Patent ID: 7882701
Filing Date: 2011-02-08
Classification: F03G,H02K,H02N

Abstract:
1. A high-bandwidth micro electro-mechanical system (MEMS) actuation system comprising: a stage; at least two actuator pairs coupled in parallel to said stage; said actuator pairs each including at least first and second controlled input bi-directional semiconductor actuators; said actuators each being energizable to move in a drive direction against a bias from a rest position to an energized position, and each being movable by the bias to the rest position upon deenergization, wherein movement from the rest position to the energized position and back to the rest position defines an actuation cycle; said actuators being asymmetric, wherein a maximum energization frequency of movement from the rest to the energized positions is greater than a maximum bias frequency of movement from the energized to the rest positions; said first and second actuators being opposably coupled to one another, wherein drive directions of said actuators oppose one another; a pulse generator coupled to said actuators of each actuator pair; said pulse generator configured to alternately transmit energization pulses to said actuators of each actuator pair at an alternation frequency greater than said bias frequency of movement; said pulse generator configured to transmit said energization pulses to each of said actuator pairs sequentially at a sequence frequency greater than a frequency of said actuation cycle; wherein said actuators are each movable from their energized positions to their rest positions at a frequency greater than said bias frequency of movement, said actuator pairs are sequentially energizable at a sequence frequency greater than said cycle frequency, and said stage is movable in a single degree of freedom at a bandwidth of at least four times said cycle frequency.