Patent ID: 6268688
Filing Date: 2001-07-31
Classification: H01J

Abstract:
A color cathode ray tube comprising:an envelope including a panel having a substantially rectangular effective portion;a phosphor screen provided on an inner surface of the effective portion;a substantially rectangular shadow mask arranged opposite to the phosphor screen in the envelope, the shadow mask having a center through which a tube axis passes, and a long axis and a short axis passing through the center and perpendicular to each other; andan electron gun for emitting electron beams to the phosphor screen through the shadow mask,the shadow mask including: a substantially rectangular mask body having a main surface which is constituted by a curved surface opposite to the phosphor screen and in which a number of electron beams passage apertures are formed; and a substantially rectangular mask frame to which a peripheral portion of the mask body is attached,the mask frame having a substantially rectangular side wall portion parallel to the tube axis, anda height of the side wall portion along the tube axis at ends of the short axis being lower than a height of the side wall portion along the tube axis at ends of the long axis.