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JPS533265

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DESCRIPTION JPS533265
Specification 10 Title of Invention
Array transducer
3. Detailed Description of the Invention The present invention relates to an array type ultrasonic
transducer having a single motion mode. A conventional array type ultrasonic transducer is
shown in FIGS. 1 is a plan view of the piezoelectric plate, and FIG. 2 is a cross-sectional view
thereof. The conductor 2 is adhered to the piezoelectric ceramic plate 1 polarized in the
thickness direction, and the conductor 2 is adhered. An array type transducer having an
independent acoustic radiation surface is constituted by the piezoelectric plate pieces 51.52,..., 5
and between the common electrode of the conductor 2 and the divided electrodes. Therefore,
when the array type transducer having such a configuration is used in the normal thickness
direction vibration mode, the length dimension in the cutting direction and the parallel direction
is larger than in the thickness direction every method, so the frequency is lower than the
operating frequency. There is a defect that the divided vibration occurs in the vicinity of the use
layer '(' 2) EndPage: 1 wave number. −; In order to eliminate these drawbacks, the object of the
present invention is to show the first embodiment of the present invention, and FIG. 8 is a plan
view of the piezoelectric plate, FIG. The figure is a cross-sectional view thereof, and FIG. 5 is a
side view thereof. According to the present invention, as shown in FIG. 5, the piezoelectric plate
11 provided with a partial pole in the direction of thickness has a surface opposite to the
acoustic radiation surface! Grooves 14m having a depth not reaching the electrode 13 of the
acoustic radiation surface at a constant distance from the pole 12 side, 246. ... 14k, the divided
electrodes 12 are electrically connected to form a common electrode, and from the electrode 13
side of the acoustic radiation surface, as shown in FIG. 8 and FIG. Grooves 148,14. . ・・・。 A
plurality of independent acoustic radiation surfaces 168.162,..., Having grooves 151.15 □,. An
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array type transducer having an independent acoustic radiation surface between the divided
electrodes 13 of the acoustic radiation surface and the common electrode on the opposite
surface divided into “n + 1”. る。 -Thus, in the present example, the grooves, which are
inserted from the opposite surface for one acoustic radiation surface, into small parts: 40, so a
low frequency in the length direction? Since the vibration mode is suppressed and it becomes
close to a single vibration mode in the thickness direction, there is an advantage that it is also
possible to remove cannabis which is divided in the vicinity of the operating frequency and flat
frequency characteristics. FIG. 6 shows a second embodiment of the present invention in which a
groove having a depth not reaching the electrode 13 of the acoustic radiation surface is inserted
from the side opposite to the acoustic radiation surface, and the conductor 17 is adhered to the
opposite surface. After forming the common electrode, the groove 15 is formed from the
electrode 13 side of the acoustic radiation surface to a part of the piezoelectric plate 11 and the
conductor 17. , 15 □,..., 15n, which also has the same effect as that of the first embodiment.
In the first embodiment and the second embodiment, the resonance frequency due to the
coupling vibration of the small block is gradually made different by broadening the groove
spacing on the side other than the acoustic radiation surface. There is also an advantage of being
able to Further, in the first embodiment, even when the common electrode side is an acoustic
radiation surface, an array type thermal receiver having an independent acoustic radiation
surface can be configured, so the same effect as described above can be obtained. . As described
above, since the present invention can construct an array type transducer having a single
vibration mode in the thickness direction, it can be efficiently performed in the case of scanning
1-m.
4, Brief description of the drawings Figure 1, Figure 2! 8 is a plan view, a sectional view, etc., of a
conventional array transducer, and FIG. 8 is a plan view of an array transducer showing a first
embodiment of the present invention, and FIG. , A side view, FIG. 6 is a second agate of the
present invention! FIG. 6 is a cross-sectional view of the array transducer shown in FIG. 11 ...
Piezoelectric body, 12.23 ... electrode, 14, -14. 15 □-15 ... groove, 16-16n + 1111-divided
acoustic radiation surface, 17 ... conductor. EndPage: 2
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