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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view for explaining the vibration mode
6 in a rectangular diaphragm, and FIGS. 2 to 4 are embodiments of a diaphragm for a flat panel
speaker according to a plan according to the present invention. 7 is a sectional view, FIG. 3 is an
exploded perspective view, and FIG. 4 is an exploded perspective view showing another
configuration example. A ... diaphragm, 1 ... core material, 2, 3 ... outer layer material, 4 ° 5 ...
surface material, 6 ... core material, 7, 8 ... fibers.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a
flat panel loudspeaker, in particular to a diaphragm having a rectangular shape. In general, the
vibration mode of the peripheral supporting diaphragm having a rectangular shape as shown in
FIG. 1 is given by the following equation. °−″パご、+;1. Layered staples, 7 where Wangular frequency (raφ) 2h = thick plate country) a = length of side a 5 +) ;,))-"4"-! l ≠ de 2b =
length of side n n-number of joints parallel to side a m = side of parallel force tube number E =
longitudinal elastic modulus (4 lines) double force acceleration (980 cay's ♂ ) Α = Poisson's
ratio γ-Specific weight (V-) of the plate. As shown in FIG. 1, in the case of the length of side a) b,
the first mode to occur is the mode parallel to the side. This is the case for diaphragms that use
physically (strongly) non-directional materials. Therefore, in the present invention, it is desirable
to provide a rectangular diaphragm in which the diaphragm having a rectangular shape is
formed into a sandwich structure and the strength on the long side is increased to increase the
division frequency (the frequency at which the mode occurs). To aim. An embodiment of the
present invention will be described below with reference to FIGS. 2 to 4. In the figure, 1 is a core
material, 2 is one outer layer material, 2,. Reference numeral 3 denotes the other outer layer
material, which constitutes a rectangular diaphragm A of a sandwich structure. The outer layer
material 2.3 is a sandwich structure in the example of FIG. 3, and the surface layer material 5 and the core material 6 are both made of unidirectional pre-brag formed plate (CFRP
collection). There is. And, as the surface layer materials 4 and 5, those in which the fibers are
aligned in the longitudinal direction are used, and those in which the core material 6 is aligned in
the short direction are used. By doing so, the strength of the outer layer material 2.3 is greater
on the long side than on the short side. Fig. 4 shows another configuration example of the outer
layer material 2.3. The outer layer material has a satin weave shape, and the number of fibers is
different in FRP etc., and the length direction is longer than the number of fibers 7 in the short
side direction. The number of fibers 8 is increased. According to the diaphragm for flat panel
speaker of the present invention, the strength on the longitudinal direction side can be enhanced
to increase the division frequency, and the configuration is also simple, and it is optimal as this
kind of rectangular diaphragm. is there.
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