Cathode ray tube.

摘要

Cathode ray tube having an electron gun (23) positioned in the neck portion (2), the gun comprising a beam-shaping part and a focusing structure and the beam-shaping part comprising at least a cathode (24) and a metal electrode plate (27) provided with a central aperture, and the focusing structure comprising a hollow tube (32) 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 (22,26,27) of the beam-shaping part of the electron gun are secured via metal pins to rods (48,50,52,54) for forming an assembly. The hollow tube (32) is directly secured to the metal electrode plate (27) 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 (29) with a coaxial aperture, and the said metal plate (29) is fixedly connected to the metal electrode plate (27) of the beam-shaping part of the electron gun in such a way that their apertures are coaxial.