Apparatus providing enhanced depth of bar code reading range

G - Physics – 06 – K

Patent

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G06K 7/10 (2006.01)

Patent

CA 2164506

In order to control laser beam propagation, working range and beam cross section in a bar code scanner, diffractive optics are used to modify the amplitude and/or phase distribution of the beam in the scanner. The beam is diffracted by a mask which has a plurality of apertures in the form of segments which are arranged across the beam cross section in the vicinity of a converging lens. The segments are sized (A, a) and their transmission functions selected (one segment having for example 100 % transmission (A) and the other having 50 % transmission (a)) such that bar cedes close in (dwa1) and far out (dwa2) from the scanner are in regions of far field diffraction of different segments, or where such regions overlap, thereby extending the working range (w) of the scanner where bar codes of high density can be resolved.

Pour régler la propagation, la plage de fonctionnement et la section transversale du faisceau d'un scanneur de codes à barres, la diffraction est utilisée, afin de modifier l'amplitude et/ou la ditribution de phase de ce faisceau qui est diffracté par un masque comportant plusieurs ouvertures constituant des zones situées sur un axe transversal par rapport à ce faisceau, à proximité d'une lentille convergente. Les zones sont dimensionnées (A, a) et leurs fonctions de transmission sélectionnées (une zone assure une transmission à 100 % (A) et l'autre à 50 % (a)), de sorte que les codes à barres proches (dwa1) et éloignés (dwa2) du scanneur sont situés dans des régions couvertes par une diffraction à large champ, déterminée par les différentes zones du masque, ou à l'intersection de ces régions. La plage de fonctionnement (w) du scanner est ainsi étendue lorsque les codes à barres de haute densité peuvent être lus.

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