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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of the present invention. DESCRIPTION OF SYMBOLS 1 ... several piezoelectric electrostriction
element, 2 ... insulation outer shell, 2a ... sound wave transmission-and-reception board, 4 ...
several lead wire, 5 ... distributor.
Detailed description of the invention The present invention emits ultrasonic waves in water, and
is designed to be able to freely change the pointing angle to D,% for ultrasonic transducers that
respond to reflected waves in reverse. The present invention relates to an ultrasonic transducer.
Fish in general #! The conventional ultrasonic transducer has a single ultrasonic transducer,
although it can increase the measurement ability by changing the pointing angle rather than
under a constant pointing angle. Because the piezoelectric electrostrictive element is used, the
directivity angle is always constant. (1) Therefore, in practical use, it is necessary to prepare a
strain element of various piezoelectrics whose shape and size are set according to an arbitrary
interdigital angle, and to require a plurality of transducers each coated with an insulating shell. .
As a result, the apparatus becomes large in size and complicated, and the handling becomes
complicated, and the piezoelectric electrostrictive elements must be rounded in shape and size,
and the mass productivity is not high enough. According to the present invention, a plurality of
piezoelectric electrostrictive elements having the same shape are disposed on the same plane and
newly inserted into the inside of the insulating shell, and power is supplied to an arbitrary
number of piezoelectric electrostrictive elements according to a predetermined directivity angle.
Since the above-mentioned conventional defect is eliminated by doing this and the pointing angle
can be changed, an embodiment of the drawings will be described below. In Fig. Tl, / U lead
titanate zirconate etc. are manufactured to the same shape and size, both 11111 iK electrodes /
a, / 'b and nine piezoelectric electrostrictive elements, inward of the sound wave transmission
and reception plate of the insulating outer shell described later They are arranged in the same
plane and connected together via an adhesive (not shown). 2 is a sound wave transmitting /
receiving plate in which the plurality of piezoelectric electrostrictive elements 1 are combined,
and a synthetic rubber, synthetic resin or the like which seals the electrostrictive element
(.lamda.) Element 1 group by sealing the 2a at the opening In this case, the transmitting and
receiving plate -a is made separate from the main body 2b with an insulating shell, but it may be
integrally formed, and at least the acoustic transmitting and receiving plate is equal to the
acoustic impedance of water. Synthetic rubber 9 is made of synthetic resin. 3 is a sound wave
reflection layer filled with a sponge, cork, etc., filled so as to fill the space formed in the inside of
the insulating outer shell, and the dream is an electrode / a, / b of the plurality of piezoelectric
electrostrictive elements A plurality of connected lead wires are connected to a distributor j
which is led out from the back of the insulating shell and installed outside. This distributor j is
divided in a plurality of sets so as to form a set of seven, a set of two, a set of seven and a set of
nine piezoelectric electrostrictive elements / enclosed in an insulating shell and switching
switches ja Depending on the desired directivity angle (in the present embodiment, the
magnitude of the directivity angle is inversely proportional to the number of actuations of the
piezoelectric electrostrictive element) according to the desired directivity angle. This is a book for
feeding power to the piezoelectric element.
According to the above configuration of the present invention, when the directivity angle is
increased (J), the switch is switched to the terminal of the distributor connected to the small set
of piezoelectric electrostrictive elements, and conversely, the directivity angle is narrowed. At the
time of switching, the directivity angle can be freely changed to a predetermined angle by
switching the switch to the terminal of the distributor connected to a large number of sets of
electrostrictive elements. As described above, since the present invention can obtain two or more
types of directivity angles from one ultrasonic wave transmission / reception aK, the directivity
angles are different, and the device is simplified and miniaturized as compared with the prior art
using nine or more transducers. Besides being easy to handle, since the piezoelectric
electrostrictive elements to be used have the same shape and size, they are rich in mass
productivity and can provide many benefits such as significantly reducing the manufacturing