| 摘要 |
PURPOSE:To enable an electron emitter of long life time to be produced in a simple process, by forming a metallic film on the holes of the surface of a porous supporting body, making oxide powder for emitting electrons to stick onto said metallic film, and then heating and melting said metallic film in fluidified form. CONSTITUTION:A gold film 12 is vacuum evaporated on the surface part of a porous supporting part 10, for instance, on thin holes 10A with diameters of about 10-20mum. Oxide powder, for instance, made of barium oxide whose particle diameter is about 1-5mum is suspended in a collodion acting as a binder, and this collodion is packed into the thin holes 10A on which said film 12 has been deposited. The porous supporting body 10 of the electron emitter with such constitution is heated by a heater or the like, for instance, up to about 800 deg.C. Thereby, electrons are emitted from the oxide powder. Consequently, the electron emitter of long life time can be produced in a simple process. |
