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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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financial decisions, should not be based on machine-translation output.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the speaker cabinet of
the present invention, FIG. 1 shows its sectional view, and FIG. 2 shows its two-color molding
apparatus. 1.2 ...... cabinet, 3 ...... opening 4 ...... speaker, 5 ...... backing layer, 6,7,8 ..... · Mold, 9.10
· · · · · · · · · · · · · · · · · · · Runner, 11 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · runners, 11 · · · · · · the outer case portion of the cabinet, 12 · · · · · · · · · sound
absorbing layer portion.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker cabinet
which is characterized in that it is formed at one time by using a cabinet and a sound absorbing
material provided on the inner wall of the cabinet and a seven-color molding technique.
Conventionally, in order to absorb acoustically undesirable sound waves generated inside of a
speaker cabinet made of a synthetic 411Il fat material, a sound absorbing material such as
polyurethane foam has been attached to the inner wall surface, but its workability is It is bad for
mass production. In the present invention, when molding a cabinet, among them, JljC: f! l “9”
10 ”85” 7114 to effectively absorb the above-mentioned undesirable sound waves and to
provide a nine speaker cabinet which improves the workability which is the conventional
drawback. is there. Hereinafter, one embodiment will be described in detail with reference to the
drawings. In the s1 diagram, the speaker cabinet is constructed by overlapping the divided boxlike cabinets (1 to 2), and one of the cabinets (the opening (3) K of the crucible is fixed the
speaker (4) from the inside) . Most of the sound waves generated from the loudspeaker force are
emitted outside the cabinet from the front opening (3) of the speaker, but a part of the sound
waves are emitted toward the inside of the cabinet. In this cabinet, it is desirable that the sound
wave generated by the Kf 4 elbow be completely absorbed by the sound absorbing layer 15) K
formed on the inner wall of the cabinet. As the sound absorbing layer, generally, soft and elastic
porous materials such as urethane foam are well known, but their use has the above-mentioned
drawbacks. A feature of the present invention is the use of a two-color molding technique to
construct this sound absorbing layer to ameliorate the disadvantages of the prior art. That is, in
FIG. 2, first, a portion corresponding to the outer case of the cabinet is made of a thermoplastic
polyester resin called "Tough-Pattern" as an example of a hard synthetic resin material. Up and
down money! Between the IN (6) (7) and the runner (9) through injection molding Polyester pv @
fat to make the outer case part Uυ of the cabinet. Next, remove the upper mold (7) from the
upper mold (6), and replace it with the second upper mold (8) with its f gold! Match 1lk 6). At
this time, the outer case portion of the cabinet which has already been formed remains inside.
The second upper mold (8) has such a shape that the sound waves generated in the cabinet can
be most effectively absorbed in consideration of the mounting position of the speaker (4) and the
parts to be embedded in the cabinet. The surface is pre-processed to be
A polyester elastomer having a trade name of Berderento is injected as an example of a synthetic
resin material which is made more resilient than the runners of the second upper mold (8), and is
molded in two colors. Then, if it is apparent as an advantage of two-color molding, the <r4
molding material is in a bonded state, and the hard outer case portion uI of the cabinet 4 and the
elastic sound absorbing layer portion (2) are integrally configured. (Refer to Fig. 2 (2).) When the
sound absorbing layer is molded in two colors, adding a filler to the polyester elastomer
corresponding to the sound absorbing layer changes the elastic modulus within the range that
does not impair the sound absorbing property Alternatively, it is possible to change the shape of
the second upper mold and optionally change the thickness of the sound absorbing layer to
prevent local resonance of the outer case of the cabinet. In order to further enhance the sound
absorbing effect, it is possible to form a large number of small holes on the surface of this sound
absorbing layer, and furthermore, at the time of two-color molding of the sound absorbing layer,
a foaming agent is added to the polyester elastomer to absorb the sound It is also possible to
make the layer porous. According to the present invention, the sound absorbing layer is
integrally formed by two-color molding of an elastic synthetic resin on the inner surface of the
hard synthetic resin frame corresponding to the outer case of the button speaker cabinet
described above. The sound wave in the cabinet can be absorbed effectively, and a speaker
cabinet such as a radio receiver with excellent acoustic characteristics can be provided as a
whole, and the production of the speaker cabinet 5 net can be facilitated with a large width WcS
compared to the prior art. It has the feature of being able to mass-produce a practical type
cabinet with constant quality.
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