A haptic feedback device includes a mechanical ground and a haptic surface. A plurality of connection points is connected to the mechanical ground and a plurality of connection points is connected to the haptic surface. An electroreactive wire extends around the plurality of connection point connected to the mechanical ground and the plurality of connection points connected to the haptic surface.

A piezoelectric drive device including: laminated piezoelectric element including a first end face and a second end face opposed to the first end face; a weight member attached to the first end face; and a shaft attached to the second end face, in which a moving member, engaged to the shaft movable in an axial direction, is moved by activating the laminated piezoelectric element. Inside the laminated piezoelectric element, a first internal electrode and a second internal electrode, respectively having a plane surface approximately perpendicular to the first end face and the second end face, are laminated in Y axial direction, approximately perpendicular to the first internal electrode and the second internal electrode with a piezoelectric layer in-between. The piezoelectric drive device, in which the laminated piezoelectric element is difficult to bend, even when the load is applied to the shaft from a lateral direction, is provided.

An electronic device may include a camera module which may include a piezoelectric motor. The piezoelectric motor includes a vibration exciter and a resonator. The resonator includes a main body portion and a push portion, the main body portion includes a first central axis, the main body portion is distributed on two sides of the first central axis, and the vibration exciter is fastened to the main body portion. The push portion is connected to the main body portion and distributed on the two sides of the first central axis, the push portion is of an asymmetrical structure with respect to the first central axis, and the push portion is configured to push, when excited by the vibration exciter, a driven member to move.

A small appliance device, in particular a body-care appliance device, in particular a shaving apparatus device, beard-trimming device, hair-trimming device, epilating appliance device, tattooing appliance device, toothbrush device or the like, has a drive unit which comprises at least one drive element, wherein the drive element comprises at least one magnetically shape-shiftable material.

Until now, the direct effect or the converse effect is used in piezoelectric devices to provide respectively a disturbance force in external objects via electric field or acoustic waves. The collective displacement of the internal polarized molecules of the piezoelectric materials can be used in innovative ways when the direct or the converse effect takes place. This attribute is associated when all particles which are part of macroscopic objects are widely coupled to each other via quantum entanglements and it can generate a distance induction force. Considering this, an induction force can be inducted in the external objects, thereby thrusting or pull them.

An electromechanical actuator includes a base part and an oscillation resonator having the shape of a rod. The electromechanical actuator further includes amount for mounting the oscillation resonator to the base part. The mount is configured to bear the oscillation resonator so as to be rotatable around an axis of the oscillation resonator rod relative to the base part. A driver member is mechanically coupled to the oscillation resonator. A slider or a rotator is configured to be moved by the driver member when the oscillation resonator is excited.

Electromechanical actuator (1) for an ultrasonic motor, the actuator (1) having the shape of a plate (2) comprising two main surfaces (3) and side surfaces (4) connecting the main surfaces (3) with each other, and with two equally shaped electrodes (6, 7) in symmetrically arranged to each other on a first of the main surfaces thereby defining a symmetry axis S and with at least one electrode (8) arranged on a second of the main surfaces wherein the plate (2) comprises an electromechanical material comprising a single or polycrystalline piezoelectric ceramic with its piezoelectric charge constant d.sub.31 differing from its piezoelectric charge constant d.sub.32 both in sign and in value, with the piezoelectric charge constant d.sub.31 defining a first main deformation direction of the actuator and with the piezoelectric charge constant d.sub.32 defining a second main deformation direction of the actuator, wherein the orientation of the symmetry axis S is parallel to the first main deformation direction or to the second main deformation direction, an ultrasonic motor comprising the electromechanical actuator, and a method for electrical excitation of an electromechanical actuator.

A vibration device includes a vibration body including a light-transmitting portion including first and second main surfaces opposing each other and a vibration portion that is continuous with the light-transmitting portion and vibrates with a main vibration together with the light-transmitting portion, and a piezoelectric vibrator fixed to the vibration portion. Localized vibration portions which generate a localized vibration different from the main vibration are provided at a position not overlapping with a center or approximate center of the light-transmitting portion.

A piezoelectric actuator includes a vibrator having a vibrating part including a piezoelectric element and a transmitting portion provided in the vibrating part and transmitting drive power to a driven part, and an energizing part that may energize the vibrator toward the driven part, wherein the energizing part has a base portion connected to the vibrator and a pair of spring portions integrally formed with the base portion.

A haptic feedback device includes a mechanical ground and a haptic surface. A plurality of connection points is connected to the mechanical ground and a plurality of connection points is connected to the haptic surface. An electroreactive wire extends around the plurality of connection point connected to the mechanical ground and the plurality of connection points connected to the haptic surface.