Rotating polygon scanner with double reflection from each facet

Abstract

Abstract A rotating polygon scanner includes a rotatable, multi-surface mirror assembly (12), said surfaces having a predetermined draft angle (D.A.) with the axis of rotation of said assembly. A source (10) of infinite conjugate light directs the light (RAY 1) towards the multi-surface mirror assembly, the light being reflected in turn by each active surface (22) of the mirror assembly. A first mirror (18) having optical power is placed in the path of light (RAY 2) reflected from the active surface of the multi-surface mirror assembly, and a second mirror (20) having optical power is placed in the path of the reflected light (RAY 3) from the first mirror, the second mirror (20) reflects the light (RAY 4) back to the active surface (22) of the multi-surface mirror assembly for reflection toward a surface (24) to be scanned, the scanning light beam (RAY 5) having no wobble effects and reduced bow effects, and being focussed at the surface to be scanned. In addition to their wobble correction function, the optical powered mirrors provide the scan and focus functions of conventional f-6 scan lens optics and hence such f-0 scan lens optics can be eliminated from the scanner system, thereby providing an all mirror scanner system.

Inventors

• 👤 Harry P. Brueggemann

Bibliographic Details