Patent ID: 6061163
Filing Date: 2000-05-09
Classification: G01P,G02B,Y10S

Abstract:
An optical resonant scanner, comprising:a reflective surface for deflecting light, the reflective surface alternately rotating about an axis of rotation in a first direction and a second direction, wherein the rotation in the first direction occurs between a first extreme rotational position and a second extreme rotational position, and wherein the rotation in the second direction occurs between the second extreme rotational position and the first extreme rotational position;a first sensor which generates a first output signal in response to motion of the reflective surface at a first position of the reflective surface;a second sensor which generates a second output signal in response to motion of the reflective surface at a second position of the reflective surface;means for differencing the first output signal and second output signal to factor out common motion at the first position and second position.