Patent ID: 7967210
Filing Date: 2011-06-28
Classification: G06K

Abstract:
1. A barcode reader for imaging a target comprising: an imaging system that includes a light monitoring pixel array for converting light reflected from the target into electrical signals; an optical system having one or more focusing lenses positioned with respect to the pixel array to transmit an image of the target toward said pixel array; an illumination system comprising a light source for illuminating the target within a field of view defined by the optical system; a lens having a first surface facing the light source and a second surface facing the target for bending the light emitted by the light source to more uniformly illuminate the target within the barcode reader's field of view; wherein one of the first and second surfaces of the lens is a generally rotationally symmetric polynomial about a lens centerline that intersects the light source; and wherein the other one of the first and second surfaces of the lens is a generally non-rotationally symmetric polynomial about the lens centerline and is substantially symmetric with respect to at least two reflection planes that are perpendicular to each other.