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JPH0738991

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DESCRIPTION JPH0738991
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker edge used for various audio equipment and a method of manufacturing the same.
[0002]
2. Description of the Related Art Conventionally, the speaker edge of a paper-made product used
for radio and the like has been made of paper pulp and a few percent synthetic resin. That is,
after producing a sheet of a continuous papermaking body of paper pulp by a papermaking
method such as a round net, impregnating this sheet with an acrylic resin or the like and drying
it, it is cut into a predetermined shape and hot press molded .
[0003]
However, since the speaker edge having the above-mentioned conventional configuration lacks
air tightness, the speaker incorporating this speaker edge has a problem that harmonic distortion
in the bass region is increased. In addition, since the material itself is not flexible, the lowest
resonance frequency (f0) of the speaker is increased, and there is a problem that the bass range
can not be reproduced. Furthermore, there is also a problem that the strength of the material is
low and the speaker can not withstand the input of large amplitude without being broken.
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1
[0004]
An object of the present invention is to solve the above-mentioned conventional problems and to
provide a speaker edge capable of exhibiting excellent performance and a method of
manufacturing the same.
[0005]
[Means for Solving the Problems] In order to solve the above-mentioned problems, the present
invention is to constitute an edge for a speaker by a material formed by combining a mixture of
thermoplastic polyurethane elastomer fiber and paper pulp with a polyurethane synthetic resin.
is there.
[0006]
In addition, in order to closely adhere all three members of thermoplastic polyurethane elastomer
fiber, paper pulp and polyurethane synthetic resin, a polyurethane synthetic resin emulsion is
added in a state where a mixture of thermoplastic polyurethane elastomer fiber and paper pulp is
dispersed in water. Then, it is fixed on a paper pulp surface with aluminum sulfate, formed into a
sheet, and thermally pressed to melt the polyurethane elastomer and the polyurethane resin so
as to be integrated with the paper pulp.
[0007]
By virtue of this construction, the polyurethane elastomer having a thermoplastic property and
the polyurethane synthetic resin binder have self-adhesiveness, and only a small amount of the
polyurethane synthetic resin adheres to the surface of the paper pulp, and they are fusionbonded to each other at the time of heat pressing The strength of the material can be given to
[0008]
In addition, when the thermoplastic polyurethane elastomer flows at the time of heat press
molding, the gap between the paper and pulp can be effectively filled, and the entire material
constituting the speaker edge can maintain airtightness.
In addition, since the polyurethane elastomer itself is a flexible material, the minimum resonance
frequency (f0) of the speaker does not increase.
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2
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A speaker edge according to an
embodiment of the present invention will be described below with reference to the drawings.
[0010]
FIG. 1 is a perspective view showing a part of a speaker edge according to the present invention
with a part cut away, and FIG. 2 is an enlarged sectional view of the relevant part.
In FIG. 1 and FIG. 2, 2 is a speaker edge, and the speaker edge 2 is a polyurethane elastomer
fiber of 60 wt% of paper pulp 3 of 700 cc of Canadian freeness of NUKP (Needle-UnbiechedKlaft-Pulp) and an average fiber length of 5 mm. After stirring and mixing 40 wt% of 5 in water,
5% of a cationic polyurethane synthetic resin emulsion is added and thoroughly mixed for 30
minutes.
Next, aluminum sulfate powder (Sumitomo Chemical Co., Ltd. trade name: sulfuric acid band) is
dissolved in hot water beforehand, and added until the pH of the paper pulp mixed solution
becomes 4.5.
In this state, the polyurethane synthetic resin 4 is fixed to the surfaces of the paper pulp 3 and
the polyurethane elastomer fiber 5.
This paper pulp mixed solution was used to make a paper with a 10 cm diameter (100 mm outer
diameter, 62 mm inner diameter) paper edge mold and was press molded with 3 kg / cm 2 at
180 ° C. for 25 seconds using a press die. At this time, it was 0.5 g when the weight of this edge
part was measured.
[0011]
As a comparative example, a paper pulp of NUKP under the same conditions is continuously
made with a sheet width of 500 mm in a round mesh paper making facility, then impregnated in
a 20% toluene solution of acrylic resin for 5 seconds and dried at 120 ° C for 30 minutes
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Obtained. This was molded under the same conditions in the same mold-like press mold to obtain
a speaker edge 2a having an edge portion weight of 0.48 g in FIGS.
[0012]
When the diaphragms 1, 1a with an inner diameter of φ25, an outer diameter of φ68, and a
weight of 0.8 g are attached to these two speaker edges 2, 2a and the respective f0 is measured,
the speaker edge 2 of the embodiment is The frequency was 100 Hz, and the comparative
example was 120 Hz.
[0013]
Next, in order to check the air permeability, 10 cm of water was put on the back of the speaker
edge 2, 2a with a device as shown in FIG. 5 to test the permeability, and the example kept the
water for 24 hours. In Comparative Example, water permeated in 30 minutes.
[0014]
Furthermore, when the edge material was cut into a width of 10 mm and the tensile strength was
measured, it was 960 g / cm for the comparative example with respect to 1500 g / cm for the
example.
[0015]
As described above, since the speaker edge according to the present invention is configured,
airtightness performance is effectively achieved without increasing the weight of the speaker
edge and without increasing the manufacturing process of the speaker edge. In addition, the
strength can be increased at the same time, and by lowering the lowest resonance frequency of
the speaker, reproduction can be performed to a wide frequency band, which is of great
industrial value.
[0016]
Brief description of the drawings
[0017]
1 is a cutaway perspective view showing the configuration of the speaker edge in an embodiment
of the present invention
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[0018]
Fig. 2 The same main part enlarged sectional view
[0019]
Fig. 3 A cutaway perspective view showing the configuration of the conventional speaker edge
[0020]
Fig. 4 The same main part enlarged sectional view
[0021]
Fig. 5 Front sectional view showing a waterproof test of the edge for the speaker
[0022]
Explanation of sign
[0023]
1 diaphragm 2 edge 3 paper pulp 4 polyurethane synthetic resin 5 polyurethane elastomer fiber
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