Abstract: An optical element driving device includes a fixed body, a movable body, a driving part that converts vibration motion of a piezoelectric element into linear motion for driving the movable body, a drive control part that applies a drive signal to the driving part, a drive detection part that detects the drive state of the driving part, and a temperature measurement part that measures an ambient temperature. The drive control part determines whether or not a drive error of the driving part occurs from the information detected by the drive detection part. When the drive error occurs, drive control part compares an ambient temperature associated with the current drive frequency with the current ambient temperature measured by the temperature measurement part, corrects the drive frequency according to the comparison result, and stores the corrected drive frequency and the current ambient temperature in association with each other.

Abstract: The driving unit includes: a first contact portion and a second contact portion that move relatively to each other while making contact with each other during driving; in which the second contact portion includes a coating layer at a contact face with the first contact portion, and the first contact portion and the second contact portion generate heat along with relative movement to vaporize a worn-away part of the coating layer.

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 drive device is provided with a first fixed part, a first movable part, a first supporting part, and a Z-direction drive unit which moves the first movable section in an optical axis direction (the Z-direction) relative to the first fixed part and is constituted by an ultrasonic motor that converts vibration motion into rotational motion. The lens drive device further has a rotating body which rotates around the optical axis in response to rotational motion of the Z-direction drive unit, and a mechanical element which converts the rotational motion of the rotating body into linear motion in the optical axis direction, the first movable part being moved in the optical axis direction by rotation of the rotating body.

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: The driving unit includes: a first contact portion and a second contact portion that move relatively to each other while making contact with each other during driving; in which the second contact portion includes a coating layer at a contact face with the first contact portion, and the first contact portion and the second contact portion generate heat along with relative movement to vaporize a worn-away part of the coating layer.

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.