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[Yes] Speaker cabinet trial Showa 50-6613 Saka 45-72335 [Phase] Application 45 (1970) August
20 @ Inventor Hiroshi Matsumoto - Fukuroi City Takao 2440 Takao Yasuhiro Shizuoka
prefecture Iwata gun Toyota village Ikeda 12140 Applicant Pioneer Corporation Tokyo Meguroku Meguro 1 4,
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway side view of one
embodiment of the present invention, FIG. 2 is an enlarged sectional view of the same part, and
FIG. 3 is an enlarged sectional view of a part of another embodiment .
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker cabinet
in which a portion for maintaining the strength of a box main body and a portion for a sound
absorbing material are integrally molded using a foamable resin. Conventional loudspeaker
cabinets have woods frequently used as box bodies because physical characteristics of trees are
suitable for acoustic boxes, but there are disadvantages such as a large number of man-hours
required for assembly and uneven products, and Since a sound absorbing material made of felt,
glass wool or the like is affixed to the inner peripheral surface of the box body, there is a
disadvantage that the number of steps required for this is large. SUMMARY OF THE INVENTION
The present invention has been made to solve the above-mentioned drawbacks, and it is an
object of the present invention to provide a method of manufacturing a box body in which only
the front surface is opened by foamable synthetic resin, The sound is blocked at the outer part,
the resonance is prevented, the strength is maintained, and the work piece having the work piece
as the sound absorbing material at the inner part can be mass-produced easily with a small
number of steps. BRIEF DESCRIPTION OF THE DRAWINGS FIG. In Figures 1 and 2 (·, 1 is the
front opening [111111]) It is a box body that mouth, keeping the strength as foaming of the low
part rate on the outside, as foaming with high magnification as the intention wants And it is
integrally molded with a foaming co-operative resin with a sound absorbing action, and it is also
possible to mold the reinforcing machine 2 made of metal, if necessary, embedded in the low
foaming portion as necessary. As shown in FIG. 2, each plate portion such as a side plate and a
top plate of this box main body 1 is made to have different thicknesses of the low foam layer and
the high foam layer depending on the part so as to form corrugated irregularities, The
reinforcement and sound absorbing effect is increased by forming unevenness on 1a. 3 is a
speaker bud totally formed by synthetic resin, a speaker 4 is attached to the baffle 3, the front
opening of the box body 1 is covered, and the baffle 3 is fixed to the baffle 3 with a screw or an
adhesive agent . In FIG. 1, reference numeral 5 denotes a manpower terminal attached to the box
body 1. In addition, what is shown in FIG. 3 is a side plate of the box body 1, a top plate or the
like to increase the irregularities of each plate portion in a wedge shape so as to improve the
sound absorbing effect. INDUSTRIAL APPLICABILITY As described above, according to the
present invention, since the box main body having only the front opening opened by foamable
synthetic resin is integrally molded and the outer portion thereof is low foaming and has high
foaming as it reaches the inside, It is unnecessary to separately attach a sound absorbing
material due to the sound absorbing effect of the inside high foaming portion as well as the box
main body can be obtained by the molding work of times and it is possible to remarkably reduce
the man hour as compared with the conventional wooden product, Products can be obtained.
Also, by appropriately changing the foaming ratio between the outer part and the inner part, or
by inserting the reinforcing material, the strength and the sound absorbing action can be
appropriately adjusted. According to the present invention, the outer peripheral surface of the
box body can be made to have an appearance which is almost the same as that of a wooden
product by embossing a wood grain pattern, performing colored printing, and the like, so that the
appearance is also made into a wooden product There is no difference in comparison.
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description, jps5241048
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