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