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JPS4842171

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DESCRIPTION JPS4842171
■ Method of manufacturing a speaker diaphragm ■ Japanese Patent Application No. 44-99077
[Phase] Application No. 44 (1969) December 11 @ inventor Mayu Hiroaki Kohamamatsu city
Nakazawa-cho 50 50 applicant Nippon Musical Instruments Manufacturing Co., Ltd. Hamamatsucity Nakazawa-cho 1 o 1 [phase] agent patent attorney Ryose Yoichi 1 person
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a diaphragm having a
lead wire lead-out portion according to the present invention. FIG. 2 is a perspective view
showing a lead wire fixing member and a lead wire used in the present invention. FIG. 3 is a
cross-sectional view showing a molding die and a molding method of the lead wire lead-out
portion.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement
in a method of producing a lead wire lead portion in producing a diaphragm of foamed plastic
such as foamed polystyrene in a speaker. Conventionally, in a single speaker using a diaphragm
made of foamed plastic such as expanded polystyrene, the lead wire of the voice coil is attached
to the back side of the diaphragm and quoted to a predetermined position. As a method of
improving the method of drawing out such lead wires and attaching the lead wires together to
the diaphragm at the time of molding the diaphragm, there is a method of integrally molding the
diaphragm, the voice coil, the peripheral material of the lead wire 1 and the like. It was invented
earlier. しかし。 In such a molding method, the mechanism for molding is complicated and
molding is difficult. −! た。 In the molded diaphragm, since the part where the lead wire is
separated is fixed with an adhesive or the like, it is lacking in flexibility and resistance to
vibration. In addition, there is a drawback that the adhesive is solidified on the part and the
release becomes difficult. In the present invention, in forming the diaphragm and the lead wire
together in this way, the method of drawing out the lead wire is improved [111111], and the lead
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wire can be provided on the diaphragm in an extremely simple operation. Another object of the
present invention is to provide a method of manufacturing a speaker diaphragm, which is easy
and provides a diaphragm having a flexible portion where the lead wire is separated from the
diaphragm and sufficient resistance to the vibration of the diaphragm. According to the method
of the present invention, the lead wire is first passed through a lead wire fixing member made of
a rubbery elastic material. This is applied to the lead wire lead-out portion of the die for forming
a diaphragm, one end of the lead wire is drawn out through the lead wire lead-out hole of the die,
and then the die is filled with the diaphragm forming material and heated and molded It is a
feature. The following describes one drawing. FIG. 1 shows a cross section of a molded
diaphragm. In FIG. 1, 1 is a foamed plastic diaphragm, 2 is a voice coil bobbin, 3 is a voice coil, 4
is a lead wire made of a tinsel wire, and 5 is a rubber-like elastic body The inner end of the lead
wire 4 is soldered to the voice coil by the portion 6. The lead wire 4 and the lead wire fixing
member 5 are configured in advance so that the lead wire extends approximately through the
center of the fixing member as shown in FIG. Insert the (by being molded. FIG. 3 shows a
diaphragm mold, and in FIG. 3, 7 is a lower mold, 8 is an upper mold, 9 is a lead wire extractor
L10 provided on the lower mold, and a fixing member receiving recess is shown. In the method
according to the present invention, first, the lead wire 4 is passed through the lead wire fixing
member as shown in FIG.
This is fitted into the fixing member receiving recess 10 of the lower mold 7 of the molding die,
and one end of the lead wire 4 is drawn out through the lead wire lead-out hole 9. Load it on the
top and fit the upper mold. Heat molding. As a result, the lead wire and the diaphragm are
molded together, and the lead-out portion of the lead wire is firmly fixed by the fixing member of
the elastic material. As described above, the method according to the present invention can be
molded with a mold having a very simple structure with only a [111111] EndPage: 1 piece
provided with a fixing member receiving recess and a lead wire extraction hole in the lower mold,
and thus made Easy and easy to mold with raw hair. However, since the lead-out portion of the
lead wire is fixed by the fixing member of the elastic material, it is possible to obtain a diaphragm
which is strong and flexible against vibration and has no fear of disconnection. Further, since the
lead wire lead-out hole is provided in the lead wire lead-out portion of the mold, if this hole is not
closed, the molding material or the liquid adhesive will leak during molding, making mold release
difficult. Alternatively, there is a possibility that the lead wire may be hardened and the durability
may be reduced. In one method of the present invention, the fixing member of the rubber-like
elastic material is fitted in the receiving recess at the time of molding to complete the lead wire
extraction hole The mold material does not leak out during molding (the simple structure
completely shields the inside and outside of the mold). Moreover, there is no problem in terms of
mold release.
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