Method and apparatus for defining illumination field of view of barcode reader

摘要

A method and apparatus for defining the illumination field of view of a barcode reader. The method includes (1) generating an illumination with an illumination source; (2) directing the illumination with an illumination lens to pass through an aperture to generate an illumination pattern directed toward a target object and to define an illumination field of view with the aperture; and (3) focusing light reflected from the target object onto a photosensor array with an imaging lens in an imaging system.

主权项

1. A barcode reader comprising:
an illumination source for generating an illumination; an aperture for defining an illumination field of view; an illumination lens, deposited between the illumination source and the aperture, for directing the illumination from the illumination source through the aperture to generate an illumination pattern directed toward a target object; an imaging system including a photosensor array and an imaging lens for focusing light reflected from the target object within an imaging field of view onto the photosensor array; a chassis having the aperture formed thereon; wherein the imaging lens is deposited on the chassis; and wherein a boundary surrounding the illumination pattern as defined by the aperture substantially coincides with the boundary surrounding the imaging field of view of the imaging system, with the boundary surrounding the illumination pattern having a shape that is identical to the shape of the aperture.