公开(公告)号：US4945283A

公开(公告)日：1990-07-31

申请号：US301001

申请日：1989-01-23

申请人： Antonius W. F. Van Der Heijden ,  Gerardus J. Hellings ,  Erich E. Himmelbauer ,  Tjerk G. Spanjer ,  Gerardus A. H. M. Vrijssen

发明人： Antonius W. F. Van Der Heijden ,  Gerardus J. Hellings ,  Erich E. Himmelbauer ,  Tjerk G. Spanjer ,  Gerardus A. H. M. Vrijssen

IPC分类号： H01J29/48 ,  H01J29/50 ,  H01J29/82

CPC分类号： H01J29/485 ,  H01J2229/4827

摘要： Cathode ray tube having an electron gun positioned in the neck portion, the gun comprising a beam-forming part and a focusing structure and the beam-forming part comprising at least a cathode and a metal electrode plate provided with a central aperture, and the focusing structure comprising a hollow tube of an electrically insulating material with inner and outer surfaces and with a layer of high-ohmic resistive material on at least one of the surfaces. The electrodes of the beam-forming part of the electron gun are secured via metal pins to rods for forming an assembly. The hollow tube is directly secured to the metal electrode plate for the purpose of correct alignment. The tube has a first and a second end face, the first end face in one embodiment having a metal plate with a coaxial aperture, and the said metal plate is fixedly connected to the metal electrode plate of the beam-shaping part of the electron gun in such a way that their apertures are coaxial.