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FIELD OF THE INVENTION The present invention relates to a method of manufacturing a
loudspeaker diaphragm. Prior art Conventional polyester diaphragms are (heated) press molded.
Alternatively, although there is vacuum forming (heating), the material thickness of the cone
portion and the edge portion of the diaphragm is the same as the material thickness of the sheet
as it is. Therefore, f of the speaker (diaphragm). Permissible input, sound pressure, etc. could only
be dealt with by selection of suitable material thickness. Problems to be Solved by the Invention
According to the conventional method, fo, allowable input, sound pressure and the like have
already been determined by the thickness of the sheet material, for example, f of the speaker. If
you try to lower the sheet material thickness can only be lowered, in this case f desired. However,
although the cone surface strength became weak, the allowable input (power) could not be
maintained due to the increase of the bevel and distortion of the cone surface. In the case of the
molded product of the conventional method, the cone portion and the edge portion are made of
the same material and the same material thickness, so the vibration system's rigidity is poor and
its cone surface is sharper than the vicinity of its saturation saturation point. A sound crack
phenomenon occurred. The present invention is intended to provide a manufacturing method
that can solve these problems. Means for Solving the Problems The present invention is to obtain
a cone having a thin edge portion and a thick cone portion by fixing and heating the periphery of
the sheet in the sheet heating step of the cone forming process. Lowering the conventional f by
partially improving the mold in the action heating process. It is possible to realize a diaphragm
that has both high input resistance and high input resistance. EXAMPLES Examples of the
present invention will be described with reference to the drawings. FIG. 1 is a plan view showing
a heat treatment step, and FIG. 2 is a sectional view of the same. In FIG. 1 and FIG. 2, 1 is a rollshaped sheet, 2a and 2b are sheet fasteners, and the sheet fastener 2a is fixed to the fixing
portion 4 vertically movably by a spring 3. ?????????? First, as shown in FIG. 1 and
FIG. 2, the spring 3 is used around the sheet heating process, and the fixing tool 2 fixes or semifixes the sheet 1 around. Then, the sheet 1 is heated by the heater 5. Here, a fixing force (variable
by a spring pressure) around the seat and an arbitrary f depending on heating temperature and
time. Is obtained. Effect of the Invention According to the invention f. The sound quality
requirement for lowering the sound quality is reduced, and the poorness of the linearity inherent
to the film diaphragm can be improved.
Brief description of the drawings
FIG. 1 is a plan view for explaining the present invention, and FIG. 2 is a cross-sectional view of
1 ииииииииииииииииииииииииииииииииииииииииииииииииииииии Heaters.
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