COLD CATHODE ELECTRON SOURCE, AND ELECTRON TUBE USING THE SAME

摘要

A cold cathode electron source (2) comprises a central conductor (3) having an end face (9) and an electron emission layer (10) formed on the end face (9) and made of an electron emission material, and an external conductor (4) having a hollow portion (12) capable of inserting the central conductor (3) in a direction normal to the end face (9), and an aperture (14) opened to the hollow portion (12). The central conductor (3) is fitted in the external conductor (4) and abuts against the external conductor (4) in the fitted direction, whereby the central conductor (3) is positioned with respect to the external conductor (4) in the direction normal to the end face (9) and exposes the surface of the electron emission layer (10) from the aperture (14). Stable fabrications of electron sources of identical characteristics having an adjusted electron emission can be easily realized according to the cold cathode electron source.