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Brief description of the drawings
FIG. 1 is an external view of a cylindrical piezoelectric electron according to the prior art, FIG. 2
is an external view of a barrel receiver according to the present invention, and FIG. 3 is a
sectional view showing a barrel receiver opening angle of 30 ░ according to the present
invention. Fig. 4 is a cross-sectional view showing a barrel-shaped receiver opening angle 70.5 ░
according to the present invention, and Fig. 5 is a vertical directivity of a cylindrical piezoelectric
and barrel-shaped piezoelectric at 200 kHz (aperture angle of 30 ░). 6 is a circle graph showing
the directivity of 200 kHz, 300 kHz, 350 kHz, and 400 kHz at an aperture angle of 30 ░ of a
barrel-shaped piezoelectric according to the present invention. 5 иии Barrel-shaped piezoelectric
body, 6 иии и и и Plate-shaped support for supporting stationary piezoelectric body, и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и Fixing agent for fixing the support, 9 и и и и и и Void inside stationary piezoelectric, 10
и и и stationary piezoelectric thick portion, 11 и и и и и и и и и и Barrel type piezoelectric electron
directivity angle of 30 ░ directivity, 13 и и и barrel Directivity of piezoelectric electron aperture
angle 70.5 ░, 14: Directivity of cylindrical piezoelectric, ? 0 ... Open angle, A: Diameter of
cylindrical piezoelectric, B: Cylindrical piezoelectric Height. Correction The correction of the brief
description of the drawing is as follows. -Correct the fact that the first diameter of the first child
in the first column of the specification is "the outer diameter of the child".
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jps6045599, description
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