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JPS5575397

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DESCRIPTION JPS5575397
1 no '°-specification 1 title of the invention
Manufacturing method of diaphragm for speaker
13. The present invention is a diaphragm for a speaker manufactured by thermocompression
bonding a flexible resin foam to a base cloth, wherein the rigid ring is thermocompressionbonded to the peripheral portion of the diaphragm at the time of the above thermocompression
bonding and deformed The present invention relates to a method for producing a speaker
diaphragm which is designed to prevent the Recently, a flexible sheet is bonded to the base fabric
to eliminate resonance near the high limit frequency and no peak is generated in the sound
pressure frequency characteristics, as shown in FIG. There is a base cloth 1 made by thermocompression bonding of a resin foam 2 such as urethane or maltobrene which is rich in
flexibility. However, when it is released from a molding die after molding, the edge portion is
largely deformed to cause slivers In this state, cutting into a predetermined shape, incorporating
a voice coil, or making it extremely difficult to incorporate as a subwoofer is also a Q. Because of
this, after mold release, rings 3 and 4 made of metal or nonmetal rigid body are attached to the
edge with adhesive or adhesive tape, but bonding of diaphragm and rings 3 and 4 is sufficient
When the speaker is used as a speaker, there is a drawback that the ring 3.4 and the diaphragm
can not be bonded in the same I% i-circle shape and become eccentric. The present invention
eliminates the above-mentioned conventional drawbacks. An embodiment of the present
invention will be described below with reference to FIGS. 3 and 4 of the drawings. First, as shown
in FIG. 3, AlEndPage: 13 /-is placed in the lower mold 6, and a flexible resin foam 7 such as
maltobrene or urethane is placed thereon, and this resin foam γ A base fabric 8 in which a resin
such as phenol is impregnated in a silk cloth or a cotton cloth is placed on top, and this is heated
and pressed by the above-mentioned lower mold 6 and upper mold 9 heated to a temperature of
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220 to b ' The rigid ring 6 and the resin foam 7, the resin foam 7 and the base fabric 8 are
thermocompression-bonded to form an integral part, which is released and cut into a
predetermined shape to obtain a dome-shaped speaker as shown in FIG. I have obtained a
diaphragm for. According to such a method, the mold release operation from the molding die is
facilitated, and the shape of the edge portion is not deformed at the time of mold release. This
facilitates the process of incorporating the diaphragm as a speaker. In addition, since the rigid
ring is positioned in the molding die, the diaphragm and the rigid ring are eccentric. If it is
incorporated as a speaker, it will be anomalous due to gap grinding of the voice coil. If the shaft
is C06. Furthermore, the rigid ring simultaneously with the thermocompression bonding of resin
foam and base cloth. Since the thermocompression bonding is performed by heat and pressure,
the bonding is also uniform and reliable, and the generation of a chatter can be eliminated.
As described above, according to the method for manufacturing a speaker diaphragm of the
present invention, it has various advantages and is a dog of industrial value.
4. Brief description of the drawings. FIG. 1 is a half sectional view showing a conventional
speaker diaphragm, FIG. 2 is a half sectional view of a rigid ring attached to the edge of the
diaphragm, and FIG. FIG. 44 is a half sectional view of a speaker diaphragm manufactured
according to the same method in a step of an embodiment of a method for manufacturing a
speaker blade of the invention. 5.9 ····· Mold die, 6 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · resin foam, 8 ·
· · · · · · · base fabric. ,-Name of the agent-Toshio Nakao and others 1 person 淋 Figure 1 Figure 2
Figure 3 EndPage: 2
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