Electron gun for cathode ray tube

An electron gun for a cathode ray tube, the electron gun comprising:

• a single cathode emitting electrons;
• first and second grid electrodes forming a triode portion with said cathode;
• a third grid electrode;
• a fourth grid electrode receiving a focus voltage, said third grid electrode being disposed between said cathode and said fourth grid electrode, said fourth grid electrode including an input section and an output section, the input section being disposed between the output section and said third grid electrode, the output section of said fourth grid electrode having an edge facing away from said cathode;
• a fifth grid electrode receiving an anode voltage, said fifth grid electrode encircling a portion of said fourth grid electrode, at least a part of the output section of said fourth grid electrode being not encircled by said fifth grid electrode, said fifth grid electrode being spaced apart from said fourth grid electrode by a predetermined gap, said fifth grid electrode including an input section and an output section, the output section of said fifth grid electrode having an edge facing away from said cathode;
• and
• a connector electrically connecting said third and fifth grid electrodes, the edge of said fourth grid electrode being a first distance from said cathode, the edge of said fifth grid electrode being a second distance from said cathode, the first distance being larger than the second distance.

An electron gun for a cathode ray tube, the electron gun comprising:

• a cathode emitting electrons;
• a first electrode having an input section and an output section, an input end of the input section of said first electrode separating said cathode from an output end of the output section of said first electrode, said first electrode having a focus voltage applied;
• and
• a second electrode having an input section and an output section, an input end of the input section of said second electrode separating said cathode from an output end of the output section of said second electrode, said second electrode having an anode voltage applied, a distance between said cathode and the output end of the output section of said first electrode being greater than a distance between said cathode and the output end of the output section of said second electrode, said second electrode encircling a portion of said first electrode, at least a part of the output section of said first electrode being not encircled by said second electrode, said second electrode being spaced apart from said first electrode by a predetermined gap.

A method of operating an electron gun for a cathode ray tube, the method comprising:

• emitting electrons from a cathode;
• applying a focus voltage to a first electrode of the electron gun, the first electrode having an input section and an output section, an input end of the input section of the first electrode separating the cathode from an output end of the output section of the first electrode;
• and
• applying an anode voltage to a second electrode of the electron gun, the second electrode having an input section and an output section, an input end of the input section of the second electrode separating the cathode from an output end of the output section of the second electrode, a distance between the cathode and the output end of the output section of the first electrode being greater than a distance between the cathode and the output end of the output section of the second electrode, said second electrode encircling a portion of said first electrode, at least a part of the output section of said first electrode being not encircled by said second electrode, said second electrode being spaced apart from said first electrode by a predetermined gap.