Color picture tube

摘要

A curve (20) formed by an inner surface of a face panel (31) in a cross-section including a tube axis of a color picture tube is defined. The face panel (31) includes at least one cross-section in which the curve (20) has an inflection point (21) between a center (P0) of the face panel (31) and a circumferential edge of an effective display region (25). Assuming that a maximum value of an angle formed by a tangent (23) of the curve (20) and a plane (29) orthogonal to the tube axis between the center (P0) of the face panel (31) and the inflection point (21) is &thetas;A, and a minimum value of an angle formed by the tangent (23) of the curve (20) and the plane (29) orthogonal to the tube axis between the inflection point (21) and the circumferential edge of the effective display region is &thetas;B, the curve (20) having the inflection point (21) satisfies 0.6 ≤ &thetas;B/&thetas;A < 1.0. Because of this, a color picture tube having satisfactory screen quality can be provided. <IMAGE> <IMAGE> <IMAGE>