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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker in which a material which has not been used before is processed and
finished by a processing method which has not been used for the material.
2. Description of the Related Art A conventional speaker diaphragm for a paper speaker of this
type has a large amount of water in a cross sectional view (FIG. 4) showing a paper making
process of the prior art example and a cross sectional view (FIG. 5) showing a molding process of
the prior art example. A stock 14a made of a diluted beaten paper pulp 14 made into a
predetermined outer shape by a mold 16 mounted on a paper making apparatus 15, for example,
a male type and a female type heated by a heating wire 5 The dry mold is carried out using the
heating molds 17a and 17b.
Alternatively, a green thin plate of a thermoplastic synthetic resin is molded by the heating and
pressing molds 17a and 17b having the same shape as described above, and furthermore, a
mixture of mica flex and the like and various chemicals are mixed with the above raw materials
such as polypropylene. The unfoamed thin plate molded as it is or as it is or coated on the
surface and solidified to form a protective film, and further, a thin plate obtained by heating and
foaming a thermoplastic synthetic resin such as polystyrene is molded, etc. There was a
diaphragm etc. which processed it.
Therefore, in the conventional speaker diaphragm of this type, in addition to the inherent mass of
the raw material like polystyrene, the weight of additives and chemicals added during processing
is added. The problem is that the weight of the diaphragm increases, or the weight and density
decrease due to foaming, but there is a problem that the brittleness increases.
In addition, in such a foam diaphragm for a speaker, it takes time and labor for procuring
processing chemicals and processing steps, etc., and all these diaphragms have physical
characteristics as a diaphragm, in particular, the density. In terms of Young's modulus,
propagation speed, internal resistance, etc., satisfactory products have not been obtained, and
there has also been a problem that it is difficult to equalize the quality.
Therefore, in order to solve the problems of the conventional foam diaphragm for a speaker, the
present invention, as shown in FIGS. 1 and 2, raw thermoplasticity which has not been used as a
raw material until now As a synthetic resin, a polyolefin resin 1 represented by polypropylene
was adopted, and the foam was selected as a main component.
In addition, it mixes with foaming agent 3a, an extending agent, a shape retention material, etc.
as needed, forms in a foaming sheet shape, and further it is sandwiched between heating molds
2a and 2b, and it heat-molds in a required shape. Thus, the diaphragm made of a foam having
heat resistance, moisture resistance, gas resistance, vibration resistance, and breaking resistance
as a speaker diaphragm is used as a diaphragm made of a foam and incorporated in the speaker
to contribute to the improvement of the reproduction sound quality of the speaker. It is intended
to be provided.
The constitution of the present invention for achieving the above object will be described with
reference to FIGS. 1 to 3 corresponding to the embodiments. The main component of the
polyolefin resin 1 is added with a foaming agent 3a, and the volume is increased by foaming in a
heating furnace, the sheet is formed and taken out, and the sheet is further heated by a heating
molding die 2a, 2b. It is a diaphragm for a speaker which has been molded or thermoformed into
a required shape by vacuum molding or pressure molding.
Moreover, while adding the foaming agent 3a to the above-mentioned material, increasing the
amount of carbon 3b, talc 3c, mica 3d, etc., imparting rigidity, and adding a shape-retaining
material, and further adding a coloring material 3e as required, heating furnace The foaming
degree is expanded to 4 to 6 to increase the volume, and the sheet is formed and taken out, and
the sheet is further heated to a desired shape by vacuum forming or pressure forming using the
heat forming molds 2a and 2b. It is a molded diaphragm for a speaker.
The present invention is a diaphragm formed by causing such polyolefin-based polypropylene 1
to foam at a low degree of foaming 4 to 6, and therefore, when incorporated into a speaker, it
can be used in the same manner as a conventional paper diaphragm. it can.
Therefore, the speaker diaphragm of the present invention has physical properties such that the
density is small, the Young's modulus is large, and the internal loss (tan δ) is large. As a result,
when incorporated in the speaker, the electroacoustic conversion efficiency is remarkable. It is
possible to improve the distortion and suppress the reproduced sound distortion as much as
As a result, it is possible not only to withstand large electric power input, but also to improve
weather resistance such as moisture resistance, heat resistance, hydrophobicity and light
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
In the drawing, FIG. 1 is a layout view showing a mode in which the foamed synthetic resin sheet
12a is inserted between the assembled male and female heating molds 2a and 2b and heat and
pressure are formed.
FIG. 2 is an enlarged cross-sectional view of the outer shape of the diaphragm 1a generated by
the manufacturing apparatus of FIG. 1 and a part thereof. FIG. 3 is a cross-sectional view showing
a structure in which the diaphragm 1a of the embodiment of FIG. 1 is attached to the speaker 20.
As shown in FIG. 4 and 5 are diagrams showing a method of manufacturing the paper diaphragm
14a of the conventional example.
In FIG. 1, 12a is a sheet of a polyolefin resin material obtained by heating and pressure-foaming a
polyolefin-based thermoplastic synthetic resin, and during foaming, if necessary, a foaming agent
3a, carbon 3b, talc 3c, mica 3d, etc. And the shape-retaining material 3 or the coloring pigment
3e are mixed and molded. Then, the input thermoplastic thermoplastic synthetic resin raw
material is mixed with another mixture in a heating melting furnace and melted, and passes
through a die to form a sheet 1 having a foaming degree of 4 to 6 and a thickness of 1 to several
mm. Molded as.
When the sheet 12a thus obtained is further pressed from above and below by the molds 2a and
2b heated by, for example, the heating wire 5, the sheet 12a is deformed by pressure heating in
the gaps in the heating and foaming molds 2a and 2. Then, the molding process is finished to the
outer shape according to the shape of the mold 2a, 2b. Then, when the cooling water is inserted
into the cooling pipe 6 and lowered to a certain temperature, it can be taken out as the
diaphragm molded article 1a of the polyolefin resin material having a shape conforming to the
shape of the molds 2a and 2b. Further, in the above-mentioned thermal molding, it can be led to
the reduced pressure source 7 by the conduit 7a disposed in the female mold 2b and molded by
vacuum molding or pressure molding.
Similarly, a foamed polyolefin thermoplastic synthetic resin diaphragm 1a made of a mixture of
polyolefin resin material 1 with carbon 3b, talc 3c, mica 3d, pigment 3e and the like is
Then, the diaphragm 1a completed in this manner becomes a diaphragm 1a having physical
characteristics in which the values of density, Young's modulus, and internal loss (tan δ)
maintain optimal values as a diaphragm.
That is, since it is a foamed synthetic resin body, it has a density of 0.11 to 0.36 (Kg / m3), which
is a much smaller value than that of the conventional diaphragm, which contributes to the
improvement of reproduced sound pressure, Young's modulus is 0.83 × 108 to 4.0 × 108 (N /
m 2) and has high rigidity, so the propagation velocity shows a high value of 2,746 to 3,333 (m /
sec) Helps to maintain high overall electro-acoustic conversion efficiency.
The internal loss (tan δ) is also an appropriate value as a diaphragm of 0.052 to 0.035, and
absorbs a reflected wave of vibration to suppress distortion sound.
The degree of foaming of the diaphragm of the present invention is optimally 4 to 6 in order to
retain the above-mentioned physical properties.
And, the diaphragm with the pigment added makes it difficult to expose the front surface to
adsorb dust in the air, it is free to color, it can be easily subjected to surface treatment, always
has a beautiful luster, and is also designed Aesthetics can be exhibited to enhance the
commercial value of the speaker. In addition, by blending carbon black and an organic UV
absorber for the purpose of UV resistance deterioration, excellent weather resistance can be
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 includes the above-described components according to the present invention,
and the present invention In order to achieve the purpose mentioned above, the present
invention can be suitably modified and implemented within the range having the effects
mentioned below.
As is apparent from the above description, the present invention is mainly selected from raw
thermoplastic synthetic resin mainly composed of polyolefin resin 1 represented by
polypropylene, and, if necessary, it is increased and maintained. Since the shape material is
mixed, it is formed into a sheet 12a, and then it is heat-formed by the heating molds 2a and 2b,
so it is suitable for mass production, and inexpensive and the finished dimensions are always
uniform. Notable for the conventional diaphragm 1a, which can improve the reproduction sound
quality as the homogeneous loudspeaker 20 by maintaining the physical properties and
properties without unevenness as the loudspeaker diaphragm 1a. It came to have a good effect.
Further, since the diaphragm 1a of the present invention is made of a chemically stable
thermoplastic resin which is easily available and inexpensive as a raw material, it retains heat
resistance, moisture resistance, gas resistance, vibration resistance and destructive strength. It is
also possible to expect the effect of being able to have the physical properties required.
Furthermore, the step of molding the raw material 1 into the diaphragm 1a is simple, and the
uniform diaphragm 1a can be obtained inexpensively with a small number of steps, without
requiring special skill.
Brief description of the drawings
1 is a cross-sectional view showing an embodiment of the manufacturing process of the present
2 is an external view and a partially enlarged cross-sectional view of the embodiment of FIG.
3 is a cross-sectional view of the embodiment of FIG. 1 attached to a speaker.
4 is a cross-sectional view showing a papermaking process of the conventional example.
5 is a cross-sectional view showing a molding step of the conventional example.
Explanation of sign
Reference Signs List 1 polyolefin resin material 1a molded product diaphragm 2a molded male
mold 2b molded female mold 2c heating device 3 mixing material 3a foaming agent 3b carbon
3c talc 3d mica 3e pigment 4 decompression device 5 heating wire 6 cooling device 7
decompression device 7a conduit 20 speakers
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