CATHODE-RAY TUBE

PROBLEM TO BE SOLVED: To uniformly and efficiently degauss the entire magnetic member at the time of performing degaussing by using a coil used for both degaussing coil and cancellation coil so as to sufficiently magnetize the magnetic material of a color sorting electrode or the like inside a cathode-ray tube. SOLUTION: In this cathode-ray tube composed so as to degauss the magnetic material disposed inside the cathode-ray tube 1 by the coil used for both degaussing coil and cancellation coil for electron beam track deviation correction, a gradually decreasing AC current is successively made to flow to both of pairs of the coils 14a and 14b and 13a and 3b provided on the upper, lower, left and right parts of the cathode-ray tube 1 and the magnetic material inside the cathode-ray tube 1 is magnetized.