The imaging lens 18 can be a graded index fiber lens or a conventional spherical lens, in which case the sensor 20 could be shorter than {HEAD ~ the length} of {TAIL ~ the scan line} 16 
of
The imaging lens 18 can be a graded index fiber lens or a conventional spherical lens , in which case the sensor 20 could be shorter than { HEAD ~ the length } of { TAIL ~ the scan line } 16
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH