Illumination system in imaging scanner

摘要

A barcode imaging reader includes a housing, a window in the housing, and an imaging sensor having an array of photosensitive elements for capturing light passing through the window. The barcode imaging reader further includes an illumination arrangement for emitting an illumination light from the housing interior to illuminate a barcode target object spaced from the housing. The illumination arrangement includes (i) an illumination source within the housing operative to generate the illumination light during imaging capture, (ii) a first mirror having a shape of a toroidal surface with predominantly concave surface, and (iii) a second mirror having a shape of a toroidal surface with predominantly convex surface.

主权项

1. An apparatus comprising:
a housing; a window in the housing; an illumination arrangement for emitting an illumination light from the housing interior to illuminate a barcode target object spaced from the housing; an imaging sensor having an array of photosensitive elements for capturing light scattered or reflected from the barcode target object within an imaging field of view corresponding to the imaging sensor while the barcode target object is illuminated by the illumination light having an illumination field-of-view; wherein the illumination arrangement comprising,
(i) an illumination source within the housing operative to generate the illumination light during imaging capture,(ii) a first mirror having a shape of a toroidal surface with predominantly concave surface, and(iii) a second mirror having a shape of a toroidal surface with predominantly convex surface; wherein the first mirror is located within the housing at a position generally facing the illumination source and the second mirror, and the first mirror is configured for reflecting at least a portion of the light emitted by the illumination source toward the second mirror; wherein the second mirror is located within the housing at a position generally facing the first mirror and the window, and the second mirror is configured for reflecting at least a portion of the light received from the first mirror toward the window; and wherein the illumination source is configured to emit some light directly toward the second mirror, and wherein the second mirror is configured to reflect the light directly received from the illumination source toward the window.