Diffuse surface illumination apparatus and methods

G - Physics – 06 – K

Patent

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G06K 7/10 (2006.01) G03B 15/06 (2006.01) H04N 5/222 (2006.01)

Patent

CA 2343264

An illumination apparatus (80) is provided for a hand-held imager (30) preferably to provide diffuse illumination for encoded symbology carried directly upon an article, component, etc., or upon a substrate carried by an article. The illumination apparatus (80) is disposed proximate the front of the hand-held imager (30) and is configured to permit light reflected from the target to pass through the illumination apparatus (80) and onto a CCD image receiver (60). An array of unlensed LEDs (114) is disposed to cast approximately or substantially lambertian illumination in a direction away from the target to be imaged and into the hand-held housing (32) to impinge upon surfaces of an illuminator (82) to receive the illumination and, in turn, project efficient and diffuse dark field illumination through the array of unlensed LEDs (114) and towards and onto a location where a target to be imaged would be disposed. The illumination apparatus (80) further includes a bright field illumination source (166) including a plurality of forward facing, towards the target, lensed LEDs (162).

Ce dispositif d'éclairage, qui est destiné à un imageur à main, est conçu pour assurer, de préférence, un éclairement diffus de symboles codés portés directement sur un article (composant, etc.) ou sur le substrat dont est pourvu cet article. Ce dispositif d'éclairage, qui est monté près de la partie frontale de l'imageur à main, est configuré pour se laisser traverser par la lumière réfléchie par la cible, laquelle lumière vient frapper un récepteur d'image à couplage de charge. Une mosaïque de diodes électroluminescentes sans lentilles est disposée de manière à diffuser un éclairement quasiment ou sensiblement lambertien à distance de la cible à imager ainsi que dans le boîtier de l'imageur afin que cet éclairement vienne heurter les surfaces d'un illuminateur, qui recevant cet éclairement, projette à son tour un éclairage à fond noir, efficace et diffus, par la mosaïque de diodes, vers et sur l'emplacement où se trouve la cible à imager. Ce dispositif d'éclairage comporte également une source d'éclairage à fond clair comportant plusieurs diodes électroluminescentes à lentilles orientées vers l'avant (vers la cible).

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