Patent ID: 8885239

Claim:
An apparatus comprising: a light source operable to produce a linear array of two or more concurrent light beams in respective parallel beam directions; an optical element having an optical axis parallel to the beam directions and configured to anamorphically magnify the light beams with different magnification in a vertical direction relative to a direction along a second axis substantially in a plane formed by the vertical direction and the optical axis; an adjustment mechanism coupled to the optical element to selectively rotate the optical element either around an axis substantially in the vertical direction, the optical axis, the second axis, or combinations of axes thereof to adjust vertical separation between two or more spots respectively formed on a surface by the two or more light beams after being anamorphically magnified by the optical element; an optical sensor to capture images of the two or more spots formed on the surface; and a controller to determine a vertical separation between the two or more light beams based on the captured images and to control the adjustment mechanism to adjust the vertical separation between the two or more spots formed on the surface based on the determined vertical separation.