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.
