Patent ID: 7869112

Claim:
A scanning beam system, comprising: an optical module operable to produce a plurality of optical beams modulated to carry images to scan over a surface to produce the images on the surface based on a two dimensional scanning pattern, wherein the optical module comprises: a polygon scanner positioned in optical paths of the optical beams and comprising a rotation axis around which the polygon scanner rotates to scan the optical beams horizontally on the surface, a plurality of polygon facets that are sized to simultaneously receive the optical beams and comprise a plurality of reflective polygon facets are tilted with respect to the rotation axis at different facet tilt angles, respectively, to scan the optical beams horizontally at different vertical positions on the surface, respectively; a vertical adjuster placed in the optical paths of the optical beams to control and adjust vertical positions of the optical beams on the surface; and a control unit that controls the vertical adjuster at a fixed position to place the optical beams at respective fixed vertical positions on the surface when the polygons scanner horizontally scans the optical beams to produce parallel horizontal lines on the surface.