close

Вход

Забыли?

вход по аккаунту

?

JP2002345080

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2002345080
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
component for a speaker, in particular to a component of a vibration system and a method of
manufacturing the same.
[0002]
Generally, as a vibration system component, a component such as an edge for supporting a
diaphragm is used in a speaker.
[0003]
Since this edge directly affects the operation of the diaphragm with respect to the vibration
system parts of this speaker, for example, the edge, the extra vibration of the diaphragm is
absorbed and the linearity is excellent, the high internal Severe conditions are required, such as
having losses, having the necessary strength and being lightweight.
[0004]
Conventionally, in order to reduce the weight of the vibration system of the speaker, a foam
rubber material mainly made of SBR (styrene-butadiene-rubber) or EPDM (ethylene-propyleneethylene norbornene) is used for such a speaker edge. It is done.
[0005]
11-05-2019
1
However, the foamed rubber edge molded by such a foamed rubber material has a problem that
the strength and rigidity are lower than the edge molded by solid rubber, and furthermore, the
SBR-based foamed rubber edge has low temperature resistance and The light resistance is poor,
and the EPDM foam rubber edge has a problem that internal loss is low and it is difficult to
obtain good frequency characteristics.
[0006]
For this reason, the conventional foamed rubber edge has a problem that it is difficult to apply it
to high-power speakers or in-vehicle speakers where the usage environment is severe.
[0007]
The present invention has been made to solve the problems of the above-described vibrationbased parts for speakers formed of the conventional foamed rubber material.
That is, an object of the present invention is to provide a vibration system component for a
speaker that is easy to apply to a high power speaker or an on-vehicle speaker.
[0008]
In order to achieve the above object, the speaker component according to the first invention is
characterized in that it is foam-molded by a rubber mixture in which 10% by weight or more of
polynorbornene rubber is mixed. There is.
[0009]
The speaker component according to the first aspect of the invention is manufactured by
foaming a rubber mixture in which 10% by weight or more of polynorbornene rubber is mixed,
thereby reducing the weight of the component and thereby reducing the weight of the vibration
system of the speaker. Because the output sound pressure of the speaker can be increased.
[0010]
Furthermore, since the polynorbornene rubber mixed in this rubber mixture is strong even if it is
foamed and is excellent in environmental resistance, foaming to high-power speakers and carmounted speakers, which was conventionally difficult. It can enable the application of rubber
parts, and because this polynorbornene rubber can suppress the extra vibration of the speaker's
11-05-2019
2
diaphragm and the resonance of the parts themselves due to the large internal loss of the
material, It is possible to make it possible to produce a speaker excellent in sound quality with
flat frequency characteristics.
[0011]
A speaker component according to a second aspect of the invention is characterized in that, in
addition to the configuration of the first aspect of the invention, the speaker edge is foam-molded
by the rubber mixture in order to achieve the above object.
[0012]
By this, even when the edge supporting the diaphragm of the speaker is made of foam rubber, its
strength and environmental resistance can be maintained.
[0013]
A speaker component according to a third invention is characterized in that, in addition to the
constitution of the first invention, the rubber mixture is a mixture of polynorbornene rubber and
isobutylene-isoprene rubber in order to achieve the above object. .
[0014]
The speaker component according to the third aspect of the present invention has excellent
internal loss characteristics as a result of the polynorbornene rubber being mixed with the
rubber mixture as the base material, and the isobutylene-isoprene rubber being mixed. It can
have a large Young's modulus.
[0015]
In the speaker component according to the fourth invention, in order to achieve the above object,
in addition to the constitution of the first invention, the rubber mixture is a mixture of
polynorbornene rubber and ethylene-propylene-ethylene norbornene, styrene-butadiene rubber.
It is characterized by being.
[0016]
In the speaker component according to the fourth aspect of the present invention, the light
resistance of the speaker component is improved by mixing ethylene-propylene-ethylene
norbornene (EPDM) in the rubber mixture, and the styrene-butadiene rubber is mixed. Thus, the
viscosity adjustment of the base material is performed.
11-05-2019
3
[0017]
A speaker component according to a fifth invention is characterized in that, in addition to the
constitution of the first invention, fibers are mixed with the rubber mixture in order to achieve
the above object.
[0018]
The mixture of fibers in this rubber mixture increases the rigidity of the speaker component,
thereby suppressing abnormal movement of the vibration system of the speaker and allowing the
manufacture of a more reliable speaker. .
[0019]
In order to achieve the above object, the speaker component according to the sixth invention is
characterized in that, in addition to the constitution of the first invention, the fibers are oriented
in a required direction in the rubber mixture.
Thereby, the rigidity in the direction in which the fibers of the speaker component are oriented is
enhanced.
[0020]
In the speaker component according to the seventh invention, in order to achieve the above
object, in addition to the constitution of the first invention, the fibers mixed with the rubber
mixture may be aramid fibers, liquid crystal polymer fibers, acrylic fibers, metals It is
characterized in that the fiber is one or more of fibers, ceramic fibers, silicon carbide fibers,
boron fibers, amorphous fibers, fluorine fibers, acetate fibers, and silk fibers.
Thereby, the rigidity in the direction in which the fibers of the speaker component are oriented is
enhanced.
[0021]
11-05-2019
4
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The most preferable embodiment
of the present invention will be described below by taking an edge which is a vibration system
component for a speaker as an example.
[0022]
The speaker edge in this embodiment is formed of foamed rubber in which a rubber mixture
containing 10% by weight or more of polynorbornene rubber is foamed.
[0023]
As this rubber mixture, as described later, one obtained by adding polynorbornene rubber to IIR
(isobutylene-isoprene-rubber) 60 °, or EPDM (ethylene-propylene-ethylene norbornene) and
SBR (styrene-) to polynorbornene rubber Some are mixed with butadiene-rubber).
[0024]
This polynorbornene rubber has features of high strength and high internal loss, and further
retains its strength even when foamed, and has features of excellent environmental resistance
such as cold resistance and light resistance. It is what you have.
[0025]
This polynorbornene rubber is obtained by ring-opening polymerization of norbornene obtained
by synthesizing ethylene and cyclopentadiene by Diels-Alda reaction (diene synthesis) as shown
in FIG. 1, as shown in FIG. A polymer obtained, which is used as a rubber material with controlled
visco-elastic properties, in particular damping and elastic properties, by the addition of aromatic
or medium viscosity naphthenic oils or by the addition of paraffinic or low viscosity naphthenic
oils Is possible.
[0026]
Also, FIG. 3 is a graph showing the temperature dependency of loss loss (tan θ) of
polynorbornene rubber, and when compared with single-piece SBR and IIR, polynorbornene
rubber has another property at 0 ° C. or higher. It can be seen that it has a loss factor greater
than that of the material.
[0027]
The base material for forming the speaker edge according to the present invention is formed by
adding 10% by weight or more of polynorbornene rubber having such characteristics to other
11-05-2019
5
rubber materials.
[0028]
When the addition amount of this polynorbornene rubber is 10 weight percent or more, when
the addition amount is 10 weight percent or less, the characteristics of the other rubber
materials to be mixed become dominant, and the polynorbornene rubber It is because the
characteristics of high internal loss and high tensile strength can not be exhibited.
[0029]
As an example of the base material of the speaker edge to which this polynorbornene rubber is
added, one having 10 weight percent of polynorbornene rubber added and foamed at IIR 60 °
can be mentioned.
The solid rubber in which 10% by weight of polynorbornene rubber is added to this IIR 60 ° has
the same internal loss tan θ as (temperature) = 20 ° C., (measurement frequency) = 10 Hz
being 0.43. Under the conditions, the single IIR of 60 ° is 0.32, and the case of 100% by weight
of polynorbornene rubber is 0.43.
[0030]
The results show that by adding 10 weight percent of polynorbornene rubber to IIR 60 °, the
polynorbornene rubber has the same internal loss characteristics as 100 weight percent.
[0031]
As another example of a base material of a speaker edge to which polynorbornene rubber is
added, one obtained by adding polynorbornene rubber to EPDM and SBR and foaming is
mentioned, and the composition thereof is as follows.
Polynorbornene rubber 60.0 wt% EPDM 10.0 wt% SBR 10.0 wt% carbon 7.0 wt% resin 6.0 wt%
zinc oxide 1.5 wt% stearic acid 1.0 wt% aramid fiber 0 wt% blowing agent 1.5 wt% vulcanizing
agent 1.0 wt% In this example, EPDM is for improving the light fastness of the speaker edge, and
SBR is for adjusting the viscosity of the base material of the speaker edge , Each mixed with
11-05-2019
6
polynorbornene rubber.
[0032]
Furthermore, the base material of the speaker edge is increased in rigidity by blending 2% of
aramid fibers.
[0033]
FIG. 4 shows the results of the tensile strength test for the foam of the base material for the edge
of the speaker according to the above-mentioned composition and each of the foamed
polynorbornene rubber, foamed SBR, foamed EPDM and IIR 70 ° (solid rubber). Is a graph
showing
[0034]
As can be seen from this FIG. 4, the foam of the base material for the speaker edge having the
above-mentioned composition has almost the same tensile strength as the single foamed
polynorbornene rubber, and further has a tensile strength higher than that of other foamed SBR
and foamed EPDM. Is large, and it can be seen that it has a tensile strength comparable to IIR.
[0035]
FIG. 5 shows the result of comparison of the acoustic properties of the speaker edge molded by
the base material of the above-mentioned composition with the rubber edge made of foamed
polynorbornene rubber, foamed SBR, foamed EPDM and IIR 70 ° respectively.
[0036]
From this FIG. 5, the speaker edge molded by the base material of the above composition has a
smaller specific gravity than the speaker foam rubber edge made of foamed polynorbornene
rubber alone, and the Young's modulus is dramatically improved. It can be seen that the internal
loss is large in both the 100 Hz and 1 kHz frequency bands.
[0037]
In addition, with respect to the foamed rubber edge made of foamed SBR and foamed EPDM, the
specific gravity is slightly increased, but the Young's modulus is dramatically improved, and the
internal loss is increased in any frequency band of 100 Hz and 1 kHz. Further, it can be seen that
the rubber edge made of IIR 70 ° is inferior in Young's modulus, but small in specific gravity,
and has characteristics comparable to internal loss as well.
11-05-2019
7
[0038]
In the above example, as the fibers to be mixed with the base material of the speaker edge, in
addition to aramid fibers, liquid crystal polymer fibers, acrylic fibers, metal fibers, ceramic fibers,
silicon carbide fibers, silicon fibers, boron fibers, amorphous fibers, fluorine Fibers, acetate fibers,
silk staple fibers, etc. are used.
[0039]
The speaker edge is formed by pressing the rubber compound of the base material as described
above while heating and foaming between the fixed mold and the movable mold. At this time, the
rubber compound is fixed. When flowing radially inward and outward along the mold surface of
the side mold and the movable mold, as shown in FIG. 6, the short fibers f mixed in the rubber
compound are of the edge Ge It is oriented along the radial direction.
[0040]
Thus, by orienting the short fibers mixed in the base material along the radial direction inside the
edge, a highly rigid foam rubber edge is obtained, whereby abnormal movement of the
diaphragm is suppressed, A more reliable speaker can be produced.
[0041]
Brief description of the drawings
[0042]
1 is a diagram showing a reaction formula of the synthesis of norbornene.
[0043]
2 is a diagram showing a reaction formula of the synthesis of polynorbornene rubber.
[0044]
3 is a graph showing the temperature dependence of the loss coefficient of the polynorbornene
rubber.
[0045]
11-05-2019
8
4 is a graph showing the tensile strength of the rubber mixture in an example of the embodiment
of the present invention in comparison with other rubber materials.
[0046]
5 is a chart showing the acoustic properties of the speaker edge molded by the rubber mixture in
the same example.
[0047]
6 is a perspective view showing a speaker edge formed of a rubber mixture in the same example.
[0048]
Explanation of sign
[0049]
Ge ... edge f ... short fiber
11-05-2019
9
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
jp2002345080
1/--страниц
Пожаловаться на содержимое документа