A shape memory alloy (SMA) actuator includes a groove formed in a surface of a shape memory alloy (SMA) substrate establishing a trace pattern for a layer of conductive material formed over an electrically insulative layer. The trace pattern includes a first end, a second end, and a heating element disposed...http://www.google.co.uk/patents/US7658709?utm_source=gb-gplus-sharePatent US7658709 - Shape memory alloy actuators
