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(2,000 yen) '· · · 7' thousand ', · · · YOU patent application (1) 2, inventor SHIGANA 1ll I 11 +
Uchiyakodo for parts for goods 6 - 7, No. 4, attorney 〒 160 [Phase] Japan Patent Office {circle
around (1)} Japanese Published Unexamined Patent Application No. 50-6521.50 Publication date
50. (1975) 6.2 ■ Japanese Patent Application No. 48-113 Yu 3? Office internal reference
number 644-55 is tightly fixed to the back of the buckle plate (7). Further, the present invention
relates to a cabinet for audio equipment, and it is intended to provide a cabinet for audio
equipment most suitable for application to speaker cabinets, in particular. Conventionally, as
such a cabinet, there is one such as shown in FIG. 1. This cabinet (1) is formed in a rectangular
parallelepiped box shape as a whole by a pair of upper and lower top plates (2) and a bottom
plate f 3], a pair of left and right side plates (41 + 51, a back plate (not shown), and a buckle plate
. A circular hole (8) is provided in the batts / L / plate (7), and a saran net (6) is closed like a
speaker (not shown) (1) so as to close the hole It is attached. In this cabinet (1), the top plate (2),
the bottom plate (3), the side plates (41 + 51 and the back plate are made of natural wood as raw
material, plywood made of two or more layers, wood chips and thermosetting (9) flo + [1 υ H is
coated with an adhesive such as vinyl acetate, area resin or the like and bonded to each other.
However, the natural wood has very low specific gravity ρ (for example, about 0.5 around 2) so
that the sound insulation characteristic of 11 becomes very bad. In other words, the sound
insulation characteristic is generally proportional to the areal density m (m - density d × plate
thickness h) of the constituent material of the cabinet in the mid - treble region, but because the
d or p is very small, the sound insulation characteristic deteriorates. Since it is also inversely
proportional to the weight of the plate vibration of the cabinet, it is generally inversely
proportional to its weight, so ρ is very small, so the vibration level will be high. In addition,
sound insulation characteristics of a cabinet that is two in the mid and bass range + 91 EndPage:
1 is proportional to e and Young's modulus E, E of natural wood is pretty good on the order of
109 \ As mentioned above (P is very Since it is small, the sound insulation characteristic is also
deteriorated. Furthermore, since the resonance sharpness Q of natural wood is 30 to 60 which is
very large, the internal loss is small and the vibration decay time is long, so that a cabinet sound
is generated by resonance sound.
In general, the vibration decay time is proportional to Q / f (where f is the resonance frequency),
so Q needs to be reduced by increasing f. However, since Q of natural wood is large, f becomes
very high when the vibration decay time is made constant. Nevertheless, in order to manufacture
the cabinet (1), it is extremely troublesome to manufacture the ceiling board (2) etc. by cutting
them to a predetermined size and bonding them together. In addition to the natural woods
mentioned above, plastics (for example, styrofoam resin) -based artificial timber is used as a
medium constituent material, P of this artificial timber is about 0.2, E is about 5 × 10, Q Is
inferior to the above-mentioned natural wood at 40 to 65, so it is very unsuitable as a cabinet
constituting material. This issue F! A has been invented to remedy the above-mentioned defects,
and it has been invented, and it has been invented that the main aggregate containing an
inorganic substance as a main component, the sub aggregate containing an organic substance as
a main component, the main aggregate containing an inorganic substance as a main component,
And a binder contained as an ingredient of the cabinet for acoustic equipment. By configuring
like this, it is possible to improve the sound insulation characteristic, lower the vibration level,
prevent the box ringing phenomenon, simplify the manufacturing process and reduce the cost as
well. As inorganic substances mentioned above, granite, slate, metamorphic rock, gravel etc.
widely produced in nature, pearlite, shirasu, pumice, shirasu balloon and the like may be used. As
the above-mentioned organic substances, rubber materials such as butadiene acrylonitrile
rubber, butadiene styrene rubber, petitbum and the like, polymer fibers, cork, wood chips, wood
chips, waste paper and the like may be used. 2 The mixing ratio (weight ratio) of the abovementioned main aggregate, sub-aggregate and binder is as follows: main aggregate: secondary
aggregate: binder - (0, 2 to 2) :( 0, 0 to 0.5 ), :( 1, 5 to 3). However, cement: water-1: (0, 5 to 2)
may be used. Next, an embodiment in which the present invention is applied to a speaker cabinet
will be described with reference to FIGS. 2 and 3. First, the configuration of the cabinet (21) will
be described. The cabinet (2) has a top plate, a bottom plate (top), a side plate (24) (251 and a
front plate (goods) . Since the front plate □ □ □ is used as a buckle plate, this face plate (goods)
is provided with a circular hole (c), and the speaker is mounted so as to close this hole (2 ~ . In
addition, a saran net (not shown) is attached to the entire front face of the front plate (2 (U)).
The rear side of the cabinet (21) is a rectangular opening (goods) and is attached so that the back
plate closes this opening (as described later). The cabinet @ υ is manufactured using the mold
shown in Fig. This gold We2 (support) is composed of the inner mold - and the outer Mli @ 11,
the inner mold - regulates the inner wall surface of the cabinet) (21), and the outer snow hill υ
regulates the outer wall surface of the cabinet @ η As shown in FIG. The inner mold - has a
circular hole (3 scents are provided corresponding to the hole (c) of the face plate (good). First, a
mixed solution (83) having the following composition is injected into the gap in a state where the
inner mold and the outer mold are placed with a predetermined gap. This mixed liquid has a
main aggregate composed mainly of a granular silas having an average particle size of 2 mm or
less, for example 0.5 mm or less, a sub aggregate composed mainly of granular butadiene
acrylonitrile rubber having an average particle size of 2 mm or less , Cement and a binder
containing water as a main component and may have a weight ratio of Shirasu: Butadiene
acrylonitrile rubber: cement: water-1: 0.2: 1: 1. In addition, a small amount of emulsion of
another water-soluble binder, for example, acrylic, polyester or epoxy resin may be mixed in the
mixed solution (33). After injecting the mixture, pressurize the inner mold and external υ υ to
compress the liquid mixture (3) and then leave it in the End Page: 2 state, thereby curing the
mixed liquid (ε) into a predetermined shape . After that, we can integrate the middle jabinet @ υ
as shown in Fig. 2 by extracting the inner and outer O υ. Then, a speaker (not shown) is then
mounted so as to close the hole (c) in the five-sided integrally formed cabinet shown in FIG. 2,
and the back plate - indicated by imaginary lines on the rear side of the cabinet Attach with
screws. In the thus constructed cabinet restraint η, the top plate (a), the bottom plate (231, side
plate (company) (company) and the front plate X which are integrally formed are made of
shirasu, rubber, Since it is composed of cement etc., the specific gravity p becomes about 1.5,
which is much larger than the specific gravity (O, S) of natural wood. Therefore, the sound
insulating characteristic of the cabinet becomes extremely good and the t round plate vibration
level can be greatly lowered. Further, since P becomes large, the Young's modulus E becomes an
order of 109 or more, and the rigidity of the cabinet increases. Therefore, the resonance
frequency of the cabinet can be increased. Furthermore, since rubber is used as a sub-aggregate,
the resonance sharpness Q of the cabinet becomes 25 ° and becomes much smaller than that of
natural wood (60 to 60).
For this reason, it is possible to increase the internal loss and completely prevent the acoustic
output that can be radiated from the cabinet, it is possible to eliminate the so-called boxing
phenomenon, so Q can be reduced to about 25 so that vibration of the cabinet It is possible to
suppress the decay time to, for example, 50 milliseconds or less. Moreover, since the five sides of
the cabinet @ Ul are molded integrally, it is possible to provide a cabinet which is extremely
simple in process as compared with the conventional fabrication method and which is precise in
size. At this time, the cement used as the binder is very inexpensive and is advantageous also in
terms of the press. Since the cement is water-soluble, the viscosity can be easily adjusted, so that
the cement is more compatible with gold, and therefore the formability is extremely good.
Although the present invention has been described with reference to the above embodiments, it
will be understood that modifications can be made on the basis of the technical idea of
present invention. 0 For example, it is possible to use the main aggregate, sub- By varying the
weight ratio between. It is possible to set the specific gravity p to the range of 0.5 ≦ p ≦ 1.5, the
Young's modulus E to the order of 109 or more and the resonance sharpness Q to 40 or less, To
9, wide range of freedom in the physical properties of the cabinet You can have a degree.
Moreover, these physical properties can be changed variously depending on the bushness of the
spikenenite, the required performance and the like. Furthermore, it is also possible to constitute
one in which the middle yabinet is integrally molded on four sides, that is, one in which the top
plate, the bottom plate, and the side plate are integrally molded. In this case, a buckle plate
comprising the mixture according to the present invention as a constituent material or a
conventionally used wooden buckle plate may be attached to the front side, and a back plate
made of a material similar to this is also applied to the rear face Even if it is attached (9) - 0
origin 8A, as mentioned above, the main aggregate containing the inorganic substance as the
main component, the sub aggregate containing the organic substance as the main component,
the cement and the water respectively As the cabinet is manufactured by molding a mixture with
the binder contained as the main component, it is possible to increase the specific gravity of the
cabinet and to make this sound insulation characteristic extremely favorable and to increase the
vibration level It can be reduced to width. Further, it is possible to increase the rigidity of the
cabinet and to increase the resonance frequency, so that the sound insulation characteristic is
good also in the frequency band to be used. Further use of Kw & aggregate can make the
resonance sharpness of the cabinet very small and increase its internal loss, thereby completely
preventing the acoustic output emitted from the cabinet.
Since the cabinet can be integrally molded, the manufacturing process can be simplified.
EndPage: 3 can make it possible to use cheap one as the constituent material of the cabinet and
to greatly reduce the cost.
4, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a conventional example, which is a
front perspective view of a speaker cabinet. FIGS. 2 and 3 show an embodiment in which the
present invention is applied to a speaker cabinet, FIG. 2 is a rear perspective view of a cabinet,
and FIG. 3 is a cross-sectional view of a mold used for manufacturing a cabinet It is a sectional
view. In the drawings used in the drawings, (21) is a cabinet, (a) is a ceiling plate, (good) is a
bottom plate, (good) is a side plate, (top) is a side plate, (2Q is a blank plate, In the mold, the side
of the inner W- sword is the outer mold 1, (the first) is the mixture liquid. Yuzo Izaka 〃 Tadahiro
Izaki End Page: 46, Ikuo (Spontaneous) Procedure Amendment for Other Inventors Mr. Ikuo
(Spontaneous) Procedure Amendment December 10, 1951 Hideo Saito, Director General of the
Patent Office 1, Case indication Showa 48th patent application No. 1 '13638 2, Title of invention
1 c cabinet 3 for device, correction applicant for correction person 8, contents of correction 1 or
more - EndPage: 5
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