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JPS5728496

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DESCRIPTION JPS5728496
Description 1, title of the invention
Acoustic structure
3. Detailed Description of the Invention The present invention relates to an acoustic structure
suitable for use in an acoustic device such as a speaker system. As a speaker system, it is
necessary to make a cabinet that constitutes a predetermined enclosure in order to obtain its
sound effects, particularly flat frequency characteristics over a wide area. Peeker unit ? ? ?
The built-in one is widely used. The problem with such a speaker system is to prevent the
resonance (sounding) between the baffle board and the speaker unit when the speaker unit is
mounted on the baffle board or the like provided on the front of the cabinet. And in particular in
a closed loudspeaker system, the inner space of the baffle board is sealed against the outer 4M
space. Therefore, a backing is made to intervene at the joint between the speaker unit and the
baffle board. Conventionally, as a backing material for this purpose, foamed resin molded articles
such as foamed polyethylene, paper, resin sheet, hot melt type thermoplastic resin, etc. have been
used. Among these, foamed resin molded articles, paper, resin sheets etc. It is uneconomical to
waste the material because it needs the mounting adhesive and the like, and it is necessary to
manufacture each by punching. On the other hand, since the thermoplastic resin has a high
viscosity, a dedicated mechanical device is required for the coating, and therefore the versatility
is poor. The present invention has been made in view of such circumstances, and in an acoustic
structure in which a component of @ 1, for example, a speaker unit is attached to a second
component, for example, a baffle board EndPage: 1, A paint containing a bubble-forming agent
and a resin is applied in a predetermined pattern between the first member and the second
member, and the two members are connected to each other via the paint and the two members
are interposed therebetween. The present invention relates to an acoustic structure characterized
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in that air bubbles are caused by the air bubble forming agent in the above-mentioned resin.
Therefore, according to the present invention, the bubble-containing resin can be interposed
between the two members in a very simple and economical manner, and a backing having
excellent adhesion and buffer properties can be achieved. Hereinafter, an embodiment in which
the present invention is applied to a speaker system will be described with reference to the
drawings. FIG. 1 shows the installation of the woofer (1) on a wooden baffle board (2). That is,
the woofer (1) is fitted from the outside (from the top in the figure) into the circular opening
(J2m) provided on the front face of the baffle board (2), and the metallic frame (3) Screwed to
this baffle board (2) through 7 rung parts (4) of
At this time, it is suitable for either one or both of the 7 rung parts (4) of the woofer (1) and the
baffle board (2). A paint (5) consisting of a proper bubble-forming agent and a resin that does not
show tack after curing is applied in a predetermined pattern corresponding to the shape of 7
rung parts (4) by brush, syringe, spray, etc. ing. Then, after the flange portion (4) and the baffle
board (2) are pressure-bonded to each other through the paint (5), the resin is cured and, if
necessary, foamed and bubbles are present in the resin It is Thereafter, as shown in FIG. 2, the
bolt (6) is tightened to fix the woofer (11) to the baffle board (2). As described above, in the
present embodiment, since the paint (5) is applied between the 7 rung portions (4) and the baffle
board (2), the paint (5) or the baffle board (2) is particularly preferable. It flows into the surface
asperities and absorbs the asperities. As a result, the tightness between the flange portion (4) and
the baffle board (2) is improved to effectively prevent sound leakage. Further, since the paint (5)
contains air bubbles, its buffer property is improved, and the occurrence of resonance and noise
is prevented. Furthermore, since the paint (5) only needs to be applied in the required pattern,
there is no waste of the material, and there is no tackiness after curing, so the 7 rung (4) to the
baffle plate (2) There is no risk of being connected to the unit, and replacement of parts is easy.
In the paint (5) of this embodiment, a resin in which a suitable foaming agent is mixed, for
example, a mixture of a suitable foamed powder and a non-vulcanized butyl rubber and dissolved
in a solvent, or 8BR A suitable mixture of synthetic rubber latex, vinylidene chloride spherical
foam particles, polyethylene imine and the like can be used. These materials are applied in a state
in which a foaming agent is prefoamed in advance, and after pressure bonding of the 7 part (4)
and the baffle board (2), the material is heated, for example, to 80 to 180 ░ C to cure the resin.
It is preferable to make the blowing agent final foam at the same time. If this is done, the paint
(5) expands appropriately with 7 Lang g (4R: baffle board (2) to absorb surface irregularities
more effectively, so the adhesion between the two is one. ! -It becomes good. Of course, the paint
(5) may be applied and then allowed to foam in a state where it does not cause foaming, or may
be applied in the final foamed state. In the latter case, the heating step is not particularly
required, and hence curing of the resin may be carried out by UV irradiation or by standing at
room temperature, if necessary.
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On the other hand, it is also possible to use, as the paint (5), one obtained by mixing and
dispersing microcapsules made of a glass balloon containing a gas, a thermoplastic resin or the
like in a non-adhesive resin such as resin or acrylic It can. In this case, heating other than curing
of the resin is not necessary, but for example, the microcapsules may be broken and used by
heating. As mentioned above, although the embodiment which applied this invention to the baffle
board (2) of the woofer (1) in a speaker system was demonstrated, this invention is another
speaker unit, for example, the unit board for high frequency tweeters. It can also be applied to
the case of mounting on cabinets, and also to the installation of cabinets and terminal boards,
and cabinets and unit boards. Further, as shown in FIG. 6, the present invention may be applied
when the duct (7) in the bass reflex type speaker system EndPage: 2 is attached to the baffle
board (2). Furthermore, as shown in FIG. 4, the present invention can also be applied to the
joining of the frame (3) and the yoke (8) in the speaker unit (1). As described above, in the
present invention, a paint containing a bubble-forming agent and a resin is applied between the
tal member and the second member that need to be attached. Therefore, according to the present
invention, the backing between both members can be performed without using a necessary
separate member such as an adhesive. In addition, since the paint or the unevenness between the
two members is effectively absorbed, the sealing performance becomes poor and sound leakage
is effectively prevented. Also, since the paint only needs to be applied to the required pattern,
there is no waste of material, and therefore it is economical. In addition, air bubbles generated by
the air bubble-forming agent effectively contribute to the cushioning property and exert an
excellent buffering action.
4. Brief description of the drawings shows an embodiment of the present invention, FIG. 1 is a
longitudinal sectional view showing how the woofer is attached to the baffle board, and FIG. 2 is
a part showing the attached condition. FIG. 4 is an enlarged longitudinal sectional view of a
speaker unit according to a modification of the present invention, and FIG. 4 is a longitudinal
sectional view showing a state in which a duct is attached to a baffle board. In the reference
numerals used in the drawings, (2+....... Baffle board (4)... ииииииииииииииииииииииииииииииииииии It is a duct. Attorney
Saturn I Tsukuta Hiroshi Tsuka Matsuda EndPage: ?
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