Means for Compensating Facet Tilt on a Rotating Mirror Scanner
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Many optical display devices, printers, or scanning devices make use of a polygonal or polyhedral scanner bearing plane or contoured mirrors on each facet of the solid. For devices of high resolution, it has proved essentially impossible to fabricate the spinner with adequate uniformity of tilt of the individual facets. The tilt is shown as the angle alpha in the drawing. Nonuniformity then leads to a nonuniform spacing of the horizontal lines produced by the scanner, as they are displaced one from the other by a slower mirror for vertical scan or by the, slow motion of the photoreceptive material.