means for directing {HEAD ~ the incoherent light beam} into {TAIL ~ a plurality} of adjacent incoherent light beams which form a continuous line of illumination across a portion of an output surface, 
means for directing { HEAD ~ the incoherent light beam } into { TAIL ~ a plurality } of adjacent incoherent light beams which form a continuous line of illumination across a portion of an output surface ,
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH