arm portion and the
inner peripheral side main arm portion The center position a1 of the first arc defining the line is
located closer to the inner peripheral movable portion than the main arm connecting portion,
and the center position a2 of the second arc defining the center line of the main arm connecting
portion from the main arm connecting portion Located on the side of the outer peripheral fixing
portion. [Selected figure] Figure 1
Speaker damper and speaker using the same
[0001]
The present invention relates to a damper used for a speaker, and a speaker (typically, an
electrodynamic speaker) using the same.
[0002]
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1
In the electrodynamic speaker, a damper is provided in order to center the voice coil disposed in
the magnetic gap of the magnetic circuit at a predetermined position and to be able to vibrate
well.
The damper, by its compliance (or stiffness) and the weight of the vibration system including the
voice coil and the voice coil bobbin and the diaphragm, defines a minimum resonance frequency
f0 which defines the lower reproduction limit frequency of the electrodynamic speaker. The
damper has an inner peripheral portion joined to the voice coil bobbin and an outer peripheral
portion connected and fixed to a frame or a magnetic circuit or the like, and includes a support
movable portion connecting the inner peripheral portion and the outer peripheral portion.
Various studies have been made on the shape and material of the support movable portion of the
damper.
[0003]
BACKGROUND Conventionally, there is a damper formed by punching a metal plate of a
predetermined thickness or a resin molded plate. Such a so-called butterfly damper has an outer
peripheral fixed portion, an inner peripheral movable portion joined to the coil bobbin, and a
plurality of support arms connecting the outer peripheral fixed portion and the inner peripheral
movable portion. When there is a condition to select a plate of a predetermined thickness, the
lowest resonance frequency f0 is optimally designed, and its support to improve the linearity
between the driving force applied to the voice coil and the voice coil displacement. The shape of
the arm is variously considered. In such a damper, since the support arm does not extend, there
is a problem that when the driving force beyond the movable range of the voice coil
displacement is applied, the portion where the stress of the support arm is concentrated is
broken. .
[0004]
Conventionally, there have been attempts to solve the above problems by examining the shape of
the support arm, the material of the damper, and the like. For example, there is one in which the
shape of the support arm is asymptotically reduced in width toward the central portion rather
than at the root (Patent Document 1). Further, for example, there is one in which the crosssectional shape of the support arm is formed in a track shape, and the connection portion
between the support arm and the inner peripheral portion or the outer peripheral portion is
formed in a curved surface shape (Patent Document 2).
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[0005]
Japanese Utility Model Laid-Open Publication No. 56-68392 (FIG. 3) Japanese Patent Laid-Open
Publication No. 2002-262392 (FIG. 1)
[0006]
However, in the speaker damper of the prior art, when the overall shape of the support arm is
changed so as to prevent breakage of the portion where the stress of the support arm is
concentrated, the stiffness of the damper changes significantly, and in the speaker using this
There is a problem that the lowest resonance frequency f0 changes significantly compared to
before the change.
In addition, when the support arm vibrates and is largely displaced, the resonance frequency of
the speaker damper which is not excellent in linearity may also be largely changed. That is, if the
shape of the support arm is simply changed as in the prior art, it may be difficult to achieve both
the dispersion design of the stress in the damper and the optimum design of the resonance
frequency in the speaker.
[0007]
The present invention has been made to solve the above-described problems of the prior art, and
the object thereof relates to a damper for a speaker and a speaker using the same, and a stress
distribution design at the damper and resonance at the speaker. It is an object of the present
invention to provide a damper in which stress is not concentrated at a specific position of the
support arm to achieve both of the optimum design of the frequency.
[0008]
The speaker damper of the present invention is a speaker damper having an outer peripheral
fixed portion, an inner peripheral movable portion joined to the coil bobbin, and a plurality of
support arms connecting the outer peripheral fixed portion and the inner peripheral movable
portion. Each of the plurality of support arms includes an outer peripheral connecting portion
connected to the outer peripheral fixed portion, an inner peripheral connecting portion
connecting to the inner peripheral movable portion, and an arm portion connecting the outer
peripheral connecting portion and the inner peripheral connecting portion The arm portion
includes an outer peripheral side main arm portion having one end connected to the outer
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peripheral connecting portion, an inner peripheral side main arm portion having one end
connected to the inner peripheral connecting portion, an outer peripheral side main arm portion
and an inner peripheral side main arm A center position a1 of a first arc defining a center line of
the outer peripheral side main arm portion and the inner peripheral side main arm portion; The
main arm connecting portion is located closer to the inner peripheral movable portion The
second arc center position a2 defining the center line is located on the side of the outer
peripheral fixing portion than the main arm coupling portion.
[0009]
Preferably, in the speaker damper of the present invention, the arm portion has a main arm
connecting portion in which the radius r2 of the second arc is smaller than the radius r1 of the
first arc.
[0010]
More preferably, in the speaker damper of the present invention, the main arm connection
portion is disposed at the center of the arm portion, and the lengths of the outer peripheral side
main arm portion and the inner peripheral side main arm portion are substantially equal.
[0011]
In addition, preferably, in the speaker damper of the present invention, the outer peripheral
fixing portion has an outer peripheral side cutout portion formed at the boundary with the outer
diameter side end of the outer peripheral connecting portion, and the inner peripheral movable
portion is an inner peripheral It has an inner peripheral side notch formed in the boundary with
the inner diameter side end of a connecting part.
[0012]
Still more preferably, the speaker of the present invention is provided with the above-mentioned
speaker damper for the present invention.
[0013]
Hereinafter, the operation of the present invention will be described.
[0014]
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The speaker damper of the present invention has a substantially annular outer peripheral fixed
portion, an inner peripheral movable portion joined to the coil bobbin, and a plurality of support
arms connecting the outer peripheral fixed portion and the inner peripheral movable portion.
The speaker damper is a metal plate of a predetermined thickness or a damper formed by
punching a resin molded plate, and each of the plurality of support arms is connected to the
outer peripheral fixing portion, and the outer peripheral connection is changed in width. And an
inner peripheral connecting portion connected to the inner peripheral movable portion to change
its width, and an arm portion connecting the outer peripheral connecting portion and the inner
peripheral connecting portion.
The "width" of the support arm refers to a length orthogonal to the center line of the support
arm.
[0015]
Here, the arm portion of the support arm has an outer peripheral side main arm portion having
one end connected to the outer peripheral connecting portion, an inner peripheral side main arm
portion having one end connected to the inner peripheral connecting portion, an outer peripheral
side main arm portion, And a main arm connecting portion connecting the other ends of the
inner peripheral side main arm portions.
That is, the outer peripheral side main arm portion, the main arm connecting portion, and the
inner peripheral side main arm portion are sequentially connected to constitute the arm portion
of the support arm as going from the outer peripheral connecting portion to the inner peripheral
connecting portion. .
[0016]
In addition, the outer peripheral side main arm portion and the inner peripheral side main arm
portion, which constitute the arm portion of the support arm, and the main arm connecting
portion define center lines of the outer peripheral side main arm portion and the inner peripheral
side main arm portion. The center position a1 of the first arc to be positioned is located on the
inner peripheral movable portion side from the main arm connecting portion, and the center
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position a2 of the second arc defining the center line of the main arm connecting portion is the
outer peripheral fixed portion from the main arm connecting portion Located on the side of the
While the outer peripheral side main arm portion and the inner peripheral side main arm portion
draw a first circular arc gently bending inward toward the inner peripheral connecting portion
from the outer peripheral connecting portion, the main arm connecting portion Draw a second
arc that gently bends outward.
Therefore, in the connection portion between the main arm connecting portion and the outer
peripheral side main arm portion and the inner peripheral side main arm portion, an arm portion
connected so as to bend is formed.
[0017]
In the damper for a speaker, since stress is likely to be concentrated on the outer peripheral
connection portion and the inner peripheral connection portion constituting the support arm and
it is easily broken, in the present invention, the main arm connection portion is easily provided
on the arm portion. Stress can be dispersed.
The main arm connecting portion is connected so as to bend at the connecting portion with the
outer peripheral side main arm portion and the inner peripheral side main arm portion, so the
stress is concentrated here and the stress concentrated in the outer peripheral connecting
portion and the inner peripheral connecting portion Distribute
As a result, in the speaker using the speaker damper of the present invention, the problem of
breakage of the support arm is less likely to occur.
[0018]
For example, as the degree of bending in these connecting portions is larger, stress is
concentrated on the connecting portions. Therefore, as the arm portion has a main arm
connecting portion in which the radius r2 of the second arc is smaller than the radius r1 of the
first arc, the angle α at which the first arc intersects the second arc becomes a larger angle , The
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effect of stress dispersion is enhanced. Preferably, in the arm portion of the support arm, the
main arm connecting portion may be disposed at the center of the arm portion, and the lengths
of the outer peripheral main arm portion and the inner peripheral main arm portion may be
substantially equal.
[0019]
Even if the main arm connecting portion is provided at the center of the arm portion of the
support arm, the stiffness of the damper does not change significantly. Therefore, compared with
the conventional example which changes the whole shape of a support arm, the stiffness of a
damper does not change a lot, and also in the speaker using it, the lowest resonance frequency f0
does not change a lot compared with before a change . In addition, even when the support arm
vibrates and is largely displaced, the minimum resonance frequency f0 does not change
significantly, and a speaker damper having excellent linearity is realized. As described above, the
speaker damper of the present invention can achieve both the dispersion design of the stress in
the damper and the optimum design of the resonance frequency in the speaker.
[0020]
Furthermore, in the speaker damper of the present invention, the outer peripheral fixing portion
has an outer peripheral side cutout portion formed at the boundary with the outer diameter side
end of the outer peripheral connecting portion, and the inner peripheral movable portion is an
inner peripheral connecting portion. It has an inner circumferential cutout formed at the
boundary with the inner radial end. The outer peripheral side notch and the inner peripheral side
notch are in the shape of a small radius arc, so that the connection between the outer peripheral
fixed portion and the inner peripheral movable portion, and the support arm is made smooth.
The stress is likely to be concentrated on the outer peripheral connection portion and the inner
peripheral connection portion constituting the support arm, and the boundary with the outer
peripheral fixed portion or the inner peripheral movable portion is easily broken. Therefore, the
notch for dispersing the stress is the outer peripheral fixed portion and the inner peripheral
portion. By providing the movable portion, a problem such as breakage is less likely to occur.
[0021]
The speaker using the damper for a speaker according to the present invention can achieve both
the dispersion design of the stress in the damper and the optimum design of the resonance
frequency in the speaker, and the stress does not concentrate on a specific part of the support
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arm and does not break. A stable speaker can be obtained.
[0022]
The damper for a speaker according to the present invention can achieve both the dispersion
design of the stress in the damper and the optimum design of the resonance frequency in the
speaker, and the operation is stable with the stress not concentrated on a specific part of the
support arm The purpose of providing a speaker is that an arm portion of a plurality of support
arms has an outer peripheral side main arm portion where one end is connected to an outer
peripheral connecting portion, and an inner peripheral side main arm portion where one end is
connected to an inner peripheral connecting portion A main arm connecting portion connecting
the other ends of the outer peripheral side main arm portion and the inner peripheral side main
arm portion, and defining a center line of the outer peripheral side main arm portion and the
inner peripheral side main arm portion The center position a1 of the first arc is located closer to
the inner peripheral movable portion than the main arm connecting portion, and the center
position a2 of the second arc defining the center line of the main arm connecting portion is an
outer peripheral fixed portion from the main arm connecting portion To be located on the side
By, it was realized.
[0023]
Hereinafter, although the damper for speakers by the preferable embodiment of this invention
and the speaker using the same are demonstrated, this invention is not limited to these
embodiments.
[0024]
FIG. 1 is a view for explaining a speaker damper 1 according to a preferred embodiment of the
present invention, FIG. 1 (a) is a plan view, and FIG. 1 (b) is a stress distribution characteristic
view of a support arm 4.
The damper 1 includes an annular outer peripheral fixed portion 2, an annular inner peripheral
movable portion 3, and a plurality of support arms 4 connecting the outer peripheral fixed
portion 2 and the inner peripheral movable portion 3.
[0025]
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The speaker damper 1 is a damper formed by punching a metal plate of a predetermined
thickness or a resin molded plate.
For example, in the present embodiment, a 45 μm-thick metal plate made of titanium copper
alloy (CuT) is etched as a damper used for a small speaker.
The outer diameter of the outer peripheral fixed portion 2 of the speaker damper 1 is about 15.9
mm, and the inner diameter of the inner peripheral movable portion 3 is about 9.1 mm. In the
damper 1, each of the three support arms 4 has the same shape and is arranged at an interval of
120 degrees from the center point of the damper 1.
[0026]
Each support arm 4 of the damper 1 includes an outer peripheral connecting portion 5
connected to the outer peripheral fixed portion 2, an inner peripheral connecting portion 6
connected to the inner peripheral movable portion 3, an outer peripheral connecting portion 5
and an inner peripheral connecting portion 6. An arm unit 7 is provided to connect. The outer
periphery connecting portion 5 is a portion extending from the outer periphery fixing portion 2
in the inner peripheral direction of the damper 1 and connecting to the arm portion 7, and its
width (as described above, “width of the support arm 4 is It indicates a length orthogonal to the
center line of the support arm 4. ) Is often formed wider than the width of the arm 7 and may be
equal to the width of the arm 7 in some cases. Similarly, the inner peripheral connection portion
6 is a portion extending from the inner peripheral movable portion 3 in the outer peripheral
direction of the damper 1 and connecting to the arm portion 7, and in most cases the width
thereof is greater than the width of the arm portion 7 Are also widely formed. In particular, the
width of the outer peripheral connection portion 5 and the inner peripheral connection portion 6
where stress is easily concentrated is formed wider than the width of the arm portion 7. In the
present embodiment, the width of the arm 7 is about 0.2 to 0.4 mm.
[0027]
The outer peripheral fixed portion 2 of the damper 1 is fixed to the frame (not shown) and does
not vibrate, and the inner peripheral movable portion 3 fixed to the voice coil bobbin (not shown)
also does not vibrate in the relative relationship with the voice coil bobbin . The outer peripheral
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connecting portion 5 extending from the outer peripheral fixing portion 2 in the inner peripheral
direction of the damper 1 and the inner peripheral connecting portion 6 constitute a support arm
4 that vibrates. When the diaphragm of the speaker (not shown) using the damper 1 vibrates and
reproduces sound, the support arm 4 vibrates, and as a result, the outer peripheral connecting
portion 5, the inner peripheral connecting portion 6, and the arm Stress is applied to the part 7
and it is expressed as a stress distribution characteristic diagram as shown in FIG. 1 (b).
[0028]
In the stress distribution characteristic diagram of FIG. 1B, the stress distribution is represented
by gray shades, and the upper color portion of the bar display at the right end of FIG. The colored
portion on the side indicates that the stress is small. Further, in the stress distribution
characteristic diagram of the support arm 4 in FIG. 1B, the outer peripheral fixed portion 2 and
the inner peripheral movable portion 3 do not vibrate, so the stress distribution on the outer
peripheral fixed portion 2 and the inner peripheral movable portion 3 Only a portion close to the
connecting portion 5 and the inner circumferential connecting portion 6 is illustrated.
[0029]
The arm portion 7 of the damper 1 has an outer peripheral side main arm portion 8 having one
end connected to the outer peripheral connecting portion 5, an inner peripheral side main arm
portion 9 having one end connected to the inner peripheral connecting portion 6, and an outer
peripheral side main arm A main arm connecting portion 10 connecting the other ends of the
portion 8 and the inner peripheral side main arm portion 9; and the main arm connecting portion
10, the outer peripheral side main arm portion 8 and the inner peripheral side main arm portion
9 In the connecting portion of the, the arm portion 7 connected in a bending manner is formed.
Main arm connecting portion 10 is disposed substantially at the center of arm portion 7, and arm
portion 7 is configured such that the lengths of outer peripheral side main arm portion 8 and
inner peripheral side main arm portion 9 are substantially equal. ing.
[0030]
As shown, in the outer peripheral side main arm portion 8 and the inner peripheral side main
arm portion 9, the center position a 1 of the first arc A 1 defining the center line of these is an
inner peripheral movable portion 3 from the main arm connecting portion 10. Located on the
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side of For example, the radius r1 of the first arc A1 is about 6.4 mm. Therefore, the support arm
4 has an arm shape in which the outer peripheral side main arm portion 8 and the inner
peripheral side main arm portion 9 are gently bent toward the inner peripheral side as going
from the outer peripheral connecting portion 5 to the inner peripheral connecting portion 6 Do.
[0031]
On the other hand, in the main arm connecting portion 10, the center position a2 of the second
arc A2 defining the center line thereof is located closer to the outer peripheral fixing portion 2
than the main arm connecting portion 10. For example, the radius r2 of the second arc A2 is
about 3.0 mm, which is smaller than the radius r1 of the first arc A1. Therefore, the support arm
4 forms an arm shape that gently bends to the outer peripheral side in the main arm connecting
portion 10, and the main arm connecting portion 10, the outer peripheral side main arm 8 and
the inner peripheral side main arm 9 In the connecting portion of the, the arm portion 7
connected in a bending manner is formed. For example, in the present embodiment, an angle α1
at which the first arc A1 and the second arc A2 which define the degree of bending in these
connecting portions intersect is approximately 30 degrees. The main arm connecting portion 10
provided in the arm portion 7 disperses stress which tends to be concentrated on the outer
peripheral connecting portion 5 and a part of the inner peripheral connecting portion 6 as
described later.
[0032]
In the outer peripheral fixing portion 2, an outer peripheral side cutout portion 11 is formed at
the boundary with the outer diameter side end portion of the outer peripheral connecting portion
5. Similarly, in the inner peripheral movable portion 3, an inner peripheral side cutout portion 12
is formed at the boundary with the inner peripheral side end portion of the inner peripheral
connecting portion 6. The outer circumferential side notch 11 and the inner circumferential side
notch 12 are groove-like notches formed by a small arc of radius r3 where it can be said to be
the root portion of the support arm 4. In the present embodiment, the radius r3 is about 0.1 mm.
As will be described later, since stress is likely to be concentrated on the outer peripheral
connecting portion 5 and the inner peripheral connecting portion 6 constituting the support arm
4, the outer peripheral side cutout portion 11 and the inner peripheral side cutout portion 12
have an effect of dispersing stress. is there.
[0033]
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FIG. 2 is a view for explaining a speaker damper 21 according to another preferred embodiment
of the present invention, FIG. 2 (a) is a plan view, and FIG. 2 (b) is a stress distribution
characteristic view of the support arm 4. In the damper 21 of this embodiment, the radius r2 of
the second arc A2 defining the center line of the damper 1 of the previous embodiment and the
main arm connecting portion 10 is about 1.5 mm, and the damper 1 of the above embodiment is
It is common except that the value is smaller than that. Therefore, the outer peripheral fixed
portion 2, the inner peripheral movable portion 3, the plurality of support arms 4, the outer
peripheral connecting portion 5, the inner peripheral connecting portion 6 and the arm portion
7, and the outer peripheral side cutout portion 11 and the inner peripheral About the side notch
part 12, a common number is attached | subjected and description is abbreviate | omitted.
[0034]
In the damper 21 of FIG. 2, the radius r2 of the second arc A2 defining the center line of the
main arm connection portion 10 is a smaller value, so in the support arm 4, the main arm
connection portion 10 and the outer peripheral side main arm At a connection portion with the
portion 8 and the inner peripheral main arm portion 9, an arm portion 7 connected so as to be
sharply bent is formed. For example, an angle α2 at which the first arc A1 and the second arc A2
defining the bending condition at these connecting portions intersect is about 45 degrees in this
embodiment, and the angle α1 in the case of the damper 1 of the previous embodiment It is a
value larger than that and closer to a right angle (90 degrees). The main arm connecting portion
10 provided in the arm portion 7 disperses stress which tends to be concentrated on the outer
peripheral connecting portion 5 and a part of the inner peripheral connecting portion 6 as
described later.
[0035]
FIG. 3 is a view for explaining the speaker damper 31 as a comparative example, FIG. 3 (a) is a
plan view, and FIG. 3 (b) is a stress distribution characteristic view of the support arm 4. The
damper 31 of the comparative example is a speaker damper which is common to the damper 1
and the damper 21 of the previous embodiment except that the arm portion 7 does not have the
main arm connecting portion 10. About the common part, a common number is attached |
subjected and description is abbreviate | omitted.
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[0036]
4 is a view for explaining the speaker damper 32 as the second comparative example, FIG. 4 (a) is
a plan view, and FIG. 4 (b) is a stress distribution characteristic view of the support arm 4. As
shown in FIG. The damper 32 of the second comparative example is common to the damper 31
of the comparative example in that it does not have the main arm connecting portion 10, and
differs in that it does not have the outer peripheral side cutout 11 and the inner peripheral side
cutout 12 , It is a damper for speakers. About the part which is common in an Example or a
comparative example, a common number is attached | subjected and description is abbreviate |
omitted.
[0037]
The stress distribution characteristic diagrams of the speaker dampers 1 and 21 of the
embodiment and the comparative example and the support arms 4 of 31 and 32 will be
compared and examined. These stress distribution characteristic diagrams are obtained by
applying a load of 0.65 gram weight [gf] (from the top of the drawing to the downward direction)
to the inner peripheral movable portion 3 of the speaker damper of the example and the
comparative example. It shows the situation. In the speaker damper of the comparative example,
the portion where the maximum value of the stress distribution is observed is the outer
peripheral connecting portion 5 and the inner peripheral connecting portion 6 which are
substantially the same as the root of the support arm 4. Also, the resonance frequency f0 of the
vibration system of the speaker (not shown) using each damper is compared and studied.
[0038]
For example, in the speaker damper 32 of the second comparative example shown in FIG. 4B, the
maximum value of the stress distribution is about 81.0 [MPa], and in the shape of the speaker
damper 32 of the comparative example, stress is circumferentially connected It concentrates on
the part 5 and the inner circumference connection part 6, and this part shows that it is easy to be
broken when this damper 32 is used as a speaker. On the other hand, in the speaker damper 31
of the comparative example shown in FIG. 3 (b), the outer peripheral side cutout 11 and the inner
peripheral side cutout 12 are provided at the root of the support arm 4. The stress which tends
to be concentrated on the outer peripheral connecting portion 5 and the inner peripheral
connecting portion 6 constituting 4 is dispersed to be widely dispersed to the center side of the
arm portion 7. At this time, the maximum value of the stress distribution is reduced to about 59.9
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[MPa], and breakage is less likely to occur than the speaker damper 32 of the second
comparative example.
[0039]
On the other hand, in the speaker damper 1 of the present embodiment shown in FIG. 1B, the
support arm 4 is connected to the main arm connecting portion 10 and the outer main arm
portion 8 and the inner main arm portion 9. , The arm part 7 connected so that it might bend.
The stress tends to concentrate on the bent portion, so that the main arm connecting portion 10
has an effect of dispersing the stress concentration on the outer peripheral connecting portion 5
and the inner peripheral connecting portion 6. As a result, the stress concentrated on the outer
peripheral connecting portion 5 and the inner peripheral connecting portion 6 is widely
dispersed to the center side of the arm portion 7. At this time, the maximum value of the stress
distribution is about 59.9 [MPa], which is the same as the case of the speaker damper 31 of the
comparative example, but lower than that of the speaker damper 32 of the second comparative
example. And, since the range indicating the maximum value is expanded, the outer peripheral
connecting portion 5 and the inner peripheral connecting portion 6 constituting the support arm
4 are more difficult to break.
[0040]
Furthermore, also in the speaker damper 21 of the other embodiment shown in FIG. 2B, the
support arm 4 is a connection portion between the main arm connecting portion 10 and the
outer peripheral side main arm portion 8 and the inner peripheral side main arm portion 9 , The
arm portion 7 connected so as to bend. As a result, the stress concentrated on the outer
peripheral connecting portion 5 and the inner peripheral connecting portion 6 is widely
dispersed to the center side of the arm portion 7 as in the speaker damper 1. At this time, the
maximum value of the stress distribution is about 59.9 [MPa], which is the same as in the case of
the speaker damper 1 of this embodiment and the speaker damper 31 of the comparative
example. The damper 21 is realized to be widely dispersed to the side, and the outer peripheral
connection portion 5 and the inner peripheral connection portion 6 are less likely to break.
[0041]
[0042]
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In the speaker damper, even when the displacement of the vibration of the support arm is small
or when the support arm vibrates and is largely displaced, the minimum resonance frequency f0
does not change significantly, that is, the speaker damper having excellent linearity is preferable .
Table 1 compares the linearity of the speaker damper. (1) With respect to the lowest resonance
frequency f0 at an operating point (displacement of about 0.0 mm) at a load of 0.00 [gf], which is
a case where the displacement of the support arm's vibration is small, The change rate ((2) / (1))
of the lowest resonance frequency f0 at an operating point (displacement of about 0.6 mm) at a
load of 0.65 [gf], which is a case where is large, is shown.
[0043]
In the case of the speaker damper 31 of the comparative example due to the difference in the
operating point, the minimum when the speaker damper 1 of the present embodiment is used,
based on the fact that the lowest resonance frequency f0 rises by about 4.51%. The rate of
change of the resonance frequency f0 can be suppressed to about 3.29%. In addition, the rate of
change of the lowest resonance frequency f0 can be suppressed to about 2.83% in the case of
using the speaker damper 21 of the other embodiment having the arm portion 7 connected so as
to be more rapidly bent. . As described above, by configuring the arm portion 7 connected so as
to bend, concentration of stress distribution can be alleviated, and furthermore, the speaker
damper 1 having better linearity than that of the conventional case can be realized.
[0044]
The damper for a speaker according to the present invention is not limited to the above
embodiment, and may be a butterfly damper formed by punching a resin molded plate with a
mold. Further, each of the support arms is not limited to the same shape, and may be four or
more as long as it has two or more support arms, even if it is arranged symmetrically with
respect to the central axis defining the speaker damper Good.
[0045]
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The material and size of the speaker damper are not limited to those of this embodiment. The
number and shape of the support arm 4 can be variously designed because the shape and
positional relationship of the outer peripheral fixed portion 2 and the inner peripheral movable
portion 3 change depending on the configuration of the speaker magnetic circuit and diaphragm
using the damper. It is.
[0046]
The speaker damper of the present invention is not limited to speakers used for home stereo
reproduction or multi-channel surround reproduction, but can be applied to speakers used for
portable electronic devices and car audio devices .
[0047]
It is a figure explaining the damper 1 for speakers by preferable embodiment of this invention.
It is a figure explaining the damper 21 for speakers by other preferable embodiment of this
invention. (Example 2) It is a figure explaining the damper 31 for speakers of a comparative
example. It is a figure explaining the damper 32 for speakers of a 2nd comparative example.
Explanation of sign
[0048]
DESCRIPTION OF SYMBOLS 1, 21 Speaker damper 2 Outer peripheral fixed portion 3 Inner
peripheral movable portion 4 Support arm 5 Outer peripheral connecting portion 6 Inner
peripheral connecting portion 7 Arm portion 8 Outer peripheral side main arm portion 9 Inner
peripheral side main arm portion 10 Main arm connecting portion 11 Outer periphery Side notch
12 Inner circumferential notch 31, 32 Damper for speaker
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