Abstract: The invention relates to a lead-free piezoceramic material based on bismuth sodium titanate (BST) having the following parent composition: x(Bi0.5Na0.5)TiO3-yBaTiO3-zSrTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0?z?0.07 or x(Bi0.5Na0.5)TiO3-yBaTiO3-zCaTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0<z?0.05 or x(Bi0.5Na0.5)TiO3-y(Bi0.5K0.5)TiO3-zBaTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0?z<1, characterized by addition of a phosphorus-containing material in a quantity that gives a phosphorus concentration of from 100 to 2000 ppm in the piezoceramic material.

Abstract: The present disclosure relates to an electromechanical actuator, having a stack arrangement made of ceramic basis material having electromechanical properties and electrodes as well as a ceramic insulation for operation/use of the actuator in a humid environment. To ensure a long service life of the actuator with increased electromechanical expansion, an exemplary structure of the ceramic insulation has a smaller average grain size than the structure of the ceramic basis material. A method for the production of an actuator having ceramic insulation and a method for controlling such an actuator are also disclosed.

Abstract: A method for producing a piezoelectric stack actuator and a piezoelectric stack actuator are disclosed. To increase service life of a piezoelectric stack actuator made up of individual actuators, includes providing at least two actuators the method and designed and configured to generate a deflection along an axis (A) when electrically activated; and coupling the at least two actuators to form the stack actuator such that deflections of the actuators generated when the actuators are electrically activated are overlaid along a stacking axis (S) and there is a force-coupling of the actuators over at least one coupling area (K) that is smaller than a projection area (P) of the actuator onto a plane (E) perpendicular to the stacking axis.

Abstract: An ultrasonic transducer and a method for producing an ultrasonic transducer are disclosed wherein the ultrasonic transducer has outstanding media resistance and a simpler construction by reducing the number of individual parts, so that the ultrasonic transducer can be produced in a fully-automated production process. The ultrasonic transducer, particularly for measurement of fluid volumes, can include a housing in which a contact element and a piezoceramic are arranged, wherein the piezoceramic includes two electrodes of differing polarity which are attached to different sides of the piezoceramic, wherein contact areas of the two electrodes for making electrical contact are disposed on a same side of the piezoceramic and the contact element includes at least two contact sections of differing polarity which are in electrically conducting contact with the contact areas of the two electrodes of corresponding polarity.

Abstract: The invention relates to a piezoceramic material with reduced lead content, based on potassium sodium niobate (PSN) and having a defined parent composition. According to the invention the manner of addition of a mixture of Pb, Nb and optionally Ag and optionally Mn gives a wide sintering range together with reproducible electrical and mechanical properties of the material.

Abstract: An actuator device (AV) including a main body (10) with a base body (10a) and a buildup body (10b) a plurality of actuators which are formed of actuator bodies comprising a piezoelectric or electrostrictive material and actuation electrodes and a printed circuit board (100) which extends in the longitudinal direction (X) of the actuator device (AV) over at least sections of actuator connection coatings, wherein conductive paths thereof are in electrical contact with the actuator connection coatings and wherein in the connection area segment (S0b, S1b, S2b, S3b) of the respective recess (S0, S1, S2, S3) at least in sections a connection layer (V) made of a resin reinforcement material with bismaleimide is disposed such that the connection layer (V) at least in sections contacts side surfaces (AS1, AS2) which respectively delimit a connection area segment (S0b, S1b, S2b, S3b) and which are opposed to each other.

Abstract: The disclosure relates to a piezoelectric drive, such as for permanently protected use in a moist environment, which includes a housing having a chamber, which chamber is hermetically sealed by at least one elastic membrane, and includes a piezoelectric drive unit in the hermetically sealed chamber for driving a drive element. The piezoelectric drive unit can include at least one piezoelectric bending actuator, which produces a bending deflection transversely to the elastic membrane when electrically activated. For example, two bending actuators can be arranged in series or parallel.

Abstract: The invention relates to a lead-free piezoceramic material based on bismuth sodium titanate (BST) having the following parent composition: x(Bi0.5Na0.5)TiO3-yBaTiO3-zSrTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0?z?0.07 or x(Bi0.5Na0.5)TiO3-yBaTiO3-zCaTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0<z?0.05 or x(Bi0.5Na0.5)TiO3-y(Bi0.5K0.5)TiO3-zBaTiO3 where x+y+z=1 and 0<x<1, 0<y<1, 0?z<1, characterized by addition of a phosphorus-containing material in a quantity that gives a phosphorus concentration of from 100 to 2000 ppm in the piezoceramic material.

Abstract: Actuator device has a main body with base and superstructure bodies, the device having a plurality of actuators formed from a piezoelectric or electrostrictive material and each extend from the base body and form the superstructure body. The actuators each have at least two inner actuating electrodes of which at least one first inner actuating electrode extends, in a positive depthwise direction from the front side up to a distance from the rear side, and of which at least one second inner actuating electrode extends in a negative depthwise direction from the rear side up to a distance from the front side. At least one first inner actuating electrode of each actuator is provided for electrical connection to a first connection pole of an actuating device, a rear-side layer which is formed from electrically conductive material arranged on the rear side of the actuator device.

Abstract: An actuator body, including a plurality of piezoceramic layers, separated from each other by a positive or negative internal electrode in alternation, positive and negative collecting electrodes, which are arranged on two outer faces of the actuator body and are conductively connected to the associated positive or negative internal electrodes, wherein the actuator body of the multilayer actuator has at least one positive and one negative contacting electrode, by which the multilayer actuator is electrically contacted and is conductively connected to the associated positive or negative collecting electrode, and the contacting electrodes are arranged in areas of the actuator body that are provided with a base metallization. The areas of the actuator body with a base metallization are spaced apart from each other and distances from the internal electrodes, wherein the distances are not less than the thickness of the piezoceramic layers in the active area of the multilayer actuator.

Abstract: The invention relates to a device for the production of a haptic feedback from keyless input units such as touchscreens or keypads in mobile IT devices such as mobile telephones, PDAs, music or multimedia players, cameras, navigation devices, etc. The market demands a device which can produce a haptic signal for a touchscreen such that the display is movable as a whole essentially perpendicular to the housing surface at least in one direction.

Abstract: The invention relates to an actuator body, comprising a plurality of piezoceramic layers, which are separated from each other by means of a positive or negative internal electrode in alternation, positive and negative collecting electrodes, which are arranged on two outer faces of the actuator body and are conductively connected to the associated positive or negative internal electrodes, wherein the actuator body of the multilayer actuator has at least one positive and one negative contacting electrode, by means of which the multilayer actuator is electrically contacted and which is conductively connected to the associated positive or negative collecting electrode, and the contacting electrodes are arranged in areas of the actuator body that are provided with a base metallization.

Abstract: The invention relates to a device for the production of a haptic feedback from keyless input units such as touchscreens or keypads in mobile IT devices such as mobile telephones, PDAs, music or multimedia players, cameras, navigation devices, etc. The market demands a device which can produce a haptic signal for a touchscreen such that the display is movable as a whole essentially perpendicular to the housing surface at least in one direction.

Abstract: The invention relates to a method for the production of a monolithic multilayer actuator, a corresponding monolithic multilayer actuator, as well as an external contact for a monolithic multilayer actuator. According to the invention specific microdisturbances are incorporated in the actuator structure along the longitudinal axis of the stack essentially parallel and spaced to the inner electrodes in the area of the at least two opposite outer surfaces to which the inner electrodes known per se are brought out, which at the earliest during polarisation of the actuator are subject to a pregiven, limited, stress-reducing growth into the interior and/or towards the outer electrode, wherein additionally the basic metallic coating and/or the external contact is formed elongation-resistant or elastic at least in the area of the microdisturbances.

Abstract: The invention relates to a method for the production of a monolithic multilayer actuator, a corresponding monolithic multilayer actuator, as well as an external contact for a monolithic multilayer actuator. According to the invention specific microdisturbances are incorporated in the actuator structure along the longitudinal axis of the stack essentially parallel and spaced to the inner electrodes in the area of the at least two opposite outer surfaces to which the inner electrodes known per se are brought out, which at the earliest during polarisation of the actuator are subject to a pregiven, limited, stress-reducing growth into the interior and/or towards the outer electrode, wherein additionally the basic metallic coating and/or the external contact is formed elongation-resistant or elastic at least in the area of the microdisturbances.

Abstract: A piezoelectric drive, especially a piezoelectric motor for producing continuous or stepwise movements, a friction element for such a piezoelectric drive as well as for transmission of forces between stator and rotor, and a circuit arrangement for operating a piezoelectric drive, especially a piezoelectric motor. An elastic double frame enclosing the transducer and having inner and outer frames is disposed at each outer node of the bending oscillation mode to hold the piezoelectric transducer and produce the pressing force of the friction element. The inner frame is joined to each of the longitudinal narrow sides of the transducer and the outer frame to the outer fastening. Further, the outer frame and inner frame are spaced apart and maintained in contact by stays or bridges.

Abstract: The invention relates to a piezoelectric drive, containing a driven element (1) fitted with a friction layer (2) and at least one solid-state plate-shaped piezoelectric transformer (6) as driving element. The length of the transform (L) does not match its width (H). First and second groups of electrodes (12, 13) are provided on the surfaces (7) of the transformer. The first and the second groups of electrodes have areas with identical configuration on the opposite large-surface metallized surfaces of the plate-shaped piezoelectric transformer. Each group of electrodes forms at least one independent transformer of the acoustic waves that are not coupled to one another and which propagate along the long side of the piezoelectric transformer. Hence, the first group of electrodes (12) operates as longitudinal wave generator (17) while the second group of electrodes (13) operates as flexural wave generator (18) of the acoustic waves.

Abstract: A piezoelectric motor achieves maximum mechanical performance, high safety of operation and low costs with a negligible exciting voltage. The piezoelectric engine has a stator whose oscillator designed as a closed waveguide is provided with at least one generator of an elastic travelling wave for the waveguide. A rotor is frictionally engaged by a functional surface of the oscillator. The elastic travelling wave generator is as long as the generated wavelength and consists of a base generator and two supplementary generators that generate elastic longitudinal stationary waves having the same amplitude and wavelength. The stationary waves are offset with respect to the wave generated by the base generator by .+-.1/3 of the wavelength along the waveguide. Exciting sources are associated with the base generator and the supplementary generators. The supplementary generators and their exciting sources are designed in such a way that the stationary waves they generate are phase shifted by .+-.2/3 .pi.