| 摘要 |
PURPOSE:To prevent the breakdown of a filament by fixing two screws on the diagonal line of an underboard while penetrating through the corresponding hole of an upperboard while fastening two screws on the other diagonal line thereby reducing the vibration to be transmitted from the upperboard to the lowerboard. CONSTITUTION:When securing an upperboard 61 and a lowerboard 71 constituting a magnetic circuit, two screws 81, 82 on the diagonal line of the lowerboard 71 are secured through the caulking or the burrying and penetrated through the corresponding hole 61a of the upperboard 61. A hole 71a is provided on the other diagonal line of the lowerboard 71 while a tap hole 61b is provided through the corresponding upperboard 61 and fastened by means of the screws 83, 84. In other word the fastening of the upperboard 61 and the lowerboard 71 is performed only at two points. Consequently the transmission of the vibration from the upperboard 61 to the lowerboard 71 is reduced to prevent the breakdown of the cathode section filament. |
