| 摘要 |
PURPOSE:To obtain a cathode-ray tube with excellent high quality by raising a heater voltage than the rated value in the initial stages of raster aging process. CONSTITUTION:After applying a voltage Ef1 which is 1.1 to 1.2 times the rated voltage to the heater 9a-9c, the rated voltage or a voltage Ef2 which is lower than such rated voltage is applied during about 1/3 from the beginning of total period of the raster eging process 104. The first application of a voltage Ef1 which is higher than the rated voltage is necessary to recover the electron radiation capability deteriorated because impurity gas generated in the spot knoking process 103 adheres to the cathodes 10a-10c. The successive application of rated voltage or a voltage Ef2 which is lower than rated voltage is carried out to prevent that the electron radiation capability of cathode is remarkably deteriorated if the oxidation gas and halogen gas enter the inside of color picture tube and to enhance the capability of detecting impurity gas entering the inside of picture tube because the cathode, when it is low in temperature, is easily influenced by the effect of impurity gas. Thereby, a cathode-ray tube having excellent high quality by receiving electron radiation capability can be obtained. |
