Lesegerät für Datensymbole

摘要

A data symbol reading device includes a zoom lens system (46). During a reading process, if the reading of the data symbol is unsuccessful, the magnification of the zoom lens is increased one step at a time from an initial minimum magnification setting until the data symbol can be read successfully. Alternatively, the magnification of the zoom lens is initially set at a maximum magnification, and then if the reading of the data symbol is unsuccessful, is decreased one step at a time from the maximum magnification.