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JPS5654199

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DESCRIPTION JPS5654199
Page 1 Specification 名称 Title of the Invention Ultrasonic Transducer 1 Resonator with multiple
resonance projections, so that each resonance, the projections correspond to each other, and so
that the tip of the resonance projections face outward An ultrasonic transducer characterized in
that each end pressure of the piezoelectric element is fixed.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer used in an underwater acoustic transducer or the like. Conventionally, a vibrator
using a piezoelectric element has been used as a Langevin vibrator for the purpose of relatively
low frequency. This is because, conventionally, because the adhesive between the piezoelectric
element and the metal resonator has a large loss at a high frequency, and the vibrator itself is
small at a high frequency, a piezoelectric having a shape and a size corresponding to that
frequency The reason is that it could be used only with the device. Therefore, conventionally, in
the case where only the piezoelectric element is used, the piezoelectric element is made smaller
than the wavelength to a size that is considered to make piston movement, and a plurality of such
elements are used by being arrayed. Fig. 1 shows a conventional oscillator used for relatively
high frequency, and a plurality of piezoelectric stacks of equal length EndPage: 13100 1 end
electrodes each have electrodes 2.3 These piezoelectric elements 1 are embedded in the holding
material 4 in a predetermined arrangement except for the vicinity of one end where the
electrodes 2 are provided, and the holding material 4 is accommodated in the frame 5. FIG. 2
shows a conventional vibrator having a low--that is, a wide band frequency characteristic, in
which case it is used for a plurality of piezoelectric elements 6 and 7.8 'having different lengths,
and a frame by a holding material 4 The array support 10 is in five. However, in such a
conventional vibrator, since it is necessary to cause a piston movement of the acoustic radiation
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surface of the piezoelectric element 1.6.7.8, the size of the piezoelectric element 1, 6 ° 7.8 is
generally In order to make it smaller than the above, and to sharpen the directivity
characteristics, it is necessary to use a large number of arrays K, and the operation of arranging
in this holding material 4 was difficult. Also, the piezoelectric element 1.6.7.8 has many
requirements for performance items, and is small but expensive, and there is a demand to reduce
the number of used piezoelectric elements by a small amount from the viewpoint of cost
reduction. An object of the present invention is to provide an ultrasonic transducer capable of
simplifying the arrangement operation and reducing the number of expensive piezoelectric
elements. The present invention is made by paying attention to the point that the adhesive and
bonding technology are improved, etc., and each resonator has a plurality of resonance
projections forming an acoustic radiation surface on both surface end surfaces of the
piezoelectric element. The object of the invention is to achieve the above object by securing the
projections so as to correspond to each other and to fix the tips of the resonance projections
outward. Hereinafter, embodiments of the present invention will be described based on the
drawings. Here, the same or corresponding components in the respective embodiments use the
same reference numerals, and the description of the overlapping components is simplified or
omitted.
3 and 4 show a first embodiment of the present invention. In these figures, electrodes 12 and 13
are formed on both left and right end surfaces in FIG. 3 of the disk-shaped piezoelectric element
11, respectively, and Fi (-1 and (+) are applied to the electrode 12 It is supposed to be Resonators
15A and 115B each having an end face having substantially the same area as that of the
piezoelectric element 5 are fixed to the end faces of the piezoelectric element 11 through an
adhesive 14 at the end face. The other ends of the resonators 15A and 15B are formed on a
plurality of resonance protrusions 16A and 16B having the same height and the same thickness,
and the pair of vibration and vibration protrusions 16A and 16B In order to correspond to each
other, that is, to make the axes coincide with each other. The heights of the resonance
protrusions 16A and 16B of the resonators 15A and 15B are set such that the total length of the
vibrator is half-wave resonance. In this case, the vibration amplitude is small near one part of the
piezoelectric element 11, The vibration amplitude becomes maximum at the tip end faces of the
“resonance projections 16A and 16B” so that sound waves can be emitted into a medium such
as water. In addition, the thickness of these resonant projections 16A and 16B is made
sufficiently thin compared to the wavelength, and the bi-square "stone motion can be performed
at the end face. In such a configuration, when a predetermined voltage is applied to the
electrodes 12 and 13 K, the piezoelectric element 11 performs electric / vibration conversion,
and the acoustic radiation surface at the tip of the resonant projections 16A and 16B, which is
sufficiently thinned compared to the wavelength, The sound is emitted. According to the sixth
embodiment, the expensive piezoelectric element 11 is one, and the inexpensive resonators 15A
and 15Bi are used to constitute the acoustic radiation surface, so that the extremely low cost ILc
can be provided as a whole. Further, since each of the resonance protrusions 16A and 16B can
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be made sufficiently thin as compared with the wavelength, the vibration of the end face can be
in the same phase as each of the resonance protrusions 16A and 16B and can make the piston
motion effective. . Further, since the resonators 15A and 15B in which the respective resonance
protrusions 16A and 16B are integrated at the root portion are fixed by the piezoelectric element
11Vc adhesive 14, one or one is arranged in the conventional bonding material. The work is
much easier than the filling process. FIGS. 5 to 7 show a second embodiment of the present
invention, in which both valve pendulums are screwed in addition to the adhesive. FIG. 5 shows
the piezoelectric element 11 used in this embodiment, and one through hole 17 is provided at
the center of the piezoelectric element 11.
As shown in FIG. 6, the electrodes 12 and 13 are provided on both end surfaces of the
piezoelectric element 11, and the piezoelectric element 11 has EndPage: 27 pages l so that the
electrodes 13 of the same polarity are opposed to each other. Two piezoelectric elements 11 are
opposed via an adhesive 14t. Of course, the female screw 18 is formed at the axial center of one
of the resonators 15A and 15B, and the piezoelectric element 11 is formed at the middle 56 in
the axial direction of the other resonator 15B. The male screw 19 having a smaller diameter is
formed by the resonator 15A which is threaded through the through hole 17ft and is screwed to
the female screw 18. The female screw 18 and the male screw 19 are fastened via the two
piezoelectric elements 11. Thus, the gap between the piezoelectric elements 11 and between the
surface of the piezoelectric elements 11 and the pendulums 15A and 15B of both the prefectures
15A and 15B is eliminated, and the gap of the quick adhesive 14 is eliminated. The piezoelectric
element 11 and the resonators 15A and 15B are fixed so as to be kept thin. At this time, since the
cross-sectional area of the piezoelectric element 11 is sufficiently large for the fastening by the
internal thread 18 and the external thread 119 of each of the resonators 15A and 15B, bias
compressive stress by a bolt is made as in the conventional bolted Langevin vibrator It is not
necessary to tighten as much as possible, and it is sufficient to fasten the layer of the adhesive 14
as thin as possible and to tighten as evenly as possible as a whole before the adhesive 14 is
cured. According to such a present embodiment, not only the same operation and effect as the
first embodiment can be exhibited, but also the positioning of the resonators 15A and 15B is
determined by the female screw 18 and the male screw 19. There is a fire effect on the
assembling operation to be easier. FIGS. 8 and 9 show a third embodiment of the present
invention, in which the heights of the resonant projections in the first embodiment are made
different. That is, in the present embodiment, a plurality of, for example, seven resonances each
integrally provided in each of the resonators 15A and 15B attached to both end surfaces of the
piezoelectric element 11 via the electrodes 12 and 13 and the adhesive 14. Projections 20A, 20B,
21A, 21B. Among the 22A and 22B, the resonance protrusions 20A and 20B, the resonance
protrusions 21A and 21B, and the resonance protrusions 22A and 22B provided at
corresponding positions of the piezoelectric element 11 have the same height, and the resonance
protrusions 20A. 20B, 21A, 21B, 22A, 22B have different heights from each other, and an
intermediate height of the resonance protrusion 21A.
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21B is provided from the upper right in FIG. 9 to the lower left IC 3 sets, etc. on page 9; the
highest contact bumps N20A, 20B are provided in the upper and lower icz sets in FIG. 9 and are
provided at the lowest resonance protrusions 22A, 22B. Two sets are provided on the upper left
and lower right in FIG. These resonance protrusions 20A, 20B, 21A, 21B, 22A. 22B is designed to
support half wavelengths at respective heights, and as viewed from the lift end face, as if it had
staggered complex resonance (arranged, each of the resonance protrusions 20A to 22B is The
dynamic range is maximized and the sound wave is emitted into the medium. In such a
configuration, when a predetermined voltage is applied to the electrode 12 ° 13 of the
piezoelectric element 11, the characteristics shown in FIG. 1θ are exhibited. That is, in FIG. 10,
when the frequency is taken along the horizontal axis and the sound pressure is taken along the
vertical axis, the peaks of the sound pressure with the relatively low frequency f and the entire
center are obtained by the highest resonance projections 20A and 20B. A certain characteristic P
is obtained, and the characteristic Q with a peak of sound pressure centered on the intermediate
frequency f2 is obtained by the resonance protrusions 21A and 21B of the middle height, and the
resonance protrusion 22A and 22B the lowest. There is a mountain of sound pressure centered
on a relatively high frequency f! □ The characteristic R is obtained n1 The frequency f, f2 as a
whole. f. It can be seen that a gentle complex characteristic T with small peaks on page 10 'can
be obtained, and an extremely broad band (low Qm) electroacoustic transducer can be realized.
According to the present embodiment as described above, it is possible to obtain the same effect
as that of the first embodiment and to obtain a low Qmf, that is, a wide band oscillator. 11 to 13
Kn A fourth embodiment of the present invention is shown. This embodiment is a combination of
the two-valve pendulum ft in the third embodiment, which is apt to be screwed and fixed. Is
substantially the same as that of the second embodiment. That is, electricity f! The piezoelectric
elements 11 provided with 12 and 13 are stacked so that the same pole sides face each other,
and an external thread is provided in one of the resonators 15B through the through hole 17
provided in the piezoelectric element ll. The part 19 is provided in the other resonator 15A and
screwed into the female screw part 18. Thus, the two piezoelectric elements 11 and the two
prefectures pendulums 15A and 15B are fixed, and the adhesive 14 is interposed between the
two piezoelectric elements 11 and between the two prefectures pendulums 15A and 15B and the
piezoelectric element 11 The layer thickness of is as thin as one. EndPage: p. 311 (1) According
to this embodiment as described above, the same operation and effect as those of the third
embodiment and the second embodiment can be exhibited.
Note that the number of resonant projections, the height, etc. of the resonant projections can be
appropriately changed as necessary, and the female screw portion and the male screw portion
are provided with a female screw portion or a male screw portion in any of a pair of resonators.
Also, in short, it is sufficient if they can be screwed together. As described above, according to the
present invention, it is possible to provide an inexpensive ultrasonic transducer that can reduce
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the number of expensive piezoelectric elements and can be applied to a relatively high frequency
range 1 region. .
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are sectional views showing different
examples of the conventional ultrasonic transducer, and FIG. 3 is a half sectional view showing a
first embodiment of the ultrasonic transducer according to the present invention. 4 is a right side
view of FIG. 3, FIG. 5 is a side view of a piezoelectric element used in the second embodiment of
the present invention, and FIG. 6 is a half sectional view showing the second embodiment of the
present invention Front view, Figure 7? · · · Right side view of Fig. 6, Fig. 8 is a partially cutaway
front view showing the third embodiment 0 of the present invention, Fig. 9 is a right side view of
Fig. 8, Fig. 1 is a third view FIG. 11 is a side view of the piezoelectric element used in the fourth
embodiment of the present invention, and FIG. 12 is a fourth embodiment of the present
invention. And FIG. 13 is a right side view of FIG. 11: Piezoelectric element 12, 13: electrode 14,
adhesive agent 15A. 15B: Resonator, 16A, 16B, 20A, 20B, 21A, 21B, 22A. 22B: resonant
protrusion, 17: through hole, 18: internal thread, 19: external thread. Attorney Attorney
Attorneys Akimoto Akimoto Figure 1 Figure 2 Figure 3 171j Figure 4 Figure 1 Figure 5 Figure 1
EndPage: 4 Figure 7 Figure 9 Figure 10 Figure 11 Figure 91 (-Figure 12 EndPage: 5
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