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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various acoustic devices and a method of manufacturing the same.
2. Description of the Related Art Heretofore, as a waterproof type paper pulp diaphragm used for
a door mount speaker for vehicles etc., it has been constructed as shown in FIGS. 2 (a) and 2 (b).
That is, as shown in FIG. 2 (a), the speaker diaphragm 1 formed by paper making is dipped in a
solution of the synthetic resin 5 in a later step, and as shown in FIG. 2 (b) The synthetic resin 5
was made to adhere, and it was the structure which prevents permeation of water.
2 (a) and 2 (b), 2 indicates an edge attached to the outer peripheral portion of the speaker
diaphragm 1, and 3 indicates pulp.
However, in the above-described conventional configuration, when the synthetic resin 5 only for
preventing the entry of water is attached to the speaker diaphragm 1, the speaker diaphragm 1
becomes heavy, and the sound pressure of the speaker decreases. There was a problem of
Moreover, since the layer of the synthetic resin 5 which prevents the penetration of water is only
on the surface, there is a problem that the waterproofness is lost when the surface is damaged
due to an accident of handling or the like.
Furthermore, since it is necessary to dip the speaker diaphragm 1 made by paper making and
molding in a solution of the synthetic resin 5, there are also two manufacturing processes of the
speaker diaphragm 1 and the manufacturing cost is increased.
An object of the present invention is to solve the above-mentioned conventional problems, and to
provide a speaker diaphragm that can exhibit excellent waterproof performance and a method of
manufacturing the same.
[Means for Solving the Problems] In order to solve the above problems, the speaker diaphragm
according to the present invention forms a diaphragm by paper-forming paper pulp on which a
rubber latex mainly composed of natural rubber is fixed. It is a thing.
Also, in order to fix the latex on paper pulp, a fixed amount of the emulsified latex is put into a
suspension of paper pulp, and fixed on paper pulp with aluminum sulfate as a fixing agent.
[Function] With this configuration, a small amount of latex can form a film on the speaker
diaphragm when only a small amount is fixed to the paper pulp, and the waterproof performance
as the speaker diaphragm can be satisfied. The weight of the speaker diaphragm does not
increase because the effect is obtained.
In addition, since the paper pulp fibers themselves constituting the diaphragm for a speaker have
waterproof performance, waterproofness is not lost even by handling scratches and the like.
Further, since the latex is fixed collectively at the stage of the raw material pulp, the number of
manufacturing processes is not two, and the manufacturing cost of the speaker diaphragm does
not increase.
method of manufacturing the same according to an embodiment of the present invention will be
described below with reference to the drawings.
1 (a) and 1 (b) show the configuration of the speaker diaphragm according to the present
invention, FIG. 1 (a) is a perspective view of the main part, and FIG. 1 (b) is an enlarged partial
cross section Parts having the same configuration as the conventional example are given the
same reference numerals.
In the speaker diaphragm 1 of the present invention, soft wood-based unbleached kraft pulp is
beaten up to 680 cc of Canadian freeness, a predetermined dye, paper strength agent and sizing
agent are added, and water soluble latex is added to paper pulp raw material 3 After adding and
stirring for ~ 5WT%, add aluminum sulfate (Sumitomo Chemical made sulfuric acid pendant)
while stirring until pH of pulp solution becomes 4.5 to 5.0, and obtain pulp solution for speakers
The speaker diaphragm 1 obtained as described above is obtained by paper-making with a
papermaking net in the shape of the diaphragm 1, and the speaker diaphragm 1 thus obtained is
shown in FIG. The latex 4 is fixed on the surface.
It was 3% when the weight increase rate of the diaphragm for speakers by the presence or
absence of a waterproofing agent was measured about the diaphragm 1 for speakers of this
invention obtained in this way.
This is much smaller than the weight increase rate of 12% of the conventional method by dipping
of the synthetic resin 5, and it can be seen that the weight increase of the speaker diaphragm 1 is
suppressed as much as possible.
Further, when a waterproof test was conducted in which water was stored at a minimum water
depth of 30 mm and left for 96 hours on the back surface of the speaker diaphragm of the
present invention, no water leakage occurred.
Further, a part of the speaker diaphragm was cut between the layers to a thickness of about half
and the same waterproof test was performed, but no water leakage occurred.
As described above, since the speaker diaphragm according to the present invention is
configured, the waterproof performance can be effectively improved without increasing the
weight of the speaker diaphragm and without increasing the number of manufacturing
processes. It can be obtained and has great industrial value.
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