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JPH04364699

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DESCRIPTION JPH04364699
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
structure of a diaphragm used for a speaker finished by mixing glutinous rice powder in paper
fibers and a method of manufacturing the same.
[0002]
2. Description of the Related Art Conventionally, a speaker diaphragm of this type is finished by
forming a beaten paper pulp fiber into a cone shape, heating, drying, pressing and forming. The
internal structure is a viscous fiber liquid (see FIG. 3) which is exuded to the surface of the fiber
(2a) at the junction of the entangled fibers of the pulp fiber (2a) of the paper. 2b) completes the
bonding of the fibers (2a) to one another. And air is contained in a bubble-containing state in
those gaps. Therefore, when it consists only of the air inside, the strength as paper is not so
strong, it is soft, and it does not hold moisture resistance sufficiently. In order to reinforce it,
paper pulp fibers and fillers, fibers, different celluloses, etc. were mixed, and paper pulp fibers
were impregnated with resin.
[0003]
Accordingly, in the conventional speaker diaphragm of this type, the airtightness is not sufficient
either, and the weight of the impregnated resin makes it heavy, which causes the radiation
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efficiency of the speaker to be increased. Was a problem that In addition, there is also a problem
that the speaker distortion sound due to the abnormal vibration of the diaphragm can not be
managed to some extent or more.
[0004]
[0004] Therefore, in order to solve the problems of such a conventional speaker, the present
invention mixes glutinous rice powder (3a) with paper fiber (2a) pulp and heats it. It is an object
of the present invention to provide a diaphragm for a speaker capable of remarkably improving
the moisture resistance performance for the purpose of improving the acoustic radiation
efficiency of the speaker and the reproduction sound quality by setting the diaphragm of the
same hardness to the conventional one. It is intended to be provided.
[0005]
SUMMARY OF THE INVENTION The present invention for achieving the object will be described
with reference to FIGS. 1 and 2 corresponding to the embodiments. Powdered glutinous rice
powder (3a) is dispersed and mixed, formed into a sheet, heated, dried and formed into a speaker
diaphragm (1), paper pulp fibers (2a) and glutinous rice powder (3a) mixed This is a speaker
diaphragm (1) and a method of manufacturing the same, which is characterized in that it is
formed into a paper, dried by heating, molded and finished.
[0006]
Since the present invention is configured as such, the gelatinized starch (3b) contained in the
glutinous rice (3a) is uniformly dispersed among the paper fibers (2a). The shell is broken by
heating, the contents pop out, and in the high temperature atmosphere, the middle space
between the entanglement of the paper fiber (2a) is adhered and filled with the viscous substance
(2b).
Therefore, in the speaker diaphragm (1) of the present invention, the space of the paper fiber
(2a) can be filled with the glue (3b), the airtightness can be increased, and the elastic modulus
can be remarkably increased as the diaphragm (1).
As a result, the diaphragm (1) of the present invention is not only favorable for the improvement
of the acoustic radiation efficiency, but also reduces the distortion of the reproduction sound
quality, whereby the characteristics can be improved.
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2
[0007]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an enlarged cross-sectional view of a first embodiment of the present invention.
That is, it is a speaker diaphragm (1) formed by dispersing and mixing glutinous rice powder (3a)
(following (3b)) in paper pulp fibers (2a), forming into a sheet, and drying by heating.
[0008]
Also, the present invention is characterized in that paper pulp fibers (2a) and glutinous rice
powder (3a) are mixed and formed into a sheet, which is then dried by heating, shaped and
finished, the speaker diaphragm (1) being manufactured. It is a method.
[0009]
Although the embodiments considered to be representative of the present invention have been
described above, the present invention is not necessarily limited to only the structure of these
embodiments, and has the above-described components according to the present invention, and
In order to achieve the object of the present invention, the present invention can be
appropriately modified and implemented within the scope having the effects described below.
[0010]
As apparent from the above description, the present invention has such a structure, and as
shown in FIG. 2, it is contained in glutinous rice (2a) in the paper making process as shown in
FIG. The gelatinized starch (2b) to be dispersed is uniformly dispersed among the paper fibers
(2a), and further heated at high temperature to break the shell and the contents pop out, paper
fibers (2a) in a high temperature atmosphere. The middle gap of the entanglement is filled with
the viscous substance (3b) and adhered.
Accordingly, in the speaker diaphragm (1) of the present invention, the space formed by the
paper fibers (2a) is filled with the glue (3b), so that the airtightness becomes high and the elastic
modulus can be remarkably increased as the diaphragm.
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As a result, the diaphragm (1) of the present invention is not only favorable for the improvement
of the acoustic radiation efficiency, but also reduces the distortion of the reproduction sound
quality, whereby the characteristics can be improved.
[0011]
In the method of the present invention, paper pulp fibers (2a) and glutinous rice powder (3a) are
mixed and formed into a sheet, and the mixture is dried by heating and shaped to finish, so that
starchy starch (3b) is formed. Since the space of the paper pulp fiber (2a) can be filled, the
hardness of the diaphragm (1) can be maintained, and the process of impregnating the
conventional resin becomes unnecessary, and the manufacturing cost of the speaker diaphragm
(1) is increased. It came to have a remarkable effect that can not be expected from the
conventional one to be reduced.
[0012]
A real comparison of the physical properties of the conventional product and the product of the
present invention is shown in Table 1.
In addition, a comparison of frequency characteristics is shown in FIG. 4 for the conventional
product (dotted line) and the product of the present invention (solid line) when the diaphragm is
incorporated in a speaker.
[0013]
Brief description of the drawings
[0014]
1 is an enlarged cross-sectional view showing the completed configuration of the first
embodiment of the present invention.
[0015]
2 is an enlarged sectional view of an intermediate step of the first embodiment of the present
invention.
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4
[0016]
3 is an enlarged sectional view of a conventional example.
[0017]
4 is a frequency characteristic diagram showing a comparison of the conventional product and
the product of the present invention.
[0018]
Explanation of sign
[0019]
(3b) Glutinous substance of gelatinized starch of glutinous rice Table 1
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