Patent ID: 6608645
Filing Date: 2003-08-19
Classification: H01J

Abstract:
A funnel for a cathode ray tube comprising:a yoke portion at a smaller open-end side and a body portion at a larger open-end side, an arbitrary transverse cross-section (Ph) perpendicular to a center line X of said body portion being substantially rectangular having a major axis L, a minor axis S and a diagonal axis D, wherein, with said transverse cross-section (Ph) being virtually divided into four 90Â°-quadrants around said center line X, a thickness distribution at least in one of said quadrants is provided by |T(Dh)âˆ’T(Lh)|&lE;0.3 mm and T(Dh)>T(Sh), |T(&thgr;h)âˆ’T(Lh)|0.3 mm and |T(&thgr;h)âˆ’T(Dh) |&lE;0.3 mm in a 0Â°&lE;&thgr;&lE;dÂ° region, and |T(&thgr;h)âˆ’T(Sh)|&lE;0.3 mm in a (d+&agr;)Â°&lE;&thgr;&lE;90Â° region where 0Â°where &thgr;(0Â°&lE;&thgr;&lE;90Â°) is an angle measured from said major axis L in each quadrant, T(Lh) is a thickness of a region on said major axis L (&thgr;=0Â°), T(Sh) is a thickness of a region on said minor axis S (&thgr;=90Â°), T(Dh) is a thickness of a region on said diagonal axis D(&thgr;=dÂ°), and T(&thgr;h) is a thickness of a region at an arbitrary angle (&thgr;).