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DESCRIPTION JPS5254415

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DESCRIPTION JPS5254415
2 Inventors ■ Japan Patent Office 0 JP-A 52-5441.5 0 Open JP (1977) 5, 27j, fof, c specification
1, title of the invention
Ultrasonic transducer
8. Detailed Description of the Invention Conventionally, in the case of a single ultrasonic
transducer using a plate-like piezoelectric element such as quartz, barium titanate ceramic, lead
titanate-based piezoelectric ceramic, etc., near the resonant frequency in the thickness direction
of the plate At frequencies other than the above, coupled vibrations influenced by transverse
(radial) fundamental and higher-order vibration modes are excited, and the vibrating plane in the
thickness direction does not vibrate in the piston, thus realizing a transducer with a desired beam
width. It has the drawback of being difficult to do. Furthermore, the transmission / reception
sensitivity frequency characteristics for the frequency lower than the thickness direction
resonance frequency also did not become monotonous due to the presence of the fundamental
resonance high-order resonance in the lateral direction. Also in the cylindrical piezoelectric
ceramic using vibration in the height direction, similarly, the vibration surface in the height
direction does not vibrate in a piston due to the influence of vibration modes in different
directions, and the frequency characteristic does not become monotonous. Therefore, a
transducer with a monotonous frequency characteristic in the form of combination of a disk and
a cylinder to suppress directivity has not been realized in practice. In order to eliminate these
drawbacks, the present invention suppresses the resonance mode below the direction resonance
frequency in the thickness direction 5) by cutting the piezoelectric ceramic disk and the cylinder
into a mesh shape or a radial shape, and transmits and receives wave sensitivity. The purpose is
to make the characteristics monotonous, and to suppress the directional secondary EndPage: 1
pole in the combination of the disc and the cylinder, and the drawings will be described in detail
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below. FIG. 1 is a cross-sectional view of an ultrasonic transducer showing the basic
configuration of an embodiment of the present invention, in which 1 is a mesh of a piezoelectric
ceramic disk which is cut and called "dicing disk piezoelectric ceramic". To The numeral 2 is a
piezoelectric ceramic cylinder which has been radially cut and is called a dicing cylindrical
piezoelectric ceramic. 3 is a backing material, 4 is a case, 5 is a cable, and 6 is a molding material.
The main part of the present invention resides in the dicing disc piezoelectric ceramic 1 and the
dicing cylindrical piezoelectric ceramic 2, and the side view of the dicing disc piezoelectric
ceramic 1 in FIG. 1 is shown in FIG. Show. Further, FIG. 4 shows a side view of the dicing
cylindrical piezoelectric ceramic 2 in FIG. 1, and FIG. 5 shows a plan view thereof. In FIGS. 2 and
8, the piezoelectric ceramic disc j polarized in the thickness direction and having the electrodes
1a and 1b on both sides extends from the one side to the electrode 1b. It is cut into a mesh at
intervals equal to or less than the thickness, whereby it is cut into a large number of minute
portions 7. The cut electrode 1 a is electrically connected to constitute one of the electrodes of
the piezoelectric ceramic disk 1. In FIGS. 4 and 5, the piezoelectric ceramic 1 cylinder 2 which is
polarized in the height direction or thickness direction and has the electrodes 2a and 2b on the
polarization plane is viewed from one side of the electrode 2b. The grooves are cut at equal
intervals and in a radial pattern at intervals equal to or less than the depth 迄 the height, thereby
being cut into a large number of minute portions 8.
The cut electrode 2a is electrically connected to form a one-side electrode of the piezoelectric
ceramic cylinder 2. Since it has such a structure, the minute parts 7 and 8 surrounded by the cuts
each vibrate like the single piezoelectric ceramic. In addition, the width is smaller than the
thickness or height due to the incision, so the thickness direction resonance is higher than the
thickness direction resonance in the transverse direction. Therefore, the thickness direction
resonance is not the first fundamental co-vibration, and the vibration component in the thickness
direction is the main component below that frequency, and the dicing disk piezoelectric ceramic
1 and the dicing cylindrical piezoelectric ceramic 2 perform piston vibration. Become. By
combining these piezoelectric ceramics that cause piston vibration, it is possible to realize an
ultrasonic transducer with suppressed directivity sub pole by making the transmission /
reception sensitivity frequency characteristic monotonous. FIG. 6 is a transmission / reception
sensitivity frequency characteristic diagram of this embodiment, 9 is transmission sensitivity and
10 is reception sensitivity. FIG. 7 is a diagram showing the directivity of this embodiment, which
is an example driven at a frequency lower than the resonance frequency. The combination of the
dicing disk piezoelectric ceramic 1 and the dicing cylindrical piezoelectric ceramic 2 in the
present invention is not limited to one by one, but may be combined using a plurality of dicing
cylindrical piezoelectric ceramics 2 having different average diameters. As is apparent from the
above description, since the ultrasonic transducer according to the combination of the
piezoelectric ceramic disk and the cylinder cut as in the present invention vibrates in the piston
even at the resonance frequency or less, the transmission / reception sensitivity frequency
characteristics There is an advantage that the transmitter / receiver of the present invention can
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be monotonously suppressed as a directivity sub pole, and noise due to the presence of the sub
pole can be reduced.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of an ultrasonic transducer
showing the basic configuration of an embodiment of the present invention, and FIGS. 2 and 3
are side views and a plan view of a dicing disk-piezoelectric ceramic. Figure 4, Figure 4 and
Figure 5 are side and plan views of the dicing cylindrical piezoelectric ceramic, Figure 6 is the
transmission / reception sensitivity frequency characteristics of this embodiment, and Figure 7 is
a diagram showing the directivity of this embodiment. is there. DESCRIPTION OF SYMBOLS 1: ..
dicing disc piezoelectric ceramic, 1a, 1b ... electrode, 2 ... dicing cylindrical piezoelectric ceramic,
2a, 2b ... electrode, 3 ... backing material, 4 ... case, 5 ... · · Cable, 6 · · · Mold material, 7.8 · · ·
minute portion, 9 · · · wave transmission sensitivity, 10 · · · wave reception sensitivity. Patent
applicant Oki Electric Industry Co., Ltd. Agent Suzu 'Tokiaki EndPage: 2 Fig. 2 Fig. 3 B Fig. 6 Fig.
7 Fig. 5, list of attached documents (1) one statement (2) one drawing (3) one letter of attorney
(4) ) Applications 1 copy EndPage: 3
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