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The present invention relates to a novel acoustic material for a speaker diaphragm material, such
as a dust cap or the like, for a novel forming material such as a dust cap. After being formed into
a u1 plate shape, those obtained by hot press forming are widely used. Such a diaphragm has an
advantage of small apparent '&' due to the space between fibers, but the rigidity (Young's
modulus) is small, and in order to reduce this, coating or laminating a synthetic resin is required.
Although the rigidity is increased, the density is significantly increased to a rate that does not
increase, <the defect is that it increases, and because the internal loss is small, the generation of
harmful peaks and dips in the frequency characteristics is sufficiently suppressed It was difficult
to do. In recent years, thermoforming and diaphragms have been developed for thermoplastic
resin films such as polypropylene and polyethylene. The 1-1 plate of this pupil has an advantage
that it is suitable for large size i production because it is very simple to form, and pc has a large
internal loss, good energy absorption of vibration i11, divided vibration w1 etc. Due to the
harmful characteristics on the frequency characteristics, to suppress the dip l) Tohda, but the
density is large and the Young's modulus is small, 1'7 compared to the paper fence 1 plate
However, none of them were satisfactory for still water as a diaphragm. The present invention
solves the disadvantages of the above-mentioned conventional example! A diaphragm, which is a
thermoplastic resin, in particular a polyolefin resin or a copolymer of this with another synthetic
resin, and an inorganic 'powder, and is a diaphragm formed by thermoforming a film having
small pores Is. The above will be described in detail. A mixture of 5 parts by weight of
polypropylene and 95 parts by weight of titanium dioxide (TjO) powder is mixed to form pellets.
The beret is melted at a high temperature and formed into a film by extrusion or the like, and
then stretched while the film is not completely solidified. Film 1 at the time of extrusion molding
is as shown in FIG. 1G, and titanium oxide powder 1b is substantially uniformly mixed in
polypropylene la. でいる。 When this is stretched, as shown in FIG. 2, a film 2 in which pores are
completely formed by the tensile force due to the stretching is formed around the titanium oxide
powder 2. The film 2 is formed into a sheet of egg 1 using vacuum, pressure or other 1732shaped means. When a part of the diaphragm thus obtained was cut out and the characteristics
of the diaphragm material and the conventional diaphragm material were compared, the results
shown in the following table were obtained. However, sample (2) was obtained by forming 7lanes 500 NBKP and then heat-pressed at 4 Kg pressure, (2) was obtained by densifying a
polypropylene film, 7 and tan δ was measured by the & -1 lead method.
As can be seen from Table F, the present invention '54 swing U + b ■ has a very small decrease
in internal loss (tan δ) of polypro and its reverse bending. Although it slightly increases, the
internal loss significantly increases ((1), the self-resonance of the vibrating plate 1 is suppressed,
and it has a remarkable effect in obtaining a flat frequency characteristic at ~. The diaphragm ■
of the present invention is a diaphragm in which the diaphragms of ■ are laminated in three
layers, and the Young's modulus is increased compared to the paper fiber diaphragm ■ and
compared to the polypropylene ha plate ■, and the internal loss ( tan δ) also increases as
compared to the paper fiber IJl IJ board (4). Furthermore, although the density also increases as
compared with the sample 1 and the sample 3, the density is smaller than the rate of increase of
the Young's modulus, so E /! From (E: Young's modulus !!: density), blurring is significantly
improved. The present invention can be applied to polyolefin-based synthetic resins such as
polyethylene and polybutene in addition to polypropylene, and thermoplastic resins containing
these, and in addition to ditin oxide, powders of carbon, ceramic, glass, etc. Hollow spheres can
be used. Furthermore, particularly when using a synthetic resin with poor adhesiveness such as a
polyolefin-based synthetic resin, apply primer treatment with a urethane resin or the like to
which the film surface has been subjected to activation treatment such as several times of
corona, and measure 7 board adhesion. Is desirable. The above-described invention is applied to
a speaker a1 plate and 1. a. This method can be applied to dust caps which are chopped in
association with chopsticks 1 or to center-mula shakes or the like in which the dust camps are
positively splashed to act as radiators. It is needless to say that it is viJ2 bite of. As described
above, the present invention is a film obtained by mixing and extruding a thermoplastic resin and
an inorganic powder. A moving plate obtained by thermoforming a film in which voids are coated
in the vicinity of the powder by stretching in a history, and it is rigid or large, and its vibration
energy is good, And, it is possible to obtain a common diaphragm-1 plate, and a speaker
equipped with such a diaphragm has an advantage that the conversion efficiency is good and the
frequency characteristic carried by r) can be obtained.
Brief description of the drawings
FIG. 1 is a cross-sectional view of a film used for the kmJ plate of the present invention, in front
of a daughter, and FIG. 2 is a cross-sectional view after spreading.
la is a thermal 5 T plastic resin, lb is an inorganic powder, l is a film, lc is a void, and 2 is a film.
11th shoulder chrysanthemum 2 mouth
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