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Horns of beaker horns are generally made by casting metal, but all of them have high rigidity but
low imitation loss, so when used as a speaker in a system, 1-'rai / \- The horn vibrates in
resonance with the vibration of the sound and other sound sources, and there is a drawback that
the unwanted unpleasant sound is emitted from the horn and the reproduction sound quality is
impaired. In order to eliminate this drawback, the damping rod is used as a word in the first sun,
but the effect is not sufficient, and the appearance of size is impaired. In another 1111
construction, plastic mixed with filling 4A is injection molded, or wood and L-no horn are also
present, but the strength is not sufficient when the size becomes large from 41 Pa q of the weld
line In the case of the extravagant wooden case, it has the disadvantage of being expensive 1)
The speaker horn of the present invention is described in detail in the embodiment as follows. On
the polymer sheet 1-1 '' clamping: ff1ll IQ about 1ll IQ glass fiber 2 loaded fE? Then, move the
glass fibers 2 in the random by 4 directions in the circle direction, and stack several sheets of
this, as shown in Fig. 1, heat at 130 ° to 150 ° () by the far infrared heater 3 Then, by ramioforming through a roll bar 4.4'-C, composite sheet 1-5 having a thickness of about 3 mm, in
which the galanu fiber 2 is embedded in polypropylene 1, is obtained. Furthermore, after cutting
this composite sheet 5 and stacking a plurality of thick parts and heating it to about 220 ° C. to
230 ° C. for 71 rl with a far-infrared heater, it is heated with a room temperature mold 6.7 (in
this case If necessary, insert the insert nut for mounting into the mold at the desired location and
press it with a pressure knob of about 120 Ky / cl +. Ru. Facing, after cooling and solidifying in a
mold for about 30 seconds, it is released and subjected to finish shaping to obtain an uneven
thick speaker horn. Since the speaker horn obtained in this manner can be applied with a
pressing nump step, a long fiber can be used, and there is an advantage that the anupect ratio
becomes large. The horn of the present invention may be manufactured by dividing the horn into
two as illustrated in FIG. 2, and then bonding may be performed, or may be integrally molded if
possible. Further, as shown in FIG. 3 as an example, if the reinforcing ridge 8 is used in
combination with the horn portion 9 divided into two, bonding of the reinforcing ridge 8 will
result in a horn of higher rigidity, and for a large horn speaker) 1) Appropriate 7 The physical
properties of are higher in Young's modulus than in the injection molding process 1 table as
shown in Table 1 and 1. in comparison with the amount of metal. , An n δ, that is, the vibration
suppression force is large.
The weld line, which is a defect of the injection molding process, is not used now, and the quality
instability due to the strength reduction is eliminated. In the speaker horn of the present
invention, the long fiber glass mat is impregnated with polypropylene, and further, since it is a
composite layered structure with polypropylene, the vibration loss is large, and the rigidity is
high, and the complicated curved surface shape is formed easily and easily. Since the horn
vibration level is extremely low compared to the horn made of metal material and the resonance
is not sharp as it has the characteristic that it can be obtained, it is desirable to obtain a good
horn horn beaker of reproduced sound without unwanted sound pressure radiation due to horn
vibration. It is possible to
Brief description of the drawings
FIG. 1 is a production explanatory view of a nubeaker horn component according to the present
invention, FIG. 2 is an explanatory view of a production method of the horn, and FIG. 3 is an
exploded perspective view of another embodiment.
1 is polypropylene or a copolymer sheet thereof, 2 is a glass plate, 5 is a composite sheet, 8 is a
reinforcing frame, and 9.9 is a horn member.
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