Abstract: In an embodiment a haptic device includes a movable surface, an actuator configured to move the movable surface and a resilient abutment, wherein the actuator is arranged between the movable surface and the resilient abutment, and is configured such that when a force acts on the movable surface, a stiffness of the actuator has a first stiffness value below a first force value and a greater stiffness value above the first force value, and wherein a spring constant of the resilient abutment has a value, which lies between the first stiffness value and a second stiffness value.

Abstract: The present invention relates to an actuator unit which is designed to generate a haptic signal, having a piezoelectric actuator which is designed to change its extent in a longitudinal direction as a function of an electrical voltage, a mechanical amplifier which is designed to amplify the haptic signal by converting the change in extent of the piezoelectric actuator into a movement of the actuator unit, wherein the movement occurs in the longitudinal direction, and the movement of the actuator unit occurs over a distance which is longer than the change in extent of the piezoelectric actuator, and the longitudinal direction is the direction in which an extent of the piezoelectric actuator is largest.

Abstract: In an embodiment a device includes a piezoelectric multilayer element having a top surface and being configured to change its extension in a first direction in response to an applied voltage, a mechanical amplifying element having an end portion fixed to the top surface of the piezoelectric multilayer element and an active portion movable relative to the piezoelectric multilayer element, wherein the mechanical amplifying element is configured such that the active portion is movable in a second direction perpendicular to the first direction when an extension of the piezoelectric multilayer element changes, the second direction being parallel to a surface normal of the top surface and a mechanical stop limiting a distance by which the active portion is movable towards the top surface.

Abstract: A device and a method are disclosed. In an embodiment, a device includes an oscillating body on which a piezoelectric element is fixed by a solder joint.

Abstract: The present invention relates to an actuator unit which is designed to generate a haptic signal, having a piezoelectric actuator which is designed to change its extent in a longitudinal direction as a function of an electrical voltage, a mechanical amplifier which is designed to amplify the haptic signal by converting the change in extent of the piezoelectric actuator into a movement of the actuator unit, wherein the movement occurs in the longitudinal direction, and the movement of the actuator unit occurs over a distance which is longer than the change in extent of the piezoelectric actuator, and the longitudinal direction is the direction in which an extent of the piezoelectric actuator is largest.

Abstract: To obtain large, high-quality crystals of a metal orthophosphate, in particular GaPO4 or AlPO4, from a nutrient solution with the use of seeds, a seed crystal is used having at least two rod- or wafer-shaped legs which form an angle with each other and define a main growth region, and which are positioned eccentrically in the single crystal grown. Contagious faces of two seed legs, which have been chosen for crystal growing, enclose an angle <180°. In this way the yield of the high-quality crystal region will be increased.