Abstract: A driving-unit operation method includes: generating pulse blocks on the basis of driving pulses; and modifying a driving signal in accordance with a position error signal. In the modifying the driving signal, when the position error signal is in a first range, the shape of the driving pulses is modified so as to form a first driving-pulse shape, and the pulse-block duty cycle is set to a first pulse-block duty cycle value, whereas when the position error signal is in a second range, the shape of the driving pulses is modified so as to form a second driving-pulse shape, and the pulse-block duty cycle is set to a second pulse-block duty cycle value.

Abstract: A lens driving device includes: a movable part for accommodating a lens; and an ultrasonic motor having a resonance part configured to move the movable part by motion of the resonance part of the ultrasonic motor. The resonance part has a pair of arms, and is disposed such that only one of the arms is in contact with the movable part.

Abstract: A lens driving device, a camera module, and a camera-mounted device are provided, which are capable of reducing the effect of external magnetism and of being reduced in size and profile thereof. The lens driving device includes an AF driving part configured to move, with respect to an AF fixing part, an AF movable part in a Z-direction extending along an optical axis, and an OIS driving part configured to move, with respect to an OIS fixing part, an OIS movable part in an X-direction and a Y direction each orthogonal to optical axis. The OIS driving part and the AF driving part are each composed of an ultrasonic motor. In a rectangle defined by two sides where the OIS driving part is disposed, the AF driving part is disposed along a side different from the two sides.

Abstract: The piezoelectric motor (6) comprises a stator (1) and a runner (4) which form a gap (7) as well as comprising a piezoelectric transducer (3) which is connected to the stator (1) or the runner (4) and which with the stator (1) or the runner (4) forms a resonator (1,3;4,3), wherein the resonator (1,3; 4,3) may be excited in a main oscillation direction (H), characterised in that the stator (1) comprises an engagement surface (1a) facing the runner (4), or the runner (4) an engagement surface which faces the stator (1), and that the stator (1) or the runner (4) comprises an elastic advance element (5) which bridges the gap (7) between the stator (1) and the runner (4) in a manner such that the advance element (5) at least temporarily lies on the engagement surface (1a). The advance element (5) comprises a first part-section (5c) as well as a second part-section (5d), wherein the part-sections (5c, 5d) have a different resonant frequency.