Patent ID: 7012359

Claim:
A color cathode-ray tube comprising: an envelope including a substantially rectangular panel with a substantially flat outer surface, and a funnel coupled to the panel; a phosphor screen that is formed on an inner surface of the panel; an electron gun assembly that is disposed within the envelope and configured to emit an electron beam toward the phosphor screen; a shadow mask including a mask body that is disposed to face the phosphor screen and has a number of electron beam passage holes, and a mask frame that supports a peripheral part of the mask body; and a deflection yoke configured to generate a deflection magnetic field that deflects the electron beam emitted from the electron gun assembly, wherein the envelope has a tube axis that passes through a central part of the panel and a center of the electron gun assembly, a horizontal axis that intersects at right angles with the tube axis, and a vertical axis that intersects at right angles with the tube axis and the horizontal axis, at least a pair of magnets are disposed on a horizontal axis of that part of the deflection yoke, which is located on the phosphor screen side, and the mask body satisfies the following conditions, ( Z MD −Z MH )/ L MS ≧0.020, and 0.065 ≦Z MD /L MD ≦0.095 where in a substantially rectangular effective region with a predetermined curvature of the mask body, L MD is a distance between a central part and a diagonal-axis end of the effective region, L MS is a distance between a horizontal-axis end and the diagonal-axis end of the effective region, Z MD is a height difference between the central part and the diagonal-axis end in a direction of the tube axis, and Z MH is a height difference between the central part and the horizontal-axis end in the direction of the tube axis.