Patent ID: 7501748

Claim:
A Cathode Ray Tube (CRT), comprising: a panel having long and short axes and a tube axis perpendicular to the long and short axes, the panel including an inner phosphor screen; a funnel attached to the panel, the funnel including a cone having a deflection unit arranged on an outer circumference thereof; and a neck attached to the funnel and having an electron gun arranged therein; wherein the cone has a cross-section taken perpendicular to the tube axis with a shape transitioning from a circle to a non-circle having a maximum diameter along a direction other than the long and the short axes of the panel while proceeding from the neck to the panel, and with the cross-section of the cone centered on the tube axis, the inner and the outer surfaces of the cone in the directions of the long and the short axes of the panel bulging inward toward the tube axis; wherein a radius of curvature Rh of an arc determining inner and the outer surfaces of the cone in a direction of the long axis of the panel satisfies the inequality: 300 mm<Rh< ∞; wherein a radius of curvature Rv of an arc determining inner and the outer surfaces of the cone in a direction of the short axis of the panel satisfies the inequality: 650 mm<Rv< ∞ ; and wherein Rh increases while proceeding from the panel to the neck.