An electrophotographic printer includes an exposure unit having a MEMS
scanner operable to scan a beam of light across a photoconductor. The
MEMS scanner includes a mirror having an aspect ratio similar to the
shape of the facets of a conventional rotating polygon scanner. In a
preferred embodiment, the scan mirror has a length of about 750 microns
in a dimension parallel to its axis of rotation and a length of about 8
millimeters in a dimension perpendicular to its axis of rotation. The
MEMS scanner is operable to scan at a frequency of about 5 KHz and an
angular displacement of about 20 degrees zero-to-peak mechanical scan
angle.