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