| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a cathode, capable of providing a cathode ray tube which is capable of forming a satisfactory image, free of the change in a color tone or the like by preventing the change of the resistance value between a sleeve and a heater, and provide an electron gun having this cathode and a cathode-ray tube having this electron gun. SOLUTION: The cathode 10, which is formed by arranging a heater 4 in a sleeve 1 air tightly sealed at its one end face 1a, and mounting a cap 2 having an electron-emission substance 3 on the sealed end face 1a, the electron gun having this cathode 10, and the cathode-ray tube having this electron gun are composed.</p> |
