A device for reading and interpreting bar codes, which illuminates the bar code with a fixed elliptical beam and images the reflected beam onto a CCD array. The black and white bar information is detected by the electronically scanned elements of a linear CCD array. The limited operational range, determined...http://www.google.com/patents/US5192856?utm_source=gb-gplus-sharePatent US5192856 - Auto focusing bar code reader
