Opto-electronic scale-reading apparatus

摘要: Opto-electronic scale reading apparatus comprising a read head (10) in which plurality of optical emitter and receiver pairs (15, 25) are arranged so that beams (13) collimated light generated by the respective emitters (15) fall on common region (30) (11). Compared to arrangements where separate regions scale, according invention is relatively immune effects certain misalignments between (11) (10).