The optical touch device 1, wherein the second surface of {HEAD ~ the mirror light guide component} is either a curve surface or {TAIL ~ a flat surface} 
The optical touch device 1 , wherein the second surface of { HEAD ~ the mirror light guide component } is either a curve surface or { TAIL ~ a flat surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL