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JPS63215199

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DESCRIPTION JPS63215199
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of a speaker diaphragm, and more particularly to the improvement of a speaker
diaphragm formed by laminating polypropylene resin sheets centering on a carbon fiber cloth
and press-molding. [Prior Art] Conventionally, there have been attempts to use the high rigidity
of carbon fiber as a material of a speaker diaphragm and to put it to practical use. For example, a
moving plate as shown in FIG. 2 is formed by impregnating a carbon fiber cloth (woven fabric)
with an epoxy resin to form a prepreg sheet, and heating and pressing the prepreg sheet on a
moving plate having a predetermined shape. As shown in the figure, the imaging moving plate is
integrated by laminating a plurality of polypropylene resin sheets b1, b2,... It has been tried.
[Bringing problem, the problem to be solved by the way] By the way, the diaphragm shown in
FIG. 2 has a large internal loss by using a polypropylene resin as compared with the diaphragm
formed by molding the above-mentioned prepreg sheet. Although it has the effect of suppressing
resonance and suppressing the occurrence of peaks and dips in frequency characteristics,
polypropylene resin has a higher resin viscosity at the time of heat melting than epoxy resin
(epoxy resin: several tens of cps, polypropylene resin: Because it is shaped into a moving plate
shape for several thousand cps, and the polypropylene resin is sufficiently impregnated inside
the cloth, the press pressure is high (the above-mentioned prepreg sheet molding pressure:
approximately 10 K (] / cm, polypropylene resin sheet Lamination pressure: about 100 kg / crti>
must be. However, since the polypropylene resin is unnecessarily impregnated inside the cloth by
high-pressure molding and flows to the outer peripheral portion of the diaphragm, voids and the
like are easily generated, and the appearance is impaired. Furthermore, although the surface of
the press die is subjected to embossing for air treatment, the polypropylene resin enters into the
irregularities of the embossing and adheres along with the cooling step after molding, so that it
becomes difficult to separate, There is a problem that it is difficult to obtain a diaphragm having
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a constant surface shape. [Means for Solving the Problems] The present invention is directed to
at least a radiation surface of a speaker imaging plate formed by arranging a plurality of layers of
polypropylene resin sheets on both sides of a carbon fiber cloth and heating pressing the sheets.
The polypropylene resin sheet of the first layer disposed on the front of the diaphragm is a
diaphragm for a speaker using a polypropylene resin having a melt flow rate smaller than that of
the polypropylene resin sheets of the other layers.
[Operation] By arranging a polypropylene resin sheet having a small melt flow rate value on the
surface, the flow of the polypropylene resin can be suppressed and the mold release can be
facilitated. [Example] (Example 1) In FIG. 1a, A is a carbon fiber cloth, B + N B2... Bn is a
polypropylene resin sheet disposed on both sides of the carbon fiber cloth is there. Also, the
sheet B1 of the first layer is (t! A sheet formed of a polypropylene resin having a smaller melt
flow rate value than the two-layer sheet B2, ..., Bn is used. The laminate is formed into a
diaphragm of a predetermined shape by heat press molding. Example 1 is a carbon fiber cloth,
and 6151B is used as a carbon fiber cloth, Chisso vAK-1011 (melt flow rate: 0.7) is used as a
polypropylene resin sheet B1 of the first layer, and polypropylene resin sheets B2 of other layers
are used. ··········································································································································· As Bn, using
−1800 (melt flow rate: 20) manufactured by the company, and laminating 10 sheets of
polypropylene resin sheets on both sides of carbon fiber cloth, pressing pressure 100 kg / cm.
Then, a diaphragm was obtained by press molding at a mold temperature of 100 ° C. Example 2
As shown in FIG. 1b, carbon fiber mat used in Example 1 is laminated with a carbon fiber mat
(easted, toreca mat: BO-030) on the opposite side of the C @ radiation surface, the first layer As a
polypropylene resin sheet B1 of Chisso ■ -1011 (melt flow rate: 0.7>, polypropylene resin sheet
B2 of the other layer, ....., Bn, made by the company -1800 (melt Using a flow rate of 20), and
laminating 10 sheets of polypropylene resin sheet on both sides of carbon fiber cloth and carbon
fiber mat, and press forming at a press pressure of 80 K (] / cm, mold temperature of 100 ° C
The diaphragm was one. [Effects of the Invention] As a comparative example of Example 1, the
above-mentioned carbon fiber cloth is used as a polypropylene resin layer B1. A diaphragm was
obtained by using a polypropylene resin sheet laminated on each side of a carbon fiber cloth by
10 sheets and pressing it at a pressure of 100 kg / ci and a mold temperature of 100'C. Example
1 and Comparative Example 1 Table 1 shows the results of measuring the number of voids and
the gloss factor (according to JIS Z-8741) of the diaphragm. As a comparative example of Table 1
Example 2, a carbon fiber mat (East, Toreca mat: 8O-030) is laminated on the carbon fiber cloth
used in Example 2 on the opposite side of the radiation surface, and polypropylene resin layer B1
···
·······································································································································································································
··································································· 10 It is press-molded at 1 / cn and a mold temperature of 100
° C.
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Example 2 and Comparative Example 2 Table 2 shows the results of measuring the number of
voids and the gloss factor (according to JIS Z-8741) of the diaphragm. According to the present
invention, the number of voids was significantly reduced by each person according to the abovementioned table, and the surface shape of the diaphragm was smoothened by the increase of the
gloss factor, so that the effect could be obtained. Also, it was found that the carbon fiber mat in
Example 2 had the effect of suppressing void formation and further had the effect of reducing
the orientation of the carbon fiber cloth. In addition, the press material of each Example may be
previously shape ¦ molded to the sheet ¦ seat integrated and integrated.
[0002]
Brief description of the drawings
[0003]
Fig. 1a is a cross-sectional view of a pressed material of a speaker diaphragm according to an
embodiment of the present invention], Fig. 1b is a cross-sectional view of a pressed material of a
speaker diaphragm according to an embodiment 2 of the present invention, and Fig. 2 is a
conventional speaker It is sectional drawing of the press material of a diaphragm.
A: Carbon fiber cloth
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