A device and a method for switchable vibration modal ultrasonic are provided. The device includes a hollow shaft, an ultrasonic motor, a limit shell, an electromagnet, a moving tool head, a vibration source and a tool head. The structure design of the ultrasonic motor, the magnetostrictive materials and the drive coil combination of different functions are configured so that, without changing the condition of components, the ultrasonic can switch mode, namely the longitudinal vibration, torsional vibration, and longitudinal and torsional vibration in three different vibration modes. During the operation of the device, different vibration modes are excited without changing the parts, which meets the machining requirements of different vibration forms. Meanwhile, the operation is more convenient and faster, and the overall design structure of the device ensures the efficient and safe operation of the device.

A piezoelectric driving device includes a substrate, a plurality of piezoelectric elements disposed on the substrate, a first groove section provided between the plurality of piezoelectric elements, and a first wire provided in at least a part of a side surface and a bottom section of the first groove section.

A six-degree-of-freedom large-stroke uncoupling large hollow series-parallel piezoelectric micro-motion platform includes a base, a movable platform top, a second platform and a first platform, wherein a first guide unit, a second guide unit, a third guide unit, a fourth guide unit, a fifth guide unit and a sixth guide unit are respectively connected in sequence to the second platform and the first platform; the first guide unit is internally provided with a first drive unit, the second guide unit is internally provided with a second drive unit, and the third guide unit is internally provided with a third drive unit; and the base is provided with a fourth drive unit, a fifth drive unit, a sixth drive unit and a seventh drive unit, the fifth drive unit is provided below the second drive unit, and the sixth drive unit is provided below the third drive unit.

A vibration actuator includes an elastic body on which at least one projection is formed and a vibrating body including an electromechanical conversion device, and drives a driven member that is in contact with a contact portion of the projection by causing an end portion of the projection to perform an ellipsoidal movement in response to a combination of two vibration modes generated in the vibrating body when an alternating driving voltage is applied. The elastic body is formed integrally with the projection and a bonding portion between the projection and the electromechanical conversion device. A space is provided between the contact portion and the electromechanical conversion device to which the projection is bonded. The spring portion is provided between the bonding portion and the contact portion and causes the projection to exhibit a spring characteristic when the contact portion is pressed by the driven member.

A device and method using the electromechanical properties of piezoelectric materials to generate and deliver electrical power to a high speed electrically powered rotatable shaft. The device has a stationary module that is connected to an electrical source; and has a rotatable module, which is mechanically connected to the electrically powered rotatable shaft. The rotatable module rotates relative to the stationary module. When the stationary module is electrically energized, the stationary piezoelectric component expands and causes the rotatable piezoelectric component to compress. When the rotatable piezoelectric component compresses, it generates electrical power transferred to the electrically powered rotatable shaft. Thus, electrical energy can be delivered to the electrically powered rotatable shaft without a direct electrical connection. The present invention is particularly useful in applications requiring large diameter through-hole dimensions.

A piezoelectric drive device includes a piezoelectric element, a vibrating plate with a concave portion provided in a side surface, and a projecting portion provided between two side surfaces of the concave portion and having a spherical shape, an elliptical shape, or an egg shape, wherein a plurality of the piezoelectric elements and a plurality of the vibrating plates are stacked, and the concave portion includes a bottom surface.

A micro-displacement amplifying apparatus comprises two sets of asymmetrical amplifying structures; each set of asymmetrical amplifying structure comprises a plurality of asymmetrical amplifying units connected in series by flexible hinges; the asymmetrical amplifying unit is used for amplifying a micro-displacement; the two sets of asymmetrical amplifying structures are in opposite positions and overlap with each other; the input end and output end are coupled to the asymmetrical amplifying unit by a flexible hinge, respectively; the input end is used for inputting the micro-displacement to the asymmetrical amplifying unit, and the output end is used for outputting the amplified displacement; the two contacting input ends are fixed and coupled to each other, and the two contacting output ends are fixed and coupled to each other. The present disclosure further discloses an amplification method of the micro-displacement amplifying apparatus.

A vibration actuator that is capable of reducing variations of pressure force and reaction force acting on a vibrator and a contact member. Vibrator devices respectively have vibrators each of which includes an elastic member and an electro-mechanical energy conversion element. A contact member contacts the vibrators and is movable in a predetermined direction relatively to the vibrators. A restraint member fixes a first vibrator device that is at least one of the vibrator devices to restrict a degree of freedom in the predetermined direction. A flexible member connects a second vibrator device that is at least one of the vibrator devices to the first vibrator device. The flexible member has predetermined rigidity in the predetermined direction and has rigidity, which is lower than the predetermined rigidity, in directions other than the predetermined direction.

An acoustic device includes a piezoelectric element, an attachment member to which the piezoelectric element is attached, and a spacer. The piezoelectric element includes first and second principal surfaces opposing each other. The attachment opposes the first principal surface. The spacer is disposed between the piezoelectric element and the attachment member in such a manner as to form an acoustic space between the piezoelectric element and the attachment member. The spacer includes an adhesive layer including a principal surface in contact with the first principal surface and a principal surface in contact with the attachment member.

A vibration device that includes a flat plate that has a first main surface and a second main surface; a vibrator that is configured to vibrate along a first direction parallel to the first main surface; a connecting member that connects the vibrator to the first main surface of the flat plate; a support member having a cavity or a recess in a portion thereof facing the vibrator; and a cushioning material connecting the first main surface of the flat plate to the support member, the cushioning material being disposed so as to not overlap with the vibrator in a plan view of the vibration device. A combined length of the vibrator and the connecting member in a second direction perpendicular to the first main surface of the flat plate is larger than a length of the cushioning material in the second direction.