| 摘要 |
PURPOSE: A CRT(Cathode Ray Tube) is provided to reduce deflected power while preventing electronic beam from generating BSN(Beam Shadow Neck). CONSTITUTION: An electronic gun(7) is inserted to a neck(50a) in a funnel(5) to generate electronic beam. A cone unit(50c) having a neck seal surface(50b) connected to the neck is arranged on front direction of the neck. Moreover, a body(50d) connected to a panel(3) is arranged between the cone unit and the panel. A mean variable ratio(R) of h for 25% of entire length(L) from a start point(0) is larger than 0.26 and smaller than 0.43. Herein, h is vertical distance from a tube axis(Z) to external circumference of the cone unit. L is the entire length of the cone unit established on the tube axis of CRT. 0 is an end of neck side of the cone unit.
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