Abstract: The present disclosure refers to a scale element for an optical measuring device having an incremental encoder and an interferometric sensor system, the scale element having a reflection layer on one of the surfaces of the scale element, which reflection layer is provided to cooperate with the interferometric sensor system, and the scale element further having a material measure, which is arranged in a direction pointing away from and spaced apart from the reflection layer and is provided to cooperate with the incremental sensor system, the reflection layer being configured and designed in such a way that the reflection layer is transmissive for light of certain wavelengths and reflective for other wavelengths.

Abstract: A rotary ultrasonic motor includes an ultrasonic actuator, a driven element, an inner casing member and an outer casing member. A piezoelectric or electrostrictive or magnetostrictive material is arranged between an excitation electrode and at least one general electrode. The ultrasonic actuator is between the inner and outer casing members of a casing, and is directly or indirectly in contact with the element to be driven, so that periodic deformations generated in the ultrasonic actuator by electrical excitation are transferable to the drive element. The ultrasonic actuator is mounted by a retaining device arranged on the casing with at least one retaining section which engages in a recess associated with a respective retaining section.

Abstract: A method is disclosed for closed-loop motion control of an ultrasonic motor having at least one actuator with an excitation electrode and at least one common electrode, an element to be driven, a controller and at least one electrical generator for generating at least first and second excitation voltages U1 and U2 to be applied to the electrodes of the actuator for vibration of the actuator. A friction element of the actuator, due to its vibration, intermittently contacts the element to be driven with a driving force. The method includes providing the at least two excitation voltages U1 and U2 with different resemblance frequencies, a frequency difference deviating from a servo sampling frequency of the controller by 5 kHz at the most, and simultaneously applying the excitation voltages to the electrodes of the actuator.

Abstract: The disclosure relates to a joint, which has at least three degrees of rotational freedom, having a rigid carrier element and at least two elastically deformable joint elements formed on the carrier element in an overlapping arrangement, at least in sections. Each joint element can include two rod-shaped web portions arranged on the carrier element and extending therefrom which are arranged either converging or diverging relative to each other, and at their end facing away from the carrier element are connected to each other by way of a contact portion. Two web portions connected to each other extend in a first common plane and two other web portions connected to each other extend in a second common plane, and the first common plane and the second common plane intersect.

Abstract: An adjusting device includes a base body, at least two drive elements, and a movable platform. Each of the drive elements abuts against a lever transmission device to perform a defined adjustment motion relative to the base body as a tilting motion about an axis through the platform and/or a translational motion parallel to an axis perpendicular to a platform plane. Joint elements allow for a tilting motion of the platform solely about the tilting axis. A spring element counteracts a parasitic translational motion in the platform plane and/or a parasitic rotatory motion of the platform about an axis of rotation arranged perpendicular to the platform plane due to the adjustment motion.

Abstract: The invention comprises a piezo motor with a U-shaped housing lower part and a mounted cover. The piezo actuator is mounted between two clamping jaws. Planar guide tracks are formed in the housing lower part to both sides of the piezo actuator. Bearing elements of circular cross-section are arranged between the clamping jaws and the guide tracks. Thrust pieces are braced between the housing cover and the bearing elements, which thrust pieces press the bearing elements against the clamping jaws. Here, the thrust pieces together with the guide tracks of the housing lower part form V-shaped guides.

Abstract: Method for operating an ultrasonic motor with an ultrasonic actuator formed as a plate and an electrical excitation device. The ultrasonic actuator has at least four identical volume regions arranged symmetrically in relation to a transverse plane and in relation to a longitudinal plane, each volume region forming acoustic standing waves and static bending deformations. The electrical excitation device provides at least one electric alternating voltage and two static electric voltages the at least one alternating voltage U1 being applied in a dynamic operating mode simultaneously to two of the generators for forming an acoustic standing wave in the ultrasonic actuator, and the two static electric voltages being applied in a static operating mode simultaneously to all generators for forming a static bending deformation of the ultrasonic actuator.