Opto-electronic device for acquisition of flat images, in particular of barcodes

摘要

A laser diode (4) fitted within a ring (5) emits light which is reflected by a mirror (7) on to a facet (8a) of a polygon mirror (8). The mirror is driven by a step motor (9) having an adjustable initial angle of rotation and causes incident light to make a series of sweeps over a bar code. An electronic card synchronizes the sweeps with clock signals and light from the laser light spot is received by a collector (10) and photodiode (13)