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Brief description of the drawings
FIG. 1 is a plan view of a cone-shaped diaphragm showing the orientation of a reinforcing
material according to the conventional injection molding method, and FIGS. 2A and 2B are
explanatory views showing the mode of vibration in a resonant mode having concentric nodal
circles. 3A and 3B are explanatory views showing an aspect of vibration in a resonance mode
having radial nodes, FIG. 4 is a plan view showing an embodiment of a speaker diaphragm
according to the present invention, and FIG. 5 is FIG. It is sectional drawing which shows an
example of the metal mold by the injection molding method of the speaker diaphragm shown. In
the figure, 10 and 100 are speaker diaphragms, F2. F3 is the direction of orientation of the
reinforcing material, and L1 and L2 are nodes of resonance. In the drawings, the same reference
numerals denote the same or corresponding parts.