There is provided a wafer making it possible to stably break off the piezoelectric vibrator element. The wafer includes a piezoelectric vibrator element, a frame part, and a connection part adapted to connect the piezoelectric vibrator element and the frame part to each other, and the connection part is provided with a guide part adapted to guide force, which is applied to the connection part from one surface side in the thickness direction of the connection part when breaking off the piezoelectric vibrator element from the frame part at the connection part, to at least one side in the width direction of the connection part.

A driving device includes a plurality of motive power generators that receive electric power supply and generate motive power, the plurality of motive power generators form a plurality of sets of motive power generators in which two or more of the motive power generators are electrically parallel-connected, and the plurality of sets of motive power generators are electrically series-connected. A driving device includes a plurality of vibrators that receive electric power supply and vibrate and provide drive power for driving a driven member to the driven member, the plurality of vibrators form a plurality of sets of vibrators in which two or more of the vibrators are electrically parallel-connected, and the plurality of sets of vibrators are electrically series-connected.

A multi-spoke-type ultrasonic motor has: a rotating shaft (1), a fastening sleeve cylinder (2), a spring (3), a rotor (4), a stator (5), a fastening screw (6), and piezoelectric ceramics (7). The rotor (4), the stator (5), the spring (3), and the fastening sleeve cylinder (2) are sequentially connected via the rotating shaft (1). The stator (5) is an annular metal plate having internal spoke-like teeth. The upper surface and the lower surface of the stator (5) are provided with identical stator spoke-like teeth for contacting the rotor (4). The rotor (4) and the stator (5) are in close contact under the effect of prestressing of the spring (3). The piezoelectric ceramics (7) are annular plates; upper and lower plates respectively, are affixed on the upper and lower surfaces of the stator (5). The motor is capable of increasing the output power of the ultrasonic motor.

A hollow-cylindrical ultrasonic actuator is disclosed a central axis, an inner peripheral surface facing the central axis and an outer peripheral surface facing away from the central axis and spaced apart from the inner peripheral surface, a closed inner contour curve, a closed outer contour curve, at least one electrode, and an electromechanical material provided between opposed electrodes. In a non-actuated state of the ultrasonic actuator, a curvature of the inner contour curve or of an outer contour curve includes at least three mutually spaced-apart local maximum points.

An ultrasonic motor and method are disclosed with an element to be driven and a plate-shaped ultrasonic actuator made of polarized electromechanical material with at least two friction elements arranged on one of its side. The ultrasonic actuator can include at least two generators for acoustic standing waves and each of the generators can include two cooperating and spaced sub-generators, and one respective sub-generator of a generator is located between the sub-generators of an adjacent generator, and the sub-generators of one generator are arranged in mirror image to the sub-generators of an adjacent generator. A polarization direction of the electromechanical material of one of the two sub-generators of one generator differs from the polarization direction of the electromechanical material of the other sub-generator of the same generator.

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.

An ultrasonic actuator made of polarized piezoelectric material in the form of a single-layer or multilayer flat rectangular plate with two main faces, at least four lateral faces joining the main faces, and a thickness T, which is defined by the distance between the main faces in the direction of their surface normals, and wherein on both the one main face and the other opposite main face at least one layer including two triangular electrodes imposingly arranged and separated by a diagonal separating region, the electrodes on the one main face being offset relative to the electrodes on the other main face by 90. The ultrasonic actuator is characterized in that on at least one of the lateral faces there are two mutually spaced friction elements designed to contact at least one element that is to be driven by the ultrasonic actuator.

The invention relates to an ultrasonic motor, comprising a piezoelectric ultrasonic actuator (1) having four friction elements (4) disposed thereon, a friction surface (6) which is in frictional contact with the friction elements, and an electrical excitation device (16), wherein the ultrasonic actuator is in the shape of a ring or hollow cylinder, having an inner circumferential surface (14), an outer circumferential surface (12) and two planar end surfaces (5) connecting the inner and the outer circumferential surfaces. The four friction elements are disposed on one of the end surfaces of the ultrasonic actuator so as to be spaced equidistantly with respect to the circumferential direction, such that in each case two of the friction elements lie diametrically opposite, and the ultrasonic actuator comprises twelve identical circumferential sections (10), each of which has a generator for an acoustic standing wave to be formed in the ultrasonic actuator and the deformations of the ultrasonic actuator caused by the standing wave lead to deflections of the friction elements on a movement path inclined with respect to the end surface and/or a movement path substantially perpendicular to the end surface. Each generator has at least one excitation electrode (11), at least one general electrode (13) or a section of a general electrode and a layer of piezoceramic (15) disposed between the excitation electrode and the general electrode or the section of the general electrode.

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.

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.