Patent ID: 6528935
Filing Date: 2003-03-04
Classification: H01J

Abstract:
A cathode-ray tube including an envelope comprising a face panel having an approximately rectangular face portion, an approximately rectangular phosphor screen being formed on an inner surface of the face portion, and a funnel at the rear of the face panel, wherein:an outer surface of the face portion is substantially flat; the inner surface of the face portion is a curved surface convex to the outer surface; and when an axis extending approximately in parallel to a long side of the phosphor screen through a center of the inner surface is X-axis, an axis extending approximately in parallel to a short side of the phosphor screen through the center of the inner surface is Y-axis, a radius of curvature of the inner surface along the X-axis is Rx, a radius of curvature of the inner surface along the Y-axis is Ry, a radius of curvature of the inner surface along a long side of the phosphor screen is Rt, a length of a long side of the phosphor screen is H, and a length of a short side of the phosphor screen is V, the following inequalities are satisfied: 1.2H1.3923<3.00H1.4284,â€ƒâ€ƒ(1) 1.2H1.3923<3.00H1.4284,â€ƒâ€ƒ(2) and3.0V1.4670<6.67V1.5453.â€ƒâ€ƒ(3) and wherein the inner surface has no inflection point.