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-<2 ocio-1 Showa Tea / January 2 Patent Office Secretary 2, inventor 36 Patent applicant
representative body i White 1-(1-(1) specification 1 piece (2) drawing 1 Through (3) Power of
attorney-(-1--s through 特 開 昭 JP-A 49-67613 '-Request for examination not yet filed (all 2
pages) Specification 1, title of the invention
Loudspeaker manufacturing method
8. Detailed Description of the Invention The present invention relates to a method of molding a
diaphragm or damper for a speaker, and in particular, the present invention is characterized by
utilizing high frequency heating. Thermoplastic materials such as plastics The speaker diaphragm
or mineral damper to be used is manufactured using a mold. That is, the required shape of the
speaker diaphragm or damper is formed between the male mold and the female mold, and the
material which has been heated and softened is injected and pressurized and molded between the
molds. This method requires a long time for casting and is not suitable for mass production.
Further, there is a method in which the mold is heated, a sheet made of a diaphragm material or
a damper material is inserted between the molds, and pressure is applied by two molds. In this
case, if the diaphragm or wedge damper after molding is cooled and removed from the mold, the
shape retention property is poor, or high frequency heating is used at the time of molding
according to the social type of the present invention. It is a policy to remove one nine defects.
Another object of the present invention is to provide a method of manufacturing a speaker which
is extremely excellent in the handling of the ha-shaped sheet and the molded product of the
present invention. The drawings show the steps of the method of manufacturing a loudspeaker
according to the present invention. In the drawing, the mold and the mold B are formed with the
required shape of the speaker diaphragm or the damper on their respective joint surfaces. Either
mold or mold B, for example, mold is moved in its axial direction. The mold and B are connected
to poles of several tens of MIIIZ and several tens of kilowatts of electric drum 1s respectively.
Therefore, during manufacture, the iQj mold is moved to insert a sheet T made of a plastic-based
diaphragm material or damper material between the mold and EndPage: 1B. Then, the high
frequency power supply day is operated to heat the sea T) by high frequency. At this time, since
the distance in the “axial direction” of the mold formed by the molds A and B is uniform at any
part, the electric field is uniformly applied to the sheet TK inserted at right angles to the axial
direction of the mold ,) Si) T is uniformly heated because it is very thin compared to the
wavelength of the radio frequency electric field. Direct frequency heating butterfly sea)? Since
the high frequency power is consumed only, the efficiency is very high, and since the internal
heat of the sheet T is generated, the temperature rise of the sheet T is performed extremely
quickly. Sea) When the T is sufficiently heated, move the mold A gradually to press the stitch.
Also at this time, when pressurized to a high frequency and molded into a required shape, the
high frequency power source S is turned off, the gold ff1A is moved, and a) Tt-11R is pulled out
from between the molds A and B. Of course, Sea) T is molded to obtain a diaphragm or damper.
As described above, according to the present invention, since high frequency heating is used, the
temperature rise of C) T is extremely fast, and since it is heated from the inside of C) T, the
crucible heating time can be shortened, and pressure molding It is easy to carry out, the defective
product rate can be lowered and the pressure molding time can be shortened. Also, in the case of
inserting a heated sheet between molds as in the prior art, the time difference from taking out
the sheet to inserting it between the molds and the temperature of the sheet at the time of mold
& die by the ambient temperature Although this may change, in the present invention, since the
heating is performed during molding, the sheet temperature during molding can be kept exactly
constant and uniform molding is performed. In addition, since molds placed above and below the
sheet T serve as electrodes for low-frequency heating, standing waves are generated in a
direction perpendicular to the main surface of the sheet T, and a uniform electric field is applied
to the sheet. be able to. Furthermore, since the present invention uses high frequency heating,
there is almost no temperature rise of the mold itself, and the sheet is thin and the heat capacity
is small, so temperature 1 is sharply required even after special molding after pressure molding.
The temperature can be lowered to near room temperature, and the sheet can be taken out
immediately, and at this time, since the sheet temperature is lowered to near room temperature,
the shape retention of the molding can be sufficiently maintained. Moreover, since the
temperature of the mold does not rise, the sheet can be easily moved in and out, and the
handling is convenient.
4. Brief Description of the Drawings FIG. 1 and FIG. 2 are schematic cross sections showing each
step of an embodiment of a method of manufacturing a speaker according to the present
invention. Figure, A and B are molds, S is a frequency power supply, and T is a sheet. 2
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