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FIELD OF THE INVENTION This invention relates to flat diaphragms. 2. Prior Art As shown in FIG.
2, as a conventional example, a flat plate diaphragm is constructed by attaching an aluminum foil
2.3 to the upper and lower surfaces of a honeycomb core 1 and providing an edge 4 at the
peripheral edge. Problems to be solved by the invention However, the strength of the outer
peripheral portion of the diaphragm is weak, and external pressure is applied to the outer
peripheral portion during the process of manufacturing the diaphragm, during transportation,
and in the speaker assembly process, causing appearance deformation. There was a drawback.
The present invention seeks to provide a loudspeaker which can solve the above-mentioned
drawbacks. Means for Solving the Problems The flat diaphragm of the present invention is one in
which the peripheral portion of the core is crushed. Operation With this configuration,
deformation due to external pressure can be prevented. EXAMPLE FIG. 1 shows a cross-sectional
view of a flat plate diaphragm according to an embodiment of the present invention. In the
figure, 5 is a honeycomb core made of vapor, 6 is a skin on aluminum, 7 is a skin on aluminum, 8
is a skin It is a free edge. As the present embodiment, in the process of bonding the core 6 and
the upper and lower skin members 6.7 by heating and pressure bonding, the corners of the four
corners of the outer periphery of the diaphragm are crushed by a pressure press, and an R shape
as illustrated. Molding. According to this configuration, it is possible to prevent the corner from
being deformed and deformation due to external pressure or the like.
Brief description of the drawings
FIG. 1 is a cross-sectional view of the flat diaphragm of this embodiment, and FIG. 2 is a crosssectional view of a conventional flat diaphragm.
5 ииииии Core, 6 ииииии Top skin, 7 ииииии Bottom skin. 8 ..... free edge attorney's name patent attorney in
the tail Satoshi man and one other person S- core first Figure 8 - one free er 7 's second Figure
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