| 摘要 |
A device for moving an optical element along an axis includes a housing in which is mounted a magnet assembly. The magnet assembly has an axial bore therethrough. An electrically conductive coil assembly has an axial bore therethrough substantially concentric with the magnet assembly's bore. The coil assembly is mounted at least partially within the magnet assembly bore for limited axial movement relative thereto. The coil assembly is placeable in electrical communication with a power source, and can support an optical element within the coil assembly's bore. A sensor is affixed for movement with the coil assembly that is adapted for sensing an axial position of the coil assembly. The sensor is placeable in signal communication with a current source for adjusting current delivered to the coil assembly based upon the sensed axial position. |
