Polygon scanner with predictable facet deformation...

Details Polygon scanner with predictable facet deformation... Polygon scanner with predictable facet deformation...

G - Physics

02

B

88/96.8

G02B 26/12 (2006.01) G02B 5/09 (2006.01)

Patent

CA 2037858

Polygon scanners of the type used in ROS printers, are subject to centrifugal caused distortion at the mirror (facet) surface at certain rotational speeds. This distortion can affect the performance of the scanning beam at an image plane. Techniques are provided for predicting the radial facet dlstortion at expected rotational speeds, and for specific polygon designs. In one embodiment, the surfaces of the polygon facets are modified to incorporate the reverse of the radial distortion curve which is predicted at the rotational load. When operating at the rotational load, the facet surface then deforms to a desired planar (flat) configuration. In another embodiment, the polygon element structure is modified by adjusting the polygon modules of elasticity, weight density, and the polygon continuum to achieve a distorted facet surface at rotational speed which provides the functions normally provided by a post polygon lens.

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