Scanning systems with polygon scanner having curved facets
AssigneeXerox Corporation
InventorHarry P. Brueggemann
Life of this patent
Estimating the term…
Abstract
A raster scanner system having double reflection from polygon facet surfaces which have aspheric curvature. In addition to providing a scan which is free of astigmatism and bow, the aspheric surfaces provide the scan and focus functions of conventional scan lens optics.
Claims5
In a light scanning system including a multi-surface mirror assembly having an axis of rotation, including a light source for introducing a source of light toward said multi-surface mirror assembly, said light being reflected in turn by each of said surfaces of said mirror assembly, a first fixed mirror placed in the path of said reflected light from said multi-surface mirror assembly, a second fixed mirror placed in the path of said reflected light from said first mirror, said second mirror reflecting said light back to the same surface of said rotating multi-surface mirror assembly for a last reflection, said last reflection being a scanning light beam of predetermined range of arc of one rotation of said multi-surface mirror assembly, the improvement comprising said multi-surface mirror assembly comprising a polygonal array of non-planar mirror facets, said mirror facets having a predetermined draft angle with respect to the axis of rotation of said multi-surface mirror assembly.
In a light scanning system a multi-surface mirror assembly having an axis of rotation, including a light source for introducing a source of light toward said multi-surface mirror assembly, said light being reflected in turn by each of said surfaces of said mirror assembly, a first fixed mirror placed in the path of said reflected light from said multi-surface mirror assembly, a second fixed mirror placed in the path of said reflected light from said first mirror, said second mirror reflecting said light back to the same surface of said rotating multi-surface mirror assembly for a last reflection, said last reflection being a scanning light beam of predetermined range of arc of one rotation of said multi-surface mirror assembly, the improvement comprising said multi-surface mirror assembly comprising a polygonal array of mirror facets having aspheric surfaces, said mirror facets having a predetermined draft angle with respect to the axis of rotation of said multi-surface mirror assembly.
Dependencies are inferred from the claim text.