A camera module according to an embodiment includes a camera housing, a lens assembly including a lens, at least a portion of the lens assembly is disposed in the camera housing, a first carrier to which the lens assembly is coupled and that is movable relative to the camera housing in a direction of an optical axis of the lens, a second carrier on which the first carrier is coupled and that is movable relative to the camera housing in one or more directions perpendicular to the optical axis, a first piezoelectric motor that is connected to the first carrier and the second carrier and that provides a first driving force to move the first carrier in the direction of the optical axis, and a second piezoelectric motor that is connected to the camera housing and the second carrier and that provides a second driving force to move the second carrier in the one or more directions perpendicular to the optical axis.

A composite panel includes a matrix, actuator elements disposed within the matrix or secured to an exterior surface of the composite panel, a plurality of slits, and an electrical termination area coupled to the shape memory fibers/elements. The plurality of slits are arranged parallel to each other and extend through at least a portion of a thickness of the composite panel. A power supply is configured to apply a burst voltage to the shape memory fibers/elements to change a shape of the composite panel, thereby modifying an airflow extending across the composite panel during operation.

A sound generator includes a piezoelectric device, a first weight member disposed at a first portion of the piezoelectric device, a second weight member disposed at a second portion of the piezoelectric device, a first elastic member disposed at a third portion between the first portion and the second portion of the piezoelectric device, and a protection member configured to cover the piezoelectric device, the first weight member, the second weight member, and the first elastic member.