Patent ID: 7321458

Claim:
A system for controlling optical dithering comprising: an actuator operable to repeatedly position an optical dithering element approximately between first and second positions; a position sensor operable to sense the position of the optical dithering element at a plurality of sample times, and to generate a position error indicator signal for each of the plurality of sample times, the position error indicator signal having a first value responsive to the sensed position exceeding a desired setpoint for the position of the optical element, and having a second value responsive to the sensed position falling below the desired setpoint; and a controller, coupled to the position sensor, the controller operable to generate a generally periodic waveform for controlling the actuator, operable to generate an error signature for a period of the waveform based on a plurality of the position error indicator signals generated by the position sensor for that period, and operable to modify the waveform for a later period of the waveform in response to the error signature.