公开(公告)号：US4978886A

公开(公告)日：1990-12-18

申请号：US207524

申请日：1988-06-16

申请人： Satoru Miyamoto ,  Yoshiaki Takahashi ,  Katsuyuki Shirai ,  Ikuya Takahara ,  Satoru Endo

发明人： Satoru Miyamoto ,  Yoshiaki Takahashi ,  Katsuyuki Shirai ,  Ikuya Takahara ,  Satoru Endo

IPC分类号： H01J29/48 ,  H01J29/50

CPC分类号： H01J29/503 ,  H01J2229/4868 ,  H01J2229/4872 ,  H01J2229/4875

摘要： At least one of grid electrodes which serves as a main lens of an electron gun for use in a color cathode ray tube is divided into a plurality of cylindrical electrodes coaxially connected. An inner electrode is provided at the connection part between the cylindrical electrodes so that the center of an elliptical aperture of the inner electrode coincides with the center of an inner wall of the grid electrode. Thus, astigmatism in the main lens is removed, thereby improving the resolution of the color cathode ray tube.

摘要翻译： 用作彩色阴极射线管中使用的电子枪的主透镜的栅极中的至少一个被分成多个同轴连接的圆柱形电极。 内部电极设置在圆柱形电极之间的连接部分处，使得内部电极的椭圆形孔的中心与栅格电极的内壁的中心重合。 因此，去除主透镜中的像散，从而提高彩色阴极射线管的分辨率。