Patent ID: 6717347
Filing Date: 2004-04-06
Classification: H01J

Abstract:
A funnel-and-neck sealing body for projection tube, comprising:a funnel having a substantially rectangular large opening to which a panel for projection tube is sealed, and a circular small opening; and a neck tube of substantially a cylindrical shape sealed to the small opening of the funnel, wherein the neck tube has an electron gun installing region for installing an electron gun therein, and a yoke mounting region for mounting a deflection yoke externally thereon, and wherein an outer diameter of the yoke mounting region is smaller than an outer diameter of the electron gun installing region; and wherein relationships of 2&lE;L/L1&lE;10 and 5&lE;/L2, are satisfied, where a length in a tube axis direction of the yoke mounting region is L1, a length in the tube axis direction of a connection region between the yoke mounting region and the electron gun installing region is L2, and a total length in the tube axis direction of the neck tube is L.