OPTICAL SCANNER AND IMAGE FORMING DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an optical scanner that easily verifies a surface shape of a scanning lens.

SOLUTION: The optical scanner has a scanning lens 105 including at least one rotationally asymmetric refractive surface R and imaging a light flux deflection-scanned by an MEMS mirror on a scanned surface. On the refractive surface R, a main line P connecting tips of sub lines of the refractive surface R is curved in a sub-scanning direction, and a sub-scanning cross section R1 parallel with the surface formed by an optical axis from a light source to the scanned surface and a sub-scanning axis has an elliptical shape. An extreme value in the optical axis direction of the ellipse is located on the main line P. A cross section Rs perpendicular to a projection main line Pa formed by projecting the main line P on a plane surface perpendicular to the optical axis has an arc shape.

COPYRIGHT: (C)2013,JPO&INPIT