Item Sensing in a Bar-Code Scanner Without Item-Sensing Rails
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
This article describes a bar-code scanner design concept that allows the scanner to sense the presence of an item approaching the read zone of the scanner without requiring the item-sensing rails that are normally used for this purpose. The scanner can then turn on the scanning beam to read the bar code on the item and turn off the scanning beam after the code has been read. The concept combines the advantages of the use of item sensing (lower laser product classification, longer laser life, less customer annoyance) with the advantages of the rail- free, flatbed design (smooth scan surface, fewer parts, lower maintenance).