Barcode-reading device and machine including such a device for automated analysis of a sample

A bar code reader device (10) comprising a bar code reader apparatus (12) having:

• a) a light emitter system (14) having an incident light source (16) capable of emitting incident light towards a useful illuminated zone;
• b) a light recovery system (28) having a reflected light conditioning system (30) and capable of recovering light reflected from a useful viewing zone and through the reflected light conditioning system (30);
• and
• c) a photoelectric sensor (26) for converting the reflected light recovered through the reflect light conditioning system (30) into an electrical signal representative of the recovered reflected light;
• the device (10) being characterized in that it includes an auxiliary optical system (36) that is arranged permanently in the working viewing zone at a distance from the sensor (26) and in series with the reflected light conditioning system (30) in such a manner that a fraction but not all of the useful viewing zone is intercepted by the auxiliary optical system (36).