SYMBOLOGY IMAGING AND READING APPARATUS AND METHOD

摘要

A hand-held imager (10) which is capable of reading both linear and two dimensional symbologist, which can perform focusing and illuminating steps quickly and accurately so as to eliminate variation in th e position of the imager (10) relative to the code becoming a negative factor, in which can operate in environment where the imager (10) i s anywhere from 1.5 inches to 16 inches from the code. The imager (10) includes an imaging system having a focusing system, an illumination system (82), and a two-dimensional photodetector (93) which forms an image of the coded symbology. After achieving targeting of th e coded symbology, the scanning system adjusts the focus between multiple different focuses, and utilizes a portion of the two- dimensional photodetector (93) to determine the optimum focus.