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JPS55136790

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DESCRIPTION JPS55136790
A-Letter 1 Name of the Invention Horn Thermoplastic molding material for speakers or one of
thermosetting molding materials Add a foaming agent and a reinforcing material to a material,
density of material in throat and opening Differential mechanical internal loss characteristics A
molded reinforced plastic foam speaker horn that has been molded to provide a differential.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a speaker horn formed
of a material having a high loss property. As a speaker horn, conventionally, cast products of
aluminum alloy, wood products and plastic molded products are widely used. However,
aluminum alloy castings have low loss characteristics, and since the resonance point is usually
within the working band of the speaker, it is necessary to take measures to eliminate harmonic
distortion caused by the resonance. In addition, expensive casting molds are required for
production. Wood products have moderate loss properties, but they are not suitable for mass
production because they are not suitable for mass production, or they are easy to control within
a certain product lX range because they are based on natural materials Not In addition, plastic
molded products have large thickness deviation at each part, and air bubbles are generated
inside when thick parts are present, and density decreases due to insufficient water flow in thick
parts, shout mold Etc. In addition, a lack of rigidity occurs due to the inherent properties of the
material. The present invention provides a speaker horn having high rigidity, high loss property,
which is a required property, using a foamed plastic material to which a high elastic fiber, a
balloon and the like are added. The loss property and stiffness required in the construction of the
horn are mutually contradictory properties, and it is not easy to obtain a single material which
combines both. The present invention has high loss of wood and plastic, and by foaming the
plastic, it further increases the loss more than bulk plastic, and retention of rigidity lost in
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foaming is short cut EndPage: 1 (Chop-like) It is held by the addition of fibers or balloons. In
addition, a speaker horn is obtained by using a forming mold which is subjected to goething
suitable for forming a thick-walled uneven product. The speaker horn according to the present
invention may be made of a thermoplastic molding material such as polystyrene or polyvinyl
chloride or a belt or powder of a thermosetting molding material such as phenol or polyester,
and a decomposable foaming agent adapted to each molding material. In addition to this, an
appropriate amount of glass or shirasu balloon and glass fiber as reinforcements is added to
meet the intended purpose, and the materials are thoroughly stirred to prevent each material
from being unbalanced. It is obtained by injection molding. Hereinafter, the details will be
described by way of examples. Example 1 100 parts by weight of beret of polystyrene resin, 30
parts by weight of azobisformamide having a decomposition temperature of 150 to 180 ° C. in
the resin part is added to a degradable foaming agent adapted thereto, Add 50 parts by weight of
Shirasu balloon with an average diameter of 20 μm and 30 parts by weight of chopped glass
fibers of 5 to 10 mm in length: with a suitable mixer, in this case using a V-shaped blender there
is no segregation of the components of the husband and wife Mix well until evenly dispersed.
Then, the resin raw material obtained above was injection-molded into a molding die by an
ordinary in-line screw type injection molding machine to obtain a molded product shown in FIG.
Here, the gas generated by decomposition of the foaming agent is mixed with the molten resin
and flows to the tip of the horn opening, and is discharged from the mold gap 6 out of the
crucible or into the horn 1 After being clogged and the molded product being demolded, the
resin part is gradually permeated with the passage of time and the release continues until it is
equilibrated with the atmospheric pressure. The situation of the finished molded product and an
enlarged view of its partial cross section are shown in FIGS. 2 and 3, respectively. In FIGS. 1 to 3,
1 is a horn, 2 is a film gate, 3 is a sprue, 4 is a flood cutting groove, 5 is a flood, 6 is a mold gap,
7 is a balloon, 8 is a glass fiber, 911-1: A void, 10 is a resin skeleton. The mold is so configured
that the distance from the sprue differs between the thick horn throat of the molded product
obtained above and the thin horn opening side, and that a flood occurs intentionally at the tip of
the opening. As a result, a density difference occurs in the molded product, and the opening is
about 1/3 larger than the density 1.6 g / cm "of the throat. The phenomenon opposite to the
density still appears lossy, and that of the throat with respect to the loss factor of the opening 60
is about 40 and the loss is increased by about 1/3, as seen in FIGS. 4 and 5 Also, the flattening of
the sound pressure frequency characteristics when the horn is attached to the speaker
contributes to the reduction of harmonic distortion. Example 2 Io part by weight of a polyvinyl
chloride resin, 50 parts by weight of azobisisobutyro nitrile, 50 parts by weight of a shirasu
balloon having an average diameter of 25 μm, and glass fibers having a length of 5 to 10 mm in
the same manner as Example 1 After mixing, this was molded in the same manner as in Example
1 to obtain a horn. The density of the molded product obtained here was 1.82 g / cm in the
throat area, 2.25 l / tym in 1 opening, and the loss factor was in the throat 68 and the opening
45. In addition, when the vibration system using this horn in Example 1 was mounted and driven,
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the flatness of the sound pressure frequency characteristics and the harmonic distortion had
substantially the same effects as in Example 1. The same effects as in Example 1 can be obtained
with thermosetting molding materials such as polyester and phenol. As can be seen from the
comparison between FIG. 4 and FIG. 5, the harmonic distortion in the sound pressure frequency
characteristic is reduced to 1/2 to 1/3, and the characteristic can be improved. In addition, since
the injection molding can be performed, the mold cost and the molding cost remain unchanged,
and inexpensive and versatile materials can be used.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of an injection-molded
product of a speaker phon according to the present invention, FIG. 2 is a cross-sectional view of a
horn after completion of a surge, and FIG. FIG. 4 is a sound pressure frequency characteristic
diagram when using a conventional polystyrene solid horn, and FIG. 5 is a sound pressure
frequency characteristic diagram when EndPage: 2 using the horn according to the present
invention. 1: Horn 2: Film boot 3 Nispur 7: Noku Runo 8 niglass fiber 9: Hole 10: Resin
framework agent Patent attorney patent thin 1) Toshiyuki 1st district ζ 2 亭 3 fig. Perfusion
fluid number. ↑しEndPage: 3
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