Patent ID: 7307650

Claim:
An arrangement for reducing image distortion in a projected image, comprising: a) a light source for generating a light beam; b) a pair of oscillatable scan mirrors; c) a drive assembly for oscillating the scan mirrors about mutually orthogonal axes to form a raster pattern of scan lines on a projection surface, each scan line having a number of pixels, the drive assembly including a drive energized by a supply line frequency and operable at a drive frequency for moving one of the scan mirrors in one circumferential direction about one of the axes at a substantially constant drive speed, the one scan mirror being returnable at a resonant frequency in an opposite circumferential direction about the one axis at a return speed greater than the drive speed; d) a controller for causing selected pixels in the scan lines to be illuminated, and rendered visible, by the laser beam to form the image on the projection surface; and e) means for adjusting the resonant frequency to be non-harmonically related to the drive frequency and the supply line frequency to reduce electrical interference between the resonant, drive and supply line frequencies and to resist image distortion.