Thermo-mechanical stabilization of nitinol wire in optical image stabilized suspension

摘要

Method and system for stabilizing the properties of an SMA wire in an optical image stabilization (OIS) suspension of the type having a first or support member and a second or movable member connected to each other by shape memory alloy (SMA) wires Is disclosed. Embodiments of the method include periodically and mechanically distorting the wire by moving the moveable member and the support member relative to one another while applying heat to the wire. Temperature, strain, and de-strain levels are configured to cause the wire to periodically transition between austenitic and martensitic phases when subjected to mechanical strain and de-strain. [Selected figure] Figure 1