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.

主权项

1. An imaging module for illuminating a target to be read by image capture, comprising:
an illumination light source for emitting illumination light toward the target for reflection and scattering therefrom; an imaging assembly having a two-dimensional array of image sensors for capturing the illumination light returning from the target along an imaging axis over a field of view that extends along first and second extents along mutually orthogonal, first and second directions that are generally perpendicular to the imaging axis; and a compound parabolic reflector for receiving, and for optically modifying, the illumination light emitted from the illumination light source 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 having a first pair of parabolic segments for reflecting the emitted illumination light over a first illumination angle along the first direction, and a second pair of parabolic segments for reflecting the emitted illumination light over a second illumination angle along the second direction.