CATHODE RAY TUBE AND PICTURE DISPLAY DEVICE

摘要

The invention relates to a cathode ray tube (CRT) having an electron gun (1), which is provided with a beam-forming part (20) for forming an electron beam (EBR, EBG, EBB). The electron beam is imaged onto a display screen (3) by means of the electron gun (1) and deflection means (2). In operation, the deflection means (2) deflect the electron beam (EBR, EBG, EBB) towards any position on the display screen (3), thereby constituting a deflection lens (2'), the lens strength of which varies with the deflection angle. The electron gun (1) is further provided with an electron lens (30) near the beam-forming part (20), for forming the electron beam (EBR, EBG, EBB) into a crossover (10R, 10G, 10B) in the vertical direction. Said crossover is shiftable along the gun axis (MA) so as to compensate for the varying power of the deflection lens (2'). The crossover (10R, 10G, 10B) may be located anywhere between the electron lens (30) and the deflection means (2). This is particularly advantageous for large deflection angles, such as angles of 120 degrees or more.