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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b show an embodiment of the present
invention in a perspective view and a vertical sectional view, and FIG. 3 shows a conventional
embodiment in a sectional view and a top view. Fig. 1 W '1 (1 ° C テ n 7 (a) (b) Fig. 3? Fig. 2? · *
(A) 3)) ;: Ko I] ■ ー r 尼 尼 尼
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of
the transducer ITrangdusers +, that is, the structure of the ultrasonic wave transmitter / receiver
using the transmission used in the ultrasonic band or the ceramic used for the love signal. Apply
pressure while drawing. The feature of the present invention is to make the manufacturing
process easy at the same time as improving the characteristics. The embodiment is shown in FIG.
7 (a) axis) as shown in FIG. 7 (a)), a vibrator made of a polygonal or circular ceramic having
piezoelectricity, that is, the piezoelectric disc 3 is turned into a circle of dark cone I Fig. 2 is a
plan view showing a circular disc of a material which is easy to join with the placement of a cone
and a joining medium having a conical shape, and Fig. 2 (b). In the prior art, as shown in FIG. 3,
three depressions or holes were provided at the center of the ceramic piezoelectric disk 33, and
it was usual to place and join the tip NJ / of the cone. For this reason, providing a recess or a hole
in the ceramic material 31t has the following major problems. l It is not good for powder
metallurgy to provide hollows or holes. The product has a large degree of damage to the mold,
and the product is completely stable, etc. In order to activate 2 ceramics, there is a risk of electric
field breakdown noise occurring in production 1 I was there. Furthermore, because it is difficult
to fully activate the center portion 3s that most significantly affects the characteristics as a threepiezoelectric disk, it was not possible to use 1 g to prevent the deterioration of the
characteristics. That is, it is impossible to perform electrode processing for activating the vicinity
of the central portion, or electric field breakdown at the polarization step of the product. If it
comes to the present invention described in detail on these defects, there is nothing to do with it,
so it has industrial value.