Patent ID: 6752318
Filing Date: 2004-06-22
Classification: G06K

Abstract:
An optical symbol reading device comprising:a) an image data input section including: 1) a front surface symbol reading device and back surface symbol reading device, 2) an image data input unit for receiving a bar code label, characters, symbols, or image data on an article that is moved by a conveyor, and 3) an image data input focus point modifier; b) an article detector for detecting that said article has entered a read zone; c) an interpreter for converting electric signals from said image data input section to electronic signals representative of at least one of numbers and characters as interpretation results; d) an interpretation result output section for outputting the interpretation results of said interpreter to an external device; e) a front surface/back surface position detector for continuously detecting a position on said conveyor of both a front surface and a back surface of an article as said article is moved by said conveyor to provide data indicative of continuously changing positions of said article; and f) an image data input focus point control section for outputting data from said front surface/back surface position detector to said image data input focus point modifier, said image data input focus point modifier continuously adjusting the focus point of said front surface reading device and said back surface reading device based on said data from said front surface/back surface position detector, said continuous adjusting being made without time delay based on conveyor speed.