JP2005168051

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DESCRIPTION JP2005168051
PROBLEM TO BE SOLVED: To obtain a speaker using a wooden speaker diaphragm which does
not generate a crack at the time of press molding and which changes little with time. SOLUTION:
A thin non-woven fabric or Japanese paper 10a is adhered in advance to one side of a wooden
sheet 10a to prepare laminated sheets 10, 20. The bonded sheets 10 and 20 are impregnated
with a lubricant, and then, first, press heating and forming for temporary forming are performed.
As the next step, the temporarily formed bonded sheets 10 and 20 are impregnated with a
thermosetting resin, and then, second press heating and molding are performed to form a
substantially trumpet shape. [Selected figure] Figure 4
スピーカ
[0001]
The present invention relates to a speaker.
[0002]
Heretofore, as a diaphragm of a speaker, those formed of paper pulp and plastic have mainly
been used.
[0003]
Under such circumstances, a wooden diaphragm is desired as a diaphragm capable of
reproducing a sound closer to a more natural sound.
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As a method of manufacturing the wooden diaphragm, for example, a method as shown in FIG. 2
and FIG. 3 is considered.
[0004]
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.
[0005]
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.
[0006]
However, in the manufacturing method as described above, since the sheet is formed of wood
only, there is a problem that wrinkles and cracks are generated at the time of 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.
[0007]
Therefore, the present invention is to provide a speaker that solves the problem of the
diaphragm.
[0008]
Then, in order to solve the above-mentioned subject, the present invention is a lamination sheet
which sticks thin non-woven fabric or Japanese paper on one side of one wooden sheet, and
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contains a lubricant by primary press heating and forming. The temporary-formed laminated
sheet contains a thermosetting resin, is formed into a substantially trumpet shape by secondary
press heating and forming, and is formed into a predetermined dimension by center punching
and outline cutting for a voice coil. A speaker characterized by using a speaker diaphragm.
[0009]
As described above, according to the speaker diaphragm used for the speaker of the present
invention, the occurrence of wrinkles and cracks at the time of press heating and forming is
further prevented compared to the reference example, and a uniform heat-formed product is
obtained. Can prevent the temporal change such as deformation or cracking after heat molding
more strongly than the reference example.
Therefore, this speaker diaphragm can be mass-produced, and the speaker of the present
invention using this speaker diaphragm can reproduce the sound quality due to natural vibration
of wood although it does not change with time.
[0010]
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 a reference example of a speaker diaphragm used
for the speaker of the present embodiment.
[0011]
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)].
[0012]
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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.
[0013]
Thus, the bonding 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 following third step. 1 (c), (d)].
[0014]
Thereafter, the laminated sheet 10 formed in a trumpet shape is punched at its central portion to
form a hole 10-1 corresponding to a voice coil (not shown), and the outer diameter is removed to
form a predetermined diaphragm. It is assumed to be a dimension [Fig. 1 (d), (e)].
[0015]
The front and back surfaces of the diaphragm 10 are coated with a thermosetting resin.
As described above, according to the above reference example, generation of wrinkles and cracks
during press heating and forming is prevented, and a uniform heat formed product is obtained,
and further, temporal changes such as deformation and cracking after heat forming are obtained.
It can prevent.
Therefore, the speaker diaphragm of the reference example can be mass-produced, and the
speaker using this speaker diaphragm reproduces the sound quality due to natural vibration,
which is wood, without any change with time.
[0016]
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Next, a speaker diaphragm applied to an embodiment will be described with reference to FIG.
In this speaker diaphragm, a substantially V-shaped cut 21 and a small hole 22 near the top 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 speaker diaphragm can prevent the
occurrence of wrinkles and cracks at the time of press heating and forming more than the abovedescribed reference example.
[0017]
In the speaker diaphragm applied to the other embodiments, the bonding sheets 10 and 20 are
impregnated with the lubricant before being impregnated with the thermosetting resin, and then,
first, the press heating molding for temporary molding 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. The speaker diaphragm further improves the effect
of the above-described reference example.
[0018]
It is a figure for demonstrating the manufacturing method of the diaphragm for speakers which
concerns on a reference example. It is a figure for demonstrating the manufacturing method of
the diaphragm for speakers which is a 1st prior art example. It is a figure for demonstrating the
manufacturing method of the diaphragm for speakers which is a 2nd prior art example. It is a
figure for demonstrating the diaphragm for speakers used for one Example of this invention.
Explanation of sign
[0019]
10 laminated sheet 10-1 hole 10a wooden sheet 10b non-woven fabric or Japanese paper 10c
resin
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