| 摘要 |
PURPOSE:To quicken the starting time of flashing a getter in an electron tube to raise the degree of vacuum and thereby secure a high-grade cathode-ray tube while conforming the central position of the getter to the center axis of a getter heating coil. CONSTITUTION:The central position of a getter 18 bearing magnetism is detected by a magnetic sensor 21, and a signal out of the magnetic sensor 21 is transmitted to a driving part 23 via a magnetization measuring instrument 22, rotating and driving a cathode-ray tube by the driving part 23, and after the central position of the getter 18 is conformed to a center axis 20 of a heating coil 19, the magnetic sensor 21 is taken off and the getter heating coil 19 is shifted toward an arrow 25. After that, a high frequency current is made to flow into the heating coil 19 and the getter 18 is flashed to heighten the degree of vacuum. Centering the axis like this, the starting time of getter flashing is accelerated and, what is better, barium, one of the substances comprising the getter, increases in quantity whereby the quality of the cathode-ray tube can be improved. |
