Apparatus for and method of minimizing specular reflections in imaging field of view of workstation that reads targets by image capture

摘要

A workstation electro-optically reads targets by image capture, and includes a housing, a generally planar window, an imaging module, and a generally planar fold mirror between the window and the module. The module has an illuminating light assembly for directing illumination light along an illumination path through the window at a target for return therefrom during reading, and an image sensing assembly for detecting return illumination light through the window along an imaging path over an imaging field of view during reading. The fold mirror folds the illumination and the imaging paths. The fold mirror and the window lie in planes that are substantially parallel to each other to prevent reflections of the illumination light off of the fold mirror and the window from entering the imaging field of view as virtual images that degrade target detection by the image sensing assembly.

主权项

1. A workstation for electro-optically reading targets by image capture, comprising:
a housing for supporting a light-transmissive window; an imaging module mounted in the housing, the imaging module including an illuminating light assembly for directing illumination light along an illumination path in the housing through the window at a target for return therefrom during reading, and an image sensing assembly for detecting return illumination light returning from the target through the window along an imaging path in the housing over an imaging field of view during reading; a fold mirror mounted in the illumination and the imaging paths in the housing between the window and the imaging module, and operative for folding the illumination and the imaging paths, the fold mirror lying in a plane and facing the window, and the window lying in a plane and oriented relative to the plane of the fold mirror to prevent reflections of the illumination light off of the fold mirror and the window from entering the imaging field of view as virtual images that degrade target detection by the image sensing assembly; and wherein the plane of the window is oriented in a range of plus or minus 10 degrees out of exact parallelism with the plane of the fold mirror.