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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a conventional apparatus, and FIGS. 2 and
3 show an embodiment of the present invention. 1 and 2 indicate transducers, 3 and 6 and I
indicate windows, 5 and 8 and 9 and 10 indicate ultrasonic reflecting materials, and 11 indicates
a circular hole.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer having directivity for use in horizontal underwater detection and the like, and in
particular, to predetermine the shape and size of the transducer. The invention relates to an
ultrasonic transmitter-receiver capable of obtaining a directional transmitting / receiving beam tobtained by covering a submaximal by covering with super M'lf1 residual material.
Conventionally, the gods have been adopted as a method of obtaining a directional beam. (As one
of them, a group oscillator composed of vibrators of the same size is applied with weighted
signals with different amplitude or phase difference Δ−1 胤 2 to obtain a directional
transmission / reception himme b. As another method, as shown in FIG. 1 (the gradient 1 shows,
a large number of transducers 1.1. ... Specifying 7) no positional relationship, same position-same
amplitude-5)-phase 1 of these) to know whether or not to drive the oscillator. The directivity
characteristics obtained are as shown in FIG. 1 (b1). The directional characteristics are described
on page 11 of "Magnetostrictive movement and supersonic a- +" by Kimitsu Kikuchi, published by
Corona Co., Ltd. on June 80, 1984. Ru. In this conventional method, as described above (FIG. 1A),
it is necessary to use a large number of vibrators of different sizes, and it is possible to
manufacture a large number of vibrators according to their dimensions in a variable manner.
Therefore, the desired crystal 1 "marriage is suppressed and the directivity characteristics are
even, and the number of oscillators is large, so the wiring for supplying signals becomes
complicated, etc. The idea of the problem 7t solves these problems and will be described with
reference to the drawings below. FIG. 2 shows an embodiment of the present invention. The
vibrator 28 has a hole 8 whose shape and size are predetermined. S。 Ru covered tlcIls by the
ultrasonic reflective material to be ... or bored. The vibrator 2 is connected to the negative driving
device C]. When driving by the driving device, the vibrator 2 radiates an ultrasonic wave from the
windows 3, 8 ... and is weighted by the windows 8.3 ... As shown in FIG. 1 CB +, η directional
viscous force, as shown in FIG. In addition, even when a portable male 2 receives a reflected
signal from a remote place 1, the same directional characteristic shown in FIG. 1 (B +) is
generated. 3 (Gradients and [Bl and FCl show other embodiments, and the vibrator 2 has a
window 6.7 different in shape force and a large number of circular holes lid, perforated
ultrasonic reflector 8 and 9 and 10 forces, (every t'L is n. Also in these cases, it was possible to
obtain the directional characteristics in which the sub-poles were suppressed.
In the above embodiment, a predetermined window is formed by ny (ultrasonic reflecting
material 5.8, 9, 101-vibrator 8 is tightly packed and held 7c5 +, reflector and vibrator It is also a
function to provide a VC gap between them. 1) As described above, according to the present
invention, n is manufactured as many vibrators of different sizes vi-precisely dimensioned.
Because it is good to drill the window of Vc, it is possible to provide an ultrasonic transducer
having a directional wedge which can be easily manufactured with precision Vc.