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JPH0646491

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DESCRIPTION JPH0646491
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for electroacoustic transducers such as a paper diaphragm and a synthetic resin film
diaphragm. 2. Description of the Related Art Conventionally, diaphragms used for electroacoustic
transducers are made by molding plastic films, metal plates, woven fabrics, etc., or resin
processing is applied to natural fibers, synthetic fibers, etc. A large number of molded products
are used. However, since these have small specific elastic moduli, it was not possible to obtain
good frequency characteristics.
[0002]
In order to improve these, there is a diaphragm made of titanium or aluminum as a base material
and having diamond or the like formed on the surface of the base material. However, since these
have small internal losses, their use becomes complicated as a diaphragm having a large
amplitude.
[0003]
On the other hand, a method of using a microbial cellulose as a diaphragm having a large specific
elastic modulus and a large internal loss, and obtaining a lightweight, high-elastic, high internal
loss diaphragm has been proposed and put to practical use (Japanese Patent Application LaidOpen No. 61- 281800).
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[0004]
However, in the prior art, since the substrate is heated to about 100 to 900 ° C. and surfacecoated by the plasma CVD method, the thickness of the coating film is about 2 μm at the
maximum. There is a problem that the diaphragm can not be sufficiently used as a diaphragm
and the internal loss is small, so that the use thereof is limited as the diaphragm for acoustics, the
process becomes complicated, and the cost increases.
[0005]
Also, in the above-mentioned JP-A-61-281800, the effect of moisture is smaller than that of
general wood pulp, which is about half that of microbial cellulose, but the problem of being
affected by moisture is the presence of OH groups in the molecule. was there.
The present invention has been proposed in view of the above, and the object of the present
invention is to apply a coating agent to a diaphragm substrate to make a diaphragm having
weather resistance, high elasticity and high internal loss inexpensive. It is to propose.
[0006]
In order to achieve the above object, the present invention provides (1) fibrous materials such as
natural fibers, synthetic resin foams or plastic films, metal foams or metal plates, ceramic foams
or A vibrating plate substrate made of a ceramic plate or the like is surface-coated or
impregnated with a coating agent containing microbial cellulose as a compensating material, and
is dried by heating.
(2) The coating agent is characterized in that a natural polymer substance is used as a filmforming material, and at least a part of microbial cellulose is used as a film-compensating
material. (3) The coating agent is characterized in that a synthetic polymer substance is used as a
film-forming material, and at least a part of the cellulose is used as a film-compensating material.
(4) The coating agent is characterized in that an inorganic substance is used as a film forming
material, and microbial cellulose is used as an internal loss giving agent at least in part.
[0007]
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In the present invention, as described above, a film-forming material to which microbial cellulose
with high elasticity and large internal loss is added is surface-coated or impregnated on a
diaphragm substrate made of woven fabric, paper or the like. Thus, when the coating agent is
applied to a substrate having a small elastic modulus and a large internal loss, it is possible to
obtain a diaphragm having high elasticity, appropriate internal loss, and good weather resistance.
In addition, when the above-mentioned coating agent is applied to a substrate having a
diaphragm substrate made of metal, ceramics, etc. and thus having a large elastic modulus and a
small internal loss, it has a high elasticity and an appropriate internal loss, and A diaphragm with
good weather resistance is obtained.
[0008]
EXAMPLES Examples of the present invention will be described below. The microbial cellulose
used for this invention used what was produced as follows. The medium composition was 50 g of
sucrose, 5 g of yeast extract (Difco), 5 g of ammonium sulfate ((NH4) 2 SO4), 3 g of potassium
hydrogen phosphate (KH2 PO4), 0.5 g of magnesium sulfate (MgSO4 · 7 H2 O), distilled It is one
liter of water, pH 5.0. This culture medium is used for stationary culture, and the gel-like
membrane produced is purified by combining running water washing and boiling washing with
2% sodium hydroxide solution, and the cells and adsorption contained in the gel-like membrane
are adsorbed. Various media components were removed and produced.
[0009]
The gel-like film is dried, processed to an appropriate size, and added to a film-forming material,
or the gel-like film is added to a water-soluble film-forming material, and microbial cellulose is
dispersed by a mixer etc. Was produced.
[0010]
The coating agent of the organic solvent type uses Shellac "GSA" (Gifu Shellac Mfg. Co., Ltd.) as a
film forming material, and first, a solution of solid content of 12.5% is prepared with methanol,
and powder of microbial cellulose is added to this solution. It was prepared by adding the same
amount as shellac.
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In order to measure the rising effect of Young's modulus (hardness) when microbial cellulose is
added to the coating agent, the coating agent containing shellac alone and the coating agent to
which microbial cellulose is added is flow-coated on a glass plate and the hardness is changed by
the sludge locker. Were measured and compared. The results are shown in Table 1. As apparent
from Table 1, the hardness increased significantly.
[0011]
A water-soluble coating agent with microbial cellulose was prepared as follows. As the filmforming material, a carboxylated SBR-based latex “FE-211” (manufactured by Dainippon Ink
and Chemicals, Inc.) is used. did. The frequency characteristic of the speaker (diameter 10 cm)
when the coating agent of the organic solvent type prepared as described above is applied to a
paper cone is shown in FIG. As is clear from FIG. 1, in the case where the microbial cellulose was
added, the high region expanded, the distortion was small, and the sound quality was good.
[0012]
The frequency characteristic of the speaker (aperture 10 cm) when the water-based coating
agent prepared as described above is applied to an aluminum diaphragm is shown in FIG. As is
clear from FIG. 2, in the case where the microbial cellulose is added, the high region is expanded
because the Young's modulus is larger than that of the non-added product. On the other hand,
the propagation speed of the diaphragm coated with the coating agent to which microbial
cellulose is added is faster than about 3,500 m / s and the internal loss is as large as 0.06 as
compared with the aluminum single plate, so the regeneration of the high region is The decrease
in frequency is small and the characteristic peak and dip are small. When the above-mentioned
coating agent with microbial cellulose was applied to a substrate of high elasticity and low
internal loss such as ceramics, an effect similar to that of aluminum was obtained.
[0013]
According to the present invention, as described above, a diaphragm made of a fibrous substance
such as natural fiber, a synthetic resin foam or plastic film, a metal foam or metal plate, a ceramic
foam or ceramic plate, etc. The substrate is surface-coated or impregnated with a coating agent
containing microbial cellulose as a composite material, heat-dried and processed into a
predetermined shape, and then by forming a diaphragm, it has weather resistance, high elasticity
and high strength. A diaphragm having an internal loss can be obtained inexpensively.
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