Patent Number: 6,294,868

Title: Electron gun for electron tube with cold cathode

Abstract: A Wehnelt electrode and a cold cathode are pressed against and fixed to each other under spring force with a ceramic plate interposed therebetween. Metallized layers connected to a gate electrode and a focusing electrode are disposed on surfaces of the ceramic plate. The gate electrode and the focusing electrode are connected to external power supplies via the metallized layers as feeder path structures. With this arrangement, an electron gun for an electron tube with a cold cathode can be designed with increased degree of freedom, reduced in size, can easily be assembled at the time of manufacture, has high dimensional accuracy, provides high dielectric strength between gate and Wehnelt electrodes, and is highly resistant to vibrations.

Inventors: Imura; Hironori (Tokyo, JP), Seko; Nobuya (Tokyo, JP)

Assignee: NEC Corporation

International Classification: H01J 23/02 (20060101); H01J 23/06 (20060101); H01J 3/02 (20060101); H01J 3/00 (20060101); H01J 029/46 ()

Expiration Date: 09/25/2018