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DESCRIPTION OF THE PREFERRED EMBODIMENTS Title 1 of the Invention Vibrators A number
of holes are penetrated in the thickness direction, and one or more pairs of electrodes are
provided opposite to the surface provided with the holes, one of the one or more pairs of
electrodes An oscillator equipped with a radiation plate.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to an improved ultrasound
transducer. Conventionally, ultrasonic wave transmitters (oscillators) used for fish finders,
sounding machines, sonars, etc. are generally cylindrical, prismatic or ring-shaped, so it is
difficult to make one with a low Q, Also, by including a plurality of frequencies depending on the
diameter, thickness, height, etc., or having multiple vibration directions, it is possible that the
ultrasonic vibrations having different frequencies respectively interfere with each other to obtain
ideal vibration output characteristics. It was impossible. The present invention, in order to
eliminate the disadvantages of the prior art example, a large number of holes are penetrated in
the thickness direction to remove radial and lateral vibrations, so that an ideal vibration output
characteristic can be obtained. To provide Hereinafter, the embodiment will be described in detail
with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which 1
is an element in which a large number of holes 2 are opened in the thickness direction, 3 ° 4 is
an electrode fixed to the open face of this element 1, Reference numeral 5 is a radiation plate
fixed on the electrode 3. Since the element 1 having a large number of holes 2 is thus seen as a
stack of a large number of rod-like elements each having a small cross section, the lateral
vibration of the rod is reduced and the longitudinal direction of the rod is almost eliminated. The
directional characteristics of the transducer of this embodiment are as shown in FIG. 2 (a).
However, in the case of the conventional vibrator, as shown in FIG. 2 (b), the vibration in the
radial direction, the thickness direction and the lateral direction is large, and there is a
disadvantage that many unnecessary vibrations are generated outside the directivity direction.
FIG. 3 shows another embodiment of the present invention. The same reference numerals as in
FIG. 1 indicate the same parts, but in this embodiment, a large number of transducers 1a, 1b, 1c
are used. . EndPage: 1... Is adhered to form a cylinder 6, and a large number of holes 2 are
provided between the inner side 6 a and the outer side 6 b of the cylinder 6. In this embodiment
configured in this manner, the ultrasonic waves emitted from the respective transducers 1, 1b, 1c
+... Are very good in directivity, and are particularly excellent for sonars. . In the embodiment of
FIG. 3, a large number of transducers 1a, Ib. lc,... are bonded, but as shown in FIG. A plurality of
pairs of electrodes may be provided, and radiation plates may be provided on the outer
electrodes. As described above, according to the present invention, Q can be lowered by
providing a large number of holes in the thickness direction, and a small portion between the
perforated holes can be considered as a rod having a small cross-sectional area. The low motion
in the surface direction and the high motion in the longitudinal direction give pure modes at the
radiation surface, there is no interference of other modes, so there are few sub poles, excellent
directivity and interference with each radiation surface Since the number of holes is small and
the distance between the holes is narrow, it is easy to make a notch between these holes, so that
the whole shape can be freely created, and a lightweight, robust, inexpensive vibrator is provided.
be able to.
4. Brief description of the drawings. FIG. 1 is a block diagram of an embodiment of the present
invention, FIG. 2 is a diagram showing directivity characteristics of the present invention and the
prior art, FIG. 3 and FIG. FIG. 10 is a block diagram of another embodiment of the present
invention. ■ ......... element, 2 ........ holes, 3.4-tune wound electrode, 5 ......... radiation plate. Patent
applicant Keisuke Honda Multi-agent agent Tsuneji Hoshino Kazuo Suzuki, (0) Fig. 0 (0) 1 (bl2)
(blEndPage: 2
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