Patent ID: 9335609
Filing Date: 2016-05-10
CPC Classification: G02B,G03B

Claim Text:
1. A driving system for a shape memory alloy (SMA) based actuator having SMA wires, comprising: a capture module configured to capture a current position of a lens module from a position sensor; a determination module configured to calculate difference P a first drive module configured to rapidly increase the current applied to the SMA wires to rapidly contract the SMA wires to move the lens module to the target position when P a second drive module configured to rapidly decrease the current applied to the SMA wires to rapidly extend the SMA wires to move the lens module to the target position when P a third drive module configured to slowly increase the current applied to the SMA wires to slowly contract the SMA wires to move the lens module to the target position when 0<P a fourth drive module configured to slowly decrease the current applied to the SMA wires to slowly extend the SMA wires to move the lens module to the target position when −20 μm<P