| 摘要 |
PURPOSE:To suppress a change in the electron emission characteristics resulting from the oxide layer shrinkage of an oxide cathode generated when a cathode- ray tube with the oxide cathode is operated for a long period of time by heating and processing the oxide cathode at preset temperature for a fixed period of time in the exhaust activation process of the cathode-ray tube provided with the oxide cathode. CONSTITUTION:In the exhaust activation process of a cathode-ray tube provided with an oxide cathode, an oxide layer is held for 2+ or -0.5 minutes at a brightness temperature of 1050+ or -25 deg.C. As a result, a cathode-ray tube with the good performance can be obtained with regard to the degree of void of the needle-shaped particle layer in the oxide of the oxide cathode from view of proper balance between electron emission characteristics, and the exfoliation characteristics of the oxide layer and the like. In addition, the oxide layer of the oxide cathode is hardly shrunk while the cathode-ray tube is operating for a long period of time. Consequently, the variation of the electron emission control characteristics of the cathode-ray tube can be reduced and the characteristics of the cathode-ray tube can be stabilized. |
