DRIVE DEVICE, LENS BARREL, IMAGING DEVICE, LENS DRIVE METHOD, AND METHOD OF PRODUCING SHAPE MEMORY ALLOY

摘要

A small sized, low cost drive device capable of accurately stopping a lens group at a desired position by a simple structure and suitably incorporated in a portable terminal etc. The drive device has an electricity conduction control means for controlling the amount of electricity supplied to a shape memory alloy and also has a detection means for detecting whether the lens group has started to move. The amount of movement of the lens group in the optical axis direction is controlled based on the amount of electricity supply when the detection means detects the movement of the lens group.