Patent ID: 7988513

Claim:
A manufacturing method of an electron-emitting device equipped with an electroconductive film including a gap at a part thereof, comprising the steps of: preparing a substrate including at least a first insulating portion including silicon oxide and a second insulating portion having a heat conductance higher than said first insulating portion, said second insulating portion arranged abreast of said first insulating portion, wherein said first and said second insulating portions are arranged under an electroconductive film having a resistance lower than those of said first and said second insulating portions; forming a gap at a part of the electroconductive film directly above said first insulating portion by flowing a current through said electroconductive film; providing a first electrode and a second electrode separately arranged with the gap between them and respectively connected to the electroconductive film, and locating said second insulating portion directly under at least one of the electrodes so as to comprise a common contact area.