Laser beam scanner

G - Physics – 06 – K

Patent

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Details

G06K 7/10 (2006.01)

Patent

CA 2058669

A laser beam scanner for use in a code reader or the like including more than two optical-path-length changing units inserted in the beam path to change the optical path length of the beam between the beam emitting unit and the scanning unit such that the distance from the scanner to the focal point of the beam can be changed. The optical-path-length changing units are controlled by a control unit which receives an output from a distance measuring unit. The distance measuring unit measures the distance from the laser beam scanner to the object to be scanned and indicates to the control unit to adjust the optical-path-length so that the focal point of the beam is at the same distance as the object to be scanned.

L'invention est un dispositif de balayage à faisceau laser pour lecteur de codes à barres ou appareil similaire. Le dispositif de l'invention comporte plus de deux unités de modification de longueur de trajet optique montés sur le trajet du faisceau pour modifier la longueur du trajet optique entre l'unité émettrice du faisceau et l'unité de balayage de telle façon que la distance entre lui et le foyer du faisceau puisse être modifiée. Ces unités de modification de longueur de trajet optique sont commandées par une unité de commande qui reçoit un signal transmis par une unité de mesure de distance. Celle-ci mesure la distance entre le dispositif de balayage à faisceau laser et l'objet à balayer et indique à l'unité de commande comment ajuster la longueur du trajet optique pour que le foyer du faisceau soit à la même distance que l'objet à balayer.

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