Patent ID: 6538369
Filing Date: 2003-03-25
Classification: H01J

Abstract:
A cathode ray tube with a central axis and a maximum deflection angle, the cathode ray tube comprising:a panel with an inner phosphor screen, the phosphor screen being substantially rectangular-shaped with four edges; a funnel connected to the panel, the funnel having a cone portion with a neck sealing side and a body portion extending from the cone portion to the panel; a deflection yoke externally mounted around the funnel; a neck connected to the neck sealing side of the cone portion of the funnel; and an electron gun mounted within the neck; wherein a meeting point between the cone portion and the body portion is an inflection point, and wherein when two lines are drawn from centers of opposite edges of the phosphor screen to an intersection point on the central axis line such that an angle between the central axis line and each of the two lines is approximately half of the tube's maximum deflection angle, a reference line is indicated by a line that is normal to the central axis line at the intersection point, and further wherein the funnel satisfies the following condition: 0.52+0.001Ã—(&agr;/2+&PHgr;)<b/a<0.74+0.001Ã—(&agr;/2+&PHgr;) where a indicates the distance on the central axis line between the reference line and a line normal to the central axis line that passes through the inflection point, b indicates the distance between the reference line and the neck sealing side of the cone portion on the central axis line, &agr; indicates a deflection angle, and &PHgr; indicates a diameter of the neck.