US Patent 8152069 Dual focus imaging based symbology reading system

A dual focus imaging scanner system and method for reading symbologies such as barcodes. The scanner system includes a light source producing two discrete wavelengths of light for illuminating a symbology target, a lens assembly for collecting a reflected image of the illuminated symbology target, which image preferably comprises the first and second wavelengths of light, and a color separation filter positioned to receive the combined reflected symbology target image from the lens assembly. The filter produces a first symbology image comprised of the first wavelength of light and a separate second symbology image comprised of the second wavelength of light. A first image sensor is positioned for receiving the first image and a second image sensor is positioned for receiving the second image. Preferably, the first and second sensors each have a different local point and focal range to scan near and far symbologies.