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JPS5077032

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DESCRIPTION JPS5077032
Chief of Patent Office (3 or more) Patent applicant address Marunouchi, Chiyoda-ku, TokyoChome No. 5 No. 1 Hitachi, Ltd.-Production site 2 [Phase]-Japan Patent Office-JP 59-770320
published Nissho 500. (1975) 6.24 Japanese Patent Application No. 43-// 'l'72 In the Office,
Reference No. 5' SS Name of the Invention of the Invention In the speaker cabinet baffle plate
outer layer and inner layer and these two layers A baffle plate for a speaker cabinet, comprising:
an interposed intermediate layer, wherein the outer layer and the inner layer are formed of a
mixture of mineral fragments and a synthetic resin, and the intermediate layer is formed of a soft
synthetic resin.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a baffle plate of a
speaker system used for a radio receiver, stereo battery storage and the like. In a speaker system,
pressure may act on the cabinet due to the sound of the speaker, and the cabinet may vibrate at a
natural frequency. The vibration of the cabinet is undesirable because it causes peaks and valleys
in the frequency characteristics of the acoustic signal reproduced from the speaker. Loudspeaker
cabinets are mainly made of wood particle board etc. so many cases are taken. For this reason,
the thickness of the plate is thickened or a reinforcing material is attached to the back of the
plate to prevent vibration. However, in this speaker cabinet, the baffle plate for mounting the
speaker is limited because the thickness of the plate can be thickened for the convenience of
mounting the speaker, and the sound emission hole of the speaker is provided at the center of
the baffle plate. It is difficult to prevent the vibration of the baffle plate because the material is
not effectively attached. Also, the frequency of the vibration applied from the outside; the baffle
plate resonates and vibrates when it matches the natural vibration frequency of the baffle plate,
but the sharpness Q of this resonance is large. Not desirable. The present invention is to obtain a
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baffle plate of a speaker cabinet with less vibration. An embodiment of the baffle plate according
to the present invention will be described below with reference to the drawings. FIG. 1 is a front
view showing an embodiment of the baffle 1 and plate according to the present invention, and
FIG. 2 is a cross-sectional view thereof. The sound output hole 3 of the speaker is opened, and a
plurality of screw holes 4 and 5 for mounting the speaker are provided around the two sound
output holes 2 and 3. The screw holes 4 and 5 are respectively pierced through the buckle plate
1. Further, a plurality of mounting holes 6 for fixing the baffle plate l to the speaker cabinet are
provided near the periphery of the baffle plate l. The baffle plate 1 has an i structure having an
outer layer 7, an inner layer 8 and an intermediate layer 9 sandwiched between the two layers as
shown in FIG. 2. The outer layer 7 and the inner layer 8 are limestone, glass, The intermediate
layer is formed of a soft synthetic resin, and is formed of a mixture of mineral powder such as
metal, fine particles, fragments and the like and a synthetic resin such as polyester resin. And
such a buckle board can be obtained as follows. Low shrinkage non-conforming polyester resin иии
940 g limestone powder ииииииииииииииииииииииииииии IIIII + 1.4-limestone fine particles, particle size 0.6 to 0.8
?s и 11 и- 1kg limestone granules, the particle size 0.8~l, Omm ииииии, ии 1kg methyl ethyl ketone
peroxide -55q6 solution sss * s * a ** i + e * 5essaeaJ4g cobalt naphthenate (6 inch) m ** a * maa
* 5g As the above-mentioned low-shrinkage non-smooth poly-chi resin-For example, Nippon Cata
Chemical Industry Co., Ltd. product Epolux AT-100 ░ -L grinding system and mixture of
Epostocks 13 Pc are used.
Add 3 types of limestone and mix them so that different particle sizes are well mixed. Also, two
types of polyester polyester resins are mixed well, cobalt naphthenate is added as an accelerator,
mixed well, and methyl ethyl ketone oxide as a catalyst is added and mixed well. Next, the above
limestone is added to this polyester resin and mixed well to obtain a mixture of limestone 1.1 and
a polyester resin. Next, a flat frame is formed, and a disk corresponding to the sound emission
hole of the speaker is fixed at a predetermined position in the inside of the frame, and the
mixture is held in a thickness of 8 by holding the frame horizontally. Inject in order. Leave it at
room temperature for about 2 o'clock to cure it. ? Next, as a middle layer, soft non-tL-added
polyester resin ah'y-p, ee @ II 14 '' 9 cobalt naphthenate (6 thi), m m ++ * see * 5 g methyl ethyl
ketone perox l 'id' '? 155 thie solution *** * Ea ** eee-ee ++ *, ++ slog For example, Ligoluck
'i'OFi, a product of Showa Highpolymer Co., Ltd., is used as a soft non-dilute polyester resin.
Cobalt naphthenate is added to and mixed with this soft polyester resin, and methyl ethyl ketone
peroxide is then added and mixed well to obtain a soft, disorganized polyester resin solution. The
soft polyester resin is poured onto the mixture of limestone and polyester resin poured into the
mold so as to have a thickness of 34 WLrn. Then, the resin is cured at room temperature, and
after curing, the rest of the polyester resin and limestone old material is poured so as to have a
thickness of 8 and allowed to stand at room temperature for 2 hours for curing. It is then allowed
to cure completely for one to two hours in 600 atmospheres. After curing-When removed from
the mold frame, the outer layer and the inner layer are formed of a mixture of limestone and a
polyester resin and the intermediate layer is formed of a soft polyester resin, and the thickness of
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the outer layer and the inner layer is 811 Is. A buckle plate with a thickness of 4 and a height of
54 cym, a width of 30 cm and a weight of 1? can be obtained. The buckle plate thus obtained
has the speaker mounting holes 4 and 5 and the baffle plate number holes 6 near the periphery
of the sound output holes 2 and 3 and the periphery of the pan plate 1 as shown in FIG. 1 and
FIG. Light with a drill. And, as shown in FIG. 3, medium-high-tone spike power lO and low-pitched
bass-bi force 1. Attach L with screws 12 and attach the baffle plate to the speaker cabinet 13
made of wood or the like. In order to attach the buckle plate 1 to the cabinet 13, ? 14 ? fc is
fixed to the inside of the cabinet 13), and it is fixed to the hole 6 made in the buckle plate 1
through ? 1 now 01 ? ? ииии 4C Then, the baffle plate l is formed of a composite resin
containing a fragment of a mineral such as a three-layer structure 4 'and a baffle plate 1 a threelayer structure 4'. There are 7), 'e', vibration due to the sound pressure of the speaker, not / and
further, the soft synthetic resin is placed on the outer layer 7 and the inner surface 1s: I], and the
sharpness of the resonance of the buckle plate Q can be reduced and vibration can be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS 5-EndPage: 2 FIG. 1 is a front view of a baffle plate to
be uninvented, FIG. 2 is a sectional view thereof, and FIG. 3 is a buffer plate to be uninvented
attached to a speaker cabinet FIG. 6 is a cross-sectional view showing a broken state. 1 is a baffle
plate, 2 and 3 are sound emission holes, 4 and 5 are speaker mounting holes, 6 is a baffle plate
mounting hole, and ? is an outer layer, 8! 'I inner layer, 9 is an intermediate layer. Agent Patent
Attorneys 1) Toshiyuki 1 ? Fig. 2 Fig. 3 ? / J,-List of attached documents (1) Akira Akira 1 fill
book (2) Drawing 1ii 11 (3) Letter of attorney 1 (4) 1) ? ?Deputy Applicants 1 Other Inventors,
Patent Applicants or Agents Inventors Name of President Kito Prize Patent Applicant Address
105, Yurakucho, Chiyoda-ku, Tokyo Name (434) Nippon Oil Co., Ltd. Representative Village 1)
Tsutomu address Notification of change July 31, 1959 Patent Director General Hideo Saito,
display case of Japanese patent application No. 4 A4? -No. / Tsuku y2. Name of Invention 2
Name of Invention 2 Name of Invention 3 Relationship with the Case Patent Applicant Old
Address 1st Street, Yurakucho, Chiyoda-ku, Tokyo New Address ? 100 ? Chiyoda, Tokyo Ward
Yurakucho 1-chome 70 @ / issue (4t3 Da) Japan-Resin Corporation representative village 1) ?
? <<, (), EndPage: ?
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