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Proceedings Paper

Center-of-scan locus of an oscillating or rotating mirror
Author(s): Gerald F. Marshall
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Paper Abstract

Reflective scanning devices have plane mirrors that deflect a light beam. When the mirror surface is coincident with the axis of rotation and when the incident beam passes through the axis of rotation, the instantaneous center-of-scan (ICS) is a single point for all angular positions of the mirror. If these two conditions are not met, the ICS moves with respect to the rotational axis and is, therefore, a locus. This paper illustrates the ICS for a six-facet and a twelve-facet prismatic polygonal scanner, and the relationship between the limiting off-set angle of the incident beam to the scan axis and the number of facets. This paper also illustrates the relationship between the range of the off-set angles of the incident beam from the scan axis and the number of facets. These aspects provide useful insights for consideration when undertaking the system design or detail design of an optical scanning system.

Paper Details

Date Published: 29 December 1993
PDF: 12 pages
Proc. SPIE 1987, Recording Systems: High-Resolution Cameras and Recording Devices and Laser Scanning and Recording Systems, (29 December 1993); doi: 10.1117/12.165197
Show Author Affiliations
Gerald F. Marshall, Consultant in Optics (United States)


Published in SPIE Proceedings Vol. 1987:
Recording Systems: High-Resolution Cameras and Recording Devices and Laser Scanning and Recording Systems
Leo Beiser; Reimar K. Lenz, Editor(s)

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