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US 9,407,173 B2Granted
Piezo actuator having an electrode structure for a torsional vibration mode, and rotation-type ultrasonic motor including same
OwnerMan-Sun Yuninventor
Life of this patent
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Abstract
The present invention relates to a piezo actuator having an electrode structure for a torsional vibration mode, and to a rotation-type ultrasonic motor containing the same. In the piezo actuator having the electrode structure, electrodes may have different lengths from the center point of the piezo actuator in order to form an electrode structure having a pinwheel shape for enabling a torsional vibration mode. Thus, since the electrodes of the piezo actuator for generating torsional vibrations has a simple pinwheel wing structure, a rotor coupled along a groove formed in the side surface of the piezo actuator may be rotated using the torsional directional vibrations due to the electrode structure.
Claims19
A piezoelectric actuator for an ultrasonic motor, comprising:
- a plate-shaped body formed of a piezoelectric material;
- a first electrode having a pinwheel wing shape formed on one of upper and lower surfaces of the plate-shaped body and operable in a torsional vibration mode by varying lengths of the electrode wings from a central point of the piezoelectric actuator;
- a plurality of second electrodes formed between the pinwheel wings to be separated from the first electrode;
- a third electrode formed on a surface opposite the surface on which the first electrode and the plurality of second electrodes are formed;
- and
- a side groove formed in a circular shape along a side surface of the plate-shaped body,
- wherein one of the first electrode and the plurality of second electrode is connected to an input voltage,
- wherein an electrode of the first electrode and the plurality of seconds electrodes to which the input voltage is not connected, and
- wherein the third electrode is connected to a common ground.
6 more elements
An ultrasonic motor comprising:
- a plate-shaped body formed of a piezoelectric material;
- a first electrode having a pinwheel wing shape formed on one of upper and lower surfaces of the plate-shaped body and operable in a torsional vibration mode by varying lengths of the electrode wings from a central point of the piezoelectric actuator;
- a plurality of second electrodes formed between the pinwheel wings to be separated from the first electrode;
- a third electrode formed on a surface opposite the surface on which the first electrode and the plurality of second electrodes are formed;
- a side groove formed in a circular shape along a side surface of the plate-shaped body;
- a ring-shaped rotor mounted on the side groove;
- an input wire bonded to at least one of the first electrode and the plurality of second electrodes;
- an output wire bonded to an electrode of the first electrode and the plurality of second electrodes to which the input wire is not bonded;
- and
- an input/output common wire bonded to the third electrode.
7 more elements
An ultrasonic motor comprising:
- a plate-shaped body formed of a piezoelectric material;
- a first electrode having a pinwheel wing shape formed on one of upper and lower surfaces of the plate-shaped body and operable in a torsional vibration mode;
- a plurality of second electrodes formed between the pinwheel wings to be separated from the first electrode;
- a third electrode formed on a surface opposite the surface on which the first electrode and the plurality of second electrodes are formed;
- a side groove formed in a circular shape along a side surface of the plate-shaped body;
- a ring-shaped rotor mounted on the side groove;
- and
- through-holes formed through the plurality of second electrodes to guide voltage applying wires bonded to the first electrode and the plurality of electrodes to a lower side of the plate-shaped body to allow smooth rotation of the wires,
- wherein the wires are bonded to the first and second electrodes such that an input voltage is applied to all of the plurality of second electrodes, or an input voltage is applied to some of the first electrode and the plurality of second electrodes and an output voltage is obtained from the remaining second electrodes, and an electric wire for applying an input/output common voltage is connected to the third electrode.
6 more elements
An ultrasonic motor comprising:
- a plate-shaped body formed of a piezoelectric material;
- a first electrode having a pinwheel wing shape and formed on one of upper and lower surfaces of the plate-shaped body;
- a plurality of second electrodes formed between the pinwheel wings to be separated from the first electrode;
- a third electrode formed on a surface opposite the surface on which the first electrode and the plurality of second electrodes are formed;
- a side groove formed in a circular shape along a side surface of the plate-shaped body;
- a ring-shaped rotor mounted on the side groove;
- and
- vertical grooves formed at edges of the plurality of second electrodes to guide electric wires bonded to the first electrode and the plurality of electrodes to a lower side of the plate-shaped body to allow smooth rotation of the wires,
- wherein the wires are bonded to the first and second electrodes such that an input voltage is applied to all of the plurality of second electrodes, or an input voltage is applied to some of the first electrode and the plurality of second electrodes and an output voltage is obtained from the remaining second electrodes, and an electric wire for applying an input/output common voltage is connected to the third electrode.
6 more elements
An ultrasonic motor comprising:
- a plate-shaped body formed of a piezoelectric material;
- a first electrode having a pinwheel wing shape formed on one of upper and lower surfaces of the plate-shaped body;
- a plurality of second electrodes formed between the pinwheel wings to be separated from the first electrode;
- a third electrode formed on a surface opposite the surface on which the first electrode and the plurality of second electrodes are formed;
- a boss formed along a side surface of the plate-shaped body to increase rotational force when torsion is applied to the plate-shaped body;
- and
- a ring-shaped rotor mounted on the side groove and surrounding the boss,
- wherein the wires are bonded to the first and second electrodes such that an input voltage is applied to all of the plurality of second electrodes, or an input voltage is applied to some of the first electrode and the plurality of second electrodes and an output voltage is obtained from the remaining second electrodes, and an electric wire for applying an input/output common voltage is connected to the third electrode.
5 more elements
Dependencies are inferred from the claim text.