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The present invention relates to a speaker pawn made of resin concrete in which aggregate is
bonded using only resin as a binder. Heretofore, as the monthly basis of a speaker horn,
thermoplastic resins such as zinc, aluminum or alloys thereof, vinyl chloride, ABS, etc. or
thermosetting resins such as phenol, epoxy, etc. are used. However, the former has Young's
modulus However, since the internal loss is small, the horn resonance is large and the sound
quality is significantly impaired. In the latter, the internal loss is relatively large and horn
resonance is suppressed to some extent, but the Young's modulus is small and not only sufficient
strength can not be obtained, but the horn resonance frequency is lowered to a low frequency,
adversely affecting sound quality is there. The present invention is an improvement of such
conventional drawbacks and will be described below. The present invention is a speaker horn
formed by molding and curing a liquid thermosetting resin or thermoplastic resin obtained by
mixing fine particle light dispersive material and aggregate into a predetermined shape. The resin
as a binder in the present invention is a liquid whose viscosity can be easily adjusted at a low
viscosity number (1 poise or less) mainly from the manufacturing aspect, and it can be easily
mixed with the aggregate, a curing agent, a catalyst, etc. It hardens to solid without heating or
heating by addition of m, evaporation of agent, reaction with moisture in air, etc. and adjustment
of pot life and curing time is easy and can be selected arbitrarily It is required that the amount of
shrinkage upon curing be small and that the influence of temperature and humidity on curing
and workability be small. The thermosetting resin in the present invention includes epoxy resin,
unsaturated polyester resin, furan resin (furfural ascenton etc.), phenol resin, polyurethane, etc.
In the above unsaturated polyester resin system, benzoyl peroxide or the like as a curing catalyst
Methyl ethyl ketone peroxide is used, and further, cobalt naphthenate, dimethyl aniline and the
like are used in combination as an accelerator. From the viewpoint of production, the fine
particles of light filler material and aggregate as an extending material in the present invention
inhibit water-hardening (water content of 0.3% or less) and curing reaction of liquid resin mainly
from the manufacturing aspect. It is required to contain no impurities, to have a small amount of
absorption of the liquid resin, to have a suitable particle shape and particle size distribution, and
preferably to be stronger than the binder resin. In the present invention, as fine particle light
dispersive material, powder such as emery, alumina, silica, quartz, silicon carbide powder,
calcium carbonate powder, slate powder, iron oxide powder and the like can be mentioned.
In the present invention, the aggregate in the present invention includes coarse aggregate and /
or fine aggregate, and as coarse aggregate (5 or more throats), gravel, cobbles, crushed stone,
lightweight aggregate, fine aggregate (5 mm or less) There is river sand, crushed sand, iron sand.
The blending of each of the above materials is to adjust the particle size composition of the
aggregate so as to be close to a close-packed light, and to minimize the amount of resin within
the processing (in-die casting, coating) control range. Become the basis of In general, when the
resin amount is 18% or more, separation, shrinkage, warpage, etc. become remarkable, and, for
example, when the amount of calcium carbonate (C (IcO3)) as the fine particle light carrier
increases, the adhesiveness or flow becomes Generally, the following composition (weight ratio)
is excessive, since the nature becomes large and problems in workability arise. Resin 9 to 17%
fine particle filler (fine powder) 10 to 17% aggregate fine sand 20 to 24% fine sand + gravel 52
to 60% or less, the present invention will be described in detail. Example 1 A mixed solution is
prepared by adding methyl ethyl ketone peroxide and 1% (weight ratio) as a curing catalyst and
0.5% (weight ratio) of cobalt naphthenate as an accelerator to an unsaturated polyester resin. .
15 parts by weight of this mixed solution, 15 parts by weight of fine powder of calcium
carbonate, and 70 parts by weight of river sand of 0.1 to 5 mm are sufficiently stirred and mixed.
Thereafter, it is filled in a horn die of a predetermined shape (injecting method) or coated on the
male face of the horn and allowed to stand at normal temperature for curing, and after curing it
is taken out from the die. In the case of filling into a horn mold by using a casting method, a
female mold (outer mold) is divided, and the divided outer molds are punched and filled while
sequentially stacked. The appropriate implantation thickness is about 5 to 1'O cm per layer. The
horn of the present invention produced in this way is not only extremely encumbered in terms of
mechanical strength (compressive strength, tensile strength, flexural strength), but as shown
below, Young's modulus (It has a Young's modulus comparable to a dyne / J zinc alloy (about
1/4), and has an internal loss (tan α) comparable to that of a polyester resin. Table 1 shows
formulation examples of other Examples 2 to 5. In the table, UP: unsaturated polyester resin, EP:
epoxy resin, as described above, the present invention forms a liquid thermosetting resin or
thermoplastic resin mixed with a fine filler and an aggregate into a predetermined shape. Since it
has a cured structure, has a high Young's modulus, and has a large internal loss, the horn
resonance frequency is high, the horn resonance is sufficiently suppressed, and a good
reproduction sound can be obtained. There is an advantage. Patent applicant Onkyo Co., Ltd.
Attorney Attorney Satoshi Satoshi Department