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JPS63141681

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DESCRIPTION JPS63141681
[0001]
[Object of the Invention] (Industrial field of application) The present invention relates to a
displacement element using a piezoelectric element, in particular, to one that performs threedimensional displacement. (Prior Art) Piezoelectric elements have the property of expanding and
contracting when a voltage is applied, and there are also a thickness direction, a length direction,
a radial direction, a slip direction, etc. in the displacement direction. It has become. Structurally,
there are various configurations, and for example, a displacement element having a characteristic
that large displacement and large stress can be obtained, such as a so-called bimorph or a
Langevin type vibrator, has been developed. There is also known a g + -layer type piezoelectric
actuator that can be stacked on a piezoelectric element and driven at a low voltage to obtain a
large displacement. However, these actuators have a problem that they can not perform
complicated movements such as oblique directions and rotations because the displacement
direction of the piezoelectric element is expansion and contraction in only one direction.
(Problems to be Solved by the Invention) As described above, in the conventional displacement
element, the displacement is only in the vertical direction, and displacement in the oblique
direction can not be obtained. Therefore, the present invention is intended to eliminate the
above-mentioned drawbacks, and it is an object of the present invention to provide a
displacement element capable of making the displacement direction oblique. [Configuration of
the Invention] (Means for Solving the Problems) The displacement element according to the
present invention comprises three piezoelectric elements fixed to the outer surface of the driving
body, and the central axes of the respective piezoelectric elements form one intersection point. It
is characterized in that a piezoelectric element is disposed to be held. (Operation) In the
displacement element according to the present invention, not only displacement in the vertical
direction but also displacement in each direction of X-Y-Z can be achieved by using three
piezoelectric elements for the driving body. Furthermore, it can be displaced in any direction by
04-05-2019
1
changing the magnitude of the signal applied to each piezoelectric element and the fixed angle of
the three piezoelectric elements. (Example) As shown in FIG. 1, the drive shaft is composed of
three piezoelectric elements 5.6.7 each having electrodes 2, 3 and 4 on the outer surface of the
drive body 1 consisting of duralumin spheres. Fix it to be at the center of 1. The fixation of the
piezoelectric element 5, 6.7 may be via an elastic body 8.9. 10 such as duralumin. FIG. 1 shows
an embodiment of such a displacement element 10, in which the second piezoelectric element 6
is perpendicular to the first piezoelectric element 5 and further perpendicular to the central axes
of these piezoelectric elements 5 and 6. It is a case where the 3rd piezoelectric element 7 is fixed
so that it does. When the fixed positions of the piezoelectric elements 5 and 6.7 of the
displacement element 11 correspond to the X, Y and Z axes of the coordinates as shown in FIG.
The center of gravity of 1 is displaced in two directions, the Y direction when the piezoelectric
element 6 is driven by the same signal, and the X direction when the piezoelectric element 7 is
driven by the same signal.
When a signal of sin ?t is applied to the piezoelectric elements 5 and 6, it is displaced to an
angle of 45 degrees in the YZ plane, and when a signal of sin ?t is applied to the piezoelectric
elements 6 and 7, it is 45 degrees Displace to the angle you make. Then, when a signal of sin ?t
is applied to the piezoelectric elements 5 and 7, displacement at an angle of 45 degrees from the
origin in the x-7 plane is obtained. Furthermore, when a drive signal of sin ?t is applied to the
piezoelectric elements 5 and 6 ░, X is obtained. The displacement in the direction having an
angle of 45 degrees with respect to each of the Y and Z axes is performed. In the actual case of
overwhelming, a case where an alternating current of sin ?t is added as a drive signal has been
described, but if a static displacement is obtained instead of a vibration displacement, a DC signal
may be added. The fixed positions of the three piezoelectric elements may be such that the
central axes of the respective piezoelectric elements have one intersection point, and the
piezoelectric elements are formed of a piezoelectric ceramic, an electrostrictive ceramic, a
polymeric piezoelectric material, or a combination thereof And each may use a laminate. Also, for
the embodiment in which duralumin is used for both the driving body 1 elastic body) aluminum
but aluminum. Steel, copper or their alloys, resins, ceramics, rubbers, etc. may be used. According
to the present invention, it is possible to provide a displacement element which can be displaced
in any direction by changing the positions of three piezoelectric elements fixed to a driving body
or changing the magnitude of a drive signal to be applied. Can.
[0002]
Brief description of the drawings
[0003]
04-05-2019
2
Each of the drawings shows an embodiment of the present invention, FIG. 1 is a perspective view
of a displacement element, and FIG. 2 is a coordinate diagram for explaining a displacement
direction.
1 иииииии Driver 2.3.4 и и и и и Electrode 5.6.7 и и и и и и Piezoelectric element 8.9. 10 и и и и и и и Elastic body
11 и и и .... Displacement element patent application request person Marcon Electronics Co., Ltd.
04-05-2019
3
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