Imaging reader with asymmetrical magnification

摘要

A solid-state imager is mounted in a reader, such as a bi-optical, dual window, point-of-transaction workstation, for capturing light along an optical axis over a field of view from coded indicia. An optical assembly including non-rotationally symmetrical optics is operative for optically modifying and asymmetrically magnifying an image of the indicia and the field of view of the imager along mutually orthogonal directions generally perpendicular to the optical axis, and for increasing resolution of the imager along one of the directions. Preferably, the non-rotationally symmetrical optics includes a cylindrical lens having an aspherical profile along the one direction, and a planar profile along the other of the directions.

主权项

1. A reader for electro-optically reading indicia, comprising:
a housing; a solid-state imager within the housing, for capturing light along an optical axis from the indicia over a field of view; a controller for controlling the imager to produce an electrical signal indicative of the indicia being read, and for processing the electrical signal to read the indicia; an optical assembly including non-rotationally symmetrical optics for optically modifying and asymmetrically magnifying an image of the indicia and the field of view of the imager along mutually orthogonal directions generally perpendicular to the optical axis, and for increasing resolution of the imager along one of said directions; wherein the optical assembly includes rotationally symmetrical optics, together operative with the non-rotationally symmetrical optics, for projecting the light from the indicia onto the imager; and wherein the non-rotationally symmetrical optics has only one non-rotationally symmetrical optics lens positioned between the rotationally symmetrical optics and the solid-state imager, the non-rotationally symmetrical optics lens has a first surface facing the rotationally symmetrical optics and has a second surface facing the solid-state imager, with the first surface having a positive power in one of the mutually orthogonal directions and having substantially no power in the other one of the mutually orthogonal directions, and with the second surface having a negative power in said one of the mutually orthogonal directions and having substantially no power in said other one of the mutually orthogonal directions.