Patent ID: 6320324
Filing Date: 2001-11-20
Classification: B82Y,H01J

Abstract:
A thin-film type electron source having a laminated structure of a lower electrode, an insulating layer and an upper electrode, for emitting electron from a surface of said upper electrode into a vacuum, upon application of voltage between said lower electrode and said upper electrode, in a polarity thereof so that said upper electrode is positive in the voltage, being characterized in that said lower electrode is made from Al-alloy adding metal into Al which can be anodized, while said insulating layer is made from anodized film which is anodized upon surface of said lower electrode, wherein a ratio of a reverse direction diode current when applying an electric field of 10 MV/cm thereacross in a reverse direction, with respect to a forward direction diode current when applying an electric field of 10 MV/cm thereacross in a forward direction so as to cause emission of electron therefrom, is equal to or greater than 0.12, when it is converted into a case where height of barrier of said insulating layer to said lower electrode is equal to that of said upper electrode.