Waveguide array-based image sensor for document scanner scan head

摘要

A scan head that comprises an elongate light source, an elongate light sensor array and a planar waveguide array The light source is disposed perpendicular to the scan direction. The light sensor array is disposed parallel to the light source. The planar waveguide array includes an input end and an output end, and is curved about an axis parallel to the light source. The input end is located to receive light from the light source reflected by the object. The output end is located adjacent the light sensor array. The waveguide array includes tapered waveguides linearly arrayed in an array direction parallel to the light source. Each of the waveguides has a width in the array direction that decreases towards the output end of the waveguide array.