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JPS5446547

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DESCRIPTION JPS5446547
Description 1, title of the invention
Sound reproduction device cabinet
The present invention relates to the improvement of a cabinet for sound reproduction apparatus
such as a speaker box and a record player. As is generally known, as key A and vignette materials
used for sound reproduction devices such as speaker boxes and record players, it is desirable
that they are difficult to vibrate by themselves, and BMC is a hard BMC material instead of wood.
And resin concrete have been used recently. However, even if these hard materials are superior
to wood in weight and strength, the resonance O sharpness Q of the material itself is large, and
the resonance is sharp in the reproduction frequency characteristics of speakers / stems and the
like using such materials. There was a drawback that resulted in 1lls. In addition, in order to
improve these defects, the fine particles of styrene butadiene rubber and soft polyvinyl chloride
are mixed into resin concrete consisting of a powder of a limestone or an aluminum powder and
a thermosetting resin, etc. to dampen the cabinet material. There is one that raises the rate and
lowers it to Q ', but even if it is possible to lower Q to some extent, if the mixing amount of
rubber etc. is increased, the overall strength can not be obtained when molded, which is
unsuitable as a structure The SUMMARY OF THE INVENTION It is an object of the present
invention to provide a cabinet for an audio reproduction apparatus with less resonance while
maintaining weight and strength. Next, the present invention will be described. In 10 to 40% by
weight of unsaturated polyester, epoxy resin, polyurethane, thermosetting resin such as phenol
EndPage: 1, etc. 50 to 90 of hard inorganic material such as calcium carbonate, glass wool,
alumina etc. What is mixed by weight% and further mixed with 5 to 50% by weight of wood
powder of pine or hemlock etc. is molded into a speaker box or cabinet of a record player by a
conventionally known molding method. FIG. 1 is a partially enlarged sectional view of a cabinet
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frame formed by the above method, in which a hard inorganic substance strip 2 and a wood flour
chip 3 are evenly distributed in a thermosetting resin 1. FIG. 2 is an attenuation characteristic of
a cabinet material molded according to the present invention, in which a pulse signal is applied
to a sample and its attenuation time is measured. The sample used for this characteristic
measurement is 30% by weight of polyester, 50% by weight of calcium carbonate, and 20% by
weight of wood flour (white pine, red pine) and has a specific gravity of 23. FIG. 3 shows the
attenuation characteristics of the conventional resin concrete IJ-t measured in the same manner
as in FIG. The sample used for this property measurement is that of 20% by weight of polyester
and about 8-0 weight of calcium carbonate particles.
From the overall comparison of these two characteristic diagrams, it can be seen that the cabinet
material of the present invention damps the vibration faster than the conventional resin concrete,
and a significant difference is seen in the peak value, and the Q is lowered. FIG. 4 shows an
embodiment in which the present invention is applied to a speaker box, and FIG. 5 shows an
embodiment in which it is applied to a speaker cavity of a speaker. In the figure, 4 is a speaker
unit, 5 is a speaker box formed according to the present invention, and 6 is a sound absorbing
material attached in the speaker box. The reference numeral 7 denotes a back cavity which is
mounted in a speaker box such as 6 to block the back pressure of the woofer against the
squawker. FIG. 6 shows an embodiment in which the present invention is applied to a record
player, in which 8 is a cabinet formed according to the present invention, 9 is a turntable, 10 is a
tone arm, and 11 is a motor. It is shown. Therefore, as described above, in the present invention,
unlike conventional resin concrete of aggregate made of hard inorganic substance and
thermosetting resin, wood powder is mixed in addition to conventionally known aggregate.
Therefore, it can be lowered to Q 'of resonance, and when it is used as a cabinet of the sound
reproduction apparatus, no resonance sieve is generated in the reproduction frequency
characteristic. Moreover, unlike what mixed rubber, a soft resin, etc., since the intensity |
strength is obtained, even if it makes the amount to mix increase, it is realized as a structure.
Furthermore, since the hardness and specific gravity are maintained, which is a good point of the
conventional resin concrete, there is an effect that the cabinet does not vibrate and howling does
not occur.
4. Brief Description of the Drawings FIG. 1 is a partially enlarged cross-sectional view of a cabinet
of the present invention. FIG. 2 is an impulse attenuation characteristic diagram of the cabinet
material of the present invention, and FIG. 3 is an impulse attenuation characteristic diagram of
the conventional example. FIGS. 4 and 5 show an embodiment applied to the all speaker box of
the present invention. FIG. 6 is a view showing an embodiment in which the present invention is
applied to a record player □ cabinet. ■ · · · · · · · · · · · thermosetting resin, 2 · · · · particles of hard
inorganic matter, · · · · · · · · · · · · · · · · · · · · · · · speaker unit, 5 · · · speaker box, of 6 ...... record Playa
cabinet EndPage: 2
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