Patent ID: 7421308
Filing Date: 2008-09-02
Classification: G06K

Abstract:
1. A limited rotation motor optical scanning system comprising: a limited rotation motor scanner element adapted for directing an energy beam to at least one location within a field of view; a digital controlled servo system adapted for controlling motion of the limited rotation motor scanner element in accordance with a servo command waveform; a position feedback unit for providing a position feedback signal indicative of a rotational position of said limited rotation motor scanner element; a wide angle compensation unit for receiving said position feedback signal and for providing a boost signal that is representative of a boost factor that compensates for torque constant variation with the rotational position of said limited rotation motor scanner element; a digital processor for providing a set of control parameters for use during the command waveform in conformance with which said command waveform will be employed to control motion of the limited rotation motor scanner element; and an adjustment unit for providing an adjusted output signal responsive to said control parameters and responsive to said boost signal to control the motion of the limited rotation motor scanner element while compensating for torque constant variation with the rotational position of said limited rotation motor scanner element during the command waveform.