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JPS60158797

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DESCRIPTION JPS60158797
[0001]
(Technical field) The present invention relates to an ultrasonic transducer in which three or more
bending transducers are plane-arranged, and triangles are made fundamental to the planearrangement to improve directivity characteristics. (Conventional art and its problems)
Conventionally, as an ultrasonic transducer using a small-sized bending type transducer, there is
a structure shown in FIG. In this figure, a support ring 2 is formed on a substrate 1, and a
bending transducer 3 of a bimorph structure in which two piezoelectric elements are bonded is
supported by the support ring 2 and ultrasonic waves of the bending transducer 3 are further
provided. A matching unit 4 is attached to the transmission / reception wavefront. The electrodes
on the upper and lower surfaces of the bending vibrator 3 are connected to the terminal pins 5A
and 5B, respectively. By the way, in the flat type structure using a small bending type vibrator as
shown in FIG. 1, the directivity characteristic is broad, and it is difficult to reduce the side lobes.
Therefore, in order to improve the directivity, a large transducer is used, or a horn is used to
narrow the ultrasonic beam. However, in the case where a large-sized vibrator is used or a
combination structure of a small-sized vibrator and a horn is adopted, there is a drawback that
the entire shape is inevitably enlarged. (Object of the Invention) As a result of various
experiments, the inventor of the present invention arranges three bent vibrators in a plane in a
triangular shape, electrically connects them in parallel, and transmits / receives waves. By
appropriately setting the arrangement interval, it has been found that the directivity
characteristic is significantly improved, and the object of the present invention is to arrange the
plane arrangement so that three or more bending vibrators have a basic shape of triangle. Also,
by setting the arrangement interval to less than three times the wavelength of the ultrasonic
wave, it is an object of the present invention to provide an ultrasonic transducer in which the
directivity characteristics are improved and the shape is reduced in size and weight.
(Embodiments of the Invention) Embodiments of the ultrasonic transducer according to the
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present invention will be described below with reference to the drawings in comparison with the
comparative example. Comparative Example 1 As shown in FIG. 2, three triangles are arranged at
an arrangement interval of six times the wavelength λ of the ultrasonic wave that transmits and
receives the ultrasonic wave transmitting and receiving element 10 having the structure of FIG.
The surface was arranged in the shape. Each element 10 is arranged, for example, so that each
element center is located at the apex of an equilateral triangle, and the vibration planes of each
bending type vibrator are on the same plane, and these are electrically connected in parallel to a
high frequency power supply. It is excited in phase. The measurement results of the directivity
characteristic in the case of excitation at a driving frequency of 40.37 kHz are as shown in FIG.
As can be seen from this figure, it can be seen that there are bimodal characteristics in which two
sound pressure maxima appear near the pointing direction (0 °), and that side lobes appear near
the maxima and the directivity does not improve much. .
As shown in FIG. 4, three ultrasonic wave transmitting / receiving elements 10 having the
structure of FIG. 1 are arranged at an arrangement interval of 4 times the wavelength, and the
other conditions are the same as in Comparative Example 1 The directional characteristics were
measured. The measurement results are as shown in FIG. 5. Again, the local maximum near the
pointing direction (0 °) has a bimodal characteristic, and side lobes appear near the local
maximum, and the directional characteristics are not improved. As shown in FIG. 6, the ultrasonic
wave transmitting / receiving element 10 of FIG. 1 having one bending type transducer is planearranged into three triangles at an arrangement interval of twice the wavelength λ of the
ultrasonic wave, as shown in FIG. . The other conditions were the same as in Comparative
Example 1. That is, each element 10 is arranged, for example, so that each element center is
located at the vertex of an equilateral triangle, and the vibration planes of each bending type
vibrator are on the same plane, and these are electrically connected to high frequency power (40,
37 kHz). They are connected in parallel and excited in the same phase. The directional
characteristics in this case are as shown in FIG. 7. The sound pressure maximum point in the
directional direction (0.degree.) Exhibits a single-peak characteristic, the side lobes on both sides
thereof are significantly suppressed, and the directional characteristics are greatly improved.
(Effects of the Embodiment) As is apparent from the above description, three ultrasonic wave
transmitting / receiving elements 10 provided with one bending type vibrator as in the
embodiment are arranged in a triangle shape, and an arrangement interval of 2λ When it is set
to, the effect of improving the dignified directional characteristics can be obtained, and thereby,
it is possible to realize an ultrasonic transducer which is small (thin), lightweight and excellent in
directional characteristics. In addition, it has become easier to produce more than equivalent
performance to those using large transducers and horns. As a result, it can be sufficiently used
for a distance meter, an object detection apparatus, a remote control apparatus, etc. used for
continuous auto 7 such as VTR. (Supplemental Description of the Embodiment) In the above
embodiment, a case is shown in which three ultrasonic wave transmitting / receiving elements
10 of FIG. 1 provided with one bending type transducer are used, but as shown in FIG.
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Alternatively, three bending vibrators 3 may be provided on the same substrate 1A. Further, each
element may be individually provided in each case, or may be provided in three cases of six
element forces. It has been confirmed by the present inventors that if the arrangement interval is
less than three times the wavelength λ of the ultrasonic wave used, the effect of improving the
directivity is obtained. Further, the configuration of each ultrasonic wave transmitting / receiving
element 10 does not necessarily have to be the same as that of FIG. 1 and can be appropriately
changed. For example, the thing of the unimorph structure which bonded the piezoelectric
element and the metal plate together as a bending | flexion type | mold vibrator can be used.
(Effects of the Invention) As described above, according to the ultrasonic transducer of the
present invention, three or more bending type transducers comprising a piezoelectric element or
a piezoelectric element and a metal plate are arranged in a triangular shape. Since the
configuration is made and the arrangement interval is less than 3λ, it is possible to achieve size
reduction and weight reduction and to achieve a drastic improvement of directivity.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view showing an example of a conventional ultrasonic transducer, and FIG.
2 is an arrangement interval in the case where ultrasonic transmitting and receiving elements
provided with one bending type transducer are arranged in a triangle. Explanatory drawing
which shows the array configuration of the comparative example 1 which is 6λ, FIG. 3 is a graph
showing the directivity characteristic in the case of the comparative example 1, and FIG. 5 and 6
are graphs showing directivity characteristics in the case of Comparative Example 2, FIG. 6 is an
explanatory view showing an embodiment of the ultrasonic transducer according to the present
invention, and FIG. 7 is directivity characteristics in the case of Embodiment And FIG. 8 is a
perspective view when three bending type vibrators are provided in common to a substrate.
DESCRIPTION OF SYMBOLS 1 ... Board | substrate, 2 ... Support ring, 3 ... Bending type | mold
vibrator | oscillator 4, 4 ... Matching device, 10 ... Ultrasonic wave transceiver element. Patent
Assignee TDK Co., Ltd. Attorney Attorney Murai Takashi 3 Figure 5 ft Figure 5 keeping
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