Abstract
This paper restricts to the study of the effect of vignetting of dual beam scanning of polygonal scanners. The scanning of dual beam scanning field of a polygon scanner is not symmetric around any points or axes in the scanning system when the incident ray has an incident angle (theta) z. Therefore, in general, a symmetrical scan field distribution cannot be expected. In this paper, some fundamental aspects of the structure of the scan field, such as the effective scanning height of polygon, effect of vignetting and the scan duty cycle in y' direction are considered. The vignetting effect in z' directions are also analyzed and the condition of the vignetting free is given. From discussion, we can conclude that to educe the processing area of polygon facet, the condition of (theta) y < arcsin(RF/(chi) 0) is needed.© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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