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Abstract

A passive facet tracking scan angle doubling system using passive optical components to induce a beam of light to track a facet of a rotating mirror polygon and to increase the scanning angle available from a rotating mirror polygon of a given size. The passive facet tracking portion of the system using passive optical components to induce a beam of light to track a facet of a rotating mirror polygon. The properties of the passive components are such that they collimate a light beam in a tangential plane in a complete trip through the passive optical components and the passive optical components focus the beam in the sagittal plane so that the beam is collimated in the tangential plane and focussed in the sagittal plane when it arrives at the center of the flat facet. The scan angle doubling portion of the system using a rotating mirror polygon, a cylinder mirror, and a lens to increase the scanning angle available from a rotating mirror polygon of a given size. The properties of the passive components are such that the output light beam from the rotating mirror polygon is collimated and normal to the rotating mirror polygon. The polygon, cylinder mirror, and lens are arranged such that the rotating polygon and the cylinder mirror are opposed to each other and separated by a distance greater than the sum of the radius of curvature of the cylinder mirror plus the focal length of the lens, and the lens is interposed between the rotating polygon and the cylinder mirror so that the center of the radius of curvature of the cylinder mirror and the focal point of the lens are coincident.

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