Lateral magnetic shielding for color CRT

摘要

Color cathode-ray tube comprising a color selection mask ( 16 ) held under tension between a first pair of opposed long sides ( 30 ) of an approximately rectangular metal frame ( 21 ), a main magnetic screen ( 22 ) placed at the rear of the frame in the funnel-shaped part ( 11 ) of the tube's envelope, and additional means ( 50 ) for forming a screen against the Earth's magnetic field in the part lying along the second pair of opposed short sides of the frame.