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The object is to provide a speaker edge which has sufficient strength and rigidity, and which can
be light and thin. The speaker edge is made of rubber compounded with a deformed filler and /
or a minute filler. As the filler, nylon staple fibers, carbon fibers, layered or scaly inorganic fillers,
etc. are suitable. As carbon fibers, carbon nanotubes and vapor grown carbon fibers are
preferable. As a layered or scale-like inorganic filler, mica is suitable.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker edge, and more particularly to a speaker edge suitable for use in vehicles. 2. Description
of the Related Art In a speaker, a component such as an edge for supporting a diaphragm is used
as a vibration system component. For this speaker edge, since this edge directly affects the
operation of the diaphragm, it absorbs the extra vibration of the diaphragm and is excellent in
linearity, and has a high internal loss. It is required to have the necessary strength and to be
lightweight. Conventionally, in order to reduce the weight of the vibration system of the speaker,
such a speaker edge is mainly made of foamed rubber of SBR (styrene-butadiene-rubber) type or
EPDM (ethylene-propylene-ethylene norbornene) type. Materials are used. Patent Document 1:
JP-A-2002-159093, Paragraphs [0011], [0011], [0012] [Problems to be Solved by the Invention]
However, it has been formed by such a foamed rubber material Foamed rubber edges have lower
strength and stiffness than edges molded of solid rubber. An object of the present invention is to
provide a speaker edge excellent in strength and rigidity. The speaker edge according to the
present invention is characterized in that the speaker edge made of rubber contains an
irregularly-shaped filler and / or a minute filler. Such a speaker edge has high strength and
rigidity due to the inclusion of the irregularly-shaped filler and / or the minute filler in the
rubber. Moreover, weight reduction is possible. DETAILED DESCRIPTION OF THE INVENTION In
the present invention, various rubber components can be used without particular limitation as
the rubber component constituting the speaker edge. For example, EPDM, SBR, NBR, CR, IR, and
the like can be used. IIR, SR etc. are mentioned. Preferred rubber components are EPDM and SBR.
In addition, syndiotactic 1,2-polybutadiene may be blended with this rubber component in an
amount of 5 to 40 parts by weight with respect to 100 parts by weight of the rubber component.
The rubber component may be vulcanized under any suitable conditions using any suitable
amount (for example, 0.5 parts by weight based on 100 parts by weight of the rubber
component) of a vulcanizing agent (sulfur). If necessary, vulcanization accelerators (eg, MBT,
ZnBDC, DPTT) are used.
As the irregularly shaped filler and / or the fine filler, nylon short fibers, carbon fibers, layered or
scaly inorganic fillers and the like are suitable. As the nylon staple fibers, those having a diameter
of 0.05 to 1.0 μm and a length of about 5 to 15 μm are preferable. As carbon fibers, carbon
nanotubes and vapor grown carbon fibers are preferable. As the layered or scale-like inorganic
filler, mica is suitable, and this mica is preferably surface-treated to enhance the hydrophilicity to
rubber. The deformed filler and / or the fine filler may be blended one or more of the above. The
blending amount of the filler is preferably about 5 to 30 parts by weight (1.5 to 10 parts by
weight as 6 nylon) with respect to 100 parts by weight of the rubber component. Various
additives are added to the rubber component as required. Representative examples of the
additives include the above-mentioned vulcanization accelerators, reinforcing agents (for
example, carbon black, white carbon), releasing agents (for example, stearic acid), accelerating
activators (for example, zinc oxide), plastic Agents (eg, process oil) and the like. These additives
may be added in any appropriate amount depending on the purpose. In the present invention, the
speaker edge may be made of foam rubber or solid rubber. In the case of the speaker edge made
of foam rubber, the foaming ratio is preferably about 2 to 4 times. In order to produce a speaker
edge from a rubber composition containing a filler and optionally an additive, the rubber
composition is placed on the mold surface of a fixed mold and then moved by a movable mold. It
may be heat-pressed. In addition, what is necessary is to mix ¦ blend foaming agent (For example,
a freate, aluminum acetate, ammonium carbonate) and a foaming adjuvant with a rubber
compound, and just to foam-mold, when using rubber ¦ gum as foaming rubber. At this time,
after press molding with a mold, heating and foaming, the movable mold is opened to a
predetermined opening degree to sufficiently foam, and excess gas is released out of the mold,
and then gold The mold may be closed to a predetermined degree of opening, and foam rubber
may be pressed to form a speaker edge of a desired shape. The manufactured speaker edge can
have a loss characteristic of, for example, about 0.2 to 0.3 at a normal temperature of tan δ.
EXAMPLES Examples 1 and 2 and Comparative Examples 1 and 2 will be described below. A
rubber sheet for a speaker edge was produced from the rubber having the composition shown in
Table 1, and the characteristics were evaluated.
In Example 1, 10 PHR of LA 1060 manufactured by Daiwa Polymer Co., Ltd. was blended as a
short nylon fiber, and in Example 2, 22.5 PHR was blended. The comparative example 1 does not
mix ¦ blend the nylon short fiber in Example 1, 2, and the comparative example 2 increases FT
carbon and sulfur in the comparative example 1. FIG. The FT carbon used is thermal black
manufactured by Asahi Carbon Co., Ltd., and the SRF carbon is furnace black. As the rubber
sheet, one having a thickness of 0.5 mm and a thickness of 2 mm was manufactured. The
vulcanization temperature was 200 ° C., and the vulcanization time was 30 seconds in the case
of 0.5 mm thick and 60 seconds in the case of 2 mm thick. The density was calculated by the
substitution method. The hardness was measured in accordance with JIS K6253-1993 by
stacking three 2 mm-thick rubber sheets. As for the spreadability, the diameter of a molded
product when a 6 g sample was vulcanized and molded by a 500 μm mold was measured, and
this was used as a measure of flowability. The tensile properties were measured according to JIS
K 66251-1993 at a speed of 300 mm / min for dumbbell No. 6 with a thickness of 0.5 mm. The
measuring apparatus is Shimadzu Autograph SES-1000. The processability is a comprehensive
evaluation of the spreadability and the vulcanizability, and the conditions are gradually tightened
from the vulcanization condition of high temperature and long time, and the evaluation is
repeatedly performed until it becomes x. The results are shown in Table 1. As is apparent from
the above embodiments, according to the present invention, sufficient strength and sufficient
strength can be obtained. A speaker edge is provided which is rigid, yet lightweight and can be
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