MODULE OR ARRANGEMENT FOR, AND METHOD OF, UNIFORMLY AND EFFICIENTLY ILLUMINATING A TARGET BY GENERATING AN ILLUMINATION PATTERN THAT IS SUBSTANTIALLY CONGRUENT TO AND OVERLAPS A FIELD OF VIEW OF AN IMAGING READER

摘要

An illumination light source emits illumination light toward a target to be read by image capture. An imaging assembly captures the illumination light returning from the target along an imaging axis over a field of view that extends along mutually orthogonal, first and second directions that are generally perpendicular to the imaging axis. A compound parabolic reflector receives, and optically modifies, the emitted illumination light to generate a generally uniform illumination light pattern that is substantially congruent to, and substantially overlaps, the field of view along both of the first and second directions. The compound parabolic reflector has first and second pairs of parabolic segments for respectively reflecting the emitted illumination light over first and second illumination angles along the first and second directions.