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Description 1, title of the invention
Manufacturing method of acoustic diaphragm unit
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing an acoustic diaphragm unit used for an electroacoustic transducer using an
electret film or a polymeric piezoelectric film. An acoustic diaphragm unit of an electroacoustic
transducer using a general electret film or a polymeric piezoelectric film is constructed by
sticking the above-mentioned film 1 to a ring 2 as shown in FIG. In the conventional
manufacturing method of this acoustic diaphragm unit, as shown in FIGS. 2 and 3, a large
number of electrets or polymer piezoelectric films 4 are attached to the peripheral portion of the
upper surface of a cylindrical base 3 and fixed. The ring 6 was attached to the film 4 with an
adhesive. As this adhesive, an epoxy resin adhesive having good adhesive bond reliability was
used. Then, after the ring 6 is securely bonded to the film 4, the film 4 is cut along the outer
periphery of the ring 6 to obtain an acoustic diaphragm unit. In such a method, since the epoxy
resin adhesive is used for bonding, the curing time is longer than 2 hours, the productivity is
poor, and the property as the acoustic diaphragm is deteriorated due to the protrusion of the
adhesive. However, the tension of the film 4 has to be continued until the adhesive cures, which
causes the operation efficiency of the production facility to be poor, and thus has the
disadvantage of being disadvantageous in cost. EndPage: The present invention eliminates the
above-mentioned conventional drawbacks. An embodiment of the present invention will be
described below with reference to FIG. 7 is a frame-like base, and a film 8 such as an electret film
or a polymeric piezoelectric film is attached to the upper surface of the base 7 so that a large
number of weights 9 are attached to the peripheral edge to have a constant tension. There is. A
transparent ring 10 made of acrylic resin or glass is attached to the upper surface of the film 8
with an acrylic or epoxy UV curable adhesive, and these are housed in a container 11 for
blocking ultraviolet light. The film 8 and the ring 1o can be adhesively bonded in any short time
for 2 minutes at an irradiation distance of 20 cm by an ultraviolet lamp 12 such as a mercury
lamp of 100 V, 400 W provided inside. After that, the acoustic diaphragm unit is obtained by
cutting the film 8 from the container 11 along the periphery of the extraction ring 10, and the
wax ring 10 is made of a transparent body in order to facilitate the transmission of ultraviolet
light. . As described above, since the method of manufacturing the acoustic diaphragm unit
according to the present invention can be cured in a short time of 2 minutes by using the
ultraviolet curing adhesive, the productivity can be greatly improved, and the adhesive can be
used. There is little protrusion and stability in terms of characteristics can be measured, and the
operation efficiency of facilities such as bases and weights can also be increased, and it has the
advantage of being extremely advantageous in terms of production cost, and having high
industrial value. It is.
4. Brief description of the drawings. FIG. 1 is a perspective view showing a general acoustic
diaphragm unit, FIG. 2 is a top view showing one process of a method of manufacturing a
conventional acoustic diaphragm unit, and FIG. FIG. 4 is a cross-sectional view of one step
showing an embodiment of a method of manufacturing an acoustic diaphragm unit according to
the present invention. 7 · · · Base · 8 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 11 · · · container, 12 ·
ultraviolet light lamp. -Name of agent Attorney Nakao and 1 other EndPage: 2