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1 Word 1 Detail Document 1, Title of Invention,-
Manufacturing method of diaphragm for speaker
The present invention relates to a method of manufacturing a diaphragm for a speaker in which
a fan-shaped metal foil is formed into a cone shape and joined to a seamed portion, and this is
formed by a forming apparatus. This is an IJ method that provides a method that can be
accurately formed even with the diaphragm of the above. As a manufacturing method of the
diaphragm for speakers using the conventional metal foil, as shown in FIG. 1, aluminum is used.
A metal foil 1 such as titanium is punched into a disc shape, and the clamper 7 which is always
urged downward by a 2 иии bung 6 is moved downward to make the periphery of the metal foil 1 a
clamp bark and a lower mold 3 And the upper die 5 is pressed against the metal foil 1 for
forming. Since this method can not cover more than the elongation rate of the material, only
diaphragms with shallow diaphragms can be obtained. For example, the elongation of aluminum
was 28%, and it was not possible to squeeze deeply, and only a shallow diaphragm was obtained
?). From this point of view, the production method of seamed diaphragms is also being studied,
but it is necessary to use upper and lower molds when molding uprising parts etc. for joining
voice coils. There is a drawback that high precision is required and it becomes expensive and it is
difficult to obtain a diaphragm without deformation. The present invention eliminates the abovementioned conventional drawbacks. An embodiment of the present invention will be described
below with reference to FIGS. First, as shown in FIG. 2, a metal foil 8 such as aluminum or chiEndPage: 13-basin is punched into a fan shape, and this is rounded as shown in FIG. 3 to form a
cone shape. Bonding is carried out by any of welding, soldering and bonding, and this is formed
by the forming apparatus shown in FIG. This molding apparatus is provided with a cylindrical
lower die guide 11 on a base plate 1o, and a lower die 14 made of metal having a conical
molding recess 13 on the upper surface in the lower die guide 11 via a spring 12; Hard urethane,
acrylic, neoprene having on its lower surface a conically shaped convexity 15 which coincides
with the concave shape 13 of the mold 14. And the above-mentioned cone-shaped one is
centered on the lower mold 14 and the metal mold 8 is moved downward to place the metal foil
8 in the molding recess 13 of the lower mold 14 The rising portion 17 for voice coil bonding and
the edge attaching portion 18 at the peripheral portion are fixed by pressing using the elasticity
of 16 and formed to obtain the speaker diaphragm 19 shown in FIG. The hard rubber of the
upper mold 16 is most preferably 80-1 oO in rubber hardness. As described above, since the
upper mold is made of rubber material and seamed by a molding apparatus using the lower mold
as a mold and then molded, the set metal foil is determined and pressed by the elastic force of
the upper mold The molding conforming to the molding shape of the lower mold can be carried
out, and even complex shapes can be sufficiently molded.
Moreover, since the fan-shaped metal foil is rolled and seamed, a deep-shaped diaphragm can be
freely obtained. As described above, the method for manufacturing the speaker diaphragm of the
present invention has many advantages and is a high industrial value.
4. Brief description of the drawings. FIG. 1 is a half sectional view of one step of a method of
manufacturing a conventional speaker diaphragm, and FIG. 2 is a metal foil in one embodiment
of a method of manufacturing a speaker diaphragm of the present invention. 3 is a perspective
view of the metal foil in a cone shape, FIG. 4 is a half sectional view of the molding apparatus,
and FIG. 4 is a speaker obtained by the method. It is a perspective view of the diaphragm for
diaphragms. 5 "Pa 8 ...... metal foil, 9 ...... seamed portion, 10 ... ... base plate, 11 ... ... lower die
guides, 12 ..... и и и и и и и и и 13 и и и и и molding recess, 14 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и upper mold, 1 '' r и и и ............. Name of agent Attorney Nakao et al. 1 person Fig. 1
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