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JP2005333321

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DESCRIPTION JP2005333321
PROBLEM TO BE SOLVED: To provide a magnesium edge for a speaker device to which
magnesium is applied which is lightweight and has characteristics such as high internal loss and
high rigidity, a manufacturing method thereof, and a speaker device using the magnesium edge.
SOLUTION: In a rolling process, a rolling amount per rolling operation by a rolling mill is set to 1
μm to 20 μm, and a magnesium base material is rolled by each rolling roller while being heated
by a thermostat. This produces a magnesium sheet of the desired thickness. Further, using this
magnesium sheet, a magnesium edge having an approximately Ω-shaped elastic portion is
formed. This magnesium edge is applied to a semi dome type or dome type dynamic speaker
device, and is used as a support element for supporting a semi dome type or dome type
diaphragm or the like. As a result, a high quality semi-dome type or dome type dynamic speaker
device that achieves high rigidity, high efficiency, high internal loss, low distortion and the like
can be obtained. [Selected figure] Figure 5
Method of manufacturing magnesium edge for speaker device, and speaker device
[0001]
The present invention relates to an edge for a speaker.
[0002]
The edge for the speaker plays a role of supporting a vibration system such as a diaphragm as is
well known.
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1
As a speaker edge, an edge formed as a separate body from a vibration system such as a
diaphragm is known. Such an edge is used to support a voice coil bobbin integrated type
diaphragm in which a diaphragm and a voice coil bobbin are integrally formed, or is divided into
a diaphragm and a voice coil bobbin, and these are joined later. It is suitably used as a support
for the In particular, this type of edge has the advantage of being able to select the material as it
is possible to attach it later to such an oscillating system. And as a material of the edge which
supports such a vibration system, a film-type material, cloth-type material, or rubber-type
material etc. are used suitably conventionally.
[0003]
However, an edge made of a film-based material has a small internal loss due to the
characteristics of the material. For this reason, in the speaker which uses the edge which consists
of such a film system material as a supporting element of a vibration system, the problem that
unnecessary resonance tends to occur at the time of sound reproduction may arise, and
distortion may arise.
[0004]
In addition, the edge made of a cloth-based material does not have so strong supporting force of
a vibration system or the like. For this reason, in a speaker using an edge made of such cloth
material as a supporting element of the vibration system, the vibration system etc. can not be
properly supported at the time of sound reproduction, and the reliability as a product is
impaired. There is a risk of
[0005]
Furthermore, since the edge made of a rubber-based material is generally formed thick, its
weight is heavy. For this reason, in the speaker which uses the edge which consists of such a
rubber-type material as a support element of a vibration system, the problem that a sensitivity
will fall may be produced at the time of sound reproduction.
[0006]
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In addition, the edge in which the fluorescence coloring area | region which color_is developed
with the light radiate | emitted with the illumination tool which consists of black lights is known
(for example, refer patent document 1). In addition, an electroacoustic transducer is provided by
providing a flat end at the boundary between the dome and the edge to increase the rigidity of
the bonding position where the voice coil is bonded and to suppress abnormal vibration of the
diaphragm due to natural resonance of the voice coil. It is known (see, for example, Patent
Document 2).
[0007]
JP-A-7-154894 JP-A-9-135491
[0008]
As problems to be solved by the present invention, the above-mentioned ones can be mentioned
as an example.
The present invention is a magnesium edge for a speaker device to which magnesium is applied
which has properties such as light weight and high internal loss and high rigidity and a method
of manufacturing the same, and using the magnesium edge, product reliability is high and
sensitivity is high. It is an object of the present invention to provide a speaker device that realizes
sound reproduction with little distortion.
[0009]
The invention according to claim 1 is a method of manufacturing a magnesium edge for a
speaker device, comprising: a heating step of heating a base of magnesium; and rolling the base
of the magnesium in the heated state to obtain a magnesium sheet. It is characterized by
comprising a rolling process to manufacture, and a forming process to form the edge by forming
the magnesium sheet.
[0010]
The invention according to claim 6 is a speaker device, comprising: a diaphragm; and an edge for
supporting the diaphragm, wherein the diaphragm and the edge are formed independently of
each other, and the edge is provided. Is formed of magnesium.
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[0011]
In one embodiment of the present invention, a method of manufacturing a magnesium edge for a
speaker device comprises: heating a base of magnesium; and rolling the base of magnesium in
the heated state to manufacture a magnesium sheet. It comprises a rolling process and a forming
process of forming the magnesium sheet to produce an edge.
[0012]
According to the above method for manufacturing a magnesium edge for a speaker device, it is
possible to manufacture a magnesium sheet having a predetermined thickness by heating and
rolling the base material of magnesium.
At this time, the reason for heating the magnesium base material to be rolled in the heating step
is to make it easy to roll.
And the magnesium edge of various shapes is manufactured by shape | molding the
manufactured magnesium sheet by a well-known method.
By using the magnesium edge thus obtained as a support element of a vibration system such as a
diaphragm in a speaker device, the following effects can be obtained. That is, since the
magnesium edge is small and light in density among metal-based materials, a highly efficient
speaker device can be obtained. In addition, since the magnesium edge has high thermal
conductivity and high heat dissipation, a speaker device with high input resistance can be
obtained. Further, since the magnesium edge has high rigidity, it is possible to improve the
supporting force of the diaphragm and the like. Further, since the magnesium edge is a high
internal loss, unnecessary vibration can be suppressed and distortion can be reduced at the time
of sound reproduction. Therefore, high quality sound reproduction is possible in the high
frequency band.
[0013]
In one aspect of the above-described method of manufacturing a magnesium edge for a speaker
device, the rolling process includes a process of manufacturing a magnesium sheet having a
predetermined thickness by repeating a process in which the rolling amount per one time is
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different.
[0014]
According to this aspect, in the rolling process, the rolling amount for each time can be
appropriately adjusted.
In a preferred example, the rolling amount can be 1 μm to 20 μm. And a rolling process can
manufacture a magnesium sheet from the base material of magnesium by repeating the process
from which the rolling amount for every time differs several times. Also, thereafter, by forming
this magnesium sheet, it is possible to precisely manufacture a magnesium edge for a speaker
device having a desired thickness.
[0015]
In another aspect of the above method for manufacturing a magnesium edge for a speaker
device, the predetermined thickness may be 30 μm to 100 μm. As a result, it is possible to
manufacture a magnesium edge for a high quality speaker device which is not affected by
oxidation and realizes high rigidity, high efficiency, high internal loss, low distortion and the like.
[0016]
In another aspect of the above method for manufacturing a magnesium edge for a speaker
device, the rolling amount can be 1 μm to 20 μm, and can be gradually reduced as the
magnesium sheet becomes thinner. According to this aspect, since the rolling amount per time is
in the micron unit, it is possible to effectively prevent the occurrence of defects such as cracking,
warping, or pinholes in the magnesium base material having high rigidity during rolling. And the
magnesium edge of desired thickness can be precisely manufactured. In addition, by gradually
reducing the amount of rolling per step as the base material of magnesium becomes thinner, it is
possible to prevent the occurrence of defects such as cracking, warping or pinholes in the base
material of rolled magnesium. be able to. Thus, the yield can be improved.
[0017]
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In another aspect of the present invention, a magnesium edge for a speaker device is
manufactured by the above manufacturing method and supports a diaphragm integrated with a
diaphragm or a voice coil bobbin.
[0018]
The above magnesium edge for a speaker device is light in weight, high in heat dissipation, and
has characteristics such as high rigidity and high internal loss, so that the magnesium edge is
used as a supporting element of a vibration system such as a diaphragm in the speaker device.
The following effects can be achieved.
That is, since the magnesium edge is small and light in density among metal-based materials, a
highly efficient speaker device can be obtained. In addition, since the magnesium edge has high
thermal conductivity and high heat dissipation, a speaker device with high input resistance can
be obtained. Further, since the magnesium edge has high rigidity, it is possible to improve the
supporting force of the diaphragm and the like. Further, since the magnesium edge is a high
internal loss, unnecessary vibration can be suppressed and distortion can be reduced at the time
of sound reproduction. Therefore, high quality sound reproduction is possible in the high
frequency band.
[0019]
According to another aspect of the present invention, a speaker device includes a diaphragm and
a magnesium edge which is manufactured by the above manufacturing method and supports the
diaphragm, and the magnesium edge and the diaphragm are formed independently of each other.
It is done. The speaker device further includes a diaphragm and an edge for supporting the
diaphragm, wherein the diaphragm and the edge are formed independently of each other, and
the edge is formed of magnesium. In a preferred example, the diaphragm can be formed in a
semi-dome shape or a dome shape. Further, the diaphragm can be formed integrally with the
voice coil bobbin.
[0020]
In each of the above speaker devices, a magnesium edge having characteristics such as light
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weight, high heat dissipation, high rigidity and high internal loss is used as a support element
such as a diaphragm, and therefore the following effects can be obtained. That is, since the
magnesium edge is small and light in density among metal-based materials, a highly efficient
speaker device can be obtained. In addition, since the magnesium edge has high thermal
conductivity and high heat dissipation, a speaker device with high input resistance can be
obtained. Further, since the magnesium edge has high rigidity, it is possible to improve the
supporting force of the diaphragm integrated with the diaphragm or the voice coil bobbin.
Further, since the magnesium edge is a high internal loss, unnecessary vibration can be
suppressed and distortion can be reduced at the time of sound reproduction. Therefore, high
quality sound reproduction is possible in the high frequency band.
[0021]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings. The invention applies magnesium to the edge for a speaker device. Also, the edge is
applied to the speaker device. As a result, it becomes possible to stably support a vibration
system such as a diaphragm, and it is possible to obtain a high-quality speaker device that
achieves high rigidity, high efficiency, high internal loss, low distortion, and the like.
[0022]
First, a rolling method for rolling a magnesium base having a predetermined thickness to a
desired thickness will be described. Hereinafter, a rolling method for rolling to a thickness of 30
μm to 100 μm will be described as an example.
[0023]
[Method of Rolling Magnesium Base Material] First, a method of rolling a magnesium base
material will be described with reference to FIG. FIG. 1 shows a rolling process 200 of rolling the
magnesium base 20 into a magnesium sheet 24 with a thickness of 30 μm to 100 μm.
[0024]
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The base material 20 of magnesium is formed in advance as a sheet material having a thickness
of about 150 μm. In the rolling process 200, the magnesium base material 20 is repeatedly
rolled a plurality of times by the rolling mill 23, whereby a magnesium sheet 24 having a desired
thickness in the range of 30 μm to 100 μm is manufactured (see arrow s6).
[0025]
The rolling mill 23 rolls the magnesium base material 20 to a predetermined thickness while
applying a constant tension while rotating in a predetermined direction, and the magnesium base
material 20 is set to a predetermined thickness. And a constant temperature bath 22 for heating
to a temperature.
[0026]
The rolling rollers 21a, 21b, 21c and 21d can be adjusted to a constant tension through a tension
adjusting mechanism (not shown).
The tension adjustment mechanism is adjusted to a constant tension by an operator or the like
operating the operation panel. In this example, the rolling rollers 21a, 21b, 21c and 21d can thin
the magnesium base 20 within a range of about 1 to 20 μm by rolling each time.
[0027]
The constant temperature bath 22 is a device for heating the magnesium base 20 to a
predetermined temperature, and the inside thereof is controlled to a constant temperature by a
temperature controller (not shown). Since magnesium is a close-packed hexagonal crystal,
processing at normal temperature is difficult. For this reason, it rolls, heating at about 200-400
degreeC normally with the thermostat 22. FIG. As a result, the magnesium base material 20 that
is not easily plastically deformed is easily rolled.
[0028]
The flow of the rolling process 200 will be described. First, a magnesium base material 20 having
a certain thickness and length is delivered to the rolling mill 23 by a delivery device (not shown)
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(arrow s1). Next, while rolling rollers 21a and 21b rotate in a fixed direction (arrows s2 and s3),
the base 20 of magnesium is rolled to a predetermined thickness, and the base 20 of magnesium
is introduced into the constant temperature bath 22. And send out. The magnesium base material
20 is heated to a predetermined temperature while passing through the constant temperature
bath 22 and is easily plastically deformed. Next, when the base material 20 of magnesium is fed
from the constant temperature bath 22 to the rolling rollers 21c, 21d, the rolling rollers 21c, 21d
rotate in a fixed direction (arrows s4 and s5), the base material 20 of magnesium Rolled again.
After the rolling process 200 described above, the magnesium base 20 finally becomes a
magnesium sheet 24 having a thickness in the range of 30 μm to 100 μm (arrow s6).
[0029]
In this example, when rolling the base material 20 of magnesium as mentioned above, although
the rolling amount per time is made into the range of about 1-20 micrometers, this is based on
the following reasons. That is, the magnesium material is a material that is less likely to be
plastically deformed because the amount of sliding deformation is very small compared to other
metals. For this reason, if the rolling amount to be rolled at one time is too large, problems such
as cracking, warping, or pinholes occur in the magnesium base 20 due to the influence of
residual strain latent in the magnesium base 20. It leads to the fall of the yield. Therefore, in this
example, the rolling amount per one time is reduced to about 1 to 20 μm, and the above
problem is eliminated by rolling the magnesium base material 20 a plurality of times to improve
the yield.
[0030]
Next, an example of a rolling method when rolling the magnesium base material 20 in the rolling
process 200 will be described with reference to the table shown in FIG. An example of the rolling
method at the time of rolling the base material 20 of magnesium to thickness of 150
micrometers-> 100 micrometers is shown by Fig.2 (a) (rolling method example 1). An example of
the rolling method at the time of rolling the base material 20 of magnesium to thickness of 150
micrometers-> 30 micrometers is shown by FIG.2 (b) (rolling method example 2).
[0031]
In the rolling method example 1 shown in FIG. 2A, a magnesium base having a thickness of 150
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μm is obtained through three steps of steps of 150 μm → 130 μm, 130 μm → 120 μm, and
120 μm → 100 μm. The material 20 is finally made 100 μm thick. The above three steps are
all performed by the above-described rolling step 200.
[0032]
In the first step of setting 150 μm to 130 μm, the tension of the rolling rollers 21a, 21b, 21c,
and 21d is adjusted to make the rolling amount of the magnesium base material 20 for each time
4 μm. Then, by repeatedly rolling the magnesium base material 20 five times with the rolling
mill 23, the magnesium base material 20 has a thickness of 130 μm.
[0033]
In the next process of setting 130 μm to 120 μm, the rolling amount of the magnesium base
material 20 is set to 2 μm each time, and the magnesium base material 20 is repeatedly rolled
five times by the rolling mill 23. As a result, the magnesium base 20 has a thickness of 120 μm.
[0034]
In the final step of 120 μm → 100 μm, the rolling amount of the magnesium base material 20
is made 1 μm each time, and the magnesium base material 20 is repeatedly rolled 20 times by
the rolling mill 23. As a result, the magnesium base 20 has a thickness of 100 μm.
[0035]
As mentioned above, in the rolling method example 1 by Fig.2 (a), the magnesium sheet 24 which
has a thickness of 100 micrometers is obtained by rolling the base material 20 of magnesium
with a different rolling amount a total of 30 times.
[0036]
Next, in the rolling method example 2 shown in FIG. 2B, it has a thickness of 150 μm through
three steps of a step of 150 μm to 80 μm, a step of 80 μm to 40 μm, and a step of 40 μm to
30 μm. The magnesium base 20 is finally made to a thickness of 30 μm.
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[0037]
In the first step of 150 μm → 80 μm, the rolling amount of the magnesium base 20 is set to 5
μm, and the magnesium base 20 is repeatedly rolled 14 times by the rolling mill 23.
As a result, the magnesium base 20 has a thickness of 80 μm.
[0038]
In the next step of 80 μm → 40 μm, the rolling amount of the magnesium base material 20 is
set to 2 μm each time, and the magnesium base material 20 is repeatedly rolled 10 times by the
rolling mill 23.
As a result, the magnesium base 20 has a thickness of 40 μm.
[0039]
In the final step of 40 μm → 30 μm, first, the rolling amount of the magnesium base 20 is set
to 3 μm, and the magnesium base 20 is repeatedly rolled twice by the rolling mill 23. As a
result, the magnesium base 20 has a thickness of 34 μm. Next, the amount of rolling of the
magnesium base material 20 for each time is 2 μm, and the magnesium base material 20 is
rolled once by the rolling mill 23. As a result, the magnesium base 20 has a thickness of 32 μm.
Finally, the amount of rolling of the magnesium base material 20 at each time is 1 μm, and the
magnesium base material 20 is repeatedly rolled twice by the rolling mill 23. As a result, the
magnesium base 20 has a thickness of 30 μm.
[0040]
As mentioned above, in the rolling method example 2 shown in FIG.2 (b), the magnesium sheet
24 which has a thickness of 30 micrometers is obtained by rolling the base material 20 of
magnesium with a total of 29 times by a different rolling amount.
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[0041]
In Examples 1 and 2 of the rolling method described above, the rolling amount of each rolling is
reduced as it comes to the post-process, but this is because of the following reasons.
That is, the thickness of the magnesium base 20 is reduced each time it is rolled, which causes
the rigidity of the magnesium base 20 to be reduced, so that defects such as cracks are likely to
occur. For this reason, in the three-step process shown in FIGS. 2A and 2B, the rolling amount is
reduced in the later steps to avoid the occurrence of the above-mentioned problems.
[0042]
The rolling method examples 1 and 2 shown in FIGS. 2 (a) and 2 (b) are merely examples, and the
rolling method and the rolling amount per one operation are not limited to this.
[0043]
By forming the magnesium sheet 24 thus obtained into various shapes by a known method, a
magnesium edge having a thickness of 30 μm to 100 μm supporting the vibration system of
the speaker device is manufactured.
Here, FIG. 3 shows an example of the magnesium edge 2 having an approximately Ω-shaped
elastic portion manufactured by forming a magnesium sheet 24 having a predetermined
thickness by a known method. 3 (a) shows a plan view of the magnesium edge 2, and FIG. 3 (b)
shows a cross-sectional view of the magnesium edge 2 in FIG. 3 (a) along the cutting line AA '. .
The magnesium edge 2 shown in this example is generally referred to as "free edge". The
magnesium edge 2 has an opening 2d for inserting a voice coil bobbin (not shown), and further
includes an outer peripheral edge 2a, an elastic portion 2b, and an inner peripheral edge 2c. The
outer peripheral edge 2a is attached to a frame (not shown), and the inner peripheral edge 2c is
attached to a diaphragm (not shown) or the like. The elastic portion 2 b has a substantially Ω
shape in cross section, and has a function of movably supporting a vibration system such as a
diaphragm in the axial direction of the speaker device.
[0044]
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As described above, in the present invention, in particular, magnesium is used as the material of
the edge, and therefore, the following unique effects and advantages are exhibited. Here, FIG. 4A
shows the respective characteristic values of the metal-based material containing magnesium, the
resin-based material, the rubber-based material, and the cloth-based material as Table 1. In Table
1, polyether imide (abbr .; PEI) is mentioned as a resin material and butyl rubber is mentioned as
an example of a rubber material. Further, in Table 1, Young's modulus, density, internal loss,
sound velocity, and stiffness values at a thickness of 30 μm are listed as characteristic values.
Moreover, each heat conductivity of aluminum, titanium, and magnesium is shown as Table 2 in
FIG.4 (b). In Table 2, each thermal conductivity is a value at the temperature of 27 ° C.
[0045]
First, the densities (Kg / m <3>) of the metal-based material, the resin-based material, the rubberbased material, and the cloth-based material are compared. As shown in Table 1, it is understood
that the density of the metal-based material is higher than the density of each of the resin-based
material, the rubber-based material and the cloth-based material in terms of the characteristics of
the material. Next, in the metal-based materials shown in Table 1, the titanium, aluminum and
magnesium densities are compared: 4400 (Kg / m <3>) for titanium and 2680 (Kg / m <3>) for
aluminum And magnesium is 1710 (Kg / m <3>). Accordingly, it is understood that magnesium is
smaller in density and lighter than titanium and aluminum. Therefore, when comparing the
efficiency of a speaker device having a magnesium edge with the efficiency of a speaker device
having an edge made of titanium or aluminum having the same thickness as that of the
magnesium edge, the former has higher efficiency than the latter. Also, the former can improve
the sound responsiveness more than the latter. At this time, the diaphragms used for the
respective speaker devices are made of the same material or the like.
[0046]
Next, the Young's moduli (N / m <2>) of the metal-based material, the resin-based material, the
rubber-based material, and the cloth-based material are compared. As shown in Table 1, it can be
seen that the Young's modulus of the metal-based material is larger than that of each of the
resin-based material, the rubber-based material and the cloth-based material. Next, in the metalbased materials shown in Table 1, when comparing the Young's moduli (N / m <2>) of titanium,
aluminum and magnesium, titanium is 1.19 × 10 <11> (N / m <2) >), Aluminum is 6.93 × 10
<10> (N / m <2>), and magnesium is 2.90 × 10 <10> (N / m <2>). Therefore, magnesium has a
Young's modulus smaller than aluminum and titanium. However, since magnesium has a higher
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Young's modulus than a resin-based material or the like, a speaker device using a magnesium
edge as a supporting element of a vibration system can reproduce sound up to a high range.
[0047]
Next, internal losses (tan δ) of the metal-based material, the resin-based material, the rubberbased material, and the cloth-based material are compared. As shown in Table 1, the internal loss
of the metal-based material is smaller than each internal loss of the resin-based material, the
rubber-based material, and the cloth-based material. In the metal-based materials shown in Table
1, comparing internal losses (tan δ) of titanium, aluminum and magnesium, titanium is 0.003,
aluminum is 0.0032, and magnesium is 0.0048. Thus, it can be seen that magnesium has a
higher internal loss than titanium and aluminum. For this reason, in the speaker device using the
magnesium edge as a supporting element of the vibration system, unnecessary vibration can be
suppressed at the time of sound reproduction, and distortion can be reduced.
[0048]
Next, the velocities of sound (m / s) of the metal-based material, the resin-based material, the
rubber-based material, and the cloth-based material are compared. As shown in Table 1, it is
understood that the sound velocity of the metal-based material is larger than the sound velocities
of the resin-based material, the rubber-based material and the cloth-based material. Next, in the
metal-based materials shown in Table 1, when the respective sound speeds (m / s) of titanium,
aluminum and magnesium are compared, titanium is 5200 (m / s) and aluminum is 5085 (m / s)
Magnesium is 4120 (m / s). Thus, magnesium has a lower sound velocity than titanium and
aluminum. However, since the sound velocity of magnesium is larger than that of a resin-based
material or the like, in the speaker device using the magnesium edge as a supporting element of
the vibration system, the response of the sound is fast and the high frequency characteristic
becomes good.
[0049]
Next, the respective stiffness values of the metal-based material, the resin-based material, the
rubber-based material, and the cloth-based material at a thickness of 30 μm are compared. First,
in the metal-based materials shown in Table 1, titanium is 3.21 × 10 <-3>, aluminum is 1.87 ×
10 <-3>, and magnesium is 7.83 × 10 <3>. -4>. Therefore, among metal-based materials, the
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stiffness value of magnesium is the lowest. However, when the stiffness value of magnesium is
compared with the stiffness values of the resin-based material, the rubber-based material and the
cloth-based material, it is understood that the stiffness value of the former magnesium is larger
than the respective stiffness values of the latter. Therefore, the speaker device using the former
magnesium edge as a supporting element of the vibration system improves the supporting force
of the vibration system as compared with the speaker device using the edge made of each
material of the latter as a supporting element of the vibration system. Can be In other words,
even when the thickness of the magnesium edge is made thinner to some extent than the
thickness of the edge using resin, rubber and cloth materials, the former supports the vibration
system with substantially the same strength as the latter. Can. Thus, the reliability of the speaker
device as a product can be improved.
[0050]
Next, thermal conductivity of titanium, aluminum and magnesium in metal-based materials is
compared. As shown in Table 2, the thermal conductivity of titanium is 21.9 W · m <−1> · K
<−1>, and the thermal conductivity of aluminum is 237.0 W · m <−1> · K <− It is 1>, and the
heat conductivity of magnesium is 156.0W * m <-1> * K <-1>. Thus, it can be seen that
magnesium has the highest thermal conductivity next to aluminum and high heat dissipation.
Further, since magnesium is a metal material, heat dissipation is higher than resin-based
materials, rubber-based materials and cloth-based materials. Therefore, in the speaker device in
which the magnesium edge is used as a support element of the vibration system, the limit value
of the input resistance can be set high. That is, a speaker device with high input resistance can be
obtained.
[0051]
In Tables 1 and 2, as a result of comparing each characteristic value of each material, there are
also characteristic values in which magnesium is inferior to other materials. However,
considering the overall balance of each characteristic value, it can be said that magnesium is
most suitable as the material of the edge.
[0052]
[Speaker Device for High Frequency Reproduction Using Magnesium Edge] FIGS. 5 and 6 show
various embodiments in which the above-described magnesium edge 2 is applied to a dynamic
type speaker device capable of high frequency reproduction.
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[0053]
(Example of Application to Semi-Dome Type Dynamic Speaker Device) FIG. 5 (a) shows the
magnesium integrated with the bobbin integrated semi-dome diaphragm 1 in which the
diaphragm 1a having a semi-dome shape and the voice coil bobbin 1b are integrated. FIG. 2
shows a cross-sectional view of a dynamic speaker device 50 with the edge 2 attached.
[0054]
First, the basic configuration and basic principle of the semi-dome type dynamic speaker device
50 will be briefly described with reference to FIG. 5 (a).
A semi-dome type dynamic speaker device 50 includes a vibration system including a bobbin
integrated semi-dome diaphragm 1, a voice coil 3, and a frame 4, and a magnetic circuit system
including a pot yoke 5, a magnet 6, and a plate 7. ing.
[0055]
The frame 4 has a substantially bowl-like shape in cross section, and has a function of supporting
various components of the speaker device 50.
On the bottom of the frame 4, a pot yoke 5 is fixed. A magnet 6 having a substantially disc shape
is fixed on the bottom surface of the pot yoke 5 and a plate 7 having a substantially disc shape is
fixed on the magnet 6.
[0056]
The bobbin integrated semi-dome diaphragm 1 is formed by integrating a diaphragm 1a and a
voice coil bobbin 1b. The diaphragm 1 a is a substantially semi-spherical (so-called semi-dome
shaped) diaphragm having an opening on the magnetic circuit side, and is formed independently
of the magnesium edge 2. Various materials such as magnesium can be applied to the diaphragm
1a. The voice coil bobbin 1b has a substantially cylindrical shape. The voice coil 3 is wound
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around the outer peripheral wall of the lower end portion of the voice coil bobbin 1b. The outer
peripheral wall of the lower end portion of the voice coil bobbin 1b is opposed to the inner
peripheral wall of the upper end portion of the pot yoke 5 at a predetermined interval. On the
other hand, the inner peripheral wall of the lower end portion of the voice coil bobbin 1b is
opposed to the outer peripheral walls of the magnet 6 and the plate 7 at a constant interval.
Thus, a magnetic gap (not shown) is formed between the outer peripheral wall of the plate 7 and
the inner peripheral wall of the pot yoke 5.
[0057]
The inner peripheral edge portion 2c of the magnesium edge 2 is attached to the outer
peripheral wall of the upper end portion of the voice coil bobbin 1b. On the other hand, the lower
surface of the outer peripheral edge 2 a of the magnesium edge 2 is mounted on a flange formed
on the upper end of the frame 4. Thus, the magnesium edge 2 can support the bobbin integrated
semi-dome diaphragm 1 movably and stably in the axial direction of the speaker device 50.
[0058]
In the semi-dome type dynamic speaker device 50 configured as described above, when the voice
current flows in the voice coil 3 in a uniform magnetic field, the bobbin integrated semi-dome
diaphragm 1 is the speaker device according to the principle of electromagnetic action. It
vibrates in the axial direction of 50 and emits sound waves.
[0059]
The following effects can be obtained by using the magnesium edge 2 which is light in weight,
high in heat dissipation, high in rigidity and high in internal loss, etc. as a supporting element of
the bobbin integrated semi-dome diaphragm 1.
That is, since the magnesium edge 2 is small and light in density among metal-based materials, a
highly efficient speaker device can be obtained. In addition, since the magnesium edge 2 has high
thermal conductivity and high heat dissipation, a speaker device with high input resistance can
be obtained. Further, since the magnesium edge 2 has high rigidity, the supporting force of the
bobbin integrated semi-dome diaphragm 1 can be improved. Further, since the magnesium edge
2 is a high internal loss, unnecessary vibration can be suppressed and distortion can be reduced
at the time of sound reproduction. Therefore, high quality sound reproduction is possible in the
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high frequency band.
[0060]
Next, the configuration of the dynamic speaker device 60 will be briefly described with reference
to FIG. FIG. 5 (b) shows a cross-sectional view of the dynamic type speaker device 60 in a state
where the magnesium edge 2 is attached to the diaphragm 11 in which the diaphragm 11 having
a semi dome shape and the voice coil bobbin 13 are separately formed. In the following, the
description of the same configuration as that of the above-described speaker device 50 will be
omitted.
[0061]
In the dynamic speaker device 60, the diaphragm 11 having a semi dome shape and the voice
coil bobbin 13 having a substantially cylindrical shape are separately formed, and they are
integrated through an adhesive or the like. The inner peripheral edge 2c of the magnesium edge
2 is attached to the outer peripheral edge of the diaphragm 11, and the outer peripheral edge 2a
of the magnesium edge 2 is attached to a flange formed on the upper end of the frame 4 There is.
Thus, the magnesium edge 2 can support the diaphragm 11 and the like movably and stably in
the axial direction of the speaker device 60.
[0062]
As described above, by using the magnesium edge 2 which is light in weight, high in heat
dissipation, and has characteristics such as high rigidity and high internal loss as a support
element such as the diaphragm 11, substantially the same effect as the dynamic type speaker
device 50 described above You can get
[0063]
(Example of Application to Dome-Shaped Dynamic Speaker Device) First, the configuration of the
dynamic speaker device 70 will be briefly described with reference to FIG. 6 (a).
FIG. 6A is a cross-sectional view of the dynamic speaker device 70 in a state where the
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magnesium edge 2 is attached to the bobbin integrated dome diaphragm 14 in which the
diaphragm 14a having a dome shape and the voice coil bobbin 14b are integrated. Indicates In
the following, the description of the same configuration as that of the above-described speaker
device 50 will be omitted.
[0064]
The dynamic speaker device 70 has a bobbin integrated dome diaphragm 14 and a magnesium
edge 2 or the like. The bobbin integrated dome diaphragm 14 is formed by integrating a
diaphragm 14a and a voice coil bobbin 14b. The inner peripheral edge 2c of the magnesium
edge 2 is attached to the outer peripheral wall of the upper end of the voice coil bobbin 14b, and
the outer peripheral edge 2a of the magnesium edge 2 is attached to a flange formed on the
upper end of the frame 4 ing. Thus, the magnesium edge 2 can support the bobbin integrated
dome diaphragm 14 movably and stably in the axial direction of the speaker device 70.
[0065]
As described above, by using the magnesium edge 2 which is light in weight, high in heat
dissipation, high in rigidity and high in internal loss as a supporting element of the bobbin
integrated dome diaphragm 14, the above-mentioned dynamic type speaker device 50 is
substantially Similar effects can be obtained.
[0066]
Next, the configuration of the dynamic speaker device 80 will be briefly described with reference
to FIG.
FIG. 6 (b) shows a cross-sectional view of the dynamic type speaker device 80 in a state where
the magnesium edge 2 is attached to the diaphragm 15 in which the diaphragm 15 having a
dome shape and the voice coil bobbin 16 are separately formed.
[0067]
In the dynamic speaker device 80, the diaphragm 15 having a dome shape and the voice coil
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bobbin 16 having a substantially cylindrical shape are separately formed, and they are integrated
through an adhesive or the like. The inner peripheral edge 2 c of the magnesium edge 2 is
attached to the outer peripheral edge of the diaphragm 15, and the outer peripheral edge 2 a of
the magnesium edge 2 is attached to a flange formed on the upper end of the frame 4 There is.
Thus, the magnesium edge 2 can support the diaphragm 15 and the like movably and stably in
the axial direction of the speaker device 80.
[0068]
As described above, substantially the same effect as the above-described dynamic type speaker
device 50 can be obtained by using the magnesium edge 2 which is light in weight, high in heat
dissipation, high in rigidity and high in internal loss as a supporting element You can get
[0069]
[Modification] In the above embodiment, the magnesium edge 2 having the elastic portion 2 b
having a substantially Ω shape is taken as an example, and the magnesium edge 2 having such a
form is applied to the dynamic speaker devices 50 to 80.
Not limited to this, a flat type edge formed by molding the magnesium sheet 24 by a known
method may be applied to the dynamic type speaker devices 50 to 80. Here, FIG. 7 schematically
shows a flat-type edge made of magnesium (hereinafter, referred to as “flat-type magnesium
edge 12”). 7 (a) shows a plan view of the flat magnesium edge 12, and FIG. 7 (b) is a cross
sectional view along the cutting line B-B 'of the flat magnesium edge 12 in FIG. 7 (a). Indicates
The flat magnesium edge 12 shown in FIG. 7 has an opening 12a for inserting a voice coil
bobbin, and the inner peripheral edge thereof is attached to a diaphragm or the like, and the
outer peripheral edge thereof is attached to a frame. Thus, the flat magnesium edge 12 can
support the diaphragm or the like freely and stably in the axial direction of the speaker device.
[0070]
Therefore, by using the flat magnesium edge 12 which is light in weight, high in heat dissipation,
and has characteristics such as high rigidity and high internal loss as a supporting element such
as a diaphragm, substantially the same as the above-mentioned dynamic type speaker device 50
You can get the effect. In addition to this, edges formed by forming the magnesium sheet 24 into
various shapes may be applied to the dynamic speaker devices 50 to 80. Thereby, the same
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effect as the above-described dynamic type speaker device 50 can be obtained.
[0071]
Further, in the above description, the edges of the magnesium edge 2, the flat type magnesium
edge 12 or various shapes made of magnesium are applied to the dynamic speaker device 50 to
80 for high-pitched sound reproduction having a semi-dome type or dome type diaphragm.
However, instead of this, it is also possible to apply an edge of various shapes made of
magnesium edge 2, flat type magnesium edge 12 or magnesium to a speaker device for
reproducing a low frequency sound having a cone type diaphragm.
[0072]
The rolling process which rolls the base material of magnesium concerning this invention, and
manufactures a magnesium sheet is shown.
The various examples of the rolling process of the base material of magnesium which concerns
on this invention are shown. The top view etc. of the magnesium edge which has an elastic part
of substantially omega shape which concerns on this invention are shown. It is a graph which
shows the characteristic value of each material of metal type, resin type, rubber type, and cloth
type. An example which applied a magnesium edge to a semi dome type dynamic type speaker
apparatus as a support element of a vibration system is shown. An example is shown in which a
magnesium edge is applied as a supporting element of a vibration system to a dome-shaped
dynamic speaker device. The top view etc. of the flat type magnesium edge applicable to this
invention are shown.
Explanation of sign
[0073]
Reference Signs List 1 bobbin integrated semi-dome diaphragm 2 magnesium edge 12 flat
magnesium edge 11, 15 diaphragm 13, 16 voice coil bobbin 14 bobbin integrated dome
diaphragm 20 base material of magnesium 24 magnesium sheet 22 thermostatic bath 23 rolling
mill 200 rolling process 50 , 60 semi-dome type dynamic type speaker device 70, 80 dome type
dynamic type speaker device
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