DIFFUSE BRIGHT FIELD ILLUMINATION SYSTEM FOR A BARCODE READER

摘要

One aspect of the present disclosure is related to a barcode reader that includes a bright field illumination system, a dark field illumination system, and an additional illumination system that is better able to illuminate an area of the reader's field of view between the far zone (where bright field illumination is optimal) and the close zone (where dark field illumination is optimal). In this “center zone,” the dark field illumination may not be bright enough and the bright field illumination may not be diffuse enough for reading a barcode.

主权项

1. A barcode reader with three distinct illumination systems, comprising:
a bright field illumination system that directs bright field illumination into a field of view of the barcode reader substantially parallel to an optical axis of the barcode reader, wherein the bright field illumination is optimal for barcode reading within a far zone of the field of view; a dark field illumination system that directs dark field illumination into the field of view at a non-zero angle relative to a plane that is perpendicular to the optical axis, wherein the dark field illumination is optimal for barcode reading within a close zone of the field of view, the close zone of the field of view being closer to the reader than the far zone of the field of view and separated from the far zone of the field of view by at least a portion of a center zone; and a diffuse bright field illumination system that directs diffuse bright field illumination into the field of view substantially parallel to the optical axis, wherein the diffuse bright field illumination is diffused with an intensity distribution of illumination within the center zone of the field of view that is more even than the intensity distribution of illumination from the bright field illumination system.