Patent ID: 6037583
Filing Date: 2000-03-14
Classification: G02B

Abstract:
A control system for a scanner drive comprising:an oscillating motor for driving an oscillating mirror for providing linearly oscillating deflection of a beam bundle;a control unit for supplying the oscillating motor with exciting current which is variable with respect to the control frequency, triangular wave and amplitude;a function generator being connected with the control unit;a measurement value transducer for obtaining a sequence of information about the deflection positions of the oscillating mirror; anda logic unit connecting the measurement value transducer with the function generator for determining correction values for the exciting current, the logic unit determining the values of k.sub.1 . . . k.sub.n and .phi..sub.1 . . . .phi..sub.n for the Fourier frequencies in the following series:y=4/.pi.* [k.sub.1 sin(x+.phi..sub.1)-k.sub.2 sin(3x+.phi..sub.2)/3.sup.2 +k.sub.3 sin(5x+.phi..sub.3)/5.sup.2 . . . -+ . . .], where k.sub.1 to k.sub.n represent the correction factors x represents the deflection angle, and .phi..sub.1 to .phi..sub.n represent the phase angles.