COLLECTION OPTICS FOR LOW PROFILE SINGLE LINE SCANNING ASSEMBLY IN COMPACT BAR CODE READERS

摘要

An apparatus for reading bar code symbols having parts of different light reflectivity by a scanning beam which forms a scan line through the bar code symbol includes focusing optics for collecting light reflected off at least a portion of the bar code symbol including a front surface for receiving the incoming light, and a first surface adjacent one end of the front surface, and a second surface adjacent to the other end of the front surface, and a rear surface. A photosensor is positioned so as to receive light collected by the focusing optics and transmitted through the rear surface, and for generating an electrical signal indicative of the detected light intensity. The first and second surfaces have different light reflectivity properties.