JP2000059883

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DESCRIPTION JP2000059883
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker suitable for use in a speaker.
[0002]
2. Description of the Related Art Conventionally, as a diaphragm of a speaker, those formed of
paper pulp and plastic have mainly been used. Under such circumstances, a wooden diaphragm
is desired as a diaphragm capable of reproducing a sound closer to a more natural sound.
[0003]
As a method of manufacturing the wooden diaphragm, for example, a method as shown in FIG. 2
and FIG. 3 is considered. In the manufacturing method shown in FIG. 2, an arc-shaped notch 1a is
previously formed in the center of a single wooden sheet 1, and a fan-shaped notch 1b is formed
continuously therefrom, and the sector In this method, both edge portions 1b-1 and b-2 of the
notched portion 1b are bonded to each other, and then the rubber-like diaphragm 1 is formed by
press heating and forming.
[0004]
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Further, the manufacturing method shown in FIG. 3 is a method in which a plurality of small
pieces of wood pieces 2-1,..., 2-7 are attached to each other and then the trumpet shaped
diaphragm 2 is press-formed.
[0005]
However, in the manufacturing method as described above, since the sheet is formed of wood
only, there is a problem that wrinkles and cracks occur during press heating and forming.
In addition, uniform heat molding can not be obtained, or environmental changes after heat
molding can not be tolerated, and temporal changes such as deformation and cracking have
occurred.
[0006]
Therefore, the present invention is intended to provide a diaphragm for a speaker which solves
the above-mentioned problems.
[0007]
Therefore, in order to solve the above-mentioned problems, in the present invention, at least one
of thin non-woven fabric, Japanese paper and carbon sheet is pasted on one side of a wooden
sheet. A laminated sheet is prepared, and the laminated sheet is impregnated with a
thermosetting resin, and then formed into a substantially trumpet shape by press heating and
forming.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described by way of preferred embodiments with reference to the drawings.
FIG. 1 is a manufacturing process diagram of the speaker diaphragm according to the present
embodiment.
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In the figure, first, as a first step, a non-woven material or Japanese paper 10b made of a known
material or a carbon material is attached to one side of a wooden sheet (sticking board) 10a of
about 0.25 mm to 0.30 mm thickness with an adhesive. A bonded sheet 10 is created [FIG. 1 (a)].
[0009]
Next, as a second step, the laminated sheet 10 is impregnated into a container A containing a
thermosetting resin [FIG. 1 (b)]. The purpose of this impregnation is to prevent the occurrence of
wrinkles and cracks during press heating and forming so that uniform heating and forming can
be obtained, and to prevent time-dependent changes such as deformation and cracks after heat
forming. It is.
[0010]
Thus, the bonded sheet 10 impregnated with the thermosetting resin is formed into a known
substantially trumpet shape by press heat treatment by the press device P having a known
configuration in the next third step. Figure 1 (c), (d)].
[0011]
Thereafter, the laminated sheet 10 molded into a trumpet shape is punched out at its central
portion to form a hole 10-1 corresponding to a voice coil (not shown), and the outer diameter is
removed to obtain a predetermined value. And the dimensions of the diaphragm [Fig. 1 (d), (e)].
The front and back surfaces of the diaphragm 10 are coated with a thermosetting resin.
[0012]
As described above, according to the speaker diaphragm of the present embodiment, the
occurrence of wrinkles and cracks during press heating molding can be prevented, and a uniform
heating molded product can be obtained, and further, after heating molding It is possible to
prevent time-dependent changes such as deformation and cracking. Therefore, the speaker
diaphragm can be mass-produced, and when the speaker diaphragm is adopted as a speaker, the
sound quality due to natural vibration of wood can be reproduced without any change with time.
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[0013]
Next, another embodiment will be described with reference to FIG. In this embodiment, a
substantially V-shaped cut 21 and a small hole 22 in the vicinity of the vertex of the substantially
V-shaped cut 21 are provided in the bonded sheet 20 before the first molding. The incisions 21
are provided substantially along the grain direction 23 of the bonded sheet 20. Then, both edge
portions 21a and 21b of the incision 21 are put together and temporarily fixed, and then press
heating and molding are performed. This embodiment can prevent the occurrence of wrinkles
and cracks during press heating and forming more than the above-described embodiments.
[0014]
Also, as another embodiment, the lubricant is impregnated in the bonding sheets 10 and 20
before the thermosetting resin is impregnated, and then, first, the press heating and forming for
temporary forming is performed. As a next step, the temporarily molded bonded sheets 10 and
20 are impregnated with a thermosetting resin, and then second press heat molding is
performed. This embodiment further improves the effect of the above-described embodiment.
[0015]
As described above, according to the speaker diaphragm of the present invention, the occurrence
of wrinkles and cracks during press heating molding can be prevented, and a uniform heating
molded product can be obtained. It is possible to prevent temporal changes such as deformation
and cracking after heat molding. Therefore, the speaker diaphragm can be mass-produced, and
when the speaker diaphragm is adopted as a speaker, the sound quality due to natural vibration
of wood can be reproduced without any change with time. According to the speaker diaphragm
of claim 2, the generation of wrinkles and cracks can be further prevented during press heating
and molding.
[0016]
Brief description of the drawings
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[0017]
1 is a diagram for explaining a method of manufacturing a speaker diaphragm according to one
embodiment.
[0018]
2 is a diagram for explaining a manufacturing method of the speaker diaphragm which is the
first conventional example.
[0019]
3 is a diagram for explaining a method of manufacturing a speaker diaphragm which is a second
conventional example.
[0020]
4 is a diagram for explaining another embodiment of the present invention.
[0021]
Explanation of sign
[0022]
10 laminated sheet 10-1 hole 10a wooden sheet 10b non-woven fabric or Japanese paper 10c
resin
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