Patent ID: 8582191

Claim:
An actuator device, comprising: a support base; a first flexure including a first flexure base that is fixed to the support base and first flexure extensions that flex with respect to the fixed first flexure base and the support base; a second flexure including a second flexure base that is fixed to the support base and one or more second flexure extensions that flex with respect to the fixed second flexure base and the support base, the second flexure positioned and oriented to have the first and second flexure extensions to cross; an actuator engaged to distal ends of the first and second flexure extensions to rotate around a single rotation axis as the first and second flexure extensions deform when the actuator is actuated to rotate, the actuator being electrically coupled to the first flexure extension to receive an electrical actuator drive signal through the first flexure extension to cause the actuator to rotate or to be positioned at a desired position; a platform fixed to the actuator and to move with the actuator, the platform including a first side grating facet that has electrically conductive first grating teeth that are electrically connected to one another; a side grating module fixed to the support base and separated from the platform and the actuator so that the platform and the actuator can move relative to the side grating module, the side grating module includes a second side grating facet that has electrically conductive second grating teeth that are electrically connected to one another and positioned adjacent to the first grating teeth and separated from the first grating teeth by a gap; a position sensing circuit coupled to the first grating teeth and the second grating teeth to apply an electrical sensor signal, the position sensing circuit including a processing circuit that receives first and second electrical signals from the first and second grating teeth, respectively, and produces a position signal from the received first and second electrical signals indicating a relative position of the platform relative to the side grating module; and a servo control circuit coupled to the position sensing circuit and the actuator, the servo control circuit operable to produce a servo control signal based on the position signal and operable to control the actuator based on the position signal.