Patent ID: 8686336

Claim:
A device for optical scanning, comprising: an array of photo sensors with a plurality of first photo sensors and, as a portion of said array, at least one second photo sensor located at an end of said array, where the first photo sensors are arranged to detect light incident on the photo sensors, emitted from a light source and reflected from an object subject to optical scanning; one or more units arranged at the end of the array to: transmit light received from the light source to the at least one second photo sensor; and shield the at least one second photo sensor from substantially all the light reflected from the object, so that the amount of light received at the at least one second photo sensor is: to a larger extent light transmitted from the light source; and to a smaller extent light reflected from the object, and wherein at least one of the one or more units provides that light exits the at least one unit as specularly reflected light and/or diffuse light.