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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
improvement of a speaker vibration supporting member such as a speaker damper or an edge.
[Prior Art] A diaphragm supporting member such as a damper or an edge of a conventional
speaker is made by impregnating a woven fabric with a phenolic resin and heat-forming it into a
predetermined shape, and applying a rubber latex such as styrene-butadiene rubber (SBR) The
thing which was done was used a lot. [Problems to be Solved by the Invention] The conventional
support member of this type can not suppress the high frequency resonance of the speaker
because the internal loss (tan δ) is not sufficient, and the peak dip due to the edge coincidence
in the mid frequency range Was prone to problems. Furthermore, the weather resistance of the
rubber latex to be applied is not sufficient, and it is a problem when applied to an in-vehicle
speaker used under direct sunlight, high temperature, high humidity environment. [Means for
Solving the Problems] The present invention is a support member obtained by forming a base
coated with brominated putyl rubber radex obtained by copolymerizing isoprene with
isobutylene and brominated butyl rubber into a predetermined shape. The present invention will
now be described by way of examples, in which 68 pieces / piece × 68 pieces / piece, 1108.3 g
/ 'rIt, 0.28 mm thick cotton woven fabric having a phenolic resin concentration of 20% are used.
After impregnating with a methanol solution and drying, after coating a brominated butyl rubber
latex at a coating amount of 50 g / rd, it is punched into a predetermined shape and press
molded (mold temperature 190′C, press pressure 5 K9 / r: i) L /, an edge of the shape shown in
FIG. 1 was obtained. [Effects of the Invention] On the other hand, as a comparative example, the
same twill weave 5 was impregnated with the same amount of phenol resin and coated with the
same amount of SBR latex was molded into a damper of the same shape, and the internal loss of
both was measured. As a result, the comparative example was tan δ-0 ° 11, whereas it was tan
δ-0, 18 in the example of the present invention. The frequency characteristics of the speaker
using both edges are as shown in FIG. 2, and the speaker using the edge of the embodiment of
the present invention has a small high frequency resonance and suppresses the dip in the mid
region due to the edge resonance. We were able to. Furthermore, when the decrease rate of the
tensile strength after the light deterioration test (black panel temperature 80 ° C., temperature
95% R 11,500 hours) was measured for both of them, the comparative example also decreased
by 63%. In contrast, in the example of the present invention, the rate was only 96%. That is,
according to the present invention, it is possible to provide an excellent supporting member with
very little light degradation and a good internal loss, and to have excellent effects such as
enabling application to an on-vehicle speaker.
Brief description of the drawings
FIG. 1 is a cross-sectional view of the edge of the embodiment of the present invention, and FIG.
2 is a frequency characteristic diagram of each of the speaker of the embodiment of the present
invention and the conventional edge.
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