Patent ID: 6023059
Filing Date: 2000-02-08
Classification: G02B

Abstract:
A dual format pre-objective scanner comprisinga polygon tower comprised of a first polygon having a first diameter and a first number of facets and a second polygon having a second diameter and a second number of facets, said polygon tower mounted for rotation on an axis common to said first and second polygon;a light source producing a beam of light incident on said polygon tower;a scan lens for receiving light from said polygon tower; andwherein said polygon tower is moved in a direction parallel to said axis of rotation to shift a point of contact of said incident beam between said first polygon and said second polygon and said polygon tower is moved in a lateral direction, simultaneously with said movement in said parallel direction, in a plane approximately perpendicular to said axis of rotation so that a first distance between said first polygon and said scan lens when said beam of light is incident on said first polygon is approximately equal to a second distance between said second polygon and said scan lens when said beam of light is incident on said second polygon.