Abstract

Perhaps the most common lens arrangement used in conjunction with laser scanning is a beam expander, one or two scan mirrors, then an image forming lens group designed for anterior aperture stop. The numerical aperture ranges from ~0.03 for typesetting to ~0.25 for circuit board trimming. The system has inverse vignetting, image mapping is usually F/theta or F/sin(theta), telecentricity may or may not be specified, and it may or may not be achromatized. A line image perpendicular to the scan direction may or may not be required at the scan mirror. Another family uses acoustooptical scan elements. The design problem there is to create a ray-trace model to verify performance and especially to compute assembly tolerances. (Invited paper, 25 min)

© 1986 Optical Society of America