A single columnar array of scanning diodes is used to make width measurements of bar codes in order to read the contents thereof. The bar code is scanned utilizing a scanning procedure which directs the columnar array along the bar code such that the photo elements on the scanning array lie along an...http://www.google.fr/patents/US4411016?utm_source=gb-gplus-shareBrevet US4411016 - Barcode width measurement system
