Proceedings PaperA Variable Focus, Single Lens, 3 CRT Dichroic Color Graphics Projector
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A new lens design, featuring user variable focus adjustment, has been incorporated into a raster scanned 3 CRT graphics and video projector. Since registration is accomplished internally in the crossed dichroic single lens design, good color convergence and focus can be maintained over a large projected image range of 6 to 12 feet diagonal. Field curvature and focus tilt compensation is separately adjustable for optimum focus on curved or flat screens at various projection angles.