公开(公告)号：US4853584A

公开(公告)日：1989-08-01

申请号：US88155

申请日：1987-08-21

Applicant: Hirom Inoue

Inventor： Hirom Inoue

IPC: H01J9/18 ,  H01J29/48 ,  H01J29/50

CPC classification number: H01J29/503 ,  H01J29/485 ,  H01J9/18

Abstract: An electron gun with an improved structure for providing accurately adjusted cut-off voltage. A novel process for producing the improved electron gun, and maintain substantially high uniformity of cut-off voltge in production. The electron gun comprises a plurality of grid electrodes including a first electrode mounted at the closest position to a cathode. The cathode is supported by a cathode base. The cathode base and the first electrode are provided in a pre-assembled form. The pre-assembly of the cathode base and the first electrode is supported by means of a holder which is fixed to glass beads together with other grid electrodes. In assembling of the electron gun, the distance between the cathode surface of the cathode and a plane surface of the first grid electrode, where an electron beam path is defined, is precisely adjusted during formation of the pre-assembly. The holder and the grid electrodes other than the first grid electrodes are subjected to a beading process so as to mount them on the glass beads with known spacings. After the beading process, the pre-assembly of the cathode base and the first grid electrode is mounted to the holder and the distance between the first and second grid electrodes is adjusted to a given distance.

Abstract translation: 具有改进结构的电子枪，用于提供精确调节的截止电压。 一种用于生产改进的电子枪的新颖方法，并且在生产中保持基本上高的截止电压的均匀性。 电子枪包括多个栅极，其包括安装在与阴极最接近的位置的第一电极。 阴极由阴极基座支撑。 阴极基体和第一电极以预组装的形式提供。 阴极基座和第一电极的预组​​装通过与其它栅电极一起固定到玻璃珠的保持器来支撑。 在电子枪的组装中，在形成预组装期间精确地调节阴极的阴极表面与限定电子束路径的第一栅格电极的平面之间的距离。 将保持器和除第一栅格电极之外的栅电极进行珠光处理，以将它们以已知间隔安装在玻璃珠上。 在珠光处理之后，将阴极基座和第一格栅电极的预组​​装安装到保持器，并且将第一和第二栅极之间的距离调节到给定的距离。