JP2005117697

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DESCRIPTION JP2005117697
PROBLEM TO BE SOLVED: To obtain a wooden speaker diaphragm which causes no cracks at the
time of press molding and which has a little change 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
Speaker diaphragm
[0001]
The present invention relates to a speaker diaphragm that is adopted as a speaker and is suitable.
[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
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reproducing a sound closer to a more natural sound.
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 intended to provide a diaphragm for a speaker that solves the
above problems.
[0008]
Then, in order to solve the above-mentioned subject, the present invention is a lamination sheet
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which sticks thin non-woven fabric or Japanese paper on one side of one sheet of wood sheet,
and contains a lubricant, and it is temporary. It is an object of the present invention to provide a
speaker diaphragm characterized in that the formed bonded sheet contains a thermosetting resin
and is formed into a substantially trumpet shape by secondary press heating and forming.
[0009]
As described above, according to the speaker diaphragm of the present invention, the occurrence
of wrinkles and cracks at the time of press heating and forming is further prevented than in the
reference example, and a uniform heat formed product can be obtained. It is possible to prevent
the temporal change such as later deformation or cracking more strongly than the reference
example.
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.
[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 the speaker diaphragm
according to 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 reference example of 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 after heating molding It
is possible to prevent time-dependent changes such as deformation and cracking.
Therefore, the speaker diaphragm of the reference example can be mass-produced, and when
this speaker diaphragm is adopted as a speaker, the sound quality due to natural vibration of
wood can be reproduced without change with time.
[0016]
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Next, one 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 at the time of press heating and forming more than the above-described
reference example.
[0017]
Further, as another embodiment, before the bonding sheets 10 and 20 are impregnated with the
thermosetting resin, they are impregnated with a lubricant, and then, first, press heating and
molding for temporary molding are 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-mentioned
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 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
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resin
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