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DESCRIPTION JPS5223174

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DESCRIPTION JPS5223174
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of the configuration of a
conventional torsional vibration type transducer, FIG. 2 is an explanatory view of processing of a
conventional piezoelectric crystal plate, and FIG. 3 of one embodiment of the present invention. 4
is an operation explanatory view of FIG. 3, FIG. 5 is a perspective view of another embodiment of
the present invention, FIG. 6 is an operation explanatory view of FIG. 5, and FIG. It is explanatory
drawing of an Example. 1, 3 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и Piezoelectric crystal plate, 6,7,8,9 и и и и и и и и и и split electrodes, 4, 5 и и и и и ииConnecting
terminal. Fig. 1 (b) Fig. 2 ? (C) ?]] -167 ? 52-23174 (2) Fig. 4 Fig. 4 Fig. 5 Fig. 6-168-actual
opening 52-23174 (3) Fig. 7 Fig. 8 Correction 50.11. ?
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an
electromechanical transducer for converting electrical energy into mechanical energy or
converting mechanical energy into electrical energy. Conventionally, when realizing a mechanical
filter, an electromechanical transducer for converting an electrical energy, which can not be
indispensable, into a mechanical energy or a mechanical energy, is roughly classified into a
magnetostrictive type and an electrostrictive type. Of the two types of electromechanical
transducers, the electrostrictive type can realize a good transducer in terms of Q1 stability. In
addition, the electrostrictive electromechanical transducer is a bending vibration type
electromechanical transducer, a longitudinal vibration mechanical transducer, as a type for
exciting the vibration mode used when realizing the mechanical flight (1) rotor. There is a screw
vibration type electromechanical transducer. The present invention relates to the structure of a
screw vibration type electromechanical transducer which is small and has a large
electromechanical coupling coefficient. FIG. 1 shows a conventional vibration type
electromechanical transducer. FIG. 1 (a) shows a structure in which the piezoelectric crystal plate
2 is sandwiched between the metal rods 1 and 3, and the piezoelectric crystal plate 2 is subjected
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to screw vibration due to the high frequency electric field between the metal rods 1 and 3. I do.
The screw vibration wave propagates to the metal rods 1 and 3 through the bonding portion
between 2 and 3 between 1 and 2 to constitute a screw vibration type electromechanical
transducer. FIG. 1 (b) # (C) shows an example of the structure of the piezoelectric crystal plate in
this case. Piezoelectric crystal plates cut in two or more such that the remanent polarization
direction or a specific crystal axis direction is a circumferential direction have a structure in
which they are joined in a cut surface. As shown in FIG. 2, such a piezoelectric crystal plate is
manufactured by first cutting out a semicircular piezoelectric crystal plate so that the diameter
direction is parallel to the remanent polarization force (2) direction or a specific crystal axis
direction. It had to be assembled as shown in FIG. 1 (c). The processing of a semicircular or more
divided circle is accompanied by manufacturing difficulties such as application of the corner of
the circle, and at the same time the piezoelectric crystal plate of the structure of FIG. 1 (b), (c) is
shown in FIG. The operation of squeezing and bonding between metal rods 1 and 3) is very
difficult in manufacture, and it is also difficult in terms of uniforming the performance of the
vibrating electromechanical transducer. was there. In order to eliminate these disadvantages, the
present invention has a structure in which two or more electrodes are provided on one side of
the piezoelectric crystal plate, and two or more electrodes or the entire electrode is provided on
the other side facing the electrodes. It is an object of the present invention to provide a screw
vibration type electromechanical transducer. The details will be described below with reference
to FIG. FIG. 3 is a view showing an embodiment of the present invention, wherein 4.5 is a
connection terminal, 6 and 7 are divided electrodes attached to a piezoelectric crystal plate by a
method such as vacuum deposition or printing, 8 .9 are paired electrodes 6, 7 and paired (8)!
The divided electrodes facing each other, (Divided electrodes 9 facing the divided electrodes 6
and 7 may be full-surface electrodes. ) 2Fi piezoelectric crystal plate. FIG. 4 is an explanatory
view of the operation of the converter of FIG. 8; Now, when the electrode 9 facing the divided
electrode 2 is short-circuited and an electric signal is applied between the electrode 8 facing the
divided electrode 6, an electric field is applied in the thickness direction of the piezoelectric
crystal plate. Since the direction of this electric field and the remanent polarization direction (Xaxis direction in the case of quartz crystal) are orthogonal to each other, a thickness torsional
wave is excited. When such an operation is performed, as shown in FIG. 4, a symmetric mode ?S
and an asymmetric mode ?a are generated on the piezoelectric plate. However, in the symmetric
mode, since the displacement direction of the thickness twist wave is symmetrical with respect to
y = Q in FIG. 4, the twisting moment is offset. However, focusing on the asymmetrical mode, the
twisting moment is added because the displacement direction is reversed with respect to y = Q,
and the same action (4) as in FIG. 1 (c) is provided. FIG. 5 shows an embodiment in which only
the asymmetrical mode is excited, the counter electrodes 8 and 9 are shorted, and an electric
signal is applied between the divided electrodes 6 and 7. FIG. 6 is an explanatory view for
explaining the operation of FIG. When the electrodes are connected in this way, as shown in FIG.
6, as the electric field directions are opposite to each other as shown by the arrows even if the
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crystal axial direction or the remanent polarization direction is the same direction, the
asymmetry of the thickness screw wave Only the mode is excited and a torque moment will
occur. FIG. 7 illustrates the asymmetric mode in the case of the division number 3 and 4 of the
electrode, and provides the same operation as the case of the division number 2 of the electrode.
As described above, only by attaching the electrodes to the upper and lower surfaces of the
cylindrical piezoelectric crystal plate, a screw vibration type electromechanical transducer can be
configured, and a piezoelectric crystal plate like a conventional screw vibration type
electromechanical transducer There is an advantage that the characteristics can be made uniform
(5) because it is not necessary to cut and assemble the plate, nor to bond the piezoelectric crystal
plate to the metal plate.
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