| 摘要 |
<p>The apparatus of this invention enables optical codes to be read on objects carried on a supporting plane which is provided with a means for moving the objects along a feeding direction. The apparatus comprises: a laser beam scanner emitting modulated light; a data processing unit connected to the scanner; a first scan means for generating at least a first scan in a first scan plane, so as to measure the instantaneous distance of at least one point on the surface of each of said objects from the scanner; a second scan means for generating a plurality of second scans in a second scan plane, different from the first, so as to read the optical code on the object; a means for adjusting the laser beam focal setting according to the distance measured with the first scan. <IMAGE></p> |
