Candidate Tracking System
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
Means are provided to effectively track a label across an optical bar code scanning system. Scanners are commonly used with processor-controlled point-of-sale systems in retail stores and supermarkets to identify goods being processed. A bar code label on an item provides input data which can be used by the system to retrieve price data, print customer receipts and update inventory records. In a fixed head scanner system, an item 1 (Fig. 1) to be detected is moved across a transparent scan window, normally in the upper surface of a stationary scanner. Optical elements 2 and 3 within the scanner deflect a laser beam to produce scan lines 4 which sweep through a volume above the scan window. Light reflected from an object passing through the volume is detected.