Patent ID: 6845190

Claim:
A controller for an optical scanner that is driven to move in a desired pattern, comprising: (a) a first reference phase signal source that produces a reference phase signal; (b) a first phase control that is adapted to couple to a sensor to receive a position signal indicative of a position of a moving portion of the optical scanner and to the first reference phase signal source to receive the reference phase signal, said first phase control using the reference phase signal and the position signal to produce a phase signal output; (c) a first amplitude reference source that produces an amplitude reference signal; and (d) a first amplitude control that is adapted to couple to a sensor to receive the position signal and to the first amplitude reference signal source to receive the amplitude reference signal, said first amplitude control producing an amplitude signal output in response to the position signal and the amplitude reference signal, wherein the phase signal output and the amplitude signal output are combined to control a drive signal used to drive the optical scanner to move in the desired pattern.