Colour TV CRT with triple electron gun system - has second correction deflection system between main and first correction systems with opposite effect

摘要

At least two electron guns of the triple system (3, 4, 5) are mounted outside the tube long axis. In front of the phosphor screen is mounted in a shadow mask (2). The three electron beams are treated by a main deflection system in two mutually orthogonal deflection direction. A correction deflection device is effective in one plane only and effects a predeflection of at least one electron beam. Between this correction deflection device and the main deflection system is provided a second correction deflection device, also effective in one plane only. The deflection direction of the two correction devices are in opposite senses. The predeflection capacity for the two non-axial electron beams are adjustable as to provide in the region of the main deflection system the desired direction and spacing from the tube axis.