The present disclosure relates to a linear drive, including: an actuator unit with at least one actuator; two guide elements and a movement element, wherein the movement element is displaceable along both guide elements by a movement generated by the actuator unit as a result of a stick-slip effect. In order to allow a more accurate displacement of the movement element in a compact design of the linear drive, the movement element can be brought into engagement with each of the two guide elements by static friction in order to be displaced along the two guide elements as a result of the stick-slip effect.

A lens driving device includes a lens holding portion, a driving shaft, a vibration member, and a spring member. The vibration member is connected to one end of the driving shaft and causes the driving shaft to micro-vibrate. The spring member is fixed to the lens holding portion and includes a grip portion that sandwiches and grasps the driving shaft. Extension piece portions that protrude while being bent so as to be separated from the driving shaft are provided at end sides of the grip portion in an axial direction of the driving shaft.

An optical element driving mechanism is provided. The optical element driving mechanism includes a movable portion, a fixed portion, a driving assembly, and a stopping assembly. The movable portion is used for connecting to an optical element having a main axis. The movable portion is movable relative to the fixed portion. The driving assembly is disposed on the fixed portion or the movable portion to move the movable portion relative to the fixed portion. The stopping assembly connects to the movable portion and the fixed portion to limit the range of motion of the movable portion relative to the fixed portion.

Disclosed is a piezoelectric inertial drive stage including a piezoelectric inertial driver, a slider and a holder. The driver includes a mounting portion for the mounting on the holder, a friction portion coupling to the slider, a flexure portion between the mounting portion and friction portion, a piezoelectric element with a first end bonded to the mounting portion and a second end bonded to a movement portion, the movement portion transferring the motion of the piezoelectric element to the friction portion to drive the slider.

The present disclosure relates to a piezoelectric stick-slip-motor and control method. An exemplary method to enable speed variation of the piezoelectric stick-slip-motor with a reduced noise generation, includes: applying a cyclic sawtooth-waveform drive voltage signal with a constant frequency in which the drive voltage (V) increases to and decreases from a peak voltage (Vp) for operating the motor with a constant speed; and changing the motor speed by gradually increasing or decreasing the gradient (dV/dt) of increasing the drive voltage (V) to the peak voltage (Vp) with each subsequent sawtooth-waveform drive voltage signal cycle (C) while keeping the frequency of the drive voltage signal constant.

A stick-slip piezo motor. At least one voltage source is connected to a piezo motor. The piezo motor has at least one oscillating piezo element and at least one moving friction element connected to the oscillating piezo element. The moving friction element moves in a desired travel direction. A computer is programmed to control the voltage source to deliver voltage to the piezo motor at a predetermined frequency and amplitude to control the speed of the piezo motor. The computer is programmed to hold the frequency constant while varying the amplitude to adjust the speed of the piezo motor. In a preferred embodiment the computer is programmed to hold the frequency constant at an ultrasonic frequency. In another preferred embodiment the computer is programmed to hold the frequency constant at a value of 15 kHz or higher.

A method is provided of controlling at least two interacting piezoelectric actuators for commonly displacing an object attached thereto. The method comprises the following steps: a. Step A: applying a first cyclic drive voltage signal with a constant frequency to the first piezoelectric actuator, b. Step B: applying a second cyclic drive voltage signal with a constant frequency to said second piezoelectric actuator, whereby the frequencies of the first and second cyclic drive voltage signals are substantially identical and whereby the frequencies of the first and second cyclic drive voltage signals are substantially oppositely phased, and in which at least in a predetermined time period the cyclic drive voltage signals in step A and B are synchronized such that at least one time phase is comprised in which the drive voltage signals of the first and second piezoelectric actuators have both a gradient of decreasing or increasing the respective drive voltage signal having the same sign or one of these gradients is zero and the other is not zero.

An optical element driving mechanism is provided, including a fixed portion, a movable portion, a driving assembly, and a stopping assembly. The movable portion is movably connected to the fixed portion, wherein the movable portion is used for connecting to an optical element having a main axis. The driving assembly is disposed on the fixed portion or the movable portion, and the driving assembly is used for driving the movable portion to move relative to the fixed portion. The stopping assembly is connected to the movable portion and the fixed portion.

The present disclosure relates to the technical field of mechanical precision manufacturing, in particular to a motor tracking error reduction method and an implementation device based on a micro-drive unit. A motor tracking error reduction method based on micro-drive unit includes: providing a motor mover as the working output end, and feeding back the position information of the motor mover to the micro-drive controller in real time by the sensor; controlling the micro-drive unit to compensate the displacement of the motor mover by the micro-drive controller; correcting the tracking error of the motor mover after the displacement compensation, and feeding back the tracking error information after correction to the motor controller. The error reduction method and implementation device in the present disclosure reduce the motor tracking error and solve the problem of coupling interference. In addition, the single position feedback is used to reduce the production cost.

Disclosed is a stick-slip drive comprising a base and a rotor which are in contact with one another via a friction surface and are coupled to one another in such a way that the rotor can perform an inertial motion relative to the base, characterized in that two materials, a noble metal and a ceramic material, are paired up on the friction surface between the base and the rotor.