Cathode ray tube

摘要

A cathode ray tube includes a panel with inner and outer surfaces, a funnel connected to the panel, a neck connected to the rear of the funnel, and a shadow mask mounted within the panel. The inner surface of the panel satisfies the following condition: 0.2<=Px<=0.4, 0.3<=Py<=0.6 where when the inner surface of the panel is expressed by the following biquadratic: $z\left(x,y\right)=\sum _{i,j=0,2,4}{A}_{i,j}{x}^i{y}^j,$ based on the central point of the inner surface of the panel with the three-dimensional orthogonal coordinates system defined by the x, y and z axes, Px and Py are defined by the following formula: $\mathrm{Px}=\frac{A_{20}}{A_{20}+A_{40}},\mathrm{Py}=\frac{A_{02}}{A_{02}+A_{04}}$