Optimal symbology illumination-apparatus and method

Details Optimal symbology illumination-apparatus and method Optimal symbology illumination-apparatus and method

G - Physics

06

K

G06K 9/20 (2006.01) G06K 9/18 (2006.01) G06K 9/22 (2006.01)

Patent

CA 2404153

An imager (30) for illuminating and imaging encoded symbology to facilitate decoding of the symbology and which provides both "bright field" and "dark field" illumination patterns is provided with an illumination directing device to direct the "bright field" illumination pattern into an alternative "dark field" illumination pattern. In one embodiment the illumination directing device takes the configuration of a disc that is selectively positionable in front of the imager (30) and removable therefrom depending upon whether or not the illumination pattern is to be changed. The disc snap fits into a position at the front of the imager housing (32) and includes a fresnel configured outer ring, a light blocking inner ring, and a light transmissive center. The fresnel configuration (520) receives light and redirects the light forward of the imager and towards a centerline passing through the device to provide the alternative illumination pattern.

L'invention concerne un imageur (30) conçu pour illuminer et mettre en images une symbologie codée, qui permet le décodage de cette dernière et qui fournit des motifs d'éclairage de <= champ clair >= et de <= champ obscur >=. L'imageur est associé à un dispositifde direction conçu pour diriger le motif d'éclairage de <= champ clair >= en un motif d'éclairage alternatif de <= champ obscur >=. Dans un mode de réalisation, le dispositif de direction d'éclairage a la configuration d'un disque qui peut être sélectivement placé devant l'imageur (30) et déplacé de sa position selon si le motif d'éclairage doit être modifié. L'agraffe du disque est positionnée devant le boîtier de l'imageur (32) et comprend un anneau extérieur à configuration de Fresnel, un anneau intérieur bloquant la lumière et un centre transmettant la lumière. La configuration de Fresnel (520) reçoit la lumière et la dirige à l'avant de l'imageur, vers une ligne centrale traversant le dispositif pour fournir le motif d'éclairage alternatif.

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