Designed to move the lens above an image sensor, the actuator uses eight shape memory wires.
The wires contract when heated by current passing through them – CML has its own control algorithm firmware and a controller chip, the CM824, which provides feedback by deducing wire length from wire resistance.
There are in four crossed-pairs of wires (see diagram), one pair on each side of a square between a fixed part and a moving part – the latter carrying the lens. In the diagram, the right hand corner post is fixed (as is its diagonal opposite, while the left post (and its opposite) moves with the lens. This system can also steer the lens in pitch and yaw.
The eight-wire actuator product page has a video showing how it works