Patent ID: 6885141

Claim:
A cathode ray tube comprising: a panel; a funnel engaged to the panel for forming a vacuous space; and a shadow mask supported in the cathode ray tube by being fixed to a mask frame and including an effective surface having a plurality of electron beam passing holes at a center thereof, an ineffective surface formed at a periphery of the effective surface and not having the electron beam passing holes and a skirt portion extended from the ineffective surface and welded to the mask frame, wherein the skirt portion of the shadow mask includes a slot formed between at least two welding points by which the skirt portion is welded to the mask frame, and a plurality of notches formed at peripheries of the welding points; a height of the slot from an end side of the skirt portion is higher than that of the welding point; and a ratio of a width Ws of the slot to a distance Wn between the notches satisfies a formula of 0.22≦Ws/Wn≦0.57.