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JPH02274100

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH02274100
[0001]
[Industrial field of application] This invention is a speaker in which a diaphragm portion and a
voice coil bobbin portion are deposited in series on the surface by plasma spraying B4C, At2o3
or SIC or the like in a mold. The present invention relates to a method of manufacturing a
diaphragm for use in the present invention. [Prior Art] FIG. 4 is a vertical sectional view showing
a conventional dome-shaped speaker unit, as shown in FIG. (5) is a voice coil wound around the
voice coil bobbin portion of the diaphragm, (6) is a pole piece, (71 is a magnet fixed on the pole
piece, (81 is a play provided on the magnet) (91 is a spider that supports the moving plate (11),
Ql is a frame that fixes the spider (91), (11) a foil that protects the diaphragm (1). ントヵバーで
ある。 FIG. 5 is a cross-sectional view of a mold showing the conventional method for forming
the diaphragm (11! (1a) is a conventional diaphragm portion formed by plasma spraying ceramic
or the like and deposited on the top surface of the convex portion (2a) of the mold (2); (ib) is a
series of voice coil bobbins and this (3) is a plasma spraying machine. FIG. 6 is a cross-sectional
view of the diaphragm released from the mold (2), and FIG. 7 is a diaphragm showing a state
where the voice coil (5) is wound on the voice coil bobbin portion (1b) of this diaphragm. In
these sectional views, reference numeral (4a) in the drawings is a projection by sprayed particles
such as ceramic formed on the surface of the diaphragm. As described above, in the conventional
manufacturing method, projections (4a) of sprayed particles made of ceramic or the like are
present on the surface of the diaphragm, and the voice coil (5) is wound thereon. [Problems to be
Solved by the Invention] As described above, the conventional voice coil (5) is unstable because it
is wound on the projections (4a) of the thermal spray particles made of ceramic etc. The heights
of the respective parts after the winding are not uniform either, and the projections (4a) of the
sprayed particles appear on the surface of the diaphragm, which causes a problem in
appearance. The present invention aims to solve the above-mentioned problems. [Means for
Solving the Problems] In the manufacturing method of the present invention, plasma spraying is
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performed on the inner surface of a recess (2b) of a predetermined shape formed on a mold (2)
and having a smooth surface B4C! , At 205 or a voice coil bobbin portion (1b) made of SiC or the
like, and a diaphragm portion (1a) are deposited and formed in series [Operation] According to
the manufacturing method of the present invention, the above-mentioned material by plasma
spraying The projections of the sprayed particles appear on the back of the diaphragm and voice
coil bobbin.
The surface is smoothed by mold release. An embodiment of the present invention will be
described below. That is, (1a) and (1b) in FIG. 1 are B40 formed by plasma spraying on the inner
surface of a recess (2b) of a predetermined shape formed on a mold (2) and having a smooth
surface. The diaphragm portion and voice coil bobbin portion made of At203 or 1310 or the like,
and (3) is a plasma spray machine. FIG. 2 is a cross-sectional view of the diaphragm according to
the present invention after mold release. The projections (4a) by the sprayed particles made of
the above-mentioned material appear on the back of the diaphragm (1a) and the voice coil
bobbin (1b). ing. FIG. 3 is a cross-sectional view showing a state of winding to the diaphragm, and
the voice coil (5) is wound on the surface smooth surface of the voice coil bobbin portion (1b).
The surface of the top diaphragm portion (1a) of the diaphragm released from the mold (2) and
the surface of the voice coil bobbin portion (1b) are both smooth as described above. There is no
problem in appearance, and since the voice coil (5) is wound on the surface smooth surface of
the voice coil bobbin portion (1b), the heights of the respective portions after 2 turns of the
winding are also uniform. Although the method of manufacturing the dome-shaped diaphragm
has been described in the above embodiment, the present invention may be applied to the
manufacture of a cone-shaped diaphragm. The vibrating plate released from the mold and the
mold may be further subjected to a baking treatment, or a resin impregnation treatment may be
additionally performed. [Advantage of the Invention] Since the speaker diaphragm of the present
invention is manufactured by the above method, projections due to sprayed particles of the
material due to plasma may appear on the surface of the diaphragm portion and the surface of
the voice coil bobbin portion Therefore, it has an effect that there is no problem in appearance
and that the above-mentioned inconveniences do not occur in the winding operation of the voice
coil and the state after the winding.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an embodiment of a method for manufacturing a speaker
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diaphragm of the present invention, FIG. 2 is a cross-sectional view of a speaker diaphragm
manufactured by the method of the present invention, and FIG. FIG. 4 is a vertical cross-sectional
view showing a conventional dome-shaped speaker unit, FIG. 5 is a cross-sectional view showing
a conventional method for manufacturing a diaphragm for a speaker, and FIG. FIG. 7 is a crosssectional view of a diaphragm showing a state after releasing the mold, and FIG. 7 is a crosssectional view showing a state in which a voice coil is wound around this.
In the figure, (1a) is a diaphragm portion, (Ib) is a voice coil bobbin portion, (2) is a mold, and
(2b) is a recess.
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