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Brief description of the drawings
1 is a schematic structural view of a conventional airborne ultrasonic transducer, a is a top view,
b is a sectional view, FIG. 2 is a sectional view showing another conventional example, and FIG. 3
is a conventional cone FIG. 4 shows the directivity of an elliptical cone; FIG. FIG. 5 is a
perspective view of a horn used in the prior art, FIG. 6 is a view showing an embodiment
according to the present invention, where a is a plan view or a sectional view, and FIG. 7 is the
conventional structure shown in FIG. A is a top view, b is a cross-sectional view, FIG. 8 is an
example of a directivity characteristic view according to the present invention, a is a length
direction of a rectangular cross section, b shows the directivity in the width direction, and FIG. 9
is an example of a conventional directivity characteristic diagram, where a and b are directivity
characteristics in the direction of 90 ° apart from each other. 1; circular bimorph oscillator, 2;
support ring, 3 [deg.] 14 two reflectors, 7; conical resonator, 8; screen, 11; pyramidal resonator,
13; waveguide. Fig. 7 /
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