Optics for passive scan angle doubling
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United States of America Patent
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-
Feb 13, 1996
Grant Date -
N/A
app pub date -
Dec 19, 1994
filing date -
Dec 19, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scan angle doubling 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 means are coincident.
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