To reduce the size and weight of a component to be used for converging reflected light by generating the scanning motion of a light beam.

A first module provided with a laser for emitting a laser light beam and a photodiode for sensing light reflected from a bar code symbol is attached to a support independently away from a second support provided with a movable reflector and a driving device for moving the reflector. The reflector is attached on a pair of tension elements comprising a permanent loop advantageously for enabling to vibrate.