The conductive film 9 functions as a switch for controlling the amount of {HEAD ~ electrons} emitted from {TAIL ~ the field emission tip} 6 
The conductive film 9 functions as a switch for controlling the amount of { HEAD ~ electrons } emitted from { TAIL ~ the field emission tip } 6
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH